/*
Copyright 2014 The Kubernetes Authors All rights reserved.

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 factory

import (
	"net/http"
	"net/http/httptest"
	"reflect"
	"testing"
	"time"

	"k8s.io/kubernetes/pkg/api"
	"k8s.io/kubernetes/pkg/api/testapi"
	apitesting "k8s.io/kubernetes/pkg/api/testing"
	"k8s.io/kubernetes/pkg/client/cache"
	client "k8s.io/kubernetes/pkg/client/unversioned"
	"k8s.io/kubernetes/pkg/runtime"
	"k8s.io/kubernetes/pkg/types"
	utiltesting "k8s.io/kubernetes/pkg/util/testing"
	"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm"
	schedulerapi "k8s.io/kubernetes/plugin/pkg/scheduler/api"
	latestschedulerapi "k8s.io/kubernetes/plugin/pkg/scheduler/api/latest"
	"k8s.io/kubernetes/plugin/pkg/scheduler/schedulercache"
)

func TestCreate(t *testing.T) {
	handler := utiltesting.FakeHandler{
		StatusCode:   500,
		ResponseBody: "",
		T:            t,
	}
	server := httptest.NewServer(&handler)
	// TODO: Uncomment when fix #19254
	// defer server.Close()
	client := client.NewOrDie(&client.Config{Host: server.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
	factory := NewConfigFactory(client, api.DefaultSchedulerName)
	factory.Create()
}

// Test configures a scheduler from a policies defined in a file
// It combines some configurable predicate/priorities with some pre-defined ones
func TestCreateFromConfig(t *testing.T) {
	var configData []byte
	var policy schedulerapi.Policy

	handler := utiltesting.FakeHandler{
		StatusCode:   500,
		ResponseBody: "",
		T:            t,
	}
	server := httptest.NewServer(&handler)
	// TODO: Uncomment when fix #19254
	// defer server.Close()
	client := client.NewOrDie(&client.Config{Host: server.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
	factory := NewConfigFactory(client, api.DefaultSchedulerName)

	// Pre-register some predicate and priority functions
	RegisterFitPredicate("PredicateOne", PredicateOne)
	RegisterFitPredicate("PredicateTwo", PredicateTwo)
	RegisterPriorityFunction("PriorityOne", PriorityOne, 1)
	RegisterPriorityFunction("PriorityTwo", PriorityTwo, 1)

	configData = []byte(`{
		"kind" : "Policy",
		"apiVersion" : "v1",
		"predicates" : [
			{"name" : "TestZoneAffinity", "argument" : {"serviceAffinity" : {"labels" : ["zone"]}}},
			{"name" : "TestRequireZone", "argument" : {"labelsPresence" : {"labels" : ["zone"], "presence" : true}}},
			{"name" : "PredicateOne"},
			{"name" : "PredicateTwo"}
		],
		"priorities" : [
			{"name" : "RackSpread", "weight" : 3, "argument" : {"serviceAntiAffinity" : {"label" : "rack"}}},
			{"name" : "PriorityOne", "weight" : 2},
			{"name" : "PriorityTwo", "weight" : 1}		]
	}`)
	if err := runtime.DecodeInto(latestschedulerapi.Codec, configData, &policy); err != nil {
		t.Errorf("Invalid configuration: %v", err)
	}

	factory.CreateFromConfig(policy)
}

func TestCreateFromEmptyConfig(t *testing.T) {
	var configData []byte
	var policy schedulerapi.Policy

	handler := utiltesting.FakeHandler{
		StatusCode:   500,
		ResponseBody: "",
		T:            t,
	}
	server := httptest.NewServer(&handler)
	// TODO: Uncomment when fix #19254
	// defer server.Close()
	client := client.NewOrDie(&client.Config{Host: server.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
	factory := NewConfigFactory(client, api.DefaultSchedulerName)

	configData = []byte(`{}`)
	if err := runtime.DecodeInto(latestschedulerapi.Codec, configData, &policy); err != nil {
		t.Errorf("Invalid configuration: %v", err)
	}

	factory.CreateFromConfig(policy)
}

func PredicateOne(pod *api.Pod, nodeName string, nodeInfo *schedulercache.NodeInfo) (bool, error) {
	return true, nil
}

func PredicateTwo(pod *api.Pod, nodeName string, nodeInfo *schedulercache.NodeInfo) (bool, error) {
	return true, nil
}

func PriorityOne(pod *api.Pod, nodeNameToInfo map[string]*schedulercache.NodeInfo, nodeLister algorithm.NodeLister) (schedulerapi.HostPriorityList, error) {
	return []schedulerapi.HostPriority{}, nil
}

func PriorityTwo(pod *api.Pod, nodeNameToInfo map[string]*schedulercache.NodeInfo, nodeLister algorithm.NodeLister) (schedulerapi.HostPriorityList, error) {
	return []schedulerapi.HostPriority{}, nil
}

func TestDefaultErrorFunc(t *testing.T) {
	testPod := &api.Pod{
		ObjectMeta: api.ObjectMeta{Name: "foo", Namespace: "bar"},
		Spec:       apitesting.DeepEqualSafePodSpec(),
	}
	handler := utiltesting.FakeHandler{
		StatusCode:   200,
		ResponseBody: runtime.EncodeOrDie(testapi.Default.Codec(), testPod),
		T:            t,
	}
	mux := http.NewServeMux()

