/*
Copyright 2015 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 volume

import (
	"fmt"
	"strings"
	"testing"

	"k8s.io/kubernetes/pkg/api"
	"k8s.io/kubernetes/pkg/api/errors"
	"k8s.io/kubernetes/pkg/api/resource"
)

func TestRecyclerSuccess(t *testing.T) {
	client := &mockRecyclerClient{}
	recycler := &api.Pod{
		ObjectMeta: api.ObjectMeta{
			Namespace: api.NamespaceDefault,
		},
		Status: api.PodStatus{
			Phase: api.PodSucceeded,
		},
	}

	err := internalRecycleVolumeByWatchingPodUntilCompletion("pv-name", recycler, client)
	if err != nil {
		t.Errorf("Unexpected error watching recycler pod: %+v", err)
	}
	if !client.deletedCalled {
		t.Errorf("Expected deferred client.Delete to be called on recycler pod")
	}
}

func TestRecyclerFailure(t *testing.T) {
	client := &mockRecyclerClient{}
	recycler := &api.Pod{
		ObjectMeta: api.ObjectMeta{
			Namespace: api.NamespaceDefault,
		},
		Status: api.PodStatus{
			Phase:   api.PodFailed,
			Message: "foo",
		},
	}

	err := internalRecycleVolumeByWatchingPodUntilCompletion("pv-name", recycler, client)
	if err == nil {
		t.Fatalf("Expected pod failure but got nil error returned")
	}
	if err != nil {
		if !strings.Contains(err.Error(), "foo") {
			t.Errorf("Expected pod.Status.Message %s but got %s", recycler.Status.Message, err)
		}
	}
	if !client.deletedCalled {
		t.Errorf("Expected deferred client.Delete to be called on recycler pod")
	}
}

func TestRecyclerAlreadyExists(t *testing.T) {
	// Test that internalRecycleVolumeByWatchingPodUntilCompletion does not
	// start a new recycler when an old one is already running.

	// Old recycler is running and fails with "foo" error message
	oldRecycler := &api.Pod{
		ObjectMeta: api.ObjectMeta{
			Name:      "recycler-test",
			Namespace: api.NamespaceDefault,
		},
		Status: api.PodStatus{
			Phase:   api.PodFailed,
			Message: "foo",
		},
	}

	// New recycler _would_ succeed if it was run
	newRecycler := &api.Pod{
		ObjectMeta: api.ObjectMeta{
			Name:      "recycler-test",
			Namespace: api.NamespaceDefault,
		},
		Status: api.PodStatus{
			Phase:   api.PodSucceeded,
			Message: "bar",
		},
	}

	client := &mockRecyclerClient{
		pod: oldRecycler,
	}

	err := internalRecycleVolumeByWatchingPodUntilCompletion("pv-name", newRecycler, client)
	if err == nil {
		t.Fatalf("Expected pod failure but got nil error returned")
	}

	// Check the recycler failed with "foo" error message, i.e. it was the
	// old recycler that finished and not the new one.
	if err != nil {
		if !strings.Contains(err.Error(), "foo") {
			t.Errorf("Expected pod.Status.Message %s but got %s", oldRecycler.Status.Message, err)
		}
	}
	if !client.deletedCalled {
		t.Errorf("Expected deferred client.Delete to be called on recycler pod")
	}
}

type mockRecyclerClient struct {
	pod           *api.Pod
	deletedCalled bool
}

func (c *mockRecyclerClient) CreatePod(pod *api.Pod) (*api.Pod, error) {
	if c.pod == nil {
		c.pod = pod
		return c.pod, nil
	}
	// Simulate "already exists" error
	return nil, errors.NewAlreadyExists(api.Resource("pods"), pod.Name)
}

func (c *mockRecyclerClient) GetPod(name, namespace string) (*api.Pod, error) {
	if c.pod != nil {
		return c.pod, nil
	} else {
		return nil, fmt.Errorf("pod does not exist")
	}
}

func (c *mockRecyclerClient) DeletePod(name, namespace string) error {
	c.deletedCalled = true
	return nil
}

func (c *mockRecyclerClient) WatchPod(name, namespace string, stopChannel chan struct{}) func() *api.Pod {
	return func() *api.Pod {
		return c.pod
	}
}

func TestCalculateTimeoutForVolume(t *testing.T) {
	pv := &api.PersistentVolume{
		Spec: api.PersistentVolumeSpec{
			Capacity: api.ResourceList{
				api.ResourceName(api.ResourceStorage): resource.MustParse("500M"),
			},
		},
	}

	timeout := CalculateTimeoutForVolume(50, 30, pv)
	if timeout != 50 {
		t.Errorf("Expected 50 for timeout but got %v", timeout)
	}

	pv.Spec.Capacity[api.ResourceStorage] = resource.MustParse("2Gi")
	timeout = CalculateTimeoutForVolume(50, 30, pv)
	if timeout != 60 {
		t.Errorf("Expected 60 for timeout but got %v", timeout)
	}

	pv.Spec.Capacity[api.ResourceStorage] = resource.MustParse("150Gi")
	timeout = CalculateTimeoutForVolume(50, 30, pv)
	if timeout != 4500 {
		t.Errorf("Expected 4500 for timeout but got %v", timeout)
	}
}

func TestGenerateVolumeName(t *testing.T) {

	// Normal operation, no truncate
	v1 := GenerateVolumeName("kubernetes", "pv-cinder-abcde", 255)
	if v1 != "kubernetes-dynamic-pv-cinder-abcde" {
		t.Errorf("Expected kubernetes-dynamic-pv-cinder-abcde, got %s", v1)
	}

	// Truncate trailing "6789-dynamic"
	prefix := strings.Repeat("0123456789", 9) // 90 characters prefix + 8 chars. of "-dynamic"
	v2 := GenerateVolumeName(prefix, "pv-cinder-abcde", 100)
	expect := prefix[:84] + "-pv-cinder-abcde"
	if v2 != expect {
		t.Errorf("Expected %s, got %s", expect, v2)
	}

	// Truncate really long cluster name
	prefix = strings.Repeat("0123456789", 1000) // 10000 characters prefix
	v3 := GenerateVolumeName(prefix, "pv-cinder-abcde", 100)
	if v3 != expect {
		t.Errorf("Expected %s, got %s", expect, v3)
	}

}