import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:lucide_icons/lucide_icons.dart';
import 'package:intl/intl.dart';
import '../../business/providers/business_provider.dart';
import '../../../core/widgets/barcode_scanner_screen.dart';
import '../../../core/widgets/smart_search_dropdown.dart';
import '../../../core/widgets/premium_text_field.dart';
import '../providers/invoices_provider.dart';
import '../domain/invoice.dart';
import '../providers/customers_provider.dart';
import '../domain/customer.dart';
import '../../inventory/providers/products_provider.dart';
import '../../inventory/domain/product.dart';
import 'add_customer_sheet.dart';
import '../../transactions/providers/providers.dart';

class InvoiceBuilderScreen extends ConsumerStatefulWidget {
  const InvoiceBuilderScreen({super.key});

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

class _InvoiceBuilderScreenState extends ConsumerState<InvoiceBuilderScreen> {
  final _formKey = GlobalKey<FormState>();
  Customer? _selectedCustomer;
  final List<InvoiceItem> _items = [];
  bool _isEmi = false;
  String _emiCycle = 'MONTHLY';
  final TextEditingController _emiAmountCtrl = TextEditingController();
  final TextEditingController _invoiceNumberCtrl = TextEditingController(text: 'INV-${DateTime.now().millisecondsSinceEpoch.toString().substring(7)}');
  final TextEditingController _invoiceDiscountCtrl = TextEditingController();
  bool _invoiceDiscountIsPerc = false;
  DateTime _invoiceDate = DateTime.now();
  final TextEditingController _amountPaidCtrl = TextEditingController();
  bool _isAmountPaidEdited = false;
  DateTime? _nextPaymentDate;
  String _paymentMethod = 'Cash';
  int? _selectedWalletId;
  
  double get _subtotal => _items.fold(0, (sum, item) => sum + (item.quantity * item.unitPrice));
  double get _taxTotal => _items.fold(0, (sum, item) => sum + (item.quantity * item.unitPrice * (item.taxRate / 100)));
  double get _itemDiscountTotal => _items.fold(0, (sum, item) => sum + item.discount);
  
  double get _invoiceDiscountAmount {
    final raw = double.tryParse(_invoiceDiscountCtrl.text) ?? 0;
    if (_invoiceDiscountIsPerc) {
      final taxableAmount = _subtotal + _makingChargeTotal + _otherChargesTotal;
      return taxableAmount * (raw / 100);
    }
    return raw;
  }

  double get _discountTotal => _itemDiscountTotal + _invoiceDiscountAmount;
  double get _makingChargeTotal => _items.fold(0, (sum, item) => sum + item.makingCharge);
  double get _otherChargesTotal => _items.fold(0, (sum, item) => sum + item.otherCharges);
  double get _grandTotal => _subtotal + _taxTotal + _makingChargeTotal + _otherChargesTotal - _discountTotal;
  
  double get _amountPaid {
    if (!_isAmountPaidEdited) return _grandTotal;
    final raw = double.tryParse(_amountPaidCtrl.text) ?? 0;
    return raw > _grandTotal ? _grandTotal : raw; // Cap at grand total
  }
  double get _balanceDue => _grandTotal - _amountPaid;

  Future<void> _saveInvoice() async {
    if (!_formKey.currentState!.validate() || _items.isEmpty) {
      ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('Please add items and fill all required fields.')));
      return;
    }

    final invoice = Invoice(
      customerId: _selectedCustomer?.id,
      invoiceNumber: _invoiceNumberCtrl.text,
      issueDate: _invoiceDate,
      dueDate: DateTime.now().add(const Duration(days: 30)),
      subtotal: _subtotal,
      taxTotal: _taxTotal,
      discountTotal: _discountTotal,
      totalAmount: _grandTotal,
      amountPaid: _amountPaid,
      paymentMethod: _amountPaid > 0 ? _paymentMethod : null,
      paymentWalletId: _amountPaid > 0 ? (_selectedWalletId ?? (ref.read(walletProvider).value?.firstOrNull?.id)) : null,
      nextPaymentDate: _balanceDue > 0 ? (_nextPaymentDate ?? DateTime.now().add(const Duration(days: 30))) : null,
      isEmi: _isEmi,
      emiAmount: _isEmi && _emiAmountCtrl.text.isNotEmpty ? double.parse(_emiAmountCtrl.text) : null,
      emiCycle: _isEmi ? _emiCycle : null,
      emiStartDate: _isEmi ? DateTime.now().add(const Duration(days: 30)) : null,
      items: _items,
    );

