import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/foundation.dart';

class AuthService {
  final FirebaseAuth _auth = FirebaseAuth.instance;

  // Get current user
  User? get currentUser => _auth.currentUser;

  // Auth state changes stream
  Stream<User?> get authStateChanges => _auth.authStateChanges();

  // Sign in with email and password
  Future<UserCredential?> signInWithEmailAndPassword({
    required String email,
    required String password,
  }) async {
    try {
      UserCredential result = await _auth.signInWithEmailAndPassword(
        email: email,
        password: password,
      );
      return result;
    } on FirebaseAuthException catch (e) {
      if (kDebugMode) {
        print('Firebase Auth Error: ${e.message}');
      }
      throw _handleAuthException(e);
    } catch (e) {
      if (kDebugMode) {
        print('General Auth Error: $e');
      }
      throw 'Terjadi kesalahan saat login';
    }
  }

  // Register with email and password
  Future<UserCredential?> registerWithEmailAndPassword({
    required String email,
    required String password,
  }) async {
    try {
      UserCredential result = await _auth.createUserWithEmailAndPassword(
        email: email,
        password: password,
      );
      return result;
    } on FirebaseAuthException catch (e) {
      if (kDebugMode) {
        print('Firebase Auth Error: ${e.message}');
      }
      throw _handleAuthException(e);
    } catch (e) {
      if (kDebugMode) {
        print('General Auth Error: $e');
      }
      throw 'Terjadi kesalahan saat mendaftar';
    }
  }

  // Sign out
  Future<void> signOut() async {
    try {
      await _auth.signOut();
    } catch (e) {
      if (kDebugMode) {
        print('Sign out error: $e');
      }
      throw 'Terjadi kesalahan saat logout';
    }
  }

  // Reset password
  Future<void> sendPasswordResetEmail({required String email}) async {
    try {
      await _auth.sendPasswordResetEmail(email: email);
    } on FirebaseAuthException catch (e) {
      if (kDebugMode) {
        print('Password reset error: ${e.message}');
      }
      throw _handleAuthException(e);
    } catch (e) {
      if (kDebugMode) {
        print('General password reset error: $e');
      }
      throw 'Terjadi kesalahan saat mengirim email reset password';
    }
  }

  // Update user profile
  Future<void> updateUserProfile({
    String? displayName,
    String? photoURL,
  }) async {
    try {
      await currentUser?.updateDisplayName(displayName);
      if (photoURL != null) {
        await currentUser?.updatePhotoURL(photoURL);
      }
    } catch (e) {
      if (kDebugMode) {
        print('Update profile error: $e');
      }
      throw 'Terjadi kesalahan saat update profil';
    }
  }

  // Handle Firebase Auth exceptions
  String _handleAuthException(FirebaseAuthException e) {
    switch (e.code) {
      case 'weak-password':
        return 'Password terlalu lemah';
      case 'email-already-in-use':
        return 'Email sudah digunakan';
      case 'invalid-email':
        return 'Email tidak valid';
      case 'user-not-found':
        return 'User tidak ditemukan';
      case 'wrong-password':
        return 'Password salah';
      case 'user-disabled':
        return 'Akun telah dinonaktifkan';
      case 'too-many-requests':
        return 'Terlalu banyak percobaan login. Coba lagi nanti';
      case 'operation-not-allowed':
        return 'Operasi tidak diizinkan';
      case 'invalid-credential':
        return 'Kredensial tidak valid';
      case 'network-request-failed':
        return 'Koneksi internet bermasalah';
      default:
        return e.message ?? 'Terjadi kesalahan yang tidak diketahui';
    }
  }
}