/*
Copyright 2022 The Karmada Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package util

import (
	"context"
	"fmt"

	appsv1 "k8s.io/api/apps/v1"
	corev1 "k8s.io/api/core/v1"
	rbacv1 "k8s.io/api/rbac/v1"
	apierrors "k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/client-go/kubernetes"
	"k8s.io/klog/v2"
	apiregistrationv1 "k8s.io/kube-aggregator/pkg/apis/apiregistration/v1"
	aggregator "k8s.io/kube-aggregator/pkg/client/clientset_generated/clientset"

	"github.com/karmada-io/karmada/pkg/util"
)

// CreateService creates a Service if the target resource doesn't exist.
// If the resource exists already, return directly
func CreateService(client kubernetes.Interface, service *corev1.Service) error {
	if _, err := client.CoreV1().Services(service.Namespace).Create(context.TODO(), service, metav1.CreateOptions{}); err != nil {
		if !apierrors.IsAlreadyExists(err) {
			return fmt.Errorf("unable to create Service: %v", err)
		}

		klog.Warningf("Service %s is existed, creation process will skip", service.Name)
	}
	return nil
}

// CreateOrUpdateSecret creates a Secret if the target resource doesn't exist.
// If the resource exists already, this function will update the resource instead.
func CreateOrUpdateSecret(client kubernetes.Interface, secret *corev1.Secret) error {
	if _, err := client.CoreV1().Secrets(secret.Namespace).Create(context.TODO(), secret, metav1.CreateOptions{}); err != nil {
		if !apierrors.IsAlreadyExists(err) {
			return fmt.Errorf("unable to create Secret: %v", err)
		}

		existSecret, err := client.CoreV1().Secrets(secret.Namespace).Get(context.TODO(), secret.Name, metav1.GetOptions{})
		if err != nil {
			return err
		}

		secret.ResourceVersion = existSecret.ResourceVersion

		if _, err := client.CoreV1().Secrets(secret.Namespace).Update(context.TODO(), secret, metav1.UpdateOptions{}); err != nil {
			return fmt.Errorf("unable to update Secret: %v", err)
		}
	}
	klog.V(2).Infof("Secret %s/%s has been created or updated.", secret.Namespace, secret.Name)

	return nil
}

// CreateOrUpdateDeployment creates a Deployment if the target resource doesn't exist.
// If the resource exists already, this function will update the resource instead.
func CreateOrUpdateDeployment(client kubernetes.Interface, deploy *appsv1.Deployment) error {
	if _, err := client.AppsV1().Deployments(deploy.Namespace).Create(context.TODO(), deploy, metav1.CreateOptions{}); err != nil {
		if !apierrors.IsAlreadyExists(err) {
			return fmt.Errorf("unable to create Deployment: %v", err)
		}

		existDeployment, err := client.AppsV1().Deployments(deploy.Namespace).Get(context.TODO(), deploy.Name, metav1.GetOptions{})
		if err != nil {
			return err
		}

		deploy.ResourceVersion = existDeployment.ResourceVersion

		if _, err := client.AppsV1().Deployments(deploy.Namespace).Update(context.TODO(), deploy, metav1.UpdateOptions{}); err != nil {
			return fmt.Errorf("unable to update Deployment: %v", err)
		}
	}
	klog.V(2).Infof("Deployment %s/%s has been created or updated.", deploy.Namespace, deploy.Name)

	return nil
}

// CreateOrUpdateAPIService creates a ApiService if the target resource doesn't exist.
// If the resource exists already, this function will update the resource instead.
func CreateOrUpdateAPIService(apiRegistrationClient aggregator.Interface, apiservice *apiregistrationv1.APIService) error {
	if _, err := apiRegistrationClient.ApiregistrationV1().APIServices().Create(context.TODO(), apiservice, metav1.CreateOptions{}); err != nil {
		if !apierrors.IsAlreadyExists(err) {
			return fmt.Errorf("unable to create APIService: %v", err)
		}

		existAPIService, err := apiRegistrationClient.ApiregistrationV1().APIServices().Get(context.TODO(), apiservice.Name, metav1.GetOptions{})
		if err != nil {
			return err
		}

		apiservice.ResourceVersion = existAPIService.ResourceVersion

		if _, err := apiRegistrationClient.ApiregistrationV1().APIServices().Update(context.TODO(), apiservice, metav1.UpdateOptions{}); err != nil {
			return fmt.Errorf("unable to update APIService: %v", err)
		}
	}

	klog.V(2).Infof("APIService %s has been created or updated.", apiservice.Name)
	return nil
}

