/*
Copyright 2014 The Kubernetes 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 (
	"strconv"
	"time"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/labels"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/util/intstr"
	"k8s.io/apimachinery/pkg/util/uuid"
	"k8s.io/apimachinery/pkg/util/wait"
	"k8s.io/apimachinery/pkg/watch"
	clientv1 "k8s.io/client-go/pkg/api/v1"
	"k8s.io/kubernetes/pkg/api/v1"
	batchv1 "k8s.io/kubernetes/pkg/apis/batch/v1"
	batchv2alpha1 "k8s.io/kubernetes/pkg/apis/batch/v2alpha1"
	"k8s.io/kubernetes/test/e2e/framework"

	. "github.com/onsi/ginkgo"
	. "github.com/onsi/gomega"
)

func stagingClientPod(name, value string) clientv1.Pod {
	return clientv1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Name: name,
			Labels: map[string]string{
				"name": "foo",
				"time": value,
			},
		},
		Spec: clientv1.PodSpec{
			Containers: []clientv1.Container{
				{
					Name:  "nginx",
					Image: "gcr.io/google_containers/nginx-slim:0.7",
					Ports: []clientv1.ContainerPort{{ContainerPort: 80}},
				},
			},
		},
	}
}

func testingPod(name, value string) v1.Pod {
	return v1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Name: name,
			Labels: map[string]string{
				"name": "foo",
				"time": value,
			},
		},
		Spec: v1.PodSpec{
			Containers: []v1.Container{
				{
					Name:  "nginx",
					Image: "gcr.io/google_containers/nginx-slim:0.7",
					Ports: []v1.ContainerPort{{ContainerPort: 80}},
					LivenessProbe: &v1.Probe{
						Handler: v1.Handler{
							HTTPGet: &v1.HTTPGetAction{
								Path: "/index.html",
								Port: intstr.FromInt(8080),
							},
						},
						InitialDelaySeconds: 30,
					},
				},
			},
		},
	}
}

func observeCreation(w watch.Interface) {
	select {
	case event, _ := <-w.ResultChan():
		if event.Type != watch.Added {
			framework.Failf("Failed to observe the creation: %v", event)
		}
	case <-time.After(30 * time.Second):
		framework.Failf("Timeout while waiting for observing the creation")
	}
}

func observeObjectDeletion(w watch.Interface) (obj runtime.Object) {
	// output to give us a duration to failure.  Maybe we aren't getting the
	// full timeout for some reason.  My guess would be watch failure
	framework.Logf("Starting to observe pod deletion")
	deleted := false
	timeout := false
	timer := time.After(framework.DefaultPodDeletionTimeout)
	for !deleted && !timeout {
		select {
		case event, normal := <-w.ResultChan():
			if !normal {
				framework.Failf("The channel was closed unexpectedly")
				return
			}
			if event.Type == watch.Deleted {
				obj = event.Object
				deleted = true
			}
		case <-timer:
			timeout = true
		}
	}
	if !deleted {
		framework.Failf("Failed to observe pod deletion")
	}
	return
}

func observerUpdate(w watch.Interface, expectedUpdate func(runtime.Object) bool) {
	timer := time.After(30 * time.Second)
	updated := false
	timeout := false
	for !updated && !timeout {
		select {
		case event, _ := <-w.ResultChan():
			if event.Type == watch.Modified {
				if expectedUpdate(event.Object) {
					updated = true
				}
			}
		case <-timer:
			timeout = true
		}
	}
	if !updated {
		framework.Failf("Failed to observe pod update")
	}
	return
}

