import express from 'express'
import { isTestOrDevInstance } from '@server/helpers/core-utils'
import { OAuthClientModel } from '@server/models/oauth/oauth-client'
import { HttpStatusCode, OAuthClientLocal } from '@shared/models'
import { logger } from '../../helpers/logger'
import { CONFIG } from '../../initializers/config'
import { apiRateLimiter, asyncMiddleware, openapiOperationDoc } from '../../middlewares'

const oauthClientsRouter = express.Router()

oauthClientsRouter.use(apiRateLimiter)

oauthClientsRouter.get('/local',
  openapiOperationDoc({ operationId: 'getOAuthClient' }),
  asyncMiddleware(getLocalClient)
)

// Get the client credentials for the PeerTube front end
async function getLocalClient (req: express.Request, res: express.Response, next: express.NextFunction) {
  const serverHostname = CONFIG.WEBSERVER.HOSTNAME
  const serverPort = CONFIG.WEBSERVER.PORT
  let headerHostShouldBe = serverHostname
  if (serverPort !== 80 && serverPort !== 443) {
    headerHostShouldBe += ':' + serverPort
  }

  // Don't make this check if this is a test instance
  if (!isTestOrDevInstance() && req.get('host') !== headerHostShouldBe) {
    logger.info(
      'Getting client tokens for host %s is forbidden (expected %s).', req.get('host'), headerHostShouldBe,
      { webserverConfig: CONFIG.WEBSERVER }
    )

    return res.fail({
      status: HttpStatusCode.FORBIDDEN_403,
      message: `Getting client tokens for host ${req.get('host')} is forbidden`
    })
  }

  const client = await OAuthClientModel.loadFirstClient()
  if (!client) throw new Error('No client available.')

  const json: OAuthClientLocal = {
    client_id: client.clientId,
    client_secret: client.clientSecret
  }
  return res.json(json)
}

// ---------------------------------------------------------------------------

export {
  oauthClientsRouter
}