import { revalidatePath } from "next/cache";
import { serverAuth } from "@/lib/pb";

export const dynamic = "force-dynamic";

// POST /api/operators — add a person to the operator register from the app.
//
// This exists because people join and leave, and the rate sheet is only re-issued
// occasionally. A row written here is NOT in data/source/operators.json, which is why
// the seed reconciles that collection by employee code instead of clearing it — this
// row survives every future re-seed and the log names it.
//
// An operator with NO employee code is rejected: the code is what a later allocation
// is preserved against, so a row without one could never keep its machine across a
// re-seed.
export async function POST(req: Request) {
  let body: { name?: string; employeeCode?: string; rate?: number | string; assetId?: string } = {};
  try {
    body = await req.json();
  } catch {
    return Response.json({ ok: false, error: "Invalid JSON body" }, { status: 400 });
  }

  const name = (body.name || "").trim();
  const employeeCode = (body.employeeCode || "").trim();
  const rate = typeof body.rate === "string" ? Number(body.rate) : body.rate;

  if (!name) return Response.json({ ok: false, error: "Name is required" }, { status: 400 });
  if (!employeeCode) {
    return Response.json(
      { ok: false, error: "Employee number is required — it is what keeps this person's machine across a re-seed" },
      { status: 400 },
    );
  }
  if (typeof rate !== "number" || !Number.isFinite(rate) || rate <= 0) {
    return Response.json({ ok: false, error: "Rate must be a number greater than zero" }, { status: 400 });
  }

  try {
    const pb = await serverAuth();

    // Names are not unique, employee codes are. Two rows sharing a code would also
    // break the allocation capture, so this is enforced, not advisory.
    const clash = (await pb.collection("operators").getFullList())
      .find((o) => (o.employee_code || "").trim().toUpperCase() === employeeCode.toUpperCase());
    if (clash) {
      return Response.json(
        { ok: false, error: `${employeeCode} is already used by ${clash.name}` },
        { status: 409 },
      );
    }

    let assetId = "";
    if (body.assetId) {
      const asset = await pb.collection("assets").getOne(body.assetId).catch(() => null);
      if (!asset) {
        return Response.json({ ok: false, error: "That plant item no longer exists" }, { status: 400 });
      }
      assetId = asset.id;
    }

    const created = await pb.collection("operators").create({
      name,
      employee_code: employeeCode,
      rate: Math.round(rate * 100) / 100,
      asset: assetId,
      // Marked as app-added so the seed log can name it, and so it is obvious where
      // the row came from when someone audits the register.
      source: "Added in app",
    });

    revalidatePath("/running");
    revalidatePath("/employees", "layout");
    return Response.json({
      ok: true,
      operator: { id: created.id, name: created.name, employee_code: created.employee_code, rate: created.rate },
    });
  } catch (e: any) {
    return Response.json({ ok: false, error: e?.message || "Could not add the operator" }, { status: 500 });
  }
}