config

type Client interface {
	// Providers provide access to provider configurations.
	Providers() ProvidersClient

	// Variables provide access to environment variables and/or variables defined in the clusterctl configuration file.
	Variables() VariablesClient
}

type Option func(*configClient)

type Provider interface {
	// Name returns the name of the provider.
	Name() string

	// Type returns the type of the provider.
	Type() clusterctlv1.ProviderType

	// URL returns the name of the provider repository.
	URL() string

	// SameAs returns true if two providers have the same name and type.
	// Please note that this uniquely identifies a provider configuration, but not the provider instances in the cluster
	// because it is possible to create many instances of the same provider.
	SameAs(other Provider) bool

	// ManifestLabel returns the cluster.x-k8s.io/provider label value for a provider.
	// Please note that this label uniquely identifies the provider, e.g. bootstrap-kubeadm, but not the instances of
	// the provider, e.g. namespace-1/bootstrap-kubeadm and namespace-2/bootstrap-kubeadm
	ManifestLabel() string

	// Less func can be used to ensure a consist order of provider lists.
	Less(other Provider) bool
}

type ProvidersClient interface {
	// List returns all the provider configurations, including provider configurations hard-coded in clusterctl
	// and user-defined provider configurations read from the clusterctl configuration file.
	// In case of conflict, user-defined provider override the hard-coded configurations.
	List() ([]Provider, error)

	// Get returns the configuration for the provider with a given name/type.
	// In case the name/type does not correspond to any existing provider, an error is returned.
	Get(name string, providerType clusterctlv1.ProviderType) (Provider, error)
}

type Reader interface {
	// Init allows to initialize the configuration reader.
	Init(path string) error

	// Get returns a configuration value of type string.
	// In case the configuration value does not exists, it returns an error.
	Get(key string) (string, error)

	// Set allows to set an explicit override for a config value.
	// e.g. It is used to set an override from a flag value over environment/config file variables.
	Set(key, value string)

	// UnmarshalKey reads a configuration value and unmarshals it into the provided value object.
	UnmarshalKey(key string, value interface{}) error
}

type VariablesClient interface {
	// Get returns a variable value. If the variable is not defined an error is returned.
	// In case the same variable is defined both within the environment variables and clusterctl configuration file,
	// the environment variables value takes precedence.
	Get(key string) (string, error)

	// Set allows to set an explicit override for a config value.
	// e.g. It is used to set an override from a flag value over environment/config file variables.
	Set(key, values string)
}