/********************************************************************************
 * Copyright (C) 2019 TypeFox and others.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the Eclipse
 * Public License v. 2.0 are satisfied: GNU General Public License, version 2
 * with the GNU Classpath Exception which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 ********************************************************************************/

import { LocationProgress, ProgressLocationService } from './progress-location-service';
import { Disposable, DisposableCollection } from '@gedit/utils';
import { inject, injectable, postConstruct } from 'inversify';
import { ProgressBarOptions } from './progress-bar-factory';

@injectable()
export class ProgressBar implements Disposable {

  @inject(ProgressLocationService)
  protected readonly progressLocationService: ProgressLocationService;

  @inject(ProgressBarOptions)
  protected readonly options: ProgressBarOptions;

  protected readonly toDispose = new DisposableCollection();
  protected progressBar: HTMLDivElement;
  protected progressBarContainer: HTMLDivElement;

  constructor() {
    this.progressBar = document.createElement('div');
    this.progressBar.className = 'theia-progress-bar';
    this.progressBar.style.display = 'none';
    this.progressBarContainer = document.createElement('div');
    this.progressBarContainer.className = 'theia-progress-bar-container';
    this.progressBarContainer.append(this.progressBar);
  }

  dispose(): void {
    this.toDispose.dispose();
  }

  @postConstruct()
  protected init(): void {
    const {container, insertMode, locationId} = this.options;
    if (insertMode === 'prepend') {
      container.prepend(this.progressBarContainer);
    } else {
      container.append(this.progressBarContainer);
    }
    this.toDispose.push(Disposable.create(() => this.progressBarContainer.remove()));
    const onProgress = this.progressLocationService.onProgress(locationId);
    this.toDispose.push(onProgress(event => this.onProgress(event)));
    const current = this.progressLocationService.getProgress(locationId);
    if (current) {
      this.onProgress(current);
    }
  }

  protected onProgress(event: LocationProgress): void {
    if (this.toDispose.disposed) {
      return;
    }
    this.setVisible(event.show);
  }

  protected setVisible(visible: boolean): void {
    this.progressBar.style.display = visible ? 'block' : 'none';
  }

}