export default defineEventHandler(async (event) => {
  const url = getRequestURL(event)
  
  // Fix MIME type issues for Nuxt assets
  if (url.pathname.startsWith('/_nuxt/')) {
    const ext = url.pathname.split('.').pop()?.toLowerCase()
    
    switch (ext) {
      case 'js':
        setHeader(event, 'Content-Type', 'application/javascript; charset=utf-8')
        break
      case 'mjs':
        setHeader(event, 'Content-Type', 'application/javascript; charset=utf-8')
        break
      case 'css':
        setHeader(event, 'Content-Type', 'text/css; charset=utf-8')
        break
      case 'json':
        setHeader(event, 'Content-Type', 'application/json; charset=utf-8')
        break
      case 'svg':
        setHeader(event, 'Content-Type', 'image/svg+xml; charset=utf-8')
        break
    }
  }
  
  // Handle proxy headers for API requests
  if (url.pathname.startsWith('/api/')) {
    // Trust proxy headers
    const realIP = getHeader(event, 'x-real-ip') || getHeader(event, 'x-forwarded-for')
    const proto = getHeader(event, 'x-forwarded-proto') || 'http'
    const host = getHeader(event, 'host')
    
    // Set CORS headers for cross-origin requests through proxy
    setHeader(event, 'Access-Control-Allow-Origin', '*')
    setHeader(event, 'Access-Control-Allow-Methods', 'GET, POST, OPTIONS')
    setHeader(event, 'Access-Control-Allow-Headers', 'Content-Type, Authorization, Range')
    
    // Handle music file requests specially
    if (url.pathname.startsWith('/api/music/')) {
      // Ensure proper caching headers for audio files
      setHeader(event, 'Cache-Control', 'public, max-age=3600') // 1 hour cache
      setHeader(event, 'Accept-Ranges', 'bytes')
      
      // Add security headers (but allow DevTools)
      setHeader(event, 'X-Content-Type-Options', 'nosniff')
      // Don't set X-Frame-Options DENY for development
      if (process.env.NODE_ENV === 'production') {
        setHeader(event, 'X-Frame-Options', 'DENY')
      }
    }
  }
  
  // Handle OPTIONS preflight requests
  if (event.node.req.method === 'OPTIONS') {
    setHeader(event, 'Access-Control-Allow-Origin', '*')
    setHeader(event, 'Access-Control-Allow-Methods', 'GET, POST, OPTIONS')
    setHeader(event, 'Access-Control-Allow-Headers', 'Content-Type, Authorization, Range')
    setResponseStatus(event, 200)
    return ''
  }
})