/*
Copyright 2017 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 v1_test

import (
	"reflect"
	"testing"

	"github.com/google/go-cmp/cmp"
	storagev1 "k8s.io/api/storage/v1"
	"k8s.io/apimachinery/pkg/runtime"
	utilfeature "k8s.io/apiserver/pkg/util/feature"
	featuregatetesting "k8s.io/component-base/featuregate/testing"
	"k8s.io/kubernetes/pkg/api/legacyscheme"
	_ "k8s.io/kubernetes/pkg/apis/storage/install"
	"k8s.io/kubernetes/pkg/features"
)

func roundTrip(t *testing.T, obj runtime.Object) runtime.Object {
	codec := legacyscheme.Codecs.LegacyCodec(storagev1.SchemeGroupVersion)
	data, err := runtime.Encode(codec, obj)
	if err != nil {
		t.Errorf("%v\n %#v", err, obj)
		return nil
	}
	obj2, err := runtime.Decode(codec, data)
	if err != nil {
		t.Errorf("%v\nData: %s\nSource: %#v", err, string(data), obj)
		return nil
	}
	obj3 := reflect.New(reflect.TypeOf(obj).Elem()).Interface().(runtime.Object)
	err = legacyscheme.Scheme.Convert(obj2, obj3, nil)
	if err != nil {
		t.Errorf("%v\nSource: %#v", err, obj2)
		return nil
	}
	return obj3
}

func TestSetDefaultStorageCapacityEnabled(t *testing.T) {
	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.CSIStorageCapacity, true)()
	driver := &storagev1.CSIDriver{}

	// field should be defaulted
	defaultStorageCapacity := false
	output := roundTrip(t, runtime.Object(driver)).(*storagev1.CSIDriver)
	outStorageCapacity := output.Spec.StorageCapacity
	if outStorageCapacity == nil {
		t.Errorf("Expected StorageCapacity to be defaulted to: %+v, got: nil", defaultStorageCapacity)
	} else if *outStorageCapacity != defaultStorageCapacity {
		t.Errorf("Expected StorageCapacity to be defaulted to: %+v, got: %+v", defaultStorageCapacity, outStorageCapacity)
	}
}

func TestSetDefaultStorageCapacityDisabled(t *testing.T) {
	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.CSIStorageCapacity, false)()
	driver := &storagev1.CSIDriver{}

	// field should not be defaulted
	output := roundTrip(t, runtime.Object(driver)).(*storagev1.CSIDriver)
	outStorageCapacity := output.Spec.StorageCapacity
	if outStorageCapacity != nil {
		t.Errorf("Expected StorageCapacity to remain nil, got: %+v", outStorageCapacity)
	}
}

func TestSetDefaultVolumeBindingMode(t *testing.T) {
	class := &storagev1.StorageClass{}

	// field should be defaulted
	defaultMode := storagev1.VolumeBindingImmediate
	output := roundTrip(t, runtime.Object(class)).(*storagev1.StorageClass)
	outMode := output.VolumeBindingMode
	if outMode == nil {
		t.Errorf("Expected VolumeBindingMode to be defaulted to: %+v, got: nil", defaultMode)
	} else if *outMode != defaultMode {
		t.Errorf("Expected VolumeBindingMode to be defaulted to: %+v, got: %+v", defaultMode, outMode)
	}
}

func TestSetDefaultCSIDriver(t *testing.T) {
	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.CSIInlineVolume, true)()

	enabled := true
	disabled := false
	tests := []struct {
		desc     string
		field    string
		wantSpec *storagev1.CSIDriverSpec
	}{
		{
			desc:     "AttachRequired default to true",
			field:    "AttachRequired",
			wantSpec: &storagev1.CSIDriverSpec{AttachRequired: &enabled},
		},
		{
			desc:     "PodInfoOnMount default to false",
			field:    "PodInfoOnMount",
			wantSpec: &storagev1.CSIDriverSpec{PodInfoOnMount: &disabled},
		},
		{
			desc:     "VolumeLifecycleModes default to VolumeLifecyclePersistent",
			field:    "VolumeLifecycleModes",
			wantSpec: &storagev1.CSIDriverSpec{VolumeLifecycleModes: []storagev1.VolumeLifecycleMode{storagev1.VolumeLifecyclePersistent}},
		},
		{
			desc:     "RequiresRepublish default to false",
			field:    "RequiresRepublish",
			wantSpec: &storagev1.CSIDriverSpec{RequiresRepublish: &disabled},
		},
	}

	for _, test := range tests {
		t.Run(test.desc, func(t *testing.T) {
			gotSpec := roundTrip(t, runtime.Object(&storagev1.CSIDriver{})).(*storagev1.CSIDriver).Spec
			got := reflect.Indirect(reflect.ValueOf(gotSpec)).FieldByName(test.field).Interface()
			want := reflect.Indirect(reflect.ValueOf(test.wantSpec)).FieldByName(test.field).Interface()
			if diff := cmp.Diff(want, got); diff != "" {
				t.Errorf("CSIDriver defaults diff (-want +got):\n%s", diff)
			}
		})
	}
}
