Added random session pair choosing

Due to a bug I cannot test this immediately

app/views/play/spectate_view.coffee

@@ -423,14 +423,30 @@ module.exports = class SpectateLevelView extends View
 
   onNextGamePressed: (e) ->
     console.log "You want to see the next game!"
-    @sessionOne = "53193c8f7a89df21c4d968e9"
-    @sessionTwo = "531aa613026834331eac5e7e"
-    url = "/play/spectate/dungeon-arena?session-one=#{@sessionOne}&session-two=#{@sessionTwo}"
-    Backbone.Mediator.publish 'router:navigate', {
-      route: url,
-      viewClass: SpectateLevelView,
-      viewArgs: [{spectateSessions:{sessionOne: @sessionOne, sessionTwo: @sessionTwo}}, "dungeon-arena"]}
+    @fetchRandomSessionPair (err, data) =>
+      if err? then return console.log "There was an error fetching the random session pair: #{data}"
+      @sessionOne = data[0]._id
+      @sessionTwo = data[1]._id
+      console.log "Playing session #{@sessionOne} against #{@sessionTwo}"
+      url = "/play/spectate/dungeon-arena?session-one=#{@sessionOne}&session-two=#{@sessionTwo}"
+      Backbone.Mediator.publish 'router:navigate', {
+        route: url,
+        viewClass: SpectateLevelView,
+        viewArgs: [{spectateSessions:{sessionOne: @sessionOne, sessionTwo: @sessionTwo}}, "dungeon-arena"]}
 
+  fetchRandomSessionPair: (cb) ->
+    console.log "Fetching random session pair!"
+    randomSessionPairURL = "/db/level/#{@level.get('original')}.#{@level.get('version').major}/random_session_pair"
+    $.ajax
+      url: randomSessionPairURL
+      type: "GET"
+      complete: (jqxhr, textStatus) ->
+        if textStatus isnt "success"
+          cb("error", jqxhr.statusText)
+        else
+          cb(null, $.parseJSON(jqxhr.responseText))
+        
+      
     
     
 

server/levels/level_handler.coffee

@@ -31,6 +31,8 @@ LevelHandler = class LevelHandler extends Handler
     return @getLeaderboard(req, res, args[0]) if args[1] is 'leaderboard'
     return @getMySessions(req, res, args[0]) if args[1] is 'my_sessions'
     return @getFeedback(req, res, args[0]) if args[1] is 'feedback'
+    return @getRandomSessionPair(req,res,args[0]) if args[1] is 'random_session_pair'
+    
     return @sendNotFoundError(res)
 
   fetchLevelByIDAndHandleErrors: (id, req, res, callback) ->
@@ -146,6 +148,41 @@ LevelHandler = class LevelHandler extends Handler
       return @sendDatabaseError(res, err) if err
       resultSessions ?= []
       @sendSuccess res, resultSessions
+      
+  getRandomSessionPair: (req, res, id) ->
+    findParameters = {}
+    
+    [original,version] = id.split '.'
+    version = parseInt(version) ? 0
+
+    sessionsQueryParameters =
+      level:
+        original: original
+        majorVersion: version
+      submitted:true
+      
+    
+    query = Session
+      .find(sessionsQueryParameters)
+      .select('team')
+      .lean()
+    
+    query.exec (err, resultSessions) =>
+      return @sendDatabaseError res, err if err? or not resultSessions
+      
+      teamSessions = _.groupBy resultSessions, 'team'
+      sessions = []
+      numberOfTeams = 0
+      for team of teamSessions
+        numberOfTeams += 1
+        sessions.push _.sample(teamSessions[team])
+      if numberOfTeams != 2 then return @sendDatabaseError res, "There aren't sessions of 2 teams, so cannot choose random opponents!"
+        
+      @sendSuccess res, sessions
+      
+      
+    
+    
 
   validateLeaderboardRequestParameters: (req) ->
     req.query.order = parseInt(req.query.order) ? -1