/*
Copyright 2014 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 predicates

import (
	"reflect"
	"testing"

	v1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	v1helper "k8s.io/kubernetes/pkg/apis/core/v1/helper"
	"k8s.io/kubernetes/pkg/scheduler/framework/plugins/nodename"
	"k8s.io/kubernetes/pkg/scheduler/framework/plugins/nodeports"
	"k8s.io/kubernetes/pkg/scheduler/framework/plugins/noderesources"
	schedulernodeinfo "k8s.io/kubernetes/pkg/scheduler/nodeinfo"
)

var (
	extendedResourceA = v1.ResourceName("example.com/aaa")
	hugePageResourceA = v1helper.HugePageResourceName(resource.MustParse("2Mi"))
)

func makeResources(milliCPU, memory, pods, extendedA, storage, hugePageA int64) v1.NodeResources {
	return v1.NodeResources{
		Capacity: v1.ResourceList{
			v1.ResourceCPU:              *resource.NewMilliQuantity(milliCPU, resource.DecimalSI),
			v1.ResourceMemory:           *resource.NewQuantity(memory, resource.BinarySI),
			v1.ResourcePods:             *resource.NewQuantity(pods, resource.DecimalSI),
			extendedResourceA:           *resource.NewQuantity(extendedA, resource.DecimalSI),
			v1.ResourceEphemeralStorage: *resource.NewQuantity(storage, resource.BinarySI),
			hugePageResourceA:           *resource.NewQuantity(hugePageA, resource.BinarySI),
		},
	}
}

func makeAllocatableResources(milliCPU, memory, pods, extendedA, storage, hugePageA int64) v1.ResourceList {
	return v1.ResourceList{
		v1.ResourceCPU:              *resource.NewMilliQuantity(milliCPU, resource.DecimalSI),
		v1.ResourceMemory:           *resource.NewQuantity(memory, resource.BinarySI),
		v1.ResourcePods:             *resource.NewQuantity(pods, resource.DecimalSI),
		extendedResourceA:           *resource.NewQuantity(extendedA, resource.DecimalSI),
		v1.ResourceEphemeralStorage: *resource.NewQuantity(storage, resource.BinarySI),
		hugePageResourceA:           *resource.NewQuantity(hugePageA, resource.BinarySI),
	}
}

func newResourcePod(usage ...schedulernodeinfo.Resource) *v1.Pod {
	containers := []v1.Container{}
	for _, req := range usage {
		containers = append(containers, v1.Container{
			Resources: v1.ResourceRequirements{Requests: req.ResourceList()},
		})
	}
	return &v1.Pod{
		Spec: v1.PodSpec{
			Containers: containers,
		},
	}
}

func newPodWithPort(hostPorts ...int) *v1.Pod {
	networkPorts := []v1.ContainerPort{}
	for _, port := range hostPorts {
		networkPorts = append(networkPorts, v1.ContainerPort{HostPort: int32(port)})
	}
	return &v1.Pod{
		Spec: v1.PodSpec{
			Containers: []v1.Container{
				{
					Ports: networkPorts,
				},
			},
		},
	}
}

func TestGeneralPredicates(t *testing.T) {
	resourceTests := []struct {
		pod      *v1.Pod
		nodeInfo *schedulernodeinfo.NodeInfo
		node     *v1.Node
		fits     bool
		name     string
		wErr     error
		reasons  []PredicateFailureReason
	}{
		{
			pod: &v1.Pod{},
			nodeInfo: schedulernodeinfo.NewNodeInfo(
				newResourcePod(schedulernodeinfo.Resource{MilliCPU: 9, Memory: 19})),
			node: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{Name: "machine1"},
				Status:     v1.NodeStatus{Capacity: makeResources(10, 20, 32, 0, 0, 0).Capacity, Allocatable: makeAllocatableResources(10, 20, 32, 0, 0, 0)},
			},
			fits: true,
			wErr: nil,
			name: "no resources/port/host requested always fits",
		},
		{
			pod: newResourcePod(schedulernodeinfo.Resource{MilliCPU: 8, Memory: 10}),
			nodeInfo: schedulernodeinfo.NewNodeInfo(
				newResourcePod(schedulernodeinfo.Resource{MilliCPU: 5, Memory: 19})),
			node: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{Name: "machine1"},
				Status:     v1.NodeStatus{Capacity: makeResources(10, 20, 32, 0, 0, 0).Capacity, Allocatable: makeAllocatableResources(10, 20, 32, 0, 0, 0)},
			},
			fits: false,
			wErr: nil,
			reasons: []PredicateFailureReason{
				&InsufficientResourceError{InsufficientResource: noderesources.InsufficientResource{ResourceName: v1.ResourceCPU, Requested: 8, Used: 5, Capacity: 10}},
				&InsufficientResourceError{InsufficientResource: noderesources.InsufficientResource{ResourceName: v1.ResourceMemory, Requested: 10, Used: 19, Capacity: 20}},
			},
			name: "not enough cpu and memory resource",
		},
		{
			pod: &v1.Pod{
				Spec: v1.PodSpec{
					NodeName: "machine2",
				},
			},
			nodeInfo: schedulernodeinfo.NewNodeInfo(),
			node: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{Name: "machine1"},
				Status:     v1.NodeStatus{Capacity: makeResources(10, 20, 32, 0, 0, 0).Capacity, Allocatable: makeAllocatableResources(10, 20, 32, 0, 0, 0)},
			},
			fits:    false,
			wErr:    nil,
			reasons: []PredicateFailureReason{&PredicateFailureError{nodename.Name, nodename.ErrReason}},
			name:    "host not match",
		},
		{
			pod:      newPodWithPort(123),
			nodeInfo: schedulernodeinfo.NewNodeInfo(newPodWithPort(123)),
			node: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{Name: "machine1"},
				Status:     v1.NodeStatus{Capacity: makeResources(10, 20, 32, 0, 0, 0).Capacity, Allocatable: makeAllocatableResources(10, 20, 32, 0, 0, 0)},
			},
			fits:    false,
			wErr:    nil,
			reasons: []PredicateFailureReason{&PredicateFailureError{nodeports.Name, nodeports.ErrReason}},
			name:    "hostport conflict",
		},
	}
	for _, test := range resourceTests {
		t.Run(test.name, func(t *testing.T) {
			test.nodeInfo.SetNode(test.node)
			fits, reasons, err := GeneralPredicates(test.pod, nil, test.nodeInfo)
			if err != nil {
				t.Errorf("unexpected error: %v", err)
			}
			if !fits && !reflect.DeepEqual(reasons, test.reasons) {
				t.Errorf("unexpected failure reasons: %v, want: %v", reasons, test.reasons)
			}
			if fits != test.fits {
				t.Errorf("expected: %v got %v", test.fits, fits)
			}
		})
	}
}