import {Component, EventEmitter, Input, OnDestroy, OnInit, Output, ViewContainerRef} from "@angular/core";
import {LoaderSize} from "./models/loader-size.model";
import {LoaderService} from "./custom-loader.service";

@Component({
  selector: "custom-loader",
  templateUrl: './custom-loader.component.html',
  styleUrls: ['./custom-loader.component.scss']

})

export class LoaderComponent implements OnInit, OnDestroy {
  @Input() active: number;
  @Input() size?: LoaderSize;
  @Input() global?: boolean;
  @Input() name?: string;
  @Input() testId: string;
  @Input() relative: boolean;
  @Output() activeChange: EventEmitter<number> = new EventEmitter<number>();
  private offset : {
    top: string;
    left: string;
    width: string;
    height: string;
  };

  constructor(private loaderService: LoaderService, private viewContainerRef: ViewContainerRef) {
    this.active = 0;
    this.size = LoaderSize.large;
    this.global = false;
  }

  public ngOnInit(): void {
    if (this.name !== undefined) {
      this.loaderService.register(this.name, this);
    }
    this.setLoaderPlace();
  }

  public ngOnDestroy(): void {
    if (this.name !== undefined) {
      this.loaderService.unregister(this.name);
    }
  }

  public activate() {
    this.active++;
    this.activeChange.emit(this.active);
  }

  public deactivate() {
    if (this.active > 0) {
      this.active--;
      this.activeChange.emit(this.active);
    }
  }
  public setLoaderPlace = () => {
    if (this.relative === true) {
      let parentElement = this.viewContainerRef.element.nativeElement.parentElement;
      this.offset = {
        left: (parentElement.offsetLeft !== undefined) ? parentElement.offsetLeft + "px" : undefined,
        top: (parentElement.offsetTop !== undefined) ? parentElement.offsetTop + "px" : undefined,
        width: (parentElement.offsetWidth !== undefined) ? parentElement.offsetWidth + "px" : undefined,
        height: (parentElement.offsetHeight !== undefined) ? parentElement.offsetHeight + "px" : undefined
      };
    } else {
      this.offset = {
        left: '0px',
        top: '0px',
        width: '100%',
        height: '100%'
      }
    }
  }

}