// pages/caisse_screen.dart
import 'package:flutter/material.dart';
import 'package:itrimobe/pages/facture_screen.dart';
import '../models/command_detail.dart';
import '../models/payment_method.dart';
import '../services/restaurant_api_service.dart';
import 'package:intl/intl.dart';

class CaisseScreen extends StatefulWidget {
  final String commandeId;
  final int tableNumber;

  const CaisseScreen({
    super.key,
    required this.commandeId,
    required this.tableNumber,
  });

  @override
  _CaisseScreenState createState() => _CaisseScreenState();
}

class _CaisseScreenState extends State<CaisseScreen> {
  CommandeDetail? commande;
  PaymentMethod? selectedPaymentMethod;
  bool isLoading = true;
  bool isProcessingPayment = false;

  final List<PaymentMethod> paymentMethods = [
    const PaymentMethod(
      id: 'mvola',
      name: 'MVola',
      description: 'Paiement mobile MVola',
      icon: Icons.phone,
      color: Color(0xFF4285F4),
    ),
    const PaymentMethod(
      id: 'orange_money',
      name: 'Orange Money',
      description: 'Paiement mobile Orange Money',
      icon: Icons.phone,
      color: Color(0xFF4285F4),
    ),
    const PaymentMethod(
      id: 'carte',
      name: 'Carte Bancaire',
      description: 'Paiement par carte',
      icon: Icons.credit_card,
      color: Color(0xFF28A745),
    ),
    const PaymentMethod(
      id: 'especes',
      name: 'Espèces',
      description: 'Paiement en liquide',
      icon: Icons.attach_money,
      color: Color(0xFFFF9500),
    ),
  ];

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

  Future<void> _loadCommandeDetails() async {
    setState(() => isLoading = true);

    try {
      final result = await RestaurantApiService.getCommandeDetails(
        widget.commandeId,
      );
      setState(() {
        commande = result;
        isLoading = false;
      });
    } catch (e) {
      setState(() => isLoading = false);
      _showErrorDialog(
        'Erreur lors du chargement des détails de la commande: $e',
      );
    }
  }

  // Dans caisse_screen.dart, modifiez la méthode _processPayment
 Future<void> _processPayment() async {
  if (selectedPaymentMethod == null || commande == null) return;

  setState(() => isProcessingPayment = true);

  try {
    final success = await RestaurantApiService.processPayment(
      commandeId: widget.commandeId,
      paymentMethodId: selectedPaymentMethod!.id,
      amount: commande!.totalTtc,
    );

    if (success) {
      final updateSuccess = await RestaurantApiService.updateCommandeStatus(
        commandeId: widget.commandeId,
        newStatus: 'payee',
      );

      if (!updateSuccess) {
        _showErrorDialog("Paiement effectué, mais échec lors de la mise à jour du statut.");
        return;
      }

      // 🔄 Redirige vers la facture
      Navigator.of(context).pushReplacement(
        MaterialPageRoute(
          builder: (context) => FactureScreen(
            commande: commande!,
            paymentMethod: selectedPaymentMethod!.id,
          ),
        ),
      );
    } else {
      _showErrorDialog('Le paiement a échoué. Veuillez réessayer.');
    }
  } catch (e) {
    _showErrorDialog('Erreur lors du traitement du paiement: $e');
  } finally {
    if (mounted) {
      setState(() => isProcessingPayment = false);
    }
  }
}


  void _showErrorDialog(String message) {
    showDialog(
      context: context,
      builder:
          (context) => AlertDialog(
            title: const Text('Erreur'),
            content: Text(message),
            actions: [
              TextButton(
                onPressed: () => Navigator.of(context).pop(),
                child: const Text('OK'),
              ),
            ],
          ),
    );
  }

  void _showSuccessDialog() {
    showDialog(
      context: context,
      barrierDismissible: false,
      builder:
          (context) => AlertDialog(
            title: const Row(
              children: [
                Icon(Icons.check_circle, color: Color(0xFF28A745), size: 28),
                SizedBox(width: 12),
                Text('Paiement réussi'),
              ],
            ),
            content: Text(
              'Le paiement de ${NumberFormat("#,##0.00", "fr_FR").format(commande!.totalTtc)} MGA a été traité avec succès via ${selectedPaymentMethod!.name}.',
            ),
            actions: [
              TextButton(
                onPressed: () {
                  Navigator.of(context).pop(); // Fermer le dialog
                  Navigator.of(
                    context,
                  ).pop(true); // Retourner à la page précédente avec succès
                },
                child: const Text('Fermer'),
              ),
            ],
          ),
    );
  }

