import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:lucide_icons_flutter/lucide_icons.dart';
import 'package:image_picker/image_picker.dart';
import 'dart:io';
import 'package:dio/dio.dart';
import '../../../core/network/dio_client.dart';
import 'package:intl/intl.dart';
import '../../../core/widgets/premium_text_field.dart';
import '../../../core/widgets/smart_search_dropdown.dart';
import '../../../core/widgets/barcode_scanner_screen.dart';
import '../../inventory/providers/products_provider.dart';
import '../../inventory/providers/product_categories_provider.dart';
import '../../inventory/providers/commodity_rates_provider.dart';
import '../../inventory/providers/inventory_items_provider.dart';
import '../../inventory/providers/uoms_provider.dart';
import '../../inventory/domain/product.dart';
import '../../inventory/domain/inventory_item.dart';
import '../providers/customers_provider.dart';
import '../providers/invoices_provider.dart';
import '../domain/customer.dart';
import '../domain/invoice.dart';
import '../providers/sales_channels_provider.dart';
import '../../business/providers/business_provider.dart';
import '../../business/providers/indian_states_provider.dart';
import '../../transactions/providers/providers.dart';
import '../../transactions/presentation/widgets/attachment_gallery_screen.dart';
import 'widgets/quick_add_customer_sheet.dart';
import '../../../core/utils/purity_utils.dart';
import 'invoice_details_screen.dart';

bool _isCommodityProduct({
  ProductCategory? category,
  Product? product,
  InventoryItem? inventoryItem,
  InvoiceItem? invoiceItem,
  String? commodityCode,
  String? huid,
}) {
  final h = huid ?? invoiceItem?.huid ?? inventoryItem?.huid;
  if (h != null && h.trim().isNotEmpty) return true;

  final code = commodityCode ??
      category?.commodityCode ??
      invoiceItem?.commodityCode;
  if (code != null && code.trim().isNotEmpty && code.trim().toUpperCase() != 'NONE') {
    return true;
  }

  return false;
}

String _resolveProductUnit({
  required Product? product,
  required ProductCategory? category,
  required List<UnitOfMeasure> uoms,
  bool isCommodity = false,
}) {
  if (isCommodity) {
    return (category != null && category.baseUnit.isNotEmpty) ? category.baseUnit : 'g';
  }
  if (product?.uomId != null) {
    final uom = uoms.where((u) => u.id == product!.uomId).firstOrNull;
    if (uom != null && uom.abbreviation != null && uom.abbreviation!.isNotEmpty) return uom.abbreviation!;
    if (uom != null && uom.name.isNotEmpty) return uom.name;
  }
  if (category != null && category.baseUnit.isNotEmpty) {
    return category.baseUnit;
  }
  return 'pcs';
}

String _resolveImageUrl(String path) {
  if (path.startsWith('http://') || path.startsWith('https://')) {
    return path;
  }
  final base = DioClient().dio.options.baseUrl;
  final cleanPath = path.startsWith('/') ? path.substring(1) : path;
  if (cleanPath.startsWith('api/kifi-v2/upload/view') || cleanPath.startsWith('upload/view')) {
    return '$base/${cleanPath.replaceFirst('api/kifi-v2/', '')}';
  }
  return '$base/upload/view?path=${Uri.encodeComponent(cleanPath)}';
}

class InvoiceBuilderScreen extends ConsumerStatefulWidget {
  final Invoice? existingInvoice;
  final int? initialCustomerId;
  final List<InvoiceItem>? initialItems;

  const InvoiceBuilderScreen({
    super.key,
    this.existingInvoice,
    this.initialCustomerId,
    this.initialItems,
  });

  @override
  ConsumerState<InvoiceBuilderScreen> createState() => _InvoiceBuilderScreenState();
}

class _InvoiceBuilderScreenState extends ConsumerState<InvoiceBuilderScreen> {
  final _formKey = GlobalKey<FormState>();
  final _invoiceNumberCtrl = TextEditingController();
  final _notesCtrl = TextEditingController();
  final _amountPaidCtrl = TextEditingController();
  final _emiAmountCtrl = TextEditingController();
  final _discountCtrl = TextEditingController(text: '0.0');
  final _marketplaceOrderIdCtrl = TextEditingController();
  final _courierPartnerCtrl = TextEditingController();
  final _trackingNumberCtrl = TextEditingController();
  final _shippingAddressCtrl = TextEditingController();
  final _shippingPincodeCtrl = TextEditingController();

  DateTime _invoiceDate = DateTime.now();
  DateTime? _dueDate;
  int? _selectedCustomerId;
  int? _selectedSalesChannelId;
  String? _selectedSalesChannelName;
  int? _selectedPlaceOfSupplyStateId;
  String? _selectedPlaceOfSupplyStateName;
  final List<InvoiceItem> _items = [];
  bool _isLoading = false;

  // Logistics & Delivery State
  String _dispatchStatus = 'PENDING';
  bool _sameAsCustomerAddress = true;
  DateTime? _shippedAt;

  XFile? _invoiceFile;
  String? _invoiceUrl;

  String _paymentMethod = 'Cash';
  int? _selectedWalletId;
  DateTime? _nextPaymentDate;
  bool _isAmountPaidEdited = false;

  // EMI State
  bool _isEmi = false;
  String _emiCycle = 'MONTHLY';
  DateTime? _emiStartDate;

  @override
  void initState() {
    super.initState();
    if (widget.existingInvoice != null) {
      final inv = widget.existingInvoice!;
      _invoiceNumberCtrl.text = inv.invoiceNumber;
      _invoiceDate = inv.issueDate;
      _dueDate = inv.dueDate;
      _selectedCustomerId = inv.customerId;
      _selectedSalesChannelId = inv.salesChannelId;
      _selectedSalesChannelName = inv.salesChannel;
      _marketplaceOrderIdCtrl.text = inv.marketplaceOrderId ?? '';
      _courierPartnerCtrl.text = inv.courierPartner ?? '';
      _trackingNumberCtrl.text = inv.trackingNumber ?? '';
      _dispatchStatus = inv.dispatchStatus ?? 'PENDING';
      _shippedAt = inv.shippedAt;
      _shippingAddressCtrl.text = inv.shippingAddress ?? '';
      _shippingPincodeCtrl.text = inv.shippingPincode ?? '';
      _sameAsCustomerAddress = (inv.shippingAddress == null || inv.shippingAddress!.trim().isEmpty);
      _selectedPlaceOfSupplyStateId = inv.placeOfSupplyStateId;
      _selectedPlaceOfSupplyStateName = inv.placeOfSupply;
      _notesCtrl.text = inv.notes ?? '';
      _items.addAll(inv.items);
      _invoiceUrl = inv.invoiceUrl;
      if (inv.discountTotal > 0) {
        _discountCtrl.text = inv.discountTotal.toStringAsFixed(2);
      }
      _amountPaidCtrl.text = inv.amountPaid > 0 ? inv.amountPaid.toStringAsFixed(2) : '';
      _selectedWalletId = inv.paymentWalletId;
      _paymentMethod = inv.paymentMethod ?? 'Cash';
      _nextPaymentDate = inv.nextPaymentDate;
      _isAmountPaidEdited = inv.amountPaid > 0;
      _isEmi = inv.isEmi;
      _emiCycle = inv.emiCycle ?? 'MONTHLY';
      _emiStartDate = inv.emiStartDate;
      if (inv.emiAmount != null) {
        _emiAmountCtrl.text = inv.emiAmount!.toStringAsFixed(2);
      }
    } else {
      _invoiceNumberCtrl.text = 'INV-${DateTime.now().millisecondsSinceEpoch.toString().substring(7)}';
      _selectedCustomerId = widget.initialCustomerId;
      _dueDate = DateTime.now().add(const Duration(days: 30));
      _emiStartDate = DateTime.now().add(const Duration(days: 30));
      if (widget.initialItems != null) {
        _items.addAll(widget.initialItems!);
      }
    }
  }

  @override
  void dispose() {
    _invoiceNumberCtrl.dispose();
    _notesCtrl.dispose();
    _amountPaidCtrl.dispose();
    _emiAmountCtrl.dispose();
    _discountCtrl.dispose();
    _marketplaceOrderIdCtrl.dispose();
    _courierPartnerCtrl.dispose();
    _trackingNumberCtrl.dispose();
    _shippingAddressCtrl.dispose();
    _shippingPincodeCtrl.dispose();
    super.dispose();
  }

  Future<void> _pickInvoiceFile() async {
    try {
      final picker = ImagePicker();
      final picked = await picker.pickImage(
        source: ImageSource.gallery,
        imageQuality: 80,
      );
      if (picked != null) {
        setState(() {
          _invoiceFile = picked;
          _isLoading = true;
        });

        final bytes = await picked.readAsBytes();
        final formData = FormData.fromMap({
          'file': MultipartFile.fromBytes(
            bytes,
            filename: picked.name.isNotEmpty ? picked.name : 'invoice_${DateTime.now().millisecondsSinceEpoch}.jpg',
          ),
          'type': 'SALES_INVOICE',
        });

        final uploadResp = await DioClient().dio.post(
          '/upload',
          data: formData,
        );

        if (uploadResp.statusCode == 200) {
          setState(() {
            _invoiceUrl = uploadResp.data['url'];
          });
        }
      }
    } catch (e) {
      debugPrint('Error uploading sales invoice attachment: $e');
    } finally {
      if (mounted) setState(() => _isLoading = false);
    }
  }

  void _showQuickAddCustomer() {
    showModalBottomSheet(
      context: context,
      isScrollControlled: true,
      backgroundColor: Colors.transparent,
      builder: (_) => const QuickAddCustomerSheet(),
    ).then((result) {
      if (result != null) {
        if (result is Customer && result.id != null) {
          setState(() => _selectedCustomerId = result.id);
        } else {
          ref.refresh(customersProvider);
        }
      }
    });
  }

  void _openAddItemSheet({int? editIndex}) {
    showModalBottomSheet(
      context: context,
      isScrollControlled: true,
      backgroundColor: Colors.transparent,
      builder: (_) => _AddSalesItemSheet(
        initialItem: editIndex != null ? _items[editIndex] : null,
        onItemAdded: (item) {
          setState(() {
            if (editIndex != null) {
              _items[editIndex] = item;
            } else {
              _items.add(item);
            }
          });
        },
      ),
    );
  }

  Future<void> _scanBarcode() async {
    final scannedCode = await Navigator.push<String>(
      context,
      MaterialPageRoute(builder: (_) => const BarcodeScannerScreen()),
    );
    if (scannedCode != null && scannedCode.isNotEmpty) {
      final inventoryItems = ref.read(inventoryItemsProvider).value ?? [];
      final products = ref.read(productsProvider).value ?? [];
      final categories = ref.read(productCategoriesProvider).value ?? [];
      final commodityRates = ref.read(commodityRatesProvider).value ?? [];

      // Check inventory item by HUID or SKU or Barcode
      final invItem = inventoryItems.where((i) => 
        (i.huid != null && i.huid!.toUpperCase() == scannedCode.toUpperCase()) ||
        (i.sku != null && i.sku!.toUpperCase() == scannedCode.toUpperCase())
      ).firstOrNull;

      Product? matchedProduct;
      if (invItem != null) {
        matchedProduct = products.where((p) => p.id == invItem.productId).firstOrNull;
      } else {
        matchedProduct = products.where((p) => 
          (p.barcode != null && p.barcode == scannedCode) ||
          (p.sku != null && p.sku!.toUpperCase() == scannedCode.toUpperCase())
        ).firstOrNull;
      }

      if (matchedProduct != null) {
        final cat = categories.where((c) => c.id == matchedProduct!.categoryId).firstOrNull;
        double commodityRate = 0.0;
        if (cat?.commodityCode != null) {
          final match = commodityRates.where((r) => r.commodityCode.toUpperCase() == cat!.commodityCode!.toUpperCase()).firstOrNull;
          if (match != null) commodityRate = match.rate;
        }
        final purity = resolvePurity(categoryPurity: cat?.purityFactor, productPurity: matchedProduct.purityFactor);
        final effectiveRate = commodityRate > 0 ? (commodityRate * purity) : (matchedProduct.sellingPrice ?? 0.0);
        final weight = invItem?.grossWeight ?? 1.0;
        final makingCharge = invItem?.makingCharges ?? matchedProduct.makingCharges ?? cat?.defaultMakingCharge ?? 0.0;
        final makingType = invItem?.makingChargeType ?? matchedProduct.makingChargesType ?? cat?.makingChargeType ?? 'PER_GRAM';
        final metalAmount = weight * effectiveRate;

        double makingAmt = 0.0;
        if (makingType == 'PERCENTAGE') {
          makingAmt = metalAmount * (makingCharge / 100.0);
        } else if (makingType == 'PER_PIECE') {
          makingAmt = makingCharge;
        } else {
          makingAmt = weight * makingCharge;
        }

        final gstRate = matchedProduct.gstRate ?? (cat?.defaultGst ?? 3.0);
        final taxable = metalAmount + makingAmt;
        final taxAmount = (taxable * gstRate) / 100.0;
        final total = taxable + taxAmount;

        final item = InvoiceItem(
          productId: matchedProduct.id,
          inventoryItemId: invItem?.id,
          productName: matchedProduct.name,
          categoryName: cat?.name,
          commodityCode: cat?.commodityCode,
          hsnCode: cat?.defaultHsn ?? matchedProduct.hsnCode,
          sku: invItem?.sku ?? matchedProduct.sku,
          huid: invItem?.huid,
          description: matchedProduct.name,
          quantity: 1.0,
          weight: weight,
          unitPrice: effectiveRate,
          makingCharge: makingCharge,
          makingChargesType: makingType,
          taxRate: gstRate,
          total: total,
        );

        setState(() => _items.add(item));
        if (mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(content: Text('Added ${matchedProduct.name} via barcode scan!'), backgroundColor: Colors.green),
          );
        }
      } else {
        if (mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(content: Text('No item found with barcode/HUID: $scannedCode'), backgroundColor: Colors.orange),
          );
        }
      }
    }
  }

