import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import '../services/auth_service.dart';

class AuthProvider extends ChangeNotifier {
  final AuthService _service = AuthService();

  bool _loading = false;
  bool get loading => _loading;

  String? _token;
  Map<String, dynamic>? _user;

  String? get token => _token;
  Map<String, dynamic>? get user => _user;
  bool get isLoggedIn => _token != null && _token!.isNotEmpty;

  AuthProvider() {
    _loadFromPrefs();
  }

  Future<void> _loadFromPrefs() async {
    final prefs = await SharedPreferences.getInstance();
    _token = prefs.getString('token');
    final userJson = prefs.getString('user');
    if (userJson != null) {
      try {
        _user = Map<String, dynamic>.from(jsonDecode(userJson));
      } catch (_) {
        _user = null;
      }
    }
    notifyListeners();
  }

  Future<Map<String, dynamic>> login(String loginId, String password) async {
    _loading = true;
    notifyListeners();

    final res = await _service.login(loginId, password);

    _loading = false;

    if (res['success'] == true) {
      final token = res['token']?.toString();
      final userMap = res['user'] is Map ? Map<String, dynamic>.from(res['user']) : null;

      if (token != null && userMap != null) {
        await _saveSession(token, userMap);
      }
    }

    notifyListeners();
    return res;
  }

  Future<void> _saveSession(String token, Map<String, dynamic> userMap) async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString('token', token);
    await prefs.setString('user', jsonEncode(userMap));
    _token = token;
    _user = userMap;
  }

  Future<void> logout() async {
    // optional: call API logout if implemented
    if (_token != null) {
      try {
        await _service.logout(_token!);
      } catch (_) {}
    }

    final prefs = await SharedPreferences.getInstance();
    await prefs.remove('token');
    await prefs.remove('user');
    _token = null;
    _user = null;
    notifyListeners();
  }
}