  Widget _buildCommandeHeader() {
    if (commande == null) return const SizedBox.shrink();

    return Container(
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        color: Colors.grey[50],
        borderRadius: BorderRadius.circular(12),
        border: Border.all(color: Colors.grey[200]!),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Text(
                'Commande #${commande!.numeroCommande}',
                style: const TextStyle(
                  fontSize: 18,
                  fontWeight: FontWeight.bold,
                  color: Colors.black87,
                ),
              ),
              Container(
                padding: const EdgeInsets.symmetric(
                  horizontal: 12,
                  vertical: 6,
                ),
                decoration: BoxDecoration(
                  color: Colors.blue[50],
                  borderRadius: BorderRadius.circular(20),
                  border: Border.all(color: Colors.blue[200]!),
                ),
                child: Text(
                  'Table ${widget.tableNumber}',
                  style: TextStyle(
                    color: Colors.blue[700],
                    fontSize: 12,
                    fontWeight: FontWeight.w600,
                  ),
                ),
              ),
            ],
          ),

          const SizedBox(height: 16),

          _buildCommandeItems(),

          const SizedBox(height: 16),

          const Divider(),

          const SizedBox(height: 8),

          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              const Text(
                'Total:',
                style: TextStyle(
                  fontSize: 16,
                  fontWeight: FontWeight.bold,
                  color: Colors.black87,
                ),
              ),
              Text(
                '${NumberFormat("#,##0.00", "fr_FR").format(commande!.totalTtc)} MGA',
                style: const TextStyle(
                  fontSize: 18,
                  fontWeight: FontWeight.bold,
                  color: Color(0xFF28A745),
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget _buildCommandeItems() {
    if (commande?.items.isEmpty ?? true) {
      return const Text('Aucun article');
    }

    return Column(
      children:
          commande!.items.map((item) {
            return Padding(
              padding: const EdgeInsets.symmetric(vertical: 4),
              child: Row(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Expanded(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(
                          '${item.quantite}× ${item.menuNom}',
                          style: const TextStyle(
                            fontSize: 14,
                            fontWeight: FontWeight.w500,
                          ),
                        ),
                        if (item.menuDescription != null &&
                            item.menuDescription!.isNotEmpty)
                          Padding(
                            padding: const EdgeInsets.only(top: 2),
                            child: Text(
                              item.menuDescription!,
                              style: TextStyle(
                                fontSize: 12,
                                color: Colors.grey[600],
                              ),
                              maxLines: 2,
                              overflow: TextOverflow.ellipsis,
                            ),
                          ),
                        if (item.hasComments)
                          Padding(
                            padding: const EdgeInsets.only(top: 2),
                            child: Text(
                              'Note: ${item.commentaires}',
                              style: TextStyle(
                                fontSize: 12,
                                color: Colors.orange[700],
                                fontStyle: FontStyle.italic,
                              ),
                            ),
                          ),
                      ],
                    ),
                  ),
                  const SizedBox(width: 12),
                  Text(
                    '${NumberFormat("#,##0.00", "fr_FR").format(item.totalItem)} MGA',
                    style: const TextStyle(
                      fontSize: 14,
                      fontWeight: FontWeight.w600,
                    ),
                  ),
                ],
              ),
            );
          }).toList(),
    );
  }

  Widget _buildPaymentMethods() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          'Méthode de paiement',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
            color: Colors.black87,
          ),
        ),

        const SizedBox(height: 16),

        ...paymentMethods.map((method) => _buildPaymentMethodCard(method)),
      ],
    );
  }

  Widget _buildPaymentMethodCard(PaymentMethod method) {
    final isSelected = selectedPaymentMethod?.id == method.id;
    final amount = commande?.totalTtc ?? 0.0;

    return Container(
      margin: const EdgeInsets.only(bottom: 12),
      child: Material(
        color: Colors.transparent,
        child: InkWell(
          onTap: () {
            setState(() {
              selectedPaymentMethod = method;
            });
          },
          borderRadius: BorderRadius.circular(12),
          child: Container(
            padding: const EdgeInsets.all(20),
            decoration: BoxDecoration(
              color: method.color,
              borderRadius: BorderRadius.circular(12),
              border:
                  isSelected ? Border.all(color: Colors.white, width: 3) : null,
              boxShadow: [
                BoxShadow(
                  color: Colors.black.withOpacity(0.1),
                  blurRadius: 8,
                  offset: const Offset(0, 2),
                ),
              ],
            ),
            child: Row(
              children: [
                Container(
                  padding: const EdgeInsets.all(12),
                  decoration: BoxDecoration(
                    color: Colors.white.withOpacity(0.2),
                    borderRadius: BorderRadius.circular(8),
                  ),
                  child: Icon(method.icon, color: Colors.white, size: 24),
                ),

