import 'dart:io';
import 'dart:ui';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:file_picker/file_picker.dart';
import 'package:path_provider/path_provider.dart';
import 'package:qr_flutter/qr_flutter.dart';

import '../Components/appDrawer.dart';
import '../Components/app_bar.dart';
import '../Models/produit.dart';
import '../Services/productDatabase.dart';

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

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

class _AddProductPageState extends State<AddProductPage> {
  // Controllers for text fields
  final TextEditingController _nameController = TextEditingController();
  final TextEditingController _priceController = TextEditingController();
  final TextEditingController _imageController = TextEditingController();
  final TextEditingController _descriptionController = TextEditingController();

  String? _qrData; // Variable to store QR code data
  final List<String> _categories = ['Sucré', 'Salé', 'Jus', 'Gateaux']; // List of product categories
  String? _selectedCategory; // Selected category
  File? _pickedImage; // Variable to store the selected image file
  late ProductDatabase _productDatabase; // Database instance

  @override
  void initState() {
    super.initState();
    _productDatabase = ProductDatabase.instance;
    _productDatabase.initDatabase();
    _nameController.addListener(_updateQrData);
  }

  @override
  void dispose() {
    _nameController.removeListener(_updateQrData);
    _nameController.dispose();
    super.dispose();
  }

  // Function to select an image from files or drop
  void _selectImage() async {
    final action = await showDialog(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: const Text('Sélectionner une image'),
          content: const Text('Choisissez comment sélectionner une image'),
          actions: [
            TextButton(
              onPressed: () {
                Navigator.of(context).pop('pick');
              },
              child: const Text('Choisir depuis les fichiers'),
            ),
            TextButton(
              onPressed: () {
                Navigator.of(context).pop('drop');
              },
              child: const Text('Déposer une image'),
            ),
          ],
        );
      },
    );

    if (action == 'pick') {
      final result = await FilePicker.platform.pickFiles(
        type: FileType.image,
      );

      if (result != null) {
        setState(() {
          _pickedImage = File(result.files.single.path!);
          _imageController.text = _pickedImage!.path;
        });
      }
    } else if (action == 'drop') {
      // Code to handle image drop
    }
  }

  // Function to update QR data based on product name
  void _updateQrData() {
    if (_nameController.text.isNotEmpty) {
      final reference = 'PROD_PREVIEW_${_nameController.text}_${DateTime.now().millisecondsSinceEpoch}';
      setState(() {
        _qrData = 'https://tonsite.com/$reference';
      });
    }
  }

  // Function to get the database location
  Future<void> _getDatabaseLocation() async {
    final directory = await getApplicationDocumentsDirectory();
    final dbPath = directory.path;
    print('Emplacement de la base de données : $dbPath');
  }

  // Function to generate and save QR code
  Future<String> _generateAndSaveQRCode(String reference) async {
    final qrValidationResult = QrValidator.validate(
      data: 'https://tonsite.com/$reference',
      version: QrVersions.auto,
      errorCorrectionLevel: QrErrorCorrectLevel.L,
    );
    final qrCode = qrValidationResult.qrCode;
    final painter = QrPainter.withQr(
      qr: qrCode!,
      color: Colors.black,
      emptyColor: Colors.white,
      gapless: true,
    );

    final tempDir = await getApplicationDocumentsDirectory();
    final file = File('${tempDir.path}/$reference.png');
    final picData = await painter.toImageData(2048, format: ImageByteFormat.png);
    await file.writeAsBytes(picData!.buffer.asUint8List());

    return file.path;
  }

  // Function to add a product to the database
  void _addProduct() async {
    final name = _nameController.text;
    final price = double.tryParse(_priceController.text) ?? 0.0;
    final image = _imageController.text;
    final category = _selectedCategory;
    final description = _descriptionController.text;

    if (name.isNotEmpty && price > 0 && image.isNotEmpty && category != null) {
      final reference = 'PROD_${DateTime.now().millisecondsSinceEpoch}';
      final qrPath = await _generateAndSaveQRCode(reference);

      final product = Product(
        name: name,
        price: price,
        image: image,
        category: category,
        description: description,
        qrCode: qrPath,
        reference: reference,
      );

