module Gitlab
  module SlashCommands
    module Presenters
      class Base
        include Gitlab::Routing.url_helpers

        def initialize(resource = nil)
          @resource = resource
        end

        def display_errors
          message = header_with_list("The action was not successful, because:", @resource.errors.full_messages)

          ephemeral_response(text: message)
        end

        private

        def header_with_list(header, items)
          message = [header]

          items.each do |item|
            message << "- #{item}"
          end

          message.join("\n")
        end

        def ephemeral_response(message)
          response = {
            response_type: :ephemeral,
            status: 200
          }.merge(message)

          format_response(response)
        end

        def in_channel_response(message)
          response = {
            response_type: :in_channel,
            status: 200
          }.merge(message)

          format_response(response)
        end

        def format_response(response)
          response[:text] = format(response[:text]) if response.key?(:text)

          if response.key?(:attachments)
            response[:attachments].each do |attachment|
              attachment[:pretext] = format(attachment[:pretext]) if attachment[:pretext]
              attachment[:text] = format(attachment[:text]) if attachment[:text]
            end
          end

          response
        end

        # Convert Markdown to slacks format
        def format(string)
          Slack::Notifier::LinkFormatter.format(string)
        end

        def resource_url
          url_for(
            [
              @resource.project.namespace.becomes(Namespace),
              @resource.project,
              @resource
            ]
          )
        end
      end
    end
  end
end
