import { Injectable } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { NotificationsRepository } from '@task-stream/api/tracker/application';
import {
  NotificationReadModel,
  NotificationSettingsReadModel,
} from '@task-stream/api/tracker/domain';
import { Model } from 'mongoose';
import {
  fromDoc,
  NotificationDoc,
  NotificationSettingsDoc,
  ReadModels,
} from './read-model.schemas';

@Injectable()
export class MongoNotificationsRepository extends NotificationsRepository {
  constructor(
    @InjectModel(ReadModels.Notification)
    private readonly notifications: Model<NotificationDoc>,
    @InjectModel(ReadModels.NotificationSettings)
    private readonly settingsDocs: Model<NotificationSettingsDoc>,
  ) {
    super();
  }

  async insert({ id, ...rest }: NotificationReadModel): Promise<boolean> {
    const result = await this.notifications.updateOne(
      { id },
      { $setOnInsert: rest },
      { upsert: true },
    );
    return result.upsertedCount > 0;
  }

  async findForUser(
    userId: string,
    options: { unreadOnly: boolean; limit: number },
  ): Promise<NotificationReadModel[]> {
    const docs = await this.notifications
      .find({ userId, ...(options.unreadOnly ? { readAt: null } : {}) })
      .sort({ createdAt: -1 })
      .limit(options.limit)
      .lean<NotificationDoc[]>();
    return docs.map((doc) => fromDoc(doc) as NotificationReadModel);
  }

  countUnread(userId: string): Promise<number> {
    return this.notifications.countDocuments({ userId, readAt: null });
  }

  async markRead(userId: string, ids: string[] | null): Promise<void> {
    await this.notifications.updateMany(
      { userId, readAt: null, ...(ids ? { id: { $in: ids } } : {}) },
      { $set: { readAt: new Date().toISOString() } },
    );
  }

  async settings(userId: string): Promise<NotificationSettingsReadModel> {
    const doc = await this.settingsDocs
      .findOne({ id: userId })
      .lean<NotificationSettingsDoc>();
    return { userId, email: doc?.email ?? false };
  }

  async saveSettings(settings: NotificationSettingsReadModel): Promise<void> {
    await this.settingsDocs.updateOne(
      { id: settings.userId },
      { $set: { email: settings.email } },
      { upsert: true },
    );
  }
}