import {Component, ElementRef, EventEmitter, Input, Output, ViewChild, ViewEncapsulation} from '@angular/core';

declare var UIkit: any;

@Component({
  selector: 'modal-alert',
  template: `
    <div #element class="uk-modal" [class.uk-modal-container]="large" [id]="id" uk-modal="container: #modal-container">
      <div class="uk-modal-dialog">
        <div class="uk-modal-header uk-flex uk-flex-middle uk-flex-between" [ngClass]="classTitle">
          <div [class.uk-invisible]="!alertHeader">
            <h5 class="uk-margin-remove">{{alertTitle}}</h5>
          </div>
          <button class="uk-close uk-icon uk-margin-left" (click)="cancel()">
            <icon name="close" ratio="1.5"></icon>
          </button>
        </div>
        <div class="uk-modal-body uk-animation-fast uk-text-left"
             [ngClass]="classBody" [attr.uk-overflow-auto]="overflowBody?'':null">
          <div *ngIf="message" [hidden]=!alertMessage [innerHTML]="message | safeHtml"></div>
          <ng-content></ng-content>
        </div>
        <div *ngIf="choice || okButton || cancelButton" class="uk-modal-footer">
          <div class="uk-grid uk-flex uk-flex-middle" uk-grid>
            <label *ngIf="choice" class="uk-width-expand">
              <input type="checkbox" [(ngModel)]="select">
              <span class="uk-margin-small-left">Don't show this message again</span>
            </label>
            <div [ngClass]="(choice)?'uk-width-auto':'uk-width-1-1'">
              <div *ngIf="alertFooter" class="uk-flex-right uk-grid uk-grid-small" uk-grid>
                <span *ngIf="okButton" [class.uk-flex-last]="!okButtonLeft">
                  <button class="uk-button uk-button-primary" [disabled]="okDisabled"
                          [class.uk-disabled]="okDisabled" (click)="ok()">{{okButtonText}}</button>
                </span>
                <span *ngIf="cancelButton">
                  <button class="uk-button uk-button-default uk-margin-small-left"
                          (click)="cancel()">{{cancelButtonText}}</button>
                </span>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  `,
  encapsulation: ViewEncapsulation.None,
})
/**
 * API to an open alert window.
 */
export class AlertModal {
  private static MODAL_COUNTER: number = 0;

  id: string = "modal";
  @Input() classTitle: string = "uk-background-primary-opacity";
  @Input() classBody: string = "";
  @Input() large: boolean = false;
  @Input() overflowBody: boolean = true;
  /**
   * Caption for the title.
   */
  public alertTitle: string;
  /**
   * Describes if the alert contains Ok Button.
   * The default Ok button will close the alert and emit the callback.
   * Defaults to true.
   */
  public okButton: boolean = true;
  /**
   * Caption for the OK button.
   * Default: Ok
   */
  public okButtonText: string = 'OK';
  /**
   * Describes if the alert contains cancel Button.
   * The default Cancelbutton will close the alert.
   * Defaults to true.
   */
  public cancelButton: boolean = true;
  /**
   * Caption for the Cancel button.
   * Default: Cancel
   */
  public cancelButtonText: string = 'Cancel';
  /**
   * if the alertMessage is true it will show the contentString inside alert body.
   */
  public alertMessage: boolean = true;
  /**
   * Some message/content can be set in message which will be shown in alert body.
   */
  public message: string;
  /**
   * if the value is true alert footer will be visible or else it will be hidden.
   */
  public alertFooter: boolean = true;
  /**
   * shows alert header if the value is true.
   */
  public alertHeader: boolean = true;
  /**
   *  if the value is true ok button align on the left, else on the right
   */
  public okButtonLeft: boolean = true;

  /**
   *  if the value is true ok button is disabled
   */
  @Input()
  public okDisabled: boolean = false;

  /**
   *  If the value is true, a checkbox option will be appeared on the right side of footer
   */
  @Input()
  public choice: boolean = false;

  /**
   * if the value is true then on ok clicked, modal will stay open.
   */
  public stayOpen: boolean = false;

  /**
   *  Value will be emitted if @choice is true
   */
  public select: boolean = true;
  /**
   * Emitted when ok button was clicked
   * or when Ok method is called.
   */
  @Output() public alertOutput: EventEmitter<any> = new EventEmitter();
  /**
   * Emitted when cancel button was clicked
   * or when cancel method is called.
   */
  @Output() public cancelOutput: EventEmitter<any> = new EventEmitter();

  @ViewChild('element') element: ElementRef;

  constructor() {
  }

  ngOnInit() {
    AlertModal.MODAL_COUNTER++;
    this.id = 'modal-' + AlertModal.MODAL_COUNTER;
  }

  ngOnDestroy() {
    if(typeof document !== "undefined") {
      const element = document.getElementById("modal-container");
      for (let i = element.childNodes.length - 1; i >= 0; --i) {
        let child: ChildNode = element.childNodes[i];
        if (child['id'] == this.id) {
          child.remove();
        }
      }
    }
  }

  /**
   * Opens an alert window creating backdrop.
   */
  open() {
    UIkit.modal(this.element.nativeElement).show();
  }

  /**
   *  ok method closes the modal and emits modalOutput.
   */
  ok() {
    if (!this.stayOpen) {
      UIkit.modal(this.element.nativeElement).hide();
    }
    if (!this.choice) {
      this.alertOutput.emit(true);
    } else {
      this.alertOutput.emit({
        value: true,
        choice: this.select
      });
    }
  }

  /**
   *  cancel method closes the modal.
   */
  cancel() {
    UIkit.modal(this.element.nativeElement).hide();
    this.cancelOutput.emit(true);
  }
}