/*
Copyright The Helm 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 kube // import "helm.sh/helm/v3/pkg/kube"

import (
	"context"
	"testing"

	appsv1 "k8s.io/api/apps/v1"
	batchv1 "k8s.io/api/batch/v1"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/util/intstr"
	"k8s.io/client-go/kubernetes/fake"
)

const defaultNamespace = metav1.NamespaceDefault

func Test_ReadyChecker_deploymentReady(t *testing.T) {
	type args struct {
		rs  *appsv1.ReplicaSet
		dep *appsv1.Deployment
	}
	tests := []struct {
		name string
		args args
		want bool
	}{
		{
			name: "deployment is ready",
			args: args{
				rs:  newReplicaSet("foo", 1, 1),
				dep: newDeployment("foo", 1, 1, 0),
			},
			want: true,
		},
		{
			name: "deployment is not ready",
			args: args{
				rs:  newReplicaSet("foo", 0, 0),
				dep: newDeployment("foo", 1, 1, 0),
			},
			want: false,
		},
		{
			name: "deployment is ready when maxUnavailable is set",
			args: args{
				rs:  newReplicaSet("foo", 2, 1),
				dep: newDeployment("foo", 2, 1, 1),
			},
			want: true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			c := NewReadyChecker(fake.NewSimpleClientset(), nil)
			if got := c.deploymentReady(tt.args.rs, tt.args.dep); got != tt.want {
				t.Errorf("deploymentReady() = %v, want %v", got, tt.want)
			}
		})
	}
}

func Test_ReadyChecker_daemonSetReady(t *testing.T) {
	type args struct {
		ds *appsv1.DaemonSet
	}
	tests := []struct {
		name string
		args args
		want bool
	}{
		{
			name: "daemonset is ready",
			args: args{
				ds: newDaemonSet("foo", 0, 1, 1, 1),
			},
			want: true,
		},
		{
			name: "daemonset is not ready",
			args: args{
				ds: newDaemonSet("foo", 0, 0, 1, 1),
			},
			want: false,
		},
		{
			name: "daemonset pods have not been scheduled successfully",
			args: args{
				ds: newDaemonSet("foo", 0, 0, 1, 0),
			},
			want: false,
		},
		{
			name: "daemonset is ready when maxUnavailable is set",
			args: args{
				ds: newDaemonSet("foo", 1, 1, 2, 2),
			},
			want: true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			c := NewReadyChecker(fake.NewSimpleClientset(), nil)
			if got := c.daemonSetReady(tt.args.ds); got != tt.want {
				t.Errorf("daemonSetReady() = %v, want %v", got, tt.want)
			}
		})
	}
}

func Test_ReadyChecker_statefulSetReady(t *testing.T) {
	type args struct {
		sts *appsv1.StatefulSet
	}
	tests := []struct {
		name string
		args args
		want bool
	}{
		{
			name: "statefulset is ready",
			args: args{
				sts: newStatefulSet("foo", 1, 0, 1, 1),
			},
			want: true,
		},
		{
			name: "statefulset is not ready",
			args: args{
				sts: newStatefulSet("foo", 1, 0, 0, 1),
			},
			want: false,
		},
		{
			name: "statefulset is ready when partition is specified",
			args: args{
				sts: newStatefulSet("foo", 2, 1, 2, 1),
			},
			want: true,
		},
		{
			name: "statefulset is not ready when partition is set",
			args: args{
				sts: newStatefulSet("foo", 2, 1, 1, 0),
			},
			want: false,
		},
		{
			name: "statefulset is ready when partition is set and no change in template",
			args: args{
				sts: newStatefulSet("foo", 2, 1, 2, 2),
			},
			want: true,
		},
		{
			name: "statefulset is ready when partition is greater than replicas",
			args: args{
				sts: newStatefulSet("foo", 1, 2, 1, 1),
			},
			want: true,
		},
		{
			name: "statefulset is not ready when status of latest generation has not yet been observed",
			args: args{
				sts: newStatefulSetWithNewGeneration("foo", 1, 0, 1, 1),
			},
			want: false,
		},
		{
			name: "statefulset is not ready when current revision for current replicas does not match update revision for updated replicas",
			args: args{
				sts: newStatefulSetWithUpdateRevision("foo", 1, 0, 1, 1, "foo-bbbbbbb"),
			},
			want: false,
		},
		{
			name: "statefulset is ready when current revision for current replicas does not match update revision for updated replicas when using partition !=0",
			args: args{
				sts: newStatefulSetWithUpdateRevision("foo", 3, 2, 3, 3, "foo-bbbbbbb"),
			},
			want: true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			c := NewReadyChecker(fake.NewSimpleClientset(), nil)
			if got := c.statefulSetReady(tt.args.sts); got != tt.want {
				t.Errorf("statefulSetReady() = %v, want %v", got, tt.want)
			}
		})
	}
}

