/*
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 base

import (
	"fmt"
	"os"
	"time"

	"github.com/onsi/ginkgo/v2"
	"github.com/onsi/gomega"
	appsv1 "k8s.io/api/apps/v1"
	"k8s.io/apimachinery/pkg/api/meta"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/rand"
	"k8s.io/cli-runtime/pkg/genericclioptions"
	"k8s.io/klog/v2"
	"k8s.io/utils/ptr"

	clusterv1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
	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/pkg/karmadactl/join"
	"github.com/karmada-io/karmada/pkg/karmadactl/unjoin"
	cmdutil "github.com/karmada-io/karmada/pkg/karmadactl/util"
	"github.com/karmada-io/karmada/test/e2e/framework"
	testhelper "github.com/karmada-io/karmada/test/helper"
)

// reschedule testing is used to test the rescheduling situation when some initially scheduled clusters are unjoined
var _ = ginkgo.Describe("[cluster unjoined] reschedule testing", func() {
	framework.SerialContext("Deployment propagation testing", ginkgo.Label(NeedCreateCluster), func() {
		var newClusterName string
		var homeDir string
		var kubeConfigPath string
		var controlPlane string
		var clusterContext string
		var f cmdutil.Factory

		ginkgo.BeforeEach(func() {
			newClusterName = "member-e2e-" + rand.String(RandomStrLength)
			homeDir = os.Getenv("HOME")
			kubeConfigPath = fmt.Sprintf("%s/.kube/%s.config", homeDir, newClusterName)
			controlPlane = fmt.Sprintf("%s-control-plane", newClusterName)
			clusterContext = fmt.Sprintf("kind-%s", newClusterName)

			defaultConfigFlags := genericclioptions.NewConfigFlags(true).WithDeprecatedPasswordFlag().WithDiscoveryBurst(300).WithDiscoveryQPS(50.0)
			defaultConfigFlags.Context = &karmadaContext
			f = cmdutil.NewFactory(defaultConfigFlags)
		})

		ginkgo.BeforeEach(func() {
			ginkgo.By(fmt.Sprintf("Creating cluster: %s", newClusterName), func() {
				err := createCluster(newClusterName, kubeConfigPath, controlPlane, clusterContext)
				gomega.Expect(err).ShouldNot(gomega.HaveOccurred())
			})
		})

		ginkgo.AfterEach(func() {
			ginkgo.By(fmt.Sprintf("Deleting clusters: %s", newClusterName), func() {
				err := deleteCluster(newClusterName, kubeConfigPath)
				gomega.Expect(err).ShouldNot(gomega.HaveOccurred())
				_ = os.Remove(kubeConfigPath)
			})
		})

		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 = testhelper.NewDeployment(deploymentNamespace, deploymentName)
			deployment.Spec.Replicas = ptr.To[int32](10)

			policy = testhelper.NewPropagationPolicy(policyNamespace, policyName, []policyv1alpha1.ResourceSelector{
				{
					APIVersion: deployment.APIVersion,
					Kind:       deployment.Kind,
					Name:       deployment.Name,
				},
			}, policyv1alpha1.Placement{
				ReplicaScheduling: &policyv1alpha1.ReplicaSchedulingStrategy{
					ReplicaSchedulingType:     policyv1alpha1.ReplicaSchedulingTypeDivided,
					ReplicaDivisionPreference: policyv1alpha1.ReplicaDivisionPreferenceWeighted,
				},
			})
		})

		ginkgo.It("deployment reschedule testing", func() {
			ginkgo.By(fmt.Sprintf("Joining cluster: %s", newClusterName), func() {
				opts := join.CommandJoinOption{
					DryRun:            false,
					ClusterNamespace:  "karmada-cluster",
					ClusterName:       newClusterName,
					ClusterContext:    clusterContext,
					ClusterKubeConfig: kubeConfigPath,
				}
				err := opts.Run(f)
				gomega.Expect(err).ShouldNot(gomega.HaveOccurred())

				// wait for the current cluster status changing to true
				framework.WaitClusterFitWith(controlPlaneClient, newClusterName, func(cluster *clusterv1alpha1.Cluster) bool {
					return meta.IsStatusConditionPresentAndEqual(cluster.Status.Conditions, clusterv1alpha1.ClusterConditionReady, metav1.ConditionTrue)
				})
			})