// CreateOrUpdateRole creates a Role if the target resource doesn't exist.
// If the resource exists already, this function will update the resource instead.
func CreateOrUpdateRole(client kubernetes.Interface, role *rbacv1.Role) error {
	if _, err := client.RbacV1().Roles(role.Namespace).Create(context.TODO(), role, metav1.CreateOptions{}); err != nil {
		if !apierrors.IsAlreadyExists(err) {
			return fmt.Errorf("unable to create RBAC role: %v", err)
		}

		existRole, err := client.RbacV1().Roles(role.Namespace).Get(context.TODO(), role.Name, metav1.GetOptions{})
		if err != nil {
			return err
		}

		role.ResourceVersion = existRole.ResourceVersion

		if _, err := client.RbacV1().Roles(role.Namespace).Update(context.TODO(), role, metav1.UpdateOptions{}); err != nil {
			return fmt.Errorf("unable to update RBAC role: %v", err)
		}
	}
	klog.V(2).Infof("Role %s/%s has been created or updated.", role.Namespace, role.Name)

	return nil
}

// CreateOrUpdateRoleBinding creates a RoleBinding if the target resource doesn't exist.
// If the resource exists already, this function will update the resource instead.
func CreateOrUpdateRoleBinding(client kubernetes.Interface, roleBinding *rbacv1.RoleBinding) error {
	if _, err := client.RbacV1().RoleBindings(roleBinding.Namespace).Create(context.TODO(), roleBinding, metav1.CreateOptions{}); err != nil {
		if !apierrors.IsAlreadyExists(err) {
			return fmt.Errorf("unable to create RBAC rolebinding: %v", err)
		}

		existRoleBinding, err := client.RbacV1().RoleBindings(roleBinding.Namespace).Get(context.TODO(), roleBinding.Name, metav1.GetOptions{})
		if err != nil {
			return err
		}

		roleBinding.ResourceVersion = existRoleBinding.ResourceVersion

		if _, err := client.RbacV1().RoleBindings(roleBinding.Namespace).Update(context.TODO(), roleBinding, metav1.UpdateOptions{}); err != nil {
			return fmt.Errorf("unable to update RBAC rolebinding: %v", err)
		}
	}
	klog.V(2).Infof("RoleBinding %s/%s has been created or updated.", roleBinding.Namespace, roleBinding.Name)

	return nil
}

// CreateOrUpdateClusterRole creates a ClusterRole if the target resource doesn't exist.
// If the resource exists already, this function will update the resource instead.
func CreateOrUpdateClusterRole(client kubernetes.Interface, clusterRole *rbacv1.ClusterRole) error {
	if _, err := client.RbacV1().ClusterRoles().Create(context.TODO(), clusterRole, metav1.CreateOptions{}); err != nil {
		if !apierrors.IsAlreadyExists(err) {
			return fmt.Errorf("unable to create ClusterRole: %v", err)
		}

		existClusterRole, err := client.RbacV1().ClusterRoles().Get(context.TODO(), clusterRole.Name, metav1.GetOptions{})
		if err != nil {
			return err
		}

		clusterRole.ResourceVersion = existClusterRole.ResourceVersion

		if _, err := client.RbacV1().ClusterRoles().Update(context.TODO(), clusterRole, metav1.UpdateOptions{}); err != nil {
			return fmt.Errorf("unable to update ClusterRole: %v", err)
		}
	}
	klog.V(2).Infof("ClusterRole %s has been created or updated.", clusterRole.Name)

	return nil
}

// CreateOrUpdateClusterRoleBinding creates a ClusterRoleBinding if the target resource doesn't exist.
// If the resource exists already, this function will update the resource instead.
func CreateOrUpdateClusterRoleBinding(client kubernetes.Interface, clusterRoleBinding *rbacv1.ClusterRoleBinding) error {
	if _, err := client.RbacV1().ClusterRoleBindings().Create(context.TODO(), clusterRoleBinding, metav1.CreateOptions{}); err != nil {
		if !apierrors.IsAlreadyExists(err) {
			return fmt.Errorf("unable to create ClusterRoleBinding: %v", err)
		}

