import type { RegisterServerOptions } from '@peertube/peertube-types'
import { migrateSettings } from './lib/migration/settings'
import { initSettings } from './lib/settings'
import { initCustomFields } from './lib/custom-fields'
import { initRouters } from './lib/routers/index'
import { initFederation } from './lib/federation/init'
import { initChannelConfiguration } from './lib/configuration/channel/init'
import { initRSS } from './lib/rss/init'
import { prepareProsody, ensureProsodyRunning, ensureProsodyNotRunning } from './lib/prosody/ctl'
import { unloadDebugMode } from './lib/debug'
import { loadLoc } from './lib/loc'
import { RoomChannel } from './lib/room-channel'
import { BotConfiguration } from './lib/configuration/bot'
import decache from 'decache'

// FIXME: Peertube unregister don't have any parameter.
// Using this global variable to fix this, so we can use helpers to unregister.
let OPTIONS: RegisterServerOptions | undefined

async function register (options: RegisterServerOptions): Promise<any> {
  OPTIONS = options
  const logger = options.peertubeHelpers.logger

  // This is a trick to check that peertube is at least in version 3.2.0
  if (!options.peertubeHelpers.plugin) {
    throw new Error('Your peertube version is not correct. This plugin is not compatible with Peertube < 3.2.0.')
  }

  // First: load languages files, so we can localize strings.
  await loadLoc()
  // Then load the BotConfiguration singleton
  await BotConfiguration.initSingleton(options)
  // Then load the RoomChannel singleton
  const roomChannelSingleton = await RoomChannel.initSingleton(options)
  // roomChannelNeedsDataInit: if true, means that the data file does not exist (or is invalid), so we must initiate it
  const roomChannelNeedsDataInit = !await roomChannelSingleton.readData()

  await migrateSettings(options)

  await initSettings(options)
  await initCustomFields(options)
  await initRouters(options)
  await initFederation(options)
  await initChannelConfiguration(options)
  await initRSS(options)

  try {
    await prepareProsody(options)
    await ensureProsodyRunning(options)

    if (roomChannelNeedsDataInit) {
      logger.info('The RoomChannel singleton has not found any data, we must rebuild')
      // no need to wait here, can be done without await.
      roomChannelSingleton.rebuildData().then(
        () => { logger.info('RoomChannel singleton rebuild done') },
        (reason) => { logger.error('RoomChannel singleton rebuild failed: ' + (reason as string)) }
      )
    }
  } catch (error) {
    options.peertubeHelpers.logger.error('Error when launching Prosody: ' + (error as string))
  }
}

async function unregister (): Promise<any> {
  if (OPTIONS) {
    try {
      await ensureProsodyNotRunning(OPTIONS)
    } catch (error) {
      OPTIONS.peertubeHelpers.logger.error('Error when trying to unload Prosody: ' + (error as string))
    }
  }

  unloadDebugMode()

  await RoomChannel.destroySingleton()
  await BotConfiguration.destroySingleton()

  const module = __filename
  OPTIONS?.peertubeHelpers.logger.info(`Unloading module ${module}...`)
  // Peertube calls decache(plugin) on register, not unregister.
  // Will do here, to release memory.
  decache(module)
  OPTIONS?.peertubeHelpers.logger.info(`Successfully unloaded the module ${module}`)
  OPTIONS = undefined
}

module.exports = {
  register,
  unregister
}