    try {
      await ref.read(invoicesProvider.notifier).createInvoice(invoice);
      if (mounted) {
        Navigator.pop(context);
        ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('Invoice Created!')));
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Error: $e')));
      }
    }
  }

  void _showAddItemDialog() {
    Product? selectedProduct;
    final TextEditingController descCtrl = TextEditingController();
    final TextEditingController qtyCtrl = TextEditingController(text: '1');
    final TextEditingController priceCtrl = TextEditingController();
    final TextEditingController taxCtrl = TextEditingController(text: '0');
    final TextEditingController discountCtrl = TextEditingController(text: '0');
    final TextEditingController makingCtrl = TextEditingController(text: '0');
    final TextEditingController otherCtrl = TextEditingController(text: '0');
    String uomStr = '';

    showDialog(
      context: context,
      builder: (context) {
        bool isDiscPerc = false;
        return StatefulBuilder(
          builder: (context, setDialogState) {
            return AlertDialog(
              title: const Text('Add Line Item'),
              content: SingleChildScrollView(
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    Consumer(
                      builder: (context, dialogRef, _) {
                        final productsState = dialogRef.watch(productsProvider);
                        return productsState.when(
                          data: (products) => Row(
                            children: [
                              Expanded(
                                child: SmartSearchDropdown<Product>(
                                  hintText: 'Select Product (Optional)',
                                  value: selectedProduct,
                                  items: products,
                                  itemAsString: (p) => '${p.name} ${p.sku != null && p.sku!.isNotEmpty ? "(${p.sku})" : ""} (₹${p.sellingPrice})',
                                  onChanged: (p) {
                                    setDialogState(() {
                                      selectedProduct = p;
                                      if (p != null) {
                                        descCtrl.text = p.name;
                                        priceCtrl.text = p.sellingPrice?.toString() ?? '0';
                                        taxCtrl.text = p.gstRate?.toString() ?? '0';
                                        makingCtrl.text = p.makingCharges?.toString() ?? '0';
                                        uomStr = ''; 
                                      }
                                    });
                                  }
                                ),
                              ),
                              const SizedBox(width: 8),
                              IconButton(
                                onPressed: () async {
                                  final String? code = await Navigator.push(
                                    context,
                                    MaterialPageRoute(builder: (_) => const BarcodeScannerScreen()),
                                  );
                                  if (code != null && code.isNotEmpty) {
                                    final source = ref.read(businessFeatureProvider).value?.barcodeSource ?? 'SKU';
                                    Product? matched;
                                    if (source == 'BARCODE') {
                                      matched = products.cast<Product?>().firstWhere((p) => p?.barcode == code, orElse: () => null);
                                    } else {
                                      matched = products.cast<Product?>().firstWhere((p) => p?.sku == code, orElse: () => null);
                                    }
                                    
