import multer from "multer";
import crypto from "crypto";
import path from "path";
import fs from "fs";
import response from "../response.js";

const memoryStorage = multer.memoryStorage();

const fileFilter = (req, file, cb) => {
  const ext = path.extname(file.originalname).toLowerCase();
  if (ext === ".png" || ext === ".jpg" || ext === ".jpeg") {
    cb(null, true);
  } else {
    cb(
      new Error(
        "Invalid file type, only .png, .jpg, and .jpeg files are allowed!"
      ),
      false
    );
  }
};

const upload = multer({
  storage: memoryStorage,
  fileFilter,
  limits: { fileSize: 5 * 1024 * 1024 }, // Limit file size to 5MB
}).fields([
  { name: "icon", maxCount: 1 },
  { name: "thumbnail", maxCount: 1 },
]);

const saveFileToDisk = (file) => {
  const md5sum = crypto
    .createHash("md5")
    .update(Date.now().toString())
    .digest("hex");
  const ext = path.extname(file.originalname);
  const filename = `${md5sum}${ext}`;
  const filepath = path.join("public/uploads", filename);
  fs.writeFileSync(filepath, file.buffer);
  return filename;
};

const handleUpload = (req, res, next) => {
  upload(req, res, (err) => {
    if (err) {
      return response(400, null, err.message, res);
    }

    const files = req.files;
    const icon = files?.icon ? files.icon[0] : null;
    const thumbnail = files?.thumbnail ? files.thumbnail[0] : null;

    try {
      // Validate icon and thumbnail before saving
      if (icon && thumbnail) {
        const iconFilename = saveFileToDisk(icon);
        const thumbnailFilename = saveFileToDisk(thumbnail);

        // Update the filenames in the request object for further processing
        req.body.icon = iconFilename;
        req.body.thumbnail = thumbnailFilename;

        next();
      } else {
        return response(400, null, "Both icon and thumbnail are required", res);
      }
    } catch (error) {
      return response(500, null, "Internal Server Error", res);
    }
  });
};

export default handleUpload;