		existCrb, err := client.RbacV1().ClusterRoleBindings().Get(context.TODO(), clusterRoleBinding.Name, metav1.GetOptions{})
		if err != nil {
			return err
		}

		clusterRoleBinding.ResourceVersion = existCrb.ResourceVersion

		if _, err := client.RbacV1().ClusterRoleBindings().Update(context.TODO(), clusterRoleBinding, metav1.UpdateOptions{}); err != nil {
			return fmt.Errorf("unable to update ClusterRolebinding: %v", err)
		}
	}
	klog.V(2).Infof("ClusterRolebinding %s has been created or updated.", clusterRoleBinding.Name)

	return nil
}

// CreateOrUpdateConfigMap creates a ConfigMap if the target resource doesn't exist.
// If the resource exists already, this function will update the resource instead.
func CreateOrUpdateConfigMap(client kubernetes.Interface, cm *corev1.ConfigMap) error {
	if _, err := client.CoreV1().ConfigMaps(cm.Namespace).Create(context.TODO(), cm, metav1.CreateOptions{}); err != nil {
		if !apierrors.IsAlreadyExists(err) {
			return fmt.Errorf("unable to create ConfigMap: %v", err)
		}

		existCm, err := client.CoreV1().ConfigMaps(cm.Namespace).Get(context.TODO(), cm.Name, metav1.GetOptions{})
		if err != nil {
			return err
		}

		cm.ResourceVersion = existCm.ResourceVersion

		if _, err := client.CoreV1().ConfigMaps(cm.Namespace).Update(context.TODO(), cm, metav1.UpdateOptions{}); err != nil {
			return fmt.Errorf("unable to update ConfigMap: %v", err)
		}
	}
	klog.V(2).Infof("ConfigMap %s/%s has been created or updated.", cm.Namespace, cm.Name)

	return nil
}

// NewNamespace generates a new Namespace by given name.
func NewNamespace(name string) *corev1.Namespace {
	return &corev1.Namespace{
		ObjectMeta: metav1.ObjectMeta{
			Name: name,
			Labels: map[string]string{
				util.KarmadaSystemLabel: util.KarmadaSystemLabelValue,
			},
		},
	}
}

// CreateOrUpdateNamespace creates a Namespaces if the target resource doesn't exist.
// If the resource exists already, this function will update the resource instead.
func CreateOrUpdateNamespace(client kubernetes.Interface, ns *corev1.Namespace) error {
	if _, err := client.CoreV1().Namespaces().Create(context.TODO(), ns, metav1.CreateOptions{}); err != nil {
		if !apierrors.IsAlreadyExists(err) {
			return fmt.Errorf("unable to create Namespace: %v", err)
		}

		existNs, err := client.CoreV1().Namespaces().Get(context.TODO(), ns.Name, metav1.GetOptions{})
		if err != nil {
			return err
		}

		ns.ResourceVersion = existNs.ResourceVersion

		if _, err := client.CoreV1().Namespaces().Update(context.TODO(), ns, metav1.UpdateOptions{}); err != nil {
			return fmt.Errorf("unable to update Namespace: %v", err)
		}
	}
	klog.Infof("Namespace %s has been created or updated.", ns.Name)

	return nil
}

// CreateOrUpdateService creates a Service if the target resource doesn't exist.
// If the resource exists already, this function will update the resource instead.
func CreateOrUpdateService(client kubernetes.Interface, svc *corev1.Service) error {
	if _, err := client.CoreV1().Services(svc.Namespace).Create(context.TODO(), svc, metav1.CreateOptions{}); err != nil {
		if !apierrors.IsAlreadyExists(err) {
			return fmt.Errorf("unable to create Service: %v", err)
		}

		existSvc, err := client.CoreV1().Services(svc.Namespace).Get(context.TODO(), svc.Name, metav1.GetOptions{})
		if err != nil {
			return err
		}

		svc.ResourceVersion = existSvc.ResourceVersion

		if _, err := client.CoreV1().Services(svc.Namespace).Update(context.TODO(), svc, metav1.UpdateOptions{}); err != nil {
			return fmt.Errorf("unable to update Service: %v", err)
		}
	}
	klog.Infof("Service %s/%s has been created or updated.", svc.Namespace, svc.Name)

	return nil
}