package handler

import (
	"context"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"log"
	"main/argohandler"
	"main/db"
	"net/http"
	"strings"

	corev1 "k8s.io/api/core/v1"

	//	"github.com/gorilla/mux"

	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/bson/primitive"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/tools/clientcmd"
)

type Cluster struct {
	ID              primitive.ObjectID `bson:"_id,omitempty"`
	Name            string             `json:"name"`
	Namespace       string             `json:"namespace"`
	ControlPlane    string             `json:"controlPlane"`
	PlatformVersion string             `json:"platformversion`
	Cpu             string             `json:"cpu"`
	Memory          string             `json:"memory"`
	CreatedAt       string             `json:"createdAt"`
	UserID          primitive.ObjectID `json:"userId"`
	Cluster_config  string             `json:"clusterconfig"`
}

type Header struct {
	Authorization string `bson:"token"`
}

type Pod struct {
	Name      string `json:name`
	Namespace string `json:name`
	Status    string `json:status`
	Restart   string `json:restart`
	Age       string `json:age`
}

type Service struct {
	Name       string `json:name`
	Namespace  string `json:name`
	Type       string `json:type`
	ClusterIP  string `json:clusterIp`
	ExternalIP string `json:externalIp`
	Ports      string `json:ports`
	Age        string `json:age`
}

type Deployment struct {
	Name         string `json:name`
	Namespace    string `json:namespace`
	Ready        string `json:Ready`
	UpdateToDate string `json:uptodate`
	Available    string `json:available`
}

type Daemonset struct {
	Name         string `json:name`
	Namespace    string `json:namespace`
	Ready        string `json:Ready`
	Age          string `json:age`
	DESIRED      string `json:desired`
	CURRENT      string `json:current`
	UpdateToDate string `json:uptodate`
	Available    string `json:available`
	Node         string `json:node`
	Selector     string `json:selector`
}

type Jobs struct {
	Namespace  string `json:name`
	Name       string `json:name`
	Status     string `json:status`
	Completion string `json:completion`
	Duration   string `json:duration`
	Age        string `json:age`
}

type Replicaset struct {
	Name      string `json:name`
	Desired   string `json:desired`
	Current   string `json:current`
	Ready     string `json:Ready`
	Age       string `json:age`
	Namespace string `json:name`
}

type ReplicationController struct {
	Namespace string `json:name`
	Name      string `json:name`
	Desired   string `json:desired`
	Current   string `json:current`
	Ready     string `json:Ready`
	Age       string `json:age`
}

type StatefulSet struct {
	Namespace string `json:name`
	Name      string `json:name`
	Ready     string `json:Ready`
	Age       string `json:age`
}

func CreateClusterHandler(w http.ResponseWriter, r *http.Request) {

	var cluster Cluster
	_ = json.NewDecoder(r.Body).Decode(&cluster)

	var header Header
	header.Authorization = r.Header.Get("Authorization")

	// vclusterCollection := db.Vclusters_details.FindOne(context.TODO(), bson.M{"name": Cluster.Name}).Decode(&existsCluster)

	if cluster.Name == "" || cluster.ControlPlane == "" || cluster.PlatformVersion == "" || cluster.Cpu == "" || cluster.Memory == "" {
		http.Error(w, "Invalid input", http.StatusBadRequest)
		return
	}

	var existsCluster Cluster
	_ = db.Vclusters_details.FindOne(context.TODO(), bson.M{"name": cluster.Name}).Decode(&existsCluster)

	if existsCluster.Name == cluster.Name {
		http.Error(w, "Cluster name is duplicated", http.StatusBadRequest)
		return
	}

	res, err := db.Vclusters_details.InsertOne(context.TODO(), cluster)
	if err != nil {
		http.Error(w, `{"message": "Could not create cluster"}`, http.StatusInternalServerError)
	}

	objectID := res.InsertedID.(primitive.ObjectID)
	idStr := objectID.Hex()

	argohandler.CreateApp(idStr, cluster.Name, cluster.ControlPlane, cluster.PlatformVersion, cluster.Cpu, cluster.Memory, "userid")

	response := map[string]string{"message": "Cluster created"}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(response)

