import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'dart:io';
import 'dart:convert';

class PrinterPage extends StatefulWidget {
  const PrinterPage({super.key});

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

class _PrinterPageState extends State<PrinterPage> {
  static const String printerIP = '192.168.123.251';
  static const int printerPort = 9100;

  bool _isPrinting = false;
  bool _isConnected = false;
  bool _isTestingConnection = false;
  String _statusMessage = 'Non testé';

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

  Future<void> _testConnection() async {
    setState(() {
      _isTestingConnection = true;
      _statusMessage = 'Test en cours...';
    });

    try {
      final socket = await Socket.connect(
        printerIP,
        printerPort,
      ).timeout(const Duration(seconds: 5));
      await socket.close();

      setState(() {
        _isConnected = true;
        _statusMessage = 'Connectée';
        _isTestingConnection = false;
      });
    } catch (e) {
      setState(() {
        _isConnected = false;
        _statusMessage = 'Erreur: $e';
        _isTestingConnection = false;
      });
    }
  }

  Future<bool> _printReceipt() async {
    try {
      final socket = await Socket.connect(printerIP, printerPort);
      final List<int> bytes = [];

      // Initialisation ESC/POS
      bytes.addAll([0x1B, 0x40]); // ESC @

      // Titre centré et agrandi
      bytes.addAll([0x1B, 0x61, 0x01]); // Centre
      bytes.addAll([0x1D, 0x21, 0x11]); // Taille double
      bytes.addAll(utf8.encode('REÇU DE VENTE'));
      bytes.addAll([0x0A, 0x0A]);

      // Retour taille normale
      bytes.addAll([0x1D, 0x21, 0x00]);
      bytes.addAll([0x1B, 0x61, 0x00]); // Alignement gauche

      // Informations transaction
      final now = DateTime.now();
      final dateStr =
          '${now.day.toString().padLeft(2, '0')}/${now.month.toString().padLeft(2, '0')}/${now.year} ${now.hour.toString().padLeft(2, '0')}:${now.minute.toString().padLeft(2, '0')}';

      bytes.addAll(utf8.encode('Date: $dateStr\n'));
      bytes.addAll(utf8.encode('Caissier: Admin\n'));
      bytes.addAll(utf8.encode('--------------------------------\n'));

      // En-têtes colonnes
      bytes.addAll(utf8.encode('Article          Qte    Prix\n'));
      bytes.addAll(utf8.encode('--------------------------------\n'));

      // Articles
      bytes.addAll(utf8.encode('Produit 1         2    25.00€\n'));
      bytes.addAll(utf8.encode('Produit 2         1    15.50€\n'));
      bytes.addAll(utf8.encode('--------------------------------\n'));

      // Total
      bytes.addAll([0x1B, 0x45, 0x01]); // Gras ON
      bytes.addAll(utf8.encode('TOTAL                  40.50€\n'));
      bytes.addAll([0x1B, 0x45, 0x00]); // Gras OFF

      bytes.addAll([0x0A, 0x0A]);

      // Message de remerciement centré
      bytes.addAll([0x1B, 0x61, 0x01]); // Centre
      bytes.addAll(utf8.encode('Merci de votre visite !\n'));
      bytes.addAll([0x0A, 0x0A]);

      // Coupe papier
      bytes.addAll([0x1D, 0x56, 0x00]); // GS V 0

      // Envoi des données
      socket.add(bytes);
      await socket.flush();
      await socket.close();

      return true;
    } catch (e) {
      if (kDebugMode) {
        print('Erreur impression: $e');
      }
      return false;
    }
  }

  Future<void> _handlePrint() async {
    setState(() => _isPrinting = true);

    final success = await _printReceipt();

