import { CSSResultGroup, LitElement, TemplateResult, html, unsafeCSS } from 'lit';
import { customElement, property } from 'lit/decorators.js';
import { classMap } from 'lit/directives/class-map.js';

import { NextPreviousControlConfig } from '../types.js';

import controlStyle from '../scss/next-previous-control.scss';

@customElement('frigate-card-next-previous-control')
export class FrigateCardNextPreviousControl extends LitElement {
  @property({ attribute: false })
  public direction?: 'next' | 'previous';

  @property({ attribute: false })
  set controlConfig(controlConfig: NextPreviousControlConfig | undefined) {
    if (controlConfig?.size) {
      this.style.setProperty('--frigate-card-next-prev-size', controlConfig.size);
    }
    this._controlConfig = controlConfig;
  }
  protected _controlConfig?: NextPreviousControlConfig;

  @property({ attribute: false })
  public thumbnail?: string;

  @property({ attribute: false })
  public icon?: string;

  @property({ attribute: true, type: Boolean })
  public disabled = false;

  protected render(): TemplateResult {
    if (this.disabled || !this._controlConfig || this._controlConfig.style == 'none') {
      return html``;
    }

    const classes = {
      controls: true,
      previous: this.direction == 'previous',
      next: this.direction == 'next',
      thumbnails: this._controlConfig.style == 'thumbnails',
      icons: ['chevrons', 'icons'].includes(this._controlConfig.style),
      button: ['chevrons', 'icons'].includes(this._controlConfig.style),
    };

    if (['chevrons', 'icons'].includes(this._controlConfig.style)) {
      let icon: string;
      if (this._controlConfig.style === 'chevrons') {
       icon = this.direction == 'previous' ? 'mdi:chevron-left' : 'mdi:chevron-right';
      } else {
        if (!this.icon) {
          return html``;
        }
        icon = this.icon
      }

      // TODO: Upon a safe distance from the release of HA 2021.11 these
      // attributes can be removed from the <ha-icon-button>.
      // - icon (replaced with the embedded <ha-icon>)
      // - title (replaced with .label)
      return html` <ha-icon-button
        icon=${icon}
        class="${classMap(classes)}"
        .label=${this.title}
        title=${this.title}
      >
        <ha-icon icon=${icon}></ha-icon>
      </ha-icon-button>`;
    }

    if (!this.thumbnail) {
      return html``;
    }
    return html`<img
      src="${this.thumbnail}"
      class="${classMap(classes)}"
      title="${this.title}"
    />`;
  }

  static get styles(): CSSResultGroup {
    return unsafeCSS(controlStyle);
  }
}