                const SizedBox(width: 16),

                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        method.name,
                        style: const TextStyle(
                          color: Colors.white,
                          fontSize: 16,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                      const SizedBox(height: 4),
                      Text(
                        method.description,
                        style: TextStyle(
                          color: Colors.white.withOpacity(0.9),
                          fontSize: 13,
                        ),
                      ),
                    ],
                  ),
                ),

                const SizedBox(width: 16),

                Text(
                  '${NumberFormat("#,##0.00", "fr_FR").format(amount)} MGA',
                  style: const TextStyle(
                    color: Colors.white,
                    fontSize: 18,
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildPaymentButton() {
    final canPay = selectedPaymentMethod != null && !isProcessingPayment;

    return Container(
      width: double.infinity,
      margin: const EdgeInsets.only(top: 20),
      child: ElevatedButton(
        onPressed: canPay ? _processPayment : null,
        style: ElevatedButton.styleFrom(
          backgroundColor: const Color(0xFF28A745),
          foregroundColor: Colors.white,
          padding: const EdgeInsets.symmetric(vertical: 16),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(12),
          ),
          elevation: 2,
        ),
        child:
            isProcessingPayment
                ? const Row(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    SizedBox(
                      width: 20,
                      height: 20,
                      child: CircularProgressIndicator(
                        strokeWidth: 2,
                        valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
                      ),
                    ),
                    SizedBox(width: 12),
                    Text(
                      'Traitement en cours...',
                      style: TextStyle(
                        fontSize: 16,
                        fontWeight: FontWeight.w600,
                      ),
                    ),
                  ],
                )
                : Row(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    const Icon(Icons.payment, size: 20),
                    const SizedBox(width: 8),
                    Text(
                      selectedPaymentMethod != null
                          ? 'Payer ${NumberFormat("#,##0.00", "fr_FR").format(commande?.totalTtc)} MGA'
                          : 'Sélectionnez une méthode de paiement',
                      style: const TextStyle(
                        fontSize: 16,
                        fontWeight: FontWeight.w600,
                      ),
                    ),
                  ],
                ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      appBar: AppBar(
        backgroundColor: Colors.white,
        elevation: 0,
        leading: IconButton(
          icon: const Icon(Icons.arrow_back, color: Colors.black87),
          onPressed: () => Navigator.of(context).pop(),
        ),
        title: const Text(
          'Caisse',
          style: TextStyle(
            color: Colors.black87,
            fontSize: 20,
            fontWeight: FontWeight.bold,
          ),
        ),
        centerTitle: true,
      ),

      body:
          isLoading
              ? const Center(
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    CircularProgressIndicator(
                      valueColor: AlwaysStoppedAnimation<Color>(
                        Color(0xFF28A745),
                      ),
                    ),
                    SizedBox(height: 16),
                    Text(
                      'Chargement des détails...',
                      style: TextStyle(fontSize: 14, color: Colors.grey),
                    ),
                  ],
                ),
              )
              : commande == null
              ? Center(
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    const Icon(
                      Icons.error_outline,
                      size: 64,
                      color: Colors.red,
                    ),
                    const SizedBox(height: 16),
                    const Text(
                      'Impossible de charger la commande',
                      style: TextStyle(
                        fontSize: 16,
                        fontWeight: FontWeight.w600,
                      ),
                    ),
                    const SizedBox(height: 8),
                    Text(
                      'Commande #${widget.commandeId}',
                      style: TextStyle(fontSize: 14, color: Colors.grey[600]),
                    ),
                    const SizedBox(height: 20),
                    ElevatedButton(
                      onPressed: _loadCommandeDetails,
                      child: const Text('Réessayer'),
                    ),
                  ],
                ),
              )
              : SingleChildScrollView(
                padding: const EdgeInsets.all(20),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    _buildCommandeHeader(),

                    const SizedBox(height: 32),

                    _buildPaymentMethods(),

                    _buildPaymentButton(),

                    const SizedBox(height: 20),
                  ],
                ),
              ),
    );
  }
}