      _productDatabase.createProduct(product).then((_) {
        Get.snackbar('Succès', 'Produit ajouté avec succès');
        setState(() {
          _nameController.clear();
          _priceController.clear();
          _imageController.clear();
          _descriptionController.clear();
          _selectedCategory = null;
          _pickedImage = null;
        });
      }).catchError((error) {
        Get.snackbar('Erreur', 'Impossible d\'ajouter le produit : $error');
      });
    } else {
      Get.snackbar(
        'Saisie invalide',
        'Veuillez entrer tous les champs requis.',
      );
    }
  }

  // Function to display the selected image
  Widget _displayImage() {
    if (_pickedImage != null) {
      return ClipRRect(
        borderRadius: BorderRadius.circular(8.0),
        child: Image.file(
          _pickedImage!,
          width: 100,
          height: 100,
          fit: BoxFit.cover,
        ),
      );
    } else {
      return Stack(
        alignment: Alignment.center,
        children: [
          Container(
            width: 100,
            height: 100,
            decoration: BoxDecoration(
              color: Colors.grey[200],
              borderRadius: BorderRadius.circular(8.0),
            ),
          ),
          Icon(
            Icons.image,
            size: 48,
            color: Colors.grey[400],
          ),
          Positioned(
            bottom: 4,
            child: Text(
              'Aucune image',
              style: TextStyle(
                fontSize: 12,
                color: Colors.grey[400],
              ),
            ),
          ),
        ],
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: const CustomAppBar(title: 'Ajouter un produit'),
      drawer: CustomDrawer(),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            const Text(
              'Ajouter un produit',
              style: TextStyle(
                fontSize: 24,
                fontWeight: FontWeight.bold,
              ),
            ),
            const SizedBox(height: 16),
            TextField(
              controller: _nameController,
              decoration: const InputDecoration(
                labelText: 'Nom du produit',
                border: OutlineInputBorder(),
              ),
            ),
            const SizedBox(height: 16),
            TextField(
              controller: _priceController,
              decoration: const InputDecoration(
                labelText: 'Prix',
                border: OutlineInputBorder(),
              ),
              keyboardType: const TextInputType.numberWithOptions(decimal: true),
            ),
            const SizedBox(height: 16),
            Row(
              crossAxisAlignment: CrossAxisAlignment.end,
              children: [
                Expanded(
                  child: TextField(
                    controller: _imageController,
                    decoration: const InputDecoration(
                      labelText: 'Image',
                      border: OutlineInputBorder(),
                    ),
                  ),
                ),
                const SizedBox(width: 8),
                ElevatedButton(
                  onPressed: _selectImage,
                  child: const Text('Sélectionner une image'),
                ),
              ],
            ),
            const SizedBox(height: 16),
            _displayImage(),
            const SizedBox(height: 16),
            DropdownButtonFormField<String>(
              value: _selectedCategory,
              onChanged: (newValue) {
                setState(() {
                  _selectedCategory = newValue;
                });
              },
              decoration: const InputDecoration(
                labelText: 'Catégorie',
                border: OutlineInputBorder(),
              ),
              items: _categories.map((category) {
                return DropdownMenuItem<String>(
                  value: category,
                  child: Text(category),
                );
              }).toList(),
            ),
            const SizedBox(height: 16),
            if (_qrData != null)
              Column(
                children: [
                  const SizedBox(height: 16),
                  const Text('Aperçu du QR Code :'),
                  QrImageView(
                    data: _qrData!,
                    version: QrVersions.auto,
                    size: 120.0,
                  ),
                ],
              ),
            const SizedBox(height: 16),
            TextField(
              controller: _descriptionController,
              decoration: const InputDecoration(
                labelText: 'Description',
                border: OutlineInputBorder(),
              ),
              maxLines: 3,
            ),
            const SizedBox(height: 16),
            ElevatedButton(
              onPressed: _addProduct,
              child: const Text('Ajouter le produit'),
            ),
          ],
        ),
      ),
    );
  }
}