}

func getClientset(w http.ResponseWriter, clustername string) (*kubernetes.Clientset, error) {

	kubeconfig, err := getClusterConfig(clustername)
	if err != nil {
		http.Error(w, "File to get kubeconfig", http.StatusInternalServerError)
		return nil, err
	}

	kubeconfigbyte := []byte(kubeconfig)
	config, err := clientcmd.RESTConfigFromKubeConfig(kubeconfigbyte)

	if err != nil {
		log.Fatal("Error creating clientSet:", err)
	}

	clientset, err := kubernetes.NewForConfig(config)
	if err != nil {
		log.Fatal("Error creating clientSet:", err)
	}

	return clientset, nil
}

func ListUserClusters(w http.ResponseWriter, r *http.Request) {
	// var cluster Cluster
	_, clusterList := argohandler.ListUserClusters("userid")

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(clusterList)

}

func Cluster_namespaces(w http.ResponseWriter, r *http.Request) {

	clustername := r.URL.Query().Get("Name")

	if clustername == "" {
		http.Error(w, "Missing 'Name' parameter", http.StatusBadRequest)
		return
	}

	clientset, err := getClientset(w, clustername)

	if err != nil {
		log.Fatal("Error getting clientset: ", err)
	}

	listOfnamespaces, err := clientset.CoreV1().Namespaces().List(context.TODO(), metav1.ListOptions{})

	if err != nil {
		log.Fatal("Error getting list of pods: ", err)
	}

	var nslist []string
	for _, ns := range listOfnamespaces.Items {
		nslist = append(nslist, ns.Name)
	}

	if err != nil {
		http.Error(w, "Internal Error", http.StatusInternalServerError)
	}
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(nslist)

}

func Cluster_services(w http.ResponseWriter, r *http.Request) {

	clustername := r.URL.Query().Get("Name")
	namespace := r.URL.Query().Get("Namespace")

	if clustername == "" {
		http.Error(w, "Missing 'Name' parameter", http.StatusBadRequest)
		return
	}

	clientset, err := getClientset(w, clustername)

	if err != nil {
		log.Fatal("Error getting clientset: ", err)
	}

	services, err := clientset.CoreV1().Services(namespace).List(context.TODO(), metav1.ListOptions{})

	if err != nil {
		log.Fatal("Error getting list of services: ", err)
	}

	Allservice := []Service{}

	var service Service
	for _, s := range services.Items {
		service.Name = s.Name
		service.Namespace = s.Namespace
		service.Type = string(s.Spec.Type)
		service.Ports = servicePortsToString(s.Spec.Ports)
		service.ClusterIP = s.Spec.ClusterIP
		if len(s.Spec.ExternalIPs) > 0 {
			service.ExternalIP = s.Spec.ExternalIPs[0]
		}

		Allservice = append(Allservice, service)
	}

	//pod_list, err := json.Marshal(Allservice)
	if err != nil {
		http.Error(w, "Internal Error", http.StatusInternalServerError)
	}
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(Allservice)

}

func Cluster_statefulset(w http.ResponseWriter, r *http.Request) {

	clustername := r.URL.Query().Get("Name")
	namespace := r.URL.Query().Get("Namespace")

	if clustername == "" {
		http.Error(w, "Missing 'Name' parameter", http.StatusBadRequest)
		return
	}

	clientset, err := getClientset(w, clustername)

	if err != nil {
		log.Fatal("Error getting clientset: ", err)
	}

	statefulSets, err := clientset.AppsV1().StatefulSets(namespace).List(context.TODO(), metav1.ListOptions{})

	if err != nil {
		log.Fatal("Error getting list of StatefulSets: ", err)
	}

	AllstatefulSets := []StatefulSet{}

	var StatefulSet StatefulSet
	for _, s := range statefulSets.Items {
		StatefulSet.Name = s.Name
		StatefulSet.Namespace = s.Namespace
		StatefulSet.Ready = string(s.Status.ReadyReplicas)
		AllstatefulSets = append(AllstatefulSets, StatefulSet)
	}

	//pod_list, err := json.Marshal(Allservice)
	if err != nil {
		http.Error(w, "Internal Error", http.StatusInternalServerError)
	}
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(AllstatefulSets)

