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

type MapEntry = { path: string; fields: string; label: (x: any) => string };

const MAP: Record<string, MapEntry> = {
  material:         { path: "/items/material",         fields: "id,name",    label: (x) => String(x.name ?? x.id) },
  material_coating: { path: "/items/material_coating", fields: "id,name",    label: (x) => String(x.name ?? x.id) },
  material_color:   { path: "/items/material_color",   fields: "id,name",    label: (x) => String(x.name ?? x.id) },
  material_opacity: { path: "/items/material_opacity", fields: "id,opacity", label: (x) => String(x.opacity ?? x.id) },
  laser_software:   { path: "/items/laser_software",   fields: "id,name",    label: (x) => String(x.name ?? x.id) },
  // laser_source and lens have dedicated routes
};

export async function GET(req: Request, ctx: any) {
  try {
    const { searchParams } = new URL(req.url);
    const key = ctx?.params?.collection as string;
    const q = (searchParams.get("q") || "").trim().toLowerCase();
    const limit = Number(searchParams.get("limit") || "500");

    const cfg = MAP[key];
    if (!cfg) {
      return NextResponse.json({ error: "unsupported collection" }, { status: 400 });
    }

    const url = `${cfg.path}?fields=${encodeURIComponent(cfg.fields)}&limit=${limit}`;
    const { data } = await directusFetch<{ data: any[] }>(url);
    const list = Array.isArray(data) ? data : [];

    const mapped = list.map((x) => ({
      id: String(x.id),
                                    label: cfg.label(x),
                                    _s: Object.values(x).join(" ").toLowerCase(),
    }));

    const filtered = q ? mapped.filter((m) => m._s.includes(q)) : mapped;
    filtered.sort((a, b) => a.label.localeCompare(b.label));

    return NextResponse.json({ data: filtered.map(({ id, label }) => ({ id, label })) });
  } catch (e: any) {
    return NextResponse.json({ error: e?.message || "Failed to load options" }, { status: 500 });
  }
}