/*
Copyright 2014 The Kubernetes Authors All rights reserved.

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 (
	"fmt"
	"strconv"
	"time"

	"k8s.io/kubernetes/pkg/api"
	"k8s.io/kubernetes/pkg/api/v1"
	"k8s.io/kubernetes/pkg/labels"
	"k8s.io/kubernetes/pkg/util"
	"k8s.io/kubernetes/pkg/util/intstr"
	"k8s.io/kubernetes/pkg/watch"

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

var _ = Describe("Generated release_1_2 clientset", func() {
	framework := NewFramework("clientset")
	It("should create pods, delete pods, watch pods", func() {
		podClient := framework.Clientset_1_2.Core().Pods(framework.Namespace.Name)
		By("creating the pod")
		name := "pod" + string(util.NewUUID())
		value := strconv.Itoa(time.Now().Nanosecond())
		pod := &v1.Pod{
			ObjectMeta: v1.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:1.7.9",
						Ports: []v1.ContainerPort{{ContainerPort: 80}},
						LivenessProbe: &v1.Probe{
							Handler: v1.Handler{
								HTTPGet: &v1.HTTPGetAction{
									Path: "/index.html",
									Port: intstr.FromInt(8080),
								},
							},
							InitialDelaySeconds: 30,
						},
					},
				},
			},
		}

		By("setting up watch")
		selector := labels.SelectorFromSet(labels.Set(map[string]string{"time": value}))
		options := api.ListOptions{LabelSelector: selector}
		pods, err := podClient.List(options)
		if err != nil {
			Failf("Failed to query for pods: %v", err)
		}
		Expect(len(pods.Items)).To(Equal(0))
		options = api.ListOptions{
			LabelSelector:   selector,
			ResourceVersion: pods.ListMeta.ResourceVersion,
		}
		w, err := podClient.Watch(options)
		if err != nil {
			Failf("Failed to set up watch: %v", err)
		}

		By("submitting the pod to kubernetes")
		// We call defer here in case there is a problem with
		// the test so we can ensure that we clean up after
		// ourselves
		defer podClient.Delete(pod.Name, api.NewDeleteOptions(0))
		pod, err = podClient.Create(pod)
		if err != nil {
			Failf("Failed to create pod: %v", err)
		}

		By("verifying the pod is in kubernetes")
		selector = labels.SelectorFromSet(labels.Set(map[string]string{"time": value}))
		options = api.ListOptions{
			LabelSelector:   selector,
			ResourceVersion: pod.ResourceVersion,
		}
		pods, err = podClient.List(options)
		if err != nil {
			Failf("Failed to query for pods: %v", err)
		}
		Expect(len(pods.Items)).To(Equal(1))

		By("verifying pod creation was observed")
		select {
		case event, _ := <-w.ResultChan():
			if event.Type != watch.Added {
				Failf("Failed to observe pod creation: %v", event)
			}
		case <-time.After(podStartTimeout):
			Fail("Timeout while waiting for pod creation")
		}

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

		By("deleting the pod gracefully")
		if err := podClient.Delete(pod.Name, api.NewDeleteOptions(30)); err != nil {
			Failf("Failed to delete pod: %v", err)
		}

		By("verifying pod deletion was observed")
		deleted := false
		timeout := false
		var lastPod *api.Pod
		timer := time.After(30 * time.Second)
		for !deleted && !timeout {
			select {
			case event, _ := <-w.ResultChan():
				if event.Type == watch.Deleted {
					lastPod = event.Object.(*api.Pod)
					deleted = true
				}
			case <-timer:
				timeout = true
			}
		}
		if !deleted {
			Fail("Failed to observe pod deletion")
		}

		Expect(lastPod.DeletionTimestamp).ToNot(BeNil())
		Expect(lastPod.Spec.TerminationGracePeriodSeconds).ToNot(BeZero())

		selector = labels.SelectorFromSet(labels.Set(map[string]string{"time": value}))
		options = api.ListOptions{LabelSelector: selector}
		pods, err = podClient.List(options)
		if err != nil {
			Fail(fmt.Sprintf("Failed to list pods to verify deletion: %v", err))
		}
		Expect(len(pods.Items)).To(Equal(0))
	})
})