  Future<void> _saveInvoice() async {
    if (!_formKey.currentState!.validate()) return;
    if (_items.isEmpty) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Please add at least one line item')),
      );
      return;
    }

    setState(() => _isLoading = true);
    try {
      String? finalInvoiceUrl = _invoiceUrl;

      if (_invoiceFile != null && finalInvoiceUrl == null) {
        final bytes = await _invoiceFile!.readAsBytes();
        final formData = FormData.fromMap({
          'file': MultipartFile.fromBytes(
            bytes,
            filename: _invoiceFile!.name.isNotEmpty ? _invoiceFile!.name : 'invoice.jpg',
          ),
          'type': 'SALES_INVOICE',
        });
        final uploadResp = await DioClient().dio.post(
          '/upload',
          data: formData,
        );
        if (uploadResp.statusCode == 200) {
          finalInvoiceUrl = uploadResp.data['url'];
        }
      }

      final products = ref.read(productsProvider).value ?? [];
      final categories = ref.read(productCategoriesProvider).value ?? [];
      final businessStateId = ref.read(businessProfileProvider).value?.stateId;
      final customers = ref.read(customersProvider).value ?? [];
      final customer = _selectedCustomerId == null 
          ? null 
          : customers.where((c) => c.id == _selectedCustomerId).firstOrNull;
      
      final effectiveSupplyStateId = _selectedPlaceOfSupplyStateId ?? customer?.stateId ?? businessStateId;
      final isSameState = businessStateId != null && effectiveSupplyStateId != null && businessStateId == effectiveSupplyStateId;

      double subtotal = 0;
      double totalCgst = 0;
      double totalSgst = 0;
      double totalIgst = 0;
      double totalTax = 0;
      double totalMaking = 0;
      double totalDiscount = 0;
      double grandTotal = 0;

      final List<InvoiceItem> processedItems = [];

      for (var item in _items) {
        final product = products.where((p) => p.id == item.productId).firstOrNull;
        final category = categories.where((c) => c.name == item.categoryName || c.id == product?.categoryId).firstOrNull;
        final gstRate = item.taxRate > 0 ? item.taxRate : (product?.gstRate ?? 0.0);

        final qtyOrWeight = item.weight != null && item.weight! > 0 ? item.weight! : (item.quantity > 0 ? item.quantity : 1.0);
        final baseItemAmt = qtyOrWeight * item.unitPrice;

        final isItemCommodity = _isCommodityProduct(category: category, product: product, invoiceItem: item);

        double makingChargeAmt = 0.0;
        if (isItemCommodity) {
          if (item.makingChargesType == 'PERCENTAGE') {
            makingChargeAmt = baseItemAmt * (item.makingCharge / 100.0);
          } else if (item.makingChargesType == 'PER_PIECE') {
            makingChargeAmt = item.makingCharge;
          } else {
            makingChargeAmt = qtyOrWeight * item.makingCharge;
          }
        }

        final taxableAmount = baseItemAmt + makingChargeAmt + item.otherCharges - item.discount;
        final taxAmount = (taxableAmount * gstRate) / 100.0;

        double cgst = 0;
        double sgst = 0;
        double igst = 0;

        if (isSameState) {
          cgst = taxAmount / 2.0;
          sgst = taxAmount / 2.0;
          totalCgst += cgst;
          totalSgst += sgst;
        } else {
          igst = taxAmount;
          totalIgst += igst;
        }

        final lineTotal = taxableAmount + taxAmount;

        subtotal += baseItemAmt;
        totalMaking += makingChargeAmt;
        totalTax += taxAmount;

        processedItems.add(item.copyWith(
          quantity: item.quantity > 0 ? item.quantity : qtyOrWeight,
          weight: item.weight,
          taxRate: gstRate,
          cgst: cgst,
          sgst: sgst,
          igst: igst,
          total: lineTotal,
        ));
      }

      final invoiceDiscount = double.tryParse(_discountCtrl.text) ?? 0.0;
      totalDiscount = double.parse(invoiceDiscount.toStringAsFixed(2));
      final rawGrandTotal = (subtotal + totalMaking - invoiceDiscount).clamp(0.0, double.infinity) + totalTax;
      grandTotal = double.parse(rawGrandTotal.toStringAsFixed(2));

      final amountPaid = double.tryParse(_amountPaidCtrl.text) ?? (_isAmountPaidEdited ? 0.0 : grandTotal);
      final validAmountPaid = double.parse((amountPaid > grandTotal ? grandTotal : amountPaid).toStringAsFixed(2));
      final balanceDue = double.parse((grandTotal - validAmountPaid).clamp(0.0, double.infinity).toStringAsFixed(2));
      final isFullyPaid = balanceDue.abs() < 0.01 || validAmountPaid >= grandTotal - 0.01;
      final determinedStatus = isFullyPaid ? 'PAID' : (validAmountPaid > 0.01 ? 'PARTIAL' : 'DRAFT');

      final invoice = Invoice(
        id: widget.existingInvoice?.id,
        customerId: _selectedCustomerId,
        invoiceNumber: _invoiceNumberCtrl.text.trim(),
        issueDate: _invoiceDate,
        dueDate: _dueDate,
        subtotal: double.parse(subtotal.toStringAsFixed(2)),
        taxTotal: double.parse(totalTax.toStringAsFixed(2)),
        cgstTotal: double.parse(totalCgst.toStringAsFixed(2)),
        sgstTotal: double.parse(totalSgst.toStringAsFixed(2)),
        igstTotal: double.parse(totalIgst.toStringAsFixed(2)),
        discountTotal: totalDiscount,
        totalAmount: grandTotal,
        amountPaid: validAmountPaid,
        paymentMethod: validAmountPaid > 0 ? _paymentMethod : null,
        paymentWalletId: validAmountPaid > 0
            ? (_selectedWalletId ??
                ref.read(walletProvider).value?.where((w) => w.nature == 'CASH' || w.nature == 'SAVINGS').firstOrNull?.id)
            : null,
        nextPaymentDate: balanceDue > 0.01 ? (_nextPaymentDate ?? DateTime.now().add(const Duration(days: 30))) : null,
        status: widget.existingInvoice != null
            ? (isFullyPaid ? 'PAID' : (validAmountPaid > 0.01 ? 'PARTIAL' : widget.existingInvoice!.status))
            : determinedStatus,
        notes: _notesCtrl.text.trim().isEmpty ? null : _notesCtrl.text.trim(),
        invoiceUrl: finalInvoiceUrl,
        isEmi: _isEmi,
        emiAmount: _isEmi && _emiAmountCtrl.text.isNotEmpty ? double.tryParse(_emiAmountCtrl.text) : null,
        emiCycle: _isEmi ? _emiCycle : null,
        emiStartDate: _isEmi ? (_emiStartDate ?? DateTime.now().add(const Duration(days: 30))) : null,
        salesChannelId: _selectedSalesChannelId,
        salesChannel: _selectedSalesChannelName,
        marketplaceOrderId: _marketplaceOrderIdCtrl.text.trim().isNotEmpty ? _marketplaceOrderIdCtrl.text.trim() : null,
        courierPartner: _courierPartnerCtrl.text.trim().isNotEmpty ? _courierPartnerCtrl.text.trim() : null,
        trackingNumber: _trackingNumberCtrl.text.trim().isNotEmpty ? _trackingNumberCtrl.text.trim() : null,
        dispatchStatus: _dispatchStatus,
        shippedAt: _shippedAt ?? (_dispatchStatus == 'SHIPPED' || _dispatchStatus == 'IN_TRANSIT' || _dispatchStatus == 'DELIVERED' ? DateTime.now() : null),
        shippingAddress: !_sameAsCustomerAddress && _shippingAddressCtrl.text.trim().isNotEmpty ? _shippingAddressCtrl.text.trim() : null,
        shippingPincode: !_sameAsCustomerAddress && _shippingPincodeCtrl.text.trim().isNotEmpty ? _shippingPincodeCtrl.text.trim() : null,
        placeOfSupplyStateId: effectiveSupplyStateId,
        placeOfSupply: _selectedPlaceOfSupplyStateName ?? ref.read(indianStatesProvider).value?.where((s) => s.id == effectiveSupplyStateId).firstOrNull?.name,
        items: processedItems,
      );

      Invoice? savedInvoice;
      if (widget.existingInvoice == null) {
        savedInvoice = await ref.read(invoicesProvider.notifier).createInvoice(invoice);
      } else {
        final resp = await DioClient().dio.put(
          '/invoices/${widget.existingInvoice!.id}',
          data: invoice.toJson(),
        );
        if (resp.statusCode == 200) {
          savedInvoice = Invoice.fromJson(resp.data);
          ref.refresh(invoicesProvider);
        }
      }

      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Sales Invoice saved successfully!'), backgroundColor: Colors.green),
        );
        if (savedInvoice != null) {
          Navigator.pushReplacement(
            context,
            MaterialPageRoute(
              builder: (_) => InvoiceDetailsScreen(invoice: savedInvoice!),
            ),
          );
        } else {
          Navigator.pop(context);
        }
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Error saving invoice: $e'), backgroundColor: Colors.red),
        );
      }
    } finally {
      if (mounted) setState(() => _isLoading = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    final customersState = ref.watch(customersProvider);
    final isDark = Theme.of(context).brightness == Brightness.dark;

    return Scaffold(
      appBar: AppBar(
        title: Text(
          widget.existingInvoice == null
              ? 'New Sales Invoice'
              : 'Edit Invoice ${_invoiceNumberCtrl.text}',
          style: const TextStyle(fontWeight: FontWeight.bold),
        ),
        actions: [
          IconButton(
            icon: const Icon(LucideIcons.qrCode),
            tooltip: 'Scan Barcode/HUID',
            onPressed: _scanBarcode,
          ),
          if (_isLoading)
            const Padding(
              padding: EdgeInsets.all(16.0),
              child: SizedBox(
                width: 20,
                height: 20,
                child: CircularProgressIndicator(strokeWidth: 2),
              ),
            )
          else
            TextButton.icon(
              onPressed: _saveInvoice,
              icon: const Icon(LucideIcons.check, size: 18),
              label: const Text('Save', style: TextStyle(fontWeight: FontWeight.bold)),
            ),
        ],
      ),
      body: GestureDetector(
        onTap: () => FocusScope.of(context).unfocus(),
        behavior: HitTestBehavior.translucent,
        child: Form(
          key: _formKey,
          child: ListView(
            keyboardDismissBehavior: ScrollViewKeyboardDismissBehavior.onDrag,
            padding: const EdgeInsets.all(16.0),
            children: [
            // E-Commerce / Sales Channels Selector (If enabled)
            Builder(
              builder: (context) {
                final featureState = ref.watch(businessFeatureProvider);
                final businessProfile = ref.watch(businessProfileProvider).value;
                final nature = (businessProfile?.natureOfBusiness ?? businessProfile?.industry ?? 'JEWELLERY').toUpperCase();
                final isJewellery = nature == 'JEWELLERY';
                final isChannelsEnabled = featureState.value?.enableEcommerceChannels ?? (!isJewellery);

                if (!isChannelsEnabled) return const SizedBox.shrink();

                final salesChannelsState = ref.watch(salesChannelsProvider);

                return salesChannelsState.when(
                  data: (channels) {
                    final activeChannels = channels.where((c) => c.isActive).toList();
                    if (activeChannels.isEmpty) return const SizedBox.shrink();

                    final currentSelectedId = _selectedSalesChannelId;
                    final selectedChannel = activeChannels.where((c) =>
                        (currentSelectedId != null && c.id == currentSelectedId) ||
                        (currentSelectedId == null && c.name.toUpperCase() == (_selectedSalesChannelName ?? '').toUpperCase())
                    ).firstOrNull ?? activeChannels.where((c) => c.code == 'DIRECT' || c.name.toLowerCase().contains('direct')).firstOrNull ?? activeChannels.first;

                    final isMarketplace = (selectedChannel.code != 'DIRECT' &&
                        !selectedChannel.name.toLowerCase().contains('direct') &&
                        !selectedChannel.name.toLowerCase().contains('store'));

                    return Container(
                      margin: const EdgeInsets.only(bottom: 16.0),
                      padding: const EdgeInsets.all(12.0),
                      decoration: BoxDecoration(
                        color: Theme.of(context).colorScheme.surfaceContainerHighest.withValues(alpha: 0.35),
                        borderRadius: BorderRadius.circular(12),
                        border: Border.all(color: Colors.grey.withValues(alpha: 0.2)),
                      ),
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Row(
                            children: [
                              Icon(LucideIcons.shoppingBag, size: 16, color: Colors.blue.shade700),
                              const SizedBox(width: 6),
                              const Text(
                                'Sales Channel / Marketplace',
                                style: TextStyle(fontWeight: FontWeight.bold, fontSize: 13),
                              ),
                            ],
                          ),
                          const SizedBox(height: 10),
                          SingleChildScrollView(
                            scrollDirection: Axis.horizontal,
                            child: Row(
                              children: activeChannels.map((channel) {
                                final isSelected = (currentSelectedId != null && currentSelectedId == channel.id) ||
                                    (currentSelectedId == null && selectedChannel.id == channel.id);

                                IconData iconData = LucideIcons.store;
                                if (channel.code == 'AMAZON' || channel.name.toLowerCase().contains('amazon')) {
                                  iconData = LucideIcons.shoppingCart;
                                } else if (channel.code == 'FLIPKART' || channel.name.toLowerCase().contains('flipkart')) {
                                  iconData = LucideIcons.package;
                                } else if (channel.code == 'SHOPIFY' || channel.name.toLowerCase().contains('shopify')) {
                                  iconData = LucideIcons.globe;
                                } else if (channel.code == 'MEESHO' || channel.name.toLowerCase().contains('meesho')) {
                                  iconData = LucideIcons.tag;
                                } else if (channel.code == 'QUICK_COMMERCE' || channel.name.toLowerCase().contains('quick')) {
                                  iconData = LucideIcons.zap;
                                }

                                return Padding(
                                  padding: const EdgeInsets.only(right: 8.0),
                                  child: ChoiceChip(
                                    selected: isSelected,
                                    avatar: Icon(
                                      iconData,
                                      size: 15,
                                      color: isSelected ? Colors.white : Colors.grey.shade700,
                                    ),
                                    label: Text(
                                      channel.name,
                                      style: TextStyle(
                                        fontSize: 12,
                                        fontWeight: isSelected ? FontWeight.bold : FontWeight.normal,
                                        color: isSelected ? Colors.white : Colors.grey.shade800,
                                      ),
                                    ),
                                    selectedColor: Colors.blue.shade700,
                                    onSelected: (selected) {
                                      if (selected) {
                                        setState(() {
                                          _selectedSalesChannelId = channel.id;
                                          _selectedSalesChannelName = channel.name;

