'use client';

import React, { useEffect, useState, useRef } from 'react';
import DOMPurify from 'isomorphic-dompurify';
import { parseRawEmail } from '@/lib/utils/email-mime-decoder';

interface EmailContentDisplayProps {
  content: string;
  type?: 'html' | 'text' | 'auto';
  className?: string;
  showQuotedText?: boolean;
}

/**
 * Component for displaying properly formatted email content
 * Handles MIME decoding, sanitization, and proper rendering
 */
const EmailContentDisplay: React.FC<EmailContentDisplayProps> = ({
  content,
  type = 'auto',
  className = '',
  showQuotedText = true
}) => {
  const [processedContent, setProcessedContent] = useState<{ 
    html: string;
    text: string;
    isHtml: boolean;
  }>({
    html: '',
    text: '',
    isHtml: false
  });
  
  const containerRef = useRef<HTMLDivElement>(null);
  
  // Process and sanitize email content
  useEffect(() => {
    if (!content) {
      setProcessedContent({ html: '', text: '', isHtml: false });
      return;
    }
    
    try {
      // Check if this is raw email content
      const isRawEmail = content.includes('Content-Type:') || 
                          content.includes('MIME-Version:') || 
                          content.includes('From:') && content.includes('To:');
      
      if (isRawEmail) {
        // Parse raw email content
        const parsed = parseRawEmail(content);
        
        // Check which content to use based on type and availability
        const useHtml = (type === 'html' || (type === 'auto' && parsed.html)) && !!parsed.html;
        
        if (useHtml) {
          // Sanitize HTML content
          const sanitizedHtml = DOMPurify.sanitize(parsed.html, {
            ADD_TAGS: ['table', 'thead', 'tbody', 'tr', 'td', 'th'],
            ADD_ATTR: ['target', 'rel', 'colspan', 'rowspan'],
            ALLOW_DATA_ATTR: false
          });
          
          setProcessedContent({
            html: sanitizedHtml,
            text: parsed.text,
            isHtml: true
          });
        } else {
          // Format plain text with line breaks
          const formattedText = parsed.text.replace(/\n/g, '<br />');
          setProcessedContent({
            html: formattedText,
            text: parsed.text,
            isHtml: false
          });
        }
      } else {
        // Treat as direct content (not raw email)
        const isHtmlContent = content.includes('<html') || 
                              content.includes('<body') || 
                              content.includes('<div') || 
                              content.includes('<p>') || 
                              content.includes('<br');
        
        if (isHtmlContent || type === 'html') {
          // Sanitize HTML content
          const sanitizedHtml = DOMPurify.sanitize(content, {
            ADD_TAGS: ['table', 'thead', 'tbody', 'tr', 'td', 'th'],
            ADD_ATTR: ['target', 'rel', 'colspan', 'rowspan', 'style', 'class', 'id', 'border'],
            ALLOW_DATA_ATTR: false
          });
          
          setProcessedContent({
            html: sanitizedHtml,
            text: content,
            isHtml: true
          });
        } else {
          // Format plain text with line breaks
          const formattedText = content.replace(/\n/g, '<br />');
          setProcessedContent({
            html: formattedText,
            text: content,
            isHtml: false
          });
        }
      }
    } catch (err) {
      console.error('Error processing email content:', err);
      // Fallback to plain text
      setProcessedContent({
        html: content.replace(/\n/g, '<br />'),
        text: content,
        isHtml: false
      });
    }
  }, [content, type]);
  
  // Process quoted content visibility and fix table styling
  useEffect(() => {
    if (!containerRef.current || !processedContent.html) return;
    
    const container = containerRef.current;
    
    // Handle quoted text visibility
    if (!showQuotedText) {
      // Add toggle buttons for quoted text sections
      const quotedSections = container.querySelectorAll('blockquote');
      
      quotedSections.forEach((quote, index) => {
        // Check if this quoted section already has a toggle
        if (quote.previousElementSibling?.classList.contains('quoted-toggle-btn')) {
          return;
        }
        
        // Create toggle button
        const toggleBtn = document.createElement('button');
        toggleBtn.innerText = '▼ Show quoted text';
        toggleBtn.className = 'quoted-toggle-btn';
        toggleBtn.style.cssText = 'background: none; border: none; color: #666; font-size: 12px; cursor: pointer; padding: 4px 0; display: block;';
        
        // Hide quoted section initially
        quote.style.display = 'none';
        
        // Add click handler
        toggleBtn.addEventListener('click', () => {
          const isHidden = quote.style.display === 'none';
          quote.style.display = isHidden ? 'block' : 'none';
          toggleBtn.innerText = isHidden ? '▲ Hide quoted text' : '▼ Show quoted text';
        });
        
        // Insert before the blockquote
        quote.parentNode?.insertBefore(toggleBtn, quote);
      });
    }
    
    // Process tables and ensure they're properly formatted
    const tables = container.querySelectorAll('table');
    tables.forEach(table => {
      // Cast to HTMLTableElement to access style property
      const tableElement = table as HTMLTableElement;
      
      // Only apply styling if the table doesn't already have border styles
      if (!tableElement.hasAttribute('border') && 
          (!tableElement.style.border || tableElement.style.border === '')) {
        // Apply proper table styling
        tableElement.style.width = '100%';
        tableElement.style.borderCollapse = 'collapse';
        tableElement.style.margin = '10px 0';
        tableElement.style.border = '1px solid #ddd';
      }
      
      const cells = table.querySelectorAll('td, th');
      cells.forEach(cell => {
        // Cast to HTMLTableCellElement to access style property
        const cellElement = cell as HTMLTableCellElement;
        
        // Only apply styling if the cell doesn't already have border styles
        if (!cellElement.style.border || cellElement.style.border === '') {
          cellElement.style.border = '1px solid #ddd';
          cellElement.style.padding = '6px';
        }
      });
    });
  }, [processedContent.html, showQuotedText]);
  
  return (
    <div 
      ref={containerRef}
      className={`email-content-display ${className}`}
      dangerouslySetInnerHTML={{ __html: processedContent.html }}
    />
  );
};

export default EmailContentDisplay;