func Test_ReadyChecker_podsReadyForObject(t *testing.T) {
	type args struct {
		namespace string
		obj       runtime.Object
	}
	tests := []struct {
		name      string
		args      args
		existPods []corev1.Pod
		want      bool
		wantErr   bool
	}{
		{
			name: "pods ready for a replicaset",
			args: args{
				namespace: defaultNamespace,
				obj:       newReplicaSet("foo", 1, 1),
			},
			existPods: []corev1.Pod{
				*newPodWithCondition("foo", corev1.ConditionTrue),
			},
			want:    true,
			wantErr: false,
		},
		{
			name: "pods not ready for a replicaset",
			args: args{
				namespace: defaultNamespace,
				obj:       newReplicaSet("foo", 1, 1),
			},
			existPods: []corev1.Pod{
				*newPodWithCondition("foo", corev1.ConditionFalse),
			},
			want:    false,
			wantErr: false,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			c := NewReadyChecker(fake.NewSimpleClientset(), nil)
			for _, pod := range tt.existPods {
				if _, err := c.client.CoreV1().Pods(defaultNamespace).Create(context.TODO(), &pod, metav1.CreateOptions{}); err != nil {
					t.Errorf("Failed to create Pod error: %v", err)
					return
				}
			}
			got, err := c.podsReadyForObject(context.TODO(), tt.args.namespace, tt.args.obj)
			if (err != nil) != tt.wantErr {
				t.Errorf("podsReadyForObject() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if got != tt.want {
				t.Errorf("podsReadyForObject() got = %v, want %v", got, tt.want)
			}
		})
	}
}

func Test_ReadyChecker_jobReady(t *testing.T) {
	type args struct {
		job *batchv1.Job
	}
	tests := []struct {
		name    string
		args    args
		want    bool
		wantErr bool
	}{
		{
			name:    "job is completed",
			args:    args{job: newJob("foo", 1, intToInt32(1), 1, 0)},
			want:    true,
			wantErr: false,
		},
		{
			name:    "job is incomplete",
			args:    args{job: newJob("foo", 1, intToInt32(1), 0, 0)},
			want:    false,
			wantErr: false,
		},
		{
			name:    "job is failed but within BackoffLimit",
			args:    args{job: newJob("foo", 1, intToInt32(1), 0, 1)},
			want:    false,
			wantErr: false,
		},
		{
			name:    "job is completed with retry",
			args:    args{job: newJob("foo", 1, intToInt32(1), 1, 1)},
			want:    true,
			wantErr: false,
		},
		{
			name:    "job is failed and beyond BackoffLimit",
			args:    args{job: newJob("foo", 1, intToInt32(1), 0, 2)},
			want:    false,
			wantErr: true,
		},
		{
			name:    "job is completed single run",
			args:    args{job: newJob("foo", 0, intToInt32(1), 1, 0)},
			want:    true,
			wantErr: false,
		},
		{
			name:    "job is failed single run",
			args:    args{job: newJob("foo", 0, intToInt32(1), 0, 1)},
			want:    false,
			wantErr: true,
		},
		{
			name: "job with null completions",
			args: args{job: newJob("foo", 0, nil, 1, 0)},
			want: true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			c := NewReadyChecker(fake.NewSimpleClientset(), nil)
			got, err := c.jobReady(tt.args.job)
			if (err != nil) != tt.wantErr {
				t.Errorf("jobReady() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if got != tt.want {
				t.Errorf("jobReady() = %v, want %v", got, tt.want)
			}
		})
	}
}