                                          // If customer is not yet selected, attempt matching default channel customer (e.g. Amazon)
                                          if (_selectedCustomerId == null) {
                                            final customersList = ref.read(customersProvider).value ?? [];
                                            final match = customersList.where((c) =>
                                                c.name.toLowerCase().contains(channel.name.toLowerCase()) ||
                                                (channel.code != null && c.name.toLowerCase().contains(channel.code!.toLowerCase()))
                                            ).firstOrNull;
                                            if (match != null) {
                                              _selectedCustomerId = match.id;
                                              if (match.stateId != null) {
                                                _selectedPlaceOfSupplyStateId = match.stateId;
                                              }
                                            }
                                          }
                                        });
                                      }
                                    },
                                  ),
                                );
                              }).toList(),
                            ),
                          ),
                          if (isMarketplace) ...[
                            const SizedBox(height: 12),
                            PremiumTextField(
                              controller: _marketplaceOrderIdCtrl,
                              labelText: '${selectedChannel.name} Order ID (e.g. 408-1234567-8901234)',
                              prefixIcon: const Icon(LucideIcons.hash, size: 16),
                            ),
                          ],
                        ],
                      ),
                    );
                  },
                  loading: () => const SizedBox.shrink(),
                  error: (err, stack) => const SizedBox.shrink(),
                );
              },
            ),
            // Customer Selection Row + Quick Add
            Row(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Expanded(
                  child: customersState.when(
                    data: (customers) => SmartSearchDropdown<Customer>(
                      labelText: 'Customer *',
                      hintText: 'Search Customer by Name / Phone / GSTIN / City',
                      value: customers.where((c) => c.id == _selectedCustomerId).firstOrNull,
                      items: customers,
                      itemAsString: (c) => c.name,
                      filterFn: (c, query) {
                        final q = query.toLowerCase();
                        return c.name.toLowerCase().contains(q) ||
                            (c.phone != null && c.phone!.contains(q)) ||
                            (c.email != null && c.email!.toLowerCase().contains(q)) ||
                            (c.gstin != null && c.gstin!.toLowerCase().contains(q)) ||
                            (c.address != null && c.address!.toLowerCase().contains(q));
                      },
                      itemBuilder: (context, c) {
                        return Padding(
                          padding: const EdgeInsets.symmetric(horizontal: 14.0, vertical: 10.0),
                          child: Row(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              CircleAvatar(
                                radius: 18,
                                backgroundColor: Colors.blue.withValues(alpha: 0.15),
                                child: Text(
                                  c.name.isNotEmpty ? c.name[0].toUpperCase() : 'C',
                                  style: const TextStyle(fontWeight: FontWeight.bold, color: Colors.blue, fontSize: 14),
                                ),
                              ),
                              const SizedBox(width: 12),
                              Expanded(
                                child: Column(
                                  crossAxisAlignment: CrossAxisAlignment.start,
                                  children: [
                                    Text(
                                      c.name,
                                      style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 14),
                                    ),
                                    const SizedBox(height: 3),
                                    Wrap(
                                      spacing: 6,
                                      runSpacing: 3,
                                      children: [
                                        if (c.phone != null && c.phone!.isNotEmpty)
                                          _buildSmallBadge(c.phone!, Colors.teal),
                                        if (c.address != null && c.address!.isNotEmpty)
                                          _buildSmallBadge(c.address!, Colors.purple),
                                        if (c.gstin != null && c.gstin!.isNotEmpty)
                                          _buildSmallBadge('GST: ${c.gstin}', Colors.indigo),
                                      ],
                                    ),
                                  ],
                                ),
                              ),
                            ],
                          ),
                        );
                      },
                      onChanged: (val) {
                        setState(() {
                          _selectedCustomerId = val?.id;
                          if (val?.stateId != null) {
                            _selectedPlaceOfSupplyStateId = val!.stateId;
                          }
                        });
                      },
                    ),
                    loading: () => const Center(child: CircularProgressIndicator()),
                    error: (e, _) => Text('Error loading customers: $e'),
                  ),
                ),
                const SizedBox(width: 8),
                Padding(
                  padding: const EdgeInsets.only(top: 4.0),
                  child: IconButton.filledTonal(
                    onPressed: _showQuickAddCustomer,
                    icon: const Icon(LucideIcons.userPlus, size: 20),
                    tooltip: 'Quick Add Customer',
                  ),
                ),
              ],
            ),
            const SizedBox(height: 12),

            // Place of Supply / Destination Delivery State
            Consumer(
              builder: (context, ref, child) {
                final statesState = ref.watch(indianStatesProvider);
                final businessStateId = ref.watch(businessProfileProvider).value?.stateId;
                final customers = ref.watch(customersProvider).value ?? [];
                final customer = _selectedCustomerId == null 
                    ? null 
                    : customers.where((c) => c.id == _selectedCustomerId).firstOrNull;

                final effectiveStateId = _selectedPlaceOfSupplyStateId ?? customer?.stateId ?? businessStateId;
                final isSameState = businessStateId != null && effectiveStateId != null && businessStateId == effectiveStateId;

                return statesState.when(
                  data: (states) {
                    final selectedState = states.where((s) => s.id == effectiveStateId).firstOrNull;

                    return Container(
                      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
                      decoration: BoxDecoration(
                        color: isSameState
                            ? Colors.green.withValues(alpha: 0.05)
                            : Colors.purple.withValues(alpha: 0.05),
                        borderRadius: BorderRadius.circular(12),
                        border: Border.all(
                          color: isSameState
                              ? Colors.green.withValues(alpha: 0.25)
                              : Colors.purple.withValues(alpha: 0.25),
                        ),
                      ),
                      child: Row(
                        children: [
                          Icon(
                            LucideIcons.mapPin,
                            size: 18,
                            color: isSameState ? Colors.green.shade700 : Colors.purple.shade700,
                          ),
                          const SizedBox(width: 10),
                          Expanded(
                            child: Column(
                              crossAxisAlignment: CrossAxisAlignment.start,
                              children: [
                                Row(
                                  children: [
                                    Text(
                                      'Place of Supply (Delivery State)',
                                      style: TextStyle(
                                        fontSize: 11,
                                        fontWeight: FontWeight.bold,
                                        color: Colors.grey.shade600,
                                      ),
                                    ),
                                    const SizedBox(width: 6),
                                    Container(
                                      padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 1.5),
                                      decoration: BoxDecoration(
                                        color: isSameState ? Colors.green.shade100 : Colors.purple.shade100,
                                        borderRadius: BorderRadius.circular(4),
                                      ),
                                      child: Text(
                                        isSameState ? 'Intra-state (CGST + SGST)' : 'Inter-state (IGST)',
                                        style: TextStyle(
                                          fontSize: 9.5,
                                          fontWeight: FontWeight.bold,
                                          color: isSameState ? Colors.green.shade900 : Colors.purple.shade900,
                                        ),
                                      ),
                                    ),
                                  ],
                                ),
                                const SizedBox(height: 2),
                                DropdownButtonHideUnderline(
                                  child: DropdownButton<int>(
                                    value: selectedState?.id,
                                    isDense: true,
                                    isExpanded: true,
                                    hint: const Text('Select State of Supply', style: TextStyle(fontSize: 13)),
                                    items: states.map((s) {
                                      final isHome = s.id == businessStateId;
                                      return DropdownMenuItem<int>(
                                        value: s.id,
                                        child: Text(
                                          '${s.name} (${s.gstCode})${isHome ? " - Home State" : ""}',
                                          style: TextStyle(
                                            fontSize: 13,
                                            fontWeight: isHome ? FontWeight.bold : FontWeight.normal,
                                          ),
                                        ),
                                      );
                                    }).toList(),
                                    onChanged: (val) {
                                      if (val != null) {
                                        final picked = states.where((s) => s.id == val).firstOrNull;
                                        setState(() {
                                          _selectedPlaceOfSupplyStateId = val;
                                          _selectedPlaceOfSupplyStateName = picked?.name;
                                        });
                                      }
                                    },
                                  ),
                                ),
                              ],
                            ),
                          ),
                        ],
                      ),
                    );
                  },
                  loading: () => const SizedBox.shrink(),
                  error: (err, stack) => const SizedBox.shrink(),
                );
              },
            ),
            const SizedBox(height: 16),

            PremiumTextField(
              controller: _invoiceNumberCtrl,
              labelText: 'Invoice Number *',
              prefixIcon: const Icon(LucideIcons.fileText),
              validator: (val) => val == null || val.isEmpty ? 'Required' : null,
            ),
            const SizedBox(height: 16),
            InkWell(
              onTap: () async {
                final picked = await showDatePicker(
                  context: context,
                  initialDate: _invoiceDate,
                  firstDate: DateTime(2000),
                  lastDate: DateTime(2100),
                );
                if (picked != null) {
                  setState(() => _invoiceDate = picked);
                }
              },
              child: InputDecorator(
                decoration: InputDecoration(
                  labelText: 'Invoice Date',
                  prefixIcon: const Icon(LucideIcons.calendar),
                  border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
                ),
                child: Text(
                  DateFormat('dd MMM yyyy').format(_invoiceDate),
                  style: const TextStyle(fontWeight: FontWeight.w600, fontSize: 14),
                ),
              ),
            ),
            const SizedBox(height: 24),

            // Items Section Header with Barcode + Add Item
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text(
                  'Invoice Items (${_items.length})',
                  style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
                ),
                Row(
                  children: [
                    IconButton.filledTonal(
                      onPressed: _scanBarcode,
                      icon: const Icon(LucideIcons.qrCode, size: 18),
                      tooltip: 'Scan Barcode',
                    ),
                    const SizedBox(width: 8),
                    FilledButton.tonalIcon(
                      onPressed: () => _openAddItemSheet(),
                      icon: const Icon(LucideIcons.plus, size: 16),
                      label: const Text('Add Item'),
                    ),
                  ],
                ),
              ],
            ),
            const SizedBox(height: 12),

            // Items List
            if (_items.isEmpty)
              Container(
                width: double.infinity,
                padding: const EdgeInsets.all(32),
                decoration: BoxDecoration(
                  color: isDark ? const Color(0xFF1E293B) : Colors.grey.shade100,
                  borderRadius: BorderRadius.circular(16),
                  border: Border.all(color: Colors.grey.withValues(alpha: 0.2)),
                ),
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  crossAxisAlignment: CrossAxisAlignment.center,
                  children: [
                    Icon(LucideIcons.packageOpen, size: 48, color: Colors.grey.shade400),
                    const SizedBox(height: 12),
                    Text(
                      'No items added yet',
                      style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: Colors.grey.shade600),
                    ),
                    const SizedBox(height: 4),
                    Text(
                      'Tap "Add Item" or scan a barcode/SKU to add sales items',
                      style: TextStyle(fontSize: 12, color: Colors.grey.shade500),
                    ),
                  ],
                ),
              )
            else
              ..._items.asMap().entries.map((entry) {
                final idx = entry.key;
                final item = entry.value;
                return _buildSalesItemCard(item, idx, isDark);
              }),

            const SizedBox(height: 20),

            // Invoice Discount Input Field before Summary
            PremiumTextField(
              controller: _discountCtrl,
              labelText: 'Invoice Discount (₹)',
              prefixIcon: const Icon(LucideIcons.tag, color: Colors.red),
              keyboardType: const TextInputType.numberWithOptions(decimal: true),
              onChanged: (_) => setState(() {}),
            ),

            const SizedBox(height: 20),

            // Grand Total & Tax Summary Box
            _buildTotalsSummaryCard(isDark),

            const SizedBox(height: 24),

            // Payment / Settlement Details (Full Partial Payment & EMI Support)
            _buildPaymentSection(isDark),

            const SizedBox(height: 24),

            // Shipping & Courier Logistics Section
            _buildShippingLogisticsSection(isDark),

            const SizedBox(height: 24),

            // Notes & Remarks
            PremiumTextField(
              controller: _notesCtrl,
              labelText: 'Notes & Terms',
              maxLines: 3,
              prefixIcon: const Icon(LucideIcons.alignLeft),
            ),
            const SizedBox(height: 24),

            // Attachments
            Text(
              'Attached Invoice / Documents',
              style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
            ),
            const SizedBox(height: 8),
            if (_invoiceFile != null)
              ListTile(
                leading: const Icon(LucideIcons.image, color: Colors.blue),
                title: Text(_invoiceFile!.name),
                subtitle: const Text('Tap to view image', style: TextStyle(fontSize: 12, color: Colors.blue)),
                onTap: () {
                  Navigator.push(
                    context,
                    MaterialPageRoute(
                      builder: (_) => AttachmentGalleryScreen(
                        images: [kIsWeb ? NetworkImage(_invoiceFile!.path) : FileImage(File(_invoiceFile!.path))],
                        initialIndex: 0,
                      ),
                    ),
                  );
                },
                trailing: IconButton(
                  icon: const Icon(LucideIcons.x),
                  onPressed: () => setState(() => _invoiceFile = null),
                ),
              )
            else if (_invoiceUrl != null && _invoiceUrl!.isNotEmpty)
              ListTile(
                leading: const Icon(LucideIcons.image, color: Colors.blue),
                title: const Text('View Attached Invoice'),
                subtitle: const Text('Tap to view full image', style: TextStyle(fontSize: 12, color: Colors.blue)),
                onTap: () {
                  Navigator.push(
                    context,
                    MaterialPageRoute(
                      builder: (_) => AttachmentGalleryScreen(
                        images: [NetworkImage(_resolveImageUrl(_invoiceUrl!))],
                        initialIndex: 0,
                      ),
                    ),
                  );
                },
                trailing: IconButton(
                  icon: const Icon(LucideIcons.x),
                  onPressed: () => setState(() => _invoiceUrl = null),
                ),
              )
            else
              OutlinedButton.icon(
                onPressed: _pickInvoiceFile,
                icon: const Icon(LucideIcons.paperclip),
                label: const Text('Attach Sales Bill / Slip'),
                style: OutlinedButton.styleFrom(
                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
                  padding: const EdgeInsets.symmetric(vertical: 14),
                ),
              ),
            const SizedBox(height: 40),
          ],
        ),
      ),
    ),
  );
  }

  Widget _buildSalesItemCard(InvoiceItem item, int index, bool isDark) {
    final uoms = ref.watch(uomsProvider).value ?? [];
    final products = ref.watch(productsProvider).value ?? [];
    final categories = ref.watch(productCategoriesProvider).value ?? [];
    final product = products.where((p) => p.id == item.productId).firstOrNull;
    final category = categories.where((c) => c.name == item.categoryName || c.id == product?.categoryId).firstOrNull;

    final isItemCommodity = _isCommodityProduct(
      category: category,
      product: product,
      invoiceItem: item,
    );

    final qtyOrWeight = item.weight != null && item.weight! > 0 ? item.weight! : (item.quantity > 0 ? item.quantity : 1.0);
    final baseAmount = qtyOrWeight * item.unitPrice;
    
    double makingChargeAmt = 0.0;
    if (isItemCommodity) {
      if (item.makingChargesType == 'PERCENTAGE') {
        makingChargeAmt = baseAmount * (item.makingCharge / 100.0);
      } else if (item.makingChargesType == 'PER_PIECE') {
        makingChargeAmt = item.makingCharge;
      } else {
        makingChargeAmt = qtyOrWeight * item.makingCharge;
      }
    }

    final taxableAmount = baseAmount + makingChargeAmt + item.otherCharges - item.discount;
    final taxAmount = (taxableAmount * item.taxRate) / 100.0;
    final calculatedTotal = item.total > 0 ? item.total : (taxableAmount + taxAmount);
    final unit = _resolveProductUnit(product: product, category: category, uoms: uoms, isCommodity: isItemCommodity);

