import { Injectable } from '@nestjs/common';
import { DatabaseListen } from '../../constants';
import { EventBus } from '@nestjs/cqrs';
import { ChangeDocEvent } from '../../domain/events/change-doc.event';

@Injectable()
export class CouchService {
  constructor(private eventBus: EventBus) {}

  async onModuleInit() {
    const nano = require('nano')('http://root:password@172.10.10.2:5970');
    for (const database of DatabaseListen) {
      const db = nano.db.use(database);
      db.changesReader.start({ includeDocs: true }).on('change', (change) => {
        this.changeDoc(change, database);
      });

      console.log(`start listen database ${database}`);
    }
  }

  private changeDoc(data, database) {
    this.eventBus.publish(
      new ChangeDocEvent({
        id: data.id,
        database: database,
        data: data.doc,
      }),
    );
  }

  public async createDoc(data, database) {
    try {
      const nano = require('nano')('http://root:password@172.10.10.2:5970');
      const db = nano.use(database);
      return await db.insert(data);
    } catch (error) {}
  }

  public async deleteDoc(data, database) {
    try {
      const nano = require('nano')('http://root:password@172.10.10.2:5970');
      const db = nano.use(database);
      const result = await db.get(data.id);
      await db.destroy(data.id, result._rev);
    } catch (error) {}
  }

  public async updateDoc(data, database) {
    try {
      const nano = require('nano')('http://root:password@172.10.10.2:5970');
      const db = nano.use(database);
      const result = await db.get(data.id);
      console.log(result, 'dsa');
      await db.insert({
        ...data,
        _rev: result._rev,
      });
    } catch (error) {}
  }
}