import crypto from 'crypto'

/**
 * @param {Function} func
 * @param {number} wait
 * @param {boolean} immediate
 * @return {*}
 */
export function debounce (func, wait, immediate) {
  let timeout, args, context, timestamp, result

  const later = function () {
    // 据上一次触发时间间隔
    const last = +new Date() - timestamp

    // 上次被包装函数被调用时间间隔 last 小于设定时间间隔 wait
    if (last < wait && last > 0) {
      timeout = setTimeout(later, wait - last)
    } else {
      timeout = null
      // 如果设定为immediate===true，因为开始边界已经调用过了此处无需调用
      if (!immediate) {
        result = func.apply(context, args)
        if (!timeout) context = args = null
      }
    }
  }

  return function (...args) {
    context = this
    timestamp = +new Date()
    const callNow = immediate && !timeout
    // 如果延时不存在，重新设定延时
    if (!timeout) timeout = setTimeout(later, wait)
    if (callNow) {
      result = func.apply(context, args)
      context = args = null
    }

    return result
  }
}

export function rsaEncryptStr (publicKey, text) {
  let pubKey = '-----BEGIN PUBLIC KEY-----' + publicKey + '-----END PUBLIC KEY-----'
  let bufferText = Buffer.from(text, 'utf8')
  return crypto.publicEncrypt({ key: pubKey, padding: crypto.constants.RSA_PKCS1_PADDING }, bufferText).toString('base64')
}

export function formatSeconds (theTime) {
  let theTime1 = 0
  let theTime2 = 0
  if (theTime > 60) {
    theTime1 = parseInt(theTime / 60)
    theTime = parseInt(theTime % 60)
    if (theTime1 > 60) {
      theTime2 = parseInt(theTime1 / 60)
      theTime1 = parseInt(theTime1 % 60)
    }
  }
  let result = '' + parseInt(theTime) + '秒'
  if (theTime1 > 0) {
    result = '' + parseInt(theTime1) + '分' + result
  }
  if (theTime2 > 0) {
    result = '' + parseInt(theTime2) + '小时' + result
  }
  return result
}