                                    if (matched != null) {
                                      setDialogState(() {
                                        selectedProduct = matched;
                                        descCtrl.text = matched!.name;
                                        priceCtrl.text = matched!.sellingPrice?.toString() ?? '0';
                                        taxCtrl.text = matched!.gstRate?.toString() ?? '0';
                                        makingCtrl.text = matched!.makingCharges?.toString() ?? '0';
                                      });
                                    } else {
                                      if (context.mounted) {
                                        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('No product found for $source: $code')));
                                      }
                                    }
                                  }
                                },
                                icon: const Icon(LucideIcons.scanLine),
                                color: Theme.of(context).colorScheme.primary,
                                tooltip: 'Scan Barcode',
                              )
                            ],
                          ),
                          loading: () => const Center(child: CircularProgressIndicator()),
                          error: (e, stack) => Text('Error loading products: $e'),
                        );
                      }
                    ),
                    const SizedBox(height: 12),
                    PremiumTextField(controller: descCtrl, labelText: 'Description'),
                    const SizedBox(height: 12),
                    Row(
                      children: [
                        Expanded(child: PremiumTextField(controller: qtyCtrl, labelText: uomStr.isNotEmpty ? 'Qty ($uomStr)' : 'Quantity', keyboardType: TextInputType.number)),
                        const SizedBox(width: 8),
                        Expanded(child: PremiumTextField(controller: priceCtrl, labelText: 'Unit Price', keyboardType: TextInputType.number)),
                      ],
                    ),
                    const SizedBox(height: 12),
                    Row(
                      children: [
                        Expanded(child: PremiumTextField(controller: taxCtrl, labelText: 'Tax %', keyboardType: TextInputType.number)),
                        const SizedBox(width: 8),
                        Expanded(
                          child: PremiumTextField(
                            controller: discountCtrl,
                            labelText: isDiscPerc ? 'Discount %' : 'Discount (₹)',
                            keyboardType: TextInputType.number,
                            suffixIcon: IconButton(
                              icon: Icon(isDiscPerc ? LucideIcons.percent : LucideIcons.indianRupee, size: 16),
                              onPressed: () => setDialogState(() => isDiscPerc = !isDiscPerc),
                            ),
                          )
                        ),
                      ],
                    ),
                  const SizedBox(height: 12),
                  Row(
                    children: [
                      Expanded(child: PremiumTextField(controller: makingCtrl, labelText: 'Making Chg', keyboardType: TextInputType.number)),
                      const SizedBox(width: 8),
                      Expanded(child: PremiumTextField(controller: otherCtrl, labelText: 'Other Chg', keyboardType: TextInputType.number)),
                    ],
                  ),
                ],
              ),
            ),
            actions: [
              TextButton(onPressed: () => Navigator.pop(context), child: const Text('Cancel')),
              TextButton(
                onPressed: () {
                  final qty = double.tryParse(qtyCtrl.text) ?? 1;
                  final price = double.tryParse(priceCtrl.text) ?? 0;
                  final tax = double.tryParse(taxCtrl.text) ?? 0;
                  final discRaw = double.tryParse(discountCtrl.text) ?? 0;
                  final disc = isDiscPerc ? ((qty * price) * (discRaw / 100)) : discRaw;
                  final making = double.tryParse(makingCtrl.text) ?? 0;
                  final other = double.tryParse(otherCtrl.text) ?? 0;
                  final total = (qty * price) + (qty * price * (tax / 100)) + making + other - disc;

                  setState(() {
                    _items.add(InvoiceItem(
                      productId: selectedProduct?.id,
                      sku: selectedProduct?.sku,
                      description: descCtrl.text,
                      quantity: qty,
                      unitPrice: price,
                      taxRate: tax,
                      discount: disc,
                      makingCharge: making,
                      otherCharges: other,
                      total: total,
                    ));
                  });
                  Navigator.pop(context);
                },
                child: const Text('Add Item'),
              ),
            ],
          );
        },
      );
      },
    );
  }

  void _scanAndAddBarcode() async {
    final barcode = await Navigator.push<String>(
      context,
      MaterialPageRoute(builder: (_) => const BarcodeScannerScreen()),
    );
    if (barcode != null && barcode.isNotEmpty) {
      final products = ref.read(productsProvider).value ?? [];
      final businessFeature = ref.read(businessFeatureProvider).value;
      final bool useBarcodeField = businessFeature?.barcodeSource == 'BARCODE';

      final p = products.where((p) {
        if (useBarcodeField) {
          return p.barcode?.toLowerCase() == barcode.toLowerCase();
        } else {
          return p.sku?.toLowerCase() == barcode.toLowerCase();
        }
      }).firstOrNull;

