import { NextResponse } from "next/server";
import { auth } from "@/auth";
import {
  createAssetItem,
  listAssetItems,
  validateCreateAssetItemInput,
  type AssetItemStatus,
} from "@/lib/assets";

// Mirrors src/app/api/employees/route.ts's pattern — middleware.ts excludes
// /api from route protection, so this checks the session itself. Flat
// permission model (CLAUDE.md): only "logged in or not", no role check.
export async function POST(request: Request): Promise<NextResponse> {
  const session = await auth();
  if (!session) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
  }

  let body: unknown;
  try {
    body = await request.json();
  } catch {
    return NextResponse.json({ error: "Request body must be valid JSON" }, { status: 400 });
  }

  if (typeof body !== "object" || body === null) {
    return NextResponse.json({ error: "Request body must be a JSON object" }, { status: 400 });
  }

  const {
    serialNumber,
    assetTag,
    modelId,
    purchaseDate,
    warrantyEndDate,
    purchaseOrderId,
    cost,
    costCurrency,
    externalPoNumber,
    areaId,
  } = body as Record<string, unknown>;
  const validation = validateCreateAssetItemInput({
    serialNumber,
    assetTag,
    modelId,
    purchaseDate,
    warrantyEndDate,
    purchaseOrderId,
    cost,
    costCurrency,
    externalPoNumber,
    areaId,
  });

  if (!validation.ok) {
    return NextResponse.json({ error: validation.error }, { status: 400 });
  }

  const created = await createAssetItem(validation.value);
  if (!created.ok) {
    return NextResponse.json({ error: created.error }, { status: 400 });
  }

  return NextResponse.json(created.value, { status: 201 });
}

// The one entity route in this app whose GET response is NOT a bare array
// (see src/hooks/use-api-list.ts's doc comment on that being the norm
// everywhere else) -- it's `{items, total}` instead, because /assets is
// paginated (2026-08-25, see listAssetItems()'s doc comment) and the
// client needs `total` to render page controls. src/app/assets/page.tsx
// fetches this directly rather than through useApiList for that reason.
export async function GET(request: Request): Promise<NextResponse> {
  const session = await auth();
  if (!session) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
  }

  const url = new URL(request.url);
  const params = url.searchParams;
  const page = params.has("page") ? Number(params.get("page")) : undefined;
  const pageSize = params.has("pageSize") ? Number(params.get("pageSize")) : undefined;
  const status = params.get("status") ?? undefined;
  const modelId = params.get("modelId") ?? undefined;
  const categoryId = params.get("categoryId") ?? undefined;
  const areaId = params.get("areaId") ?? undefined;
  const search = params.get("search") ?? undefined;

  const validStatuses = ["in_stock", "assigned", "repair", "retired", "lost"];
  const result = await listAssetItems({
    page,
    pageSize,
    status: status && validStatuses.includes(status) ? (status as AssetItemStatus) : undefined,
    modelId,
    categoryId,
    areaId,
    search,
  });
  return NextResponse.json(result, { status: 200 });
}