Fix users removing last item of confirmed order on /cart page

app/assets/javascripts/darkswarm/controllers/edit_bought_order_controller.js.coffee

@@ -1,12 +1,19 @@
-Darkswarm.controller "EditBoughtOrderController", ($scope, $resource, Cart) ->
+Darkswarm.controller "EditBoughtOrderController", ($scope, $resource, $timeout, Cart) ->
   $scope.showBought = false
+  $scope.removeEnabled = true
 
   $scope.deleteLineItem = (id) ->
-    params = {id: id}
-    success = (response) ->
-      $(".line-item-" + id).remove()
-      Cart.removeFinalisedLineItem(id)
-    fail = (error) ->
-      console.log error
+    if Cart.check_last_finalised_item()
+      $scope.removeEnabled = false
+      $timeout (->
+        $scope.removeEnabled = true
+      ), 10000
+    else
+      params = {id: id}
+      success = (response) ->
+        $(".line-item-" + id).remove()
+        Cart.removeFinalisedLineItem(id)
+      fail = (error) ->
+        console.log error
 
-    $resource("/line_items/:id").delete(params, success, fail)
+      $resource("/line_items/:id").delete(params, success, fail)

app/assets/javascripts/darkswarm/services/cart.js.coffee

@@ -115,6 +115,12 @@ Darkswarm.factory 'Cart', (CurrentOrder, Variants, $timeout, $http, $modal, $roo
       @line_items = []
       localStorageService.clearAll() # One day this will have to be moar GRANULAR
 
+    check_last_finalised_item: =>
+      if @line_items_finalised.length == 1
+        Messages.error(t 'orders_cannot_remove_the_final_item')
+
+      @line_items_finalised.length == 1
+
     removeFinalisedLineItem: (id) =>
       @line_items_finalised = @line_items_finalised.filter (item) ->
         item.id != id

app/views/spree/orders/_bought.html.haml

@@ -28,5 +28,5 @@
         = line_item.display_amount_with_adjustments.to_html unless line_item.quantity.nil?
 
       %td.bought-item-delete.text-center
-        %a{ng: {click: "deleteLineItem(#{line_item.id})"}}
+        %a{ng: {click: "removeEnabled && deleteLineItem(#{line_item.id})"}}
           %i.ofn-i_026-trash

spec/javascripts/unit/darkswarm/services/cart_spec.js.coffee

@@ -222,6 +222,16 @@ describe 'Cart service', ->
         expect(li.quantity).toEqual 1
         expect(li.max_quantity).toEqual 1
 
+  describe "when modifying a confirmed order", ->
+    it "displays flash error when attempting to remove final item", ->
+      spyOn(RailsFlashLoader, 'loadFlash')
+      li = {variant: {id: 1}, quantity: 3}
+      Cart.line_items_finalised = [li]
+      Cart.check_last_finalised_item()
+      expect(RailsFlashLoader.loadFlash).toHaveBeenCalledWith(
+        {error: t 'orders_cannot_remove_the_final_item'}
+      )
+
   it "pops the queue", ->
     Cart.update_enqueued = true
     spyOn(Cart, 'scheduleUpdate')