/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {DOCUMENT} from '@angular/common';
import {Inject, Injectable, ɵɵinject} from '@angular/core';

import {getDOM} from '../dom/dom_adapter';

/**
 * Factory to create Title service.
 */
export function createTitle() {
  return new Title(ɵɵinject(DOCUMENT));
}

/**
 * A service that can be used to get and set the title of a current HTML document.
 *
 * Since an Angular application can't be bootstrapped on the entire HTML document (`<html>` tag)
 * it is not possible to bind to the `text` property of the `HTMLTitleElement` elements
 * (representing the `<title>` tag). Instead, this service can be used to set and get the current
 * title value.
 *
 * @publicApi
 */
@Injectable({providedIn: 'root', useFactory: createTitle, deps: []})
export class Title {
  constructor(@Inject(DOCUMENT) private _doc: any) {}
  /**
   * Get the title of the current HTML document.
   */
  getTitle(): string { return getDOM().getTitle(this._doc); }

  /**
   * Set the title of the current HTML document.
   * @param newTitle
   */
  setTitle(newTitle: string) { getDOM().setTitle(this._doc, newTitle); }
}
