// Polymer legacy event helpers used courtesy of the Polymer project.
//
// Copyright (c) 2017 The Polymer Authors. All rights reserved.
//
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// modification, are permitted provided that the following conditions are
// met:
//
//    * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
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// in the documentation and/or other materials provided with the
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declare global {
  interface HASSDomEvents {}
}

export type ValidHassDomEvent = keyof HASSDomEvents;

export interface HASSDomEvent<T> extends Event {
  detail: T;
}

/**
 * Dispatches a custom event with an optional detail value.
 *
 * @param {string} type Name of event type.
 * @param {*=} detail Detail value containing event-specific
 *   payload.
 * @param {{ bubbles: (boolean|undefined),
 *           cancelable: (boolean|undefined),
 *           composed: (boolean|undefined) }=}
 *  options Object specifying options.  These may include:
 *  `bubbles` (boolean, defaults to `true`),
 *  `cancelable` (boolean, defaults to false), and
 *  `node` on which to fire the event (HTMLElement, defaults to `this`).
 * @return {Event} The new event that was fired.
 */
export const fireEvent = <HassEvent extends ValidHassDomEvent>(
  node: HTMLElement | Window,
  type: HassEvent,
  detail?: HASSDomEvents[HassEvent],
  options?: {
    bubbles?: boolean;
    cancelable?: boolean;
    composed?: boolean;
  }
) => {
  options = options || {};
  // @ts-ignore
  detail = detail === null || detail === undefined ? {} : detail;
  const event = new Event(type, {
    bubbles: options.bubbles === undefined ? true : options.bubbles,
    cancelable: Boolean(options.cancelable),
    composed: options.composed === undefined ? true : options.composed,
  });
  (event as any).detail = detail;
  node.dispatchEvent(event);
  return event;
};
