import 'package:enaklo_pos/core/components/buttons.dart';
import 'package:enaklo_pos/core/components/spaces.dart';
import 'package:enaklo_pos/core/constants/colors.dart';
import 'package:enaklo_pos/core/extensions/build_context_ext.dart';
import 'package:enaklo_pos/core/extensions/int_ext.dart';
import 'package:enaklo_pos/data/models/response/order_response_model.dart';
import 'package:enaklo_pos/presentation/void/bloc/void_order_bloc.dart';
import 'package:enaklo_pos/presentation/void/dialog/confirm_void_dialog.dart';
import 'package:enaklo_pos/presentation/void/pages/success_void_page.dart';
import 'package:enaklo_pos/presentation/void/widgets/product_card.dart';
import 'package:enaklo_pos/presentation/void/widgets/void_radio.dart';
import 'package:enaklo_pos/presentation/void/widgets/void_loading.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';

class VoidPage extends StatefulWidget {
  final Order selectedOrder;

  const VoidPage({super.key, required this.selectedOrder});

  @override
  State<VoidPage> createState() => _VoidPageState();
}

class _VoidPageState extends State<VoidPage> {
  String voidType = 'all'; // 'all' or 'item'
  Map<String, int> selectedItemQuantities = {}; // itemId -> voidQuantity
  String voidReason = '';
  final TextEditingController reasonController = TextEditingController();
  final ScrollController _leftPanelController = ScrollController();
  final ScrollController _rightPanelController = ScrollController();

  @override
  void dispose() {
    _leftPanelController.dispose();
    _rightPanelController.dispose();
    reasonController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return BlocListener<VoidOrderBloc, VoidOrderState>(
      listener: (context, state) {
        state.when(
          initial: () {},
          loading: () {
            // Show loading indicator if needed
          },
          success: () {
            context.pushReplacement(
              SuccessVoidPage(
                voidedOrder: widget.selectedOrder,
                voidType: voidType,
                voidAmount: _calculateVoidAmount(),
                voidReason: voidReason,
                voidedItems: voidType == 'item' ? _getVoidedItems() : null,
              ),
            );
          },
          error: (message) {
            _showErrorDialog(message);
          },
        );
      },
      child: Scaffold(
        backgroundColor: Colors.grey[100],
        body: BlocBuilder<VoidOrderBloc, VoidOrderState>(
          builder: (context, state) {
            return Stack(
              children: [
                OrientationBuilder(
                  builder: (context, orientation) {
                    return Padding(
                      padding: EdgeInsets.all(24.0),
                      child: Row(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          // Left Panel - Order Details & Items
                          Expanded(
                            flex: 3,
                            child: _buildOrderDetailsPanel(),
                          ),
                          SpaceWidth(24),
                          // Right Panel - Void Configuration
                          Expanded(
                            flex: 2,
                            child: _buildVoidConfigPanel(),
                          ),
                        ],
                      ),
                    );
                  },
                ),
                // Loading Overlay
                state.when(
                  initial: () => SizedBox.shrink(),
                  loading: () => VoidLoading(),
                  success: () => SizedBox.shrink(),
                  error: (message) => SizedBox.shrink(),
                ),
              ],
            );
          },
        ),
      ),
    );
  }

  Widget _buildOrderDetailsPanel() {
    return Container(
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(12),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // Order Header - Fixed
          Container(
            padding: EdgeInsets.all(20),
            decoration: BoxDecoration(
              color: AppColors.primary.withOpacity(0.1),
              borderRadius: BorderRadius.only(
                topLeft: Radius.circular(12),
                topRight: Radius.circular(12),
              ),
            ),
            child: Row(
              children: [
                Icon(Icons.receipt_long, color: AppColors.primary, size: 24),
                SpaceWidth(12),
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        'Pesanan #${widget.selectedOrder.orderNumber}',
                        style: TextStyle(
                          fontSize: 20,
                          fontWeight: FontWeight.bold,
                          color: AppColors.primary,
                        ),
                      ),
                      Text(
                        'Meja: ${widget.selectedOrder.tableNumber ?? 'N/A'} • ${widget.selectedOrder.orderType ?? 'N/A'}',
                        style: TextStyle(
                          fontSize: 14,
                          color: Colors.grey[600],
                        ),
                      ),
                    ],
                  ),
                ),
                Container(
                  padding: EdgeInsets.symmetric(horizontal: 12, vertical: 6),
                  decoration: BoxDecoration(
                    color: _getStatusColor(widget.selectedOrder.status)
                        .withOpacity(0.2),
                    borderRadius: BorderRadius.circular(16),
                  ),
                  child: Text(
                    widget.selectedOrder.status?.toUpperCase() ?? 'UNKNOWN',
                    style: TextStyle(
                      fontSize: 12,
                      fontWeight: FontWeight.w600,
                      color: _getStatusColor(widget.selectedOrder.status),
                    ),
                  ),
                ),
              ],
            ),
          ),

