import multer from 'multer'
import generateRandomString from './generateRandomString.js'
import { completeEnvironment } from './backendOptions.js'

const imageStorage = multer.diskStorage({
  // Destination to store image
  destination: 'uploads',
  filename: (req, file, cb) => {
    const originalNameArray = file.originalname.split('.')
    const extension = originalNameArray[originalNameArray.length - 1]
    const randomText = generateRandomString()
    cb(null, `${Date.now()}_${randomText}.${extension.toLocaleLowerCase()}`)
  }
})

function uploadHandler(extensionsRegex?: RegExp, storage?: multer.StorageEngine) {
  return multer({
    storage: storage ? storage : imageStorage,
    limits: {
      fileSize: completeEnvironment.uploadLimit * 1024 * 1024 // 15 MB.
    },
    fileFilter(req, file, cb) {
      const name = file.originalname.toLowerCase()
      const isFileAllowed = !(
        name.match(
          extensionsRegex
            ? extensionsRegex
            : /\.(png|jpg|jpeg|gifv|gif|webp|avif|av1|mp4|mov|webm|mkv|aac|mp3|wav|ogg|oga|m4a|pdf)$/
        ) == null
      )
      cb(null, isFileAllowed)
    }
  })
}

export default uploadHandler