package public

import (
	"context"
	"errors"
	"reflect"
	"testing"
	"time"

	"github.com/prometheus/common/model"
	tap "github.com/runconduit/conduit/controller/gen/controller/tap"
	pb "github.com/runconduit/conduit/controller/gen/public"
	"github.com/runconduit/conduit/pkg/k8s"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/client-go/informers"
	"k8s.io/client-go/kubernetes/fake"
	"k8s.io/client-go/kubernetes/scheme"
	"k8s.io/client-go/tools/cache"
)

type statSumExpected struct {
	err     error
	k8sRes  []string
	promRes model.Value
	req     pb.StatSummaryRequest
	res     pb.StatSummaryResponse
}

func TestStatSummary(t *testing.T) {
	t.Run("Successfully performs a query based on resource type", func(t *testing.T) {
		expectations := []statSumExpected{
			statSumExpected{
				err: nil,
				k8sRes: []string{`
apiVersion: apps/v1
kind: Deployment
metadata:
  name: emoji
  namespace: emojivoto
spec:
  selector:
    matchLabels:
      app: emoji-svc
  strategy: {}
  template:
    spec:
      containers:
      - image: buoyantio/emojivoto-emoji-svc:v3
`, `
apiVersion: v1
kind: Pod
metadata:
  name: emojivoto-meshed
  namespace: emojivoto
  labels:
    app: emoji-svc
  annotations:
    conduit.io/proxy-version: testinjectversion
`, `
apiVersion: v1
kind: Pod
metadata:
  name: emojivoto-not-meshed
  namespace: emojivoto
  labels:
    app: emoji-svc
`,
				},
				promRes: model.Vector{
					&model.Sample{
						Metric:    model.Metric{"deployment": "emoji", "classification": "success"},
						Value:     123,
						Timestamp: 456,
					},
				},
				req: pb.StatSummaryRequest{
					Selector: &pb.ResourceSelection{
						Resource: &pb.Resource{
							Namespace: "emojivoto",
							Type:      k8s.KubernetesDeployments,
						},
					},
					TimeWindow: pb.TimeWindow_ONE_MIN,
				},
				res: pb.StatSummaryResponse{
					Response: &pb.StatSummaryResponse_Ok_{ // https://github.com/golang/protobuf/issues/205
						Ok: &pb.StatSummaryResponse_Ok{
							StatTables: []*pb.StatTable{
								&pb.StatTable{
									Table: &pb.StatTable_PodGroup_{
										PodGroup: &pb.StatTable_PodGroup{
											Rows: []*pb.StatTable_PodGroup_Row{
												&pb.StatTable_PodGroup_Row{
													Resource: &pb.Resource{
														Namespace: "emojivoto",
														Type:      "deployments",
														Name:      "emoji",
													},
													Stats: &pb.BasicStats{
														SuccessCount: 123,
														FailureCount: 0,
														LatencyMsP50: 123,
														LatencyMsP95: 123,
														LatencyMsP99: 123,
													},
													TimeWindow:     pb.TimeWindow_ONE_MIN,
													MeshedPodCount: 1,
													TotalPodCount:  2,
												},
											},
										},
									},
								},
							},
						},
					},
				},
			},
		}

		for _, exp := range expectations {
			k8sObjs := []runtime.Object{}
			for _, res := range exp.k8sRes {
				decode := scheme.Codecs.UniversalDeserializer().Decode
				obj, _, err := decode([]byte(res), nil, nil)
				if err != nil {
					t.Fatalf("could not decode yml: %s", err)
				}
				k8sObjs = append(k8sObjs, obj)
			}

			clientSet := fake.NewSimpleClientset(k8sObjs...)
			sharedInformers := informers.NewSharedInformerFactory(clientSet, 10*time.Minute)

			deployInformer := sharedInformers.Apps().V1().Deployments()
			podInformer := sharedInformers.Core().V1().Pods()

			fakeGrpcServer := newGrpcServer(
				&MockProm{Res: exp.promRes},
				&mockTelemetry{},
				tap.NewTapClient(nil),
				deployInformer.Lister(),
				podInformer.Lister(),
				"conduit",
			)
			stopCh := make(chan struct{})
			sharedInformers.Start(stopCh)
			if !cache.WaitForCacheSync(stopCh, deployInformer.Informer().HasSynced, podInformer.Informer().HasSynced) {
				t.Fatalf("timed out wait for caches to sync")
			}

			rsp, err := fakeGrpcServer.StatSummary(context.TODO(), &exp.req)
			if err != exp.err {
				t.Fatalf("Expected error: %s, Got: %s", exp.err, err)
			}

			if !reflect.DeepEqual(exp.res, *rsp) {
				t.Fatalf("Expected: %+v, Got: %+v", &exp.res, rsp)
			}
		}
	})

	t.Run("Given an invalid resource type, returns error", func(t *testing.T) {
		expectations := []statSumExpected{
			statSumExpected{
				err: errors.New("Unimplemented resource type: badtype"),
				req: pb.StatSummaryRequest{
					Selector: &pb.ResourceSelection{
						Resource: &pb.Resource{
							Type: "badtype",
						},
					},
				},
			},
			statSumExpected{
				err: errors.New("Unimplemented resource type: deployment"),
				req: pb.StatSummaryRequest{
					Selector: &pb.ResourceSelection{
						Resource: &pb.Resource{
							Type: "deployment",
						},
					},
				},
			},
			statSumExpected{
				err: errors.New("Unimplemented resource type: pod"),
				req: pb.StatSummaryRequest{
					Selector: &pb.ResourceSelection{
						Resource: &pb.Resource{
							Type: "pod",
						},
					},
				},
			},
		}

		for _, exp := range expectations {
			clientSet := fake.NewSimpleClientset()
			sharedInformers := informers.NewSharedInformerFactory(clientSet, 10*time.Minute)
			fakeGrpcServer := newGrpcServer(
				&MockProm{Res: exp.promRes},
				&mockTelemetry{},
				tap.NewTapClient(nil),
				sharedInformers.Apps().V1().Deployments().Lister(),
				sharedInformers.Core().V1().Pods().Lister(),
				"conduit",
			)

			_, err := fakeGrpcServer.StatSummary(context.TODO(), &exp.req)
			if err != nil || exp.err != nil {
				if (err == nil && exp.err != nil) ||
					(err != nil && exp.err == nil) ||
					(err.Error() != exp.err.Error()) {
					t.Fatalf("Unexpected error (Expected: %s, Got: %s)", exp.err, err)
				}
			}
		}
	})
}