package controller

import (
	"sync"
	"time"

	"go.uber.org/zap"
	appsv1 "k8s.io/api/apps/v1"
	hpav1 "k8s.io/api/autoscaling/v1"
	hpav2 "k8s.io/api/autoscaling/v2beta1"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/intstr"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/kubernetes/fake"
	"k8s.io/client-go/tools/record"
	"k8s.io/client-go/util/workqueue"

	flaggerv1 "github.com/weaveworks/flagger/pkg/apis/flagger/v1alpha3"
	istiov1alpha1 "github.com/weaveworks/flagger/pkg/apis/istio/common/v1alpha1"
	istiov1alpha3 "github.com/weaveworks/flagger/pkg/apis/istio/v1alpha3"
	"github.com/weaveworks/flagger/pkg/canary"
	clientset "github.com/weaveworks/flagger/pkg/client/clientset/versioned"
	fakeFlagger "github.com/weaveworks/flagger/pkg/client/clientset/versioned/fake"
	informers "github.com/weaveworks/flagger/pkg/client/informers/externalversions"
	"github.com/weaveworks/flagger/pkg/logger"
	"github.com/weaveworks/flagger/pkg/metrics"
	"github.com/weaveworks/flagger/pkg/router"
)

var (
	alwaysReady        = func() bool { return true }
	noResyncPeriodFunc = func() time.Duration { return 0 }
)

type Mocks struct {
	canary        *flaggerv1.Canary
	kubeClient    kubernetes.Interface
	meshClient    clientset.Interface
	flaggerClient clientset.Interface
	deployer      canary.Controller
	ctrl          *Controller
	logger        *zap.SugaredLogger
	router        router.Interface
}

func SetupMocks(c *flaggerv1.Canary) Mocks {
	if c == nil {
		c = newTestCanary()
	}
	flaggerClient := fakeFlagger.NewSimpleClientset(c)

	// init kube clientset and register mock objects
	kubeClient := fake.NewSimpleClientset(
		newTestDeployment(),
		newTestService(),
		newTestHPA(),
		NewTestConfigMap(),
		NewTestConfigMapEnv(),
		NewTestConfigMapVol(),
		NewTestSecret(),
		NewTestSecretEnv(),
		NewTestSecretVol(),
	)

	logger, _ := logger.NewLogger("debug")

	// init controller
	flaggerInformerFactory := informers.NewSharedInformerFactory(flaggerClient, noResyncPeriodFunc())
	flaggerInformer := flaggerInformerFactory.Flagger().V1alpha3().Canaries()

	// init router
	rf := router.NewFactory(nil, kubeClient, flaggerClient, "annotationsPrefix", logger, flaggerClient)

	// init observer
	observerFactory, _ := metrics.NewFactory("fake", 5*time.Second)

	// init canary factory
	configTracker := canary.ConfigTracker{
		Logger:        logger,
		KubeClient:    kubeClient,
		FlaggerClient: flaggerClient,
	}
	canaryFactory := canary.NewFactory(kubeClient, flaggerClient, configTracker, []string{"app", "name"}, logger)

	ctrl := &Controller{
		kubeClient:      kubeClient,
		istioClient:     flaggerClient,
		flaggerClient:   flaggerClient,
		flaggerLister:   flaggerInformer.Lister(),
		flaggerSynced:   flaggerInformer.Informer().HasSynced,
		workqueue:       workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), controllerAgentName),
		eventRecorder:   &record.FakeRecorder{},
		logger:          logger,
		canaries:        new(sync.Map),
		flaggerWindow:   time.Second,
		canaryFactory:   canaryFactory,
		observerFactory: observerFactory,
		recorder:        metrics.NewRecorder(controllerAgentName, false),
		routerFactory:   rf,
	}
	ctrl.flaggerSynced = alwaysReady

	meshRouter := rf.MeshRouter("istio")

	return Mocks{
		canary:        c,
		deployer:      canaryFactory.Controller("Deployment"),
		logger:        logger,
		flaggerClient: flaggerClient,
		meshClient:    flaggerClient,
		kubeClient:    kubeClient,
		ctrl:          ctrl,
		router:        meshRouter,
	}
}

func NewTestConfigMap() *corev1.ConfigMap {
	return &corev1.ConfigMap{
		TypeMeta: metav1.TypeMeta{APIVersion: corev1.SchemeGroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      "podinfo-config-env",
		},
		Data: map[string]string{
			"color": "red",
		},
	}
}

