/**
 * Simple MIME decoder for compose message box
 * Handles basic email content without creating nested structures
 */

export function decodeComposeContent(content: string): string {
  if (!content) return '';
  
  // Basic HTML cleaning without creating nested structures
  let cleaned = content
    // Remove script and style tags
    .replace(/<script[^>]*>[\s\S]*?<\/script>/gi, '')
    .replace(/<style[^>]*>[\s\S]*?<\/style>/gi, '')
    // Remove meta tags
    .replace(/<meta[^>]*>/gi, '')
    // Remove head and title
    .replace(/<head[^>]*>[\s\S]*?<\/head>/gi, '')
    .replace(/<title[^>]*>[\s\S]*?<\/title>/gi, '')
    // Remove body tags
    .replace(/<body[^>]*>/gi, '')
    .replace(/<\/body>/gi, '')
    // Remove html tags
    .replace(/<html[^>]*>/gi, '')
    .replace(/<\/html>/gi, '')
    // Handle basic formatting
    .replace(/<br\s*\/?>/gi, '\n')
    .replace(/<p[^>]*>/gi, '\n')
    .replace(/<\/p>/gi, '\n')
    // Handle lists
    .replace(/<ul[^>]*>/gi, '\n')
    .replace(/<\/ul>/gi, '\n')
    .replace(/<ol[^>]*>/gi, '\n')
    .replace(/<\/ol>/gi, '\n')
    .replace(/<li[^>]*>/gi, '• ')
    .replace(/<\/li>/gi, '\n')
    // Handle basic text formatting
    .replace(/<strong[^>]*>/gi, '**')
    .replace(/<\/strong>/gi, '**')
    .replace(/<b[^>]*>/gi, '**')
    .replace(/<\/b>/gi, '**')
    .replace(/<em[^>]*>/gi, '*')
    .replace(/<\/em>/gi, '*')
    .replace(/<i[^>]*>/gi, '*')
    .replace(/<\/i>/gi, '*')
    // Handle links
    .replace(/<a[^>]*href="([^"]*)"[^>]*>(.*?)<\/a>/gi, '$2 ($1)')
    // Handle basic entities
    .replace(/&nbsp;/g, ' ')
    .replace(/&amp;/g, '&')
    .replace(/&lt;/g, '<')
    .replace(/&gt;/g, '>')
    .replace(/&quot;/g, '"')
    .replace(/&#39;/g, "'")
    // Clean up whitespace
    .replace(/\s+/g, ' ')
    .trim();
  
  // Do NOT wrap in additional divs
  return cleaned;
}

export function encodeComposeContent(content: string): string {
  if (!content) return '';
  
  // Basic HTML encoding without adding structure
  const encoded = content
    .replace(/&/g, '&amp;')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;')
    .replace(/'/g, '&#39;')
    .replace(/\n/g, '<br>');
  
  return encoded;
}