import { isProdInstance, isTestOrDevInstance } from '@peertube/peertube-node-utils'
import { logger, loggerTagsFactory } from '../../helpers/logger.js'
import { ACTOR_FOLLOW_SCORE, SCHEDULER_INTERVALS_MS } from '../../initializers/constants.js'
import { ActorFollowModel } from '../../models/actor/actor-follow.js'
import { ActorFollowHealthCache } from '../actor-follow-health-cache.js'
import { AbstractScheduler } from './abstract-scheduler.js'

const lTags = loggerTagsFactory('schedulers')

export class ActorFollowScheduler extends AbstractScheduler {
  private static instance: AbstractScheduler

  protected schedulerIntervalMs = SCHEDULER_INTERVALS_MS.ACTOR_FOLLOW_SCORES

  private constructor () {
    super({ randomRunOnEnable: false })
  }

  protected async internalExecute () {
    // Run too often in test/dev instances
    if (isProdInstance()) {
      logger.info('Processing pending actor follow scores.', lTags())
    }

    await this.processPendingScores()

    await this.removeBadActorFollows()
  }

  private async processPendingScores () {
    const pendingScores = ActorFollowHealthCache.Instance.getPendingFollowsScore()
    const badServerIds = ActorFollowHealthCache.Instance.getBadFollowingServerIds()
    const goodServerIds = ActorFollowHealthCache.Instance.getGoodFollowingServerIds()

    ActorFollowHealthCache.Instance.clearPendingFollowsScore()
    ActorFollowHealthCache.Instance.clearBadFollowingServerIds()
    ActorFollowHealthCache.Instance.clearGoodFollowingServerIds()

    for (const inbox of Object.keys(pendingScores)) {
      await ActorFollowModel.updateScore(inbox, pendingScores[inbox])
    }

    await ActorFollowModel.updateScoreByFollowingServers(badServerIds, ACTOR_FOLLOW_SCORE.PENALTY)
    await ActorFollowModel.updateScoreByFollowingServers(goodServerIds, ACTOR_FOLLOW_SCORE.BONUS)
  }

  private async removeBadActorFollows () {
    if (!isTestOrDevInstance()) logger.info('Removing bad actor follows (scheduler).', lTags())

    try {
      await ActorFollowModel.removeBadActorFollows()
    } catch (err) {
      logger.error('Error in bad actor follows scheduler.', { err, ...lTags() })
    }
  }

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