    return Container(
      margin: const EdgeInsets.only(bottom: 12),
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: isDark ? const Color(0xFF1E293B) : Colors.white,
        borderRadius: BorderRadius.circular(16),
        border: Border.all(color: isDark ? Colors.white12 : Colors.grey.shade200),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withValues(alpha: isDark ? 0.2 : 0.04),
            blurRadius: 10,
            offset: const Offset(0, 4),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              if (item.photoUrl != null && item.photoUrl!.isNotEmpty)
                Container(
                  width: 48,
                  height: 48,
                  margin: const EdgeInsets.only(right: 12),
                  decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(8),
                    image: DecorationImage(
                      image: NetworkImage(_resolveImageUrl(item.photoUrl!)),
                      fit: BoxFit.cover,
                    ),
                  ),
                ),
              Expanded(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      item.productName ?? item.description ?? 'Item #${index + 1}',
                      style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 16),
                    ),
                    const SizedBox(height: 4),
                    Wrap(
                      spacing: 6,
                      runSpacing: 4,
                      children: [
                        if (item.categoryName != null && item.categoryName!.isNotEmpty)
                          _buildSmallBadge(item.categoryName!, const Color(0xFFD4AF37)),
                        if (item.sku != null && item.sku!.isNotEmpty)
                          _buildSmallBadge('SKU: ${item.sku}', Colors.blue),
                        if (isItemCommodity && item.huid != null && item.huid!.isNotEmpty)
                          _buildSmallBadge('HUID: ${item.huid}', Colors.purple),
                        if (item.hsnCode != null && item.hsnCode!.isNotEmpty)
                          _buildSmallBadge('HSN: ${item.hsnCode}', Colors.grey),
                        if (!isItemCommodity)
                          _buildSmallBadge('Unit: $unit', Colors.teal),
                      ],
                    ),
                  ],
                ),
              ),
              IconButton(
                icon: const Icon(LucideIcons.edit2, size: 18, color: Colors.blue),
                tooltip: 'Edit Item',
                onPressed: () => _openAddItemSheet(editIndex: index),
              ),
              IconButton(
                icon: const Icon(LucideIcons.trash2, size: 18, color: Colors.red),
                tooltip: 'Remove Item',
                onPressed: () {
                  setState(() => _items.removeAt(index));
                },
              ),
            ],
          ),
          const Divider(height: 20),
          if (isItemCommodity) ...[
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text(
                  'Metal: ${qtyOrWeight.toStringAsFixed(3)}$unit × ₹${item.unitPrice.toStringAsFixed(2)}',
                  style: TextStyle(fontSize: 13, color: Colors.grey.shade600),
                ),
                Text(
                  '₹${baseAmount.toStringAsFixed(2)}',
                  style: const TextStyle(fontWeight: FontWeight.w600, fontSize: 13),
                ),
              ],
            ),
            if (makingChargeAmt > 0) ...[
              const SizedBox(height: 4),
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  Text(
                    'Making Charges (${item.makingChargesType == 'PERCENTAGE' ? '${item.makingCharge}%' : (item.makingChargesType == 'PER_PIECE' ? '₹${item.makingCharge}/pc' : '₹${item.makingCharge}/g')}):',
                    style: TextStyle(fontSize: 13, color: Colors.grey.shade600),
                  ),
                  Text(
                    '₹${makingChargeAmt.toStringAsFixed(2)}',
                    style: const TextStyle(fontWeight: FontWeight.w600, fontSize: 13, color: Colors.indigo),
                  ),
                ],
              ),
            ],
          ] else ...[
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text(
                  'Rate: ₹${item.unitPrice.toStringAsFixed(2)} / $unit  •  Qty: ${qtyOrWeight.toStringAsFixed(qtyOrWeight.truncateToDouble() == qtyOrWeight ? 0 : 2)} $unit',
                  style: TextStyle(fontSize: 13, color: Colors.grey.shade600, fontWeight: FontWeight.w500),
                ),
                Text(
                  '₹${baseAmount.toStringAsFixed(2)}',
                  style: const TextStyle(fontWeight: FontWeight.w600, fontSize: 13),
                ),
              ],
            ),
          ],
          if (item.discount > 0) ...[
            const SizedBox(height: 4),
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                const Text('Discount:', style: TextStyle(fontSize: 12, color: Colors.red)),
                Text('- ₹${item.discount.toStringAsFixed(2)}', style: const TextStyle(fontSize: 12, fontWeight: FontWeight.bold, color: Colors.red)),
              ],
            ),
          ],
          if (item.taxRate > 0) ...[
            const SizedBox(height: 4),
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text(
                  'GST (${item.taxRate.toStringAsFixed(1)}%):',
                  style: TextStyle(fontSize: 12, color: Colors.grey.shade500),
                ),
                Text(
                  '+ ₹${taxAmount.toStringAsFixed(2)}',
                  style: TextStyle(fontSize: 12, color: Colors.grey.shade600),
                ),
              ],
            ),
          ],
          const SizedBox(height: 8),
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              const Text('Item Total:', style: TextStyle(fontWeight: FontWeight.bold, fontSize: 14)),
              Text(
                '₹${calculatedTotal.toStringAsFixed(2)}',
                style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 16, color: Colors.green),
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget _buildSmallBadge(String text, Color color) {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
      decoration: BoxDecoration(
        color: color.withValues(alpha: 0.12),
        borderRadius: BorderRadius.circular(6),
        border: Border.all(color: color.withValues(alpha: 0.3), width: 0.5),
      ),
      child: Text(
        text,
        style: TextStyle(fontSize: 10, fontWeight: FontWeight.bold, color: color),
      ),
    );
  }

  Widget _buildTotalsSummaryCard(bool isDark) {
    final businessProfile = ref.watch(businessProfileProvider).value;
    final businessStateId = businessProfile?.stateId;
    final products = ref.watch(productsProvider).value ?? [];
    final categories = ref.watch(productCategoriesProvider).value ?? [];

    final customers = ref.watch(customersProvider).value ?? [];
    final customer = _selectedCustomerId == null 
        ? null 
        : customers.where((c) => c.id == _selectedCustomerId).firstOrNull;
    
    final discountAmount = double.tryParse(_discountCtrl.text) ?? 0.0;
    final effectiveSupplyStateId = _selectedPlaceOfSupplyStateId ?? customer?.stateId ?? businessStateId;
    final isSameState = businessStateId != null && effectiveSupplyStateId != null && businessStateId == effectiveSupplyStateId;

    final hasCommodityItems = _items.any((item) {
      final product = products.where((p) => p.id == item.productId).firstOrNull;
      final category = categories.where((c) => c.name == item.categoryName || c.id == product?.categoryId).firstOrNull;
      return _isCommodityProduct(category: category, product: product, invoiceItem: item);
    });

    double itemsSubtotal = 0;
    double makingChargesTotal = 0;
    double rawTaxableTotal = 0;
    double taxTotal = 0;

    for (var item in _items) {
      final product = products.where((p) => p.id == item.productId).firstOrNull;
      final category = categories.where((c) => c.name == item.categoryName || c.id == product?.categoryId).firstOrNull;
      final qtyOrWeight = item.weight != null && item.weight! > 0 ? item.weight! : (item.quantity > 0 ? item.quantity : 1.0);
      final baseAmt = qtyOrWeight * item.unitPrice;

      final isItemCommodity = _isCommodityProduct(category: category, product: product, invoiceItem: item);

      double makingAmt = 0.0;
      if (isItemCommodity) {
        if (item.makingChargesType == 'PERCENTAGE') {
          makingAmt = baseAmt * (item.makingCharge / 100.0);
        } else if (item.makingChargesType == 'PER_PIECE') {
          makingAmt = item.makingCharge;
        } else {
          makingAmt = qtyOrWeight * item.makingCharge;
        }
      }

      final itemTaxable = baseAmt + makingAmt + item.otherCharges - item.discount;
      final itemGstRate = item.taxRate > 0 ? item.taxRate : (product?.gstRate ?? (category?.defaultGst ?? (isItemCommodity ? 3.0 : 18.0)));
      final itemTax = (itemTaxable.clamp(0.0, double.infinity) * itemGstRate) / 100.0;

      itemsSubtotal += baseAmt;
      makingChargesTotal += makingAmt;
      rawTaxableTotal += (baseAmt + makingAmt + item.otherCharges);
      taxTotal += itemTax;
    }

    final effectiveTaxable = (rawTaxableTotal - discountAmount).clamp(0.0, double.infinity);
    if (rawTaxableTotal > 0 && discountAmount > 0) {
      taxTotal = taxTotal * (effectiveTaxable / rawTaxableTotal);
    }
    final grandTotal = effectiveTaxable + taxTotal;

    final effectiveGstRate = (effectiveTaxable > 0 && taxTotal > 0)
        ? (taxTotal / effectiveTaxable) * 100.0
        : (_items.isNotEmpty ? _items.first.taxRate : (hasCommodityItems ? 3.0 : 18.0));
    final cgstRate = effectiveGstRate / 2.0;
    final sgstRate = effectiveGstRate / 2.0;
    final igstRate = effectiveGstRate;

    String formatRate(double rate) {
      if (rate <= 0) return '0%';
      final rounded = (rate * 100).round() / 100;
      if (rounded.truncateToDouble() == rounded) {
        return '${rounded.toInt()}%';
      }
      return '${rounded.toStringAsFixed(1)}%';
    }

    return Container(
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        color: isDark ? const Color(0xFF1E293B) : Colors.white,
        borderRadius: BorderRadius.circular(20),
        border: Border.all(color: isDark ? Colors.white12 : Colors.grey.shade200),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withValues(alpha: isDark ? 0.2 : 0.05),
            blurRadius: 15,
            offset: const Offset(0, 5),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          const Text('INVOICE SUMMARY', style: TextStyle(fontSize: 12, fontWeight: FontWeight.bold, letterSpacing: 0.8, color: Colors.grey)),
          const SizedBox(height: 14),
          if (hasCommodityItems) ...[
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                const Text('Metal Subtotal:'),
                Text('₹${itemsSubtotal.toStringAsFixed(2)}', style: const TextStyle(fontWeight: FontWeight.w600)),
              ],
            ),
            if (makingChargesTotal > 0) ...[
              const SizedBox(height: 8),
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  const Text('Making Charges:'),
                  Text('₹${makingChargesTotal.toStringAsFixed(2)}', style: const TextStyle(fontWeight: FontWeight.w600)),
                ],
              ),
            ],
          ] else ...[
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                const Text('Items Subtotal (Taxable):'),
                Text('₹${itemsSubtotal.toStringAsFixed(2)}', style: const TextStyle(fontWeight: FontWeight.w600)),
              ],
            ),
          ],
          if (discountAmount > 0) ...[
            const SizedBox(height: 8),
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                const Text('Discount:', style: TextStyle(color: Colors.red, fontWeight: FontWeight.w600)),
                Text('- ₹${discountAmount.toStringAsFixed(2)}', style: const TextStyle(fontWeight: FontWeight.bold, color: Colors.red)),
              ],
            ),
          ],
          const SizedBox(height: 8),
          if (isSameState) ...[
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text('CGST (${formatRate(cgstRate)}):', style: TextStyle(color: Colors.grey.shade600)),
                Text('₹${(taxTotal / 2.0).toStringAsFixed(2)}'),
              ],
            ),
            const SizedBox(height: 6),
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text('SGST (${formatRate(sgstRate)}):', style: TextStyle(color: Colors.grey.shade600)),
                Text('₹${(taxTotal / 2.0).toStringAsFixed(2)}'),
              ],
            ),
          ] else ...[
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text('IGST (${formatRate(igstRate)}):', style: TextStyle(color: Colors.grey.shade600)),
                Text('₹${taxTotal.toStringAsFixed(2)}'),
              ],
            ),
          ],
          const Divider(height: 24),
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              const Text('Grand Total:', style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
              Text(
                '₹${grandTotal.toStringAsFixed(2)}',
                style: const TextStyle(fontSize: 22, fontWeight: FontWeight.bold, color: Colors.green),
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget _buildPaymentSection(bool isDark) {
    final wallets = ref.watch(walletProvider).value ?? [];
    final activeWallets = wallets.where((w) => w.nature == 'CASH' || w.nature == 'SAVINGS').toList();

    // Compute grand total for live balance due
    final discountAmount = double.tryParse(_discountCtrl.text) ?? 0.0;
    final products = ref.watch(productsProvider).value ?? [];
    final categories = ref.watch(productCategoriesProvider).value ?? [];
    double rawTaxable = 0;
    double taxTotal = 0;
    for (var item in _items) {
      final product = products.where((p) => p.id == item.productId).firstOrNull;
      final category = categories.where((c) => c.name == item.categoryName || c.id == product?.categoryId).firstOrNull;
      final qtyOrWeight = item.weight != null && item.weight! > 0 ? item.weight! : (item.quantity > 0 ? item.quantity : 1.0);
      final baseAmt = qtyOrWeight * item.unitPrice;
      final isItemCommodity = _isCommodityProduct(category: category, product: product, invoiceItem: item);
      double makingAmt = 0.0;
      if (isItemCommodity) {
        if (item.makingChargesType == 'PERCENTAGE') {
          makingAmt = baseAmt * (item.makingCharge / 100.0);
        } else if (item.makingChargesType == 'PER_PIECE') {
          makingAmt = item.makingCharge;
        } else {
          makingAmt = qtyOrWeight * item.makingCharge;
        }
      }
      final itemTaxable = baseAmt + makingAmt + item.otherCharges - item.discount;
      final itemGstRate = item.taxRate > 0 ? item.taxRate : (product?.gstRate ?? (category?.defaultGst ?? (isItemCommodity ? 3.0 : 18.0)));
      final itemTax = (itemTaxable.clamp(0.0, double.infinity) * itemGstRate) / 100.0;

      rawTaxable += (baseAmt + makingAmt + item.otherCharges);
      taxTotal += itemTax;
    }
    final effectiveTaxable = (rawTaxable - discountAmount).clamp(0.0, double.infinity);
    if (rawTaxable > 0 && discountAmount > 0) {
      taxTotal = taxTotal * (effectiveTaxable / rawTaxable);
    }
    final grandTotal = effectiveTaxable + taxTotal;

    // If user has not manually changed amount paid and grandTotal > 0, auto-track grand total
    if (!_isAmountPaidEdited && grandTotal > 0 && _amountPaidCtrl.text != grandTotal.toStringAsFixed(2)) {
      _amountPaidCtrl.text = grandTotal.toStringAsFixed(2);
    }

    final enteredAmount = double.tryParse(_amountPaidCtrl.text) ?? (_isAmountPaidEdited ? 0.0 : grandTotal);
    final amountPaid = enteredAmount > grandTotal ? grandTotal : enteredAmount;
    final balanceDue = grandTotal - amountPaid;

    Widget? statusBadge;
    if (grandTotal > 0 && (_isAmountPaidEdited || _amountPaidCtrl.text.isNotEmpty)) {
      if (amountPaid >= grandTotal) {
        statusBadge = Container(
          padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
          decoration: BoxDecoration(
            color: Colors.green.withValues(alpha: 0.15),
            borderRadius: BorderRadius.circular(6),
          ),
          child: const Text(
            'Fully Paid',
            style: TextStyle(fontSize: 11, fontWeight: FontWeight.bold, color: Colors.green),
          ),
        );
      } else if (amountPaid > 0) {
        statusBadge = Container(
          padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
          decoration: BoxDecoration(
            color: Colors.orange.withValues(alpha: 0.15),
            borderRadius: BorderRadius.circular(6),
          ),
          child: const Text(
            'Partial Payment',
            style: TextStyle(fontSize: 11, fontWeight: FontWeight.bold, color: Colors.orange),
          ),
        );
      } else {
        statusBadge = Container(
          padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
          decoration: BoxDecoration(
            color: Colors.red.withValues(alpha: 0.15),
            borderRadius: BorderRadius.circular(6),
          ),
          child: const Text(
            'Unpaid',
            style: TextStyle(fontSize: 11, fontWeight: FontWeight.bold, color: Colors.red),
          ),
        );
      }
    }

    return Container(
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        color: isDark ? const Color(0xFF1E293B) : Colors.white,
        borderRadius: BorderRadius.circular(20),
        border: Border.all(color: isDark ? Colors.white12 : Colors.grey.shade200),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              const Text('PAYMENT & SETTLEMENT', style: TextStyle(fontSize: 12, fontWeight: FontWeight.bold, letterSpacing: 0.8, color: Colors.grey)),
              if (statusBadge != null)
                Flexible(child: statusBadge),
            ],
          ),
          const SizedBox(height: 16),
          Row(
            children: [
              Expanded(
                child: PremiumTextField(
                  controller: _amountPaidCtrl,
                  labelText: 'Amount Received (₹)',
                  keyboardType: const TextInputType.numberWithOptions(decimal: true),
                  prefixIcon: const Icon(LucideIcons.indianRupee),
                  onChanged: (val) {
                    setState(() => _isAmountPaidEdited = true);
                  },
                ),
              ),
              const SizedBox(width: 12),
              Expanded(
                child: DropdownButtonFormField<String>(
                  value: _paymentMethod,
                  decoration: InputDecoration(
                    labelText: 'Method',
                    border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
                  ),
                  items: const [
                    DropdownMenuItem(value: 'Cash', child: Text('Cash')),
                    DropdownMenuItem(value: 'UPI', child: Text('UPI / QR')),
                    DropdownMenuItem(value: 'Bank Transfer', child: Text('Bank Transfer')),
                    DropdownMenuItem(value: 'Card', child: Text('Card')),
                  ],
                  onChanged: (val) => setState(() => _paymentMethod = val!),
                ),
              ),
            ],
          ),
          const SizedBox(height: 14),
          if (activeWallets.isNotEmpty)
            DropdownButtonFormField<int>(
              value: _selectedWalletId ?? activeWallets.first.id,
              decoration: InputDecoration(
                labelText: 'Deposit To Account',
                prefixIcon: const Icon(LucideIcons.wallet),
                border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
              ),
              items: activeWallets.map((w) => DropdownMenuItem(
                value: w.id,
                child: Text('${w.name} (₹${w.balance.toStringAsFixed(0)})'),
              )).toList(),
              onChanged: (val) => setState(() => _selectedWalletId = val),
            ),
          
