import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:lucide_icons_flutter/lucide_icons.dart';
import '../../features/inventory/providers/commodity_rates_provider.dart';
import '../../features/business/providers/business_provider.dart';
import '../../features/business/providers/business_mode_provider.dart';
import '../../features/transactions/presentation/add_transaction_screen.dart';
import '../../features/sales/presentation/invoice_builder_screen.dart';
import '../../features/vendor/presentation/purchase_order_builder_screen.dart';
import '../../features/inventory/presentation/add_product_screen.dart';
import '../../features/auth/presentation/profile_screen.dart';

class DesktopSidebar extends ConsumerWidget {
  final int selectedIndex;
  final ValueChanged<int> onDestinationSelected;

  const DesktopSidebar({
    super.key,
    required this.selectedIndex,
    required this.onDestinationSelected,
  });

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final theme = Theme.of(context);
    final isDark = theme.brightness == Brightness.dark;
    final isBusinessMode = ref.watch(businessModeProvider);
    final businessProfile = ref.watch(businessProfileProvider).asData?.value;
    final nature = (businessProfile?.natureOfBusiness ?? businessProfile?.industry ?? 'JEWELLERY').toUpperCase();
    final isJewellery = nature == 'JEWELLERY';
    final ratesAsync = ref.watch(commodityRatesProvider);

    return Container(
      width: 260,
      decoration: BoxDecoration(
        color: isDark ? const Color(0xFF131720) : Colors.white,
        border: Border(
          right: BorderSide(
            color: isDark ? Colors.white10 : Colors.black12,
            width: 1,
          ),
        ),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // 1. Brand Logo Header
          Padding(
            padding: const EdgeInsets.fromLTRB(20, 24, 20, 16),
            child: Row(
              children: [
                Container(
                  width: 40,
                  height: 40,
                  decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(10),
                    boxShadow: [
                      BoxShadow(
                        color: Colors.black.withValues(alpha: 0.08),
                        blurRadius: 8,
                        offset: const Offset(0, 2),
                      ),
                    ],
                  ),
                  child: ClipRRect(
                    borderRadius: BorderRadius.circular(10),
                    child: Image.asset(
                      'assets/icon.png',
                      width: 40,
                      height: 40,
                      fit: BoxFit.cover,
                    ),
                  ),
                ),
                const SizedBox(width: 12),
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        'KIFI',
                        style: TextStyle(
                          fontSize: 18,
                          fontWeight: FontWeight.w900,
                          letterSpacing: 1.2,
                          color: isDark ? Colors.white : const Color(0xFF1E293B),
                        ),
                      ),
                      Text(
                        businessProfile?.businessName ?? 'Financial Ledger',
                        style: TextStyle(
                          fontSize: 11,
                          fontWeight: FontWeight.w500,
                          color: isDark ? Colors.white54 : Colors.black45,
                        ),
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                      ),
                    ],
                  ),
                ),
              ],
            ),
          ),

