import type { RegisterServerOptions } from '@peertube/peertube-types'
import type { Router, Request, Response, NextFunction } from 'express'
import { videoHasWebchat } from '../../../shared/lib/video'
import { asyncMiddleware } from '../middlewares/async'
import { getCheckAPIKeyMiddleware } from '../middlewares/apikey'
import { prosodyCheckUserPassword, prosodyRegisterUser, prosodyUserRegistered } from '../prosody/auth'
import { getUserNickname } from '../helpers'
import { Affiliations, getVideoAffiliations, getChannelAffiliations } from '../prosody/config/affiliations'
import { getProsodyDomain } from '../prosody/config/domain'
import { fillVideoCustomFields } from '../custom-fields'
import { getChannelInfosById } from '../database/channel'
import { ensureProsodyRunning } from '../prosody/ctl'
import { isDebugMode } from '../debug'

// See here for description: https://modules.prosody.im/mod_muc_http_defaults.html
interface RoomDefaults {
  config: {
    name: string
    description: string
    language?: string
    persistent?: boolean
    public?: boolean
    members_only?: boolean
    allow_member_invites?: boolean
    public_jids?: boolean
    // subject_from: string
    // subject: string
    changesubject?: boolean
    // historylength: number
    moderated?: boolean
    archiving?: boolean
  }
  affiliations?: Affiliations
}

async function initApiRouter (options: RegisterServerOptions): Promise<Router> {
  const { peertubeHelpers, getRouter } = options
  const router = getRouter()
  const logger = peertubeHelpers.logger

  router.get('/test', asyncMiddleware([
    getCheckAPIKeyMiddleware(options),
    async (req: Request, res: Response, _next: NextFunction) => {
      logger.info('Test api call')
      res.json({ ok: true })
    }
  ]))

  router.get('/room', asyncMiddleware([
    getCheckAPIKeyMiddleware(options),
    async (req: Request, res: Response, _next: NextFunction) => {
      const jid: string = req.query.jid as string || ''
      logger.info(`Requesting room information for room '${jid}'.`)

      const settings = await options.settingsManager.getSettings([
        'prosody-room-type'
      ])
      // Now, we have two different room type: per video or per channel.
      if (settings['prosody-room-type'] === 'channel') {
        const matches = jid.match(/^channel\.(\d+)$/)
        if (!matches || !matches[1]) {
          logger.warn(`Invalid channel room jid '${jid}'.`)
          res.sendStatus(403)
          return
        }
        const channelId = parseInt(matches[1])
        const channelInfos = await getChannelInfosById(options, channelId)
        if (!channelInfos) {
          logger.warn(`Channel ${channelId} not found`)
          res.sendStatus(403)
          return
        }

        let affiliations: Affiliations
        try {
          affiliations = await getChannelAffiliations(options, channelId)
        } catch (error) {
          logger.error(`Failed to get channel affiliations for ${channelId}:`, error)
          // affiliations: should at least be {}, so that the first user will not be moderator/admin
          affiliations = {}
        }

        const roomDefaults: RoomDefaults = {
          config: {
            name: channelInfos.displayName,
            description: ''
            // subject: channelInfos.displayName
          },
          affiliations: affiliations
        }
        res.json(roomDefaults)
      } else {
        // FIXME: @peertube/peertype-types@4.2.2: wrongly considere video as MVideoThumbnail.
        const video = await peertubeHelpers.videos.loadByIdOrUUID(jid)
        if (!video) {
          logger.warn(`Video ${jid} not found`)
          res.sendStatus(403)
          return
        }

        // Adding the custom fields and data:
        await fillVideoCustomFields(options, video)

