const Memcached = require('memcached')

class MemcachedLib {
  constructor () {
    this._host = ''
    this._port = ''
    this._expire = 86400
    this._conn = null
  }

  connect () {
    this._conn = new Memcached(`${this._host}:${this._port}`)
  }

    /**
     * set object to memcached
     * @param {string} key
     * @param {string} val
     * @param {number} expire
     */
  async setVal (key, val, expire = this._expire) {
    return new Promise((resolve, reject) => {
      this._conn.set(key, val, expire, err => {
        if (err) return reject(err)
        return resolve(null)
      })
    })
  }

    /**
     * get object from memcached
     * @param {string} key
     */
  async getVal (key) {
    return new Promise((resolve, reject) => {
      this._conn.get(key, (err, data) => {
        if (err) return reject(err)
        return resolve(data)
      })
    })
  }

  set host (str) { this._host = str }
  set port (str) { this._port = str }
  set expire (str) { this._expire = str }
}

module.exports = new MemcachedLib()