import { NextResponse } from "next/server";
import { mkdir, writeFile } from "fs/promises";
import path from "path";
import crypto from "crypto";

export const runtime = "nodejs"; // 파일 시스템 사용

export async function POST(req: Request) {
  const form = await req.formData();
  const file = form.get("file") as File | null;
  if (!file) return NextResponse.json({ ok: false, error: "NO_FILE" }, { status: 400 });

  const bytes = Buffer.from(await file.arrayBuffer());
  const ext = (file.name.split(".").pop() || "png").toLowerCase();
  const name = `${crypto.randomUUID()}.${ext}`;
  const dir = path.join(process.cwd(), "public", "uploads");
  await mkdir(dir, { recursive: true });
  await writeFile(path.join(dir, name), bytes);

  // 정적 서빙: public/uploads/...
  const url = `/uploads/${name}`;
  return NextResponse.json({ ok: true, url });
}