          // Scrollable Content
          Expanded(
            child: Scrollbar(
              controller: _leftPanelController,
              thumbVisibility: true,
              child: SingleChildScrollView(
                controller: _leftPanelController,
                padding: EdgeInsets.all(20),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    // Order Summary - Fixed in scroll
                    Container(
                      padding: EdgeInsets.all(16),
                      decoration: BoxDecoration(
                        color: Colors.grey[50],
                        borderRadius: BorderRadius.circular(8),
                        border: Border.all(color: Colors.grey[300]!),
                      ),
                      child: Column(
                        children: [
                          _buildSummaryRow(
                              'Subtotal:',
                              (widget.selectedOrder.subtotal ?? 0)
                                  .currencyFormatRpV2),
                          _buildSummaryRow(
                              'Pajak:',
                              (widget.selectedOrder.taxAmount ?? 0)
                                  .currencyFormatRpV2),
                          _buildSummaryRow('Diskon:',
                              '- ${(widget.selectedOrder.discountAmount ?? 0).currencyFormatRpV2}'),
                          Divider(thickness: 1),
                          _buildSummaryRow(
                            'Total:',
                            (widget.selectedOrder.totalAmount ?? 0)
                                .currencyFormatRpV2,
                            isTotal: true,
                          ),
                          if (voidType == 'item' &&
                              selectedItemQuantities.isNotEmpty) ...[
                            Divider(thickness: 1, color: Colors.red[300]),
                            _buildSummaryRow(
                              'Total Void:',
                              '- ${(_calculateVoidAmount().currencyFormatRpV2)}',
                              isVoid: true,
                            ),
                          ],
                        ],
                      ),
                    ),

                    SpaceHeight(24),

                    // Order Items Section Title
                    Row(
                      children: [
                        Icon(Icons.shopping_cart,
                            color: AppColors.primary, size: 20),
                        SpaceWidth(8),
                        Text(
                          'Produk Pesanan (${_getPendingItem().length})',
                          style: TextStyle(
                            fontSize: 16,
                            fontWeight: FontWeight.bold,
                            color: AppColors.primary,
                          ),
                        ),
                      ],
                    ),

                    SpaceHeight(16),

                    // Order Items List - Scrollable
                    ...List.generate(
                      _getPendingItem().length,
                      (index) {
                        final item = _getPendingItem()[index];
                        final voidQty = selectedItemQuantities[item.id] ?? 0;
                        final isSelected = voidQty > 0;
                        final canSelect = voidType == 'item';

                        return VoidProductCard(
                          isSelected: isSelected,
                          item: item,
                          voidQty: voidQty,
                          canSelect: canSelect,
                          onTapDecrease: voidQty > 0
                              ? () {
                                  setState(() {
                                    if (voidQty == 1) {
                                      selectedItemQuantities.remove(item.id);
                                    } else {
                                      selectedItemQuantities[item.id!] =
                                          voidQty - 1;
                                    }
                                  });
                                }
                              : null,
                          onTapIncrease: voidQty < (item.quantity ?? 0)
                              ? () {
                                  setState(() {
                                    selectedItemQuantities[item.id!] =
                                        voidQty + 1;
                                  });
                                }
                              : null,
                          onTapAll: () {
                            setState(() {
                              selectedItemQuantities[item.id!] =
                                  item.quantity ?? 0;
                            });
                          },
                          onTapClear: voidQty > 0
                              ? () {
                                  setState(() {
                                    selectedItemQuantities.remove(item.id);
                                  });
                                }
                              : null,
                        );
                      },
                    ),
                  ],
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildVoidConfigPanel() {
    return Container(
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(12),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // Header - Fixed
          Container(
            padding: EdgeInsets.all(20),
            decoration: BoxDecoration(
              color: Colors.red.withOpacity(0.1),
              borderRadius: BorderRadius.only(
                topLeft: Radius.circular(12),
                topRight: Radius.circular(12),
              ),
            ),
            child: Row(
              children: [
                Icon(Icons.cancel, color: Colors.red, size: 24),
                SpaceWidth(12),
                Text(
                  'Konfigurasi Void',
                  style: TextStyle(
                    fontSize: 20,
                    fontWeight: FontWeight.bold,
                    color: Colors.red,
                  ),
                ),
              ],
            ),
          ),

