From b88c9290a894eb756c491be5f8b9cdaa56e1bde0 Mon Sep 17 00:00:00 2001
From: davidgisbey <david.gisbey@digital.cabinet-office.gov.uk>
Date: Fri, 9 Sep 2022 12:32:08 +0100
Subject: [PATCH 1/3] Add View Component gem

---
 Gemfile      | 1 +
 Gemfile.lock | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/Gemfile b/Gemfile
index bb751e2d14..5a5b2d157d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -58,6 +58,7 @@ gem "sprockets-rails"
 gem "transitions", require: ["transitions", "active_record/transitions"]
 gem "uglifier"
 gem "validates_email_format_of"
+gem "view_component"
 gem "whenever", require: false
 
 group :development, :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index d8b1379a5b..e8e8863b5a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -717,6 +717,10 @@ GEM
     validates_email_format_of (1.7.2)
       i18n
     version_gem (1.1.0)
+    view_component (2.71.0)
+      activesupport (>= 5.0.0, < 8.0)
+      concurrent-ruby (~> 1.0)
+      method_source (~> 1.0)
     warden (1.2.9)
       rack (>= 2.0.9)
     warden-oauth2 (0.0.1)
@@ -828,6 +832,7 @@ DEPENDENCIES
   transitions
   uglifier
   validates_email_format_of
+  view_component
   webmock
   whenever
 

From d980aefc606b8c4c33f32bc6bb666708fc88b32e Mon Sep 17 00:00:00 2001
From: davidgisbey <david.gisbey@digital.cabinet-office.gov.uk>
Date: Mon, 12 Sep 2022 09:18:02 +0100
Subject: [PATCH 2/3] Exclude MissingSuper rule for components

---
 .rubocop.yml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/.rubocop.yml b/.rubocop.yml
index 99d15bb5e7..f253edae99 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -39,3 +39,7 @@ Rails/LexicallyScopedActionFilter:
 Style/OptionalBooleanParameter:
   Exclude:
     - 'app/workers/*.rb'
+
+Lint/MissingSuper:
+  Exclude:
+    - 'app/components/*/*.rb'

From 0bf361e23b9dac752447b34a9818def0da399654 Mon Sep 17 00:00:00 2001
From: Daniel Karaj <daniel.karaj@digital.cabinet-office.gov.uk>
Date: Tue, 25 Oct 2022 17:28:46 +0100
Subject: [PATCH 3/3] Introduce Form Cancel ViewComponent

Introduces a common ViewComponent to be used across forms to render a cancel link. In the bootstrap UI the path logic was present in the form builder. For the design system we're moving away from that.
---
 .../admin/form_cancel_component.html.erb      |  1 +
 app/components/admin/form_cancel_component.rb | 31 +++++++++++++++++++
 .../admin/form_cancel_component_test.rb       | 12 +++++++
 3 files changed, 44 insertions(+)
 create mode 100644 app/components/admin/form_cancel_component.html.erb
 create mode 100644 app/components/admin/form_cancel_component.rb
 create mode 100644 test/components/admin/form_cancel_component_test.rb

diff --git a/app/components/admin/form_cancel_component.html.erb b/app/components/admin/form_cancel_component.html.erb
new file mode 100644
index 0000000000..bd46bf80c7
--- /dev/null
+++ b/app/components/admin/form_cancel_component.html.erb
@@ -0,0 +1 @@
+<a class="govuk-link" href="<%= path %>">Cancel</a>
diff --git a/app/components/admin/form_cancel_component.rb b/app/components/admin/form_cancel_component.rb
new file mode 100644
index 0000000000..8408bc715d
--- /dev/null
+++ b/app/components/admin/form_cancel_component.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+class Admin::FormCancelComponent < ViewComponent::Base
+
+  def initialize(object:)
+    @url_maker = Whitehall::UrlMaker.new(host: Plek.find("whitehall"))
+    @object = object
+  end
+
+private
+
+  def path
+    if @object.new_record?
+      case @object
+      when CorporateInformationPage
+        @url_maker.polymorphic_path([:admin, @object.owning_organisation, CorporateInformationPage])
+      when Edition
+        @url_maker.admin_editions_path
+      else
+        @url_maker.polymorphic_path([:admin, @object.class])
+      end
+    else
+      case @object
+      when CorporateInformationPage, Edition
+        @url_maker.admin_edition_path(@object)
+      else
+        @url_maker.polymorphic_path([:admin, object])
+      end
+    end
+  end
+end
diff --git a/test/components/admin/form_cancel_component_test.rb b/test/components/admin/form_cancel_component_test.rb
new file mode 100644
index 0000000000..60a4a5484b
--- /dev/null
+++ b/test/components/admin/form_cancel_component_test.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+class Admin::FormCancelComponentTest < ViewComponent::TestCase
+  def test_component_renders_something_useful
+    # assert_equal(
+    #   %(<span>Hello, components!</span>),
+    #   render_inline(Admin::FormCancelComponent.new(message: "Hello, components!")).css("span").to_html
+    # )
+  end
+end