}

func Cluster_daemonsets(w http.ResponseWriter, r *http.Request) {

	clustername := r.URL.Query().Get("Name")
	namespace := r.URL.Query().Get("Namespace")

	if clustername == "" {
		http.Error(w, "Missing 'Name' parameter", http.StatusBadRequest)
		return
	}

	clientset, err := getClientset(w, clustername)

	if err != nil {
		log.Fatal("Error getting clientset: ", err)
	}

	DaemonSetss, err := clientset.AppsV1().DaemonSets(namespace).List(context.TODO(), metav1.ListOptions{})

	if err != nil {
		log.Fatal("Error getting list of DaemonSets: ", err)
	}

	AllDaemonSets := []Daemonset{}

	var DaemonSets Daemonset
	for _, s := range DaemonSetss.Items {
		DaemonSets.Name = s.Name
		DaemonSets.Namespace = s.Namespace
		DaemonSets.DESIRED = string(s.Status.DesiredNumberScheduled)
		DaemonSets.CURRENT = string(s.Status.NumberReady)

		DaemonSets.Available = string(s.Status.NumberAvailable)

		AllDaemonSets = append(AllDaemonSets, DaemonSets)
	}

	//pod_list, err := json.Marshal(Allservice)
	if err != nil {
		http.Error(w, "Internal Error", http.StatusInternalServerError)
	}
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(AllDaemonSets)

}

func Cluster_deployments(w http.ResponseWriter, r *http.Request) {

	clustername := r.URL.Query().Get("Name")
	namespace := r.URL.Query().Get("Namespace")

	if clustername == "" {
		http.Error(w, "Missing 'Name' parameter", http.StatusBadRequest)
		return
	}

	clientset, err := getClientset(w, clustername)

	if err != nil {
		log.Fatal("Error getting clientset: ", err)
	}

	deployments, err := clientset.AppsV1().Deployments(namespace).List(context.TODO(), metav1.ListOptions{})

	if err != nil {
		log.Fatal("Error getting list of deployments: ", err)
	}

	Alldeployment := []Deployment{}

	var deployment Deployment
	for _, d := range deployments.Items {
		deployment.Name = d.Name
		deployment.Namespace = d.Namespace
		Alldeployment = append(Alldeployment, deployment)
	}

	if err != nil {
		http.Error(w, "Internal Error", http.StatusInternalServerError)
	}
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(Alldeployment)

}

func servicePortsToString(ports []corev1.ServicePort) string {
	var parts []string
	for _, p := range ports {
		// Example format: "80/TCP"
		parts = append(parts, fmt.Sprintf("%d/%s", p.Port, p.Protocol))
	}
	return strings.Join(parts, ", ")
}
func Cluster_pods(w http.ResponseWriter, r *http.Request) {

	clustername := r.URL.Query().Get("Name")
	namespace := r.URL.Query().Get("Namespace")

	if clustername == "" {
		http.Error(w, "Missing 'Name' parameter", http.StatusBadRequest)
		return
	}

	clientset, err := getClientset(w, clustername)

	if err != nil {
		log.Fatal("Error getting clientset: ", err)
	}

	pods, err := clientset.CoreV1().Pods(namespace).List(context.TODO(), metav1.ListOptions{})

	if err != nil {
		log.Fatal("Error getting list of pods: ", err)
	}

	Allpod := []Pod{}

	var pod Pod
	for _, p := range pods.Items {
		fmt.Printf(p.Name, p.Namespace)
		pod.Name = p.Name
		pod.Namespace = p.Namespace
		pod.Status = string(p.Status.Phase)
		Allpod = append(Allpod, pod)
	}

	//pod_list, err := json.Marshal(Allpod)
	if err != nil {
		http.Error(w, "Internal Error", http.StatusInternalServerError)
	}
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(Allpod)

}

func getClusterConfig(clustername string) (string, error) {
	var existsCluster Cluster
	err := db.Vclusters_details.FindOne(context.TODO(), bson.M{"name": clustername}).Decode(&existsCluster)
	if err != nil {
		return "", err
	}

	decoded, err := base64.StdEncoding.DecodeString(existsCluster.Cluster_config)

	return string(decoded), nil
}

func Connect(w http.ResponseWriter, r *http.Request) {

	clusterName := r.URL.Query().Get("Name")
	if clusterName == "" {
		http.Error(w, "Missing 'Name' parameter", http.StatusBadRequest)
		return
	}

	var existsCluster Cluster
	_ = db.Vclusters_details.FindOne(context.TODO(), bson.M{"name": clusterName}).Decode(&existsCluster)

	decoded, err := base64.StdEncoding.DecodeString(existsCluster.Cluster_config)
	if err != nil {
		http.Error(w, "Failed to decode cluster config", http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/x-yaml")
	w.Header().Set("Content-Disposition", `attachment; filename="`+clusterName+`.yaml"`)
	w.Write(decoded)

