/**
 * Vanilla JS adapter for the chat widget
 *
 * Provides a simple API for non-framework usage.
 */

import { initChatWidget } from '../index.js';
import type { ChatWidgetConfig, PageContext, ChatWidgetAPI as WidgetInstance } from '../index.js';

export type { ChatWidgetConfig, PageContext };

/**
 * Widget instance tracker
 */
let widgetInstance: WidgetInstance | null = null;
let containerElement: HTMLElement | null = null;

/**
 * Initialize the chat widget
 *
 * @param config - Widget configuration
 * @returns The created DOM element
 */
export function init(config: ChatWidgetConfig): HTMLElement {
  // Clean up existing instance if any
  if (widgetInstance && containerElement) {
    destroy();
  }

  // Create container
  containerElement = document.createElement('div');
  containerElement.id = 'chat-widget-container';
  containerElement.style.cssText = 'position: fixed; z-index: 1000;';
  document.body.appendChild(containerElement);

  // Initialize widget
  widgetInstance = initChatWidget(containerElement, config);

  return containerElement;
}

/**
 * Destroy the chat widget
 */
export function destroy(): void {
  if (widgetInstance) {
    // Properly destroy widget to prevent memory leaks
    widgetInstance.destroy();
    widgetInstance = null;
  }
  if (containerElement) {
    containerElement.remove();
    containerElement = null;
  }
}

/**
 * Check if widget is initialized
 */
export function isInitialized(): boolean {
  return widgetInstance !== null;
}

// Global export for <script> tag usage
if (typeof window !== 'undefined') {
  (window as Window & { ChatWidget?: typeof ChatWidgetAPI }).ChatWidget = {
    init,
    destroy,
    isInitialized,
  };
}

// Named export for module usage
export const ChatWidgetAPI = {
  init,
  destroy,
  isInitialized,
};

export default ChatWidgetAPI;