import { writeFile, mkdir } from "node:fs/promises";
import { resolve } from "node:path";

export default defineEventHandler(async (event) => {
  const parts = await readMultipartFormData(event);
  if (!parts || parts.length === 0) {
    throw createError({ statusCode: 400, message: "No file provided" });
  }

  const filePart = parts.find((p) => p.name === "file");
  if (!filePart || !filePart.filename) {
    throw createError({ statusCode: 400, message: "No file provided" });
  }

  const filename = filePart.filename.replace(/[^a-zA-Z0-9._-]/g, "_");
  const dir = resolve(process.cwd(), "public/files");

  await mkdir(dir, { recursive: true });
  await writeFile(resolve(dir, filename), filePart.data);

  return { name: filename, size: filePart.data.length };
});