          // 2. Quick Action Button
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 6),
            child: PopupMenuButton<String>(
              onSelected: (action) {
                switch (action) {
                  case 'transaction':
                    Navigator.push(
                      context,
                      MaterialPageRoute(builder: (_) => const AddTransactionScreen()),
                    );
                    break;
                  case 'invoice':
                    Navigator.push(
                      context,
                      MaterialPageRoute(builder: (_) => const InvoiceBuilderScreen()),
                    );
                    break;
                  case 'po':
                    Navigator.push(
                      context,
                      MaterialPageRoute(builder: (_) => const PurchaseOrderBuilderScreen()),
                    );
                    break;
                  case 'product':
                    Navigator.push(
                      context,
                      MaterialPageRoute(builder: (_) => const AddProductScreen()),
                    );
                    break;
                }
              },
              itemBuilder: (context) => [
                const PopupMenuItem(
                  value: 'transaction',
                  child: Row(
                    children: [
                      Icon(LucideIcons.arrowDownUp, size: 18, color: Colors.blueAccent),
                      SizedBox(width: 12),
                      Text('New Transaction'),
                    ],
                  ),
                ),
                if (isBusinessMode) ...[
                  const PopupMenuItem(
                    value: 'invoice',
                    child: Row(
                      children: [
                        Icon(LucideIcons.fileText, size: 18, color: Colors.green),
                        SizedBox(width: 12),
                        Text('New Sales Invoice'),
                      ],
                    ),
                  ),
                  const PopupMenuItem(
                    value: 'po',
                    child: Row(
                      children: [
                        Icon(LucideIcons.shoppingBag, size: 18, color: Colors.purpleAccent),
                        SizedBox(width: 12),
                        Text('New Purchase Order'),
                      ],
                    ),
                  ),
                  const PopupMenuItem(
                    value: 'product',
                    child: Row(
                      children: [
                        Icon(LucideIcons.packagePlus, size: 18, color: Color(0xFFD4AF37)),
                        SizedBox(width: 12),
                        Text('Add Inventory Product'),
                      ],
                    ),
                  ),
                ],
              ],
              child: Container(
                width: double.infinity,
                padding: const EdgeInsets.symmetric(vertical: 11, horizontal: 14),
                decoration: BoxDecoration(
                  gradient: LinearGradient(
                    colors: isDark
                        ? [const Color(0xFF2563EB), const Color(0xFF1D4ED8)]
                        : [const Color(0xFF3B82F6), const Color(0xFF2563EB)],
                  ),
                  borderRadius: BorderRadius.circular(10),
                  boxShadow: [
                    BoxShadow(
                      color: const Color(0xFF2563EB).withValues(alpha: 0.3),
                      blurRadius: 8,
                      offset: const Offset(0, 3),
                    ),
                  ],
                ),
                child: const Row(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    Icon(LucideIcons.plus, color: Colors.white, size: 18),
                    SizedBox(width: 8),
                    Text(
                      'Create New',
                      style: TextStyle(
                        color: Colors.white,
                        fontWeight: FontWeight.w600,
                        fontSize: 13,
                      ),
                    ),
                    Spacer(),
                    Icon(LucideIcons.chevronDown, color: Colors.white70, size: 16),
                  ],
                ),
              ),
            ),
          ),

          const SizedBox(height: 8),

          // 3. Navigation List
          Expanded(
            child: ListView(
              padding: const EdgeInsets.symmetric(horizontal: 12),
              children: [
                _buildNavItem(
                  context,
                  index: 0,
                  icon: LucideIcons.layoutDashboard,
                  label: 'Dashboard',
                  isSelected: selectedIndex == 0,
                ),
                _buildNavItem(
                  context,
                  index: 1,
                  icon: LucideIcons.arrowDownUp,
                  label: 'Transactions',
                  isSelected: selectedIndex == 1,
                ),
                _buildNavItem(
                  context,
                  index: 2,
                  icon: LucideIcons.wallet,
                  label: 'Wallets & Accounts',
                  isSelected: selectedIndex == 2,
                ),
                _buildNavItem(
                  context,
                  index: 3,
                  icon: LucideIcons.target,
                  label: 'Budgets & Goals',
                  isSelected: selectedIndex == 3,
                ),

                if (isBusinessMode) ...[
                  const Padding(
                    padding: EdgeInsets.fromLTRB(12, 20, 12, 8),
                    child: Text(
                      'BUSINESS & ERP',
                      style: TextStyle(
                        fontSize: 10,
                        fontWeight: FontWeight.w700,
                        letterSpacing: 1.1,
                        color: Colors.grey,
                      ),
                    ),
                  ),
                  _buildNavItem(
                    context,
                    index: 4,
                    icon: LucideIcons.briefcase,
                    label: 'Business Hub',
                    isSelected: selectedIndex == 4,
                  ),
                ],
              ],
            ),
          ),

