import express from 'express'
import { body, param, query } from 'express-validator'
import { exists, isUUIDValid } from '@server/helpers/custom-validators/misc'
import {
  isRunnerJobAbortReasonValid,
  isRunnerJobArrayOfStateValid,
  isRunnerJobErrorMessageValid,
  isRunnerJobProgressValid,
  isRunnerJobSuccessPayloadValid,
  isRunnerJobTokenValid,
  isRunnerJobUpdatePayloadValid
} from '@server/helpers/custom-validators/runners/jobs'
import { isRunnerTokenValid } from '@server/helpers/custom-validators/runners/runners'
import { cleanUpReqFiles } from '@server/helpers/express-utils'
import { LiveManager } from '@server/lib/live'
import { runnerJobCanBeCancelled } from '@server/lib/runners'
import { RunnerJobModel } from '@server/models/runner/runner-job'
import { arrayify } from '@shared/core-utils'
import {
  HttpStatusCode,
  RunnerJobLiveRTMPHLSTranscodingPrivatePayload,
  RunnerJobState,
  RunnerJobSuccessBody,
  RunnerJobUpdateBody,
  ServerErrorCode
} from '@shared/models'
import { areValidationErrors } from '../shared'

const tags = [ 'runner' ]

export const acceptRunnerJobValidator = [
  (req: express.Request, res: express.Response, next: express.NextFunction) => {
    if (res.locals.runnerJob.state !== RunnerJobState.PENDING) {
      return res.fail({
        status: HttpStatusCode.BAD_REQUEST_400,
        message: 'This runner job is not in pending state',
        tags
      })
    }

    return next()
  }
]

export const abortRunnerJobValidator = [
  body('reason').custom(isRunnerJobAbortReasonValid),

  (req: express.Request, res: express.Response, next: express.NextFunction) => {
    if (areValidationErrors(req, res, { tags })) return

    return next()
  }
]

export const updateRunnerJobValidator = [
  body('progress').optional().custom(isRunnerJobProgressValid),

  (req: express.Request, res: express.Response, next: express.NextFunction) => {
    if (areValidationErrors(req, res, { tags })) return cleanUpReqFiles(req)

    const body = req.body as RunnerJobUpdateBody
    const job = res.locals.runnerJob

    if (isRunnerJobUpdatePayloadValid(body.payload, job.type, req.files) !== true) {
      cleanUpReqFiles(req)

      return res.fail({
        status: HttpStatusCode.BAD_REQUEST_400,
        message: 'Payload is invalid',
        tags
      })
    }

    if (res.locals.runnerJob.type === 'live-rtmp-hls-transcoding') {
      const privatePayload = job.privatePayload as RunnerJobLiveRTMPHLSTranscodingPrivatePayload

      if (!LiveManager.Instance.hasSession(privatePayload.sessionId)) {
        cleanUpReqFiles(req)

        return res.fail({
          status: HttpStatusCode.BAD_REQUEST_400,
          type: ServerErrorCode.RUNNER_JOB_NOT_IN_PROCESSING_STATE,
          message: 'Session of this live ended',
          tags
        })
      }
    }

    return next()
  }
]

export const errorRunnerJobValidator = [
  body('message').custom(isRunnerJobErrorMessageValid),

  (req: express.Request, res: express.Response, next: express.NextFunction) => {
    if (areValidationErrors(req, res, { tags })) return

    return next()
  }
]

export const successRunnerJobValidator = [
  (req: express.Request, res: express.Response, next: express.NextFunction) => {
    const body = req.body as RunnerJobSuccessBody

    if (isRunnerJobSuccessPayloadValid(body.payload, res.locals.runnerJob.type, req.files) !== true) {
      cleanUpReqFiles(req)

      return res.fail({
        status: HttpStatusCode.BAD_REQUEST_400,
        message: 'Payload is invalid',
        tags
      })
    }

    return next()
  }
]

export const cancelRunnerJobValidator = [
  (req: express.Request, res: express.Response, next: express.NextFunction) => {
    const runnerJob = res.locals.runnerJob

    if (runnerJobCanBeCancelled(runnerJob) !== true) {
      return res.fail({
        status: HttpStatusCode.BAD_REQUEST_400,
        message: 'Cannot cancel this job that is not in "pending", "processing" or "waiting for parent job" state',
        tags
      })
    }

    return next()
  }
]

export const listRunnerJobsValidator = [
  query('search')
    .optional()
    .custom(exists),

  query('stateOneOf')
    .optional()
    .customSanitizer(arrayify)
    .custom(isRunnerJobArrayOfStateValid),

  (req: express.Request, res: express.Response, next: express.NextFunction) => {
    return next()
  }
]

export const runnerJobGetValidator = [
  param('jobUUID').custom(isUUIDValid),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    if (areValidationErrors(req, res, { tags })) return

    const runnerJob = await RunnerJobModel.loadWithRunner(req.params.jobUUID)

    if (!runnerJob) {
      return res.fail({
        status: HttpStatusCode.NOT_FOUND_404,
        message: 'Unknown runner job',
        tags
      })
    }

    res.locals.runnerJob = runnerJob

    return next()
  }
]

export function jobOfRunnerGetValidatorFactory (allowedStates: RunnerJobState[]) {
  return [
    param('jobUUID').custom(isUUIDValid),

    body('runnerToken').custom(isRunnerTokenValid),
    body('jobToken').custom(isRunnerJobTokenValid),

    async (req: express.Request, res: express.Response, next: express.NextFunction) => {
      if (areValidationErrors(req, res, { tags })) return cleanUpReqFiles(req)

      const runnerJob = await RunnerJobModel.loadByRunnerAndJobTokensWithRunner({
        uuid: req.params.jobUUID,
        runnerToken: req.body.runnerToken,
        jobToken: req.body.jobToken
      })

      if (!runnerJob) {
        cleanUpReqFiles(req)

        return res.fail({
          status: HttpStatusCode.NOT_FOUND_404,
          message: 'Unknown runner job',
          tags
        })
      }

      if (!allowedStates.includes(runnerJob.state)) {
        cleanUpReqFiles(req)

        return res.fail({
          status: HttpStatusCode.BAD_REQUEST_400,
          type: ServerErrorCode.RUNNER_JOB_NOT_IN_PROCESSING_STATE,
          message: 'Job is not in "processing" state',
          tags
        })
      }

      res.locals.runnerJob = runnerJob

      return next()
    }
  ]
}