	// FakeHandler musn't be sent requests other than the one you want to test.
	mux.Handle(testapi.Default.ResourcePath("pods", "bar", "foo"), &handler)
	server := httptest.NewServer(mux)
	// TODO: Uncomment when fix #19254
	// defer server.Close()
	factory := NewConfigFactory(client.NewOrDie(&client.Config{Host: server.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}), api.DefaultSchedulerName)
	queue := cache.NewFIFO(cache.MetaNamespaceKeyFunc)
	podBackoff := podBackoff{
		perPodBackoff:   map[types.NamespacedName]*backoffEntry{},
		clock:           &fakeClock{},
		defaultDuration: 1 * time.Millisecond,
		maxDuration:     1 * time.Second,
	}
	errFunc := factory.makeDefaultErrorFunc(&podBackoff, queue)

	errFunc(testPod, nil)
	for {
		// This is a terrible way to do this but I plan on replacing this
		// whole error handling system in the future. The test will time
		// out if something doesn't work.
		time.Sleep(10 * time.Millisecond)
		got, exists, _ := queue.Get(testPod)
		if !exists {
			continue
		}
		handler.ValidateRequest(t, testapi.Default.ResourcePath("pods", "bar", "foo"), "GET", nil)
		if e, a := testPod, got; !reflect.DeepEqual(e, a) {
			t.Errorf("Expected %v, got %v", e, a)
		}
		break
	}
}

func TestNodeEnumerator(t *testing.T) {
	testList := &api.NodeList{
		Items: []api.Node{
			{ObjectMeta: api.ObjectMeta{Name: "foo"}},
			{ObjectMeta: api.ObjectMeta{Name: "bar"}},
			{ObjectMeta: api.ObjectMeta{Name: "baz"}},
		},
	}
	me := nodeEnumerator{testList}

	if e, a := 3, me.Len(); e != a {
		t.Fatalf("expected %v, got %v", e, a)
	}
	for i := range testList.Items {
		gotObj := me.Get(i)
		if e, a := testList.Items[i].Name, gotObj.(*api.Node).Name; e != a {
			t.Errorf("Expected %v, got %v", e, a)
		}
		if e, a := &testList.Items[i], gotObj; !reflect.DeepEqual(e, a) {
			t.Errorf("Expected %#v, got %v#", e, a)
		}
	}
}

type fakeClock struct {
	t time.Time
}

func (f *fakeClock) Now() time.Time {
	return f.t
}

func TestBind(t *testing.T) {
	table := []struct {
		binding *api.Binding
	}{
		{binding: &api.Binding{
			ObjectMeta: api.ObjectMeta{
				Namespace: api.NamespaceDefault,
				Name:      "foo",
			},
			Target: api.ObjectReference{
				Name: "foohost.kubernetes.mydomain.com",
			},
		}},
	}

	for _, item := range table {
		handler := utiltesting.FakeHandler{
			StatusCode:   200,
			ResponseBody: "",
			T:            t,
		}
		server := httptest.NewServer(&handler)
		// TODO: Uncomment when fix #19254
		// defer server.Close()
		client := client.NewOrDie(&client.Config{Host: server.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
		b := binder{client}

		if err := b.Bind(item.binding); err != nil {
			t.Errorf("Unexpected error: %v", err)
			continue
		}
		expectedBody := runtime.EncodeOrDie(testapi.Default.Codec(), item.binding)
		handler.ValidateRequest(t, testapi.Default.ResourcePath("bindings", api.NamespaceDefault, ""), "POST", &expectedBody)
	}
}

func TestBackoff(t *testing.T) {
	clock := fakeClock{}
	backoff := podBackoff{
		perPodBackoff:   map[types.NamespacedName]*backoffEntry{},
		clock:           &clock,
		defaultDuration: 1 * time.Second,
		maxDuration:     60 * time.Second,
	}

	tests := []struct {
		podID            types.NamespacedName
		expectedDuration time.Duration
		advanceClock     time.Duration
	}{
		{
			podID:            types.NamespacedName{Namespace: "default", Name: "foo"},
			expectedDuration: 1 * time.Second,
		},
		{
			podID:            types.NamespacedName{Namespace: "default", Name: "foo"},
			expectedDuration: 2 * time.Second,
		},
		{
			podID:            types.NamespacedName{Namespace: "default", Name: "foo"},
			expectedDuration: 4 * time.Second,
		},
		{
			podID:            types.NamespacedName{Namespace: "default", Name: "bar"},
			expectedDuration: 1 * time.Second,
			advanceClock:     120 * time.Second,
		},
		// 'foo' should have been gc'd here.
		{
			podID:            types.NamespacedName{Namespace: "default", Name: "foo"},
			expectedDuration: 1 * time.Second,
		},
	}

