import { Injectable } from '@angular/core';
import {DocumentService} from './document.service';

function getWindow(): Window {
  return window;
}
@Injectable({
  providedIn: 'root'
})
export class WindowService {
  constructor(private documentService: DocumentService) {
  }

  public nativeWindow(): Window | any {
    return getWindow();
  }

  public getXYScroll(): {x: number, y: number } {
    const supportPageOffset = this.nativeWindow().pageXOffset !== undefined;
    const isCSS1Compat = ((this.documentService.nativeDocument().compatMode || '') === 'CSS1Compat');

    const x = supportPageOffset
      ? this.nativeWindow().pageXOffset
      : isCSS1Compat
        ? this.documentService.nativeDocument().documentElement.scrollLeft
        : this.documentService.nativeDocument().body.scrollLeft;

    const y = supportPageOffset
      ? this.nativeWindow().pageYOffset
      : isCSS1Compat
        ? this.documentService.nativeDocument().documentElement.scrollTop
        : this.documentService.nativeDocument().body.scrollTop;

    return {x, y};
  }
}