          // 4. Live Metal Rate Widget in Sidebar (Jewellery only)
          if (isJewellery)
            ratesAsync.when(
            data: (rates) {
              if (rates.isEmpty) return const SizedBox.shrink();
              final goldRate = rates.firstWhere(
                (r) => r.commodityCode == 'GOLD',
                orElse: () => rates.first,
              );
              return Container(
                margin: const EdgeInsets.symmetric(horizontal: 14, vertical: 8),
                padding: const EdgeInsets.all(12),
                decoration: BoxDecoration(
                  color: isDark ? const Color(0xFF1E2330) : const Color(0xFFF8FAFC),
                  borderRadius: BorderRadius.circular(10),
                  border: Border.all(
                    color: const Color(0xFFD4AF37).withValues(alpha: 0.2),
                  ),
                ),
                child: Row(
                  children: [
                    const Icon(LucideIcons.coins, color: Color(0xFFD4AF37), size: 18),
                    const SizedBox(width: 10),
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            'Gold (24K/10g)',
                            style: TextStyle(
                              fontSize: 10,
                              fontWeight: FontWeight.w500,
                              color: isDark ? Colors.white60 : Colors.black54,
                            ),
                          ),
                          Text(
                            '₹${(goldRate.rate * 10).toStringAsFixed(0)}',
                            style: const TextStyle(
                              fontSize: 13,
                              fontWeight: FontWeight.bold,
                              color: Color(0xFFD4AF37),
                            ),
                          ),
                        ],
                      ),
                    ),
                    const Icon(LucideIcons.trendingUp, color: Colors.green, size: 16),
                  ],
                ),
              );
            },
            loading: () => const SizedBox.shrink(),
            error: (_, __) => const SizedBox.shrink(),
          ),

          // 5. Sidebar Footer (Profile & Settings)
          Container(
            padding: const EdgeInsets.fromLTRB(14, 12, 14, 16),
            decoration: BoxDecoration(
              border: Border(
                top: BorderSide(
                  color: isDark ? Colors.white10 : Colors.black12,
                ),
              ),
            ),
            child: Row(
              children: [
                Expanded(
                  child: InkWell(
                    onTap: () {
                      Navigator.push(
                        context,
                        MaterialPageRoute(builder: (_) => const ProfileScreen()),
                      );
                    },
                    borderRadius: BorderRadius.circular(8),
                    child: Padding(
                      padding: const EdgeInsets.all(4),
                      child: Row(
                        children: [
                          CircleAvatar(
                            radius: 16,
                            backgroundColor: isDark ? const Color(0xFF2563EB) : const Color(0xFF3B82F6),
                            child: const Icon(LucideIcons.user, size: 16, color: Colors.white),
                          ),
                          const SizedBox(width: 10),
                          Expanded(
                            child: Text(
                              'Profile & Settings',
                              style: TextStyle(
                                fontSize: 13,
                                fontWeight: FontWeight.w600,
                                color: isDark ? Colors.white : Colors.black87,
                              ),
                              overflow: TextOverflow.ellipsis,
                            ),
                          ),
                        ],
                      ),
                    ),
                  ),
                ),
                IconButton(
                  tooltip: 'Settings',
                  icon: const Icon(LucideIcons.settings, size: 18),
                  onPressed: () {
                    Navigator.push(
                      context,
                      MaterialPageRoute(builder: (_) => const ProfileScreen()),
                    );
                  },
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildNavItem(
    BuildContext context, {
    required int index,
    required IconData icon,
    required String label,
    required bool isSelected,
  }) {
    final theme = Theme.of(context);
    final isDark = theme.brightness == Brightness.dark;

    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 2),
      child: InkWell(
        onTap: () => onDestinationSelected(index),
        borderRadius: BorderRadius.circular(10),
        child: Container(
          padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
          decoration: BoxDecoration(
            color: isSelected
                ? (isDark
                    ? const Color(0xFF2563EB).withValues(alpha: 0.18)
                    : const Color(0xFF2563EB).withValues(alpha: 0.1))
                : Colors.transparent,
            borderRadius: BorderRadius.circular(10),
            border: isSelected
                ? Border.all(
                    color: const Color(0xFF2563EB).withValues(alpha: 0.3),
                  )
                : null,
          ),
          child: Row(
            children: [
              Icon(
                icon,
                size: 19,
                color: isSelected
                    ? const Color(0xFF3B82F6)
                    : (isDark ? Colors.white60 : Colors.black54),
              ),
              const SizedBox(width: 12),
              Text(
                label,
                style: TextStyle(
                  fontSize: 13,
                  fontWeight: isSelected ? FontWeight.w700 : FontWeight.w500,
                  color: isSelected
                      ? (isDark ? Colors.white : const Color(0xFF1D4ED8))
                      : (isDark ? Colors.white70 : Colors.black87),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}