/**
 * Set and convert the expiration time, return the time in seconds
 *
 * @param expire setting expire time parameters, support `number` or `string+format` (s/m/h/d)
 * @example
 * convertExpire('10s') // 10 seconds
 * convertExpire('10m') // 10 minutes
 * convertExpire('10h') // 10 hours
 * convertExpire('10d') // 10 days
 * convertExpire(30 * 1000) // 30 seconds
 * @return expires time in seconds
 */
export function convertExpire(expire: number | string): number {
  if (!expire) return 0;
  if (expire === -1) return -1;
  if (expire > 0) return expire as number;

  const matches = (expire as string).match(/^(\d+)([smhd])$/);

  if (!matches) return 0;

  const [, t, type] = matches as [any, number, string];

  switch (type) {
    case 'm':
      return t * 60 * 1000;
    case 'h':
      return t * 60 * 60 * 1000;
    case 'd':
      return t * 24 * 60 * 60 * 1000;
    case 's':
    default:
      return t * 1000;
  }
}

export const formatTime = (date: Date) => {
  const year = date.getFullYear();
  const month = date.getMonth() + 1;
  const day = date.getDate();
  const hour = date.getHours();
  const minute = date.getMinutes();
  const second = date.getSeconds();

  return `${[year, month, day].map(formatNumber).join('/')} ${[hour, minute, second]
    .map(formatNumber)
    .join(':')}`;
};

const formatNumber = (n: number) => {
  const s = n.toString();
  return s[1] ? s : `0${s}`;
};

/**
 * 获取当前页面中，选择器为 selector 的第一个node节点
 * @param {String} selector 符合微信小程序规范的选择器
 * @param {Object} context 调用环境，普通页面中为wx，自定义组件中为this；默认值为wx.
 * @return {Array} 返回一个数组，第一个元素为 node 节点
 */
export const querySelector = function (selector: string, context = wx) {
  return new Promise((resolve, reject) => {
    context
      .createSelectorQuery()
      .select(selector)
      .boundingClientRect((res) => {
        if (res) {
          resolve(res);
        } else {
          reject(`不存在选择器为 ${selector} 的wxml`);
        }
      })
      .exec();
  });
};


/**
 * 限制函数的最大执行频率（两次执行间隔不能小于delay时间）
 * @param func 要执行的函数
 * @param delay 延时时间，单位 ms
 * @param params 函数需要的参数
 */
export function throttle(func: Function | ((context: any, params: any) => any), delay: number) {
  let timer: any;
  let lastTime = 0;
  return function (context: any, params: any) {
    if (timer) {
      clearTimeout(timer);
    }
    const now = Date.now();
    const remainTime = delay - (now - lastTime);
    timer = setTimeout(
      () => {
        lastTime = now;
        func(context, params);
      },
      remainTime > 0 ? remainTime : 0,
    );
  };
}