ika_bot/lib/ika/plugin/lesson_plugin.rb

require_relative "../../lesson"

class Plugin
  class LessonPlugin < Plugin
    attr_reader :lessons

    def initialize(ika)
      super
      @lessons = {}
    end

    def handle_message(message)
      super
      Message.new(self, message).handle
    end

    def can_handle_message?(message)
      return true if message.content == "!lesson"
      return true if message.content == "!stoplesson"

      lessons[message.channel.id]&.can_handle_message?(message)
    end

    class Message
      attr_reader :plugin, :message

      def initialize(plugin, message)
        @plugin = plugin
        @message = message
      end

      def content
        message.content
      end

      def responder
        message.responder
      end

      def respond(response)
        responder.call response
      end

      def handle
        return handle_lesson if content == "!lesson"
        return handle_stoplesson if content == "!stoplesson"

        lesson.handle_message(message)
      end

      def lesson
        lsn = plugin.lessons[message.channel.id]
        return lsn if lsn

        lsn = Lesson.new responder: responder
        plugin.lessons[message.channel.id] = lsn
      end

      def handle_lesson
        if lesson.running?
          respond "There's already a lesson running!"
        else
          respond "Starting a lesson now!"
          lesson.start!
        end
      end

      def handle_stoplesson
        if lesson.running?
          respond "Ending the current lesson"
          lesson.stop!
        else
          respond "There's no lesson running"
        end
      end
    end
  end
end