/*
Copyright 2020 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 helper

import (
	"fmt"
	"testing"
	"time"

	"github.com/google/go-cmp/cmp"
	v1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/client-go/informers"
	"k8s.io/client-go/kubernetes/fake"
	st "k8s.io/kubernetes/pkg/scheduler/testing"
)

func TestGetPodServices(t *testing.T) {
	fakeInformerFactory := informers.NewSharedInformerFactory(&fake.Clientset{}, 0*time.Second)
	var services []*v1.Service
	for i := 0; i < 3; i++ {
		service := &v1.Service{
			ObjectMeta: metav1.ObjectMeta{
				Name:      fmt.Sprintf("service-%d", i),
				Namespace: "test",
			},
			Spec: v1.ServiceSpec{
				Selector: map[string]string{
					"app": fmt.Sprintf("test-%d", i),
				},
			},
		}
		services = append(services, service)
		fakeInformerFactory.Core().V1().Services().Informer().GetStore().Add(service)
	}
	var pods []*v1.Pod
	for i := 0; i < 5; i++ {
		pod := st.MakePod().Name(fmt.Sprintf("test-pod-%d", i)).
			Namespace("test").
			Label("app", fmt.Sprintf("test-%d", i)).
			Label("label", fmt.Sprintf("label-%d", i)).
			Obj()
		pods = append(pods, pod)
	}

	tests := []struct {
		name   string
		pod    *v1.Pod
		expect []*v1.Service
	}{
		{
			name:   "GetPodServices for pod-0",
			pod:    pods[0],
			expect: []*v1.Service{services[0]},
		},
		{
			name:   "GetPodServices for pod-1",
			pod:    pods[1],
			expect: []*v1.Service{services[1]},
		},
		{
			name:   "GetPodServices for pod-2",
			pod:    pods[2],
			expect: []*v1.Service{services[2]},
		},
		{
			name:   "GetPodServices for pod-3",
			pod:    pods[3],
			expect: nil,
		},
		{
			name:   "GetPodServices for pod-4",
			pod:    pods[4],
			expect: nil,
		},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			get, err := GetPodServices(fakeInformerFactory.Core().V1().Services().Lister(), test.pod)
			if err != nil {
				t.Errorf("Error from GetPodServices: %v", err)
			} else if diff := cmp.Diff(test.expect, get); diff != "" {
				t.Errorf("Unexpected services (-want, +got):\n%s", diff)
			}
		})
	}
}