import {
  customElement,
  DeesElement,
  html,
  css,
  cssManager,
  property,
  state,
  type TemplateResult,
} from '@design.estate/dees-element';
import { demoFunc } from './dees-tile.demo.js';
import { cssGeistFontFamily } from '../../00fonts.js';
import { themeDefaultStyles } from '../../00theme.js';

declare global {
  interface HTMLElementTagNameMap {
    'dees-tile': DeesTile;
  }
}

/**
 * dees-tile — the unified "rounded on rounded" tile frame.
 *
 * RESPONSIBILITIES (what this component owns):
 *  1. Outer card — border, border-radius, background, overflow clipping
 *  2. Flex column layout — stacking header / content / footer vertically
 *  3. Content inset — the rounded inner area with border-top and border-bottom
 *  4. Default heading — styled 32px heading text when no slot="header" is provided
 *  5. Footer visibility — auto-hides footer area when slot="footer" is empty
 *
 * NOT RESPONSIBILITIES (what consumer components own):
 *  - Header/footer height, padding, font-size, colors when using custom slots
 *  - Content layout (absolute, flex, grid — consumer decides)
 *  - Any semantic meaning of header/footer content
 *
 * The header and footer slots are BARE containers (just flex-shrink: 0).
 * The slotted content fully controls its own appearance.
 * Only the default heading fallback (.tile-heading) carries tile-level styling.
 */
@customElement('dees-tile')
export class DeesTile extends DeesElement {
  public static demo = demoFunc;
  public static demoGroups = ['Layout'];

  @property({ type: String })
  accessor heading: string = '';

  @state()
  accessor hasFooter: boolean = false;

  public static styles = [
    themeDefaultStyles,
    cssManager.defaultStyles,
    css`
      :host {
        display: flex;
        flex-direction: column;
        font-family: ${cssGeistFontFamily};
        color: ${cssManager.bdTheme('hsl(0 0% 3.9%)', 'hsl(0 0% 98%)')};
      }

      /* --- The frame --- */
      .tile-outer {
        position: relative;
        flex: 1;
        min-height: 0;
        background: ${cssManager.bdTheme('hsl(0 0% 100%)', 'hsl(0 0% 3.9%)')};
        border: 1px solid ${cssManager.bdTheme('hsl(0 0% 89.8%)', 'hsl(0 0% 14.9%)')};
        border-radius: 8px;
        overflow: hidden;
        display: flex;
        flex-direction: column;
      }

      /* --- Header: bare container, only the default heading gets styled --- */
      .tile-header {
        flex-shrink: 0;
      }

      .tile-heading {
        height: 32px;
        line-height: 32px;
        padding: 0 16px;
        font-size: 14px;
        font-weight: 500;
        letter-spacing: -0.01em;
        color: ${cssManager.bdTheme('hsl(0 0% 20%)', 'hsl(0 0% 63.9%)')};
      }

      /* --- Content: the rounded inset --- */
      .tile-content {
        flex: 1;
        position: relative;
        border-radius: 8px;
        border-top: 1px solid ${cssManager.bdTheme('hsl(0 0% 89.8%)', 'hsl(0 0% 14.9%)')};
        border-bottom: 1px solid ${cssManager.bdTheme('hsl(0 0% 89.8%)', 'hsl(0 0% 14.9%)')};
        overflow: hidden;
      }

      .tile-content.no-footer {
        border-bottom: none;
        border-bottom-left-radius: 0;
        border-bottom-right-radius: 0;
      }

      /* --- Footer: bare container, consumer styles the slotted content --- */
      .tile-footer {
        flex-shrink: 0;
      }

      .tile-footer.hidden {
        display: none;
      }
    `,
  ];

  public render(): TemplateResult {
    return html`
      <div class="tile-outer" part="outer">
        <div class="tile-header" part="header">
          <slot name="header">
            <div class="tile-heading">${this.heading}</div>
          </slot>
        </div>
        <div class="tile-content ${!this.hasFooter ? 'no-footer' : ''}" part="content">
          <slot></slot>
        </div>
        <div class="tile-footer ${!this.hasFooter ? 'hidden' : ''}" part="footer">
          <slot name="footer" @slotchange=${this.onFooterSlotChange}></slot>
        </div>
      </div>
    `;
  }

  private onFooterSlotChange(e: Event) {
    const slot = e.target as HTMLSlotElement;
    this.hasFooter = slot.assignedNodes({ flatten: true }).length > 0;
  }
}