package karmadactl

import (
	"k8s.io/client-go/rest"
	"k8s.io/client-go/tools/clientcmd"
)

// KarmadaConfig provides a rest config based on the filesystem kubeconfig (via
// pathOptions) and context in order to talk to the control plane
// and the joining kubernetes cluster.
type KarmadaConfig interface {
	// GetRestConfig used to get a cluster's rest config.
	GetRestConfig(context, kubeconfigPath string) (*rest.Config, error)

	// GetClientConfig returns a ClientConfig from kubeconfigPath.
	// If kubeconfigPath is empty, will search KUBECONFIG from default path.
	// If context is not empty, the returned ClientConfig's current-context is the input context.
	GetClientConfig(context, kubeconfigPath string) clientcmd.ClientConfig
}

// karmadaConfig implements the KarmadaConfig interface.
type karmadaConfig struct {
	pathOptions *clientcmd.PathOptions
}

// NewKarmadaConfig creates a karmadaConfig for `karmadactl` commands.
func NewKarmadaConfig(pathOptions *clientcmd.PathOptions) KarmadaConfig {
	return &karmadaConfig{
		pathOptions: pathOptions,
	}
}

func (a *karmadaConfig) GetRestConfig(context, kubeconfigPath string) (*rest.Config, error) {
	clientConfig := a.GetClientConfig(context, kubeconfigPath)
	restConfig, err := clientConfig.ClientConfig()
	if err != nil {
		return nil, err
	}

	return restConfig, nil
}

// GetClientConfig is a helper method to create a client config from the
// context and kubeconfig passed as arguments.
func (a *karmadaConfig) GetClientConfig(context, kubeconfigPath string) clientcmd.ClientConfig {
	loadingRules := *a.pathOptions.LoadingRules
	loadingRules.ExplicitPath = kubeconfigPath
	loadingRules.Precedence = a.pathOptions.GetLoadingPrecedence()
	overrides := &clientcmd.ConfigOverrides{
		CurrentContext: context,
	}

	return clientcmd.NewNonInteractiveDeferredLoadingClientConfig(&loadingRules, overrides)
}