func NewTestConfigMapV2() *corev1.ConfigMap {
	return &corev1.ConfigMap{
		TypeMeta: metav1.TypeMeta{APIVersion: corev1.SchemeGroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      "podinfo-config-env",
		},
		Data: map[string]string{
			"color":  "blue",
			"output": "console",
		},
	}
}

func NewTestConfigMapEnv() *corev1.ConfigMap {
	return &corev1.ConfigMap{
		TypeMeta: metav1.TypeMeta{APIVersion: corev1.SchemeGroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      "podinfo-config-all-env",
		},
		Data: map[string]string{
			"color": "red",
		},
	}
}

func NewTestConfigMapVol() *corev1.ConfigMap {
	return &corev1.ConfigMap{
		TypeMeta: metav1.TypeMeta{APIVersion: corev1.SchemeGroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      "podinfo-config-vol",
		},
		Data: map[string]string{
			"color": "red",
		},
	}
}

func NewTestSecret() *corev1.Secret {
	return &corev1.Secret{
		TypeMeta: metav1.TypeMeta{APIVersion: corev1.SchemeGroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      "podinfo-secret-env",
		},
		Type: corev1.SecretTypeOpaque,
		Data: map[string][]byte{
			"apiKey": []byte("test"),
		},
	}
}

func NewTestSecretV2() *corev1.Secret {
	return &corev1.Secret{
		TypeMeta: metav1.TypeMeta{APIVersion: corev1.SchemeGroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      "podinfo-secret-env",
		},
		Type: corev1.SecretTypeOpaque,
		Data: map[string][]byte{
			"apiKey": []byte("test2"),
		},
	}
}

func NewTestSecretEnv() *corev1.Secret {
	return &corev1.Secret{
		TypeMeta: metav1.TypeMeta{APIVersion: corev1.SchemeGroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      "podinfo-secret-all-env",
		},
		Type: corev1.SecretTypeOpaque,
		Data: map[string][]byte{
			"apiKey": []byte("test"),
		},
	}
}

func NewTestSecretVol() *corev1.Secret {
	return &corev1.Secret{
		TypeMeta: metav1.TypeMeta{APIVersion: corev1.SchemeGroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      "podinfo-secret-vol",
		},
		Type: corev1.SecretTypeOpaque,
		Data: map[string][]byte{
			"apiKey": []byte("test"),
		},
	}
}

func newTestCanary() *flaggerv1.Canary {
	cd := &flaggerv1.Canary{
		TypeMeta: metav1.TypeMeta{APIVersion: flaggerv1.SchemeGroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      "podinfo",
		},
		Spec: flaggerv1.CanarySpec{
			TargetRef: hpav1.CrossVersionObjectReference{
				Name:       "podinfo",
				APIVersion: "apps/v1",
				Kind:       "Deployment",
			},
			AutoscalerRef: &hpav1.CrossVersionObjectReference{
				Name:       "podinfo",
				APIVersion: "autoscaling/v2beta1",
				Kind:       "HorizontalPodAutoscaler",
			}, Service: flaggerv1.CanaryService{
				Port: 9898,
			}, CanaryAnalysis: flaggerv1.CanaryAnalysis{
				Threshold:  10,
				StepWeight: 10,
				MaxWeight:  50,
				Metrics: []flaggerv1.CanaryMetric{
					{
						Name:      "istio_requests_total",
						Threshold: 99,
						Interval:  "1m",
					},
					{
						Name:      "istio_request_duration_seconds_bucket",
						Threshold: 500,
						Interval:  "1m",
					},
				},
			},
		},
	}
	return cd
}

func newTestCanaryMirror() *flaggerv1.Canary {
	cd := newTestCanary()
	cd.Spec.CanaryAnalysis.Mirror = true
	return cd
}

