/*
Copyright 2016 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 test

import (
	"fmt"
	"time"

	"net/http"
	"net/http/httptest"

	apiv1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/types"
	"k8s.io/client-go/kubernetes/scheme"
	refv1 "k8s.io/client-go/tools/reference"
	"k8s.io/kubernetes/pkg/api/testapi"

	"github.com/stretchr/testify/mock"
)

// BuildTestPod creates a pod with specified resources.
func BuildTestPod(name string, cpu int64, mem int64) *apiv1.Pod {
	pod := &apiv1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      name,
			SelfLink:  fmt.Sprintf("/api/v1/namespaces/default/pods/%s", name),
		},
		Spec: apiv1.PodSpec{
			Containers: []apiv1.Container{
				{
					Resources: apiv1.ResourceRequirements{
						Requests: apiv1.ResourceList{},
					},
				},
			},
		},
	}

	if cpu >= 0 {
		pod.Spec.Containers[0].Resources.Requests[apiv1.ResourceCPU] = *resource.NewMilliQuantity(cpu, resource.DecimalSI)
	}
	if mem >= 0 {
		pod.Spec.Containers[0].Resources.Requests[apiv1.ResourceMemory] = *resource.NewQuantity(mem, resource.DecimalSI)
	}

	return pod
}

const (
	// cannot use constants from gpu module due to cyclic package import
	resourceNvidiaGPU = "nvidia.com/gpu"
	gpuLabel          = "cloud.google.com/gke-accelerator"
	defaultGPUType    = "nvidia-tesla-k80"
)

// RequestGpuForPod modifies pod's resource requests by adding a number of GPUs to them.
func RequestGpuForPod(pod *apiv1.Pod, gpusCount int64) {
	if pod.Spec.Containers[0].Resources.Limits == nil {
		pod.Spec.Containers[0].Resources.Limits = apiv1.ResourceList{}
	}
	pod.Spec.Containers[0].Resources.Limits[resourceNvidiaGPU] = *resource.NewQuantity(gpusCount, resource.DecimalSI)

	if pod.Spec.Containers[0].Resources.Requests == nil {
		pod.Spec.Containers[0].Resources.Requests = apiv1.ResourceList{}
	}
	pod.Spec.Containers[0].Resources.Requests[resourceNvidiaGPU] = *resource.NewQuantity(gpusCount, resource.DecimalSI)
}

// BuildTestNode creates a node with specified capacity.
func BuildTestNode(name string, millicpu int64, mem int64) *apiv1.Node {
	node := &apiv1.Node{
		ObjectMeta: metav1.ObjectMeta{
			Name:     name,
			SelfLink: fmt.Sprintf("/api/v1/nodes/%s", name),
			Labels:   map[string]string{},
		},
		Spec: apiv1.NodeSpec{
			ProviderID: name,
		},
		Status: apiv1.NodeStatus{
			Capacity: apiv1.ResourceList{
				apiv1.ResourcePods: *resource.NewQuantity(100, resource.DecimalSI),
			},
		},
	}

	if millicpu >= 0 {
		node.Status.Capacity[apiv1.ResourceCPU] = *resource.NewMilliQuantity(millicpu, resource.DecimalSI)
	}
	if mem >= 0 {
		node.Status.Capacity[apiv1.ResourceMemory] = *resource.NewQuantity(mem, resource.DecimalSI)
	}

	node.Status.Allocatable = apiv1.ResourceList{}
	for k, v := range node.Status.Capacity {
		node.Status.Allocatable[k] = v
	}

	return node
}

// AddGpusToNode adds GPU capacity to given node. Default accelerator type is used.
func AddGpusToNode(node *apiv1.Node, gpusCount int64) {
	node.Spec.Taints = append(
		node.Spec.Taints,
		apiv1.Taint{
			Key:    resourceNvidiaGPU,
			Value:  "present",
			Effect: "NoSchedule",
		})
	node.Status.Capacity[resourceNvidiaGPU] = *resource.NewQuantity(gpusCount, resource.DecimalSI)
	node.Status.Allocatable[resourceNvidiaGPU] = *resource.NewQuantity(gpusCount, resource.DecimalSI)
	node.Labels[gpuLabel] = defaultGPUType
}

// SetNodeReadyState sets node ready state.
func SetNodeReadyState(node *apiv1.Node, ready bool, lastTransition time.Time) {
	for i := range node.Status.Conditions {
		if node.Status.Conditions[i].Type == apiv1.NodeReady {
			node.Status.Conditions[i].LastTransitionTime = metav1.Time{Time: lastTransition}
			if ready {
				node.Status.Conditions[i].Status = apiv1.ConditionTrue
			} else {
				node.Status.Conditions[i].Status = apiv1.ConditionFalse
			}
			return
		}
	}
	condition := apiv1.NodeCondition{
		Type:               apiv1.NodeReady,
		Status:             apiv1.ConditionTrue,
		LastTransitionTime: metav1.Time{Time: lastTransition},
	}
	if ready {
		condition.Status = apiv1.ConditionTrue
	} else {
		condition.Status = apiv1.ConditionFalse
	}
	node.Status.Conditions = append(node.Status.Conditions, condition)
}

// RefJSON builds string reference to
func RefJSON(o runtime.Object) string {
	ref, err := refv1.GetReference(scheme.Scheme, o)
	if err != nil {
		panic(err)
	}

	codec := testapi.Default.Codec()
	json := runtime.EncodeOrDie(codec, &apiv1.SerializedReference{Reference: *ref})
	return string(json)
}

// GenerateOwnerReferences builds OwnerReferences with a single reference
func GenerateOwnerReferences(name, kind, api string, uid types.UID) []metav1.OwnerReference {
	return []metav1.OwnerReference{
		{
			APIVersion:         api,
			Kind:               kind,
			Name:               name,
			BlockOwnerDeletion: boolptr(true),
			Controller:         boolptr(true),
			UID:                uid,
		},
	}
}

func boolptr(val bool) *bool {
	b := val
	return &b
}

// HttpServerMock mocks server HTTP.
//
// Example:
// // Create HttpServerMock.
// server := NewHttpServerMock()
// defer server.Close()
// // Use server.URL to point your code to HttpServerMock.
// g := newTestGceManager(t, server.URL, ModeGKE)
// // Declare handled urls and results for them.
// server.On("handle", "/project1/zones/us-central1-b/listManagedInstances").Return("<managedInstances>").Once()
// // Call http server in your code.
// instances, err := g.GetManagedInstances()
// // Check if expected calls were executed.
// 	mock.AssertExpectationsForObjects(t, server)
type HttpServerMock struct {
	mock.Mock
	*httptest.Server
}

// NewHttpServerMock creates new HttpServerMock.
func NewHttpServerMock() *HttpServerMock {
	httpServerMock := &HttpServerMock{}
	mux := http.NewServeMux()
	mux.HandleFunc("/",
		func(w http.ResponseWriter, req *http.Request) {
			result := httpServerMock.handle(req.URL.Path)
			w.Write([]byte(result))
		})

	server := httptest.NewServer(mux)
	httpServerMock.Server = server
	return httpServerMock
}

func (l *HttpServerMock) handle(url string) string {
	args := l.Called(url)
	return args.String(0)
}