          if (balanceDue > 0) ...[
            const SizedBox(height: 14),
            Container(
              padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
              decoration: BoxDecoration(
                color: (amountPaid > 0 ? Colors.orange : Colors.red).withValues(alpha: 0.08),
                borderRadius: BorderRadius.circular(12),
                border: Border.all(color: (amountPaid > 0 ? Colors.orange : Colors.red).withValues(alpha: 0.25)),
              ),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  Row(
                    children: [
                      Icon(
                        amountPaid > 0 ? LucideIcons.circleDot : LucideIcons.alertCircle,
                        size: 16,
                        color: amountPaid > 0 ? Colors.orange : Colors.red,
                      ),
                      const SizedBox(width: 8),
                      Text(
                        amountPaid > 0 ? 'Remaining Balance Due:' : 'Total Amount Due:',
                        style: TextStyle(
                          fontSize: 13,
                          fontWeight: FontWeight.w600,
                          color: isDark ? Colors.white70 : Colors.black87,
                        ),
                      ),
                    ],
                  ),
                  Text(
                    '₹${balanceDue.toStringAsFixed(2)}',
                    style: TextStyle(
                      fontSize: 15,
                      fontWeight: FontWeight.bold,
                      color: amountPaid > 0 ? Colors.orange.shade700 : Colors.red.shade700,
                    ),
                  ),
                ],
              ),
            ),
            const SizedBox(height: 14),
            InkWell(
              onTap: () async {
                final picked = await showDatePicker(
                  context: context,
                  initialDate: _nextPaymentDate ?? DateTime.now().add(const Duration(days: 30)),
                  firstDate: DateTime.now(),
                  lastDate: DateTime(2100),
                );
                if (picked != null) {
                  setState(() => _nextPaymentDate = picked);
                }
              },
              child: InputDecorator(
                decoration: InputDecoration(
                  labelText: 'Next Due / Balance Settlement Date',
                  prefixIcon: const Icon(LucideIcons.calendarClock),
                  border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
                ),
                child: Text(
                  _nextPaymentDate != null ? DateFormat('dd MMM yyyy').format(_nextPaymentDate!) : 'Select Settlement Date (Default: 30 Days)',
                  style: const TextStyle(fontWeight: FontWeight.w600, fontSize: 13),
                ),
              ),
            ),
          ],

          const Divider(height: 28),

          // EMI Option Toggle
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              const Row(
                children: [
                  Icon(LucideIcons.creditCard, size: 18, color: Colors.purple),
                  SizedBox(width: 8),
                  Text('Enable EMI Installments', style: TextStyle(fontWeight: FontWeight.bold, fontSize: 14)),
                ],
              ),
              Switch(
                value: _isEmi,
                activeColor: Colors.purple,
                onChanged: (val) => setState(() => _isEmi = val),
              ),
            ],
          ),

          if (_isEmi) ...[
            const SizedBox(height: 12),
            Row(
              children: [
                Expanded(
                  child: PremiumTextField(
                    controller: _emiAmountCtrl,
                    labelText: 'EMI Amount (₹)',
                    keyboardType: const TextInputType.numberWithOptions(decimal: true),
                    prefixIcon: const Icon(LucideIcons.indianRupee),
                  ),
                ),
                const SizedBox(width: 12),
                Expanded(
                  child: DropdownButtonFormField<String>(
                    value: _emiCycle,
                    decoration: InputDecoration(
                      labelText: 'Cycle',
                      border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
                    ),
                    items: const [
                      DropdownMenuItem(value: 'MONTHLY', child: Text('Monthly')),
                      DropdownMenuItem(value: 'WEEKLY', child: Text('Weekly')),
                    ],
                    onChanged: (val) => setState(() => _emiCycle = val!),
                  ),
                ),
              ],
            ),
          ],
        ],
      ),
    );
  }

  Future<void> _scanTrackingBarcode() async {
    final code = await Navigator.push<String>(
      context,
      MaterialPageRoute(builder: (_) => const BarcodeScannerScreen()),
    );
    if (code != null && code.isNotEmpty) {
      setState(() {
        _trackingNumberCtrl.text = code.trim();
        if (_dispatchStatus == 'PENDING') {
          _dispatchStatus = 'SHIPPED';
          _shippedAt = DateTime.now();
        }
      });
    }
  }

  Widget _buildShippingLogisticsSection(bool isDark) {
    final customers = ref.watch(customersProvider).value ?? [];
    final customer = _selectedCustomerId == null 
        ? null 
        : customers.where((c) => c.id == _selectedCustomerId).firstOrNull;

    final courierSuggestions = [
      'Delhivery',
      'BlueDart',
      'Shiprocket',
      'DTDC',
      'India Post',
      'Amazon Shipping',
      'Ekart',
      'Shadowfax',
      'Direct / Hand Delivery',
    ];

    final dispatchStatuses = [
      {'status': 'PENDING', 'label': 'Pending', 'color': Colors.grey},
      {'status': 'PACKED', 'label': 'Packed', 'color': Colors.blue},
      {'status': 'SHIPPED', 'label': 'Shipped', 'color': Colors.indigo},
      {'status': 'IN_TRANSIT', 'label': 'In Transit', 'color': Colors.amber.shade800},
      {'status': 'DELIVERED', 'label': 'Delivered', 'color': Colors.green},
      {'status': 'RTO', 'label': 'RTO / Return', 'color': Colors.red},
    ];

    return Container(
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        color: isDark ? const Color(0xFF1E293B) : Colors.white,
        borderRadius: BorderRadius.circular(20),
        border: Border.all(color: isDark ? Colors.white12 : Colors.grey.shade200),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withValues(alpha: isDark ? 0.2 : 0.05),
            blurRadius: 15,
            offset: const Offset(0, 5),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Row(
                children: [
                  Container(
                    padding: const EdgeInsets.all(6),
                    decoration: BoxDecoration(
                      color: Colors.indigo.withValues(alpha: 0.12),
                      borderRadius: BorderRadius.circular(8),
                    ),
                    child: const Icon(LucideIcons.truck, size: 16, color: Colors.indigo),
                  ),
                  const SizedBox(width: 8),
                  const Text(
                    'SHIPPING & COURIER LOGISTICS',
                    style: TextStyle(fontSize: 12, fontWeight: FontWeight.bold, letterSpacing: 0.8, color: Colors.grey),
                  ),
                ],
              ),
              Container(
                padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
                decoration: BoxDecoration(
                  color: Colors.indigo.withValues(alpha: 0.1),
                  borderRadius: BorderRadius.circular(6),
                  border: Border.all(color: Colors.indigo.withValues(alpha: 0.3)),
                ),
                child: Text(
                  _dispatchStatus,
                  style: const TextStyle(fontSize: 10, fontWeight: FontWeight.bold, color: Colors.indigo),
                ),
              ),
            ],
          ),
          const SizedBox(height: 16),

          // Dispatch Status Selector
          const Text('Dispatch Status:', style: TextStyle(fontSize: 12, fontWeight: FontWeight.bold, color: Colors.grey)),
          const SizedBox(height: 6),
          SingleChildScrollView(
            scrollDirection: Axis.horizontal,
            child: Row(
              children: dispatchStatuses.map((st) {
                final statusKey = st['status'] as String;
                final statusLabel = st['label'] as String;
                final statusColor = st['color'] as Color;
                final isSelected = _dispatchStatus == statusKey;

                return Padding(
                  padding: const EdgeInsets.only(right: 8.0),
                  child: ChoiceChip(
                    label: Text(
                      statusLabel,
                      style: TextStyle(
                        fontSize: 12,
                        fontWeight: isSelected ? FontWeight.bold : FontWeight.normal,
                        color: isSelected ? Colors.white : (isDark ? Colors.white70 : Colors.black87),
                      ),
                    ),
                    selected: isSelected,
                    selectedColor: statusColor,
                    backgroundColor: isDark ? const Color(0xFF0F172A) : Colors.grey.shade100,
                    onSelected: (selected) {
                      if (selected) {
                        setState(() {
                          _dispatchStatus = statusKey;
                          if (statusKey == 'SHIPPED' && _shippedAt == null) {
                            _shippedAt = DateTime.now();
                          }
                        });
                      }
                    },
                  ),
                );
              }).toList(),
            ),
          ),
          const SizedBox(height: 14),

          // Courier Partner & Quick Selection Chips
          Row(
            children: [
              Expanded(
                child: PremiumTextField(
                  controller: _courierPartnerCtrl,
                  labelText: 'Courier Partner (e.g. Delhivery, BlueDart)',
                  prefixIcon: const Icon(LucideIcons.packageCheck),
                ),
              ),
            ],
          ),
          const SizedBox(height: 6),
          SingleChildScrollView(
            scrollDirection: Axis.horizontal,
            child: Row(
              children: courierSuggestions.map((name) {
                final isCurrent = _courierPartnerCtrl.text.trim().toLowerCase() == name.toLowerCase();
                return Padding(
                  padding: const EdgeInsets.only(right: 6.0),
                  child: ActionChip(
                    padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 0),
                    label: Text(name, style: TextStyle(fontSize: 11, color: isCurrent ? Colors.blue : null)),
                    backgroundColor: isCurrent ? Colors.blue.withValues(alpha: 0.15) : null,
                    onPressed: () {
                      setState(() {
                        _courierPartnerCtrl.text = name;
                      });
                    },
                  ),
                );
              }).toList(),
            ),
          ),
          const SizedBox(height: 14),

          // AWB / Tracking Number with Scanner Button
          Row(
            children: [
              Expanded(
                child: PremiumTextField(
                  controller: _trackingNumberCtrl,
                  labelText: 'AWB / Tracking Number',
                  prefixIcon: const Icon(LucideIcons.barcode),
                ),
              ),
              const SizedBox(width: 8),
              IconButton.filledTonal(
                icon: const Icon(LucideIcons.scanLine),
                tooltip: 'Scan AWB Barcode',
                onPressed: _scanTrackingBarcode,
              ),
            ],
          ),
          const SizedBox(height: 14),

          // Delivery Address Toggle & Form
          CheckboxListTile(
            contentPadding: EdgeInsets.zero,
            dense: true,
            title: const Text('Deliver to customer billing address', style: TextStyle(fontWeight: FontWeight.w600)),
            subtitle: Text(
              customer?.address != null && customer!.address!.isNotEmpty
                  ? customer.address!
                  : 'Customer address on file',
              style: TextStyle(fontSize: 11, color: Colors.grey.shade600),
              maxLines: 1,
              overflow: TextOverflow.ellipsis,
            ),
            value: _sameAsCustomerAddress,
            onChanged: (val) {
              setState(() => _sameAsCustomerAddress = val ?? true);
            },
          ),
          if (!_sameAsCustomerAddress) ...[
            const SizedBox(height: 8),
            PremiumTextField(
              controller: _shippingAddressCtrl,
              labelText: 'Shipping / Delivery Address',
              maxLines: 2,
              prefixIcon: const Icon(LucideIcons.mapPin),
            ),
            const SizedBox(height: 10),
            PremiumTextField(
              controller: _shippingPincodeCtrl,
              labelText: 'Shipping Pincode',
              keyboardType: TextInputType.number,
              prefixIcon: const Icon(LucideIcons.hash),
            ),
          ],
        ],
      ),
    );
  }
}

class _AddSalesItemSheet extends ConsumerStatefulWidget {
  final ValueChanged<InvoiceItem> onItemAdded;
  final InvoiceItem? initialItem;

  const _AddSalesItemSheet({
    required this.onItemAdded,
    this.initialItem,
  });

  @override
  ConsumerState<_AddSalesItemSheet> createState() => _AddSalesItemSheetState();
}

class _AddSalesItemSheetState extends ConsumerState<_AddSalesItemSheet> {
  final _searchCtrl = TextEditingController();
  Product? _selectedProduct;
  InventoryItem? _selectedInventoryItem;
  double _selectedProductAvailableStock = 0.0;

  final _unitPriceCtrl = TextEditingController();
  final _quantityCtrl = TextEditingController(text: '1');
  final _weightCtrl = TextEditingController(text: '1.000');
  final _makingChargeCtrl = TextEditingController(text: '0.0');
  String _makingChargeType = 'PER_GRAM';
  final _discountCtrl = TextEditingController(text: '0.0');

  @override
  void initState() {
    super.initState();
    Future.microtask(() => ref.invalidate(inventoryItemsProvider));
    if (widget.initialItem != null) {
      final it = widget.initialItem!;
      _makingChargeCtrl.text = it.makingCharge.toStringAsFixed(2);
      _makingChargeType = it.makingChargesType ?? 'PER_GRAM';
      _discountCtrl.text = it.discount.toStringAsFixed(2);
      _unitPriceCtrl.text = it.unitPrice.toStringAsFixed(2);
      _quantityCtrl.text = (it.quantity > 0 ? it.quantity : 1.0).toStringAsFixed(it.quantity.truncateToDouble() == it.quantity ? 0 : 2);
      _weightCtrl.text = (it.weight ?? 1.0).toStringAsFixed(3);

      WidgetsBinding.instance.addPostFrameCallback((_) {
        final products = ref.read(productsProvider).value ?? [];
        final invItems = ref.read(inventoryItemsProvider).value ?? [];
        setState(() {
          _selectedProduct = products.where((p) => p.id == it.productId).firstOrNull ??
              Product(
                id: it.productId,
                name: it.productName ?? 'Item',
                sku: it.sku,
                hsnCode: it.hsnCode,
                gstRate: it.taxRate,
                sellingPrice: it.unitPrice,
                makingCharges: it.makingCharge,
                makingChargesType: it.makingChargesType,
              );
          if (it.inventoryItemId != null) {
            _selectedInventoryItem = invItems.where((i) => i.id == it.inventoryItemId).firstOrNull;
          }
        });
      });
    }
  }