var _ = framework.KubeDescribe("Generated release_1_5 clientset", func() {
	f := framework.NewDefaultFramework("clientset")
	It("should create pods, set the deletionTimestamp and deletionGracePeriodSeconds of the pod", func() {
		podClient := f.ClientSet.Core().Pods(f.Namespace.Name)
		By("constructing the pod")
		name := "pod" + string(uuid.NewUUID())
		value := strconv.Itoa(time.Now().Nanosecond())
		podCopy := testingPod(name, value)
		pod := &podCopy
		By("setting up watch")
		selector := labels.SelectorFromSet(labels.Set(map[string]string{"time": value})).String()
		options := metav1.ListOptions{LabelSelector: selector}
		pods, err := podClient.List(options)
		if err != nil {
			framework.Failf("Failed to query for pods: %v", err)
		}
		Expect(len(pods.Items)).To(Equal(0))
		options = metav1.ListOptions{
			LabelSelector:   selector,
			ResourceVersion: pods.ListMeta.ResourceVersion,
		}
		w, err := podClient.Watch(options)
		if err != nil {
			framework.Failf("Failed to set up watch: %v", err)
		}

		By("creating the pod")
		pod, err = podClient.Create(pod)
		if err != nil {
			framework.Failf("Failed to create pod: %v", err)
		}

		By("verifying the pod is in kubernetes")
		options = metav1.ListOptions{
			LabelSelector:   selector,
			ResourceVersion: pod.ResourceVersion,
		}
		pods, err = podClient.List(options)
		if err != nil {
			framework.Failf("Failed to query for pods: %v", err)
		}
		Expect(len(pods.Items)).To(Equal(1))

		By("verifying pod creation was observed")
		observeCreation(w)

		// We need to wait for the pod to be scheduled, otherwise the deletion
		// will be carried out immediately rather than gracefully.
		framework.ExpectNoError(f.WaitForPodRunning(pod.Name))

		By("deleting the pod gracefully")
		gracePeriod := int64(31)
		if err := podClient.Delete(pod.Name, metav1.NewDeleteOptions(gracePeriod)); err != nil {
			framework.Failf("Failed to delete pod: %v", err)
		}

		By("verifying the deletionTimestamp and deletionGracePeriodSeconds of the pod is set")
		observerUpdate(w, func(obj runtime.Object) bool {
			pod := obj.(*v1.Pod)
			return pod.ObjectMeta.DeletionTimestamp != nil && *pod.ObjectMeta.DeletionGracePeriodSeconds == gracePeriod
		})
	})
})

func newTestingCronJob(name string, value string) *batchv2alpha1.CronJob {
	parallelism := int32(1)
	completions := int32(1)
	return &batchv2alpha1.CronJob{
		ObjectMeta: metav1.ObjectMeta{
			Name: name,
			Labels: map[string]string{
				"time": value,
			},
		},
		Spec: batchv2alpha1.CronJobSpec{
			Schedule:          "*/1 * * * ?",
			ConcurrencyPolicy: batchv2alpha1.AllowConcurrent,
			JobTemplate: batchv2alpha1.JobTemplateSpec{
				Spec: batchv1.JobSpec{
					Parallelism: &parallelism,
					Completions: &completions,
					Template: v1.PodTemplateSpec{
						Spec: v1.PodSpec{
							RestartPolicy: v1.RestartPolicyOnFailure,
							Volumes: []v1.Volume{
								{
									Name: "data",
									VolumeSource: v1.VolumeSource{
										EmptyDir: &v1.EmptyDirVolumeSource{},
									},
								},
							},
							Containers: []v1.Container{
								{
									Name:  "c",
									Image: "gcr.io/google_containers/busybox:1.24",
									VolumeMounts: []v1.VolumeMount{
										{
											MountPath: "/data",
											Name:      "data",
										},
									},
								},
							},
						},
					},
				},
			},
		},
	}
}

