recipe-manager/mobile/lib/core/providers.dart

import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'api/api_client.dart';
import 'models/recipe.dart';
import 'storage/secure_storage_service.dart';

final secureStorageProvider = Provider<SecureStorageService>((ref) {
  return SecureStorageService();
});

final apiClientProvider = Provider<ApiClient>((ref) {
  final storage = ref.watch(secureStorageProvider);
  return ApiClient(storage);
});

// Authentication State Notifier
class AuthState {
  final bool isAuthenticated;
  final bool isLoading;
  final String? errorMessage;
  final Map<String, dynamic>? user;

  const AuthState({
    required this.isAuthenticated,
    this.isLoading = false,
    this.errorMessage,
    this.user,
  });

  factory AuthState.initial() => const AuthState(isAuthenticated: false);
  factory AuthState.loading() => const AuthState(isAuthenticated: false, isLoading: true);
  factory AuthState.authenticated(Map<String, dynamic> user) =>
      AuthState(isAuthenticated: true, user: user);
  factory AuthState.unauthenticated([String? error]) =>
      AuthState(isAuthenticated: false, errorMessage: error);
}

class AuthNotifier extends StateNotifier<AuthState> {
  final ApiClient _api;
  final SecureStorageService _storage;

  AuthNotifier(this._api, this._storage) : super(AuthState.initial()) {
    checkInitialAuth();
  }

  Future<void> checkInitialAuth() async {
    final isValid = await _storage.hasValidSession();
    if (isValid) {
      final user = await _storage.getUser();
      state = AuthState.authenticated(user ?? {'username': 'Chef'});
    } else {
      state = AuthState.unauthenticated();
    }
  }

  Future<bool> login({
    required String serverUrl,
    required String username,
    required String password,
    required String deviceName,
  }) async {
    state = AuthState.loading();
    try {
      final res = await _api.login(
        serverUrl: serverUrl,
        username: username,
        password: password,
        deviceName: deviceName,
      );
      final user = res['user'] as Map<String, dynamic>;
      state = AuthState.authenticated(user);
      return true;
    } catch (e) {
      state = AuthState.unauthenticated(e.toString());
      return false;
    }
  }

  Future<void> logout() async {
    await _api.logout();
    state = AuthState.unauthenticated();
  }
}

final authProvider = StateNotifierProvider<AuthNotifier, AuthState>((ref) {
  final api = ref.watch(apiClientProvider);
  final storage = ref.watch(secureStorageProvider);
  return AuthNotifier(api, storage);
});

// Recipe List State Notifier
class RecipeListNotifier extends StateNotifier<AsyncValue<List<Recipe>>> {
  final ApiClient _api;

  RecipeListNotifier(this._api) : super(const AsyncValue.loading()) {
    loadRecipes();
  }

  Future<void> loadRecipes() async {
    state = const AsyncValue.loading();
    try {
      final recipes = await _api.fetchRecipes();
      state = AsyncValue.data(recipes);
    } catch (e, st) {
      state = AsyncValue.error(e, st);
    }
  }

  Future<void> addOrUpdate(Recipe recipe) async {
    try {
      final saved = await _api.saveRecipe(recipe);
      final current = state.value ?? [];
      final idx = current.indexWhere((r) => r.id == saved.id);
      if (idx >= 0) {
        current[idx] = saved;
        state = AsyncValue.data([...current]);
      } else {
        state = AsyncValue.data([saved, ...current]);
      }
    } catch (e) {
      rethrow;
    }
  }

  Future<void> remove(String id) async {
    await _api.deleteRecipe(id);
    final current = state.value ?? [];
    state = AsyncValue.data(current.where((r) => r.id != id).toList());
  }
}

final recipeListProvider =
    StateNotifierProvider<RecipeListNotifier, AsyncValue<List<Recipe>>>((ref) {
  final api = ref.watch(apiClientProvider);
  return RecipeListNotifier(api);
});