package internal

import (
	"context"
	"fmt"

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

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

func LabelNode(nodeName string, leaseName string, cfg *Config) error {
	client, err := generateClient()
	if err != nil {
		return fmt.Errorf("Could not generate client: %s", err.Error())
	}

	return ApplyLabelToNode(client, nodeName, leaseName, cfg)

}

func ApplyLabelToNode(client kubernetes.Interface, nodeName string, leaseName string, cfg *Config) error {
	log.WithFields(log.Fields{
		"Caller": "ApplyLabelToNode",
	}).Info(fmt.Sprintf("Trying to label node %s", nodeName))

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

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

	node.Labels[cfg.CiliumLabel] = "true"
	node.Labels["cilium.uploadfilter24.eu/lease"] = leaseName

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

	log.WithFields(log.Fields{
		"Caller": "ApplyLabelToNode",
	}).Info(fmt.Sprintf("Node %s labeled with %s=%s\n", nodeName, cfg.CiliumLabel, "true"))

	return nil
}

func RemoveLabelFromNode(nodeName string) error {
	client, err := generateClient()
	if err != nil {
		return fmt.Errorf("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
}

func GetNodeNameFromLease(lease v1.Lease) (string, error) {
	if lease.Spec.HolderIdentity == nil {
		return "", fmt.Errorf("Lease %s has no HolderIdentity", lease.Name)
	}
	holderIdentity := *lease.Spec.HolderIdentity

	return holderIdentity, nil
}