import {
  XCardAction,
  XCardActionModel,
  XCardContainerComponent,
} from './x-card.typings';
import { Subject, Subscription } from 'rxjs';
import { concatMap, map } from 'rxjs/operators';
import { XSizeModel } from '../classes/x-size.model.';
import { nameof, isNullOrEmptyString, isNullOrUndefined } from 'x-framework-core';
import { Component, ChangeDetectionStrategy, ElementRef, ViewChild } from '@angular/core';

@Component({
  // tslint:disable-next-line:component-selector
  selector: 'x-card',
  templateUrl: './x-card.component.html',
  styleUrls: ['./x-card.component.scss'],
  changeDetection: ChangeDetectionStrategy.OnPush,
})
export class XCardComponent extends XCardContainerComponent {
  //
  //#region Props ...
  //
  private ACTION_PROVIDER_SUBSCRIPTION: Subscription;

  //
  //#region Card Elements ....
  private CARD_IMAGE: ElementRef<HTMLElement> = undefined;
  private CARD_HEADER: ElementRef<HTMLElement> = undefined;
  private CARD_FOOTER: ElementRef<HTMLElement> = undefined;
  private CARD_CONTENT: ElementRef<HTMLElement> = undefined;
  private CARD_ACTIONS: ElementRef<HTMLElement> = undefined;

  @ViewChild('cardImage', { static: false })
  set cardImage(v: ElementRef<HTMLElement>) {
    this.CARD_IMAGE = v;
  }

  @ViewChild('cardHeader', { static: false })
  set cardHeader(v: ElementRef<HTMLElement>) {
    this.CARD_HEADER = v;
  }

  @ViewChild('cardFooter', { static: false })
  set cardFooter(v: ElementRef<HTMLElement>) {
    this.CARD_FOOTER = v;
  }

  @ViewChild('cardContent', { static: false })
  set cardContent(v: ElementRef<HTMLElement>) {
    this.CARD_CONTENT = v;
  }

  @ViewChild('cardActions', { static: false })
  set cardActions(v: ElementRef<HTMLElement>) {
    this.CARD_ACTIONS = v;
  }

  get cardImage() {
    return this.CARD_IMAGE;
  }

  get cardHeader() {
    return this.CARD_HEADER;
  }

  get cardFooter() {
    return this.CARD_FOOTER;
  }

  get cardContent() {
    return this.CARD_CONTENT;
  }

  get cardActions() {
    return this.CARD_ACTIONS;
  }
  //#endregion 

  //
  //#region Full Screen ...
  private IS_FULLSCREEN: boolean = false;
  set isFullscreen(v: boolean) {
    //
    const isChanged = v != this.IS_FULLSCREEN;

    //
    this.IS_FULLSCREEN = v;
  }
  get isFullscreen() {
    return this.IS_FULLSCREEN;
  }
  //#endregion
  //#endregion

  //
  //#region LifeCycles ...
  onInit() {
    super.onInit();

    //
    // Listen for fullscreen change events (handles ESC key and browser UI)
    document.addEventListener('fullscreenchange', this.fullscreenChangeHandler);
    document.addEventListener('webkitfullscreenchange', this.fullscreenChangeHandler);
    document.addEventListener('mozfullscreenchange', this.fullscreenChangeHandler);
    document.addEventListener('MSFullscreenChange', this.fullscreenChangeHandler);
  }

  onChange(changeKeys: string[]) {
    super.onChange(changeKeys);

    //
    //#region Action Provider Changed ...
    //
    const isActionProviderChanged = changeKeys.includes(
      nameof<XCardComponent>('actionProvider'),
    );
    if (isActionProviderChanged) {
      this.registerActionProvider();
    }
    //#endregion
  }

  onDestroy() {
    super.onDestroy();

    //
    this.unregisterActionProvider();

    //
    document.removeEventListener('fullscreenchange', this.fullscreenChangeHandler);
    document.removeEventListener('webkitfullscreenchange', this.fullscreenChangeHandler);
    document.removeEventListener('mozfullscreenchange', this.fullscreenChangeHandler);
    document.removeEventListener('MSFullscreenChange', this.fullscreenChangeHandler);
  }

  registerViewHandlers() {
    super.registerViewHandlers();

    //
    this.registerActionProvider();
  }
  //#endregion

  //
  //#region UI Providers ...
  isNoTextCard() {
    return this.getResourceValue(this.title).pipe(
      concatMap((title) =>
        this.getResourceValue(this.subTitle).pipe(
          map((subTitle) => {
            return {
              title,
              subTitle,
            };
          }),
          map((object) => {
            return (
              isNullOrEmptyString(object.title) &&
              isNullOrEmptyString(object.subTitle)
            );
          }),
        ),
      ),
    );
  }
  //#endregion

  //
  //#region Actions ...
  public async enterFullscreen(options?: FullscreenOptions) {
    //
    if (this.isFullscreen) {
      return;
    }

    //
    const element: HTMLElement = this.element?.nativeElement;
    if (!element) {
      return;
    }

