package v1alpha3

import (
	"github.com/google/go-cmp/cmp"
	fakesnapshot "github.com/kubernetes-csi/external-snapshotter/v2/pkg/client/clientset/versioned/fake"
	fakeistio "istio.io/client-go/pkg/clientset/versioned/fake"
	appsv1 "k8s.io/api/apps/v1"
	corev1 "k8s.io/api/core/v1"
	fakeapiextensions "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset/fake"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	fakek8s "k8s.io/client-go/kubernetes/fake"
	"kubesphere.io/kubesphere/pkg/api"
	"kubesphere.io/kubesphere/pkg/apiserver/query"
	fakeks "kubesphere.io/kubesphere/pkg/client/clientset/versioned/fake"
	"kubesphere.io/kubesphere/pkg/informers"
	"kubesphere.io/kubesphere/pkg/models/resources/v1alpha3/resource"
	fakeapp "sigs.k8s.io/application/pkg/client/clientset/versioned/fake"
	"testing"
)

func TestResourceV1alpha2Fallback(t *testing.T) {
	tests := []struct {
		description   string
		namespace     string
		resource      string
		query         *query.Query
		expectedError error
		expected      *api.ListResult
	}{
		{
			description: "list namespaces",
			namespace:   "default",
			resource:    "namespaces",
			query: &query.Query{
				Pagination: &query.Pagination{
					Limit:  10,
					Offset: 0,
				},
				SortBy:    "name",
				Ascending: false,
				Filters:   nil,
			},
			expectedError: nil,
			expected: &api.ListResult{
				Items:      []interface{}{kubesphereNamespace, defaultNamespace},
				TotalItems: 2,
			},
		},
		{
			description: "list secrets fallback",
			namespace:   "default",
			resource:    "secrets",
			query: &query.Query{
				Pagination: &query.Pagination{
					Limit:  10,
					Offset: 0,
				},
				SortBy:    "name",
				Ascending: false,
				Filters:   nil,
			},
			expectedError: nil,
			expected: &api.ListResult{
				Items:      []interface{}{secretFoo2, secretFoo1},
				TotalItems: 2,
			},
		},
	}

	factory, err := prepare()
	if err != nil {
		t.Fatal(err)
	}

	handler := New(factory)

	for _, test := range tests {
		got, err := listResources(test.namespace, test.resource, test.query, handler)

		if err != test.expectedError {
			t.Fatalf("expected error: %s, got: %s", test.expectedError, err)
		}
		if diff := cmp.Diff(got, test.expected); diff != "" {
			t.Errorf("%T differ (-got, +want): %s", test.expected, diff)
		}
	}
}

func listResources(namespace, resourceType string, query *query.Query, h *Handler) (*api.ListResult, error) {

	result, err := h.resourceGetterV1alpha3.List(resourceType, namespace, query)

	if err == nil {
		return result, nil
	}

	if err != resource.ErrResourceNotSupported {
		return nil, err
	}

	// fallback to v1alpha2
	return h.fallback(resourceType, namespace, query)
}

var (
	defaultNamespace = &corev1.Namespace{
		ObjectMeta: metav1.ObjectMeta{
			Name:   "default",
			Labels: map[string]string{"kubesphere.io/workspace": "system-workspace"},
		},
	}
	kubesphereNamespace = &corev1.Namespace{
		ObjectMeta: metav1.ObjectMeta{
			Name:   "kubesphere-system",
			Labels: map[string]string{"kubesphere.io/workspace": "system-workspace"},
		},
	}
	secretFoo1 = &corev1.Secret{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "foo1",
			Namespace: "default",
		},
	}
	secretFoo2 = &corev1.Secret{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "foo2",
			Namespace: "default",
		},
	}

	replicas = int32(1)

	nginxDeployment = &appsv1.Deployment{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "nginx",
			Namespace: "default",
		},
		Spec: appsv1.DeploymentSpec{
			Replicas: &replicas,
		},
		Status: appsv1.DeploymentStatus{
			ReadyReplicas: 1,
		},
	}
	redisDeployment = &appsv1.Deployment{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "redis",
			Namespace: "default",
			Labels:    map[string]string{"kubesphere.io/creator": "admin"},
		},
		Spec: appsv1.DeploymentSpec{
			Replicas: &replicas,
		},
		Status: appsv1.DeploymentStatus{
			ReadyReplicas: 0,
		},
	}
	deployments = []interface{}{redisDeployment, nginxDeployment}
	namespaces  = []interface{}{defaultNamespace, kubesphereNamespace}
	secrets     = []interface{}{secretFoo1, secretFoo2}
)

func prepare() (informers.InformerFactory, error) {

	ksClient := fakeks.NewSimpleClientset()
	k8sClient := fakek8s.NewSimpleClientset()
	istioClient := fakeistio.NewSimpleClientset()
	appClient := fakeapp.NewSimpleClientset()
	snapshotClient := fakesnapshot.NewSimpleClientset()
	apiextensionsClient := fakeapiextensions.NewSimpleClientset()

	fakeInformerFactory := informers.NewInformerFactories(k8sClient, ksClient, istioClient, appClient, snapshotClient, apiextensionsClient)

	k8sInformerFactory := fakeInformerFactory.KubernetesSharedInformerFactory()

	for _, namespace := range namespaces {
		err := k8sInformerFactory.Core().V1().Namespaces().Informer().GetIndexer().Add(namespace)
		if err != nil {
			return nil, err
		}
	}
	for _, deployment := range deployments {
		err := k8sInformerFactory.Apps().V1().Deployments().Informer().GetIndexer().Add(deployment)
		if err != nil {
			return nil, err
		}
	}
	for _, secret := range secrets {
		err := k8sInformerFactory.Core().V1().Secrets().Informer().GetIndexer().Add(secret)
		if err != nil {
			return nil, err
		}
	}

	return fakeInformerFactory, nil
}