func Test_ReadyChecker_volumeReady(t *testing.T) {
	type args struct {
		v *corev1.PersistentVolumeClaim
	}
	tests := []struct {
		name string
		args args
		want bool
	}{
		{
			name: "pvc is bound",
			args: args{
				v: newPersistentVolumeClaim("foo", corev1.ClaimBound),
			},
			want: true,
		},
		{
			name: "pvc is not ready",
			args: args{
				v: newPersistentVolumeClaim("foo", corev1.ClaimPending),
			},
			want: false,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			c := NewReadyChecker(fake.NewSimpleClientset(), nil)
			if got := c.volumeReady(tt.args.v); got != tt.want {
				t.Errorf("volumeReady() = %v, want %v", got, tt.want)
			}
		})
	}
}

func newDaemonSet(name string, maxUnavailable, numberReady, desiredNumberScheduled, updatedNumberScheduled int) *appsv1.DaemonSet {
	return &appsv1.DaemonSet{
		ObjectMeta: metav1.ObjectMeta{
			Name:      name,
			Namespace: defaultNamespace,
		},
		Spec: appsv1.DaemonSetSpec{
			UpdateStrategy: appsv1.DaemonSetUpdateStrategy{
				Type: appsv1.RollingUpdateDaemonSetStrategyType,
				RollingUpdate: &appsv1.RollingUpdateDaemonSet{
					MaxUnavailable: func() *intstr.IntOrString { i := intstr.FromInt(maxUnavailable); return &i }(),
				},
			},
			Selector: &metav1.LabelSelector{MatchLabels: map[string]string{"name": name}},
			Template: corev1.PodTemplateSpec{
				ObjectMeta: metav1.ObjectMeta{
					Name:   name,
					Labels: map[string]string{"name": name},
				},
				Spec: corev1.PodSpec{
					Containers: []corev1.Container{
						{
							Image: "nginx",
						},
					},
				},
			},
		},
		Status: appsv1.DaemonSetStatus{
			DesiredNumberScheduled: int32(desiredNumberScheduled),
			NumberReady:            int32(numberReady),
			UpdatedNumberScheduled: int32(updatedNumberScheduled),
		},
	}
}

func newStatefulSet(name string, replicas, partition, readyReplicas, updatedReplicas int) *appsv1.StatefulSet {
	return &appsv1.StatefulSet{
		ObjectMeta: metav1.ObjectMeta{
			Name:       name,
			Namespace:  defaultNamespace,
			Generation: int64(1),
		},
		Spec: appsv1.StatefulSetSpec{
			UpdateStrategy: appsv1.StatefulSetUpdateStrategy{
				Type: appsv1.RollingUpdateStatefulSetStrategyType,
				RollingUpdate: &appsv1.RollingUpdateStatefulSetStrategy{
					Partition: intToInt32(partition),
				},
			},
			Replicas: intToInt32(replicas),
			Selector: &metav1.LabelSelector{MatchLabels: map[string]string{"name": name}},
			Template: corev1.PodTemplateSpec{
				ObjectMeta: metav1.ObjectMeta{
					Name:   name,
					Labels: map[string]string{"name": name},
				},
				Spec: corev1.PodSpec{
					Containers: []corev1.Container{
						{
							Image: "nginx",
						},
					},
				},
			},
		},
		Status: appsv1.StatefulSetStatus{
			ObservedGeneration: int64(1),
			CurrentRevision:    name + "-aaaaaaa",
			UpdateRevision:     name + "-aaaaaaa",
			UpdatedReplicas:    int32(updatedReplicas),
			ReadyReplicas:      int32(readyReplicas),
		},
	}
}

func newStatefulSetWithNewGeneration(name string, replicas, partition, readyReplicas, updatedReplicas int) *appsv1.StatefulSet {
	ss := newStatefulSet(name, replicas, partition, readyReplicas, updatedReplicas)
	ss.Generation++
	return ss
}

