/*
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 iscsi

import (
	"fmt"
	"os"
	"testing"

	"k8s.io/apimachinery/pkg/types"
	"k8s.io/kubernetes/pkg/api/v1"
	"k8s.io/kubernetes/pkg/client/clientset_generated/clientset/fake"
	"k8s.io/kubernetes/pkg/util/mount"
	utiltesting "k8s.io/kubernetes/pkg/util/testing"
	"k8s.io/kubernetes/pkg/volume"
	volumetest "k8s.io/kubernetes/pkg/volume/testing"
)

func TestCanSupport(t *testing.T) {
	tmpDir, err := utiltesting.MkTmpdir("iscsi_test")
	if err != nil {
		t.Fatalf("error creating temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	plugMgr := volume.VolumePluginMgr{}
	plugMgr.InitPlugins(ProbeVolumePlugins(), volumetest.NewFakeVolumeHost(tmpDir, nil, nil))

	plug, err := plugMgr.FindPluginByName("kubernetes.io/iscsi")
	if err != nil {
		t.Errorf("Can't find the plugin by name")
	}
	if plug.GetPluginName() != "kubernetes.io/iscsi" {
		t.Errorf("Wrong name: %s", plug.GetPluginName())
	}
	if plug.CanSupport(&volume.Spec{Volume: &v1.Volume{VolumeSource: v1.VolumeSource{}}}) {
		t.Errorf("Expected false")
	}
}

func TestGetAccessModes(t *testing.T) {
	tmpDir, err := utiltesting.MkTmpdir("iscsi_test")
	if err != nil {
		t.Fatalf("error creating temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	plugMgr := volume.VolumePluginMgr{}
	plugMgr.InitPlugins(ProbeVolumePlugins(), volumetest.NewFakeVolumeHost(tmpDir, nil, nil))

	plug, err := plugMgr.FindPersistentPluginByName("kubernetes.io/iscsi")
	if err != nil {
		t.Errorf("Can't find the plugin by name")
	}
	if !contains(plug.GetAccessModes(), v1.ReadWriteOnce) || !contains(plug.GetAccessModes(), v1.ReadOnlyMany) {
		t.Errorf("Expected two AccessModeTypes:  %s and %s", v1.ReadWriteOnce, v1.ReadOnlyMany)
	}
}

func contains(modes []v1.PersistentVolumeAccessMode, mode v1.PersistentVolumeAccessMode) bool {
	for _, m := range modes {
		if m == mode {
			return true
		}
	}
	return false
}

type fakeDiskManager struct {
	tmpDir       string
	attachCalled bool
	detachCalled bool
}

func NewFakeDiskManager() *fakeDiskManager {
	return &fakeDiskManager{
		tmpDir: utiltesting.MkTmpdirOrDie("fc_test"),
	}
}

func (fake *fakeDiskManager) Cleanup() {
	os.RemoveAll(fake.tmpDir)
}

func (fake *fakeDiskManager) MakeGlobalPDName(disk iscsiDisk) string {
	return fake.tmpDir
}
func (fake *fakeDiskManager) AttachDisk(b iscsiDiskMounter) error {
	globalPath := b.manager.MakeGlobalPDName(*b.iscsiDisk)
	err := os.MkdirAll(globalPath, 0750)
	if err != nil {
		return err
	}
	// Simulate the global mount so that the fakeMounter returns the
	// expected number of mounts for the attached disk.
	b.mounter.Mount(globalPath, globalPath, b.fsType, nil)

	fake.attachCalled = true
	return nil
}

func (fake *fakeDiskManager) DetachDisk(c iscsiDiskUnmounter, mntPath string) error {
	globalPath := c.manager.MakeGlobalPDName(*c.iscsiDisk)
	err := os.RemoveAll(globalPath)
	if err != nil {
		return err
	}
	fake.detachCalled = true
	return nil
}

func doTestPlugin(t *testing.T, spec *volume.Spec) {
	tmpDir, err := utiltesting.MkTmpdir("iscsi_test")
	if err != nil {
		t.Fatalf("error creating temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	plugMgr := volume.VolumePluginMgr{}
	plugMgr.InitPlugins(ProbeVolumePlugins(), volumetest.NewFakeVolumeHost(tmpDir, nil, nil))

	plug, err := plugMgr.FindPluginByName("kubernetes.io/iscsi")
	if err != nil {
		t.Errorf("Can't find the plugin by name")
	}
	fakeManager := NewFakeDiskManager()
	defer fakeManager.Cleanup()
	fakeMounter := &mount.FakeMounter{}
	mounter, err := plug.(*iscsiPlugin).newMounterInternal(spec, types.UID("poduid"), fakeManager, fakeMounter)
	if err != nil {
		t.Errorf("Failed to make a new Mounter: %v", err)
	}
	if mounter == nil {
		t.Error("Got a nil Mounter")
	}

	path := mounter.GetPath()
	expectedPath := fmt.Sprintf("%s/pods/poduid/volumes/kubernetes.io~iscsi/vol1", tmpDir)
	if path != expectedPath {
		t.Errorf("Unexpected path, expected %q, got: %q", expectedPath, path)
	}

