/*
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"
	"fmt"

	"github.com/onsi/ginkgo/v2"
	"github.com/onsi/gomega"
	appsv1 "k8s.io/api/apps/v1"
	corev1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/util/rand"
	"sigs.k8s.io/controller-runtime/pkg/client"

	clusterv1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
	policyv1alpha1 "github.com/karmada-io/karmada/pkg/apis/policy/v1alpha1"
	"github.com/karmada-io/karmada/pkg/util"
	"github.com/karmada-io/karmada/test/e2e/framework"
	"github.com/karmada-io/karmada/test/helper"
)

var _ = ginkgo.Describe("propagation with fieldSelector testing", func() {
	ginkgo.Context("Deployment propagation testing", func() {
		var policyNamespace, policyName string
		var deploymentNamespace, deploymentName string
		var deployment *appsv1.Deployment
		var originalClusterProviderInfo, originalClusterRegionInfo map[string]string
		var desiredProvider, undesiredRegion []string
		var desiredScheduleResult string
		var filedSelector *policyv1alpha1.FieldSelector
		var policy *policyv1alpha1.PropagationPolicy

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

			originalClusterProviderInfo = make(map[string]string)
			originalClusterRegionInfo = make(map[string]string)
			desiredProvider = []string{"huaweicloud"}
			undesiredRegion = []string{"cn-north-1"}
			desiredScheduleResult = framework.ClusterNames()[0]

			// desire to schedule to clusters of huaweicloud but not in cn-north-1 region
			filedSelector = &policyv1alpha1.FieldSelector{
				MatchExpressions: []corev1.NodeSelectorRequirement{
					{
						Key:      util.ProviderField,
						Operator: corev1.NodeSelectorOpIn,
						Values:   desiredProvider,
					},
					{
						Key:      util.RegionField,
						Operator: corev1.NodeSelectorOpNotIn,
						Values:   undesiredRegion,
					},
				},
			}

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

		ginkgo.BeforeEach(func() {
			ginkgo.By("setting provider and region for clusters", func() {
				providerMap := []string{"huaweicloud", "huaweicloud", "kind"}
				regionMap := []string{"cn-south-1", "cn-north-1", "cn-east-1"}
				for index, cluster := range framework.ClusterNames() {
					if index > 2 {
						break
					}
					fmt.Printf("setting provider and region for cluster %v\n", cluster)
					gomega.Eventually(func(g gomega.Gomega) {
						clusterObj := &clusterv1alpha1.Cluster{}
						err := controlPlaneClient.Get(context.TODO(), client.ObjectKey{Name: cluster}, clusterObj)
						g.Expect(err).NotTo(gomega.HaveOccurred())

						originalClusterProviderInfo[cluster] = clusterObj.Spec.Provider
						originalClusterRegionInfo[cluster] = clusterObj.Spec.Region
						clusterObj.Spec.Provider = providerMap[index]
						clusterObj.Spec.Region = regionMap[index]
						err = controlPlaneClient.Update(context.TODO(), clusterObj)
						g.Expect(err).NotTo(gomega.HaveOccurred())
					}, pollTimeout, pollInterval).Should(gomega.Succeed())
				}
			})
		})

		ginkgo.AfterEach(func() {
			ginkgo.By("recovering provider and region for clusters", func() {
				for index, cluster := range framework.ClusterNames() {
					if index > 2 {
						break
					}

					gomega.Eventually(func(g gomega.Gomega) {
						clusterObj := &clusterv1alpha1.Cluster{}
						err := controlPlaneClient.Get(context.TODO(), client.ObjectKey{Name: cluster}, clusterObj)
						g.Expect(err).NotTo(gomega.HaveOccurred())

						clusterObj.Spec.Provider = originalClusterProviderInfo[cluster]
						clusterObj.Spec.Region = originalClusterRegionInfo[cluster]
						err = controlPlaneClient.Update(context.TODO(), clusterObj)
						g.Expect(err).NotTo(gomega.HaveOccurred())
					}, pollTimeout, pollInterval).Should(gomega.Succeed())
				}
			})
		})

		ginkgo.BeforeEach(func() {
			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.It("propagation with fieldSelector testing", func() {
			ginkgo.By("check whether deployment is scheduled to clusters which meeting the fieldSelector requirements", func() {
				targetClusterNames := framework.ExtractTargetClustersFrom(controlPlaneClient, deployment)
				gomega.Expect(len(targetClusterNames)).Should(gomega.Equal(1))
				gomega.Expect(targetClusterNames[0]).Should(gomega.Equal(desiredScheduleResult))
			})
		})
	})
})