          // Scrollable Content
          Expanded(
            child: Scrollbar(
              controller: _rightPanelController,
              thumbVisibility: true,
              child: SingleChildScrollView(
                controller: _rightPanelController,
                padding: EdgeInsets.all(20),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    // Void Type Selection
                    Text(
                      'Tipe Void *',
                      style: TextStyle(
                        fontSize: 16,
                        fontWeight: FontWeight.bold,
                        color: AppColors.primary,
                      ),
                    ),
                    SpaceHeight(12),

                    // Void All Option
                    VoidRadio(
                      voidType: voidType,
                      value: 'all',
                      title: 'Batalkan Seluruh Pesanan',
                      subtitle: "Batalkan pesanan lengkap dan semua item",
                      onChanged: (String? value) {
                        setState(() {
                          voidType = value!;
                          selectedItemQuantities.clear();
                        });
                      },
                    ),

                    SpaceHeight(12),

                    // Void Items Option
                    VoidRadio(
                      voidType: voidType,
                      value: 'item',
                      title: 'Batalkan Barang/Jumlah Tertentu',
                      subtitle:
                          "Mengurangi atau membatalkan jumlah item tertentu",
                      onChanged: (String? value) {
                        setState(() {
                          voidType = value!;
                          selectedItemQuantities.clear();
                        });
                      },
                    ),

                    SpaceHeight(24),

                    // Selected Items Summary (only show for item void)
                    if (voidType == 'item') ...[
                      Container(
                        padding: EdgeInsets.all(16),
                        decoration: BoxDecoration(
                          color: selectedItemQuantities.isEmpty
                              ? Colors.orange[50]
                              : Colors.green[50],
                          borderRadius: BorderRadius.circular(8),
                          border: Border.all(
                            color: selectedItemQuantities.isEmpty
                                ? Colors.orange[300]!
                                : Colors.green[300]!,
                          ),
                        ),
                        child: Column(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: [
                            Row(
                              children: [
                                Icon(
                                  selectedItemQuantities.isEmpty
                                      ? Icons.warning
                                      : Icons.check_circle,
                                  color: selectedItemQuantities.isEmpty
                                      ? Colors.orange[700]
                                      : Colors.green[700],
                                  size: 20,
                                ),
                                SpaceWidth(8),
                                Expanded(
                                  child: Text(
                                    selectedItemQuantities.isEmpty
                                        ? 'Silakan pilih item dan jumlah yang akan dibatalkan'
                                        : 'Item yang dipilih untuk dibatalkan:',
                                    style: TextStyle(
                                      fontSize: 14,
                                      fontWeight: FontWeight.w500,
                                      color: selectedItemQuantities.isEmpty
                                          ? Colors.orange[700]
                                          : Colors.green[700],
                                    ),
                                  ),
                                ),
                              ],
                            ),
                            if (selectedItemQuantities.isNotEmpty) ...[
                              SpaceHeight(12),
                              Container(
                                constraints: BoxConstraints(maxHeight: 150),
                                child: Scrollbar(
                                  child: SingleChildScrollView(
                                    child: Column(
                                      crossAxisAlignment:
                                          CrossAxisAlignment.start,
                                      children: selectedItemQuantities.entries
                                          .map((entry) {
                                        final item = widget
                                            .selectedOrder.orderItems!
                                            .firstWhere(
                                                (item) => item.id == entry.key);
                                        return Container(
                                          margin: EdgeInsets.only(bottom: 8),
                                          padding: EdgeInsets.all(8),
                                          decoration: BoxDecoration(
                                            color: Colors.white,
                                            borderRadius:
                                                BorderRadius.circular(6),
                                            border: Border.all(
                                                color: Colors.green[200]!),
                                          ),
                                          child: Row(
                                            children: [
                                              Expanded(
                                                child: Column(
                                                  crossAxisAlignment:
                                                      CrossAxisAlignment.start,
                                                  children: [
                                                    Text(
                                                      item.productName ??
                                                          'Unknown',
                                                      style: TextStyle(
                                                        fontSize: 12,
                                                        fontWeight:
                                                            FontWeight.w500,
                                                      ),
                                                    ),
                                                    Text(
                                                      'Qty: ${entry.value}',
                                                      style: TextStyle(
                                                        fontSize: 11,
                                                        color: Colors.grey[600],
                                                      ),
                                                    ),
                                                  ],
                                                ),
                                              ),
                                              Text(
                                                ((item.unitPrice ?? 0) *
                                                        entry.value)
                                                    .currencyFormatRpV2,
                                                style: TextStyle(
                                                  fontSize: 12,
                                                  fontWeight: FontWeight.bold,
                                                  color: Colors.red[700],
                                                ),
                                              ),
                                            ],
                                          ),
                                        );
                                      }).toList(),
                                    ),
                                  ),
                                ),
                              ),
                              Divider(height: 16, thickness: 1),
                              Container(
                                padding: EdgeInsets.all(8),
                                decoration: BoxDecoration(
                                  color: Colors.red.withOpacity(0.1),
                                  borderRadius: BorderRadius.circular(6),
                                ),
                                child: Row(
                                  mainAxisAlignment:
                                      MainAxisAlignment.spaceBetween,
                                  children: [
                                    Text(
                                      'Jumlah Total Void:',
                                      style: TextStyle(
                                        fontSize: 14,
                                        fontWeight: FontWeight.bold,
                                      ),
                                    ),
                                    Text(
                                      _calculateVoidAmount().currencyFormatRpV2,
                                      style: TextStyle(
                                        fontSize: 14,
                                        fontWeight: FontWeight.bold,
                                        color: Colors.red[700],
                                      ),
                                    ),
                                  ],
                                ),
                              ),
                            ],
                          ],
                        ),
                      ),
                      SpaceHeight(24),
                    ],