func newTestCanaryAB() *flaggerv1.Canary {
	cd := &flaggerv1.Canary{
		TypeMeta: metav1.TypeMeta{APIVersion: flaggerv1.SchemeGroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      "podinfo",
		},
		Spec: flaggerv1.CanarySpec{
			TargetRef: hpav1.CrossVersionObjectReference{
				Name:       "podinfo",
				APIVersion: "apps/v1",
				Kind:       "Deployment",
			},
			AutoscalerRef: &hpav1.CrossVersionObjectReference{
				Name:       "podinfo",
				APIVersion: "autoscaling/v2beta1",
				Kind:       "HorizontalPodAutoscaler",
			}, Service: flaggerv1.CanaryService{
				Port: 9898,
			}, CanaryAnalysis: flaggerv1.CanaryAnalysis{
				Threshold:  10,
				Iterations: 10,
				Match: []istiov1alpha3.HTTPMatchRequest{
					{
						Headers: map[string]istiov1alpha1.StringMatch{
							"x-user-type": {
								Exact: "test",
							},
						},
					},
				},
				Metrics: []flaggerv1.CanaryMetric{
					{
						Name:      "istio_requests_total",
						Threshold: 99,
						Interval:  "1m",
					},
					{
						Name:      "istio_request_duration_seconds_bucket",
						Threshold: 500,
						Interval:  "1m",
					},
				},
			},
		},
	}
	return cd
}

func newTestDeployment() *appsv1.Deployment {
	d := &appsv1.Deployment{
		TypeMeta: metav1.TypeMeta{APIVersion: appsv1.SchemeGroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      "podinfo",
		},
		Spec: appsv1.DeploymentSpec{
			Selector: &metav1.LabelSelector{
				MatchLabels: map[string]string{
					"app": "podinfo",
				},
			},
			Template: corev1.PodTemplateSpec{
				ObjectMeta: metav1.ObjectMeta{
					Labels: map[string]string{
						"app": "podinfo",
					},
				},
				Spec: corev1.PodSpec{
					Containers: []corev1.Container{
						{
							Name:  "podinfo",
							Image: "quay.io/stefanprodan/podinfo:1.2.0",
							Command: []string{
								"./podinfo",
								"--port=9898",
							},
							Args:       nil,
							WorkingDir: "",
							Ports: []corev1.ContainerPort{
								{
									Name:          "http",
									ContainerPort: 9898,
									Protocol:      corev1.ProtocolTCP,
								},
								{
									Name:          "http-metrics",
									ContainerPort: 8080,
									Protocol:      corev1.ProtocolTCP,
								},
								{
									ContainerPort: 8888,
								},
							},
							Env: []corev1.EnvVar{
								{
									Name: "PODINFO_UI_COLOR",
									ValueFrom: &corev1.EnvVarSource{
										ConfigMapKeyRef: &corev1.ConfigMapKeySelector{
											LocalObjectReference: corev1.LocalObjectReference{
												Name: "podinfo-config-env",
											},
											Key: "color",
										},
									},
								},
								{
									Name: "API_KEY",
									ValueFrom: &corev1.EnvVarSource{
										SecretKeyRef: &corev1.SecretKeySelector{
											LocalObjectReference: corev1.LocalObjectReference{
												Name: "podinfo-secret-env",
											},
											Key: "apiKey",
										},
									},
								},
							},
							EnvFrom: []corev1.EnvFromSource{
								{
									ConfigMapRef: &corev1.ConfigMapEnvSource{
										LocalObjectReference: corev1.LocalObjectReference{
											Name: "podinfo-config-all-env",
										},
									},
								},
								{
									SecretRef: &corev1.SecretEnvSource{
										LocalObjectReference: corev1.LocalObjectReference{
											Name: "podinfo-secret-all-env",
										},
									},
								},
							},
							VolumeMounts: []corev1.VolumeMount{
								{
									Name:      "config",
									MountPath: "/etc/podinfo/config",
									ReadOnly:  true,
								},
								{
									Name:      "secret",
									MountPath: "/etc/podinfo/secret",
									ReadOnly:  true,
								},
							},
						},
					},
					Volumes: []corev1.Volume{
						{
							Name: "config",
							VolumeSource: corev1.VolumeSource{
								ConfigMap: &corev1.ConfigMapVolumeSource{
									LocalObjectReference: corev1.LocalObjectReference{
										Name: "podinfo-config-vol",
									},
								},
							},
						},
						{
							Name: "secret",
							VolumeSource: corev1.VolumeSource{
								Secret: &corev1.SecretVolumeSource{
									SecretName: "podinfo-secret-vol",
								},
							},
						},
					},
				},
			},
		},
	}

