// Copyright 2016 The Prometheus 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 kubernetes

import (
	"testing"

	"github.com/prometheus/common/model"
	"github.com/prometheus/prometheus/discovery/targetgroup"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/types"
	"k8s.io/client-go/pkg/api/v1"
)

func makeEndpoints() *v1.Endpoints {
	return &v1.Endpoints{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "testendpoints",
			Namespace: "default",
		},
		Subsets: []v1.EndpointSubset{
			{
				Addresses: []v1.EndpointAddress{
					{
						IP: "1.2.3.4",
					},
				},
				Ports: []v1.EndpointPort{
					{
						Name:     "testport",
						Port:     9000,
						Protocol: v1.ProtocolTCP,
					},
				},
			},
			{
				Addresses: []v1.EndpointAddress{
					{
						IP: "2.3.4.5",
					},
				},
				NotReadyAddresses: []v1.EndpointAddress{
					{
						IP: "2.3.4.5",
					},
				},
				Ports: []v1.EndpointPort{
					{
						Name:     "testport",
						Port:     9001,
						Protocol: v1.ProtocolTCP,
					},
				},
			},
		},
	}
}

func TestEndpointsDiscoveryBeforeRun(t *testing.T) {
	n, c, w := makeDiscovery(RoleEndpoint, NamespaceDiscovery{})

	k8sDiscoveryTest{
		discovery: n,
		beforeRun: func() {
			obj := makeEndpoints()
			c.CoreV1().Endpoints(obj.Namespace).Create(obj)
			w.Endpoints().Add(obj)
		},
		expectedMaxItems: 1,
		expectedRes: map[string]*targetgroup.Group{
			"endpoints/default/testendpoints": {
				Targets: []model.LabelSet{
					{
						"__address__":                              "1.2.3.4:9000",
						"__meta_kubernetes_endpoint_port_name":     "testport",
						"__meta_kubernetes_endpoint_port_protocol": "TCP",
						"__meta_kubernetes_endpoint_ready":         "true",
					},
					{
						"__address__":                              "2.3.4.5:9001",
						"__meta_kubernetes_endpoint_port_name":     "testport",
						"__meta_kubernetes_endpoint_port_protocol": "TCP",
						"__meta_kubernetes_endpoint_ready":         "true",
					},
					{
						"__address__":                              "2.3.4.5:9001",
						"__meta_kubernetes_endpoint_port_name":     "testport",
						"__meta_kubernetes_endpoint_port_protocol": "TCP",
						"__meta_kubernetes_endpoint_ready":         "false",
					},
				},
				Labels: model.LabelSet{
					"__meta_kubernetes_namespace":      "default",
					"__meta_kubernetes_endpoints_name": "testendpoints",
				},
				Source: "endpoints/default/testendpoints",
			},
		},
	}.Run(t)
}

func TestEndpointsDiscoveryAdd(t *testing.T) {
	obj := &v1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "testpod",
			Namespace: "default",
			UID:       types.UID("deadbeef"),
		},
		Spec: v1.PodSpec{
			NodeName: "testnode",
			Containers: []v1.Container{
				{
					Name: "c1",
					Ports: []v1.ContainerPort{
						{
							Name:          "mainport",
							ContainerPort: 9000,
							Protocol:      v1.ProtocolTCP,
						},
					},
				},
				{
					Name: "c2",
					Ports: []v1.ContainerPort{
						{
							Name:          "sideport",
							ContainerPort: 9001,
							Protocol:      v1.ProtocolTCP,
						},
					},
				},
			},
		},
		Status: v1.PodStatus{
			HostIP: "2.3.4.5",
			PodIP:  "1.2.3.4",
		},
	}
	n, c, w := makeDiscovery(RoleEndpoint, NamespaceDiscovery{}, obj)

