Add stats to ClassroomView

app/templates/courses/classroom-view.jade

@@ -17,7 +17,24 @@ block content
   if view.classroom.get('description')
     p= view.classroom.get('description')
     
-  // TODO: Add classroom statistics (grab from CourseDetailsView)
+  h3(data-i18n="courses.stats")
+  table.progress-stats-container
+    - var stats = view.classStats()
+    tr
+      td(data-i18n="courses.total_students")
+      td= _.size(view.classroom.get('members'))
+    tr
+      td(data-i18n="courses.average_time")
+      td= stats.averagePlaytime
+    tr
+      td(data-i18n="courses.total_time")
+      td= stats.totalPlaytime
+    tr
+      td(data-i18n="courses.average_levels")
+      td= stats.averageLevelsComplete
+    tr
+      td(data-i18n="courses.total_levels")
+      td= stats.totalLevelsComplete
     
   h1
     | Students
@@ -36,8 +53,8 @@ block content
         span.spl remove student
     
     h2= user.broadName()
-    - var lastPlayedString = view.makeLastPlayedString(user);
+    - var lastPlayedString = view.userLastPlayedString(user);
-    - var playtime = view.makePlaytimeString(user);
+    - var playtime = view.userPlaytimeString(user);
     if lastPlayedString || playtime
       #student-stats-row.row
         if lastPlayedString

app/views/courses/ClassroomView.coffee

@@ -44,6 +44,7 @@ module.exports = class ClassroomView extends RootView
     @users.comparator = (user) => user.broadName().toLowerCase()
     @supermodel.loadCollection(@users, 'users')
     @listenToOnce @courseInstances, 'sync', @onCourseInstancesSync
+    @sessions = new CocoCollection([], { model: LevelSession })
 
   onCourseInstancesSync: ->
     @sessions = new CocoCollection([], { model: LevelSession })
@@ -115,7 +116,7 @@ module.exports = class ClassroomView extends RootView
     @openModalView(modal)
     @listenToOnce modal, 'hidden', @render
 
-  makeLastPlayedString: (user) ->
+  userLastPlayedString: (user) ->
     session = user.sessions.last()
     return '' if not session
     campaign = session.collection.campaign
@@ -123,11 +124,28 @@ module.exports = class ClassroomView extends RootView
     campaignLevel = campaign.get('levels')[levelOriginal]
     return "#{campaign.get('fullName')}, #{campaignLevel.name}"
 
-  makePlaytimeString: (user) ->
+  userPlaytimeString: (user) ->
     playtime = _.reduce user.sessions.pluck('playtime'), (s1, s2) -> (s1 or 0) + (s2 or 0)
     return '' unless playtime
     return moment.duration(playtime, 'seconds').humanize()
 
+  classStats: ->
+    stats = {}
+    
+    playtime = 0
+    total = 0
+    for session in @sessions.models
+      pt = session.get('playtime') or 0
+      playtime += pt
+      total += 1
+    stats.averagePlaytime = if playtime and total then moment.duration(playtime / total, "seconds").humanize() else 0
+    stats.totalPlaytime = if playtime then moment.duration(playtime, "seconds").humanize() else 0
+    
+    completeSessions = @sessions.filter (s) -> s.get('state').complete
+    stats.averageLevelsComplete = if @users.size() then (_.size(completeSessions) / @users.size()).toFixed(1) else 'N/A'
+    stats.totalLevelsComplete = _.size(completeSessions)
+    return stats
+
   onClickAddStudentsButton: (e) ->
     modal = new InviteToClassroomModal({classroom: @classroom})
     @openModalView(modal)