/*
Copyright 2016 The Kubernetes Authors.
Copyright 2020 Authors of Arktos - file modified.

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 replicaset

import (
	"reflect"
	"testing"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/validation/field"
	genericapirequest "k8s.io/apiserver/pkg/endpoints/request"
	"k8s.io/apiserver/pkg/registry/rest"
	"k8s.io/kubernetes/pkg/apis/apps"
	api "k8s.io/kubernetes/pkg/apis/core"
)

const (
	fakeImageName  = "fake-name"
	fakeImage      = "fakeimage"
	replicasetName = "test-replicaset"
	namespace      = "test-namespace"
	tenant         = "test-tenant"
)

func TestReplicaSetStrategy(t *testing.T) {
	ctx := genericapirequest.NewDefaultContext()
	if !Strategy.NamespaceScoped() {
		t.Errorf("ReplicaSet must be namespace scoped")
	}
	if !Strategy.TenantScoped() {
		t.Errorf("ReplicaSet must be tenant scoped")
	}
	if Strategy.AllowCreateOnUpdate() {
		t.Errorf("ReplicaSet should not allow create on update")
	}

	validSelector := map[string]string{"a": "b"}
	validPodTemplate := api.PodTemplate{
		Template: api.PodTemplateSpec{
			ObjectMeta: metav1.ObjectMeta{
				Labels: validSelector,
			},
			Spec: api.PodSpec{
				RestartPolicy: api.RestartPolicyAlways,
				DNSPolicy:     api.DNSClusterFirst,
				Containers:    []api.Container{{Name: "abc", Image: "image", ImagePullPolicy: "IfNotPresent", TerminationMessagePolicy: api.TerminationMessageReadFile}},
			},
		},
	}
	rs := &apps.ReplicaSet{
		ObjectMeta: metav1.ObjectMeta{Name: "abc", Namespace: metav1.NamespaceDefault, Tenant: tenant},
		Spec: apps.ReplicaSetSpec{
			Selector: &metav1.LabelSelector{MatchLabels: validSelector},
			Template: validPodTemplate.Template,
		},
		Status: apps.ReplicaSetStatus{
			Replicas:           1,
			ObservedGeneration: int64(10),
		},
	}

	Strategy.PrepareForCreate(ctx, rs)
	if rs.Status.Replicas != 0 {
		t.Error("ReplicaSet should not allow setting status.replicas on create")
	}
	if rs.Status.ObservedGeneration != int64(0) {
		t.Error("ReplicaSet should not allow setting status.observedGeneration on create")
	}
	errs := Strategy.Validate(ctx, rs)
	if len(errs) != 0 {
		t.Errorf("Unexpected error validating %v", errs)
	}

	invalidRc := &apps.ReplicaSet{
		ObjectMeta: metav1.ObjectMeta{Name: "bar", ResourceVersion: "4"},
	}
	Strategy.PrepareForUpdate(ctx, invalidRc, rs)
	errs = Strategy.ValidateUpdate(ctx, invalidRc, rs)
	if len(errs) == 0 {
		t.Errorf("Expected a validation error")
	}
	if invalidRc.ResourceVersion != "4" {
		t.Errorf("Incoming resource version on update should not be mutated")
	}
}

func TestReplicaSetStatusStrategy(t *testing.T) {
	ctx := genericapirequest.NewDefaultContext()
	if !StatusStrategy.NamespaceScoped() {
		t.Errorf("ReplicaSet must be namespace scoped")
	}
	if !StatusStrategy.TenantScoped() {
		t.Errorf("ReplicaSet must be tenant scoped")
	}
	if StatusStrategy.AllowCreateOnUpdate() {
		t.Errorf("ReplicaSet should not allow create on update")
	}
	validSelector := map[string]string{"a": "b"}
	validPodTemplate := api.PodTemplate{
		Template: api.PodTemplateSpec{
			ObjectMeta: metav1.ObjectMeta{
				Labels: validSelector,
			},
			Spec: api.PodSpec{
				RestartPolicy: api.RestartPolicyAlways,
				DNSPolicy:     api.DNSClusterFirst,
				Containers:    []api.Container{{Name: "abc", Image: "image", ImagePullPolicy: "IfNotPresent"}},
			},
		},
	}
	oldRS := &apps.ReplicaSet{
		ObjectMeta: metav1.ObjectMeta{Name: "abc", Namespace: metav1.NamespaceDefault, ResourceVersion: "10", Tenant: tenant},
		Spec: apps.ReplicaSetSpec{
			Replicas: 3,
			Selector: &metav1.LabelSelector{MatchLabels: validSelector},
			Template: validPodTemplate.Template,
		},
		Status: apps.ReplicaSetStatus{
			Replicas:           1,
			ObservedGeneration: int64(10),
		},
	}
	newRS := &apps.ReplicaSet{
		ObjectMeta: metav1.ObjectMeta{Name: "abc", Namespace: metav1.NamespaceDefault, ResourceVersion: "9", Tenant: tenant},
		Spec: apps.ReplicaSetSpec{
			Replicas: 1,
			Selector: &metav1.LabelSelector{MatchLabels: validSelector},
			Template: validPodTemplate.Template,
		},
		Status: apps.ReplicaSetStatus{
			Replicas:           3,
			ObservedGeneration: int64(11),
		},
	}
	StatusStrategy.PrepareForUpdate(ctx, newRS, oldRS)
	if newRS.Status.Replicas != 3 {
		t.Errorf("ReplicaSet status updates should allow change of replicas: %v", newRS.Status.Replicas)
	}
	if newRS.Spec.Replicas != 3 {
		t.Errorf("PrepareForUpdate should have preferred spec")
	}
	errs := StatusStrategy.ValidateUpdate(ctx, newRS, oldRS)
	if len(errs) != 0 {
		t.Errorf("Unexpected error %v", errs)
	}
}

