package internal

import (
	"context"
	"errors"
	"fmt"

	log "github.com/sirupsen/logrus"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/rest"
)

func generateClient() (kubernetes.Clientset, error) {
	log.WithFields(log.Fields{
		"Caller": "generateClient",
	}).Info(fmt.Sprintf("Generating k8s client"))
	config, err := rest.InClusterConfig()
	if err != nil {
		return kubernetes.Clientset{}, errors.New(fmt.Sprintf("Could not generate in cluster config: %s", err.Error()))
	}
	clientset, err := kubernetes.NewForConfig(config)
	if err != nil {
		return kubernetes.Clientset{}, errors.New(fmt.Sprintf("Could not generate clientset: %s", err.Error()))
	}
	return *clientset, nil
}

func LabelNode(nodeName string) error {

	client, err := generateClient()
	if err != nil {
		return errors.New(fmt.Sprintf("Could not generate client: %s", err.Error()))
	}

	log.WithFields(log.Fields{
		"Caller": "LabelNode",
	}).Info(fmt.Sprintf("Trying to label node %s", nodeName))

	labelKey := "metallb-speaker"
	labelValue := "true"

	node, err := client.CoreV1().Nodes().Get(context.TODO(), nodeName, metav1.GetOptions{})
	if err != nil {
		return errors.New(fmt.Sprintf("Could not find Kubernetes node: %s", err.Error()))
	}

	if node.Labels == nil {
		node.Labels = make(map[string]string)
	}
	node.Labels[labelKey] = labelValue

	_, err = client.CoreV1().Nodes().Update(context.TODO(), node, metav1.UpdateOptions{})
	if err != nil {
		return errors.New(fmt.Sprintf("Could not update node label: %s", err.Error()))
	}

	log.WithFields(log.Fields{
		"Caller": "LabelNode",
	}).Info(fmt.Sprintf("Node %s labeled with %s=%s\n", nodeName, labelKey, labelValue))

	return nil

}

// TODO: handle node change
func RemoveLabelFromNode(nodeName string) error {
	client, err := generateClient()
	if err != nil {
		return errors.New(fmt.Sprintf("Could not generate client: %s", err.Error()))
	}

	log.WithFields(log.Fields{
		"Caller": "LabelNode",
	}).Info(fmt.Sprintf("Removing Label from node %s", nodeName))

	labelKey := "metallb-speaker"

	node, err := client.CoreV1().Nodes().Get(context.TODO(), nodeName, metav1.GetOptions{})
	if err != nil {
		panic(err.Error())
	}

	delete(node.Labels, labelKey)

	_, err = client.CoreV1().Nodes().Update(context.TODO(), node, metav1.UpdateOptions{})
	if err != nil {
		panic(err.Error())
	}

	fmt.Printf("Label %s removed from node %s\n", labelKey, nodeName)

	return nil
}