import { NextResponse } from "next/server";
const TYPES = { junction: "drainage:geo_junctions", conduit: "drainage:geo_conduits", pipe: "drainage:geo_conduits", orifice: "drainage:geo_orifices", outfall: "drainage:geo_outfalls", pump: "drainage:geo_pumps" } as const;
export async function POST(request: Request) {
  const body = await request.json().catch(() => null) as { ids?: unknown; featureType?: unknown } | null;
  if (!body || !Array.isArray(body.ids) || body.ids.length < 1 || body.ids.length > 100 || !body.ids.every((id) => typeof id === "string" && id.trim())) return NextResponse.json({ code: "INVALID_REQUEST" }, { status: 400 });
  if (typeof body.featureType !== "string" || !(body.featureType in TYPES)) return NextResponse.json({ code: "UNSUPPORTED_FEATURE_TYPE" }, { status: 422 });
  const ids = body.ids.map((id) => String(id).trim()); const cql = `id IN (${ids.map((id) => `'${id.replaceAll("'", "''")}'`).join(",")})`;
  const url = new URL("https://geoserver.waternetwork.cn/geoserver/drainage/ows"); url.search = new URLSearchParams({ service: "WFS", version: "2.0.0", request: "GetFeature", typeNames: TYPES[body.featureType as keyof typeof TYPES], outputFormat: "application/json", srsName: "EPSG:4326", count: "100", cql_filter: cql }).toString();
  try { const response = await fetch(url, { signal: AbortSignal.timeout(8_000), cache: "no-store" }); const data = await response.json(); if (!response.ok || !data || data.type !== "FeatureCollection" || !Array.isArray(data.features)) throw new Error(); return NextResponse.json({ type: "FeatureCollection", features: data.features.slice(0, 100) }); }
  catch { return NextResponse.json({ code: "WFS_UNAVAILABLE" }, { status: 502 }); }
}