	k8sDiscoveryTest{
		discovery: n,
		afterStart: func() {
			obj := &v1.Endpoints{
				ObjectMeta: metav1.ObjectMeta{
					Name:      "testendpoints",
					Namespace: "default",
				},
				Subsets: []v1.EndpointSubset{
					{
						Addresses: []v1.EndpointAddress{
							{
								IP: "4.3.2.1",
								TargetRef: &v1.ObjectReference{
									Kind:      "Pod",
									Name:      "testpod",
									Namespace: "default",
								},
							},
						},
						Ports: []v1.EndpointPort{
							{
								Name:     "testport",
								Port:     9000,
								Protocol: v1.ProtocolTCP,
							},
						},
					},
				},
			}
			c.CoreV1().Endpoints(obj.Namespace).Create(obj)
			w.Endpoints().Add(obj)
		},
		expectedMaxItems: 1,
		expectedRes: map[string]*targetgroup.Group{
			"endpoints/default/testendpoints": {
				Targets: []model.LabelSet{
					{
						"__address__":                                   "4.3.2.1:9000",
						"__meta_kubernetes_endpoint_port_name":          "testport",
						"__meta_kubernetes_endpoint_port_protocol":      "TCP",
						"__meta_kubernetes_endpoint_ready":              "true",
						"__meta_kubernetes_pod_name":                    "testpod",
						"__meta_kubernetes_pod_ip":                      "1.2.3.4",
						"__meta_kubernetes_pod_ready":                   "unknown",
						"__meta_kubernetes_pod_node_name":               "testnode",
						"__meta_kubernetes_pod_host_ip":                 "2.3.4.5",
						"__meta_kubernetes_pod_container_name":          "c1",
						"__meta_kubernetes_pod_container_port_name":     "mainport",
						"__meta_kubernetes_pod_container_port_number":   "9000",
						"__meta_kubernetes_pod_container_port_protocol": "TCP",
						"__meta_kubernetes_pod_uid":                     "deadbeef",
					},
					{
						"__address__":                                   "1.2.3.4:9001",
						"__meta_kubernetes_pod_name":                    "testpod",
						"__meta_kubernetes_pod_ip":                      "1.2.3.4",
						"__meta_kubernetes_pod_ready":                   "unknown",
						"__meta_kubernetes_pod_node_name":               "testnode",
						"__meta_kubernetes_pod_host_ip":                 "2.3.4.5",
						"__meta_kubernetes_pod_container_name":          "c2",
						"__meta_kubernetes_pod_container_port_name":     "sideport",
						"__meta_kubernetes_pod_container_port_number":   "9001",
						"__meta_kubernetes_pod_container_port_protocol": "TCP",
						"__meta_kubernetes_pod_uid":                     "deadbeef",
					},
				},
				Labels: model.LabelSet{
					"__meta_kubernetes_endpoints_name": "testendpoints",
					"__meta_kubernetes_namespace":      "default",
				},
				Source: "endpoints/default/testendpoints",
			},
		},
	}.Run(t)
}

func TestEndpointsDiscoveryDelete(t *testing.T) {
	n, c, w := makeDiscovery(RoleEndpoint, NamespaceDiscovery{}, makeEndpoints())

	k8sDiscoveryTest{
		discovery: n,
		afterStart: func() {
			obj := makeEndpoints()
			c.CoreV1().Endpoints(obj.Namespace).Delete(obj.Name, &metav1.DeleteOptions{})
			w.Endpoints().Delete(obj)
		},
		expectedMaxItems: 2,
		expectedRes: map[string]*targetgroup.Group{
			"endpoints/default/testendpoints": {
				Source: "endpoints/default/testendpoints",
			},
		},
	}.Run(t)
}

func TestEndpointsDiscoveryUpdate(t *testing.T) {
	n, c, w := makeDiscovery(RoleEndpoint, NamespaceDiscovery{}, makeEndpoints())

	k8sDiscoveryTest{
		discovery: n,
		afterStart: func() {
			obj := &v1.Endpoints{
				ObjectMeta: metav1.ObjectMeta{
					Name:      "testendpoints",
					Namespace: "default",
				},
				Subsets: []v1.EndpointSubset{
					{
						Addresses: []v1.EndpointAddress{
							{
								IP: "1.2.3.4",
							},
						},
						Ports: []v1.EndpointPort{
							{
								Name:     "testport",
								Port:     9000,
								Protocol: v1.ProtocolTCP,
							},
						},
					},
					{
						Addresses: []v1.EndpointAddress{
							{
								IP: "2.3.4.5",
							},
						},
						Ports: []v1.EndpointPort{
							{
								Name:     "testport",
								Port:     9001,
								Protocol: v1.ProtocolTCP,
							},
						},
					},
				},
			}
			c.CoreV1().Endpoints(obj.Namespace).Update(obj)
			w.Endpoints().Modify(obj)
		},
		expectedMaxItems: 2,
		expectedRes: map[string]*targetgroup.Group{
			"endpoints/default/testendpoints": {
				Targets: []model.LabelSet{
					{
						"__address__":                              "1.2.3.4:9000",
						"__meta_kubernetes_endpoint_port_name":     "testport",
						"__meta_kubernetes_endpoint_port_protocol": "TCP",
						"__meta_kubernetes_endpoint_ready":         "true",
					},
					{
						"__address__":                              "2.3.4.5:9001",
						"__meta_kubernetes_endpoint_port_name":     "testport",
						"__meta_kubernetes_endpoint_port_protocol": "TCP",
						"__meta_kubernetes_endpoint_ready":         "true",
					},
				},
				Labels: model.LabelSet{
					"__meta_kubernetes_namespace":      "default",
					"__meta_kubernetes_endpoints_name": "testendpoints",
				},
				Source: "endpoints/default/testendpoints",
			},
		},
	}.Run(t)
}

func TestEndpointsDiscoveryEmptySubsets(t *testing.T) {
	n, c, w := makeDiscovery(RoleEndpoint, NamespaceDiscovery{}, makeEndpoints())

