import { NextRequest, NextResponse } from "next/server";
import { uploadBuffer, generateObjectKey } from "@/app/lib/minio";

const MAX_SIZE = 20 * 1024 * 1024; // 20MB

export async function POST(request: NextRequest) {
  try {
    const form = await request.formData();
    const file = form.get("file");
    const fileObj =
      file != null && typeof file === "object" && "size" in file
        ? (file as File | Blob)
        : null;

    if (!fileObj || fileObj.size === 0) {
      return NextResponse.json(
        { ok: false, error: "请选择文件" },
        { status: 400 }
      );
    }

    if (fileObj.size > MAX_SIZE) {
      return NextResponse.json(
        { ok: false, error: "文件大小不能超过 20MB" },
        { status: 400 }
      );
    }

    const ext =
      (fileObj instanceof File ? fileObj.name : "").split(".").pop() ||
      (fileObj.type?.startsWith("video/") ? "mp4" : "jpg");
    const objectKey = generateObjectKey(ext);

    const buffer = Buffer.from(await fileObj.arrayBuffer());
    const contentType =
      (fileObj as File).type || "application/octet-stream";

    const { url } = await uploadBuffer(buffer, objectKey, contentType);

    return NextResponse.json({ ok: true, url });
  } catch (e) {
    const msg = e instanceof Error ? e.message : String(e);
    console.error("Upload media error:", e);
    return NextResponse.json(
      { ok: false, error: `上传失败: ${msg}` },
      { status: 500 }
    );
  }
}