/**
 * Next.js Middleware
 *
 * Handles authentication and route protection
 */

import { createServerClient } from '@supabase/ssr'
import { NextResponse, type NextRequest } from 'next/server'

export async function middleware(request: NextRequest) {
  let supabaseResponse = NextResponse.next({
    request,
  })

  const supabase = createServerClient(
    process.env.NEXT_PUBLIC_SUPABASE_URL!,
    process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
    {
      cookies: {
        getAll() {
          return request.cookies.getAll()
        },
        setAll(cookiesToSet) {
          cookiesToSet.forEach(({ name, value }) =>
            request.cookies.set(name, value)
          )
          supabaseResponse = NextResponse.next({
            request,
          })
          cookiesToSet.forEach(({ name, value, options }) =>
            supabaseResponse.cookies.set(name, value, options)
          )
        },
      },
    }
  )

  // Refresh session if expired - required for Server Components
  const {
    data: { user },
  } = await supabase.auth.getUser()

  const { pathname } = request.nextUrl

  // Public routes that don't require authentication
  const publicRoutes = [
    '/',
    '/login',
    '/reset-password',
    '/update-password',
    '/auth/callback',
    '/contact',
    '/blog',
    '/documentatie',
    '/api/leads',
    '/robots.txt',
    '/sitemap.xml',
  ]

  // API routes - let them handle auth themselves
  const isApiRoute = pathname.startsWith('/api/')

  // Check if current path is public
  const isPublicRoute = publicRoutes.some(route =>
    pathname === route || pathname.startsWith(`${route}/`)
  )

  // Static files and Next.js internals
  if (
    pathname.startsWith('/_next') ||
    pathname.startsWith('/static') ||
    pathname.includes('.')
  ) {
    return supabaseResponse
  }

  // Allow API routes to pass through - they handle auth internally
  if (isApiRoute) {
    return supabaseResponse
  }

  // Redirect to login if not authenticated and trying to access protected route
  if (!user && !isPublicRoute) {
    const redirectUrl = new URL('/login', request.url)
    redirectUrl.searchParams.set('redirect', pathname)
    return NextResponse.redirect(redirectUrl)
  }

  // Helper: get preferred interface redirect path
  const getPreferredPath = () => {
    const preference = user?.user_metadata?.preferred_interface
    return preference === 'cortex' ? '/epd/cortex' : '/epd/clients'
  }

  // Redirect to preferred interface if authenticated and trying to access login
  if (user && pathname === '/login') {
    return NextResponse.redirect(new URL(getPreferredPath(), request.url))
  }

  // Redirect /epd to preferred interface based on user preference
  if (user && pathname === '/epd') {
    return NextResponse.redirect(new URL(getPreferredPath(), request.url))
  }

  return supabaseResponse
}

export const config = {
  matcher: [
    /*
     * Match all request paths except:
     * - _next/static (static files)
     * - _next/image (image optimization files)
     * - favicon.ico (favicon file)
     * - public folder
     */
    '/((?!_next/static|_next/image|favicon.ico|.*\\.(?:svg|png|jpg|jpeg|gif|webp)$).*)',
  ],
}