import 'package:dio/dio.dart';
import 'package:fintracker_api/fintracker_api.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../../core/api/api_client.dart';
import '../../core/auth/auth_controller.dart';
import '../portfolio/providers.dart' show scopesProvider;
import '../portfolios/providers.dart' show portfolioListProvider;
import '../rebalance/providers.dart' show portfoliosProvider;
import 'providers.dart';

/// Changes to accounts: one place for a single switch and for a bulk edit.
abstract class AccountActions {
  /// Applies [patch] to every account in [ids]. Returns null on success, or a message naming
  /// how many failed and why. One failure does not stop the rest: a bulk «отключить» that
  /// stalls on the 20th of 30 accounts would leave the list half changed and silent.
  Future<String?> patch(Iterable<int> ids, AccountPatch patch);
}

final accountActionsProvider = Provider<AccountActions>(
  (ref) => _ApiAccountActions(ref),
);

class _ApiAccountActions implements AccountActions {
  _ApiAccountActions(this._ref);

  final Ref _ref;

  @override
  Future<String?> patch(Iterable<int> ids, AccountPatch patch) async {
    final list = ids.toList();
    final api = _ref.read(apiProvider).getAccountsApi();
    var failed = 0;
    String? reason;
    for (final id in list) {
      try {
        await api.accountsPatch(accountId: id, accountPatch: patch);
      } on DioException catch (e) {
        failed++;
        reason ??= problemMessage(e);
      }
    }
    _ref.invalidate(accountsProvider);
    if (patch.disabled != null ||
        patch.includeInNetWorth != null ||
        patch.role != null) {
      // net worth, scopes and portfolios all follow these switches: refetch what is derived
      // from them and rebuild the metrics once, however many accounts changed
      _ref
        ..invalidate(scopesProvider)
        ..invalidate(portfolioListProvider)
        ..invalidate(portfoliosProvider);
      try {
        await _ref.read(apiProvider).getMetricsApi().metricsRefresh();
      } on DioException {
        // the next scheduled or manual refresh picks the change up
      }
    }
    return failed == 0
        ? null
        : 'Не удалось изменить $failed из ${list.length}: $reason';
  }
}