1 files changed, 83 insertions, 0 deletions
diff --git a/app/models/integrations/chat_message/merge_message.rb b/app/models/integrations/chat_message/merge_message.rb
new file mode 100644
index 00000000000..d2f48699f50
--- /dev/null
+++ b/app/models/integrations/chat_message/merge_message.rb
@@ -0,0 +1,83 @@
+# frozen_string_literal: true
+
+module Integrations
+  module ChatMessage
+    class MergeMessage < BaseMessage
+      attr_reader :merge_request_iid
+      attr_reader :source_branch
+      attr_reader :target_branch
+      attr_reader :action
+      attr_reader :state
+      attr_reader :title
+
+      def initialize(params)
+        super
+
+        obj_attr = params[:object_attributes]
+        obj_attr = HashWithIndifferentAccess.new(obj_attr)
+        @merge_request_iid = obj_attr[:iid]
+        @source_branch = obj_attr[:source_branch]
+        @target_branch = obj_attr[:target_branch]
+        @action = obj_attr[:action]
+        @state = obj_attr[:state]
+        @title = format_title(obj_attr[:title])
+      end
+
+      def attachments
+        []
+      end
+
+      def activity
+        {
+          title: "Merge request #{state_or_action_text} by #{user_combined_name}",
+          subtitle: "in #{project_link}",
+          text: merge_request_link,
+          image: user_avatar
+        }
+      end
+
+      private
+
+      def format_title(title)
+        '*' + title.lines.first.chomp + '*'
+      end
+
+      def message
+        merge_request_message
+      end
+
+      def project_link
+        link(project_name, project_url)
+      end
+
+      def merge_request_message
+        "#{user_combined_name} #{state_or_action_text} merge request #{merge_request_link} in #{project_link}"
+      end
+
+      def merge_request_link
+        link(merge_request_title, merge_request_url)
+      end
+
+      def merge_request_title
+        "#{MergeRequest.reference_prefix}#{merge_request_iid} #{title}"
+      end
+
+      def merge_request_url
+        "#{project_url}/-/merge_requests/#{merge_request_iid}"
+      end
+
+      def state_or_action_text
+        case action
+        when 'approved', 'unapproved'
+          action
+        when 'approval'
+          'added their approval to'
+        when 'unapproval'
+          'removed their approval from'
+        else
+          state
+        end
+      end
+    end
+  end
+end