                    // Void Reason
                    Text(
                      'Alasan Void *',
                      style: TextStyle(
                        fontSize: 16,
                        fontWeight: FontWeight.bold,
                        color: AppColors.primary,
                      ),
                    ),
                    SpaceHeight(8),
                    TextField(
                      controller: reasonController,
                      maxLines: 4,
                      decoration: InputDecoration(
                        hintText: 'Harap berikan alasan untuk membatalkan...',
                        border: OutlineInputBorder(
                          borderRadius: BorderRadius.circular(8),
                          borderSide: BorderSide(color: Colors.grey[300]!),
                        ),
                        focusedBorder: OutlineInputBorder(
                          borderRadius: BorderRadius.circular(8),
                          borderSide:
                              BorderSide(color: AppColors.primary, width: 2),
                        ),
                        contentPadding: EdgeInsets.all(16),
                      ),
                      onChanged: (value) {
                        setState(() {
                          voidReason = value;
                        });
                      },
                    ),

                    SpaceHeight(32),

                    // Action Buttons
                    Row(
                      children: [
                        Expanded(
                          child: Button.outlined(
                            onPressed: () => context.pop(),
                            label: 'Batal',
                          ),
                        ),
                        SpaceWidth(12),
                        Expanded(
                          child: Button.filled(
                            onPressed: _canProcessVoid() ? _processVoid : null,
                            label: voidType == 'all'
                                ? 'Void Pesanan'
                                : 'Void Produk',
                          ),
                        ),
                      ],
                    ),
                  ],
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildSummaryRow(String label, String value,
      {bool isTotal = false, bool isVoid = false}) {
    return Padding(
      padding: EdgeInsets.symmetric(vertical: 4),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Text(
            label,
            style: TextStyle(
              fontSize: isTotal ? 16 : 14,
              fontWeight: isTotal ? FontWeight.bold : FontWeight.normal,
              color: isVoid
                  ? Colors.red
                  : (isTotal ? AppColors.primary : Colors.grey[700]),
            ),
          ),
          Text(
            value,
            style: TextStyle(
              fontSize: isTotal ? 16 : 14,
              fontWeight: isTotal ? FontWeight.bold : FontWeight.w500,
              color: isVoid
                  ? Colors.red
                  : (isTotal ? AppColors.primary : Colors.grey[700]),
            ),
          ),
        ],
      ),
    );
  }

