import { NextResponse, NextRequest } from 'next/server';
import { routing } from '@/i18n/routing';

export const config = {
	matcher:  [
		"/((?!api|_next|.*\\..*).*)"
	]
};

// Proxy für geschützte Routen + i18n + Cookies
export async function proxy(request: NextRequest) {
	const locale = routing.locales.find(locale =>
		request.nextUrl.pathname.startsWith(`/${locale}`)
	);

	if (!locale) {
		let newLang = 
			request.headers
				.get('accept-language')
				?.split(',')[0]
				?.split('-')[0];

		if (!newLang)
			newLang = routing.defaultLocale;
		else {
			const langAvailable = (routing.locales as readonly string[]).includes(newLang);
			if (!langAvailable) newLang = routing.defaultLocale;
		}

		const redirect = `/${newLang}`
			+ request.nextUrl.pathname
			+ request.nextUrl.search;

		return NextResponse.redirect(new URL(redirect, request.url));
	}

	const headers = new Headers();
	headers.set('X-NEXT-INTL-LOCALE', locale);

	return NextResponse.next({
		request: { headers }
	});
}