	return d
}

func newTestDeploymentV2() *appsv1.Deployment {
	d := &appsv1.Deployment{
		TypeMeta: metav1.TypeMeta{APIVersion: appsv1.SchemeGroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      "podinfo",
		},
		Spec: appsv1.DeploymentSpec{
			Selector: &metav1.LabelSelector{
				MatchLabels: map[string]string{
					"app": "podinfo",
				},
			},
			Template: corev1.PodTemplateSpec{
				ObjectMeta: metav1.ObjectMeta{
					Labels: map[string]string{
						"app": "podinfo",
					},
				},
				Spec: corev1.PodSpec{
					Containers: []corev1.Container{
						{
							Name:  "podinfo",
							Image: "quay.io/stefanprodan/podinfo:1.2.1",
							Ports: []corev1.ContainerPort{
								{
									Name:          "http",
									ContainerPort: 9898,
									Protocol:      corev1.ProtocolTCP,
								},
							},
							Command: []string{
								"./podinfo",
								"--port=9898",
							},
							Env: []corev1.EnvVar{
								{
									Name: "PODINFO_UI_COLOR",
									ValueFrom: &corev1.EnvVarSource{
										ConfigMapKeyRef: &corev1.ConfigMapKeySelector{
											LocalObjectReference: corev1.LocalObjectReference{
												Name: "podinfo-config-env",
											},
											Key: "color",
										},
									},
								},
								{
									Name: "API_KEY",
									ValueFrom: &corev1.EnvVarSource{
										SecretKeyRef: &corev1.SecretKeySelector{
											LocalObjectReference: corev1.LocalObjectReference{
												Name: "podinfo-secret-env",
											},
											Key: "apiKey",
										},
									},
								},
							},
							EnvFrom: []corev1.EnvFromSource{
								{
									ConfigMapRef: &corev1.ConfigMapEnvSource{
										LocalObjectReference: corev1.LocalObjectReference{
											Name: "podinfo-config-all-env",
										},
									},
								},
							},
							VolumeMounts: []corev1.VolumeMount{
								{
									Name:      "config",
									MountPath: "/etc/podinfo/config",
									ReadOnly:  true,
								},
								{
									Name:      "secret",
									MountPath: "/etc/podinfo/secret",
									ReadOnly:  true,
								},
							},
						},
					},
					Volumes: []corev1.Volume{
						{
							Name: "config",
							VolumeSource: corev1.VolumeSource{
								ConfigMap: &corev1.ConfigMapVolumeSource{
									LocalObjectReference: corev1.LocalObjectReference{
										Name: "podinfo-config-vol",
									},
								},
							},
						},
						{
							Name: "secret",
							VolumeSource: corev1.VolumeSource{
								Secret: &corev1.SecretVolumeSource{
									SecretName: "podinfo-secret-vol",
								},
							},
						},
					},
				},
			},
		},
	}

	return d
}

func newTestService() *corev1.Service {
	d := &corev1.Service{
		TypeMeta: metav1.TypeMeta{APIVersion: appsv1.SchemeGroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      "podinfo",
		},
		Spec: corev1.ServiceSpec{
			Selector: map[string]string{
				"app": "podinfo",
			},
			Type: corev1.ServiceTypeClusterIP,
			Ports: []corev1.ServicePort{
				{
					Name:       "http",
					Port:       9898,
					Protocol:   corev1.ProtocolTCP,
					TargetPort: intstr.FromString("http"),
				},
			},
		},
	}

	return d
}

func newTestServiceV2() *corev1.Service {
	d := &corev1.Service{
		TypeMeta: metav1.TypeMeta{APIVersion: appsv1.SchemeGroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      "podinfo",
		},
		Spec: corev1.ServiceSpec{
			Selector: map[string]string{
				"app": "podinfo-v2",
			},
			Type: corev1.ServiceTypeClusterIP,
			Ports: []corev1.ServicePort{
				{
					Name:       "http",
					Port:       9898,
					Protocol:   corev1.ProtocolTCP,
					TargetPort: intstr.FromString("http"),
				},
			},
		},
	}

	return d
}

func newTestHPA() *hpav2.HorizontalPodAutoscaler {
	h := &hpav2.HorizontalPodAutoscaler{
		TypeMeta: metav1.TypeMeta{APIVersion: hpav2.SchemeGroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      "podinfo",
		},
		Spec: hpav2.HorizontalPodAutoscalerSpec{
			ScaleTargetRef: hpav2.CrossVersionObjectReference{
				Name:       "podinfo",
				APIVersion: "apps/v1",
				Kind:       "Deployment",
			},
			Metrics: []hpav2.MetricSpec{
				{
					Type: "Resource",
					Resource: &hpav2.ResourceMetricSource{
						Name:                     "cpu",
						TargetAverageUtilization: int32p(99),
					},
				},
			},
		},
	}

	return h
}