			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)
			})

			targetClusterNames := framework.ExtractTargetClustersFrom(controlPlaneClient, deployment)

			ginkgo.By("unjoin target cluster", func() {
				klog.Infof("Unjoining cluster %q.", newClusterName)
				opts := unjoin.CommandUnjoinOption{
					ClusterNamespace: "karmada-cluster",
					ClusterName:      newClusterName,
					Wait:             60 * time.Second,
				}
				err := opts.Run(f)
				gomega.Expect(err).ShouldNot(gomega.HaveOccurred())
			})

			ginkgo.By("check whether the deployment is rescheduled to other available clusters", func() {
				gomega.Eventually(func(gomega.Gomega) bool {
					targetClusterNames = framework.ExtractTargetClustersFrom(controlPlaneClient, deployment)
					return testhelper.IsExclude(newClusterName, targetClusterNames)
				}, pollTimeout, pollInterval).Should(gomega.BeTrue())
			})

			ginkgo.By("check if the scheduled condition is true", func() {
				gomega.Eventually(func(g gomega.Gomega) (bool, error) {
					rb, err := getResourceBinding(deployment)
					g.Expect(err).ShouldNot(gomega.HaveOccurred())
					return meta.IsStatusConditionTrue(rb.Status.Conditions, workv1alpha2.Scheduled), nil
				}, pollTimeout, pollInterval).Should(gomega.Equal(true))
			})
		})
	})
})

// reschedule testing is used to test the rescheduling situation when some clusters are joined and recovered
var _ = ginkgo.Describe("[cluster joined] reschedule testing", func() {
	framework.SerialContext("Deployment propagation testing", ginkgo.Label(NeedCreateCluster), func() {
		var newClusterName string
		var homeDir string
		var kubeConfigPath string
		var controlPlane string
		var clusterContext string
		var initClusterNames []string
		var f cmdutil.Factory

		ginkgo.BeforeEach(func() {
			newClusterName = "member-e2e-" + rand.String(RandomStrLength)
			homeDir = os.Getenv("HOME")
			kubeConfigPath = fmt.Sprintf("%s/.kube/%s.config", homeDir, newClusterName)
			controlPlane = fmt.Sprintf("%s-control-plane", newClusterName)
			clusterContext = fmt.Sprintf("kind-%s", newClusterName)

			defaultConfigFlags := genericclioptions.NewConfigFlags(true).WithDeprecatedPasswordFlag().WithDiscoveryBurst(300).WithDiscoveryQPS(50.0)
			defaultConfigFlags.Context = &karmadaContext
			f = cmdutil.NewFactory(defaultConfigFlags)
		})

		ginkgo.BeforeEach(func() {
			ginkgo.By(fmt.Sprintf("Creating cluster: %s", newClusterName), func() {
				err := createCluster(newClusterName, kubeConfigPath, controlPlane, clusterContext)
				gomega.Expect(err).ShouldNot(gomega.HaveOccurred())
			})
		})

		ginkgo.AfterEach(func() {
			ginkgo.By(fmt.Sprintf("Unjoin clsters: %s", newClusterName), func() {
				opts := unjoin.CommandUnjoinOption{
					ClusterNamespace: "karmada-cluster",
					ClusterName:      newClusterName,
					Wait:             60 * time.Second,
				}
				err := opts.Run(f)
				gomega.Expect(err).ShouldNot(gomega.HaveOccurred())
			})
			ginkgo.By(fmt.Sprintf("Deleting clusters: %s", newClusterName), func() {
				err := deleteCluster(newClusterName, kubeConfigPath)
				gomega.Expect(err).ShouldNot(gomega.HaveOccurred())
				_ = os.Remove(kubeConfigPath)
			})
		})

		var policyNamespace, policyName string
		var deploymentNamespace, deploymentName string
		var deployment *appsv1.Deployment
		var policy *policyv1alpha1.PropagationPolicy
		ginkgo.Context("testing the ReplicaSchedulingType of the policy is Duplicated", func() {
			ginkgo.BeforeEach(func() {
				policyNamespace = testNamespace
				policyName = deploymentNamePrefix + rand.String(RandomStrLength)
				deploymentNamespace = testNamespace
				deploymentName = policyName
				deployment = testhelper.NewDeployment(deploymentNamespace, deploymentName)
				deployment.Spec.Replicas = ptr.To[int32](1)
				// set ReplicaSchedulingType=Duplicated.
				policy = testhelper.NewPropagationPolicy(policyNamespace, policyName, []policyv1alpha1.ResourceSelector{
					{
						APIVersion: deployment.APIVersion,
						Kind:       deployment.Kind,
						Name:       deployment.Name,
					},
				}, policyv1alpha1.Placement{
					ReplicaScheduling: &policyv1alpha1.ReplicaSchedulingStrategy{
						ReplicaSchedulingType: policyv1alpha1.ReplicaSchedulingTypeDuplicated,
					},
				})
			})

			ginkgo.It("when the ReplicaSchedulingType of the policy is Duplicated, reschedule testing", func() {
				ginkgo.By("create deployment and policy")
				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(fmt.Sprintf("Joining cluster: %s", newClusterName))
				opts := join.CommandJoinOption{
					DryRun:            false,
					ClusterNamespace:  "karmada-cluster",
					ClusterName:       newClusterName,
					ClusterContext:    clusterContext,
					ClusterKubeConfig: kubeConfigPath,
				}
				err := opts.Run(f)
				gomega.Expect(err).ShouldNot(gomega.HaveOccurred())

