// app/api/directus/fields/route.ts
import { NextRequest, NextResponse } from "next/server";

const DIRECTUS_URL = (process.env.DIRECTUS_URL || "").replace(/\/$/, "");
const AUTH_HEADER = process.env.DIRECTUS_TOKEN_SUBMIT
? { Authorization: `Bearer ${process.env.DIRECTUS_TOKEN_SUBMIT}` }
: {};

export const dynamic = "force-dynamic"; // no caching
export const revalidate = 0;

export async function GET(req: NextRequest) {
    const { searchParams } = new URL(req.url);
    const collection = searchParams.get("collection");

    if (!collection) {
        return NextResponse.json({ error: "Missing `collection`" }, { status: 400 });
    }

    // 1) Preferred: /fields/{collection}
    const url1 = `${DIRECTUS_URL}/fields/${encodeURIComponent(collection)}`;
    let res = await fetch(url1, { headers: AUTH_HEADER, cache: "no-store" });

    // 2) Fallback: /fields?filter[collection][_eq]=...
    if (!res.ok) {
        const url2 = `${DIRECTUS_URL}/fields?filter[collection][_eq]=${encodeURIComponent(collection)}`;
        res = await fetch(url2, { headers: AUTH_HEADER, cache: "no-store" });
    }

    if (!res.ok) {
        const body = await res.text().catch(() => "");
        return NextResponse.json(
            { error: "Directus request failed", status: res.status, body },
            { status: 502 },
        );
    }

    const json = await res.json().catch(() => ({}));
    return NextResponse.json(json);
}