      if (p != null) {
        setState(() {
          final existingIndex = _items.indexWhere((item) => item.productId == p.id);
          if (existingIndex >= 0) {
            // Increment qty
            final item = _items[existingIndex];
            final newQty = item.quantity + 1;
            final newTotal = (newQty * item.unitPrice) + (newQty * item.unitPrice * (item.taxRate / 100)) + item.makingCharge + item.otherCharges - item.discount;
            _items[existingIndex] = item.copyWith(quantity: newQty, total: newTotal);
          } else {
            // Add new
            final price = p.sellingPrice ?? 0;
            final tax = p.gstRate ?? 0;
            final making = p.makingCharges ?? 0;
            final total = price + (price * (tax / 100)) + making;
            _items.add(InvoiceItem(
              productId: p.id,
              sku: p.sku,
              description: p.name,
              quantity: 1,
              unitPrice: price,
              taxRate: tax,
              makingCharge: making,
              otherCharges: 0,
              discount: 0,
              total: total,
            ));
          }
        });
        if (context.mounted) {
          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${p.name} to invoice')));
        }
      } else {
        if (context.mounted) {
          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Product not found for barcode: $barcode')));
        }
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    final customersState = ref.watch(customersProvider);
    final formatCurrency = NumberFormat.currency(symbol: '₹');

    return Scaffold(
      backgroundColor: Colors.grey[50],
      appBar: AppBar(
        title: const Text('Create Invoice'),
        elevation: 0,
        backgroundColor: Colors.white,
        foregroundColor: Colors.black,
        actions: [
          TextButton(
            onPressed: _saveInvoice,
            child: const Text('Save Invoice', style: TextStyle(fontWeight: FontWeight.bold, color: Colors.blue)),
          )
        ],
      ),
      body: GestureDetector(
        onTap: () => FocusScope.of(context).unfocus(),
        child: Form(
          key: _formKey,
          child: SingleChildScrollView(
            padding: const EdgeInsets.all(16),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              // Customer Selection
              Container(
                padding: const EdgeInsets.all(16),
                decoration: BoxDecoration(color: Colors.white, borderRadius: BorderRadius.circular(16)),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Row(
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      children: [
                        const Text('Customer', style: TextStyle(fontWeight: FontWeight.bold, fontSize: 16)),
                        TextButton.icon(
                          onPressed: () {
                            showModalBottomSheet(
                              context: context,
                              isScrollControlled: true,
                              builder: (_) => const AddCustomerSheet(),
                            );
                          },
                          icon: const Icon(LucideIcons.plus, size: 16),
                          label: const Text('Add Customer'),
                        ),
                      ],
                    ),
                    const SizedBox(height: 8),
                    customersState.when(
                      loading: () => const CircularProgressIndicator(),
                      error: (err, stack) => Text('Error loading customers: $err'),
                      data: (customers) => SmartSearchDropdown<Customer>(
                        hintText: 'Search a Customer...',
                        value: _selectedCustomer,
                        items: customers,
                        itemAsString: (c) => c.name,
                        onChanged: (val) => setState(() => _selectedCustomer = val),
                      ),
                    ),
                  ],
                ),
              ),
              const SizedBox(height: 16),
              
              // Invoice Details
              Container(
                padding: const EdgeInsets.all(16),
                decoration: BoxDecoration(color: Colors.white, borderRadius: BorderRadius.circular(16)),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    const Text('Invoice Details', style: TextStyle(fontWeight: FontWeight.bold, fontSize: 16)),
                    const SizedBox(height: 12),
                    PremiumTextField(
                      controller: _invoiceNumberCtrl,
                      labelText: 'Invoice Number',
                      validator: (val) => val == null || val.isEmpty ? 'Required' : null,
                    ),
                    const SizedBox(height: 12),
                    ListTile(
                      contentPadding: EdgeInsets.zero,
                      title: const Text('Invoice Date'),
                      subtitle: Text(DateFormat('yyyy-MM-dd').format(_invoiceDate)),
                      trailing: const Icon(LucideIcons.calendar),
                      onTap: () async {
                        final dt = await showDatePicker(
                          context: context,
                          initialDate: _invoiceDate,
                          firstDate: DateTime(2000),
                          lastDate: DateTime(2100),
                        );
                        if (dt != null) {
                          setState(() => _invoiceDate = dt);
                        }
                      },
                    ),
                    const SizedBox(height: 12),
                  ],
                ),
              ),
              const SizedBox(height: 16),

