import 'package:rxdart/subjects.dart';
import 'package:tunas/repositories/json/json_repository.dart';
import 'package:tunas/repositories/metadata/models/budget.dart';
import 'package:tunas/repositories/metadata/models/category.dart';
import 'package:tunas/repositories/metadata/models/account.dart';
import 'package:tunas/repositories/metadata/models/metadata.dart';

class MetadataRepository {

  final JsonRepository _jsonRepository;
  final _categoriesController = BehaviorSubject<List<Category>>.seeded(const []);
  final _budgetController = BehaviorSubject<List<Budget>>.seeded(const []);
  final _accountController = BehaviorSubject<List<Account>>.seeded(const []);

  MetadataRepository({
    required jsonRepository,
  }) : _jsonRepository = jsonRepository;

  Stream<List<Category>> getCategoriesStream() {
    return _categoriesController.asBroadcastStream();
  }

  Stream<List<Budget>> getBudgetsStream() {
    return _budgetController.asBroadcastStream();
  }

  Stream<List<Account>> getAccountsStream() {
    return _accountController.asBroadcastStream();
  }

  loadMetadata() async {
    Metadata metadata = await _jsonRepository.loadJson(Metadata(), MetadataFactory());
    _broadcastMetadata(metadata);
  }

  saveCategories(List<Category> categories) async {
    Metadata metadata = _constructMetadataFromControllers();
    metadata.categories = categories;
    await _jsonRepository.saveJson(metadata);
    _categoriesController.add(categories);
  }

  saveBudgets(List<Budget> budgets) async {
    Metadata metadata = _constructMetadataFromControllers();
    metadata.budgets = budgets;
    await _jsonRepository.saveJson(metadata);
    _budgetController.add(budgets);
  }

  saveAccounts(List<Account> accounts) async {
    Metadata metadata = _constructMetadataFromControllers();
    metadata.accounts = accounts;
    await _jsonRepository.saveJson(metadata);
    _accountController.add(accounts);
  }

  deleteMetadata() async {
    Metadata metadata = Metadata();
    await _jsonRepository.saveJson(metadata);
    _broadcastMetadata(metadata);
  }

  _broadcastMetadata(Metadata metadata) {
    _categoriesController.add(metadata.categories);
    _budgetController.add(metadata.budgets);
    _accountController.add(metadata.accounts);
  }

  Metadata _constructMetadataFromControllers() {
    return Metadata(
      categories: _categoriesController.value,
      budgets: _budgetController.value,
      accounts: _accountController.value,
    );
  }
}