export function popupWindowOptions(width, height) {
  const s = window.screen;
  const opt = {
    width:      Math.min(s.width, width || 1040),
    height:     Math.min(s.height, height || 768),
    resizable:  1,
    scrollbars: 1,
  };

  opt.left = Math.max(0, (s.width - opt.width) / 2);
  opt.top = Math.max(0, (s.height - opt.height) / 2);

  const optStr = Object.keys(opt).map((k) => {
    return `${ k }=${ opt[k] }`;
  }).join(',');

  return optStr;
}

export function open(url, name = '_blank', opt = '') {
  return window.open(url, name, opt);
}

export class Popup {
  constructor(onOpen = () => {}, onClose = () => {}) {
    this.onOpen = onOpen;
    this.onClose = onClose;
    this.popup = null;
  }

  open(url, name, opt) {
    this.onOpen();
    this.popup = open(url, name, opt);

    if (!this.popup) {
      throw new Error('Please disable your popup blocker for this site');
    }

    const timer = setInterval(() => {
      if (this.popup.closed) {
        clearInterval(timer);
        this.onClose();
      }
    }, 500);
  }
}