              // Items
              Container(
                padding: const EdgeInsets.all(16),
                decoration: BoxDecoration(color: Colors.white, borderRadius: BorderRadius.circular(16)),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                      Row(
                        mainAxisAlignment: MainAxisAlignment.spaceBetween,
                        children: [
                          const Text('Line Items', style: TextStyle(fontWeight: FontWeight.bold, fontSize: 16)),
                          Row(
                            children: [
                              Consumer(
                                builder: (context, ref, child) {
                                  final feature = ref.watch(businessFeatureProvider).value;
                                  final isBarcode = feature?.barcodeSource == 'BARCODE';
                                  return Row(
                                    children: [
                                      Text('Scan by:', style: TextStyle(fontSize: 12, color: Colors.grey.shade600)),
                                      const SizedBox(width: 4),
                                      Text('SKU', style: TextStyle(fontSize: 10, fontWeight: !isBarcode ? FontWeight.bold : FontWeight.normal, color: !isBarcode ? Colors.blue : Colors.grey)),
                                      Transform.scale(
                                        scale: 0.7,
                                        child: Switch(
                                          value: isBarcode,
                                          activeColor: Colors.blue,
                                          onChanged: (val) {
                                            if (feature != null) {
                                              ref.read(businessFeatureProvider.notifier).updateFeatures(
                                                feature.copyWith(barcodeSource: val ? 'BARCODE' : 'SKU')
                                              );
                                            }
                                          },
                                        ),
                                      ),
                                      Text('EAN', style: TextStyle(fontSize: 10, fontWeight: isBarcode ? FontWeight.bold : FontWeight.normal, color: isBarcode ? Colors.blue : Colors.grey)),
                                    ],
                                  );
                                },
                              ),
                              IconButton(
                                icon: const Icon(LucideIcons.scanLine, color: Colors.blue),
                                onPressed: _scanAndAddBarcode,
                                tooltip: 'Scan to add',
                              ),
                              TextButton.icon(
                                onPressed: _showAddItemDialog,
                                icon: const Icon(LucideIcons.plus),
                                label: const Text('Add'),
                              ),
                            ],
                          )
                        ],
                      ),
                    if (_items.isEmpty)
                      const Padding(
                        padding: EdgeInsets.symmetric(vertical: 16.0),
                        child: Center(child: Text('No items added', style: TextStyle(color: Colors.grey))),
                      ),
                    for (var i = 0; i < _items.length; i++)
                      Container(
                        margin: const EdgeInsets.only(bottom: 8),
                        padding: const EdgeInsets.all(8),
                        decoration: BoxDecoration(
                          color: Colors.grey[50],
                          border: Border.all(color: Colors.grey[200]!),
                          borderRadius: BorderRadius.circular(12)
                        ),
                        child: Row(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: [
                            Expanded(
                              child: Column(
                                crossAxisAlignment: CrossAxisAlignment.start,
                                children: [
                                  Text(_items[i].description ?? 'Item ${i+1}', style: const TextStyle(fontWeight: FontWeight.bold)),
                                  const SizedBox(height: 4),
                                  Wrap(
                                    spacing: 8,
                                    runSpacing: 4,
                                    children: [
                                      if (_items[i].sku != null && _items[i].sku!.isNotEmpty) Text('SKU: ${_items[i].sku}', style: const TextStyle(fontSize: 12, color: Colors.grey)),
                                      Text('Qty: ${_items[i].quantity}', style: const TextStyle(fontSize: 12, color: Colors.grey)),
                                      Text('Rate: ${formatCurrency.format(_items[i].unitPrice)}', style: const TextStyle(fontSize: 12, color: Colors.grey)),
                                      if (_items[i].taxRate > 0) Text('Tax: ${_items[i].taxRate}%', style: const TextStyle(fontSize: 12, color: Colors.grey)),
                                      if (_items[i].makingCharge > 0) Text('Making: ${formatCurrency.format(_items[i].makingCharge)}', style: const TextStyle(fontSize: 12, color: Colors.grey)),
