/*
Copyright 2023 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 e2e

import (
	"context"
	"time"

	"github.com/onsi/ginkgo/v2"
	"github.com/onsi/gomega"
	appsv1 "k8s.io/api/apps/v1"
	autoscalingv2 "k8s.io/api/autoscaling/v2"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/rand"
	"k8s.io/utils/pointer"

	policyv1alpha1 "github.com/karmada-io/karmada/pkg/apis/policy/v1alpha1"
	"github.com/karmada-io/karmada/test/e2e/framework"
	"github.com/karmada-io/karmada/test/helper"
)

var _ = ginkgo.Describe("hpa replicas synchronization testing", func() {
	ginkgo.Context("Replicas synchronization testing", func() {
		var policyNamespace, policyName string
		var namespace, deploymentName, hpaName string
		var deployment *appsv1.Deployment
		var hpa *autoscalingv2.HorizontalPodAutoscaler
		var policy *policyv1alpha1.PropagationPolicy

		ginkgo.BeforeEach(func() {
			policyNamespace = testNamespace
			namespace = testNamespace
			policyName = deploymentNamePrefix + rand.String(RandomStrLength)
			deploymentName = policyName
			hpaName = policyName

			deployment = helper.NewDeployment(namespace, deploymentName)
			deployment.Spec.Replicas = pointer.Int32(1)
			hpa = helper.NewHPA(namespace, hpaName, deploymentName)
			hpa.Spec.MinReplicas = pointer.Int32(2)

			policy = helper.NewPropagationPolicy(policyNamespace, policyName, []policyv1alpha1.ResourceSelector{
				{
					APIVersion: deployment.APIVersion,
					Kind:       deployment.Kind,
					Name:       deployment.Name,
				},
				{
					APIVersion: hpa.APIVersion,
					Kind:       hpa.Kind,
					Name:       hpa.Name,
				},
			}, policyv1alpha1.Placement{
				ClusterAffinity: &policyv1alpha1.ClusterAffinity{
					ClusterNames: framework.ClusterNames(),
				},
			})
		})

		ginkgo.BeforeEach(func() {
			framework.CreatePropagationPolicy(karmadaClient, policy)
			framework.CreateDeployment(kubeClient, deployment)
			framework.CreateHPA(kubeClient, hpa)
			ginkgo.DeferCleanup(func() {
				framework.RemovePropagationPolicy(karmadaClient, policy.Namespace, policy.Name)
				framework.RemoveDeployment(kubeClient, deployment.Namespace, deployment.Name)
				framework.RemoveHPA(kubeClient, namespace, hpa.Name)
				framework.WaitDeploymentDisappearOnClusters(framework.ClusterNames(), deployment.Namespace, deployment.Name)
			})
		})

		ginkgo.It("deployment has been scaled up and synchronized to Karmada", func() {
			framework.WaitDeploymentPresentOnClustersFitWith(framework.ClusterNames(), deployment.Namespace, deployment.Name,
				func(deployment *appsv1.Deployment) bool {
					return true
				})

			framework.WaitDeploymentPresentOnClustersFitWith(framework.ClusterNames(), deployment.Namespace, deployment.Name,
				func(deployment *appsv1.Deployment) bool {
					return *deployment.Spec.Replicas == *hpa.Spec.MinReplicas
				})

			expectedReplicas := *hpa.Spec.MinReplicas * int32(len(framework.ClusterNames()))
			gomega.Eventually(func() bool {
				deploymentExist, err := kubeClient.AppsV1().Deployments(deployment.Namespace).Get(context.TODO(), deployment.Name, metav1.GetOptions{})
				if err != nil {
					return false
				}
				return (*deploymentExist.Spec.Replicas == expectedReplicas) && (deploymentExist.Generation == deploymentExist.Status.ObservedGeneration)
			}, time.Minute, pollInterval).Should(gomega.Equal(true))
		})
	})
})