import { LitElement, property, html, customElement, TemplateResult } from 'lit-element';

import { WccDefaultElement } from './wcc-defaultelement';

// wcc tools
import './wcc-frame';
import './wcc-sidebar';
import './wcc-properties';

@customElement('wcc-dashboard')
export class WccDashboard extends LitElement {
  @property()
  public selectedItem: TemplateResult | LitElement = WccDefaultElement as any;

  @property()
  public selectedInstance;

  @property()
  public selectedViewport: string = 'desktop';

  @property()
  public pages: TemplateResult[] = [];

  @property()
  public elements: LitElement[] = [];

  constructor() {
    super();
  }

  public render(): TemplateResult {
    return html`
      <style>
        @import url('https://fonts.googleapis.com/css?family=Roboto');
        :host {
          font-family: 'Roboto', sans-serif;
          background: #fcfcfc;
          display: block;
          box-sizing: border-box;
        }
        :host([hidden]) {
          display: none;
        }
      </style>
      <wcc-sidebar .pages=${this.pages} .elements=${this.elements} @selectedItem=${eventArg => {
        this.selectedItem = eventArg.detail;
      }}></wcc-sidebar>
      <wcc-properties .selectedItem=${this.selectedItem} .selectedInstance=${this.selectedInstance} @selectedViewport=${eventArg => {this.selectedViewport = eventArg.detail; this.updateSlot();}}></wcc-properties>
      <wcc-frame id="wccFrame" viewport=${this.selectedViewport}>
        ${(() => {
          if (this.selectedItem instanceof TemplateResult) {
            return this.selectedItem;
          } else if (this.selectedItem) {
            console.log(this.selectedItem);
            const anonItem: any = this.selectedItem;
            if (anonItem.demo) {
              return html`${anonItem.demo}`;
            } else {
              alert(`component does not expose a demo property.`);
            }
          } else {

          }
        })()}
      </wcc-frame>
      ${this.selectedViewport}
    `;
  }

  public updateSlot() {
    console.log('updateSlot');
    const oldSelectedItem = this.selectedItem;
    this.selectedItem = null;
    setTimeout(() => {
      this.selectedItem = oldSelectedItem;
    }, 0);
  }


}