package storagehandlers

import (
	"backend/config"
	"backend/typesdefs"

	"errors"
	"mime/multipart"
)

type StorageHandler interface {
	Init() error
	Add(file *multipart.FileHeader, fileId string) error
	Delete(filename string) error
	Get(filename string) (string, error)
	List() ([]string, error)
}

func NewStorageHandler(strategy typesdefs.StorageStrategy) (StorageHandler, error) {
	if config.Cfg.Storage.Path == "" {
		return nil, errors.New("storage path not set")
	}
	switch strategy {
	case typesdefs.FS:
		h := NewFsHandler()
		err := h.Init()
		if err != nil {
			return nil, err
		}
		return h, nil

	case typesdefs.S3:
		h, err := NewS3Handler()
		if err != nil {
			return nil, err
		}
		err = h.Init()
		if err != nil {
			return nil, err
		}
		return h, nil
	default:
		return nil, errors.New("invalid storage strategy")
	}
}