const axios = require('axios')
const config = require('@config/index')

const client = axios.create({
  baseURL: 'https://api.line.me/v2/bot',
  headers: {
    Authorization: `Bearer ${config.line.access}`
  }
})

/**
 * push message to group or room or user
 * @param {string} target target id (groupid, userid, roomid)
 * @param {string} message push message
 */
const pushMessage = async (target, message = '') => {
  if (typeof target !== 'string' || target.trim().length === 0) return
  if (typeof message !== 'string' || message.trim().length === 0) return

  let data = {
    to: target,
    messages: [
      {
        type: 'text',
        text: message
      }
    ]
  }

  let opts = {
    method: 'post',
    url: '/message/push',
    data
  }

  await client(opts)
}

const textObject = (txt = '') => {
  if (typeof txt !== 'string' || txt.trim().length === 0) return null
  return {
    type: 'text',
    text: txt
  }
}

const imageObject = (txt = '') => {
  if (typeof txt !== 'string' || txt.trim().length === 0) return null
  txt = txt.split(';')
  return {
    type: 'image',
    originalContentUrl: txt[0],
    previewImageUrl: txt[1]
  }
}

/**
 * send reply message
 * @param {string} replyToken line message reply token
 * @param {string} message reply message
 */
const replyMessage = async (replyToken, message) => {
  let url = '/message/reply'

  let regex = /^\$(.+?)\$/
  let m = message.match(regex)
  let obj = null
  message = message.replace(/^\$.+?\$/, '')
  if (m !== null && m.length > 1) {
    switch (m[1]) {
      case 'image':
        obj = imageObject(message)
        break
      case 'text':
        obj = textObject(message)
        break
      default:
        obj = textObject(message)
    }
  }

  if (obj !== null) {
    let opts = {
      method: 'post',
      url,
      data: {
        replyToken,
        messages: [obj]
      }
    }

    await client(opts)
  }
}

module.exports = {
  pushMessage,
  replyMessage
}