    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(
          success ? 'Impression réussie!' : 'Échec de l\'impression',
        ),
        backgroundColor: success ? Colors.green : Colors.red,
        duration: const Duration(seconds: 3),
      ),
    );

    setState(() => _isPrinting = false);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Imprimante POS'),
        backgroundColor: Colors.blue,
        foregroundColor: Colors.white,
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            // Status de connexion
            Card(
              child: Padding(
                padding: const EdgeInsets.all(16.0),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      'Status de l\'imprimante',
                      style: Theme.of(context).textTheme.titleLarge,
                    ),
                    const SizedBox(height: 10),
                    Row(
                      children: [
                        if (_isTestingConnection)
                          const SizedBox(
                            width: 20,
                            height: 20,
                            child: CircularProgressIndicator(strokeWidth: 2),
                          )
                        else
                          Icon(
                            _isConnected ? Icons.wifi : Icons.wifi_off,
                            color: _isConnected ? Colors.green : Colors.red,
                            size: 20,
                          ),
                        const SizedBox(width: 10),
                        Expanded(
                          child: Text(
                            'IP: $printerIP:$printerPort\nStatus: $_statusMessage',
                            style: const TextStyle(fontSize: 14),
                          ),
                        ),
                      ],
                    ),
                    const SizedBox(height: 10),
                    ElevatedButton.icon(
                      onPressed: _isTestingConnection ? null : _testConnection,
                      icon: const Icon(Icons.refresh),
                      label: const Text('Tester la connexion'),
                    ),
                  ],
                ),
              ),
            ),

            const SizedBox(height: 20),

            // Aperçu du reçu
            Card(
              child: Padding(
                padding: const EdgeInsets.all(16.0),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      'Aperçu du reçu',
                      style: Theme.of(context).textTheme.titleLarge,
                    ),
                    const SizedBox(height: 10),
                    Container(
                      padding: const EdgeInsets.all(12),
                      decoration: BoxDecoration(
                        border: Border.all(color: Colors.grey),
                        borderRadius: BorderRadius.circular(4),
                        color: Colors.grey[50],
                      ),
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.center,
                        children: [
                          const Text(
                            'REÇU DE VENTE',
                            style: TextStyle(
                              fontSize: 18,
                              fontWeight: FontWeight.bold,
                            ),
                          ),
                          const SizedBox(height: 10),
                          Align(
                            alignment: Alignment.centerLeft,
                            child: Column(
                              crossAxisAlignment: CrossAxisAlignment.start,
                              children: [
                                Text(
                                  'Date: ${DateTime.now().toString().substring(0, 16)}',
                                ),
                                const Text('Caissier: Admin'),
                                const Text('--------------------------------'),
                                const Text('Article          Qte    Prix'),
                                const Text('--------------------------------'),
                                const Text('Produit 1         2    25.00€'),
                                const Text('Produit 2         1    15.50€'),
                                const Text('--------------------------------'),
                                const Text(
                                  'TOTAL                  40.50€',
                                  style: TextStyle(fontWeight: FontWeight.bold),
                                ),
                              ],
                            ),
                          ),
                          const SizedBox(height: 10),
                          const Text('Merci de votre visite !'),
                        ],
                      ),
                    ),
                  ],
                ),
              ),
            ),

            const SizedBox(height: 20),

            // Bouton d'impression
            ElevatedButton.icon(
              onPressed:
                  (_isConnected && !_isPrinting && !_isTestingConnection)
                      ? _handlePrint
                      : null,
              icon:
                  _isPrinting
                      ? const SizedBox(
                        width: 20,
                        height: 20,
                        child: CircularProgressIndicator(
                          strokeWidth: 2,
                          valueColor: AlwaysStoppedAnimation<Color>(
                            Colors.white,
                          ),
                        ),
                      )
                      : const Icon(Icons.print),
              label: Text(_isPrinting ? 'Impression...' : 'Imprimer le reçu'),
              style: ElevatedButton.styleFrom(
                backgroundColor: Colors.green,
                foregroundColor: Colors.white,
                padding: const EdgeInsets.symmetric(vertical: 15),
                textStyle: const TextStyle(fontSize: 16),
              ),
            ),

            if (!_isConnected && !_isTestingConnection)
              const Padding(
                padding: EdgeInsets.only(top: 10),
                child: Text(
                  'Vérifiez que l\'imprimante est allumée et connectée au réseau',
                  style: TextStyle(color: Colors.orange, fontSize: 12),
                  textAlign: TextAlign.center,
                ),
              ),
          ],
        ),
      ),
    );
  }
}