	if err := mounter.SetUp(nil); err != nil {
		t.Errorf("Expected success, got: %v", err)
	}
	if _, err := os.Stat(path); err != nil {
		if os.IsNotExist(err) {
			t.Errorf("SetUp() failed, volume path not created: %s", path)
		} else {
			t.Errorf("SetUp() failed: %v", err)
		}
	}
	if _, err := os.Stat(path); err != nil {
		if os.IsNotExist(err) {
			t.Errorf("SetUp() failed, volume path not created: %s", path)
		} else {
			t.Errorf("SetUp() failed: %v", err)
		}
	}
	if !fakeManager.attachCalled {
		t.Errorf("Attach was not called")
	}

	fakeManager2 := NewFakeDiskManager()
	defer fakeManager2.Cleanup()
	unmounter, err := plug.(*iscsiPlugin).newUnmounterInternal("vol1", types.UID("poduid"), fakeManager2, fakeMounter)
	if err != nil {
		t.Errorf("Failed to make a new Unmounter: %v", err)
	}
	if unmounter == nil {
		t.Error("Got a nil Unmounter")
	}

	if err := unmounter.TearDown(); err != nil {
		t.Errorf("Expected success, got: %v", err)
	}
	if _, err := os.Stat(path); err == nil {
		t.Errorf("TearDown() failed, volume path still exists: %s", path)
	} else if !os.IsNotExist(err) {
		t.Errorf("SetUp() failed: %v", err)
	}
	if !fakeManager2.detachCalled {
		t.Errorf("Detach was not called")
	}
}

func TestPluginVolume(t *testing.T) {
	vol := &v1.Volume{
		Name: "vol1",
		VolumeSource: v1.VolumeSource{
			ISCSI: &v1.ISCSIVolumeSource{
				TargetPortal: "127.0.0.1:3260",
				IQN:          "iqn.2014-12.server:storage.target01",
				FSType:       "ext4",
				Lun:          0,
			},
		},
	}
	doTestPlugin(t, volume.NewSpecFromVolume(vol))
}

func TestPluginPersistentVolume(t *testing.T) {
	vol := &v1.PersistentVolume{
		ObjectMeta: v1.ObjectMeta{
			Name: "vol1",
		},
		Spec: v1.PersistentVolumeSpec{
			PersistentVolumeSource: v1.PersistentVolumeSource{
				ISCSI: &v1.ISCSIVolumeSource{
					TargetPortal: "127.0.0.1:3260",
					IQN:          "iqn.2014-12.server:storage.target01",
					FSType:       "ext4",
					Lun:          0,
				},
			},
		},
	}
	doTestPlugin(t, volume.NewSpecFromPersistentVolume(vol, false))
}

func TestPersistentClaimReadOnlyFlag(t *testing.T) {
	tmpDir, err := utiltesting.MkTmpdir("iscsi_test")
	if err != nil {
		t.Fatalf("error creating temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	pv := &v1.PersistentVolume{
		ObjectMeta: v1.ObjectMeta{
			Name: "pvA",
		},
		Spec: v1.PersistentVolumeSpec{
			PersistentVolumeSource: v1.PersistentVolumeSource{
				ISCSI: &v1.ISCSIVolumeSource{
					TargetPortal: "127.0.0.1:3260",
					IQN:          "iqn.2014-12.server:storage.target01",
					FSType:       "ext4",
					Lun:          0,
				},
			},
			ClaimRef: &v1.ObjectReference{
				Name: "claimA",
			},
		},
	}

	claim := &v1.PersistentVolumeClaim{
		ObjectMeta: v1.ObjectMeta{
			Name:      "claimA",
			Namespace: "nsA",
		},
		Spec: v1.PersistentVolumeClaimSpec{
			VolumeName: "pvA",
		},
		Status: v1.PersistentVolumeClaimStatus{
			Phase: v1.ClaimBound,
		},
	}

	client := fake.NewSimpleClientset(pv, claim)

	plugMgr := volume.VolumePluginMgr{}
	plugMgr.InitPlugins(ProbeVolumePlugins(), volumetest.NewFakeVolumeHost(tmpDir, client, nil))
	plug, _ := plugMgr.FindPluginByName(iscsiPluginName)

	// readOnly bool is supplied by persistent-claim volume source when its mounter creates other volumes
	spec := volume.NewSpecFromPersistentVolume(pv, true)
	pod := &v1.Pod{ObjectMeta: v1.ObjectMeta{UID: types.UID("poduid")}}
	mounter, _ := plug.NewMounter(spec, pod, volume.VolumeOptions{})

	if !mounter.GetAttributes().ReadOnly {
		t.Errorf("Expected true for mounter.IsReadOnly")
	}
}

func TestPortalMounter(t *testing.T) {
	if portal := portalMounter("127.0.0.1"); portal != "127.0.0.1:3260" {
		t.Errorf("wrong portal: %s", portal)
	}
	if portal := portalMounter("127.0.0.1:3260"); portal != "127.0.0.1:3260" {
		t.Errorf("wrong portal: %s", portal)
	}
}