text_message_handler.rb

require "line/bot"
require './cartridge_dao'

class TextMessageHandler
    def initialize(client)
        @client = client
    end

    def handle(event)
        text = event.message['text']
        case text
        when 'latest'
            cartridges = CartridgeDAO.latests(5)
            if cartridges.length > 0
                latest_cartridges(event, cartridges)
            else
                reply_text(event, 'No cartridges. Create one !')
            end
        else
            if text.start_with?('line://')
                reply_text(event, "⇈ Press the above link to start the game ⇈")
            else
                reply_text(event, "Unknown command: `#{text}`")
            end
        end
    end

    def reply_text(event, texts)
      texts = [texts] if texts.is_a?(String)
      @client.reply_message(
        event['replyToken'],
        texts.map { |text| {type: 'text', text: text} }
      )
    end

    def reply_content(event, messages)
      res = @client.reply_message(
        event['replyToken'],
        messages
      )
      puts res.read_body if res.code != 200
    end

    def latest_cartridges(event, cartridges)
        columns = cartridges.map do |c|
            {
              title: c.name,
              text: c.description,
              actions: [
                { label: 'Download game ', type: 'message', text: c.url }
              ]
            }
        end

        reply_content(event, {
          type: 'template',
          altText: 'List latest cartridges',
          template: {
            type: 'carousel',
            columns: columns
          }
        })
    end
end