  @override
  void dispose() {
    _searchCtrl.dispose();
    _unitPriceCtrl.dispose();
    _quantityCtrl.dispose();
    _weightCtrl.dispose();
    _makingChargeCtrl.dispose();
    _discountCtrl.dispose();
    super.dispose();
  }

  void _onProductSelected(
    Product product,
    ProductCategory? category,
    double liveCommodityRate,
    bool isCommodity, {
    double? avgPrice,
    double? availableStock,
  }) {
    setState(() {
      _selectedProduct = product;
      _selectedInventoryItem = null;
      _selectedProductAvailableStock = availableStock ?? product.currentStock ?? 0.0;
      final resolvedPrice = (avgPrice != null && avgPrice > 0)
          ? avgPrice
          : (product.sellingPrice ?? 0.0);
      _unitPriceCtrl.text = resolvedPrice > 0 ? resolvedPrice.toStringAsFixed(2) : '';
      _quantityCtrl.text = '1';
      _weightCtrl.text = '1.000';
      
      if (product.makingCharges != null && product.makingCharges! > 0) {
        _makingChargeCtrl.text = product.makingCharges!.toStringAsFixed(2);
        _makingChargeType = product.makingChargesType ?? (category?.makingChargeType ?? 'PER_GRAM');
      } else if (category?.defaultMakingCharge != null && category!.defaultMakingCharge! > 0) {
        _makingChargeCtrl.text = category.defaultMakingCharge!.toStringAsFixed(2);
        _makingChargeType = category.makingChargeType ?? 'PER_GRAM';
      } else {
        _makingChargeCtrl.text = '0.0';
        _makingChargeType = category?.makingChargeType ?? 'PER_GRAM';
      }
    });
  }

  void _onInventoryItemSelected(InventoryItem item, Product product, ProductCategory? category, bool isCommodity) {
    setState(() {
      _selectedProduct = product;
      _selectedInventoryItem = item;
      _selectedProductAvailableStock = item.grossWeight ?? item.netWeight ?? 1.0;
      final resolvedPrice = item.saleRate ?? product.sellingPrice ?? 0.0;
      _unitPriceCtrl.text = resolvedPrice > 0 ? resolvedPrice.toStringAsFixed(2) : '';
      _quantityCtrl.text = '1';
      _weightCtrl.text = (item.grossWeight ?? 1.0).toStringAsFixed(3);

      if (item.makingCharges != null && item.makingCharges! > 0) {
        _makingChargeCtrl.text = item.makingCharges!.toStringAsFixed(2);
        _makingChargeType = item.makingChargeType ?? 'PER_GRAM';
      } else if (product.makingCharges != null && product.makingCharges! > 0) {
        _makingChargeCtrl.text = product.makingCharges!.toStringAsFixed(2);
        _makingChargeType = product.makingChargesType ?? (category?.makingChargeType ?? 'PER_GRAM');
      } else if (category?.defaultMakingCharge != null && category!.defaultMakingCharge! > 0) {
        _makingChargeCtrl.text = category.defaultMakingCharge!.toStringAsFixed(2);
        _makingChargeType = category.makingChargeType ?? 'PER_GRAM';
      } else {
        _makingChargeCtrl.text = '0.0';
        _makingChargeType = category?.makingChargeType ?? 'PER_GRAM';
      }
    });
  }

  Future<void> _scanBarcodeInSheet() async {
    final scanned = await Navigator.push<String>(
      context,
      MaterialPageRoute(builder: (_) => const BarcodeScannerScreen()),
    );
    if (scanned != null && scanned.isNotEmpty) {
      _searchCtrl.text = scanned;
      setState(() {});
    }
  }

  void _submitItem(ProductCategory? category, double unitRate, bool isCommodity, String uomUnit) {
    if (_selectedProduct == null) return;

    final discount = double.tryParse(_discountCtrl.text) ?? 0.0;
    final gstRate = _selectedProduct?.gstRate ?? (category?.defaultGst ?? (isCommodity ? 3.0 : 18.0));

    double effectivePrice = unitRate;
    double qty = 1.0;
    double? weight;
    double makingCharge = 0.0;
    String makingType = 'PER_PIECE';
    double lineTaxable = 0.0;
    double taxAmount = 0.0;
    double total = 0.0;

    if (isCommodity) {
      weight = double.tryParse(_weightCtrl.text) ?? (_selectedInventoryItem?.grossWeight ?? 1.0);
      qty = 1.0;
      effectivePrice = unitRate;
      makingCharge = double.tryParse(_makingChargeCtrl.text) ?? 0.0;
      makingType = _makingChargeType;

      final metalAmount = weight * effectivePrice;
      double makingAmt = 0.0;
      if (makingType == 'PERCENTAGE') {
        makingAmt = metalAmount * (makingCharge / 100.0);
      } else if (makingType == 'PER_PIECE') {
        makingAmt = makingCharge;
      } else {
        makingAmt = weight * makingCharge;
      }

      lineTaxable = metalAmount + makingAmt - discount;
      taxAmount = (lineTaxable.clamp(0.0, double.infinity) * gstRate) / 100.0;
      total = lineTaxable.clamp(0.0, double.infinity) + taxAmount;
    } else {
      effectivePrice = double.tryParse(_unitPriceCtrl.text) ?? (_selectedProduct?.sellingPrice ?? unitRate);
      qty = double.tryParse(_quantityCtrl.text) ?? 1.0;
      weight = null;
      makingCharge = 0.0;
      makingType = 'PER_PIECE';

      lineTaxable = (qty * effectivePrice) - discount;
      taxAmount = (lineTaxable.clamp(0.0, double.infinity) * gstRate) / 100.0;
      total = lineTaxable.clamp(0.0, double.infinity) + taxAmount;
    }

    final item = InvoiceItem(
      productId: _selectedProduct!.id,
      inventoryItemId: _selectedInventoryItem?.id,
      productName: _selectedProduct!.name,
      categoryName: category?.name,
      commodityCode: isCommodity ? category?.commodityCode : null,
      hsnCode: category?.defaultHsn ?? _selectedProduct?.hsnCode,
      sku: _selectedInventoryItem?.sku ?? _selectedProduct?.sku,
      huid: isCommodity ? _selectedInventoryItem?.huid : null,
      description: _selectedProduct!.name,
      quantity: qty,
      weight: weight,
      unitPrice: effectivePrice,
      makingCharge: makingCharge,
      makingChargesType: makingType,
      taxRate: gstRate,
      discount: discount,
      photoUrl: _selectedInventoryItem?.tagNumber,
      total: total,
    );

    widget.onItemAdded(item);
    Navigator.pop(context);
  }

  @override
  Widget build(BuildContext context) {
    final products = ref.watch(productsProvider).value ?? [];
    final categories = ref.watch(productCategoriesProvider).value ?? [];
    final commodityRates = ref.watch(commodityRatesProvider).value ?? [];
    final inventoryItems = ref.watch(inventoryItemsProvider).value ?? [];
    final uoms = ref.watch(uomsProvider).value ?? [];

    final businessProfile = ref.watch(businessProfileProvider).value;
    final nature = (businessProfile?.natureOfBusiness ?? businessProfile?.industry ?? 'JEWELLERY').toUpperCase();
    final isJewellery = nature == 'JEWELLERY';

    final isDark = Theme.of(context).brightness == Brightness.dark;

    ProductCategory? category;
    if (_selectedProduct?.categoryId != null) {
      category = categories.where((c) => c.id == _selectedProduct!.categoryId).firstOrNull;
    }

    final isCommodity = _isCommodityProduct(
      category: category,
      product: _selectedProduct,
      inventoryItem: _selectedInventoryItem,
    );
    final uomUnit = _resolveProductUnit(product: _selectedProduct, category: category, uoms: uoms, isCommodity: isCommodity);

    double commodityRate = 0.0;
    if (category?.commodityCode != null) {
      final match = commodityRates.where((r) => r.commodityCode.toUpperCase() == category!.commodityCode!.toUpperCase()).firstOrNull;
      if (match != null) {
        commodityRate = match.rate;
      }
    }
    final purityFactor = resolvePurity(categoryPurity: category?.purityFactor, productPurity: _selectedProduct?.purityFactor);
    final effectiveUnitRate = isCommodity
        ? (commodityRate > 0 ? (commodityRate * purityFactor) : (_selectedProduct?.sellingPrice ?? 0.0))
        : (double.tryParse(_unitPriceCtrl.text) ?? (_selectedProduct?.sellingPrice ?? 0.0));

    final weight = double.tryParse(_weightCtrl.text) ?? (_selectedInventoryItem?.grossWeight ?? 1.0);
    final quantity = double.tryParse(_quantityCtrl.text) ?? 1.0;
    final discount = double.tryParse(_discountCtrl.text) ?? 0.0;
    final gstRate = _selectedProduct?.gstRate ?? (category?.defaultGst ?? (isCommodity ? 3.0 : 18.0));

    double taxable = 0.0;
    double makingAmt = 0.0;
    double metalAmount = 0.0;

    if (isCommodity) {
      metalAmount = weight * effectiveUnitRate;
      final makingCharge = double.tryParse(_makingChargeCtrl.text) ?? 0.0;
      if (_makingChargeType == 'PERCENTAGE') {
        makingAmt = metalAmount * (makingCharge / 100.0);
      } else if (_makingChargeType == 'PER_PIECE') {
        makingAmt = makingCharge;
      } else {
        makingAmt = weight * makingCharge;
      }
      taxable = (metalAmount + makingAmt - discount).clamp(0.0, double.infinity);
    } else {
      final subtotal = quantity * effectiveUnitRate;
      taxable = (subtotal - discount).clamp(0.0, double.infinity);
    }

    final taxAmount = (taxable * gstRate) / 100.0;
    final total = taxable + taxAmount;

    final query = _searchCtrl.text.trim().toLowerCase();
    final availableItems = inventoryItems
        .where((item) => item.status == null || item.status == 'AVAILABLE')
        .toList();

    availableItems.sort((a, b) {
      if (a.createdAt == null && b.createdAt == null) return 0;
      if (a.createdAt == null) return 1;
      if (b.createdAt == null) return -1;
      return b.createdAt!.compareTo(a.createdAt!);
    });

    final List<InventoryItem> displayInventoryItems;
    if (query.isEmpty) {
      displayInventoryItems = availableItems.take(20).toList();
    } else {
      displayInventoryItems = availableItems.where((item) {
        final p = products.where((pr) => pr.id == item.productId).firstOrNull;
        final cat = p != null ? categories.where((c) => c.id == p.categoryId).firstOrNull : null;
        
        final matchesHuid = item.huid != null && item.huid!.toLowerCase().contains(query);
        final matchesSku = (item.sku != null && item.sku!.toLowerCase().contains(query)) ||
            (p?.sku != null && p!.sku!.toLowerCase().contains(query));
        final matchesName = p != null && p.name.toLowerCase().contains(query);
        final matchesBarcode = p != null && p.barcode != null && p.barcode!.toLowerCase().contains(query);
        final matchesCategory = cat != null && cat.name.toLowerCase().contains(query);
        final matchesTag = item.tagNumber != null && item.tagNumber!.toLowerCase().contains(query);

        return matchesHuid || matchesSku || matchesName || matchesBarcode || matchesCategory || matchesTag;
      }).take(20).toList();
    }

    final matchingProductIdsInInv = displayInventoryItems.map((i) => i.productId).toSet();
    final directProducts = products.where((p) {
      if (matchingProductIdsInInv.contains(p.id)) return false;
      if (query.isEmpty) return true;
      final q = query.toLowerCase();
      final cat = categories.where((c) => c.id == p.categoryId).firstOrNull;
      return p.name.toLowerCase().contains(q) ||
          (p.sku != null && p.sku!.toLowerCase().contains(q)) ||
          (p.barcode != null && p.barcode!.toLowerCase().contains(q)) ||
          (cat != null && cat.name.toLowerCase().contains(q));
    }).take(20).toList();

    final matchedProducts = products.where((p) {
      if (query.isEmpty) return true;
      final cat = categories.where((c) => c.id == p.categoryId).firstOrNull;
      return p.name.toLowerCase().contains(query) ||
          (p.sku != null && p.sku!.toLowerCase().contains(query)) ||
          (p.barcode != null && p.barcode!.toLowerCase().contains(query)) ||
          (cat != null && cat.name.toLowerCase().contains(query));
    }).toList();

    final keyboardHeight = MediaQuery.of(context).viewInsets.bottom;

    return AnimatedPadding(
      padding: EdgeInsets.only(bottom: keyboardHeight),
      duration: const Duration(milliseconds: 150),
      curve: Curves.easeOut,
      child: GestureDetector(
        onTap: () => FocusScope.of(context).unfocus(),
        behavior: HitTestBehavior.translucent,
        child: Container(
          height: MediaQuery.of(context).size.height * 0.88,
          decoration: BoxDecoration(
            color: Theme.of(context).scaffoldBackgroundColor,
            borderRadius: const BorderRadius.vertical(top: Radius.circular(28)),
          ),
          child: Column(
            children: [
              Center(
                child: Container(
                  margin: const EdgeInsets.only(top: 12, bottom: 8),
                  width: 40,
                  height: 4,
                  decoration: BoxDecoration(
                    color: Colors.grey.withValues(alpha: 0.4),
                    borderRadius: BorderRadius.circular(2),
                  ),
                ),
              ),
              Padding(
                padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 8),
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    const Text('Add Item to Invoice', style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
                    Row(
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        if (keyboardHeight > 0)
                          TextButton.icon(
                            style: TextButton.styleFrom(
                              backgroundColor: Colors.blue.withValues(alpha: 0.12),
                              padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
                              shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
                            ),
                            icon: const Icon(LucideIcons.keyboard, size: 16, color: Colors.blue),
                            label: const Text('Done', style: TextStyle(fontWeight: FontWeight.bold, color: Colors.blue)),
                            onPressed: () => FocusScope.of(context).unfocus(),
                          ),
                        IconButton(
                          icon: const Icon(LucideIcons.x, size: 20),
                          onPressed: () => Navigator.pop(context),
                        ),
                      ],
                    ),
                  ],
                ),
              ),
              const Divider(height: 1),

              // Keyboard Toolbar when active on iOS/Android
              if (keyboardHeight > 0)
                Container(
                  color: isDark ? const Color(0xFF1E293B) : Colors.grey.shade100,
                  padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 6),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: [
                      Text(
                        'Editing ${_selectedProduct?.name ?? 'Item'}',
                        style: TextStyle(fontSize: 12, color: Colors.grey.shade600, fontWeight: FontWeight.w500),
                      ),
                      TextButton.icon(
                        style: TextButton.styleFrom(
                          padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 4),
                          backgroundColor: Colors.blue,
                          foregroundColor: Colors.white,
                          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
                        ),
                        icon: const Icon(LucideIcons.check, size: 15),
                        label: const Text('Done / Dismiss', style: TextStyle(fontWeight: FontWeight.bold, fontSize: 13)),
                        onPressed: () => FocusScope.of(context).unfocus(),
                      ),
                    ],
                  ),
                ),