	for _, test := range tests {
		duration := backoff.getEntry(test.podID).getBackoff(backoff.maxDuration)
		if duration != test.expectedDuration {
			t.Errorf("expected: %s, got %s for %s", test.expectedDuration.String(), duration.String(), test.podID)
		}
		clock.t = clock.t.Add(test.advanceClock)
		backoff.gc()
	}
	fooID := types.NamespacedName{Namespace: "default", Name: "foo"}
	backoff.perPodBackoff[fooID].backoff = 60 * time.Second
	duration := backoff.getEntry(fooID).getBackoff(backoff.maxDuration)
	if duration != 60*time.Second {
		t.Errorf("expected: 60, got %s", duration.String())
	}
	// Verify that we split on namespaces correctly, same name, different namespace
	fooID.Namespace = "other"
	duration = backoff.getEntry(fooID).getBackoff(backoff.maxDuration)
	if duration != 1*time.Second {
		t.Errorf("expected: 1, got %s", duration.String())
	}
}

// TestResponsibleForPod tests if a pod with an annotation that should cause it to
// be picked up by the default scheduler, is in fact picked by the default scheduler
// Two schedulers are made in the test: one is default scheduler and other scheduler
// is of name "foo-scheduler". A pod must be picked up by at most one of the two
// schedulers.
func TestResponsibleForPod(t *testing.T) {
	handler := utiltesting.FakeHandler{
		StatusCode:   500,
		ResponseBody: "",
		T:            t,
	}
	server := httptest.NewServer(&handler)
	// TODO: Uncomment when fix #19254
	// defer server.Close()
	client := client.NewOrDie(&client.Config{Host: server.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
	// factory of "default-scheduler"
	factoryDefaultScheduler := NewConfigFactory(client, api.DefaultSchedulerName)
	// factory of "foo-scheduler"
	factoryFooScheduler := NewConfigFactory(client, "foo-scheduler")
	// scheduler annotaions to be tested
	schedulerAnnotationFitsDefault := map[string]string{"scheduler.alpha.kubernetes.io/name": "default-scheduler"}
	schedulerAnnotationFitsFoo := map[string]string{"scheduler.alpha.kubernetes.io/name": "foo-scheduler"}
	schedulerAnnotationFitsNone := map[string]string{"scheduler.alpha.kubernetes.io/name": "bar-scheduler"}
	tests := []struct {
		pod             *api.Pod
		pickedByDefault bool
		pickedByFoo     bool
	}{
		{
			// pod with no annotation "scheduler.alpha.kubernetes.io/name=<scheduler-name>" should be
			// picked by the default scheduler, NOT by the one of name "foo-scheduler"
			pod:             &api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo", Namespace: "bar"}},
			pickedByDefault: true,
			pickedByFoo:     false,
		},
		{
			// pod with annotation "scheduler.alpha.kubernetes.io/name=default-scheduler" should be picked
			// by the scheduler of name "default-scheduler", NOT by the one of name "foo-scheduler"
			pod:             &api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo", Namespace: "bar", Annotations: schedulerAnnotationFitsDefault}},
			pickedByDefault: true,
			pickedByFoo:     false,
		},
		{
			// pod with annotataion "scheduler.alpha.kubernetes.io/name=foo-scheduler" should be NOT
			// be picked by the scheduler of name "default-scheduler", but by the one of name "foo-scheduler"
			pod:             &api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo", Namespace: "bar", Annotations: schedulerAnnotationFitsFoo}},
			pickedByDefault: false,
			pickedByFoo:     true,
		},
		{
			// pod with annotataion "scheduler.alpha.kubernetes.io/name=foo-scheduler" should be NOT
			// be picked by niether the scheduler of name "default-scheduler" nor the one of name "foo-scheduler"
			pod:             &api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo", Namespace: "bar", Annotations: schedulerAnnotationFitsNone}},
			pickedByDefault: false,
			pickedByFoo:     false,
		},
	}

	for _, test := range tests {
		podOfDefault := factoryDefaultScheduler.responsibleForPod(test.pod)
		podOfFoo := factoryFooScheduler.responsibleForPod(test.pod)
		results := []bool{podOfDefault, podOfFoo}
		expected := []bool{test.pickedByDefault, test.pickedByFoo}
		if !reflect.DeepEqual(results, expected) {
			t.Errorf("expected: {%v, %v}, got {%v, %v}", test.pickedByDefault, test.pickedByFoo, podOfDefault, podOfFoo)
		}
	}
}
