/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import { GlobalPointerMoveMonitor } from './globalPointerMoveMonitor';
import { Widget } from './widget';
import { TimeoutTimer } from '../../common/Async';
import * as dom from '../Dom';

export interface IScrollbarArrowOptions {
  handleActivate: () => void;
  className: string;
  // icon: ThemeIcon;

  bgWidth: number;
  bgHeight: number;

  top?: number;
  left?: number;
  bottom?: number;
  right?: number;
}

export class ScrollbarArrow extends Widget {

  private _handleActivate: () => void;
  public bgDomNode: HTMLElement;
  public domNode: HTMLElement;
  private _pointerdownRepeatTimer: dom.WindowIntervalTimer;
  private _pointerdownScheduleRepeatTimer: TimeoutTimer;
  private _pointerMoveMonitor: GlobalPointerMoveMonitor;

  constructor(opts: IScrollbarArrowOptions) {
    super();
    this._handleActivate = opts.handleActivate;

    this.bgDomNode = document.createElement('div');
    this.bgDomNode.className = 'xterm-arrow-background';
    this.bgDomNode.style.position = 'absolute';
    this.bgDomNode.style.width = opts.bgWidth + 'px';
    this.bgDomNode.style.height = opts.bgHeight + 'px';
    if (typeof opts.top !== 'undefined') {
      this.bgDomNode.style.top = '0px';
    }
    if (typeof opts.left !== 'undefined') {
      this.bgDomNode.style.left = '0px';
    }
    if (typeof opts.bottom !== 'undefined') {
      this.bgDomNode.style.bottom = '0px';
    }
    if (typeof opts.right !== 'undefined') {
      this.bgDomNode.style.right = '0px';
    }

    this.domNode = document.createElement('div');
    this.domNode.className = opts.className;
    // this.domNode.classList.add(...ThemeIcon.asClassNameArray(opts.icon));

    this.domNode.style.position = 'absolute';
    const arrowSize = Math.min(opts.bgWidth, opts.bgHeight);
    this.domNode.style.width = arrowSize + 'px';
    this.domNode.style.height = arrowSize + 'px';
    if (typeof opts.top !== 'undefined') {
      this.domNode.style.top = opts.top + 'px';
    }
    if (typeof opts.left !== 'undefined') {
      this.domNode.style.left = opts.left + 'px';
    }
    if (typeof opts.bottom !== 'undefined') {
      this.domNode.style.bottom = opts.bottom + 'px';
    }
    if (typeof opts.right !== 'undefined') {
      this.domNode.style.right = opts.right + 'px';
    }

    this._pointerMoveMonitor = this._register(new GlobalPointerMoveMonitor());
    this._register(dom.addStandardDisposableListener(this.bgDomNode, dom.eventType.POINTER_DOWN, (e) => this._arrowPointerDown(e)));
    this._register(dom.addStandardDisposableListener(this.domNode, dom.eventType.POINTER_DOWN, (e) => this._arrowPointerDown(e)));

    this._pointerdownRepeatTimer = this._register(new dom.WindowIntervalTimer());
    this._pointerdownScheduleRepeatTimer = this._register(new TimeoutTimer());
  }

  private _arrowPointerDown(e: PointerEvent): void {
    if (!e.target || !(e.target instanceof Element)) {
      return;
    }
    const scheduleRepeater = (): void => {
      this._pointerdownRepeatTimer.cancelAndSet(() => this._handleActivate(), 1000 / 24, dom.getWindow(e));
    };

    this._handleActivate();
    this._pointerdownRepeatTimer.cancel();
    this._pointerdownScheduleRepeatTimer.cancelAndSet(scheduleRepeater, 200);

    this._pointerMoveMonitor.startMonitoring(
      e.target,
      e.pointerId,
      e.buttons,
      (pointerMoveData) => { /* Intentional empty */ },
      () => {
        this._pointerdownRepeatTimer.cancel();
        this._pointerdownScheduleRepeatTimer.cancel();
      }
    );

    e.preventDefault();
  }
}