const axios = require('axios')
const config = require('../../config')
const client = axios.create({
  baseURL: 'https://api.twitch.tv/helix',
  headers: {
    'Client-ID': config.twitch.clientid
  }
})
const querystring = require('querystring')

/**
 * get twitch user id by login name
 * @param {string} name login name
 */
const getUserIDByName = async (name = '') => {
  if (typeof name !== 'string' || name.trim().length === 0) return null
  name = name.trim()
  let url = '/users'
  let params = {
    login: name
  }
  let res = await client({
    url,
    method: 'get',
    params
  })
  if (!('data' in res) || !('data' in res.data) || !Array.isArray(res.data.data) || res.data.data.length === 0) return null
  let userInfo = res.data.data[0]
  if (!('id' in userInfo) || !('login' in userInfo)) return null
  return {
    id: userInfo.id,
    login: userInfo.login
  }
}

const registerWebHook = async (uid = '', type = null) => {
  if (!typeof uid === 'string' || uid.trim().length === 0) return null
  uid = uid.trim()
  let topic = null
  switch (type) {
    case 'live':
      topic = `https://api.twitch.tv/helix/streams?user_id=${encodeURIComponent(uid)}`
      break
  }
  if (topic === null) return null
  let url = '/webhooks/hub'
  let data = {
    'hub.mode': 'subscribe',
    'hub.topic': topic,
    'hub.callback': `${config.url.replace(/\/$/, '')}/twitch/webhook?uid=${encodeURIComponent(uid)}&type=${encodeURIComponent(type)}`,
    'hub.lease_seconds': 864000,
    'hub.secret': config.twitch.subsecret
  }
  try {
    await client({
      method: 'post',
      data,
      url
    })
  } catch (err) {
    console.log(err)
  }
  return null
}

const getUserStream = async (uids = []) => {
  if (!uids || !Array.isArray(uids) || uids.length === 0) return null
  let res = []
  while (uids.length > 0) {
    let tmp = uids.splice(0, 50)
    let url = '/streams'
    let params = {
      user_id: [...tmp]
    }
    try {
      let result = await client({
        method: 'get',
        url,
        params,
        paramsSerializer: function (params) {
          return querystring.stringify(params)
        }
      })
      if (!('data' in result) || !('data' in result.data)) continue
      res = [...result.data.data]
    } catch (err) {
      console.log(err)
    }
  }

  return res
}

module.exports = {
  registerWebHook,
  getUserIDByName,
  getUserStream
}