// LegacyLoadFromReader reads the non-nested configuration data given and sets up the
// auth config information with given directory and populates the receiver object
func (configFile *ConfigFile) LegacyLoadFromReader(configData io.Reader) error {
	b, err := ioutil.ReadAll(configData)
	if err != nil {
		return err
	}

	if err := json.Unmarshal(b, &configFile.AuthConfigs); err != nil {
		arr := strings.Split(string(b), "\n")
		if len(arr) < 2 {
			return fmt.Errorf("The Auth config file is empty")
		}
		authConfig := types.AuthConfig{}
		origAuth := strings.Split(arr[0], " = ")
		if len(origAuth) != 2 {
			return fmt.Errorf("Invalid Auth config file")
		}
		authConfig.Username, authConfig.Password, err = decodeAuth(origAuth[1])
		if err != nil {
			return err
		}
		authConfig.ServerAddress = defaultIndexserver
		configFile.AuthConfigs[defaultIndexserver] = authConfig
	} else {
		for k, authConfig := range configFile.AuthConfigs {
			authConfig.Username, authConfig.Password, err = decodeAuth(authConfig.Auth)
			if err != nil {
				return err
			}
			authConfig.Auth = ""
			authConfig.ServerAddress = k
			configFile.AuthConfigs[k] = authConfig
		}
	}
	return nil
}

// Store saves the given credentials in the file store.
func (c *nativeStore) Store(authConfig types.AuthConfig) error {
	if err := c.storeCredentialsInStore(authConfig); err != nil {
		return err
	}
	authConfig.Username = ""
	authConfig.Password = ""
	authConfig.IdentityToken = ""

	// Fallback to old credential in plain text to save only the email
	return c.fileStore.Store(authConfig)
}

// getCredentialsFromStore executes the command to get the credentials from the native store.
func (c *nativeStore) getCredentialsFromStore(serverAddress string) (types.AuthConfig, error) {
	var ret types.AuthConfig

	creds, err := client.Get(c.programFunc, serverAddress)
	if err != nil {
		if credentials.IsErrCredentialsNotFound(err) {
			// do not return an error if the credentials are not
			// in the keyckain. Let docker ask for new credentials.
			return ret, nil
		}
		return ret, err
	}

	if creds.Username == tokenUsername {
		ret.IdentityToken = creds.Secret
	} else {
		ret.Password = creds.Secret
		ret.Username = creds.Username
	}

	ret.ServerAddress = serverAddress
	return ret, nil
}

// Auth contacts the public registry with the provided credentials,
// and returns OK if authentication was successful.
// It can be used to verify the validity of a client's credentials.
func (s *Service) Auth(authConfig *types.AuthConfig) (string, error) {
	addr := authConfig.ServerAddress
	if addr == "" {
		// Use the official registry address if not specified.
		addr = IndexServer
	}
	index, err := s.ResolveIndex(addr)
	if err != nil {
		return "", err
	}

	endpointVersion := APIVersion(APIVersionUnknown)
	if V2Only {
		// Override the endpoint to only attempt a v2 ping
		endpointVersion = APIVersion2
	}

	endpoint, err := NewEndpoint(index, nil, endpointVersion)
	if err != nil {
		return "", err
	}
	authConfig.ServerAddress = endpoint.String()
	return Login(authConfig, endpoint)
}