import { NextResponse } from 'next/server'
import type { NextRequest } from 'next/server'

export async function middleware(request: NextRequest) {
  const { pathname } = request.nextUrl

  // Only protect API routes. /api/voice/event, /api/voice/tools/*, /api/voice/timer
  // have their own bearer-token auth (VOICE_API_KEY) and bypass the cookie check.
  const isVoiceBearer =
    pathname === '/api/voice/event' ||
    pathname.startsWith('/api/voice/tools/') ||
    pathname === '/api/voice/timer'
  if (!pathname.startsWith('/api/') || pathname.startsWith('/api/auth') || pathname.startsWith('/api/spotify') || pathname.startsWith('/api/settings') || isVoiceBearer) {
    return NextResponse.next()
  }

  // Internal loopback bypass: tool endpoints shell out to other API routes.
  // They pass x-voice-internal with the same VOICE_API_KEY — safe because
  // only processes on the same host (the tablet container itself) know the key.
  const internal = request.headers.get('x-voice-internal')
  if (internal && internal === process.env.VOICE_API_KEY) {
    return NextResponse.next()
  }

  // Check auth by forwarding to auth check
  const token = request.cookies.get('auth_token')?.value
  if (!token) {
    return NextResponse.json({ error: 'unauthorized' }, { status: 401 })
  }

  // Let the request through — individual API routes can do further validation if needed
  // The auth cookie existence is sufficient since it is httpOnly and set by server
  return NextResponse.next()
}

export const config = {
  matcher: ['/api/:path*'],
}
