oss

var (
	// URLTemplate default URL template
	URLTemplate = "/system/{{class}}/{{primary_key}}/{{column}}/{{filename_with_hash}}"
	// Storage the storage used to save medias
	Storage oss.StorageInterface = filesystem.New("public")
)

var DefaultRetrieveHandler = func(oss OSS, path string) (media.FileInterface, error) {
	result, err := Storage.GetStream(path)
	if f, ok := result.(media.FileInterface); ok {
		return f, err
	}

	if err == nil {
		buf := []byte{}
		if buf, err = ioutil.ReadAll(result); err == nil {
			result := ClosingReadSeeker{bytes.NewReader(buf)}
			result.Seek(0, 0)
			return result, err
		}
	}
	return nil, err
}

var DefaultStoreHandler = func(oss OSS, path string, option *media.Option, reader io.Reader) error {
	_, err := Storage.Put(path, reader)
	return err
}

var DefaultURLTemplateHandler = func(oss OSS, option *media.Option) (url string) {
	if url = option.Get("URL"); url == "" {
		url = URLTemplate
	}

	url = strings.Join([]string{strings.TrimSuffix(Storage.GetEndpoint(), "/"), strings.TrimPrefix(url, "/")}, "/")
	if strings.HasPrefix(url, "/") {
		return url
	}

	for _, prefix := range []string{"https://", "http://"} {
		url = strings.TrimPrefix(url, prefix)
	}

	return "//" + url
}