'use server';
import { NextResponse, type NextRequest } from 'next/server';
import { i18n } from '@/i18n-config';

const { locales, defaultLocale: staticDefaultLocale } = i18n;

let cachedDefaultLocale = '';
let cacheTime = 0;

async function getDefaultLocale(origin: string, cookieLocale?: string): Promise<string> {
    if (cookieLocale) {
        return cookieLocale;
    }
    if (cachedDefaultLocale && Date.now() - cacheTime < 10000) {
        return cachedDefaultLocale;
    }
    try {
        const res = await fetch(`${origin}/api/default-locale`);
        if (res.ok) {
            const data = await res.json();
            if (data.defaultLocale) {
                cachedDefaultLocale = data.defaultLocale;
                cacheTime = Date.now();
                return cachedDefaultLocale;
            }
        }
    } catch (e) {
        console.error('Failed to fetch default locale in middleware:', e);
    }
    return staticDefaultLocale;
}

export async function middleware(request: NextRequest) {
    const { pathname } = request.nextUrl;
    console.log('[DEBUG] Running ROOT middleware for path:', pathname);

    if (pathname.startsWith('/uploads/videos/')) {
        return new NextResponse('Access Denied: Direct file access is forbidden', { status: 403 });
    }

    if (
        pathname.startsWith('/_next') ||
        pathname.startsWith('/api') ||
        pathname.startsWith('/uploads') ||
        pathname.includes('.')
    ) {
        return NextResponse.next();
    }

    if (pathname === '/install' || pathname.startsWith('/install/')) {
        return NextResponse.next();
    }

    if (pathname === '/admin' || pathname.startsWith('/admin/')) {
        const authCookie = request.cookies.get('auth');
        const isLoggedIn = authCookie?.value === 'true';
        const isAdminLoginPage = pathname === '/admin/login';

        if (!isLoggedIn && !isAdminLoginPage) {
            return NextResponse.redirect(new URL('/admin/login', request.url));
        }
        if (isLoggedIn && isAdminLoginPage) {
            return NextResponse.redirect(new URL('/admin', request.url));
        }
        return NextResponse.next();
    }

    const userLocale = request.cookies.get('userLocale')?.value;
    const defaultLocaleCookie = request.cookies.get('defaultLocale')?.value;
    const resolvedLocale = userLocale || defaultLocaleCookie;
    const defaultLocale = await getDefaultLocale(request.nextUrl.origin, resolvedLocale);

    const pathnameHasLocale = locales.some(
        (locale) => pathname.startsWith(`/${locale}/`) || pathname === `/${locale}`
    );

    if (pathname.startsWith(`/${defaultLocale}/`) || pathname === `/${defaultLocale}`) {
        const newPath = pathname.replace(`/${defaultLocale}`, '') || '/';
        return NextResponse.redirect(new URL(newPath, request.url));
    }
    
    if (!pathnameHasLocale) {
        const newUrl = request.nextUrl.clone();
        newUrl.pathname = `/${defaultLocale}${pathname}`;
        return NextResponse.rewrite(newUrl);
    }
    
    return NextResponse.next();
}

export const config = {
  matcher: [
    '/((?!api|_next/static|_next/image|uploads|favicon.ico|robots.txt|manifest.json|sitemap.xml).*)',
    '/uploads/videos/:path*',
  ],
};