				// wait for the current cluster status changing to true
				framework.WaitClusterFitWith(controlPlaneClient, newClusterName, func(cluster *clusterv1alpha1.Cluster) bool {
					return meta.IsStatusConditionPresentAndEqual(cluster.Status.Conditions, clusterv1alpha1.ClusterConditionReady, metav1.ConditionTrue)
				})

				ginkgo.By("check whether the deployment is rescheduled to a new cluster")
				gomega.Eventually(func(gomega.Gomega) bool {
					targetClusterNames := framework.ExtractTargetClustersFrom(controlPlaneClient, deployment)
					return !testhelper.IsExclude(newClusterName, targetClusterNames)
				}, pollTimeout, pollInterval).Should(gomega.BeTrue())
			})
		})

		ginkgo.Context("testing clusterAffinity of the policy", func() {
			ginkgo.BeforeEach(func() {
				initClusterNames = []string{framework.ClusterNames()[0], framework.ClusterNames()[1], newClusterName}
				policyNamespace = testNamespace
				policyName = deploymentNamePrefix + rand.String(RandomStrLength)
				deploymentNamespace = testNamespace
				deploymentName = policyName
				deployment = testhelper.NewDeployment(deploymentNamespace, deploymentName)
				deployment.Spec.Replicas = ptr.To[int32](1)
				// set clusterAffinity for Placement.
				policy = testhelper.NewPropagationPolicy(policyNamespace, policyName, []policyv1alpha1.ResourceSelector{
					{
						APIVersion: deployment.APIVersion,
						Kind:       deployment.Kind,
						Name:       deployment.Name,
					},
				}, policyv1alpha1.Placement{
					ClusterAffinity: &policyv1alpha1.ClusterAffinity{ClusterNames: initClusterNames},
				})
			})
			ginkgo.It("when the ReplicaScheduling of the policy is nil, reschedule testing", func() {
				ginkgo.By("create deployment and policy")
				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)
				})
				gomega.Eventually(func(gomega.Gomega) bool {
					targetClusterNames := framework.ExtractTargetClustersFrom(controlPlaneClient, deployment)
					return testhelper.IsExclude(newClusterName, targetClusterNames)
				}, pollTimeout, pollInterval).Should(gomega.BeTrue())

				ginkgo.By(fmt.Sprintf("Joining cluster: %s", newClusterName))
				opts := join.CommandJoinOption{
					DryRun:            false,
					ClusterNamespace:  "karmada-cluster",
					ClusterName:       newClusterName,
					ClusterContext:    clusterContext,
					ClusterKubeConfig: kubeConfigPath,
				}
				err := opts.Run(f)
				gomega.Expect(err).ShouldNot(gomega.HaveOccurred())

				// wait for the current cluster status changing to true
				framework.WaitClusterFitWith(controlPlaneClient, newClusterName, func(cluster *clusterv1alpha1.Cluster) bool {
					return meta.IsStatusConditionPresentAndEqual(cluster.Status.Conditions, clusterv1alpha1.ClusterConditionReady, metav1.ConditionTrue)
				})

				ginkgo.By("check whether the deployment is rescheduled to a new cluster")
				gomega.Eventually(func(gomega.Gomega) bool {
					targetClusterNames := framework.ExtractTargetClustersFrom(controlPlaneClient, deployment)
					for _, clusterName := range initClusterNames {
						if testhelper.IsExclude(clusterName, targetClusterNames) {
							return false
						}
					}
					return true
				}, pollTimeout, pollInterval).Should(gomega.BeTrue())

				gomega.Eventually(func(gomega.Gomega) bool {
					targetClusterNames := framework.ExtractTargetClustersFrom(controlPlaneClient, deployment)
					return testhelper.IsExclude(framework.ClusterNames()[2], targetClusterNames)
				}, pollTimeout, pollInterval).Should(gomega.BeTrue())

			})
		})
	})
})