                                      if (_items[i].otherCharges > 0) Text('Other: ${formatCurrency.format(_items[i].otherCharges)}', style: const TextStyle(fontSize: 12, color: Colors.grey)),
                                      if (_items[i].discount > 0) Text('Disc: -${formatCurrency.format(_items[i].discount)}', style: const TextStyle(fontSize: 12, color: Colors.red)),
                                    ],
                                  ),
                                ],
                              ),
                            ),
                            Column(
                              crossAxisAlignment: CrossAxisAlignment.end,
                              children: [
                                Text(formatCurrency.format(_items[i].total), style: const TextStyle(fontWeight: FontWeight.bold, color: Colors.blue)),
                                IconButton(
                                  padding: EdgeInsets.zero,
                                  constraints: const BoxConstraints(),
                                  icon: const Icon(LucideIcons.trash2, color: Colors.red, size: 18),
                                  onPressed: () => setState(() => _items.removeAt(i)),
                                ),
                              ],
                            )
                          ],
                        ),
                      ),
                    const Divider(),
                    Row(
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      children: [
                        const Text('Invoice Discount', style: TextStyle(fontWeight: FontWeight.w600)),
                        SizedBox(
                          width: 150,
                          child: TextField(
                            controller: _invoiceDiscountCtrl,
                            textAlign: TextAlign.right,
                            decoration: InputDecoration(
                              hintText: '0.00',
                              isDense: true,
                              contentPadding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
                              border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
                              prefixIcon: IconButton(
                                icon: Icon(_invoiceDiscountIsPerc ? LucideIcons.percent : LucideIcons.indianRupee, size: 16),
                                onPressed: () => setState(() => _invoiceDiscountIsPerc = !_invoiceDiscountIsPerc),
                                padding: EdgeInsets.zero,
                                constraints: const BoxConstraints(),
                              ),
                            ),
                            keyboardType: const TextInputType.numberWithOptions(decimal: true),
                            onChanged: (val) {
                              setState(() {
                                if (!_isAmountPaidEdited) {
                                  _amountPaidCtrl.text = _grandTotal.toStringAsFixed(2);
                                }
                              });
                            },
                          ),
                        ),
                      ],
                    ),
                    const SizedBox(height: 12),
                    Row(
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      children: [
                        const Text('Total Amount', style: TextStyle(fontWeight: FontWeight.bold, fontSize: 18)),
                        Text(formatCurrency.format(_grandTotal), style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 20, color: Colors.blue)),
                      ],
                    ),
                    const Divider(height: 32),
                    Row(
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      children: [
                        const Text('Amount Paid Now', style: TextStyle(fontWeight: FontWeight.w600)),
                        SizedBox(
                          width: 150,
                          child: TextField(
                            controller: _amountPaidCtrl,
                            textAlign: TextAlign.right,
                            decoration: InputDecoration(
                              hintText: _grandTotal.toStringAsFixed(2),
                              isDense: true,
                              contentPadding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
                              border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
                            ),
                            keyboardType: const TextInputType.numberWithOptions(decimal: true),
                            onChanged: (val) => setState(() {
                              _isAmountPaidEdited = true;
                            }),
                          ),
                        ),
                      ],
                    ),
                    if (_amountPaid > 0) ...[
                      const SizedBox(height: 12),
                      Row(
                        mainAxisAlignment: MainAxisAlignment.spaceBetween,
                        children: [
                          const Text('Receive Into Wallet', style: TextStyle(fontWeight: FontWeight.w600)),
                          SizedBox(
                            width: 150,
                            child: Consumer(
                              builder: (context, consumerRef, _) {
                                final walletsState = consumerRef.watch(walletProvider);
                                final allWallets = walletsState.value ?? [];
                                
