middleware.ts

import { auth } from '~/server/auth'
import { NextResponse } from 'next/server'

export default auth((req) => {
  if (req.nextUrl.pathname.startsWith('/api/v1') && !req.auth) {
    return Response.json(
      { success: false, message: 'authentication failed' },
      { status: 401 }
    )
  }
  if (req.nextUrl.pathname.startsWith('/admin') && !req.auth) {
    return NextResponse.redirect(new URL('/login', req.url))
  }
  if (req.auth && req.nextUrl.pathname === '/login') {
    return NextResponse.redirect(new URL('/', req.url))
  }
  if (req.nextUrl.pathname.includes('/preview/')) {
    const startIndex = req.nextUrl.pathname.indexOf('/preview/') + '/preview/'.length;
    const contentAfterPreview = req.nextUrl.pathname.substring(startIndex);
    if (req.nextUrl.pathname.startsWith('/preview')) {
      const redirectUrl = new URL('/', req.url)
      redirectUrl.searchParams.set('id', String(contentAfterPreview))
      return NextResponse.redirect(redirectUrl)
    } else {
      let endIndex = req.nextUrl.pathname.indexOf('/preview');
      let contentBeforePreview = req.nextUrl.pathname.substring(0, endIndex);
      const redirectUrl = new URL(contentBeforePreview, req.url)
      redirectUrl.searchParams.set('id', String(contentAfterPreview))
      return NextResponse.redirect(redirectUrl)
    }
  }
});

// Optionally, don't invoke Middleware on some paths
// Read more: https://nextjs.org/docs/app/building-your-application/routing/middleware#matcher
export const config = {
  matcher: [
    "/((?!_next/static|_next/image|favicon.ico).*)",
    "/admin/:path*",
    '/api/v1/:path*',
  ],
}