var _ = framework.KubeDescribe("Generated release_1_5 clientset", func() {
	f := framework.NewDefaultFramework("clientset")
	It("should create v2alpha1 cronJobs, delete cronJobs, watch cronJobs", func() {
		var enabled bool
		groupList, err := f.ClientSet.Discovery().ServerGroups()
		framework.ExpectNoError(err)
		for _, group := range groupList.Groups {
			if group.Name == batchv2alpha1.GroupName {
				for _, version := range group.Versions {
					if version.Version == batchv2alpha1.SchemeGroupVersion.Version {
						enabled = true
						break
					}
				}
			}
		}
		if !enabled {
			framework.Logf("%s is not enabled, test skipped", batchv2alpha1.SchemeGroupVersion)
			return
		}
		cronJobClient := f.ClientSet.BatchV2alpha1().CronJobs(f.Namespace.Name)
		By("constructing the cronJob")
		name := "cronjob" + string(uuid.NewUUID())
		value := strconv.Itoa(time.Now().Nanosecond())
		cronJob := newTestingCronJob(name, value)
		By("setting up watch")
		selector := labels.SelectorFromSet(labels.Set(map[string]string{"time": value})).String()
		options := metav1.ListOptions{LabelSelector: selector}
		cronJobs, err := cronJobClient.List(options)
		if err != nil {
			framework.Failf("Failed to query for cronJobs: %v", err)
		}
		Expect(len(cronJobs.Items)).To(Equal(0))
		options = metav1.ListOptions{
			LabelSelector:   selector,
			ResourceVersion: cronJobs.ListMeta.ResourceVersion,
		}
		w, err := cronJobClient.Watch(options)
		if err != nil {
			framework.Failf("Failed to set up watch: %v", err)
		}

		By("creating the cronJob")
		cronJob, err = cronJobClient.Create(cronJob)
		if err != nil {
			framework.Failf("Failed to create cronJob: %v", err)
		}

		By("verifying the cronJob is in kubernetes")
		options = metav1.ListOptions{
			LabelSelector:   selector,
			ResourceVersion: cronJob.ResourceVersion,
		}
		cronJobs, err = cronJobClient.List(options)
		if err != nil {
			framework.Failf("Failed to query for cronJobs: %v", err)
		}
		Expect(len(cronJobs.Items)).To(Equal(1))

		By("verifying cronJob creation was observed")
		observeCreation(w)

		By("deleting the cronJob")
		if err := cronJobClient.Delete(cronJob.Name, nil); err != nil {
			framework.Failf("Failed to delete cronJob: %v", err)
		}

		options = metav1.ListOptions{LabelSelector: selector}
		cronJobs, err = cronJobClient.List(options)
		if err != nil {
			framework.Failf("Failed to list cronJobs to verify deletion: %v", err)
		}
		Expect(len(cronJobs.Items)).To(Equal(0))
	})
})

var _ = framework.KubeDescribe("Staging client repo client", func() {
	f := framework.NewDefaultFramework("clientset")
	It("should create pods, delete pods, watch pods", func() {
		podClient := f.StagingClient.Core().Pods(f.Namespace.Name)
		By("constructing the pod")
		name := "pod" + string(uuid.NewUUID())
		value := strconv.Itoa(time.Now().Nanosecond())
		podCopy := stagingClientPod(name, value)
		pod := &podCopy
		By("verifying no pod exists before the test")
		pods, err := podClient.List(metav1.ListOptions{})
		if err != nil {
			framework.Failf("Failed to query for pods: %v", err)
		}
		Expect(len(pods.Items)).To(Equal(0))
		By("creating the pod")
		pod, err = podClient.Create(pod)
		if err != nil {
			framework.Failf("Failed to create pod: %v", err)
		}

		By("verifying the pod is in kubernetes")
		timeout := 1 * time.Minute
		if err := wait.PollImmediate(time.Second, timeout, func() (bool, error) {
			pods, err = podClient.List(metav1.ListOptions{})
			if err != nil {
				return false, err
			}
			if len(pods.Items) == 1 {
				return true, nil
			}
			return false, nil
		}); err != nil {
			framework.Failf("Err : %s\n. Failed to wait for 1 pod to be created", err)
		}
	})
})