import 'package:flutter/material.dart';
import 'package:youmazgestion/Models/users.dart';
import 'package:youmazgestion/Models/role.dart';
import 'package:youmazgestion/Services/stock_managementDatabase.dart';
//import '../Services/app_database.dart';

class EditUserPage extends StatefulWidget {
  final Users user;

  const EditUserPage({super.key, required this.user});

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

class _EditUserPageState extends State<EditUserPage> {
  late TextEditingController _nameController;
  late TextEditingController _lastNameController;
  late TextEditingController _emailController;
  late TextEditingController _usernameController;
  late TextEditingController _passwordController;

  List<Role> _roles = [];
  Role? _selectedRole;
  bool _isLoading = false;
  bool _isLoadingRoles = true;

  @override
  void initState() {
    super.initState();
    _nameController = TextEditingController(text: widget.user.name);
    _lastNameController = TextEditingController(text: widget.user.lastName);
    _emailController = TextEditingController(text: widget.user.email);
    _usernameController = TextEditingController(text: widget.user.username);
    _passwordController = TextEditingController();

    _loadRoles();
  }

  Future<void> _loadRoles() async {
    try {
      final roles = await AppDatabase.instance.getRoles();
      final currentRole = roles.firstWhere(
        (r) => r.id == widget.user.roleId,
        orElse: () => Role(id: widget.user.roleId, designation: widget.user.roleName ?? 'Inconnu'),
      );

      setState(() {
        _roles = roles;
        _selectedRole = currentRole;
        _isLoadingRoles = false;
      });
    } catch (e) {
      print('Erreur lors du chargement des rôles: $e');
      setState(() {
        _isLoadingRoles = false;
      });
      _showErrorDialog('Erreur', 'Impossible de charger les rôles.');
    }
  }

  @override
  void dispose() {
    _nameController.dispose();
    _lastNameController.dispose();
    _emailController.dispose();
    _usernameController.dispose();
    _passwordController.dispose();
    super.dispose();
  }

  bool _validateFields() {
    if (_nameController.text.trim().isEmpty ||
        _lastNameController.text.trim().isEmpty ||
        _emailController.text.trim().isEmpty ||
        _usernameController.text.trim().isEmpty ||
        _selectedRole == null) {
      _showErrorDialog('Champs manquants', 'Veuillez remplir tous les champs requis.');
      return false;
    }

    if (!RegExp(r'^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$')
        .hasMatch(_emailController.text.trim())) {
      _showErrorDialog('Email invalide', 'Veuillez saisir un email valide.');
      return false;
    }

    if (_passwordController.text.isNotEmpty &&
        _passwordController.text.length < 6) {
      _showErrorDialog('Mot de passe trop court', 'Minimum 6 caractères.');
      return false;
    }

    return true;
  }

  Future<void> _updateUser() async {
    if (!_validateFields() || _isLoading) return;

    setState(() {
      _isLoading = true;
    });

    try {
      final updatedUser = Users(
        id: widget.user.id,
        name: _nameController.text.trim(),
        lastName: _lastNameController.text.trim(),
        email: _emailController.text.trim(),
        username: _usernameController.text.trim(),
        password: _passwordController.text.isNotEmpty
            ? _passwordController.text
            : widget.user.password,
        roleId: _selectedRole!.id!,
        roleName: _selectedRole!.designation,
      );

      await AppDatabase.instance.updateUser(updatedUser);
      if (mounted) _showSuccessDialog();
    } catch (e) {
      print('Erreur de mise à jour: $e');
      if (mounted) {
        _showErrorDialog('Échec', 'Une erreur est survenue lors de la mise à jour.');
      }
    } finally {
      if (mounted) {
        setState(() {
          _isLoading = false;
        });
      }
    }
  }

  void _showSuccessDialog() {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('Mise à jour réussie'),
        content: const Text('Les informations de l\'utilisateur ont été mises à jour.'),
        actions: [
          ElevatedButton(
            onPressed: () => Navigator.of(context).pop(),
            child: const Text('OK'),
          )
        ],
      ),
    );
  }

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Modifier Utilisateur', style: TextStyle(color: Colors.white)),
        backgroundColor: const Color.fromARGB(255, 4, 54, 95),
        iconTheme: const IconThemeData(color: Colors.white),
        centerTitle: true,
      ),
      body: _isLoadingRoles
          ? const Center(child: CircularProgressIndicator())
          : SingleChildScrollView(
              padding: const EdgeInsets.all(16.0),
              child: Card(
                elevation: 4,
                child: Padding(
                  padding: const EdgeInsets.all(16.0),
                  child: Column(
                    children: [
                      const Icon(Icons.edit, size: 64, color: Colors.blue),
                      const SizedBox(height: 16),
                      _buildTextField(_nameController, 'Prénom', Icons.person),
                      const SizedBox(height: 12),
                      _buildTextField(_lastNameController, 'Nom', Icons.person_outline),
                      const SizedBox(height: 12),
                      _buildTextField(_emailController, 'Email', Icons.email, keyboardType: TextInputType.emailAddress),
                      const SizedBox(height: 12),
                      _buildTextField(_usernameController, 'Nom d\'utilisateur', Icons.account_circle),
                      const SizedBox(height: 12),
                      _buildTextField(
                        _passwordController,
                        'Mot de passe (laisser vide si inchangé)',
                        Icons.lock,
                        obscureText: true,
                      ),
                      const SizedBox(height: 12),
                      _buildDropdown(),
                      const SizedBox(height: 20),
                      SizedBox(
                        width: double.infinity,
                        height: 48,
                        child: ElevatedButton(
                          onPressed: _isLoading ? null : _updateUser,
                          style: ElevatedButton.styleFrom(
                            backgroundColor: const Color(0xFF0015B7),
                            shape: RoundedRectangleBorder(
                              borderRadius: BorderRadius.circular(8),
                            ),
                          ),
                          child: _isLoading
                              ? const CircularProgressIndicator(color: Colors.white)
                              : const Text('Mettre à jour', style: TextStyle(color: Colors.white, fontSize: 16)),
                        ),
                      )
                    ],
                  ),
                ),
              ),
            ),
    );
  }

  Widget _buildTextField(
    TextEditingController controller,
    String label,
    IconData icon, {
    TextInputType keyboardType = TextInputType.text,
    bool obscureText = false,
  }) {
    return TextField(
      controller: controller,
      decoration: InputDecoration(
        labelText: label,
        prefixIcon: Icon(icon),
        border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
      ),
      keyboardType: keyboardType,
      obscureText: obscureText,
    );
  }

  Widget _buildDropdown() {
    return Container(
      width: double.infinity,
      padding: const EdgeInsets.symmetric(horizontal: 12),
      decoration: BoxDecoration(
        border: Border.all(color: Colors.grey),
        borderRadius: BorderRadius.circular(8),
      ),
      child: DropdownButtonHideUnderline(
        child: DropdownButton<Role>(
          value: _selectedRole,
          isExpanded: true,
          hint: const Text('Sélectionner un rôle'),
          onChanged: _isLoading
              ? null
              : (Role? newValue) {
                  setState(() {
                    _selectedRole = newValue;
                  });
                },
          items: _roles.map((role) {
            return DropdownMenuItem<Role>(
              value: role,
              child: Row(
                children: [
                  const Icon(Icons.badge, size: 20),
                  const SizedBox(width: 8),
                  Text(role.designation),
                ],
              ),
            );
          }).toList(),
        ),
      ),
    );
  }
}