First steps on refactoring Mattermost Slash commands

Now, each subcommand has its own service, plus I've introduced
presenters to be able to delegate the generation of the views.

1 files changed, 84 insertions, 0 deletions

diff --git a/lib/mattermost/presenter.rb b/lib/mattermost/presenter.rb
new file mode 100644
index 00000000000..d8e3b3805f9
--- /dev/null
+++ b/lib/mattermost/presenter.rb
@@ -0,0 +1,84 @@
+module Mattermost
+  class Presenter
+    class << self
+      COMMAND_PREFIX = '/gitlab'.freeze
+
+      def authorize_chat_name(params)
+        url = ChatNames::RequestService.new(service, params).execute
+
+        {
+          response_type: :ephemeral,
+          message: "You are not authorized. Click this [link](#{url}) to authorize."
+        }
+      end
+
+      # TODO figure out how I know which are available or not
+      def help_message(commands)
+        messages = ["Available commands:"]
+
+        commands.each do |sub_command, attrs|
+          messages << "\t#{COMMAND_PREFIX} #{attrs[:help_message]}"
+        end
+
+        {
+          response_type: :ephemeral,
+          text: messages.join("\n")
+        }
+      end
+
+      def not_found
+        {
+          response_type: :ephemeral,
+          text: "404 not found! GitLab couldn't find what your were looking for! :boom:",
+        }
+      end
+    end
+
+    attr_reader :result
+
+    def initialize(result)
+      @result = result
+    end
+
+    def present
+      if result.respond_to?(:count)
+        if result.count > 1
+          return respond_collection(result)
+        elsif result.count == 0
+          return not_found
+        else
+          result = result.first
+        end
+      end
+
+      single_resource
+    end
+
+    private
+
+    def single_resource
+      message = title(resource)
+      message << "\n\n#{resource.description}" if resource.description
+
+      {
+        response_type: :in_channel,
+        text: message
+      }
+    end
+
+    def multiple_resources(resources)
+      message = "Multiple results were found:\n"
+      message << resource.map { |resource| "  #{title(resource)}" }.join("\n")
+
+      {
+        response_type: :ephemeral,
+        text: message
+      }
+    end
+
+    def title(resource)
+      url = url_for([resource.project.namespace.becomes(Namespace), resource.project, resource])
+      "### [#{resource.to_reference} #{resource.title}](#{url})"
+    end
+  end
+end