func newStatefulSetWithUpdateRevision(name string, replicas, partition, readyReplicas, updatedReplicas int, updateRevision string) *appsv1.StatefulSet {
	ss := newStatefulSet(name, replicas, partition, readyReplicas, updatedReplicas)
	ss.Status.UpdateRevision = updateRevision
	return ss
}

func newDeployment(name string, replicas, maxSurge, maxUnavailable int) *appsv1.Deployment {
	return &appsv1.Deployment{
		ObjectMeta: metav1.ObjectMeta{
			Name:      name,
			Namespace: defaultNamespace,
		},
		Spec: appsv1.DeploymentSpec{
			Strategy: appsv1.DeploymentStrategy{
				Type: appsv1.RollingUpdateDeploymentStrategyType,
				RollingUpdate: &appsv1.RollingUpdateDeployment{
					MaxUnavailable: func() *intstr.IntOrString { i := intstr.FromInt(maxUnavailable); return &i }(),
					MaxSurge:       func() *intstr.IntOrString { i := intstr.FromInt(maxSurge); return &i }(),
				},
			},
			Replicas: intToInt32(replicas),
			Selector: &metav1.LabelSelector{MatchLabels: map[string]string{"name": name}},
			Template: corev1.PodTemplateSpec{
				ObjectMeta: metav1.ObjectMeta{
					Name:   name,
					Labels: map[string]string{"name": name},
				},
				Spec: corev1.PodSpec{
					Containers: []corev1.Container{
						{
							Image: "nginx",
						},
					},
				},
			},
		},
	}
}

func newReplicaSet(name string, replicas int, readyReplicas int) *appsv1.ReplicaSet {
	d := newDeployment(name, replicas, 0, 0)
	return &appsv1.ReplicaSet{
		ObjectMeta: metav1.ObjectMeta{
			Name:            name,
			Namespace:       defaultNamespace,
			Labels:          d.Spec.Selector.MatchLabels,
			OwnerReferences: []metav1.OwnerReference{*metav1.NewControllerRef(d, d.GroupVersionKind())},
		},
		Spec: appsv1.ReplicaSetSpec{
			Selector: d.Spec.Selector,
			Replicas: intToInt32(replicas),
			Template: d.Spec.Template,
		},
		Status: appsv1.ReplicaSetStatus{
			ReadyReplicas: int32(readyReplicas),
		},
	}
}

func newPodWithCondition(name string, podReadyCondition corev1.ConditionStatus) *corev1.Pod {
	return &corev1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Name:      name,
			Namespace: defaultNamespace,
			Labels:    map[string]string{"name": name},
		},
		Spec: corev1.PodSpec{
			Containers: []corev1.Container{
				{
					Image: "nginx",
				},
			},
		},
		Status: corev1.PodStatus{
			Conditions: []corev1.PodCondition{
				{
					Type:   corev1.PodReady,
					Status: podReadyCondition,
				},
			},
		},
	}
}

func newPersistentVolumeClaim(name string, phase corev1.PersistentVolumeClaimPhase) *corev1.PersistentVolumeClaim {
	return &corev1.PersistentVolumeClaim{
		ObjectMeta: metav1.ObjectMeta{
			Name:      name,
			Namespace: defaultNamespace,
		},
		Status: corev1.PersistentVolumeClaimStatus{
			Phase: phase,
		},
	}
}

func newJob(name string, backoffLimit int, completions *int32, succeeded int, failed int) *batchv1.Job {
	return &batchv1.Job{
		ObjectMeta: metav1.ObjectMeta{
			Name:      name,
			Namespace: defaultNamespace,
		},
		Spec: batchv1.JobSpec{
			BackoffLimit: intToInt32(backoffLimit),
			Completions:  completions,
			Template: corev1.PodTemplateSpec{
				ObjectMeta: metav1.ObjectMeta{
					Name:   name,
					Labels: map[string]string{"name": name},
				},
				Spec: corev1.PodSpec{
					Containers: []corev1.Container{
						{
							Image: "nginx",
						},
					},
				},
			},
		},
		Status: batchv1.JobStatus{
			Succeeded: int32(succeeded),
			Failed:    int32(failed),
		},
	}
}

func intToInt32(i int) *int32 {
	i32 := int32(i)
	return &i32
}