import { AbstractScheduler } from './abstract-scheduler'
import { INDEXER_COUNT, SCHEDULER_INTERVALS_MS } from '../../initializers/constants'
import { doRequest } from '../../helpers/requests'
import { logger } from '../../helpers/logger'
import { ResultList } from '../../../PeerTube/shared/models/result-list.model'
import { Video } from '../../../PeerTube/shared/models/videos/video.model'
import { indexVideos, refreshVideosIndex } from '../../helpers/elastic-search'
import { IndexableVideo } from '../../types/video.model'
import { inspect } from 'util'

export class VideosIndexer extends AbstractScheduler {

  private static instance: AbstractScheduler

  protected schedulerIntervalMs = SCHEDULER_INTERVALS_MS.videosIndexer

  private constructor () {
    super()
  }

  protected async internalExecute () {
    return this.indexVideos()
  }

  private async indexVideos () {
    const instances = [ 'peertube.cpy.re' ]

    for (const instance of instances) {
      try {
        const videos = await this.getVideos(instance)

        await indexVideos(videos)

        logger.info('Added video data from %s.', instance)
      } catch (err) {
        console.error(inspect(err, { depth: 10 }))
        logger.warn('Cannot index videos from %s.', instance, { err })
      }
    }

    await refreshVideosIndex()
  }

  private async getVideos (host: string): Promise<IndexableVideo[]> {
    const url = 'https://' + host + '/api/v1/videos'

    const res = await doRequest<ResultList<Video>>({
      uri: url,
      qs: {
        start: 0,
        filter: 'local',
        count: INDEXER_COUNT.VIDEOS
      },
      json: true
    })

    return res.body.data.map(v => Object.assign(v, { elasticSearchId: host + v.id, host }))
  }

  static get Instance () {
    return this.instance || (this.instance = new this())
  }
}