'use client';

import React, { useMemo } from 'react';
import { EmailContent } from '@/types/email';
import { detectTextDirection, applyTextDirection } from '@/lib/utils/text-direction';
import { sanitizeHtml } from '@/lib/utils/dom-sanitizer';

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

/**
 * Unified component for displaying email content in a consistent way
 * This handles both HTML and plain text content with proper styling and RTL support
 */
const EmailContentDisplay: React.FC<EmailContentDisplayProps> = ({
  content,
  className = '',
  showQuotedText = true,
  type = 'auto',
  debug = false
}) => {
  // Create a safe content object with fallback values for missing properties
  const safeContent = useMemo(() => {
    if (!content) {
      return {
        text: '',
        html: undefined,
        isHtml: false,
        direction: 'ltr' as const
      };
    }
    return {
      text: content.text || '',
      html: content.html,
      isHtml: content.isHtml,
      // If direction is missing, detect it from the text content
      direction: content.direction || detectTextDirection(content.text)
    };
  }, [content]);

  // Determine what content to display based on type preference and available content
  const htmlToDisplay = useMemo(() => {
    // If no content is available, show a placeholder
    if (!safeContent.text && !safeContent.html) {
      return '<div class="text-gray-400">No content available</div>';
    }

    // If type is explicitly set to text, or we don't have HTML and auto mode
    if (type === 'text' || (type === 'auto' && !safeContent.isHtml)) {
      // Format plain text with line breaks for HTML display
      if (safeContent.text) {
        const formattedText = safeContent.text
          .replace(/&/g, '&amp;')
          .replace(/</g, '&lt;')
          .replace(/>/g, '&gt;')
          .replace(/\n/g, '<br>');
        
        return formattedText;
      }
    }
    
    // Otherwise use HTML content if available
    if (safeContent.isHtml && safeContent.html) {
      return safeContent.html;
    }
    
    // Fallback to text content if there's no HTML
    if (safeContent.text) {
      const formattedText = safeContent.text
        .replace(/&/g, '&amp;')
        .replace(/</g, '&lt;')
        .replace(/>/g, '&gt;')
        .replace(/\n/g, '<br>');
      
      return formattedText;
    }
    
    return '<div class="text-gray-400">No content available</div>';
  }, [safeContent, type]);
  
  // Handle quoted text display
  const processedHTML = useMemo(() => {
    if (!showQuotedText) {
      // This is simplified - a more robust approach would parse and handle
      // quoted sections more intelligently
      return htmlToDisplay.replace(/<blockquote[^>]*>[\s\S]*?<\/blockquote>/gi, 
        '<div class="text-gray-400">[Quoted text hidden]</div>');
    }
    return htmlToDisplay;
  }, [htmlToDisplay, showQuotedText]);
  
  // Sanitize HTML content and apply proper direction
  const sanitizedHTML = useMemo(() => {
    const clean = sanitizeHtml(processedHTML);
    
    // Apply text direction consistently using our utility
    return applyTextDirection(clean, safeContent.text);
  }, [processedHTML, safeContent.text]);
  
  return (
    <div className={`email-content-display ${className}`}>
      <div 
        className="email-content-inner"
        dangerouslySetInnerHTML={{ __html: sanitizedHTML }} 
      />
      
      {/* Debug output if enabled */}
      {debug && (
        <div className="mt-4 p-2 text-xs bg-gray-100 border rounded">
          <p><strong>Content Type:</strong> {safeContent.isHtml ? 'HTML' : 'Text'}</p>
          <p><strong>Direction:</strong> {safeContent.direction}</p>
          <p><strong>HTML Length:</strong> {safeContent.html?.length || 0}</p>
          <p><strong>Text Length:</strong> {safeContent.text?.length || 0}</p>
        </div>
      )}
      
      <style jsx>{`
        .email-content-display {
          width: 100%;
        }
        
        /* Enhanced RTL styling - handle direction at every level */
        [dir="rtl"] {
          text-align: right;
        }
        
        /* Ensure images don't overflow their containers */
        .email-content-inner img {
          max-width: 100%;
          height: auto;
        }
        
        /* Blockquote styling for LTR content */
        .email-content-inner blockquote {
          margin: 10px 0;
          padding-left: 15px;
          border-left: 2px solid #ddd;
          color: #666;
          background-color: #f9f9f9;
          border-radius: 4px;
        }
        
        /* Special styling for RTL blockquotes - handled via attribute selector */
        [dir="rtl"] blockquote {
          padding-left: 0;
          padding-right: 15px;
          border-left: none;
          border-right: 2px solid #ddd;
        }
      `}</style>
    </div>
  );
};

export default EmailContentDisplay;