import type { NextApiRequest, NextApiResponse } from "next";
import type { File as FormidableFile } from "formidable";
import formidable from "formidable";
import fs from "fs/promises";
import { createReport } from "@/lib/pdftron/serverSDK/createReport";

export const config = {
  api: {
    bodyParser: false, // ✅ 이게 false면 안 됨!
  },
};

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
) {
  if (req.method !== "POST") {
    return res.status(405).end();
  }

  try {
    const form = formidable({ multiples: false });

    form.parse(req, async (err, fields, files) => {
      if (err) {
        console.error(err);
        return res.status(500).json({ error: "Error parsing form" });
      }

      try {
        const fileName = fields?.customFileName?.[0] ?? "";
        const reportDatas = JSON.parse(fields?.reportDatas?.[0] ?? "[]") as {
          [key: string]: any;
        }[];
        const reportTempPath = fields?.reportTempPath?.[0] ?? "";
        const reportCoverPage: FormidableFile | undefined = files?.file?.[0];

        if (
          !reportCoverPage ||
          fileName.length === 0 ||
          reportDatas.length === 0 ||
          reportTempPath.length === 0
        ) {
          return res.status(400).json({ error: "Invalid Report Data" });
        }

        const buffer = await fs.readFile(reportCoverPage.filepath);

        const {
          result,
          buffer: pdfBuffer,
          error,
        } = await createReport(buffer, reportTempPath, reportDatas);

        if (result && pdfBuffer) {
          res.setHeader("Content-Type", "application/pdf");
          res.setHeader(
            "Content-Disposition",
            `attachment; filename="${fileName}"`
          );
        
          // ✅ 중요! PDFNet에서 나온 pdfBuffer(Uint8Array)를 Node Buffer로 감싸기
          return res.send(Buffer.from(pdfBuffer));          
        }

        return res
          .status(200)
          .json({
            success: false,
            message: "Report 생성에 실패하였습니다.",
            error,
          });
      } catch (e) {
        console.log(e);
        return res.status(400).json({ error: "Invalid additionalData" });
      }
    });
  } catch (err) {
    return res.status(401).end();
  }
}