+'use strict'
+
+const express = require('express')
+const waterfall = require('async/waterfall')
+
+const constants = require('../../../initializers/constants')
+const db = require('../../../initializers/database')
+const logger = require('../../../helpers/logger')
+const friends = require('../../../lib/friends')
+const middlewares = require('../../../middlewares')
+const oAuth = middlewares.oauth
+const validators = middlewares.validators
+const validatorsVideos = validators.videos
+const databaseUtils = require('../../../helpers/database-utils')
+
+const router = express.Router()
+
+router.put('/:id/rate',
+ oAuth.authenticate,
+ validatorsVideos.videoRate,
+ rateVideoRetryWrapper
+)
+
+// ---------------------------------------------------------------------------
+
+module.exports = router
+
+// ---------------------------------------------------------------------------
+
+function rateVideoRetryWrapper (req, res, next) {
+ const options = {
+ arguments: [ req, res ],
+ errorMessage: 'Cannot update the user video rate.'
+ }
+
+ databaseUtils.retryTransactionWrapper(rateVideo, options, function (err) {
+ if (err) return next(err)
+
+ return res.type('json').status(204).end()
+ })
+}
+
+function rateVideo (req, res, finalCallback) {
+ const rateType = req.body.rating
+ const videoInstance = res.locals.video
+ const userInstance = res.locals.oauth.token.User
+
+ waterfall([
+ databaseUtils.startSerializableTransaction,
+
+ function findPreviousRate (t, callback) {
+ db.UserVideoRate.load(userInstance.id, videoInstance.id, t, function (err, previousRate) {
+ return callback(err, t, previousRate)
+ })
+ },
+
+ function insertUserRateIntoDB (t, previousRate, callback) {
+ const options = { transaction: t }
+
+ let likesToIncrement = 0
+ let dislikesToIncrement = 0
+
+ if (rateType === constants.VIDEO_RATE_TYPES.LIKE) likesToIncrement++
+ else if (rateType === constants.VIDEO_RATE_TYPES.DISLIKE) dislikesToIncrement++
+
+ // There was a previous rate, update it
+ if (previousRate) {
+ // We will remove the previous rate, so we will need to remove it from the video attribute
+ if (previousRate.type === constants.VIDEO_RATE_TYPES.LIKE) likesToIncrement--
+ else if (previousRate.type === constants.VIDEO_RATE_TYPES.DISLIKE) dislikesToIncrement--
+
+ previousRate.type = rateType
+
+ previousRate.save(options).asCallback(function (err) {
+ return callback(err, t, likesToIncrement, dislikesToIncrement)
+ })
+ } else { // There was not a previous rate, insert a new one
+ const query = {
+ userId: userInstance.id,
+ videoId: videoInstance.id,
+ type: rateType
+ }
+
+ db.UserVideoRate.create(query, options).asCallback(function (err) {
+ return callback(err, t, likesToIncrement, dislikesToIncrement)
+ })
+ }
+ },
+
+ function updateVideoAttributeDB (t, likesToIncrement, dislikesToIncrement, callback) {
+ const options = { transaction: t }
+ const incrementQuery = {
+ likes: likesToIncrement,
+ dislikes: dislikesToIncrement
+ }
+
+ // Even if we do not own the video we increment the attributes
+ // It is usefull for the user to have a feedback
+ videoInstance.increment(incrementQuery, options).asCallback(function (err) {
+ return callback(err, t, likesToIncrement, dislikesToIncrement)
+ })
+ },
+
+ function sendEventsToFriendsIfNeeded (t, likesToIncrement, dislikesToIncrement, callback) {
+ // No need for an event type, we own the video
+ if (videoInstance.isOwned()) return callback(null, t, likesToIncrement, dislikesToIncrement)
+
+ const eventsParams = []
+
+ if (likesToIncrement !== 0) {
+ eventsParams.push({
+ videoId: videoInstance.id,
+ type: constants.REQUEST_VIDEO_EVENT_TYPES.LIKES,
+ count: likesToIncrement
+ })
+ }
+
+ if (dislikesToIncrement !== 0) {
+ eventsParams.push({
+ videoId: videoInstance.id,
+ type: constants.REQUEST_VIDEO_EVENT_TYPES.DISLIKES,
+ count: dislikesToIncrement
+ })
+ }
+
+ friends.addEventsToRemoteVideo(eventsParams, t, function (err) {
+ return callback(err, t, likesToIncrement, dislikesToIncrement)
+ })
+ },
+
+ function sendQaduToFriendsIfNeeded (t, likesToIncrement, dislikesToIncrement, callback) {
+ // We do not own the video, there is no need to send a quick and dirty update to friends
+ // Our rate was already sent by the addEvent function
+ if (videoInstance.isOwned() === false) return callback(null, t)
+
+ const qadusParams = []
+
+ if (likesToIncrement !== 0) {
+ qadusParams.push({
+ videoId: videoInstance.id,
+ type: constants.REQUEST_VIDEO_QADU_TYPES.LIKES
+ })
+ }
+
+ if (dislikesToIncrement !== 0) {
+ qadusParams.push({
+ videoId: videoInstance.id,
+ type: constants.REQUEST_VIDEO_QADU_TYPES.DISLIKES
+ })
+ }
+
+ friends.quickAndDirtyUpdatesVideoToFriends(qadusParams, t, function (err) {
+ return callback(err, t)
+ })
+ },
+
+ databaseUtils.commitTransaction
+
+ ], function (err, t) {
+ if (err) {
+ // This is just a debug because we will retry the insert
+ logger.debug('Cannot add the user video rate.', { error: err })
+ return databaseUtils.rollbackTransaction(err, t, finalCallback)
+ }
+
+ logger.info('User video rate for video %s of user %s updated.', videoInstance.name, userInstance.username)
+ return finalCallback(null)
+ })
+}