    //
    try {
      //
      if (!this.canUseFullscreen()) {
        return;
      }

      //
      await element.requestFullscreen(options);

      //
      this.isFullscreen = true;
      this.detectChanges();
    } catch { }
  }

  public async exitFullscreen() {
    //
    if (!this.isFullscreen) {
      return;
    }

    //
    try {
      //
      if (document.fullscreenElement) {
        await document.exitFullscreen();
      }

      //
      this.isFullscreen = false;
      this.detectChanges();
    } catch { }
  }

  public async toggleFullscreen() {
    //
    if (this.isFullscreen) {
      await this.exitFullscreen();
    } else {
      await this.enterFullscreen();
    }
  }

  //
  //#region Size Calculating ...
  public calculateImageSize() {
    //
    let result: XSizeModel = undefined;

    //
    // Validate ...
    if (isNullOrUndefined(this.CARD_IMAGE) || isNullOrUndefined(this.CARD_IMAGE.nativeElement)) {
      return result;
    }

    //
    result = {
      width: this.CARD_IMAGE.nativeElement.offsetWidth,
      height: this.CARD_IMAGE.nativeElement.offsetHeight
    };

    //
    return result;
  }

  public calculateHeaderSize() {
    //
    let result: XSizeModel = undefined;

    //
    // Validate ...
    if (isNullOrUndefined(this.CARD_HEADER) || isNullOrUndefined(this.CARD_HEADER.nativeElement)) {
      return result;
    }

    //
    result = {
      width: this.CARD_HEADER.nativeElement.offsetWidth,
      height: this.CARD_HEADER.nativeElement.offsetHeight
    };

    //
    return result;
  }

  public calculateFooterSize() {
    //
    let result: XSizeModel = undefined;

    //
    // Validate ...
    if (isNullOrUndefined(this.CARD_FOOTER) || isNullOrUndefined(this.CARD_FOOTER.nativeElement)) {
      return result;
    }

    //
    result = {
      width: this.CARD_FOOTER.nativeElement.offsetWidth,
      height: this.CARD_FOOTER.nativeElement.offsetHeight
    };

    //
    return result;
  }

  public calculateContentSize() {
    //
    let result: XSizeModel = undefined;

    //
    // Validate ...
    if (isNullOrUndefined(this.CARD_CONTENT) || isNullOrUndefined(this.CARD_CONTENT.nativeElement)) {
      return result;
    }

    //
    result = {
      width: this.CARD_CONTENT.nativeElement.offsetWidth,
      height: this.CARD_CONTENT.nativeElement.offsetHeight
    };

    //
    return result;
  }

  public calculateActionsSize() {
    //
    let result: XSizeModel = undefined;

    //
    // Validate ...
    if (isNullOrUndefined(this.CARD_ACTIONS) || isNullOrUndefined(this.CARD_ACTIONS.nativeElement)) {
      return result;
    }

    //
    result = {
      width: this.CARD_ACTIONS.nativeElement.offsetWidth,
      height: this.CARD_ACTIONS.nativeElement.offsetHeight
    };

    //
    return result;
  }
  //#endregion
  //#endregion

  //
  //#region Private ...
  //
  //#region ActionProvider ...
  private registerActionProvider() {
    //
    this.unregisterActionProvider();

    //
    if (!this.actionProvider) {
      this.actionProvider = new Subject<XCardActionModel>();
    }

    //
    // Handle Action Provider ...
    this.ACTION_PROVIDER_SUBSCRIPTION = this.applyTakeUntilWrapper(
      this.actionProvider.asObservable(),
    ).subscribe(async (model) => {
      //
      if (!model) {
        return;
      }

      //
      switch (model.action) {
        //
        case XCardAction.Refresh:
          this.detectChanges();
          break;

        //
        case XCardAction.EnterFullScreen:
          await this.enterFullscreen();
          break;

        //
        case XCardAction.ExitFullScreen:
          await this.exitFullscreen();
          break;

        //
        case XCardAction.ToggleFullScreen:
          await this.toggleFullscreen();
          break;
      }
    });
  }

  private unregisterActionProvider() {
    //
    if (!this.ACTION_PROVIDER_SUBSCRIPTION) {
      return;
    }

    //
    this.ACTION_PROVIDER_SUBSCRIPTION.unsubscribe();
    this.ACTION_PROVIDER_SUBSCRIPTION = null;
  }
  //#endregion

  //
  //#region Fullscreen ...
  private fullscreenChangeHandler = () => {
    //
    const isFullscreen = !!(
      document.fullscreenElement ||
      (document as any).webkitFullscreenElement ||
      (document as any).mozFullScreenElement ||
      (document as any).msFullscreenElement
    );

    //
    this.isFullscreen = isFullscreen;
    this.detectChanges();
  };

  private canUseFullscreen(): boolean {
    return !!(
      document.fullscreenEnabled ||
      (document as any).webkitFullscreenEnabled ||
      (document as any).mozFullScreenEnabled ||
      (document as any).msFullscreenEnabled
    );
  }
  //#endregion
  //#endregion
}