package ezconf

// Integration is an interface that packages can implement to provide
// easy integration with ezconf
type Integration interface {
	// Name returns the name to use when registering the config
	Name() string

	// PackagePath returns the path to the package for source parsing
	PackagePath() string

	// ConfigFunc returns the ConfigFromEnv function
	ConfigFunc() func() (interface{}, error)

	// GroupName returns the display name for grouping environment variables
	GroupName() string
}

// RegisterIntegration registers a package that implements the Integration interface
func (cl *ConfigLoader) RegisterIntegration(integration Integration) error {
	// Add package path
	pkgPath := integration.PackagePath()
	if err := cl.AddPackagePath(pkgPath); err != nil {
		return err
	}

	// Store group name for this package
	cl.groupNames[pkgPath] = integration.GroupName()

	// Add config function
	if err := cl.AddConfigFunc(integration.Name(), integration.ConfigFunc()); err != nil {
		return err
	}

	return nil
}

// RegisterIntegrations registers multiple integrations at once
func (cl *ConfigLoader) RegisterIntegrations(integrations ...Integration) error {
	for _, integration := range integrations {
		if err := cl.RegisterIntegration(integration); err != nil {
			return err
		}
	}
	return nil
}