// app/api/options/lens/route.ts
export const dynamic = "force-dynamic";

import { NextRequest, NextResponse } from "next/server";

const BASE = (
  process.env.DIRECTUS_URL || process.env.NEXT_PUBLIC_API_BASE_URL || ""
).replace(/\/$/, "");

function buildPath(target?: string | null) {
  // CO2 Gantry → focus lenses (name)
  // everything else (Fiber/UV/CO2 Galvo) → scan lenses (field_size + focal_length)
  const isGantry = target === "co2-gantry";

  if (isGantry) {
    const url = new URL(`${BASE}/items/laser_focus_lens`);
    url.searchParams.set("fields", "id,name");
    url.searchParams.set("sort", "name");
    return String(url);
  }

  const url = new URL(`${BASE}/items/laser_scan_lens`);
  url.searchParams.set("fields", "id,field_size,focal_length");
  url.searchParams.set("sort", "field_size,focal_length");
  return String(url);
}

async function dFetch(bearer: string, target?: string | null) {
  const res = await fetch(buildPath(target), {
    headers: { Accept: "application/json", Authorization: `Bearer ${bearer}` },
    cache: "no-store",
  });
  const text = await res.text().catch(() => "");
  let json: any = null;
  try {
    json = text ? JSON.parse(text) : null;
  } catch {}
  return { res, json, text };
}

export async function GET(req: NextRequest) {
  try {
    const userAt = req.cookies.get("ma_at")?.value;
    if (!userAt) {
      return NextResponse.json({ error: "Not authenticated" }, { status: 401 });
    }

    const target = req.nextUrl.searchParams.get("target");
    const r = await dFetch(userAt, target);
    if (!r.res.ok) {
      return NextResponse.json(
        { error: `Directus ${r.res.status}: ${r.text || r.res.statusText}` },
        { status: r.res.status }
      );
    }

    const rows: any[] = r.json?.data ?? [];
    const isGantry = target === "co2-gantry";

    const data = rows.map((row) => {
      if (isGantry) {
        // Focus lens: label is just the stored name
        return { id: row.id, name: row.name, label: row.name };
      }
      // Scan lens: label "300x300 mm | F420" etc
      const fs =
      row.field_size != null && row.field_size !== ""
      ? `${row.field_size} mm`
      : "";
      const fl =
      row.focal_length != null && row.focal_length !== ""
      ? `F${row.focal_length}`
      : "";
      const label = [fs, fl].filter(Boolean).join(" | ");
      return { id: row.id, name: label, label };
    });

    return NextResponse.json({ data });
  } catch (e: any) {
    return NextResponse.json(
      { error: e?.message || "Failed to load lenses" },
      { status: 500 }
    );
  }
}