import 'package:flutter/material.dart';
import 'package:intl/intl.dart';

import '../models/order_detail.dart';
import '../services/api.dart';

class OrderDetailScreen extends StatefulWidget {
  final int orderId;

  const OrderDetailScreen({super.key, required this.orderId});

  @override
  State<OrderDetailScreen> createState() => _OrderDetailScreenState();
}

class _OrderDetailScreenState extends State<OrderDetailScreen> {
  OrderDetail? _order;
  bool _isLoading = true;
  String? _error;

  @override
  void initState() {
    super.initState();
    _loadOrder();
  }

  Future<void> _loadOrder() async {
    setState(() {
      _isLoading = true;
      _error = null;
    });

    try {
      final order = await Api.getOrderDetail(orderId: widget.orderId);
      if (mounted) {
        setState(() {
          _order = order;
          _isLoading = false;
        });
      }
    } catch (e) {
      debugPrint('Error loading order detail: $e');
      if (mounted) {
        setState(() {
          _error = e.toString();
          _isLoading = false;
        });
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Order #${widget.orderId}'),
      ),
      body: _buildBody(),
    );
  }

  Widget _buildBody() {
    if (_isLoading) {
      return const Center(child: CircularProgressIndicator());
    }

    if (_error != null) {
      return Center(
        child: Padding(
          padding: const EdgeInsets.all(24),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Icon(
                Icons.error_outline,
                size: 48,
                color: Theme.of(context).colorScheme.error,
              ),
              const SizedBox(height: 16),
              Text(
                'Failed to load order',
                style: Theme.of(context).textTheme.titleMedium,
              ),
              const SizedBox(height: 8),
              Text(
                _error!,
                textAlign: TextAlign.center,
                style: Theme.of(context).textTheme.bodySmall,
              ),
              const SizedBox(height: 24),
              FilledButton.icon(
                onPressed: _loadOrder,
                icon: const Icon(Icons.refresh),
                label: const Text('Retry'),
              ),
            ],
          ),
        ),
      );
    }

    final order = _order;
    if (order == null) {
      return const Center(child: Text('Order not found'));
    }

    return RefreshIndicator(
      onRefresh: _loadOrder,
      child: SingleChildScrollView(
        physics: const AlwaysScrollableScrollPhysics(),
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            _buildOrderHeader(order),
            const SizedBox(height: 16),
            _buildStatusCard(order),
            const SizedBox(height: 16),
            _buildItemsCard(order),
            const SizedBox(height: 16),
            _buildTotalsCard(order),
            if (order.notes.isNotEmpty) ...[
              const SizedBox(height: 16),
              _buildNotesCard(order),
            ],
            const SizedBox(height: 32),
          ],
        ),
      ),
    );
  }

  Widget _buildOrderHeader(OrderDetail order) {
    final dateFormat = DateFormat('MMM d, yyyy');
    final timeFormat = DateFormat('h:mm a');
    final displayDate = order.submittedOn ?? order.createdOn;

    return Card(
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                Expanded(
                  child: Text(
                    order.businessName.isNotEmpty ? order.businessName : 'Order',
                    style: Theme.of(context).textTheme.titleLarge?.copyWith(
                          fontWeight: FontWeight.bold,
                        ),
                  ),
                ),
                _buildOrderTypeChip(order.orderTypeId, order.orderTypeName),
              ],
            ),
            const SizedBox(height: 8),
            Row(
              children: [
                Icon(
                  Icons.calendar_today,
                  size: 14,
                  color: Theme.of(context).colorScheme.onSurfaceVariant,
                ),
                const SizedBox(width: 4),
                Text(
                  '${dateFormat.format(displayDate)} at ${timeFormat.format(displayDate)}',
                  style: Theme.of(context).textTheme.bodySmall?.copyWith(
                        color: Theme.of(context).colorScheme.onSurfaceVariant,
                      ),
                ),
              ],
            ),
            if (order.servicePoint.name.isNotEmpty) ...[
              const SizedBox(height: 4),
              Row(
                children: [
                  Icon(
                    Icons.table_restaurant,
                    size: 14,
                    color: Theme.of(context).colorScheme.onSurfaceVariant,
                  ),
                  const SizedBox(width: 4),
                  Text(
                    order.servicePoint.name,
                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
                          color: Theme.of(context).colorScheme.onSurfaceVariant,
                        ),
                  ),
                ],
              ),
            ],
          ],
        ),
      ),
    );
  }

  Widget _buildOrderTypeChip(int typeId, String typeName) {
    IconData icon;
    Color color;

    switch (typeId) {
      case 1: // Dine-in
        icon = Icons.restaurant;
        color = Colors.orange;
        break;
      case 2: // Takeaway
        icon = Icons.shopping_bag;
        color = Colors.blue;
        break;
      case 3: // Delivery
        icon = Icons.delivery_dining;
        color = Colors.green;
        break;
      default:
        icon = Icons.receipt;
        color = Colors.grey;
    }

