/**
 * Mixin for timer.
 * @mixin ApTimerMixin
 */

'use strict'

import React, {PropTypes as types} from 'react'
import Promise from  'apemanpromise'

/** @lends ApTimerMixin */
let ApTimerMixin = {

  // --------------------
  // Custom
  // --------------------
  $apTimerMixed: true,

  /**
   * Set a timer with name.
   * @param {string} name - Name of the timer.
   * @param {number} duration - Timeout duration.
   * @returns {Promise}
   */
  setTimer (name, duration) {
    const s = this
    return new Promise((resolve) => {
      let id = setTimeout(() => {
        resolve(id)
      }, duration)
      s._timers[ name ] = id
    })
  },

  /**
   * Clear and set timer.
   * @param {string} name - Name of the timer.
   * @param {number} duration - Timeout duration.
   * @returns {Promise}
   */
  resetTimer (name, duration) {
    const s = this

    return s.clearTimer(name)
      .then(
        s.setTimer(name, duration)
      )
  },

  /**
   * Clear a timer with name.
   * @param {string} name - Name of timer.
   * @returns {Promise}
   */
  clearTimer (name) {
    const s = this
    let id
    if (s._timers.hasOwnProperty(name)) {
      id = s._timers[ name ]
      clearTimeout(id)
      delete s._timers[ name ]
    }
    return Promise.resolve(id)
  },

  /**
   * Clear all timers.
   * @returns {Promise}
   */
  clearAllTimers () {
    const s = this
    return Promise.all(
      Object.keys(s._timers || {}).map((name) =>
        s.clearTimer(name)
      )
    )
  },

  // --------------------
  // Lifecycle
  // --------------------

  componentWillMount () {
    const s = this
    s._timers = {}
  },

  componentWillUnmount () {
    const s = this

    s.clearAllTimers()
    delete s._timers
  },

  _timers: undefined

}

export default Object.freeze(ApTimerMixin)