const utils = require('./utils');

class Cond {

  constructor() {
    this.notifyCount = 0;
    this.resolve = null;
    this.timer = null;
  }

  async wait(timeout) {
    return new Promise(function (resolve) {
      if (this.notifyCount > 0) {
        resolve();
        this.reset();
        return;
      }
      this.resolve = resolve;
      this.timer = setTimeout(function () {
        resolve();
        this.reset();
      }.bind(this), timeout);
    }.bind(this));
  }

  notifyAll() {
    if (this.timer != null && this.resolve) {
      clearTimeout(this.timer());
      this.resolve();
      this.reset();
    } else {
      ++this.notifyCount;
    }
  }

  reset() {
    this.notifyCount = 0;
    this.resolve = null;
    this.timer = null;
  }

};

exports.Cond = Cond;