import { CollectionBeforeChangeHook } from 'payload/types'
import type { AdapterInterface, UploadedFile } from '../adapter.d'

const uploadHook = (adapter: AdapterInterface<unknown, unknown>) => {
  const beforeChange: CollectionBeforeChangeHook = async (args) => {
    const { req, data } = args
    if (req?.files?.file) {
      let uploadedFile: UploadedFile
      if (Array.isArray(req.files.file)) {
        uploadedFile = req.files.file[0]
      } else {
        uploadedFile = req.files.file
      }

      const resizedBuffers = req.payloadUploadSizes
        ? Object.keys(req.payloadUploadSizes)
          .map(uploadSize => {
            const name = data?.sizes?.[uploadSize]?.filename
            const mimetype = uploadedFile?.mimetype
            const buffer = req?.payloadUploadSizes?.[uploadSize]

            if (name && mimetype && buffer) {
              return adapter.upload({
                name,
                data: buffer,
                mimetype: mimetype
              })
            }

            return null
          })
          .filter(buffer => buffer !== null)
        : []

      await Promise.all([adapter.upload(uploadedFile), ...resizedBuffers])
    }
  }

  return beforeChange
}

export default uploadHook