import '../../core/api/api_client.dart';
import '../../shared/models/diary_entry.dart';
import '../../shared/models/menu.dart';
import '../../shared/models/shopping_item.dart';

class MenuService {
  final ApiClient _client;

  MenuService(this._client);

  // ── Menu ──────────────────────────────────────────────────

  Future<MenuPlan?> getMenu({String? week}) async {
    final params = <String, dynamic>{};
    if (week != null) params['week'] = week;
    final data = await _client.get('/menu', params: params);
    // Backend returns {"week_start": "...", "days": null} when no plan exists.
    if (data['id'] == null) return null;
    return MenuPlan.fromJson(data);
  }

  Future<MenuPlan> generateMenu({String? week}) async {
    final body = <String, dynamic>{};
    if (week != null) body['week'] = week;
    final data = await _client.post('/ai/generate-menu', data: body);
    return MenuPlan.fromJson(data);
  }

  /// Generates meals for specific [dates] (YYYY-MM-DD) and [mealTypes].
  /// Returns the updated MenuPlan for each affected week.
  Future<List<MenuPlan>> generateForDates({
    required List<String> dates,
    required List<String> mealTypes,
  }) async {
    final data = await _client.post('/ai/generate-menu', data: {
      'dates': dates,
      'meal_types': mealTypes,
    });
    final plans = data['plans'] as List<dynamic>;
    return plans
        .map((planJson) => MenuPlan.fromJson(planJson as Map<String, dynamic>))
        .toList();
  }

  Future<void> updateMenuItem(String itemId, String recipeId) async {
    await _client.put('/menu/items/$itemId', data: {'recipe_id': recipeId});
  }

  Future<void> deleteMenuItem(String itemId) async {
    await _client.deleteVoid('/menu/items/$itemId');
  }

  // ── Shopping list ─────────────────────────────────────────

  Future<List<ShoppingItem>> getShoppingList({String? week}) async {
    final params = <String, dynamic>{};
    if (week != null) params['week'] = week;
    final data = await _client.getList('/shopping-list', params: params);
    return data
        .map((e) => ShoppingItem.fromJson(e as Map<String, dynamic>))
        .toList();
  }

  Future<List<ShoppingItem>> generateShoppingList({String? week}) async {
    final body = <String, dynamic>{};
    if (week != null) body['week'] = week;
    final data = await _client.postList('/shopping-list/generate', data: body);
    return data
        .map((e) => ShoppingItem.fromJson(e as Map<String, dynamic>))
        .toList();
  }

  Future<void> toggleShoppingItem(int index, bool checked,
      {String? week}) async {
    final params = <String, dynamic>{};
    if (week != null) params['week'] = week;
    await _client.patch(
      '/shopping-list/items/$index/check',
      data: {'checked': checked},
      params: params,
    );
  }

  // ── Diary ─────────────────────────────────────────────────

  Future<List<DiaryEntry>> getDiary(String date) async {
    final data = await _client.getList('/diary', params: {'date': date});
    return data
        .map((e) => DiaryEntry.fromJson(e as Map<String, dynamic>))
        .toList();
  }

  Future<DiaryEntry> createDiaryEntry(Map<String, dynamic> body) async {
    final data = await _client.post('/diary', data: body);
    return DiaryEntry.fromJson(data);
  }

  Future<void> deleteDiaryEntry(String id) async {
    await _client.deleteVoid('/diary/$id');
  }
}