/*
Copyright 2016 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 (
	"fmt"
	"os"
	"strings"
	"time"

	"k8s.io/kubernetes/pkg/api"
	"k8s.io/kubernetes/pkg/api/errors"
	api_v1 "k8s.io/kubernetes/pkg/api/v1"
	"k8s.io/kubernetes/pkg/util/wait"
	"k8s.io/kubernetes/test/e2e/framework"

	. "github.com/onsi/ginkgo"
)

const (
	namespacePrefix = "e2e-namespace-test-"
)

// Create/delete ingress api objects
var _ = framework.KubeDescribe("Federation namespace [Feature:Federation]", func() {
	f := framework.NewDefaultFederatedFramework("federation-namespace")

	Describe("Namespace objects", func() {
		var federationName string
		var clusters map[string]*cluster // All clusters, keyed by cluster name
		var nsName string

		BeforeEach(func() {
			framework.SkipUnlessFederated(f.ClientSet)

			// TODO: Federation API server should be able to answer this.
			if federationName = os.Getenv("FEDERATION_NAME"); federationName == "" {
				federationName = DefaultFederationName
			}

			clusters = map[string]*cluster{}
			registerClusters(clusters, UserAgentName, federationName, f)
		})

		AfterEach(func() {
			framework.SkipUnlessFederated(f.ClientSet)
			deleteAllTestNamespaces(
				f.FederationClientset_1_5.Core().Namespaces().List,
				f.FederationClientset_1_5.Core().Namespaces().Delete)
			for _, cluster := range clusters {
				deleteAllTestNamespaces(
					cluster.Core().Namespaces().List,
					cluster.Core().Namespaces().Delete)
			}
			unregisterClusters(clusters, f)
		})

		It("should be created and deleted successfully", func() {
			framework.SkipUnlessFederated(f.ClientSet)

			ns := api_v1.Namespace{
				ObjectMeta: api_v1.ObjectMeta{
					Name: api.SimpleNameGenerator.GenerateName(namespacePrefix),
				},
			}
			nsName = ns.Name
			By(fmt.Sprintf("Creating namespace %s", ns.Name))
			_, err := f.FederationClientset_1_5.Core().Namespaces().Create(&ns)
			framework.ExpectNoError(err, "Failed to create namespace %s", ns.Name)

			// Check subclusters if the namespace was created there.
			By(fmt.Sprintf("Waiting for namespace %s to be created in all underlying clusters", ns.Name))
			err = wait.Poll(5*time.Second, 2*time.Minute, func() (bool, error) {
				for _, cluster := range clusters {
					_, err := cluster.Core().Namespaces().Get(ns.Name)
					if err != nil && !errors.IsNotFound(err) {
						return false, err
					}
					if err != nil {
						return false, nil
					}
				}
				return true, nil
			})
			framework.ExpectNoError(err, "Not all namespaces created")

			By(fmt.Sprintf("Deleting namespace %s", ns.Name))
			deleteAllTestNamespaces(
				f.FederationClientset_1_5.Core().Namespaces().List,
				f.FederationClientset_1_5.Core().Namespaces().Delete)
			By(fmt.Sprintf("Verifying that namespace %s was deleted from all underlying clusters", ns.Name))
			// Verify that the namespace was deleted from all underlying clusters as well.
			for clusterName, clusterClientset := range clusters {
				_, err := clusterClientset.Core().Namespaces().Get(ns.Name)
				if err == nil || !errors.IsNotFound(err) {
					framework.Failf("expected NotFound error for namespace %s in cluster %s, got error: %v", ns.Name, clusterName, err)
				}
			}
			By(fmt.Sprintf("Verified that deletion succeeded"))
		})
	})
})

func deleteAllTestNamespaces(lister func(api_v1.ListOptions) (*api_v1.NamespaceList, error), deleter func(string, *api_v1.DeleteOptions) error) {
	list, err := lister(api_v1.ListOptions{})
	if err != nil {
		framework.Failf("Failed to get all namespaes: %v", err)
		return
	}
	for _, namespace := range list.Items {
		if strings.HasPrefix(namespace.Name, namespacePrefix) {
			// Do not orphan dependents (corresponding namespaces in underlying clusters).
			orphanDependents := false
			err := deleter(namespace.Name, &api_v1.DeleteOptions{OrphanDependents: &orphanDependents})
			if err != nil {
				framework.Failf("Failed to set %s for deletion: %v", namespace.Name, err)
			}
		}
	}
	waitForNoTestNamespaces(lister)
}

func waitForNoTestNamespaces(lister func(api_v1.ListOptions) (*api_v1.NamespaceList, error)) {
	err := wait.Poll(5*time.Second, 2*time.Minute, func() (bool, error) {
		list, err := lister(api_v1.ListOptions{})
		if err != nil {
			return false, err
		}
		for _, namespace := range list.Items {
			if strings.HasPrefix(namespace.Name, namespacePrefix) {
				return false, nil
			}
		}
		return true, nil
	})
	if err != nil {
		framework.Failf("Namespaces not deleted: %v", err)
	}
}