        // check settings (chat enabled for this video?)
        const settings = await options.settingsManager.getSettings([
          'chat-per-live-video',
          'chat-all-lives',
          'chat-all-non-lives',
          'chat-videos-list'
        ])
        if (!videoHasWebchat({
          'chat-per-live-video': !!settings['chat-per-live-video'],
          'chat-all-lives': !!settings['chat-all-lives'],
          'chat-all-non-lives': !!settings['chat-all-non-lives'],
          'chat-videos-list': settings['chat-videos-list'] as string
        }, video)) {
          logger.warn(`Video ${jid} has not chat activated`)
          res.sendStatus(403)
          return
        }

        let affiliations: Affiliations
        try {
          affiliations = await getVideoAffiliations(options, video)
        } catch (error) {
          logger.error(`Failed to get video affiliations for ${video.uuid}:`, error)
          // affiliations: should at least be {}, so that the first user will not be moderator/admin
          affiliations = {}
        }

        const roomDefaults: RoomDefaults = {
          config: {
            name: video.name,
            description: '',
            language: video.language
            // subject: video.name
          },
          affiliations: affiliations
        }
        res.json(roomDefaults)
      }
    }
  ]))

  router.get('/auth', asyncMiddleware(
    async (req: Request, res: Response, _next: NextFunction) => {
      const user = await peertubeHelpers.user.getAuthUser(res)
      if (!user) {
        res.sendStatus(403)
        return
      }
      if (user.blocked) {
        res.sendStatus(403)
        return
      }
      // NB 2021-08-05: Peertube usernames should be lowercase. But it seems that
      // in some old installation, there can be uppercase letters in usernames.
      // When Peertube checks username unicity, it does a lowercase search.
      // So it feels safe to normalize usernames like so:
      const normalizedUsername = user.username.toLowerCase()
      const prosodyDomain = await getProsodyDomain(options)
      const password: string = await prosodyRegisterUser(normalizedUsername)
      const nickname: string | undefined = await getUserNickname(options, user)
      res.status(200).json({
        jid: normalizedUsername + '@' + prosodyDomain,
        password: password,
        nickname: nickname
      })
    }
  ))

  router.post('/user/register', asyncMiddleware(
    async (req: Request, res: Response, _next: NextFunction) => {
      res.sendStatus(501)
    }
  ))

  router.get('/user/check_password', asyncMiddleware(
    async (req: Request, res: Response, _next: NextFunction) => {
      const prosodyDomain = await getProsodyDomain(options)
      const user = req.query.user
      const server = req.query.server
      const pass = req.query.pass
      if (server !== prosodyDomain) {
        logger.warn(`Cannot call check_password on user on server ${server as string}.`)
        res.status(200).send('false')
        return
      }
      if (user && pass && await prosodyCheckUserPassword(user as string, pass as string)) {
        res.status(200).send('true')
        return
      }
      res.status(200).send('false')
    }
  ))

  router.get('/user/user_exists', asyncMiddleware(
    async (req: Request, res: Response, _next: NextFunction) => {
      const prosodyDomain = await getProsodyDomain(options)
      const user = req.query.user
      const server = req.query.server
      if (server !== prosodyDomain) {
        logger.warn(`Cannot call user_exists on user on server ${server as string}.`)
        res.status(200).send('false')
        return
      }
      if (user && await prosodyUserRegistered(user as string)) {
        res.status(200).send('true')
        return
      }
      res.status(200).send('false')
    }
  ))

  router.post('/user/set_password', asyncMiddleware(
    async (req: Request, res: Response, _next: NextFunction) => {
      res.sendStatus(501)
    }
  ))

  router.post('/user/remove_user', asyncMiddleware(
    async (req: Request, res: Response, _next: NextFunction) => {
      res.sendStatus(501)
    }
  ))

  // router.get('/federation_server_infos', asyncMiddleware(
  //   async (req: Request, res: Response, _next: NextFunction) => {
  //     logger.info('federation_server_infos api call')
  //     // TODO/FIXME: return server infos.
  //     // TODO/FIXME: store these informations on the other side.
  //     res.json({ ok: true })
  //   }
  // ))

  if (isDebugMode(options)) {
    // Only add this route if the debug mode is enabled at time of the server launch.
    // Note: the isDebugMode will be tested again when the API is called.
    // Note: we dont authenticate the user. We want this API to be callable from debug tools.
    //       This should not be an issue, as debug_mode should only be available on dev environments.
    router.get('/restart_prosody', asyncMiddleware(
      async (req: Request, res: Response, _next: NextFunction) => {
        if (!isDebugMode(options)) {
          res.json({ ok: false })
          return
        }
        const restartProsodyInDebugMode = req.query.debugger === 'true'
        await ensureProsodyRunning(options, true, restartProsodyInDebugMode)
        res.json({ ok: true })
      }
    ))
  }

  return router
}

export {
  initApiRouter
}