    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
      decoration: BoxDecoration(
        color: color.withOpacity(0.1),
        borderRadius: BorderRadius.circular(12),
        border: Border.all(color: color.withOpacity(0.3)),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          Icon(icon, size: 14, color: color),
          const SizedBox(width: 4),
          Text(
            typeName,
            style: TextStyle(
              color: color,
              fontSize: 12,
              fontWeight: FontWeight.w500,
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildStatusCard(OrderDetail order) {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Row(
          children: [
            _buildStatusIcon(order.status),
            const SizedBox(width: 12),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    'Status',
                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
                          color: Theme.of(context).colorScheme.onSurfaceVariant,
                        ),
                  ),
                  Text(
                    order.statusText,
                    style: Theme.of(context).textTheme.titleMedium?.copyWith(
                          fontWeight: FontWeight.w600,
                        ),
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildStatusIcon(int status) {
    IconData icon;
    Color color;

    switch (status) {
      case 1: // Submitted
        icon = Icons.send;
        color = Colors.blue;
        break;
      case 2: // In Progress
        icon = Icons.pending;
        color = Colors.orange;
        break;
      case 3: // Ready
        icon = Icons.check_circle_outline;
        color = Colors.green;
        break;
      case 4: // Completed
        icon = Icons.check_circle;
        color = Colors.green;
        break;
      case 5: // Cancelled
        icon = Icons.cancel;
        color = Colors.red;
        break;
      default: // Cart or Unknown
        icon = Icons.shopping_cart;
        color = Colors.grey;
    }

    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: color.withOpacity(0.1),
        shape: BoxShape.circle,
      ),
      child: Icon(icon, color: color, size: 24),
    );
  }

  Widget _buildItemsCard(OrderDetail order) {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              'Items',
              style: Theme.of(context).textTheme.titleMedium?.copyWith(
                    fontWeight: FontWeight.w600,
                  ),
            ),
            const SizedBox(height: 12),
            ...order.lineItems.map((item) => _buildLineItem(item)),
          ],
        ),
      ),
    );
  }

  Widget _buildLineItem(OrderLineItemDetail item) {
    final nonDefaultMods = item.nonDefaultModifiers;

    return Padding(
      padding: const EdgeInsets.only(bottom: 12),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              // Quantity badge
              Container(
                padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
                decoration: BoxDecoration(
                  color: Theme.of(context).colorScheme.primaryContainer,
                  borderRadius: BorderRadius.circular(4),
                ),
                child: Text(
                  '${item.quantity}x',
                  style: TextStyle(
                    color: Theme.of(context).colorScheme.onPrimaryContainer,
                    fontSize: 12,
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ),
              const SizedBox(width: 8),
              // Item name
              Expanded(
                child: Text(
                  item.itemName,
                  style: Theme.of(context).textTheme.bodyLarge?.copyWith(
                        fontWeight: FontWeight.w500,
                      ),
                ),
              ),
              // Price
              Text(
                '\$${item.totalPrice.toStringAsFixed(2)}',
                style: Theme.of(context).textTheme.bodyLarge?.copyWith(
                      fontWeight: FontWeight.w500,
                    ),
              ),
            ],
          ),
          // Non-default modifiers
          if (nonDefaultMods.isNotEmpty) ...[
            const SizedBox(height: 4),
            Padding(
              padding: const EdgeInsets.only(left: 36),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: nonDefaultMods.map((mod) {
                  final modPrice = mod.unitPrice > 0
                      ? ' (+\$${mod.unitPrice.toStringAsFixed(2)})'
                      : '';
                  return Padding(
                    padding: const EdgeInsets.only(top: 2),
                    child: Text(
                      '+ ${mod.itemName}$modPrice',
                      style: Theme.of(context).textTheme.bodySmall?.copyWith(
                            color: Theme.of(context).colorScheme.onSurfaceVariant,
                          ),
                    ),
                  );
                }).toList(),
              ),
            ),
          ],
          // Item remarks/notes
          if (item.remarks.isNotEmpty) ...[
            const SizedBox(height: 4),
            Padding(
              padding: const EdgeInsets.only(left: 36),
              child: Text(
                '"${item.remarks}"',
                style: Theme.of(context).textTheme.bodySmall?.copyWith(
                      color: Colors.orange[700],
                      fontStyle: FontStyle.italic,
                    ),
              ),
            ),
          ],
          const Divider(height: 16),
        ],
      ),
    );
  }

  Widget _buildTotalsCard(OrderDetail order) {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          children: [
            _buildTotalRow('Subtotal', order.subtotal),
            const SizedBox(height: 8),
            _buildTotalRow('Tax', order.tax),
            if (order.tip > 0) ...[
              const SizedBox(height: 8),
              _buildTotalRow('Tip', order.tip),
            ],
            const Divider(height: 16),
            _buildTotalRow('Total', order.total, isTotal: true),
          ],
        ),
      ),
    );
  }

  Widget _buildTotalRow(String label, double amount, {bool isTotal = false}) {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      children: [
        Text(
          label,
          style: isTotal
              ? Theme.of(context).textTheme.titleMedium?.copyWith(
                    fontWeight: FontWeight.bold,
                  )
              : Theme.of(context).textTheme.bodyMedium,
        ),
        Text(
          '\$${amount.toStringAsFixed(2)}',
          style: isTotal
              ? Theme.of(context).textTheme.titleMedium?.copyWith(
                    fontWeight: FontWeight.bold,
                    color: Theme.of(context).colorScheme.primary,
                  )
              : Theme.of(context).textTheme.bodyMedium,
        ),
      ],
    );
  }

  Widget _buildNotesCard(OrderDetail order) {
    return Card(
      color: Colors.amber[50],
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Row(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Icon(Icons.note, color: Colors.amber[700], size: 20),
            const SizedBox(width: 12),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    'Order Notes',
                    style: TextStyle(
                      fontSize: 12,
                      color: Colors.amber[800],
                      fontWeight: FontWeight.w600,
                    ),
                  ),
                  const SizedBox(height: 4),
                  Text(
                    order.notes,
                    style: TextStyle(
                      fontSize: 14,
                      color: Colors.amber[900],
                    ),
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}