Vercel Edge LLM Proxy

// Vercel Edge Middleware for LLM Proxy
import { NextResponse } from 'next/server'
import type { NextRequest } from 'next/server'

export const config = {
  runtime: 'edge',
  matcher: '/api/llm/:path*'
}

export async function middleware(request: NextRequest) {
  const startTime = Date.now()
  
  // Route to appropriate LLM provider
  const provider = request.headers.get('x-llm-provider') || 'openai'
  
  const response = await fetch(`https://api.${provider}.com/v1/`, {
    method: request.method,
    headers: {
      'Authorization': `Bearer ${process.env[provider.toUpperCase() + '_KEY']}`,
      'Content-Type': 'application/json'
    },
    body: request.body
  })
  
  // Add timing header
  const responseTime = Date.now() - startTime
  response.headers.set('x-edge-latency', responseTime.toString())
  
  return response
}