import {
  DeesElement,
  html,
  property,
  customElement,
  cssManager,
  css,
  type TemplateResult,
} from '@design.estate/dees-element';

import * as lucideIcons from 'lucide';
import { createElement } from 'lucide';

declare global {
  interface HTMLElementTagNameMap {
    'sio-icon': SioIcon;
  }
}

@customElement('sio-icon')
export class SioIcon extends DeesElement {
  public static demo = () => html`
    <div style="display: flex; gap: 16px; align-items: center;">
      <sio-icon icon="search"></sio-icon>
      <sio-icon icon="message-square" color="#3b82f6"></sio-icon>
      <sio-icon icon="x" size="32"></sio-icon>
      <sio-icon icon="send" strokeWidth="3"></sio-icon>
    </div>
  `;

  @property({ type: String })
  public icon: string;

  @property({ type: Number })
  public size: number = 24;

  @property({ type: String })
  public color: string = 'currentColor';

  @property({ type: Number })
  public strokeWidth: number = 2;

  // Cache for rendered icons
  private static iconCache = new Map<string, string>();
  private static readonly MAX_CACHE_SIZE = 100;

  // Track last rendered properties to avoid unnecessary updates
  private lastIcon: string | null = null;
  private lastSize: number | null = null;
  private lastColor: string | null = null;
  private lastStrokeWidth: number | null = null;

  public static styles = [
    cssManager.defaultStyles,
    css`
      :host {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        line-height: 1;
        vertical-align: middle;
      }
      
      #iconContainer {
        display: flex;
        align-items: center;
        justify-content: center;
      }
      
      #iconContainer svg {
        display: block;
        width: 100%;
        height: 100%;
      }
    `,
  ];

  public render(): TemplateResult {
    return html`
      <div id="iconContainer" style="width: ${this.size}px; height: ${this.size}px;"></div>
    `;
  }

  public updated() {
    // Check if we need to update
    if (
      this.lastIcon === this.icon &&
      this.lastSize === this.size &&
      this.lastColor === this.color &&
      this.lastStrokeWidth === this.strokeWidth
    ) {
      return;
    }

    // Update tracking properties
    this.lastIcon = this.icon;
    this.lastSize = this.size;
    this.lastColor = this.color;
    this.lastStrokeWidth = this.strokeWidth;

    const container = this.shadowRoot?.querySelector('#iconContainer') as HTMLElement;
    if (!container || !this.icon) return;

    // Clear container
    container.innerHTML = '';

    // Create cache key
    const cacheKey = `${this.icon}:${this.size}:${this.color}:${this.strokeWidth}`;

    // Check cache
    if (SioIcon.iconCache.has(cacheKey)) {
      container.innerHTML = SioIcon.iconCache.get(cacheKey)!;
      return;
    }

    try {
      // Convert icon name to PascalCase (e.g., 'message-square' -> 'MessageSquare')
      const pascalCaseName = this.icon
        .split('-')
        .map(part => part.charAt(0).toUpperCase() + part.slice(1))
        .join('');

      const iconComponent = (lucideIcons as any)[pascalCaseName];
      if (!iconComponent) {
        console.warn(`Lucide icon '${pascalCaseName}' not found`);
        return;
      }

      // Create the icon element
      const svgElement = createElement(iconComponent, {
        size: this.size,
        color: this.color,
        strokeWidth: this.strokeWidth,
      });

      if (svgElement) {
        // Cache the result
        const svgString = svgElement.outerHTML;
        SioIcon.iconCache.set(cacheKey, svgString);
        
        // Limit cache size
        if (SioIcon.iconCache.size > SioIcon.MAX_CACHE_SIZE) {
          const firstKey = SioIcon.iconCache.keys().next().value;
          SioIcon.iconCache.delete(firstKey);
        }

        // Append to container
        container.appendChild(svgElement);
      }
    } catch (error) {
      console.error(`Error rendering icon ${this.icon}:`, error);
    }
  }

  public async disconnectedCallback() {
    await super.disconnectedCallback();
    // Clear references
    this.lastIcon = null;
    this.lastSize = null;
    this.lastColor = null;
    this.lastStrokeWidth = null;
  }
}