// reschedule testing while policy matches, triggered by label changes.
var _ = ginkgo.Describe("[cluster labels changed] reschedule testing while policy matches", func() {
	var deployment *appsv1.Deployment
	var targetMember string
	var labelKey string
	var policyNamespace string
	var policyName string

	ginkgo.BeforeEach(func() {
		targetMember = framework.ClusterNames()[0]
		policyNamespace = testNamespace
		policyName = deploymentNamePrefix + rand.String(RandomStrLength)
		labelKey = "cluster" + rand.String(RandomStrLength)

		deployment = testhelper.NewDeployment(testNamespace, policyName)
		framework.CreateDeployment(kubeClient, deployment)

		labels := map[string]string{labelKey: "ok"}
		framework.UpdateClusterLabels(karmadaClient, targetMember, labels)

		ginkgo.DeferCleanup(func() {
			framework.RemoveDeployment(kubeClient, deployment.Namespace, deployment.Name)
			framework.DeleteClusterLabels(karmadaClient, targetMember, labels)
		})
	})

	ginkgo.Context("Changes cluster labels to test reschedule while pp matches", func() {
		var policy *policyv1alpha1.PropagationPolicy

		ginkgo.BeforeEach(func() {
			policy = testhelper.NewPropagationPolicy(policyNamespace, policyName, []policyv1alpha1.ResourceSelector{
				{
					APIVersion: deployment.APIVersion,
					Kind:       deployment.Kind,
					Name:       deployment.Name,
				}}, policyv1alpha1.Placement{
				ClusterAffinity: &policyv1alpha1.ClusterAffinity{
					LabelSelector: &metav1.LabelSelector{
						MatchLabels: map[string]string{labelKey: "ok"},
					},
				},
			})
		})

		ginkgo.BeforeEach(func() {
			framework.CreatePropagationPolicy(karmadaClient, policy)

			ginkgo.DeferCleanup(func() {
				framework.RemovePropagationPolicy(karmadaClient, policy.Namespace, policy.Name)
			})

			framework.WaitDeploymentPresentOnClusterFitWith(targetMember, deployment.Namespace, deployment.Name,
				func(*appsv1.Deployment) bool { return true })
		})

		ginkgo.It("change labels to testing deployment reschedule(PropagationPolicy)", func() {
			labelsUpdate := map[string]string{labelKey: "not_ok"}
			framework.UpdateClusterLabels(karmadaClient, targetMember, labelsUpdate)
			framework.WaitDeploymentDisappearOnCluster(targetMember, deployment.Namespace, deployment.Name)

			labelsUpdate = map[string]string{labelKey: "ok"}
			framework.UpdateClusterLabels(karmadaClient, targetMember, labelsUpdate)
			framework.WaitDeploymentPresentOnClusterFitWith(targetMember, deployment.Namespace, deployment.Name,
				func(*appsv1.Deployment) bool { return true })
		})
	})

	ginkgo.Context("Changes cluster labels to test reschedule while cpp matches", func() {
		var policy *policyv1alpha1.ClusterPropagationPolicy

		ginkgo.BeforeEach(func() {
			policy = testhelper.NewClusterPropagationPolicy(policyName, []policyv1alpha1.ResourceSelector{
				{
					APIVersion: deployment.APIVersion,
					Kind:       deployment.Kind,
					Name:       deployment.Name,
				}}, policyv1alpha1.Placement{
				ClusterAffinity: &policyv1alpha1.ClusterAffinity{
					LabelSelector: &metav1.LabelSelector{
						MatchLabels: map[string]string{labelKey: "ok"},
					},
				},
			})
		})

		ginkgo.BeforeEach(func() {
			framework.CreateClusterPropagationPolicy(karmadaClient, policy)
			ginkgo.DeferCleanup(func() {
				framework.RemoveClusterPropagationPolicy(karmadaClient, policy.Name)
			})
			framework.WaitDeploymentPresentOnClusterFitWith(targetMember, deployment.Namespace, deployment.Name,
				func(*appsv1.Deployment) bool { return true })
		})

		ginkgo.It("change labels to testing deployment reschedule(ClusterPropagationPolicy)", func() {
			labelsUpdate := map[string]string{labelKey: "not_ok"}
			framework.UpdateClusterLabels(karmadaClient, targetMember, labelsUpdate)
			framework.WaitDeploymentDisappearOnCluster(targetMember, deployment.Namespace, deployment.Name)

			labelsUpdate = map[string]string{labelKey: "ok"}
			framework.UpdateClusterLabels(karmadaClient, targetMember, labelsUpdate)
			framework.WaitDeploymentPresentOnClusterFitWith(targetMember, deployment.Namespace, deployment.Name,
				func(*appsv1.Deployment) bool { return true })
		})
	})
})