// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import {Overlay} from './common.js';

export class PausedOverlay extends Overlay {
  private container!: HTMLElement;

  constructor(window: Window, style: CSSStyleSheet[] = []) {
    super(window, style);
    this.onKeyDown = this.onKeyDown.bind(this);
  }

  onKeyDown(event: KeyboardEvent) {
    if (event.key === 'F8' || this.eventHasCtrlOrMeta(event) && event.key === '\\') {
      this.window.InspectorOverlayHost.send('resume');
    } else if (event.key === 'F10' || this.eventHasCtrlOrMeta(event) && event.key === '\'') {
      this.window.InspectorOverlayHost.send('stepOver');
    }
  }

  install() {
    const controlsLine = this.document.createElement('div');
    controlsLine.classList.add('controls-line');

    const messageBox = this.document.createElement('div');
    messageBox.classList.add('message-box');
    const pausedInDebugger = this.document.createElement('div');
    pausedInDebugger.id = 'paused-in-debugger';
    this.container = pausedInDebugger;
    messageBox.append(pausedInDebugger);
    controlsLine.append(messageBox);

    const resumeButton = this.document.createElement('div');
    resumeButton.id = 'resume-button';
    resumeButton.title = 'Resume script execution (F8).';
    resumeButton.classList.add('button');
    const glyph = this.document.createElement('div');
    glyph.classList.add('glyph');
    resumeButton.append(glyph);
    controlsLine.append(resumeButton);

    const stepOverButton = this.document.createElement('div');
    stepOverButton.id = 'step-over-button';
    stepOverButton.title = 'Step over next function call (F10).';
    stepOverButton.classList.add('button');
    const glyph2 = this.document.createElement('div');
    glyph2.classList.add('glyph');
    stepOverButton.append(glyph2);
    controlsLine.append(stepOverButton);

    this.document.body.append(controlsLine);

    this.document.addEventListener('keydown', this.onKeyDown);

    resumeButton.addEventListener('click', () => this.window.InspectorOverlayHost.send('resume'));
    stepOverButton.addEventListener('click', () => this.window.InspectorOverlayHost.send('stepOver'));

    super.install();
  }

  uninstall() {
    this.document.body.innerHTML = '';
    this.document.removeEventListener('keydown', this.onKeyDown);
    super.uninstall();
  }

  drawPausedInDebuggerMessage(message: string) {
    this.container.textContent = message;
  }
}