const multer = require('multer')
const path = require('path')
const fs = require('fs')

const uploadsDir = path.join(__dirname, '..', 'public', 'uploads')

if (!fs.existsSync(uploadsDir)) {
  fs.mkdirSync(uploadsDir, { recursive: true })
}

const storage = multer.diskStorage({
  destination: (_req, _file, cb) => {
    cb(null, uploadsDir)
  },
  filename: (_req, file, cb) => {
    const timestamp = Date.now()
    const random = Math.round(Math.random() * 1e9)
    const ext = path.extname(file.originalname) || '.bin'
    cb(null, `${timestamp}-${random}${ext}`)
  }
})

function fileFilter(_req, file, cb) {
  if (file.mimetype.startsWith('image/')) {
    cb(null, true)
  } else {
    cb(new Error('Only image uploads are allowed'))
  }
}

const upload = multer({
  storage,
  fileFilter,
  limits: {
    fileSize: 5 * 1024 * 1024 // 5MB per file
  }
})

module.exports = {
  upload,
  uploadsDir
}