module Rails
  module Generators
    class ChannelGenerator < NamedBase
      source_root File.expand_path("../templates", __FILE__)

      argument :actions, type: :array, default: [], banner: "method method"

      class_option :assets, type: :boolean

      check_class_collision suffix: "Channel"

      def create_channel_file
        template "channel.rb", File.join("app/channels", class_path, "#{file_name}_channel.rb")

        if options[:assets]
          if behavior == :invoke
            template "assets/cable.js", "app/assets/javascripts/cable.js"
          end

          js_template "assets/channel", File.join("app/assets/javascripts/channels", class_path, "#{file_name}")
        end

        generate_application_cable_files
      end

      private
        def file_name
          @_file_name ||= super.gsub(/_channel/i, "")
        end

        # FIXME: Change these files to symlinks once RubyGems 2.5.0 is required.
        def generate_application_cable_files
          return if behavior != :invoke

          files = [
            "application_cable/channel.rb",
            "application_cable/connection.rb"
          ]

          files.each do |name|
            path = File.join("app/channels/", name)
            template(name, path) if !File.exist?(path)
          end
        end
    end
  end
end
