/*
Copyright 2019 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 csimigration

import (
	"fmt"
	"testing"

	v1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/util/version"
	utilfeature "k8s.io/apiserver/pkg/util/feature"
	"k8s.io/component-base/featuregate"
	featuregatetesting "k8s.io/component-base/featuregate/testing"
	csitrans "k8s.io/csi-translation-lib"
	"k8s.io/kubernetes/pkg/features"
	"k8s.io/kubernetes/pkg/volume"
)

func TestIsMigratable(t *testing.T) {
	testCases := []struct {
		name                 string
		pluginFeature        featuregate.Feature
		pluginFeatureEnabled bool
		csiMigrationEnabled  bool
		isMigratable         bool
		spec                 *volume.Spec
	}{
		{
			name:                 "Portworx PV source with CSIMigrationPortworx enabled",
			pluginFeature:        features.CSIMigrationPortworx,
			pluginFeatureEnabled: true,
			isMigratable:         true,
			csiMigrationEnabled:  true,
			spec: &volume.Spec{
				PersistentVolume: &v1.PersistentVolume{
					Spec: v1.PersistentVolumeSpec{
						PersistentVolumeSource: v1.PersistentVolumeSource{
							PortworxVolume: &v1.PortworxVolumeSource{
								VolumeID: "test-volume",
							},
						},
					},
				},
			},
		},
		{
			name:                 "Portworx PD PV Source with CSIMigrationPortworx disabled",
			pluginFeature:        features.CSIMigrationPortworx,
			pluginFeatureEnabled: false,
			isMigratable:         false,
			csiMigrationEnabled:  true,
			spec: &volume.Spec{
				PersistentVolume: &v1.PersistentVolume{
					Spec: v1.PersistentVolumeSpec{
						PersistentVolumeSource: v1.PersistentVolumeSource{
							PortworxVolume: &v1.PortworxVolumeSource{
								VolumeID: "test-volume",
							},
						},
					},
				},
			},
		},
	}
	csiTranslator := csitrans.New()
	for _, test := range testCases {
		pm := NewPluginManager(csiTranslator, utilfeature.DefaultFeatureGate)
		t.Run(fmt.Sprintf("Testing %v", test.name), func(t *testing.T) {
			// TODO: this will be removed in 1.36
			featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, utilfeature.DefaultFeatureGate, version.MustParse("1.32"))
			featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, test.pluginFeature, test.pluginFeatureEnabled)
			migratable, err := pm.IsMigratable(test.spec)
			if migratable != test.isMigratable {
				t.Errorf("Expected migratability of spec: %v does not match obtained migratability: %v", test.isMigratable, migratable)
			}
			if err != nil {
				t.Errorf("Unexpected error: %v", err)
			}
		})
	}
}

func TestMigrationFeatureFlagStatus(t *testing.T) {
	testCases := []struct {
		name                          string
		pluginName                    string
		pluginFeature                 featuregate.Feature
		pluginFeatureEnabled          bool
		inTreePluginUnregister        featuregate.Feature
		inTreePluginUnregisterEnabled bool
		csiMigrationResult            bool
		csiMigrationCompleteResult    bool
	}{
		{
			name:                          "portworx-volume migration flag disabled and migration-complete flag disabled with CSI migration flag",
			pluginName:                    "kubernetes.io/portworx-volume",
			pluginFeature:                 features.CSIMigrationPortworx,
			pluginFeatureEnabled:          false,
			inTreePluginUnregister:        features.InTreePluginPortworxUnregister,
			inTreePluginUnregisterEnabled: false,
			csiMigrationResult:            false,
			csiMigrationCompleteResult:    false,
		},
		{
			name:                          "portworx-volume migration flag disabled and migration-complete flag enabled with CSI migration flag",
			pluginName:                    "kubernetes.io/portworx-volume",
			pluginFeature:                 features.CSIMigrationPortworx,
			pluginFeatureEnabled:          false,
			inTreePluginUnregister:        features.InTreePluginPortworxUnregister,
			inTreePluginUnregisterEnabled: true,
			csiMigrationResult:            false,
			csiMigrationCompleteResult:    false,
		},
		{
			name:                          "portworx-volume migration flag enabled and migration-complete flag disabled with CSI migration flag",
			pluginName:                    "kubernetes.io/portworx-volume",
			pluginFeature:                 features.CSIMigrationPortworx,
			pluginFeatureEnabled:          true,
			inTreePluginUnregister:        features.InTreePluginPortworxUnregister,
			inTreePluginUnregisterEnabled: false,
			csiMigrationResult:            true,
			csiMigrationCompleteResult:    false,
		},
		{
			name:                          "portworx-volume migration flag enabled and migration-complete flag enabled with CSI migration flag",
			pluginName:                    "kubernetes.io/portworx-volume",
			pluginFeature:                 features.CSIMigrationPortworx,
			pluginFeatureEnabled:          true,
			inTreePluginUnregister:        features.InTreePluginPortworxUnregister,
			inTreePluginUnregisterEnabled: true,
			csiMigrationResult:            true,
			csiMigrationCompleteResult:    true,
		},
	}
	csiTranslator := csitrans.New()
	for _, test := range testCases {
		pm := NewPluginManager(csiTranslator, utilfeature.DefaultFeatureGate)
		t.Run(fmt.Sprintf("Testing %v", test.name), func(t *testing.T) {
			// TODO: this will be removed in 1.36
			featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, utilfeature.DefaultFeatureGate, version.MustParse("1.32"))
			if len(test.pluginFeature) > 0 {
				featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, test.pluginFeature, test.pluginFeatureEnabled)
			}
			featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, test.inTreePluginUnregister, test.inTreePluginUnregisterEnabled)

			csiMigrationResult := pm.IsMigrationEnabledForPlugin(test.pluginName)
			if csiMigrationResult != test.csiMigrationResult {
				t.Errorf("Expected migratability of plugin %v: %v does not match obtained migratability: %v", test.pluginName, test.csiMigrationResult, csiMigrationResult)
			}
			csiMigrationCompleteResult := pm.IsMigrationCompleteForPlugin(test.pluginName)
			if csiMigrationCompleteResult != test.csiMigrationCompleteResult {
				t.Errorf("Expected migration complete status of plugin: %v: %v does not match obtained migratability: %v", test.pluginName, test.csiMigrationCompleteResult, csiMigrationResult)
			}
		})
	}
}