/*
Copyright 2021 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 base

import (
	"context"

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

	policyv1alpha1 "github.com/karmada-io/karmada/pkg/apis/policy/v1alpha1"
	workv1alpha2 "github.com/karmada-io/karmada/pkg/apis/work/v1alpha2"
	"github.com/karmada-io/karmada/test/e2e/framework"
	"github.com/karmada-io/karmada/test/helper"
)

var _ = ginkgo.Describe("porting workloads testing", func() {
	ginkgo.Context("porting workloads from legacy clusters testing", func() {
		var policyNamespace, policyName string
		var deploymentNamespace, deploymentName string
		var deployment *appsv1.Deployment
		var policy *policyv1alpha1.PropagationPolicy

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

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

		ginkgo.It("porting Deployments from legacy clusters testing", func() {
			member1 := framework.ClusterNames()[0]
			member1Client := framework.GetClusterClient(member1)
			klog.Infof(
				"Creating deployment(%s/%s) on the member cluster %s first to simulate a scenario where the target cluster already has a deployment with the same name",
				deploymentNamespace, deploymentName, member1,
			)
			framework.CreateDeployment(member1Client, deployment)

			framework.CreatePropagationPolicy(karmadaClient, policy)
			framework.CreateDeployment(kubeClient, deployment)
			ginkgo.DeferCleanup(func() {
				framework.RemoveDeployment(kubeClient, deployment.Namespace, deployment.Name)
				framework.RemovePropagationPolicy(karmadaClient, policy.Namespace, policy.Name)
			})

			ginkgo.By("check deployment's replicas", func() {
				wantedReplicas := *deployment.Spec.Replicas * int32(len(framework.Clusters())-1)

				klog.Infof("Waiting for deployment(%s/%s) collecting status", deploymentNamespace, deploymentName)
				gomega.Eventually(func(g gomega.Gomega) (bool, error) {
					currentDeployment, err := kubeClient.AppsV1().Deployments(testNamespace).Get(context.TODO(), deploymentName, metav1.GetOptions{})
					g.Expect(err).ShouldNot(gomega.HaveOccurred())

					klog.Infof("deployment(%s/%s) readyReplicas: %d, wanted replicas: %d", deploymentNamespace, deploymentName, currentDeployment.Status.ReadyReplicas, wantedReplicas)
					if currentDeployment.Status.ReadyReplicas == wantedReplicas &&
						currentDeployment.Status.AvailableReplicas == wantedReplicas &&
						currentDeployment.Status.UpdatedReplicas == wantedReplicas &&
						currentDeployment.Status.Replicas == wantedReplicas {
						return true, nil
					}

					return false, nil
				}, pollTimeout, pollInterval).Should(gomega.Equal(true))
			})

			klog.Infof(
				"Add a ResourceConflictResolution annotation to deployment(%s/%s) to tell karmada that it needs to take over the deployment that already exists in the target cluster %s",
				deploymentNamespace, deploymentName, member1,
			)
			annotations := map[string]string{workv1alpha2.ResourceConflictResolutionAnnotation: workv1alpha2.ResourceConflictResolutionOverwrite}
			framework.UpdateDeploymentAnnotations(kubeClient, deployment, annotations)

			ginkgo.By("check deployment's replicas after applying the ResourceConflictResolution annotation", func() {
				wantedReplicas := *deployment.Spec.Replicas * int32(len(framework.Clusters()))

				klog.Infof("Waiting for deployment(%s/%s) collecting status", deploymentNamespace, deploymentName)
				gomega.Eventually(func(g gomega.Gomega) (bool, error) {
					currentDeployment, err := kubeClient.AppsV1().Deployments(testNamespace).Get(context.TODO(), deploymentName, metav1.GetOptions{})
					g.Expect(err).ShouldNot(gomega.HaveOccurred())

					klog.Infof("deployment(%s/%s) readyReplicas: %d, wanted replicas: %d", deploymentNamespace, deploymentName, currentDeployment.Status.ReadyReplicas, wantedReplicas)
					if currentDeployment.Status.ReadyReplicas == wantedReplicas &&
						currentDeployment.Status.AvailableReplicas == wantedReplicas &&
						currentDeployment.Status.UpdatedReplicas == wantedReplicas &&
						currentDeployment.Status.Replicas == wantedReplicas {
						return true, nil
					}

					return false, nil
				}, pollTimeout, pollInterval).Should(gomega.Equal(true))
			})
		})
	})
})