require "rails/generators"

module CanvasSync
  class InstallLiveEventsGenerator < Rails::Generators::Base
    source_root File.expand_path("../templates/services/live_events", __FILE__)
    class_option :events, type: :string, required: true

    def autogenerated_event_warning
      <<-HERE.strip_heredoc
        #
        # AUTO GENERATED LIVE EVENT
        # This was auto generated by the CanvasSync Gem.
        # You can customize it as needed, but make sure you test
        # any changes you make to the auto generated methods.
        #
        # LiveEvent message formats can be found at https://canvas.instructure.com/doc/api/file.live_events.html
        # In the general case, LiveEvent message content should not be trusted - it is highly possible that events may
        # arrive out of order. Most of the CanvasSync LiveEvent templates solve this by always fetching the object from the API.
        #
      HERE
    end

    # Generates the specified live events. Invoke with:
    #
    # bin/rails generate canvas_sync:install_live_events --events users,courses
    #
    # Install all live events with:
    #
    # bin/rails generate canvas_sync:install_live_events --events all
    def generate_live_events
      events = options["events"] == "all" ? CanvasSync::SUPPORTED_LIVE_EVENTS : options["events"].split(",")
      CanvasSync.validate_live_events!(events)

      events.each do |event|
        Dir.glob("#{File.dirname(__FILE__)}/templates/services/live_events/#{event}_event.rb") do |rb_file|
          template rb_file.to_s, "app/services/live_events/#{File.basename(rb_file)}"
        end
      end
      template "base_event.rb", "app/services/live_events/base_event.rb"
    end
  end
end