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

const APEX_HOST = 'greenlenspro.com'
const WWW_HOST = `www.${APEX_HOST}`
const ENGLISH_PATHS = new Set([
  '/best-plant-identification-app',
  '/plant-identifier-app',
  '/plant-scanner',
  '/flower-scanner',
  '/houseplant-identifier',
  '/succulent-identifier',
  '/identify-plant-photo',
  '/plant-disease-identifier',
  '/plant-health-app',
  '/plant-care-app',
])

function getLangForPath(pathname: string) {
  if (pathname === '/es' || pathname.startsWith('/es/')) return 'es'
  if (pathname === '/vs/google-lens') return 'de'
  if (ENGLISH_PATHS.has(pathname) || pathname.startsWith('/vs/')) return 'en'
  return 'de'
}

export function proxy(request: NextRequest) {
  const host = request.headers.get('host')
  const forwardedProto = request.headers.get('x-forwarded-proto')
  const requestHeaders = new Headers(request.headers)
  requestHeaders.set('x-greenlens-lang', getLangForPath(request.nextUrl.pathname))

  if (!host || (host !== APEX_HOST && host !== WWW_HOST)) {
    return NextResponse.next({ request: { headers: requestHeaders } })
  }

  const url = request.nextUrl.clone()
  let shouldRedirect = false

  if (host === WWW_HOST) {
    url.host = APEX_HOST
    shouldRedirect = true
  }

  if (forwardedProto === 'http' || url.protocol === 'http:') {
    url.protocol = 'https:'
    shouldRedirect = true
  }

  return shouldRedirect
    ? NextResponse.redirect(url, 308)
    : NextResponse.next({ request: { headers: requestHeaders } })
}

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