function onCompositionStart(e: Event) {
  (e.target as any).composing = true;
}

function onCompositionEnd(e: Event) {
  const target = e.target as any;
  if (target.composing) {
    target.composing = false;
    trigger(target, 'input');
  }
}

function trigger(el: HTMLElement, type: string) {
  const e = document.createEvent('HTMLEvents');
  e.initEvent(type, true, true);
  el.dispatchEvent(e);
}

export function addEventListener(
  el: Element,
  event: string,
  handler: EventListener,
  options?: EventListenerOptions,
) {
  el.addEventListener(event, handler, options);
}
const antInput = {
  created(el: Element, binding: { modifiers: { lazy: any } }) {
    if (!binding.modifiers || !binding.modifiers.lazy) {
      addEventListener(el, 'compositionstart', onCompositionStart);
      addEventListener(el, 'compositionend', onCompositionEnd);
      // Safari < 10.2 & UIWebView doesn't fire compositionend when
      // switching focus before confirming composition choice
      // this also fixes the issue where some browsers e.g. iOS Chrome
      // fires "change" instead of "input" on autocomplete.
      addEventListener(el, 'change', onCompositionEnd);
    }
  },
};

export default antInput;