feat: Store alchemy_preview_time in current global

We need that to return content for given preview
time for the admin addition we made to alchemy.

Signed-off-by: Thomas von Deyen <thomas@vondeyen.com>

Author: tvdeyen

app/controllers/alchemy/json_api/admin/pages_controller.rb

@@ -7,6 +7,9 @@ class PagesController < JsonApi::PagesController
         prepend_before_action { authorize! :edit_content, Alchemy::Page }
         before_action :set_current_preview, only: :show
 
+        include Alchemy::Admin::Timezone
+        include Alchemy::Admin::PreviewTime
+
         private
 
         def cache_duration

spec/controllers/alchemy/json_api/admin/pages_controller_spec.rb

@@ -19,5 +19,19 @@
       get :show, params: {path: page.urlname}
       expect(Alchemy::Current.preview_page).to eq(page)
     end
+
+    context "with alchemy_preview_time param" do
+      it "stores preview time" do
+        preview_time = 1.day.from_now
+        get :show, params: {path: page.urlname, alchemy_preview_time: preview_time.iso8601}
+        expect(Alchemy::Current.preview_time).to be_within(1.second).of(preview_time)
+      end
+    end
+
+    it "runs action in given timezone" do
+      allow(Time).to receive(:use_zone).and_yield
+      get :show, params: {path: page.urlname, admin_timezone: "Hawaii"}
+      expect(Time).to have_received(:use_zone).with("Hawaii")
+    end
   end
 end