const multer = require("multer");
const sharp = require("sharp");

// Configure multer for memory storage (we'll process before saving to DB)
const upload = multer({
  storage: multer.memoryStorage(),
  limits: {
    fileSize: 10 * 1024 * 1024, // 10MB max file size
  },
  fileFilter: (req, file, cb) => {
    // Only accept images
    if (file.mimetype.startsWith("image/")) {
      cb(null, true);
    } else {
      cb(new Error("Only image files are allowed"), false);
    }
  },
});

// Middleware to process and compress images
const processImage = async (req, res, next) => {
  if (!req.file) {
    return next();
  }

  try {
    // Compress and resize image to 800x800px, JPEG quality 85
    const processedBuffer = await sharp(req.file.buffer)
      .resize(800, 800, {
        fit: "inside",
        withoutEnlargement: true,
      })
      .jpeg({ quality: 85 })
      .toBuffer();

    // Attach processed image to request
    req.processedImage = {
      buffer: processedBuffer,
      mimeType: "image/jpeg",
    };

    next();
  } catch (error) {
    res.status(400).json({ message: "Error processing image: " + error.message });
  }
};

module.exports = { upload, processImage };