              Expanded(
                child: ListView(
                  keyboardDismissBehavior: ScrollViewKeyboardDismissBehavior.onDrag,
                  padding: const EdgeInsets.fromLTRB(20, 16, 20, 40),
                  children: [
                // Search Input with Barcode Action & Rounded Borders
                TextField(
                  controller: _searchCtrl,
                  decoration: InputDecoration(
                    labelText: isJewellery
                        ? 'Search Product by HUID / Name / SKU / Barcode'
                        : 'Search Product by Name / SKU / Barcode',
                    prefixIcon: const Icon(LucideIcons.search),
                    suffixIcon: Row(
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        if (_searchCtrl.text.isNotEmpty)
                          IconButton(
                            icon: const Icon(LucideIcons.x),
                            onPressed: () => setState(() => _searchCtrl.clear()),
                          ),
                        IconButton(
                          icon: const Icon(LucideIcons.qrCode, color: Colors.blue),
                          tooltip: 'Scan Barcode',
                          onPressed: _scanBarcodeInSheet,
                        ),
                      ],
                    ),
                    border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
                  ),
                  onChanged: (val) => setState(() {}),
                ),
                const SizedBox(height: 12),

                if (_selectedProduct == null) ...[
                  Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: [
                      Text(
                        !isJewellery
                            ? (query.isEmpty ? 'Available Products in Catalog (${matchedProducts.length}):' : 'Matched Products (${matchedProducts.length}):')
                            : (query.isEmpty ? 'Available Stock in Inventory (${displayInventoryItems.length + directProducts.length}):' : 'Matched Items (${displayInventoryItems.length + directProducts.length}):'),
                        style: TextStyle(
                          fontSize: 12,
                          fontWeight: FontWeight.bold,
                          color: isDark ? Colors.grey.shade400 : Colors.grey.shade700,
                        ),
                      ),
                    ],
                  ),
                  const SizedBox(height: 10),
                  if (!isJewellery) ...[
                    // NON-JEWELLERY MODULE: Show List of Unique Products with Weighted Avg Price & Aggregated Available Stock
                    if (matchedProducts.isEmpty)
                      Padding(
                        padding: const EdgeInsets.symmetric(vertical: 40.0),
                        child: Center(
                          child: Column(
                            mainAxisSize: MainAxisSize.min,
                            children: [
                              Icon(LucideIcons.packageOpen, size: 40, color: Colors.grey.shade400),
                              const SizedBox(height: 10),
                              Text(
                                query.isEmpty
                                    ? 'No products available in catalog'
                                    : 'No matching products found',
                                style: TextStyle(color: Colors.grey.shade500, fontSize: 14),
                              ),
                            ],
                          ),
                        ),
                      )
                    else ...[
                      ...matchedProducts.map((p) {
                        final cat = categories.where((c) => c.id == p.categoryId).firstOrNull;
                        final itemUom = _resolveProductUnit(product: p, category: cat, uoms: uoms, isCommodity: false);

                        // Find all available batches for this product in inventory
                        final pBatches = availableItems.where((i) => i.productId == p.id).toList();

                        double totalAvailableStock = 0.0;
                        double totalCostOrPrice = 0.0;
                        for (var batch in pBatches) {
                          final qty = (batch.grossWeight != null && batch.grossWeight! > 0)
                              ? batch.grossWeight!
                              : ((batch.netWeight != null && batch.netWeight! > 0) ? batch.netWeight! : 1.0);
                          final rate = (batch.saleRate != null && batch.saleRate! > 0)
                              ? batch.saleRate!
                              : (batch.purchaseCost != null && batch.purchaseCost! > 0 ? batch.purchaseCost! : (p.sellingPrice ?? 0.0));
                          totalAvailableStock += qty;
                          totalCostOrPrice += (qty * rate);
                        }

                        if (pBatches.isEmpty && (p.currentStock != null && p.currentStock! > 0)) {
                          totalAvailableStock = p.currentStock!;
                          totalCostOrPrice = totalAvailableStock * (p.sellingPrice ?? 0.0);
                        }

                        final avgPrice = totalAvailableStock > 0
                            ? (totalCostOrPrice / totalAvailableStock)
                            : (p.sellingPrice ?? 0.0);

                        return _buildProductSearchCard(
                          product: p,
                          category: cat,
                          availableStock: totalAvailableStock,
                          avgPrice: avgPrice,
                          uomUnit: itemUom,
                          isDark: isDark,
                          onTap: () => _onProductSelected(
                            p,
                            cat,
                            0.0,
                            false,
                            avgPrice: avgPrice,
                            availableStock: totalAvailableStock,
                          ),
                        );
                      }),
                    ],
                  ] else ...[
                    // JEWELLERY MODULE: Show Serialized Inventory Items (HUID, Tag No, Purity, Gross Weight)
                    if (displayInventoryItems.isEmpty && directProducts.isEmpty)
                      Padding(
                        padding: const EdgeInsets.symmetric(vertical: 40.0),
                        child: Center(
                          child: Column(
                            mainAxisSize: MainAxisSize.min,
                            children: [
                              Icon(LucideIcons.packageOpen, size: 40, color: Colors.grey.shade400),
                              const SizedBox(height: 10),
                              Text(
                                query.isEmpty
                                    ? 'No items available in stock'
                                    : 'No matching items found',
                                style: TextStyle(color: Colors.grey.shade500, fontSize: 14),
                              ),
                            ],
                          ),
                        ),
                      )
                    else ...[
                      ...displayInventoryItems.map((item) {
                        final p = products.where((pr) => pr.id == item.productId).firstOrNull ??
                            Product(
                              id: item.productId,
                              name: item.sku ?? 'Inventory Item',
                              sku: item.sku,
                            );
                        final cat = categories.where((c) => c.id == p.categoryId).firstOrNull;
                        final itemIsCommodity = _isCommodityProduct(category: cat, product: p, inventoryItem: item);
                        final itemUom = _resolveProductUnit(product: p, category: cat, uoms: uoms, isCommodity: itemIsCommodity);

                        double commRate = 0.0;
                        if (cat?.commodityCode != null) {
                          final m = commodityRates.where((r) => r.commodityCode.toUpperCase() == cat!.commodityCode!.toUpperCase()).firstOrNull;
                          if (m != null) commRate = m.rate;
                        }
                        return _buildSearchItemCard(
                          product: p,
                          category: cat,
                          inventoryItem: item,
                          commodityRate: commRate,
                          isCommodity: itemIsCommodity,
                          uomUnit: itemUom,
                          isDark: isDark,
                          onTap: () => _onInventoryItemSelected(item, p, cat, itemIsCommodity),
                        );
                      }),
                      ...directProducts.map((p) {
                        final cat = categories.where((c) => c.id == p.categoryId).firstOrNull;
                        final itemIsCommodity = _isCommodityProduct(category: cat, product: p);
                        final itemUom = _resolveProductUnit(product: p, category: cat, uoms: uoms, isCommodity: itemIsCommodity);

                        double commRate = 0.0;
                        if (cat?.commodityCode != null) {
                          final m = commodityRates.where((r) => r.commodityCode.toUpperCase() == cat!.commodityCode!.toUpperCase()).firstOrNull;
                          if (m != null) commRate = m.rate;
                        }
                        return _buildSearchItemCard(
                          product: p,
                          category: cat,
                          inventoryItem: null,
                          commodityRate: commRate,
                          isCommodity: itemIsCommodity,
                          uomUnit: itemUom,
                          isDark: isDark,
                          onTap: () => _onProductSelected(p, cat, commRate, itemIsCommodity),
                        );
                      }),
                    ],
                  ],
                ] else ...[
                  // SELECTED PRODUCT DETAILS CARD
                  Container(
                    padding: const EdgeInsets.all(16),
                    decoration: BoxDecoration(
                      color: isDark ? const Color(0xFF1E293B) : Colors.blue.withValues(alpha: 0.05),
                      borderRadius: BorderRadius.circular(16),
                      border: Border.all(color: Colors.blue.withValues(alpha: 0.3)),
                    ),
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Row(
                          mainAxisAlignment: MainAxisAlignment.spaceBetween,
                          children: [
                            Expanded(
                              child: Text(
                                _selectedProduct!.name,
                                style: const TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
                              ),
                            ),
                            TextButton(
                              onPressed: () => setState(() {
                                _selectedProduct = null;
                                _selectedInventoryItem = null;
                              }),
                              child: const Text('Change'),
                            ),
                          ],
                        ),
                        const SizedBox(height: 6),
                        Wrap(
                          spacing: 8,
                          runSpacing: 4,
                          children: [
                            if (category?.name != null)
                              _buildSheetBadge(category!.name, const Color(0xFFD4AF37)),
                            if (_selectedProduct!.sku != null)
                              _buildSheetBadge('SKU: ${_selectedProduct!.sku}', Colors.blue),
                            if (isCommodity && _selectedInventoryItem?.huid != null)
                              _buildSheetBadge('HUID: ${_selectedInventoryItem!.huid}', Colors.purple),
                            if (isCommodity && category?.commodityCode != null)
                              _buildSheetBadge('${category!.commodityCode} (${formatPurity(purityFactor)})', Colors.teal),
                            if (isCommodity)
                              _buildSheetBadge('Purity: ${formatPurity(purityFactor)}', Colors.amber.shade800),
                            if (!isCommodity) ...[
                              _buildSheetBadge('Unit: $uomUnit', Colors.teal),
                              if (_selectedProductAvailableStock > 0)
                                _buildSheetBadge('Available Stock: ${_selectedProductAvailableStock.toStringAsFixed(_selectedProductAvailableStock.truncateToDouble() == _selectedProductAvailableStock ? 0 : 2)} $uomUnit', Colors.green.shade800),
                            ],
                          ],
                        ),
                      ],
                    ),
                  ),

                  const SizedBox(height: 16),

                  if (isCommodity) ...[
                    // COMMODITY / JEWELLERY FORM
                    Row(
                      children: [
                        Expanded(
                          child: TextFormField(
                            initialValue: category?.defaultHsn ?? _selectedProduct?.hsnCode ?? '7113',
                            style: const TextStyle(fontSize: 13, fontWeight: FontWeight.w600),
                            enabled: false,
                            decoration: InputDecoration(
                              labelText: 'HSN Code',
                              prefixIcon: const Icon(LucideIcons.hash, size: 18),
                              contentPadding: const EdgeInsets.symmetric(horizontal: 10, vertical: 12),
                              border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
                            ),
                          ),
                        ),
                        const SizedBox(width: 12),
                        Expanded(
                          child: PremiumTextField(
                            controller: _weightCtrl,
                            labelText: 'Weight ($uomUnit)',
                            keyboardType: const TextInputType.numberWithOptions(decimal: true),
                            prefixIcon: const Icon(LucideIcons.scale, size: 18),
                            onChanged: (_) => setState(() {}),
                          ),
                        ),
                      ],
                    ),
                    const SizedBox(height: 12),

                    Row(
                      children: [
                        Expanded(
                          child: TextFormField(
                            key: ValueKey(effectiveUnitRate),
                            initialValue: '₹${effectiveUnitRate.toStringAsFixed(2)}/$uomUnit',
                            style: const TextStyle(fontSize: 13, fontWeight: FontWeight.w600),
                            enabled: false,
                            decoration: InputDecoration(
                              labelText: 'Live Rate',
                              prefixIcon: const Icon(LucideIcons.trendingUp, size: 18),
                              contentPadding: const EdgeInsets.symmetric(horizontal: 10, vertical: 12),
                              border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
                            ),
                          ),
                        ),
                        const SizedBox(width: 12),
                        Expanded(
                          child: TextFormField(
                            key: ValueKey(metalAmount),
                            initialValue: '₹${metalAmount.toStringAsFixed(2)}',
                            style: const TextStyle(fontSize: 13, fontWeight: FontWeight.w600),
                            enabled: false,
                            decoration: InputDecoration(
                              labelText: 'Metal Amount',
                              prefixIcon: const Icon(LucideIcons.coins, size: 18),
                              contentPadding: const EdgeInsets.symmetric(horizontal: 10, vertical: 12),
                              border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
                            ),
                          ),
                        ),
                      ],
                    ),

                    const SizedBox(height: 16),

                    Row(
                      children: [
                        Expanded(
                          child: PremiumTextField(
                            controller: _makingChargeCtrl,
                            labelText: 'Making Charges',
                            keyboardType: const TextInputType.numberWithOptions(decimal: true),
                            prefixIcon: const Icon(LucideIcons.hammer),
                            onChanged: (_) => setState(() {}),
                          ),
                        ),
                        const SizedBox(width: 12),
                        Expanded(
                          child: DropdownButtonFormField<String>(
                            value: _makingChargeType,
                            decoration: InputDecoration(
                              labelText: 'Type',
                              border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
                            ),
                            items: const [
                              DropdownMenuItem(value: 'PER_GRAM', child: Text('Per Gram')),
                              DropdownMenuItem(value: 'PER_PIECE', child: Text('Per Piece')),
                              DropdownMenuItem(value: 'PERCENTAGE', child: Text('Percentage %')),
                            ],
                            onChanged: (val) => setState(() => _makingChargeType = val!),
                          ),
                        ),
                      ],
                    ),
                    if (makingAmt > 0) ...[
                      const SizedBox(height: 8),
                      Container(
                        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
                        decoration: BoxDecoration(
                          color: Colors.indigo.withValues(alpha: 0.08),
                          borderRadius: BorderRadius.circular(10),
                          border: Border.all(color: Colors.indigo.withValues(alpha: 0.2)),
                        ),
                        child: Row(
                          mainAxisAlignment: MainAxisAlignment.spaceBetween,
                          children: [
                            const Text(
                              'Calculated Making Charge:',
                              style: TextStyle(fontSize: 13, fontWeight: FontWeight.w500),
                            ),
                            Text(
                              '₹${makingAmt.toStringAsFixed(2)}',
                              style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 14, color: Colors.indigo),
                            ),
                          ],
                        ),
                      ),
                    ],
                    const SizedBox(height: 12),
                    PremiumTextField(
                      controller: _discountCtrl,
                      labelText: 'Item Discount (₹)',
                      keyboardType: const TextInputType.numberWithOptions(decimal: true),
                      prefixIcon: const Icon(LucideIcons.tag),
                      onChanged: (_) => setState(() {}),
                    ),
                  ] else ...[
                    // E-COMMERCE / GENERAL / NON-COMMODITY FORM
                    Row(
                      children: [
                        Expanded(
                          child: PremiumTextField(
                            controller: _unitPriceCtrl,
                            labelText: 'Unit Price (₹ / $uomUnit)',
                            keyboardType: const TextInputType.numberWithOptions(decimal: true),
                            prefixIcon: const Icon(LucideIcons.indianRupee),
                            onChanged: (_) => setState(() {}),
                          ),
                        ),
                        const SizedBox(width: 12),
                        Expanded(
                          child: Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              PremiumTextField(
                                controller: _quantityCtrl,
                                labelText: 'Quantity ($uomUnit)',
                                keyboardType: const TextInputType.numberWithOptions(decimal: true),
                                prefixIcon: const Icon(LucideIcons.package),
                                onChanged: (_) => setState(() {}),
                              ),
                              if (_selectedProductAvailableStock > 0 &&
                                  (double.tryParse(_quantityCtrl.text) ?? 0.0) > _selectedProductAvailableStock) ...[
                                const SizedBox(height: 4),
                                Text(
                                  'Exceeds available stock (${_selectedProductAvailableStock.toStringAsFixed(_selectedProductAvailableStock.truncateToDouble() == _selectedProductAvailableStock ? 0 : 2)} $uomUnit)',
                                  style: const TextStyle(fontSize: 11, color: Colors.orange, fontWeight: FontWeight.w600),
                                ),
                              ],
                            ],
                          ),
                        ),
                      ],
                    ),
                    const SizedBox(height: 12),
                    Row(
                      children: [
                        Expanded(
                          child: PremiumTextField(
                            controller: _discountCtrl,
                            labelText: 'Item Discount (₹)',
                            keyboardType: const TextInputType.numberWithOptions(decimal: true),
                            prefixIcon: const Icon(LucideIcons.tag),
                            onChanged: (_) => setState(() {}),
                          ),
                        ),
                        const SizedBox(width: 12),
                        Expanded(
                          child: TextFormField(
                            initialValue: category?.defaultHsn ?? _selectedProduct?.hsnCode ?? '-',
                            style: const TextStyle(fontSize: 13, fontWeight: FontWeight.w600),
                            enabled: false,
                            decoration: InputDecoration(
                              labelText: 'HSN Code',
                              prefixIcon: const Icon(LucideIcons.hash, size: 18),
                              contentPadding: const EdgeInsets.symmetric(horizontal: 10, vertical: 12),
                              border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
                            ),
                          ),
                        ),
                      ],
                    ),
                  ],