  Color _getStatusColor(String? status) {
    switch (status?.toLowerCase()) {
      case 'completed':
        return Colors.green;
      case 'pending':
        return Colors.orange;
      case 'cancelled':
        return Colors.red;
      case 'processing':
        return Colors.blue;
      default:
        return Colors.grey;
    }
  }

  int _calculateVoidAmount() {
    int total = 0;
    selectedItemQuantities.forEach((itemId, voidQty) {
      final item = widget.selectedOrder.orderItems!
          .firstWhere((item) => item.id == itemId);
      total += (item.unitPrice ?? 0) * voidQty;
    });
    return total;
  }

  bool _canProcessVoid() {
    if (voidReason.trim().isEmpty) return false;
    if (voidType == 'item' && selectedItemQuantities.isEmpty) return false;
    return true;
  }

  List<OrderItem> _getPendingItem() {
    return widget.selectedOrder.orderItems!
        .where((item) => item.status == 'pending')
        .toList();
  }

  List<OrderItem> _getVoidedItems() {
    List<OrderItem> voidedItems = [];

    selectedItemQuantities.forEach((itemId, voidQty) {
      final originalItem = widget.selectedOrder.orderItems!
          .firstWhere((item) => item.id == itemId);

      // Buat OrderItem baru dengan quantity yang di-void
      voidedItems.add(OrderItem(
        id: originalItem.id,
        orderId: originalItem.orderId,
        productId: originalItem.productId,
        productName: originalItem.productName,
        productVariantId: originalItem.productVariantId,
        productVariantName: originalItem.productVariantName,
        quantity: voidQty, // Hanya quantity yang di-void
        unitPrice: originalItem.unitPrice,
        totalPrice: (originalItem.unitPrice ?? 0) * voidQty,
        modifiers: originalItem.modifiers,
        notes: originalItem.notes,
        status: originalItem.status,
        createdAt: originalItem.createdAt,
        updatedAt: originalItem.updatedAt,
      ));
    });

    return voidedItems;
  }

  void _processVoid() {
    String confirmMessage;
    if (voidType == 'all') {
      confirmMessage =
          'Apakah Anda yakin ingin membatalkan seluruh pesanan #${widget.selectedOrder.orderNumber}?\n\nIni akan membatalkan semua item dalam pesanan.';
    } else {
      int totalItems =
          selectedItemQuantities.values.fold(0, (sum, qty) => sum + qty);
      confirmMessage =
          'Apakah Anda yakin ingin membatalkan $totalItems item dari pesanan #${widget.selectedOrder.orderNumber}?\n\nJumlah Batal: ${(_calculateVoidAmount()).currencyFormatRpV2}';
    }

    showDialog(
      context: context,
      barrierDismissible: false,
      builder: (BuildContext context) {
        return ConfirmVoidDialog(
          message: confirmMessage,
          onTap: _performVoid,
          order: widget.selectedOrder,
          voidType: voidType,
          selectedItemQuantities: selectedItemQuantities,
          voidReason: voidReason,
        );
      },
    );
  }

  void _performVoid() {
    // Prepare order items for void
    List<OrderItem> voidItems = [];

    if (voidType == 'item') {
      selectedItemQuantities.forEach((itemId, voidQty) {
        final originalItem = widget.selectedOrder.orderItems!
            .firstWhere((item) => item.id == itemId);

        // Create new OrderItem with void quantity
        voidItems.add(OrderItem(
          id: originalItem.id,
          orderId: originalItem.orderId,
          productId: originalItem.productId,
          productName: originalItem.productName,
          productVariantId: originalItem.productVariantId,
          productVariantName: originalItem.productVariantName,
          quantity: voidQty, // This is the void quantity
          unitPrice: originalItem.unitPrice,
          totalPrice: (originalItem.unitPrice ?? 0) * voidQty,
          modifiers: originalItem.modifiers,
          notes: originalItem.notes,
          status: originalItem.status,
          createdAt: originalItem.createdAt,
          updatedAt: originalItem.updatedAt,
        ));
      });
    }

    // Trigger void order event
    context.read<VoidOrderBloc>().add(
          VoidOrderEvent.voidOrder(
            orderId: widget.selectedOrder.id!,
            reason: voidReason,
            type: voidType.toUpperCase(),
            orderItems: voidItems,
          ),
        );
  }

  void _showErrorDialog(String message) {
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: Row(
            children: [
              Icon(Icons.error, color: Colors.red),
              SpaceWidth(8),
              Text('Void Gagal'),
            ],
          ),
          content: Text(message),
          actions: [
            ElevatedButton(
              onPressed: () => Navigator.pop(context),
              style: ElevatedButton.styleFrom(
                backgroundColor: AppColors.primary,
                foregroundColor: Colors.white,
              ),
              child: Text('OK'),
            ),
          ],
        );
      },
    );
  }
}