const fbTemplate = require('claudia-bot-builder/lib/facebook/format-message')
const fbReply = require('claudia-bot-builder/lib/facebook/reply')

const normalize = str => str.toLowerCase()

const send = (recipientId, message) =>
  fbReply(recipientId, message, process.env.FB_ACCESS_TOKEN)

const intents = {
  default: {
    keywords: [],
    run(msg, recipient) {
      const reply = new fbTemplate.Text(
        `Sorry, ${
          recipient.first_name
        }. I am a young Bot and still learning. Type "Start" to show the start over.`
      ).get()
      send(recipient.id, reply)
    },
  },
  start: {
    keywords: ['start', 'menu', 'help'],
    run(msg, recipient) {
      const reply = new fbTemplate.Text(`
      This is your menu. You can reach it by writing Menu, or Help, or Start
      `).get()
      send(recipient.id, reply)
    },
  },
  drink: {
    keywords: ['dring', 'water', 'gimmme'],
    run(msg, recipient) {
      const reply = new fbTemplate.Text(`
    So, you'd like to drink?
    `).get()
      send(recipient.id, reply)
    },
  },
}

const getIntent = msg =>
  Object.keys(intents).find(k => intents[k].keywords.indexOf(msg) !== -1)

module.exports = async (message, recipient) => {
  const intent = getIntent(normalize(message.text))

  // Fallthrough
  if (!intent) {
    return intents.default.run(message, recipient)
  }

  intents[intent].run(message, recipient)
}