/**
 * Copyright 2025 LY Corporation
 *
 * LY Corporation licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';
import i18nConfig from 'next-i18next.config';

import { Path } from '@/shared/constants';

export function proxy(req: NextRequest) {
  if (Path.isErrorPage(req.nextUrl.pathname)) return NextResponse.next();

  // Swagger is proxied by next.config.js to the private Nest API service.
  // It must bypass the authenticated-page redirect below so that the public
  // documentation URL is not sent to /main when a jwt cookie is present.
  const isSwaggerRoute =
    req.nextUrl.pathname === '/docs' ||
    req.nextUrl.pathname.startsWith('/docs/') ||
    req.nextUrl.pathname === '/docs-json' ||
    req.nextUrl.pathname === '/admin-docs' ||
    req.nextUrl.pathname.startsWith('/admin-docs/') ||
    req.nextUrl.pathname === '/admin-docs-json' ||
    req.nextUrl.pathname === '/secretary-docs' ||
    req.nextUrl.pathname.startsWith('/secretary-docs/') ||
    req.nextUrl.pathname === '/secretary-docs-json';
  if (isSwaggerRoute) return NextResponse.next();

  const jwt = req.cookies.get('jwt')?.value;
  const isProtected = Path.isProtectPage(req.nextUrl.pathname);
  const isAuthRoute = req.nextUrl.pathname.startsWith('/auth');
  const isDemoPage = req.nextUrl.pathname.startsWith('/demo');
  const isSupportWorkflowPage =
    req.nextUrl.pathname.startsWith('/support') ||
    req.nextUrl.pathname === '/fixed-ip-request' ||
    req.nextUrl.pathname === '/ops' ||
    req.nextUrl.pathname.startsWith('/admin/issues');

  if (jwt && !isProtected && !isDemoPage && !isSupportWorkflowPage && !isAuthRoute) {
    return NextResponse.redirect(new URL(Path.MAIN, req.url));
  }

  if (!jwt && isProtected) {
    const parmas = new URLSearchParams(req.nextUrl.search);
    if (parmas.get('callback_url')) {
      return NextResponse.redirect(
        new URL(
          Path.SIGN_IN + '?callback_url=' + parmas.get('callback_url'),
          req.url,
        ),
      );
    } else {
      const requestPath = `${req.nextUrl.pathname}${encodeURIComponent(
        req.nextUrl.search,
      )}`;
      return NextResponse.redirect(
        new URL(Path.SIGN_IN + '?callback_url=' + requestPath, req.url),
      );
    }
  }

  if (req.nextUrl.locale === 'default') {
    const requestPath = `${req.nextUrl.pathname}${req.nextUrl.search}`;
    const locale =
      req.cookies.get('NEXT_LOCALE')?.value ?? i18nConfig.i18n.defaultLocale;
    return NextResponse.redirect(new URL(`/${locale}${requestPath}`, req.url));
  }

  return NextResponse.next();
}

export const config = {
  matcher: '/((?!api|_next/static|_next/image|favicon.ico|fonts|assets).*)',
};