// app/api/options/[collection]/route.ts
import { NextRequest, NextResponse } from "next/server";
import { directusFetch } from "@/lib/directus";

// Expandable label-field preferences per collection.
// We’ll try each key in order until we find a value.
const MAP: Record<
string,
{ coll: string; labelFields: string[] }
> = {
  material:               { coll: "material",               labelFields: ["name", "label", "title"] },
  material_coating:       { coll: "material_coating",       labelFields: ["name", "label", "title"] },
  material_color:         { coll: "material_color",         labelFields: ["name", "label", "title"] },
  material_opacity:       { coll: "material_opacity",       labelFields: ["name", "label", "title", "value"] },
  laser_software:         { coll: "laser_software",         labelFields: ["name", "label", "title"] },

  // NEW: Galvo scan head aperture list
  laser_scan_lens_apt:    { coll: "laser_scan_lens_apt",    labelFields: ["name", "label", "title", "aperture_mm", "size_mm", "value"] },

  // NEW: Beam expander multiplier list
  laser_scan_lens_exp:    { coll: "laser_scan_lens_exp",    labelFields: ["name", "label", "title", "multiplier", "value"] },
};

function pickLabel(it: any, candidates: string[]) {
  for (const k of candidates) if (it?.[k] != null && it[k] !== "") return String(it[k]);
  // fallback: try some common numeric-ish fields if present
  if (it?.value != null) return String(it.value);
  return String(it?.name ?? it?.label ?? it?.title ?? it?.id ?? "");
}

export async function GET(req: NextRequest, ctx: any) {
  try {
    const key = String(ctx?.params?.collection || "");
    const cfg = MAP[key];
    if (!cfg) return NextResponse.json({ data: [] });

    const { searchParams } = new URL(req.url);
    const q = (searchParams.get("q") || "").toLowerCase();

    // Keep fields=* so we can build a friendly label from whatever exists
    const url = `/items/${cfg.coll}?fields=*&limit=500`;
    const res = await directusFetch<{ data: any[] }>(url);
    const items = res?.data ?? [];

    const mapped = items.map((it) => ({
      id: String(it.id ?? it.submission_id ?? ""),
                                      name: pickLabel(it, cfg.labelFields),
                                      _search: `${Object.values(it).join(" ")}`.toLowerCase(),
    })).filter((m) => !!m.id);

    const filtered = q ? mapped.filter((m) => m._search.includes(q)) : mapped;
    filtered.sort((a, b) => (a.name ?? "").localeCompare(b.name ?? ""));
    return NextResponse.json({ data: filtered.map(({ _search, ...r }) => r) });
  } catch (err: any) {
    return NextResponse.json(
      { error: err?.message || "options error" },
      { status: 500 }
    );
  }
}