Present 'Play Classroom Version' before playing a campaign level when appropriate

app/locale/en.coffee

@@ -79,6 +79,7 @@
     subscription_required: "Subscription Required"
     anonymous: "Anonymous Player"
     level_difficulty: "Difficulty: "
+    play_classroom_version: "Play Classroom Version"  # Choose a level in campaign version that you also can play in one of your courses
     campaign_beginner: "Beginner Campaign"
     awaiting_levels_adventurer_prefix: "We release new levels every week."
     awaiting_levels_adventurer: "Sign up as an Adventurer"

app/styles/play/campaign-view.sass

@@ -292,6 +292,9 @@ $gameControlMargin: 30px
           .view-solutions
             margin: 10px 5px 0 0
 
+        .course-version
+          text-align: center
+
     .campaign-switch
       color: purple
       position: absolute

app/templates/play/campaign-view.jade

@@ -55,6 +55,13 @@ if campaign
                 button.btn.btn-warning.btn.btn-lg.btn-illustrated.view-solutions(data-level-slug=level.slug)
                   span(data-i18n="leaderboard.scores")
               button.btn.btn-success.btn.btn-lg.btn-illustrated.start-level(data-i18n="common.play") Play
+              if me.get('courseInstances') && me.get('courseInstances').length
+                .course-version.hidden(data-level-original=level.original)
+                  em(data-i18n="general.or")
+                  | ...
+                  br
+                  button.btn.btn-primary.btn.btn-lg.btn-illustrated
+                    span(data-i18n="play.play_classroom_version") Play Classroom Version
       else if level.unlocksHero && !level.purchasedHero
         img.hero-portrait(src="/file/db/thang.type/#{level.unlocksHero}/portrait.png", style="left: #{level.position.x}%; bottom: #{level.position.y}%;")
 

app/views/play/CampaignView.coffee

@@ -21,6 +21,7 @@ UserPollsRecord = require 'models/UserPollsRecord'
 Poll = require 'models/Poll'
 PollModal = require 'views/play/modal/PollModal'
 storage = require 'core/storage'
+CourseInstance = require 'models/CourseInstance'
 
 trackedHourOfCode = false
 
@@ -50,6 +51,7 @@ module.exports = class CampaignView extends RootView
     'dblclick .level a': 'onDoubleClickLevel'
     'click .level-info-container .start-level': 'onClickStartLevel'
     'click .level-info-container .view-solutions': 'onClickViewSolutions'
+    'click .level-info-container .course-version button': 'onClickCourseVersion'
     'click #volume-button': 'onToggleVolume'
     'click #back-button': 'onClickBack'
     'click #clear-storage-button': 'onClickClearStorage'
@@ -459,6 +461,7 @@ module.exports = class CampaignView extends RootView
     if @editorMode
       return @trigger 'level-clicked', levelOriginal
     @$levelInfo = @$el.find(".level-info-container[data-level-slug=#{levelSlug}]").show()
+    @checkForCourseOption levelOriginal
     @adjustLevelInfoPosition e
     @endHighlight()
     @preloadLevel levelSlug
@@ -484,6 +487,13 @@ module.exports = class CampaignView extends RootView
       @startLevel levelElement
       window.tracker?.trackEvent 'Clicked Start Level', category: 'World Map', levelID: levelSlug
 
+  onClickCourseVersion: (e) ->
+    levelSlug = $(e.target).parents('.level-info-container').data 'level-slug'
+    courseID = $(e.target).parents('.course-version').data 'course-id'
+    courseInstanceID = $(e.target).parents('.course-version').data 'course-instance-id'
+    url = "/play/level/#{levelSlug}?course=#{courseID}&course-instance=#{courseInstanceID}"
+    Backbone.Mediator.publish 'router:navigate', route: url
+
   startLevel: (levelElement) ->
     @setupManager?.destroy()
     levelSlug = levelElement.data 'level-slug'
@@ -555,6 +565,19 @@ module.exports = class CampaignView extends RootView
     Backbone.Mediator.publish 'music-player:play-music', play: true, file: musicFile
     storage.save("loaded-menu-music", true) unless @probablyCachedMusic
 
+  checkForCourseOption: (levelOriginal) ->
+    return unless me.get('courseInstances')?.length
+    @courseOptionsChecked ?= {}
+    return if @courseOptionsChecked[levelOriginal]
+    @courseOptionsChecked[levelOriginal] = true
+    courseInstances = new CocoCollection [], url: "/db/course_instance/-/find_by_level/#{levelOriginal}", model: CourseInstance
+    courseInstances.comparator = (ci) -> return -(ci.get('members') ? []).length
+    @supermodel.loadCollection courseInstances, 'course_instances'
+    @listenToOnce courseInstances, 'sync', =>
+      return if @destroyed
+      return unless courseInstance = courseInstances.models[0]
+      @$el.find(".course-version[data-level-original='#{levelOriginal}']").removeClass('hidden').data('course-id': courseInstance.get('courseID'), 'course-instance-id': courseInstance.id)
+
   preloadTopHeroes: ->
     for heroID in ['captain', 'knight']
       url = "/db/thang.type/#{ThangType.heroes[heroID]}/version"

server/courses/course_instance_handler.coffee

@@ -38,6 +38,7 @@ CourseInstanceHandler = class CourseInstanceHandler extends Handler
     return @getMembersAPI(req, res, args[0]) if args[1] is 'members'
     return @inviteStudents(req, res, args[0]) if relationship is 'invite_students'
     return @redeemPrepaidCodeAPI(req, res) if args[1] is 'redeem_prepaid'
+    return @findByLevel(req, res, args[2]) if args[1] is 'find_by_level'
     super arguments...
 
   createHOCAPI: (req, res) ->
@@ -206,6 +207,23 @@ CourseInstanceHandler = class CourseInstanceHandler extends Handler
             return @sendDatabaseError(res, err) if err
             @sendSuccess(res, courseInstances)
 
+  findByLevel: (req, res, levelOriginal) ->
+    # Find all CourseInstances that req.user is a part of that match the given level.
+    CourseInstance.find {_id: {$in: req.user.get('courseInstances')}},  (err, courseInstances) =>
+      return @sendDatabaseError res, err if err
+      return @sendSuccess res, [] unless courseInstances.length
+      courseIDs = _.uniq (ci.get('courseID') for ci in courseInstances)
+      Course.find {_id: {$in: courseIDs}}, {name: 1, campaignID: 1}, (err, courses) =>
+        return @sendDatabaseError res, err if err
+        return @sendSuccess res, [] unless courses.length
+        campaignIDs = _.uniq (c.get('campaignID') for c in courses)
+        Campaign.find {_id: {$in: campaignIDs}, "levels.#{levelOriginal}": {$exists: true}}, {_id: 1}, (err, campaigns) =>
+          return @sendDatabaseError res, err if err
+          return @sendSuccess res, [] unless campaigns.length
+          courses = _.filter courses, (course) -> _.find campaigns, (campaign) -> campaign.get('_id').toString() is course.get('campaignID').toString()
+          courseInstances = _.filter courseInstances, (courseInstance) -> _.find courses, (course) -> course.get('_id').toString() is courseInstance.get('courseID').toString()
+          return @sendSuccess res, courseInstances
+
   get: (req, res) ->
     if ownerID = req.query.ownerID
       return @sendForbiddenError(res) unless req.user and (req.user.isAdmin() or ownerID is req.user.id)