'use client';

import { useEffect, useRef, useState } from 'react';
import { useSession } from 'next-auth/react';

interface ResponsiveIframeProps {
  src: string;
  className?: string;
  allow?: string;
  style?: React.CSSProperties;
  token?: string;
}

export function ResponsiveIframe({ src, className = '', allow, style, token }: ResponsiveIframeProps) {
  const iframeRef = useRef<HTMLIFrameElement>(null);
  const { data: session } = useSession();
  const [authError, setAuthError] = useState<string | null>(null);
  
  // Add token parameter only if token is provided
  const fullSrc = token ? 
    `${src}${src.includes('?') ? '&' : '?'}token=${encodeURIComponent(token)}` : 
    src;

  // Handle silent authentication refresh
  useEffect(() => {
    let silentRefreshTimer: NodeJS.Timeout;
    
    // Set up periodic silent refresh (every 15 minutes)
    const startSilentRefresh = () => {
      silentRefreshTimer = setInterval(() => {
        console.log('Performing silent authentication check for iframes');
        
        // Create a hidden iframe for silent authentication
        const refreshFrame = document.createElement('iframe');
        refreshFrame.style.display = 'none';
        refreshFrame.src = '/silent-refresh';
        document.body.appendChild(refreshFrame);
        
        // Remove iframe after it has loaded (5 seconds timeout)
        setTimeout(() => {
          if (refreshFrame && refreshFrame.parentNode) {
            refreshFrame.parentNode.removeChild(refreshFrame);
          }
        }, 5000);
      }, 15 * 60 * 1000); // 15 minutes
    };
    
    if (session) {
      startSilentRefresh();
    }
    
    return () => {
      if (silentRefreshTimer) {
        clearInterval(silentRefreshTimer);
      }
    };
  }, [session]);

  useEffect(() => {
    const iframe = iframeRef.current;
    if (!iframe) return;

    const calculateHeight = () => {
      const pageY = (elem: HTMLElement): number => {
        return elem.offsetParent ? 
          (elem.offsetTop + pageY(elem.offsetParent as HTMLElement)) : 
          elem.offsetTop;
      };

      const height = document.documentElement.clientHeight;
      const iframeY = pageY(iframe);
      const newHeight = Math.max(0, height - iframeY);
      iframe.style.height = `${newHeight}px`;
    };

    const handleHashChange = () => {
      if (window.location.hash && window.location.hash.length) {
        const iframeURL = new URL(iframe.src);
        iframeURL.hash = window.location.hash;
        iframe.src = iframeURL.toString();
      }
    };
    
    // Handle authentication messages from iframe
    const handleMessage = (event: MessageEvent) => {
      // Accept messages from our iframe or from silent auth iframe
      if (event.source !== iframe.contentWindow && 
          !event.data?.type?.startsWith('SILENT_AUTH_')) return;
      
      const { type, data, error } = event.data || {};
      
      // Handle auth-related messages
      if (type === 'AUTH_ERROR' || type === 'SESSION_EXPIRED') {
        console.log('Auth error in iframe:', data || error);
        setAuthError(error || 'Authentication error');
      } else if (type === 'SILENT_AUTH_SUCCESS') {
        console.log('Silent authentication successful');
        setAuthError(null);
      } else if (type === 'SILENT_AUTH_FAILURE') {
        console.log('Silent authentication failed:', error);
        // Only set error if it's persistent
        if (error !== 'loading') {
          setAuthError('Session expired');
        }
      }
    };

    // Initial setup
    calculateHeight();
    handleHashChange();

    // Event listeners
    window.addEventListener('resize', calculateHeight);
    window.addEventListener('hashchange', handleHashChange);
    window.addEventListener('message', handleMessage);
    iframe.addEventListener('load', calculateHeight);

    // Cleanup
    return () => {
      window.removeEventListener('resize', calculateHeight);
      window.removeEventListener('hashchange', handleHashChange);
      window.removeEventListener('message', handleMessage);
      iframe.removeEventListener('load', calculateHeight);
    };
  }, []);

  return (
    <>
      {authError && (
        <div 
          style={{
            backgroundColor: 'rgba(255, 0, 0, 0.1)',
            padding: '10px',
            borderRadius: '4px',
            marginBottom: '10px'
          }}
        >
          Authentication error: {authError}. The service might not work correctly.
        </div>
      )}
      <iframe
        ref={iframeRef}
        id="myFrame"
        src={fullSrc}
        className={`w-full border-none ${className}`}
        style={{
          display: 'block',
          width: '100%',
          height: '100%',
          ...style
        }}
        allow={allow}
        allowFullScreen
      />
    </>
  );
}