import 'dart:developer';

import 'package:injectable/injectable.dart';
import 'package:isar/isar.dart';
import 'package:mnemo_cards_backend/api/subscription/extension.dart';
import 'package:mnemo_cards_common_backend/mnemo_cards_common_backend.dart';
import 'package:mnemo_cards_common/mnemo_cards_common.dart';

import '../../main.dart';

@lazySingleton
class SubscriptionManager {
  Future<SubscriptionDto> getSubscriptionDto(UserModel user) async {
    await user.subscriptionModel.load();
    final subscription = user.subscriptionModel.value;
    if (subscription != null && subscription.isActive) {
      return _activeSubscriptionDto(user, subscription);
    } else {
      return _buySubscriptionDto(user);
    }
  }

  Future<SubscriptionPlanModel?> getSubscriptionPlan(String id) async {
    final intId = int.tryParse(id);
    if (intId == null) {
      log('Incorrect id: $id');
      return null;
    }
    final model = await isar.txn(() => isar.subscriptionPlanModels.get(intId));
    return model;
  }

  Future<SubscriptionDto> _activeSubscriptionDto(
    UserModel user,
    UserSubscriptionModel subscription,
  ) async {
    final days = subscription.finish.difference(DateTime.now()).abs().inDays;
    return SubscriptionDto(
      page: SubscriptionPageDto(
        title: 'Ваша подписка',
        items: [
          TextItem(
            title: '',
          ),
          TextItem(
            title:
                days > 0 ? 'Действует еще ${days} дней' : 'Закончится сегодня',
          ),
          SpacerItem(),
        ],
        plans: [],
      ),
      isActive: true,
      start: user.subscriptionModel.value?.start,
      finish: user.subscriptionModel.value?.finish,
    );
  }

  Future<SubscriptionDto> _buySubscriptionDto(UserModel user) async {
    final plans = await isar.txn(
      () => isar.subscriptionPlanModels
          .filter()
          .paymentSystemEqualTo(PaymentSystem.yookassa)
          .findAll(),
    );
    plans.sort((p, n) => p.durationDays.compareTo(n.durationDays));
    return SubscriptionDto(
      page: SubscriptionPageDto(
        title: 'Подписка',
        items: [
          SpacerItem(
            flex: 1,
            height: 10,
          ),
          TextItem(title: 'Открывает все наборы!', color: '#ff'),
          TextItem(
            title: 'Убирает всю рекламу!',
          ),
          SpacerItem(
            flex: 2,
          ),
        ],
        plans: [
          ...await Future.wait(
            plans.map(
              (plan) => plan.toDto(),
            ),
          ),
        ],
      ),
      isActive: false,
      start: null,
      finish: null,
    );
  }

  Future<List<SubscriptionPlanAdminDto>> getAllSubscriptionPlans() async {
    final models =
        await isar.txn(() => isar.subscriptionPlanModels.where().findAll());
    return Future.wait(models.map((model) => model.toAdminDto()));
  }

  Future<bool> deleteSubscriptionPlans(String id) async {
    final intId = int.parse(id);
    return isar.writeTxn(() {
      return isar.subscriptionPlanModels.delete(intId);
    });
  }

  Future<bool> addSubscriptionPlans(SubscriptionPlanAdminDto dto) async {
    final model = await int.tryParse(dto.id ?? '')
            ?.let((id) => isar.subscriptionPlanModels.get(id)) ??
        SubscriptionPlanModel(
          ui: null,
          price: dto.price,
          currency: dto.currency,
          durationDays: dto.durationDays,
          features: dto.features,
          paymentSystem: dto.paymentSystem,
          paymentId: dto.paymentId,
        );

    final updatedModel = model.copyWith(
      id: model.id,
      ui: dto.ui.toModel(),
      price: dto.price,
      currency: dto.currency,
      durationDays: dto.durationDays,
      features: dto.features,
      paymentId: dto.paymentId,
      paymentSystem: dto.paymentSystem,
    );

    await isar.writeTxn(
      () => isar.subscriptionPlanModels.put(updatedModel),
    );
    return true;
  }
}