                                final wallets = allWallets.where((w) {
                                  if (_paymentMethod == 'Cash') {
                                    return w.nature == 'CASH';
                                  } else {
                                    return w.nature == 'INCOME' || w.nature == 'SAVINGS';
                                  }
                                }).toList();

                                if (wallets.isNotEmpty && (_selectedWalletId == null || !wallets.any((w) => w.id == _selectedWalletId))) {
                                  WidgetsBinding.instance.addPostFrameCallback((_) {
                                    if (mounted) setState(() => _selectedWalletId = wallets.first.id);
                                  });
                                }

                                return DropdownButtonHideUnderline(
                                  child: DropdownButton<int>(
                                    value: _selectedWalletId,
                                    isDense: true,
                                    hint: const Text('Wallet'),
                                    items: wallets
                                        .map((w) => DropdownMenuItem(value: w.id, child: Text(w.name)))
                                        .toList(),
                                    onChanged: (val) => setState(() => _selectedWalletId = val),
                                  ),
                                );
                              },
                            ),
                          ),
                        ],
                      ),
                      const SizedBox(height: 12),
                      Row(
                        mainAxisAlignment: MainAxisAlignment.spaceBetween,
                        children: [
                          const Text('Payment Method', style: TextStyle(fontWeight: FontWeight.w600)),
                          SizedBox(
                            width: 150,
                            child: DropdownButtonHideUnderline(
                              child: DropdownButton<String>(
                                value: _paymentMethod,
                                isDense: true,
                                items: ['Cash', 'UPI', 'Bank Transfer', 'Card']
                                    .map((m) => DropdownMenuItem(value: m, child: Text(m)))
                                    .toList(),
                                onChanged: (val) {
                                  if (val != null) {
                                    setState(() {
                                      _paymentMethod = val;
                                      _selectedWalletId = null;
                                    });
                                  }
                                },
                              ),
                            ),
                          ),
                        ],
                      ),
                    ],
                    const SizedBox(height: 12),
                    Row(
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      children: [
                        const Text('Balance Due', style: TextStyle(fontWeight: FontWeight.bold, color: Colors.red)),
                        Text(formatCurrency.format(_balanceDue), style: const TextStyle(fontWeight: FontWeight.bold, color: Colors.red)),
                      ],
                    ),
                    if (_balanceDue > 0) ...[
                      const SizedBox(height: 12),
                      SwitchListTile(
                        title: const Text('Enable EMI / Installments'),
                        value: _isEmi,
                        onChanged: (val) => setState(() => _isEmi = val),
                        contentPadding: EdgeInsets.zero,
                      ),
                      if (_isEmi) ...[
                        Row(
                          children: [
                            Expanded(
                              child: PremiumTextField(
                                controller: _emiAmountCtrl,
                                labelText: 'EMI Amount',
                                keyboardType: TextInputType.number,
                              ),
                            ),
                            const SizedBox(width: 8),
                            Expanded(
                              child: SmartSearchDropdown<String>(
                                hintText: 'Cycle',
                                value: _emiCycle,
                                items: const ['MONTHLY', 'WEEKLY'],
                                itemAsString: (val) => val == 'MONTHLY' ? 'Monthly' : 'Weekly',
                                onChanged: (val) => setState(() => _emiCycle = val!),
                              ),
                            ),
                          ],
                        )
                      ] else ...[
                        const SizedBox(height: 12),
                        ListTile(
                          contentPadding: EdgeInsets.zero,
                          title: const Text('Next Payment Date', style: TextStyle(fontWeight: FontWeight.w600)),
                          subtitle: Text(_nextPaymentDate == null 
                              ? 'Not Selected' 
                              : DateFormat('yyyy-MM-dd').format(_nextPaymentDate!)),
                          trailing: const Icon(LucideIcons.calendar),
                          onTap: () async {
                            final dt = await showDatePicker(
                              context: context,
                              initialDate: _nextPaymentDate ?? DateTime.now().add(const Duration(days: 30)),
                              firstDate: DateTime.now(),
                              lastDate: DateTime(2100),
                            );
                            if (dt != null) {
                              setState(() => _nextPaymentDate = dt);
                            }
                          },
                        ),
                      ],
                    ],
                  ],
                ),
              ),
              const SizedBox(height: 32),
            ],
          ),
        ),
        ),
      ),
    );
  }
}