import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import '../models/user_model.dart';
import '../utils/firebase_storage_manager.dart';

class LocalUserProvider with ChangeNotifier {
  UserModel? _currentUser;
  final FirebaseAuth _auth = FirebaseAuth.instance;
  final FirebaseFirestore _firestore = FirebaseFirestore.instance;
  final FirebaseStorageManager _storageManager = FirebaseStorageManager();

  UserModel? get currentUser => _currentUser;
  String? get uid => _currentUser?.uid;
  String? get firstName => _currentUser?.firstName;
  String? get lastName => _currentUser?.lastName;
  String? get role => _currentUser?.role ?? 'USER';
  String? get profilePhotoUrl => _currentUser?.profilePhotoUrl;
  String? get email => _currentUser?.email;
  String? get phoneNumber => _currentUser?.phoneNumber;

  /// Charge les données de l'utilisateur actuel
  Future<void> loadUserData() async {
    if (_auth.currentUser == null) {
      print('No current user in Auth');
      return;
    }

    print('Loading user data for: ${_auth.currentUser!.uid}');
    try {
      DocumentSnapshot userDoc = await _firestore
          .collection('users')
          .doc(_auth.currentUser!.uid)
          .get();

      if (userDoc.exists) {
        print('User document found in Firestore');
        final userData = userDoc.data() as Map<String, dynamic>;
        print('User data: $userData');

        // Si le document n'a pas d'UID, l'ajouter
        if (!userData.containsKey('uid')) {
          await userDoc.reference.update({'uid': _auth.currentUser!.uid});
          userData['uid'] = _auth.currentUser!.uid;
        }

        setUser(UserModel.fromMap(userData, userDoc.id));
        print('User data loaded successfully');
      } else {
        print('No user document found in Firestore');
        // Créer un document utilisateur par défaut
        final defaultUser = UserModel(
          uid: _auth.currentUser!.uid,
          email: _auth.currentUser!.email ?? '',
          firstName: '',
          lastName: '',
          role: 'USER',
          phoneNumber: '',
          profilePhotoUrl: '',
        );

        await _firestore.collection('users').doc(_auth.currentUser!.uid).set({
          'uid': _auth.currentUser!.uid,
          'email': _auth.currentUser!.email,
          'firstName': '',
          'lastName': '',
          'role': 'USER',
          'phoneNumber': '',
          'profilePhotoUrl': '',
          'createdAt': FieldValue.serverTimestamp(),
        });

        setUser(defaultUser);
        print('Default user document created');
      }
    } catch (e) {
      print('Error loading user data: $e');
      rethrow;
    }
  }

  /// Met à jour l'utilisateur
  void setUser(UserModel user) {
    _currentUser = user;
    notifyListeners();
  }

  /// Efface les données utilisateur
  void clearUser() {
    _currentUser = null;
    notifyListeners();
  }

  /// Mise à jour des informations utilisateur
  Future<void> updateUserData(
      {String? firstName, String? lastName, String? phoneNumber}) async {
    if (_currentUser == null) return;
    try {
      await _firestore.collection('users').doc(_currentUser!.uid).set({
        'firstName': firstName ?? _currentUser!.firstName,
        'lastName': lastName ?? _currentUser!.lastName,
        'phone': phoneNumber ?? _currentUser!.phoneNumber,
      }, SetOptions(merge: true));

      _currentUser = _currentUser!.copyWith(
        firstName: firstName ?? _currentUser!.firstName,
        lastName: lastName ?? _currentUser!.lastName,
        phoneNumber: phoneNumber ?? _currentUser!.phoneNumber,
      );
      notifyListeners();
    } catch (e) {
      debugPrint('Erreur mise à jour utilisateur : $e');
    }
  }

  /// Changement de photo de profil
  Future<void> changeProfilePicture(XFile image) async {
    if (_currentUser == null) return;
    try {
      String? newProfilePhotoUrl = await _storageManager.sendProfilePicture(
        imageFile: image,
        uid: _currentUser!.uid,
      );
      if (newProfilePhotoUrl != null) {
        _firestore
            .collection('users')
            .doc(_currentUser!.uid)
            .update({'profilePhotoUrl': newProfilePhotoUrl});
        _currentUser =
            _currentUser!.copyWith(profilePhotoUrl: newProfilePhotoUrl);
        notifyListeners();
      }
    } catch (e) {
      debugPrint('Erreur mise à jour photo de profil : $e');
    }
  }

  /// Connexion
  Future<UserCredential> signInWithEmailAndPassword(
      String email, String password) async {
    try {
      UserCredential userCredential = await _auth.signInWithEmailAndPassword(
          email: email, password: password);
      await loadUserData();
      return userCredential;
    } catch (e) {
      throw FirebaseAuthException(code: 'login-failed', message: e.toString());
    }
  }

  /// Déconnexion
  Future<void> signOut() async {
    await _auth.signOut();
    clearUser();
  }
}