}

// func Cluster_details(w http.ResponseWriter, r *http.Request) {

// }

func Cluster_jobs(w http.ResponseWriter, r *http.Request) {

	clustername := r.URL.Query().Get("Name")
	namespace := r.URL.Query().Get("Namespace")

	if clustername == "" {
		http.Error(w, "Missing 'Name' parameter", http.StatusBadRequest)
		return
	}

	clientset, err := getClientset(w, clustername)

	if err != nil {
		log.Fatal("Error getting Jobs: ", err)
	}

	jobs, err := clientset.BatchV1().Jobs(namespace).List(context.TODO(), metav1.ListOptions{})

	if err != nil {
		log.Fatal("Error getting list of Jobs: ", err)
	}

	AllJob := []Jobs{}

	var job Jobs
	for _, d := range jobs.Items {
		job.Name = d.Name
		job.Namespace = d.Namespace
		AllJob = append(AllJob, job)
	}

	if err != nil {
		http.Error(w, "Internal Error", http.StatusInternalServerError)
	}
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(AllJob)

}

func Cluster_replicasets(w http.ResponseWriter, r *http.Request) {

	clustername := r.URL.Query().Get("Name")
	namespace := r.URL.Query().Get("Namespace")

	if clustername == "" {
		http.Error(w, "Missing 'Name' parameter", http.StatusBadRequest)
		return
	}

	clientset, err := getClientset(w, clustername)

	if err != nil {
		log.Fatal("Error getting replicasets: ", err)
	}

	replicasets, err := clientset.AppsV1().ReplicaSets(namespace).List(context.TODO(), metav1.ListOptions{})

	if err != nil {
		log.Fatal("Error getting list of Replicaset: ", err)
	}

	Allreplicaset := []Replicaset{}

	var replicaset Replicaset
	for _, d := range replicasets.Items {
		replicaset.Name = d.Name
		replicaset.Namespace = d.Namespace
		Allreplicaset = append(Allreplicaset, replicaset)
	}

	if err != nil {
		http.Error(w, "Internal Error", http.StatusInternalServerError)
	}
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(Allreplicaset)

}

func Cluster_replicationcontrollers(w http.ResponseWriter, r *http.Request) {

	clustername := r.URL.Query().Get("Name")
	namespace := r.URL.Query().Get("Namespace")

	if clustername == "" {
		http.Error(w, "Missing 'Name' parameter", http.StatusBadRequest)
		return
	}

	clientset, err := getClientset(w, clustername)

	if err != nil {
		log.Fatal("Error getting Replicationcontrollers: ", err)
	}

	replicationcontrollers, err := clientset.CoreV1().ReplicationControllers(namespace).List(context.TODO(), metav1.ListOptions{})

	if err != nil {
		log.Fatal("Error getting list of ReplicationController: ", err)
	}

	AllreplicationController := []ReplicationController{}

	var ReplicationController ReplicationController
	for _, d := range replicationcontrollers.Items {
		ReplicationController.Name = d.Name
		ReplicationController.Namespace = d.Namespace
		AllreplicationController = append(AllreplicationController, ReplicationController)
	}

	if err != nil {
		http.Error(w, "Internal Error", http.StatusInternalServerError)
	}
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(AllreplicationController)

}

func Cluster_cronjobs(w http.ResponseWriter, r *http.Request) {

	clustername := r.URL.Query().Get("Name")
	namespace := r.URL.Query().Get("Namespace")

	if clustername == "" {
		http.Error(w, "Missing 'Name' parameter", http.StatusBadRequest)
		return
	}

	clientset, err := getClientset(w, clustername)

	if err != nil {
		log.Fatal("Error getting Replicationcontrollers: ", err)
	}

	replicationcontrollers, err := clientset.CoreV1().ReplicationControllers(namespace).List(context.TODO(), metav1.ListOptions{})

	if err != nil {
		log.Fatal("Error getting list of ReplicationController: ", err)
	}

	AllreplicationController := []ReplicationController{}

	var ReplicationController ReplicationController
	for _, d := range replicationcontrollers.Items {
		ReplicationController.Name = d.Name
		ReplicationController.Namespace = d.Namespace
		AllreplicationController = append(AllreplicationController, ReplicationController)
	}

	if err != nil {
		http.Error(w, "Internal Error", http.StatusInternalServerError)
	}
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(AllreplicationController)

}