func TestSelectorImmutability(t *testing.T) {
	tests := []struct {
		requestInfo       genericapirequest.RequestInfo
		oldSelectorLabels map[string]string
		newSelectorLabels map[string]string
		expectedErrorList field.ErrorList
	}{
		{
			genericapirequest.RequestInfo{
				APIGroup:   "apps",
				APIVersion: "v1beta2",
				Resource:   "replicasets",
			},
			map[string]string{"a": "b"},
			map[string]string{"c": "d"},
			field.ErrorList{
				&field.Error{
					Type:  field.ErrorTypeInvalid,
					Field: field.NewPath("spec").Child("selector").String(),
					BadValue: &metav1.LabelSelector{
						MatchLabels:      map[string]string{"c": "d"},
						MatchExpressions: []metav1.LabelSelectorRequirement{},
					},
					Detail: "field is immutable",
				},
			},
		},
		{
			genericapirequest.RequestInfo{
				APIGroup:   "extensions",
				APIVersion: "v1beta1",
				Resource:   "replicasets",
			},
			map[string]string{"a": "b"},
			map[string]string{"c": "d"},
			field.ErrorList{},
		},
	}

	for _, test := range tests {
		oldReplicaSet := newReplicaSetWithSelectorLabels(test.oldSelectorLabels)
		newReplicaSet := newReplicaSetWithSelectorLabels(test.newSelectorLabels)
		context := genericapirequest.NewContext()
		context = genericapirequest.WithRequestInfo(context, &test.requestInfo)
		errorList := rsStrategy{}.ValidateUpdate(context, newReplicaSet, oldReplicaSet)
		if !reflect.DeepEqual(test.expectedErrorList, errorList) {
			t.Errorf("Unexpected error list, expected: %v, actual: %v", test.expectedErrorList, errorList)
		}
	}
}

func newReplicaSetWithSelectorLabels(selectorLabels map[string]string) *apps.ReplicaSet {
	return &apps.ReplicaSet{
		ObjectMeta: metav1.ObjectMeta{
			Name:            replicasetName,
			Namespace:       namespace,
			Tenant:          tenant,
			ResourceVersion: "1",
		},
		Spec: apps.ReplicaSetSpec{
			Selector: &metav1.LabelSelector{
				MatchLabels:      selectorLabels,
				MatchExpressions: []metav1.LabelSelectorRequirement{},
			},
			Template: api.PodTemplateSpec{
				ObjectMeta: metav1.ObjectMeta{
					Labels: selectorLabels,
				},
				Spec: api.PodSpec{
					RestartPolicy: api.RestartPolicyAlways,
					DNSPolicy:     api.DNSClusterFirst,
					Containers:    []api.Container{{Name: fakeImageName, Image: fakeImage, ImagePullPolicy: "IfNotPresent", TerminationMessagePolicy: api.TerminationMessageReadFile}},
				},
			},
		},
	}
}

func TestReplicasetDefaultGarbageCollectionPolicy(t *testing.T) {
	// Make sure we correctly implement the interface.
	// Otherwise a typo could silently change the default.
	var gcds rest.GarbageCollectionDeleteStrategy = Strategy
	tests := []struct {
		requestInfo      genericapirequest.RequestInfo
		expectedGCPolicy rest.GarbageCollectionPolicy
		isNilRequestInfo bool
	}{
		{
			genericapirequest.RequestInfo{
				APIGroup:   "extensions",
				APIVersion: "v1beta1",
				Resource:   "replicasets",
			},
			rest.OrphanDependents,
			false,
		},
		{
			genericapirequest.RequestInfo{
				APIGroup:   "apps",
				APIVersion: "v1beta2",
				Resource:   "replicasets",
			},
			rest.OrphanDependents,
			false,
		},
		{
			genericapirequest.RequestInfo{
				APIGroup:   "apps",
				APIVersion: "v1",
				Resource:   "replicasets",
			},
			rest.DeleteDependents,
			false,
		},
		{
			expectedGCPolicy: rest.DeleteDependents,
			isNilRequestInfo: true,
		},
	}

	for _, test := range tests {
		context := genericapirequest.NewContext()
		if !test.isNilRequestInfo {
			context = genericapirequest.WithRequestInfo(context, &test.requestInfo)
		}
		if got, want := gcds.DefaultGarbageCollectionPolicy(context), test.expectedGCPolicy; got != want {
			t.Errorf("%s/%s: DefaultGarbageCollectionPolicy() = %#v, want %#v", test.requestInfo.APIGroup,
				test.requestInfo.APIVersion, got, want)
		}
	}
}