	k8sDiscoveryTest{
		discovery: n,
		afterStart: func() {
			obj := &v1.Endpoints{
				ObjectMeta: metav1.ObjectMeta{
					Name:      "testendpoints",
					Namespace: "default",
				},
				Subsets: []v1.EndpointSubset{},
			}
			c.CoreV1().Endpoints(obj.Namespace).Update(obj)
			w.Endpoints().Modify(obj)
		},
		expectedMaxItems: 2,
		expectedRes: map[string]*targetgroup.Group{
			"endpoints/default/testendpoints": {
				Labels: model.LabelSet{
					"__meta_kubernetes_namespace":      "default",
					"__meta_kubernetes_endpoints_name": "testendpoints",
				},
				Source: "endpoints/default/testendpoints",
			},
		},
	}.Run(t)
}

func TestEndpointsDiscoveryWithService(t *testing.T) {
	n, c, w := makeDiscovery(RoleEndpoint, NamespaceDiscovery{}, makeEndpoints())

	k8sDiscoveryTest{
		discovery: n,
		beforeRun: func() {
			obj := &v1.Service{
				ObjectMeta: metav1.ObjectMeta{
					Name:      "testendpoints",
					Namespace: "default",
					Labels: map[string]string{
						"app": "test",
					},
				},
			}
			c.CoreV1().Services(obj.Namespace).Create(obj)
			w.Services().Add(obj)
		},
		expectedMaxItems: 1,
		expectedRes: map[string]*targetgroup.Group{
			"endpoints/default/testendpoints": {
				Targets: []model.LabelSet{
					{
						"__address__":                              "1.2.3.4:9000",
						"__meta_kubernetes_endpoint_port_name":     "testport",
						"__meta_kubernetes_endpoint_port_protocol": "TCP",
						"__meta_kubernetes_endpoint_ready":         "true",
					},
					{
						"__address__":                              "2.3.4.5:9001",
						"__meta_kubernetes_endpoint_port_name":     "testport",
						"__meta_kubernetes_endpoint_port_protocol": "TCP",
						"__meta_kubernetes_endpoint_ready":         "true",
					},
					{
						"__address__":                              "2.3.4.5:9001",
						"__meta_kubernetes_endpoint_port_name":     "testport",
						"__meta_kubernetes_endpoint_port_protocol": "TCP",
						"__meta_kubernetes_endpoint_ready":         "false",
					},
				},
				Labels: model.LabelSet{
					"__meta_kubernetes_namespace":         "default",
					"__meta_kubernetes_endpoints_name":    "testendpoints",
					"__meta_kubernetes_service_label_app": "test",
					"__meta_kubernetes_service_name":      "testendpoints",
				},
				Source: "endpoints/default/testendpoints",
			},
		},
	}.Run(t)
}

func TestEndpointsDiscoveryWithServiceUpdate(t *testing.T) {
	n, c, w := makeDiscovery(RoleEndpoint, NamespaceDiscovery{}, makeEndpoints())

	k8sDiscoveryTest{
		discovery: n,
		beforeRun: func() {
			obj := &v1.Service{
				ObjectMeta: metav1.ObjectMeta{
					Name:      "testendpoints",
					Namespace: "default",
					Labels: map[string]string{
						"app": "test",
					},
				},
			}
			c.CoreV1().Services(obj.Namespace).Create(obj)
			w.Services().Add(obj)
		},
		afterStart: func() {
			obj := &v1.Service{
				ObjectMeta: metav1.ObjectMeta{
					Name:      "testendpoints",
					Namespace: "default",
					Labels: map[string]string{
						"app":       "svc",
						"component": "testing",
					},
				},
			}
			c.CoreV1().Services(obj.Namespace).Update(obj)
			w.Services().Modify(obj)
		},
		expectedMaxItems: 2,
		expectedRes: map[string]*targetgroup.Group{
			"endpoints/default/testendpoints": {
				Targets: []model.LabelSet{
					{
						"__address__":                              "1.2.3.4:9000",
						"__meta_kubernetes_endpoint_port_name":     "testport",
						"__meta_kubernetes_endpoint_port_protocol": "TCP",
						"__meta_kubernetes_endpoint_ready":         "true",
					},
					{
						"__address__":                              "2.3.4.5:9001",
						"__meta_kubernetes_endpoint_port_name":     "testport",
						"__meta_kubernetes_endpoint_port_protocol": "TCP",
						"__meta_kubernetes_endpoint_ready":         "true",
					},
					{
						"__address__":                              "2.3.4.5:9001",
						"__meta_kubernetes_endpoint_port_name":     "testport",
						"__meta_kubernetes_endpoint_port_protocol": "TCP",
						"__meta_kubernetes_endpoint_ready":         "false",
					},
				},
				Labels: model.LabelSet{
					"__meta_kubernetes_namespace":               "default",
					"__meta_kubernetes_endpoints_name":          "testendpoints",
					"__meta_kubernetes_service_label_app":       "svc",
					"__meta_kubernetes_service_name":            "testendpoints",
					"__meta_kubernetes_service_label_component": "testing",
				},
				Source: "endpoints/default/testendpoints",
			},
		},
	}.Run(t)
}