                  const SizedBox(height: 16),

                  // Calculated Subtotal & GST Display
                  Container(
                    padding: const EdgeInsets.all(16),
                    decoration: BoxDecoration(
                      color: isDark ? Colors.black26 : Colors.grey.shade100,
                      borderRadius: BorderRadius.circular(14),
                    ),
                    child: Column(
                      children: [
                        Row(
                          mainAxisAlignment: MainAxisAlignment.spaceBetween,
                          children: [
                            const Text('Taxable Subtotal:'),
                            Text('₹${taxable.toStringAsFixed(2)}', style: const TextStyle(fontWeight: FontWeight.bold)),
                          ],
                        ),
                        const SizedBox(height: 6),
                        Row(
                          mainAxisAlignment: MainAxisAlignment.spaceBetween,
                          children: [
                            Text('GST (${gstRate.toStringAsFixed(1)}%):'),
                            Text('+ ₹${taxAmount.toStringAsFixed(2)}', style: const TextStyle(fontWeight: FontWeight.bold, color: Colors.indigo)),
                          ],
                        ),
                        const Divider(height: 16),
                        Row(
                          mainAxisAlignment: MainAxisAlignment.spaceBetween,
                          children: [
                            const Text('Item Total:', style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold)),
                            Text('₹${total.toStringAsFixed(2)}', style: const TextStyle(fontSize: 18, fontWeight: FontWeight.bold, color: Colors.green)),
                          ],
                        ),
                      ],
                    ),
                  ),

                  const SizedBox(height: 24),

                  ElevatedButton(
                    onPressed: () => _submitItem(category, effectiveUnitRate, isCommodity, uomUnit),
                    style: ElevatedButton.styleFrom(
                      padding: const EdgeInsets.symmetric(vertical: 16),
                      backgroundColor: Colors.blue,
                      foregroundColor: Colors.white,
                      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
                    ),
                    child: const Text('Add to Invoice', style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold)),
                  ),
                ],
              ],
            ),
          ),
        ],
      ),
    ),
  ),
);
}

  Widget _buildSheetBadge(String text, Color color) {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
      decoration: BoxDecoration(
        color: color.withValues(alpha: 0.12),
        borderRadius: BorderRadius.circular(6),
        border: Border.all(color: color.withValues(alpha: 0.4)),
      ),
      child: Text(
        text,
        style: TextStyle(fontSize: 11, fontWeight: FontWeight.bold, color: color),
      ),
    );
  }

  Widget _buildProductSearchCard({
    required Product product,
    ProductCategory? category,
    required double availableStock,
    required double avgPrice,
    required String uomUnit,
    required bool isDark,
    required VoidCallback onTap,
  }) {
    final gstRate = product.gstRate ?? (category?.defaultGst ?? 18.0);
    final unitWithGst = avgPrice > 0 ? avgPrice * (1 + gstRate / 100.0) : 0.0;
    final totalStockValue = availableStock * avgPrice;
    final sku = product.sku;

    return Container(
      margin: const EdgeInsets.only(bottom: 12),
      decoration: BoxDecoration(
        color: isDark ? const Color(0xFF1E293B) : Colors.white,
        borderRadius: BorderRadius.circular(16),
        border: Border.all(color: isDark ? Colors.white12 : Colors.grey.shade200),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withValues(alpha: isDark ? 0.2 : 0.04),
            blurRadius: 8,
            offset: const Offset(0, 3),
          ),
        ],
      ),
      child: Material(
        color: Colors.transparent,
        borderRadius: BorderRadius.circular(16),
        child: InkWell(
          onTap: onTap,
          borderRadius: BorderRadius.circular(16),
          child: Padding(
            padding: const EdgeInsets.all(14),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Row(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Container(
                      padding: const EdgeInsets.all(8),
                      decoration: BoxDecoration(
                        color: Colors.blue.withValues(alpha: 0.12),
                        borderRadius: BorderRadius.circular(10),
                      ),
                      child: const Icon(
                        LucideIcons.package,
                        size: 20,
                        color: Colors.blue,
                      ),
                    ),
                    const SizedBox(width: 10),
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            product.name,
                            style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 15),
                          ),
                          const SizedBox(height: 4),
                          Wrap(
                            spacing: 6,
                            runSpacing: 4,
                            children: [
                              if (category?.name != null)
                                _buildSheetBadge(category!.name, const Color(0xFFD4AF37)),
                              if (sku != null && sku.isNotEmpty)
                                _buildSheetBadge('SKU: $sku', Colors.blue),
                              _buildSheetBadge('Unit: $uomUnit', Colors.teal),
                            ],
                          ),
                        ],
                      ),
                    ),
                  ],
                ),
                const Divider(height: 18),
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(
                          avgPrice > 0
                              ? 'Avg Price: ₹${avgPrice.toStringAsFixed(2)} / $uomUnit'
                              : 'Price: Not Set',
                          style: TextStyle(
                            fontSize: 13,
                            color: avgPrice > 0 ? (isDark ? Colors.white70 : Colors.grey.shade800) : Colors.orange.shade700,
                            fontWeight: FontWeight.w600,
                          ),
                        ),
                        const SizedBox(height: 3),
                        Text(
                          'Available Stock: ${availableStock.toStringAsFixed(availableStock.truncateToDouble() == availableStock ? 0 : 2)} $uomUnit',
                          style: TextStyle(
                            fontSize: 12,
                            fontWeight: FontWeight.bold,
                            color: availableStock > 0 ? Colors.green.shade700 : Colors.red.shade600,
                          ),
                        ),
                      ],
                    ),
                    Column(
                      crossAxisAlignment: CrossAxisAlignment.end,
                      children: [
                        if (avgPrice > 0 && availableStock > 0) ...[
                          Text(
                            '₹${totalStockValue.toStringAsFixed(2)}',
                            style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 16, color: Colors.green),
                          ),
                          Text(
                            '₹${unitWithGst.toStringAsFixed(2)}/$uomUnit (incl. ${gstRate.toStringAsFixed(1)}% GST)',
                            style: TextStyle(fontSize: 10, color: Colors.grey.shade500),
                          ),
                        ] else if (avgPrice > 0) ...[
                          Text(
                            '₹${unitWithGst.toStringAsFixed(2)} / $uomUnit',
                            style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 15, color: Colors.green),
                          ),
                          Text(
                            'incl. ${gstRate.toStringAsFixed(1)}% GST',
                            style: TextStyle(fontSize: 10, color: Colors.grey.shade500),
                          ),
                        ] else ...[
                          Container(
                            padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                            decoration: BoxDecoration(
                              color: Colors.blue.withValues(alpha: 0.12),
                              borderRadius: BorderRadius.circular(6),
                              border: Border.all(color: Colors.blue.withValues(alpha: 0.3)),
                            ),
                            child: const Text(
                              'Tap to enter price',
                              style: TextStyle(fontSize: 11, fontWeight: FontWeight.bold, color: Colors.blue),
                            ),
                          ),
                        ],
                      ],
                    ),
                  ],
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildSearchItemCard({
    required Product product,
    ProductCategory? category,
    InventoryItem? inventoryItem,
    required double commodityRate,
    required bool isCommodity,
    required String uomUnit,
    required bool isDark,
    required VoidCallback onTap,
  }) {
    final purity = resolvePurity(categoryPurity: category?.purityFactor, productPurity: product.purityFactor);
    final unitRate = isCommodity
        ? (commodityRate > 0 ? (commodityRate * purity) : (inventoryItem?.saleRate ?? product.sellingPrice ?? 0.0))
        : (inventoryItem?.saleRate ?? product.sellingPrice ?? 0.0);
    final weight = inventoryItem?.grossWeight ?? 1.0;
    final baseAmount = weight * unitRate;

    final makingCharge = (inventoryItem?.makingCharges != null && inventoryItem!.makingCharges! > 0)
        ? inventoryItem.makingCharges!
        : ((product.makingCharges != null && product.makingCharges! > 0)
            ? product.makingCharges!
            : (category?.defaultMakingCharge ?? 0.0));
    final makingType = (inventoryItem?.makingChargeType != null && inventoryItem!.makingChargeType!.isNotEmpty)
        ? inventoryItem.makingChargeType!
        : ((product.makingCharges != null && product.makingCharges! > 0 && product.makingChargesType != null)
            ? product.makingChargesType!
            : (category?.makingChargeType ?? 'PER_GRAM'));
    
    double makingAmt = 0.0;
    if (isCommodity) {
      if (makingType == 'PERCENTAGE') {
        makingAmt = baseAmount * (makingCharge / 100.0);
      } else if (makingType == 'PER_PIECE') {
        makingAmt = makingCharge;
      } else {
        makingAmt = weight * makingCharge;
      }
    }

    final gstRate = product.gstRate ?? (category?.defaultGst ?? (isCommodity ? 3.0 : 18.0));
    final taxable = baseAmount + makingAmt;
    final taxAmount = (taxable * gstRate) / 100.0;
    final totalWithTax = taxable + taxAmount;

    final huid = inventoryItem?.huid;
    final sku = inventoryItem?.sku ?? product.sku;

    return Container(
      margin: const EdgeInsets.only(bottom: 12),
      decoration: BoxDecoration(
        color: isDark ? const Color(0xFF1E293B) : Colors.white,
        borderRadius: BorderRadius.circular(16),
        border: Border.all(color: isDark ? Colors.white12 : Colors.grey.shade200),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withValues(alpha: isDark ? 0.2 : 0.04),
            blurRadius: 8,
            offset: const Offset(0, 3),
          ),
        ],
      ),
      child: Material(
        color: Colors.transparent,
        borderRadius: BorderRadius.circular(16),
        child: InkWell(
          onTap: onTap,
          borderRadius: BorderRadius.circular(16),
          child: Padding(
            padding: const EdgeInsets.all(14),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Row(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Container(
                      padding: const EdgeInsets.all(8),
                      decoration: BoxDecoration(
                        color: (isCommodity ? (huid != null ? Colors.purple : const Color(0xFFD4AF37)) : Colors.blue).withValues(alpha: 0.12),
                        borderRadius: BorderRadius.circular(10),
                      ),
                      child: Icon(
                        isCommodity ? (huid != null ? LucideIcons.gem : LucideIcons.sparkles) : LucideIcons.tag,
                        size: 20,
                        color: isCommodity ? (huid != null ? Colors.purple : const Color(0xFFD4AF37)) : Colors.blue,
                      ),
                    ),
                    const SizedBox(width: 10),
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            product.name,
                            style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 15),
                          ),
                          const SizedBox(height: 4),
                          Wrap(
                            spacing: 6,
                            runSpacing: 4,
                            children: [
                              if (category?.name != null)
                                _buildSheetBadge(category!.name, const Color(0xFFD4AF37)),
                              if (sku != null && sku.isNotEmpty)
                                _buildSheetBadge('SKU: $sku', Colors.blue),
                              if (isCommodity && huid != null && huid.isNotEmpty)
                                _buildSheetBadge('HUID: $huid', Colors.purple),
                              if (isCommodity)
                                _buildSheetBadge('Purity: ${formatPurity(purity)}', Colors.amber.shade900),
                              if (!isCommodity)
                                _buildSheetBadge('Unit: $uomUnit', Colors.teal),
                            ],
                          ),
                        ],
                      ),
                    ),
                  ],
                ),
                const Divider(height: 18),
                if (isCommodity) ...[
                  Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: [
                      Text(
                        'Rate: ₹${unitRate.toStringAsFixed(2)}/$uomUnit • ${weight.toStringAsFixed(3)}$uomUnit',
                        style: TextStyle(fontSize: 13, color: Colors.grey.shade600, fontWeight: FontWeight.w500),
                      ),
                      Text(
                        'Metal: ₹${baseAmount.toStringAsFixed(2)}',
                        style: const TextStyle(fontSize: 13, fontWeight: FontWeight.w600),
                      ),
                    ],
                  ),
                  const SizedBox(height: 6),
                  Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: [
                      Container(
                        padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
                        decoration: BoxDecoration(
                          color: Colors.indigo.withValues(alpha: 0.1),
                          borderRadius: BorderRadius.circular(6),
                          border: Border.all(color: Colors.indigo.withValues(alpha: 0.2)),
                        ),
                        child: Text(
                          'Making: ${makingType == 'PERCENTAGE' ? '$makingCharge%' : (makingType == 'PER_PIECE' ? '₹$makingCharge/pc' : '₹$makingCharge/g')} (₹${makingAmt.toStringAsFixed(2)})',
                          style: const TextStyle(fontSize: 11, fontWeight: FontWeight.bold, color: Colors.indigo),
                        ),
                      ),
                      Column(
                        crossAxisAlignment: CrossAxisAlignment.end,
                        children: [
                          Text(
                            '₹${totalWithTax.toStringAsFixed(2)}',
                            style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 16, color: Colors.green),
                          ),
                          Text(
                            'incl. ${gstRate.toStringAsFixed(1)}% GST',
                            style: TextStyle(fontSize: 10, color: Colors.grey.shade500),
                          ),
                        ],
                      ),
                    ],
                  ),
                ] else ...[
                  Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: [
                      Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            unitRate > 0
                                ? 'Price: ₹${unitRate.toStringAsFixed(2)} / $uomUnit'
                                : 'Price: Not Set',
                            style: TextStyle(
                              fontSize: 13,
                              color: unitRate > 0 ? (isDark ? Colors.white70 : Colors.grey.shade800) : Colors.orange.shade700,
                              fontWeight: FontWeight.w600,
                            ),
                          ),
                          if (inventoryItem?.grossWeight != null && inventoryItem!.grossWeight! > 0) ...[
                            const SizedBox(height: 2),
                            Text(
                              'In Stock: ${(inventoryItem!.grossWeight!).toStringAsFixed((inventoryItem!.grossWeight!).truncateToDouble() == inventoryItem!.grossWeight! ? 0 : 2)} $uomUnit',
                              style: TextStyle(fontSize: 11, color: isDark ? Colors.white54 : Colors.grey.shade600),
                            ),
                          ],
                        ],
                      ),
                      Column(
                        crossAxisAlignment: CrossAxisAlignment.end,
                        children: [
                          if (unitRate > 0) ...[
                            Text(
                              '₹${totalWithTax.toStringAsFixed(2)}',
                              style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 16, color: Colors.green),
                            ),
                            Text(
                              'incl. ${gstRate.toStringAsFixed(1)}% GST',
                              style: TextStyle(fontSize: 10, color: Colors.grey.shade500),
                            ),
                          ] else ...[
                            Container(
                              padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                              decoration: BoxDecoration(
                                color: Colors.blue.withValues(alpha: 0.12),
                                borderRadius: BorderRadius.circular(6),
                                border: Border.all(color: Colors.blue.withValues(alpha: 0.3)),
                              ),
                              child: const Text(
                                'Tap to enter price',
                                style: TextStyle(fontSize: 11, fontWeight: FontWeight.bold, color: Colors.blue),
                              ),
                            ),
                          ],
                        ],
                      ),
                    ],
                  ),
                ],
              ],
            ),
          ),
        ),
      ),
    );
  }
}