Don't allow commenting while the thread is closed

When someone closes thread there is still option to add
comment which cause error when submitted. User shouldn't
be able to comment while the thread is closed.

TNL-150

common/static/coffee/spec/discussion/view/discussion_thread_view_spec.coffee

@@ -40,6 +40,32 @@ describe "DiscussionThreadView", ->
         else
             expect(view.$el.find(".load-response-button").length).toEqual(0)
 
+    describe "closed and open Threads", ->
+        checkCommentForm = (originallyClosed, mode) ->
+            threadData = DiscussionViewSpecHelper.makeThreadWithProps({closed: originallyClosed})
+            thread = new Thread(threadData)
+            view = new DiscussionThreadView({ model: thread, el: $("#fixture-element"), mode: mode})
+            renderWithContent(view, {resp_total: 1, children: [{}]})
+            if mode == "inline"
+              view.expand()
+            spyOn(DiscussionUtil, "updateWithUndo").andCallFake(
+              (model, updates, safeAjaxParams, errorMsg) ->
+                model.set(updates)
+            )
+            expect(view.$('.comment-form').closest('li').is(":visible")).toBe(not originallyClosed)
+            expect(view.$(".discussion-reply-new").is(":visible")).toBe(not originallyClosed)
+            view.$(".action-close").click()
+            expect(view.$('.comment-form').closest('li').is(":visible")).toBe(originallyClosed)
+            expect(view.$(".discussion-reply-new").is(":visible")).toBe(originallyClosed)
+
+        _.each(["tab", "inline"], (mode) =>
+                it 'Test that in #{mode} mode when a closed thread is opened the comment form is displayed', ->
+                        checkCommentForm(true, mode)
+
+                it 'Test that in #{mode} mode when a open thread is closed the comment form is hidden', ->
+                        checkCommentForm(false, mode)
+        )
+
     describe "tab mode", ->
         beforeEach ->
             @view = new DiscussionThreadView({ model: @thread, el: $("#fixture-element"), mode: "tab"})

common/static/coffee/spec/discussion/view/thread_response_view_spec.coffee

@@ -3,13 +3,42 @@ describe 'ThreadResponseView', ->
         DiscussionSpecHelper.setUpGlobals()
         DiscussionSpecHelper.setUnderscoreFixtures()
 
+        @thread = new Thread({"thread_type": "discussion"})
         @response = new Comment {
-            children: [{}, {}]
+            children: [{}, {}],
+            thread: @thread,
         }
         @view = new ThreadResponseView({model: @response, el: $("#fixture-element")})
         spyOn(ThreadResponseShowView.prototype, "render")
         spyOn(ResponseCommentView.prototype, "render")
 
+    describe 'closed and open Threads', ->
+        checkCommentForm = (closed) ->
+            thread = new Thread({"thread_type": "discussion", "closed": closed})
+            commentData = {
+                id: "dummy",
+                user_id: "567",
+                course_id: "TestOrg/TestCourse/TestRun",
+                body: "this is a comment",
+                created_at: "2013-04-03T20:08:39Z",
+                abuse_flaggers: [],
+                type: "comment",
+                children: [],
+                thread: thread,
+            }
+            comment = new Comment(commentData)
+            view = new ThreadResponseView({
+                model: comment, el: $("#fixture-element"),
+            })
+            view.render()
+            expect(view.$('.comment-form').closest('li').is(":visible")).toBe(not closed)
+
+        it 'hides comment form when thread is closed', ->
+            checkCommentForm(true)
+
+        it 'show comment form when thread is open', ->
+            checkCommentForm(false)
+
     describe 'renderComments', ->
         it 'hides "show comments" link if collapseComments is not set', ->
             @view.render()
@@ -17,7 +46,7 @@ describe 'ThreadResponseView', ->
             expect(@view.$(".action-show-comments")).not.toBeVisible()
 
         it 'hides "show comments" link if collapseComments is set but response has no comments', ->
-            @response = new Comment { children: [] }
+            @response = new Comment { children: [], thread: @thread }
             @view = new ThreadResponseView({
                 model: @response, el: $("#fixture-element"),
                 collapseComments: true

common/static/coffee/src/discussion/views/discussion_thread_view.coffee

@@ -55,6 +55,7 @@ if Backbone?
     attrRenderer: $.extend({}, DiscussionContentView.prototype.attrRenderer, {
       closed: (closed) ->
         @$(".discussion-reply-new").toggle(not closed)
+        @$('.comment-form').closest('li').toggle(not closed)
         @renderAddResponseButton()
     })
 

common/static/coffee/src/discussion/views/thread_response_view.coffee

@@ -28,6 +28,8 @@ if Backbone?
 
       @renderShowView()
       @renderAttrs()
+      if @model.get("thread").get("closed")
+        @hideCommentForm()
 
       @renderComments()
       @