/*
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 config

import (
	"reflect"
	"sort"
	"sync"
	"testing"
	"time"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/watch"
	"k8s.io/client-go/tools/cache"
	"k8s.io/kubernetes/pkg/api"
)

type fakeLW struct {
	listResp  runtime.Object
	watchResp watch.Interface
}

func (lw fakeLW) List(options metav1.ListOptions) (runtime.Object, error) {
	return lw.listResp, nil
}

func (lw fakeLW) Watch(options metav1.ListOptions) (watch.Interface, error) {
	return lw.watchResp, nil
}

var _ cache.ListerWatcher = fakeLW{}

func TestNewServicesSourceApi_UpdatesAndMultipleServices(t *testing.T) {
	service1v1 := &api.Service{
		ObjectMeta: metav1.ObjectMeta{Namespace: "testnamespace", Name: "s1"},
		Spec:       api.ServiceSpec{Ports: []api.ServicePort{{Protocol: "TCP", Port: 10}}}}
	service1v2 := &api.Service{
		ObjectMeta: metav1.ObjectMeta{Namespace: "testnamespace", Name: "s1"},
		Spec:       api.ServiceSpec{Ports: []api.ServicePort{{Protocol: "TCP", Port: 20}}}}
	service2 := &api.Service{
		ObjectMeta: metav1.ObjectMeta{Namespace: "testnamespace", Name: "s2"},
		Spec:       api.ServiceSpec{Ports: []api.ServicePort{{Protocol: "TCP", Port: 30}}}}

	// Setup fake api client.
	fakeWatch := watch.NewFake()
	lw := fakeLW{
		listResp:  &api.ServiceList{Items: []api.Service{}},
		watchResp: fakeWatch,
	}

	stopCh := make(chan struct{})
	defer close(stopCh)

	ch := make(chan struct{})
	handler := newSvcHandler(t, nil, func() { ch <- struct{}{} })

	serviceConfig := newServiceConfig(lw, time.Minute)
	serviceConfig.RegisterHandler(handler)
	go serviceConfig.Run(stopCh)

	// Add the first service
	handler.expected = []*api.Service{service1v1}
	fakeWatch.Add(service1v1)
	<-ch

	// Add another service
	handler.expected = []*api.Service{service1v1, service2}
	fakeWatch.Add(service2)
	<-ch

	// Modify service1
	handler.expected = []*api.Service{service1v2, service2}
	fakeWatch.Modify(service1v2)
	<-ch

	// Delete service1
	handler.expected = []*api.Service{service2}
	fakeWatch.Delete(service1v2)
	<-ch

	// Delete service2
	handler.expected = []*api.Service{}
	fakeWatch.Delete(service2)
	<-ch
}

func TestNewEndpointsSourceApi_UpdatesAndMultipleEndpoints(t *testing.T) {
	endpoints1v1 := &api.Endpoints{
		ObjectMeta: metav1.ObjectMeta{Namespace: "testnamespace", Name: "e1"},
		Subsets: []api.EndpointSubset{{
			Addresses: []api.EndpointAddress{
				{IP: "1.2.3.4"},
			},
			Ports: []api.EndpointPort{{Port: 8080, Protocol: "TCP"}},
		}},
	}
	endpoints1v2 := &api.Endpoints{
		ObjectMeta: metav1.ObjectMeta{Namespace: "testnamespace", Name: "e1"},
		Subsets: []api.EndpointSubset{{
			Addresses: []api.EndpointAddress{
				{IP: "1.2.3.4"},
				{IP: "4.3.2.1"},
			},
			Ports: []api.EndpointPort{{Port: 8080, Protocol: "TCP"}},
		}},
	}
	endpoints2 := &api.Endpoints{
		ObjectMeta: metav1.ObjectMeta{Namespace: "testnamespace", Name: "e2"},
		Subsets: []api.EndpointSubset{{
			Addresses: []api.EndpointAddress{
				{IP: "5.6.7.8"},
			},
			Ports: []api.EndpointPort{{Port: 80, Protocol: "TCP"}},
		}},
	}

	// Setup fake api client.
	fakeWatch := watch.NewFake()
	lw := fakeLW{
		listResp:  &api.EndpointsList{Items: []api.Endpoints{}},
		watchResp: fakeWatch,
	}

	stopCh := make(chan struct{})
	defer close(stopCh)

	ch := make(chan struct{})
	handler := newEpsHandler(t, nil, func() { ch <- struct{}{} })

	endpointsConfig := newEndpointsConfig(lw, time.Minute)
	endpointsConfig.RegisterHandler(handler)
	go endpointsConfig.Run(stopCh)

	// Add the first endpoints
	handler.expected = []*api.Endpoints{endpoints1v1}
	fakeWatch.Add(endpoints1v1)
	<-ch

	// Add another endpoints
	handler.expected = []*api.Endpoints{endpoints1v1, endpoints2}
	fakeWatch.Add(endpoints2)
	<-ch

	// Modify endpoints1
	handler.expected = []*api.Endpoints{endpoints1v2, endpoints2}
	fakeWatch.Modify(endpoints1v2)
	<-ch

	// Delete endpoints1
	handler.expected = []*api.Endpoints{endpoints2}
	fakeWatch.Delete(endpoints1v2)
	<-ch

	// Delete endpoints2
	handler.expected = []*api.Endpoints{}
	fakeWatch.Delete(endpoints2)
	<-ch
}

type svcHandler struct {
	t        *testing.T
	expected []*api.Service
	done     func()
}

func newSvcHandler(t *testing.T, svcs []*api.Service, done func()) *svcHandler {
	return &svcHandler{t: t, expected: svcs, done: done}
}

func (s *svcHandler) OnServiceUpdate(services []*api.Service) {
	defer s.done()
	sort.Sort(sortedServices(services))
	if !reflect.DeepEqual(s.expected, services) {
		s.t.Errorf("Unexpected services: %#v, expected: %#v", services, s.expected)
	}
}

type epsHandler struct {
	t        *testing.T
	expected []*api.Endpoints
	done     func()
}

func newEpsHandler(t *testing.T, eps []*api.Endpoints, done func()) *epsHandler {
	return &epsHandler{t: t, expected: eps, done: done}
}

func (e *epsHandler) OnEndpointsUpdate(endpoints []*api.Endpoints) {
	defer e.done()
	sort.Sort(sortedEndpoints(endpoints))
	if !reflect.DeepEqual(e.expected, endpoints) {
		e.t.Errorf("Unexpected endpoints: %#v, expected: %#v", endpoints, e.expected)
	}
}

func TestInitialSync(t *testing.T) {
	svc1 := &api.Service{
		ObjectMeta: metav1.ObjectMeta{Namespace: "testnamespace", Name: "foo"},
		Spec:       api.ServiceSpec{Ports: []api.ServicePort{{Protocol: "TCP", Port: 10}}},
	}
	svc2 := &api.Service{
		ObjectMeta: metav1.ObjectMeta{Namespace: "testnamespace", Name: "bar"},
		Spec:       api.ServiceSpec{Ports: []api.ServicePort{{Protocol: "TCP", Port: 10}}},
	}
	eps1 := &api.Endpoints{
		ObjectMeta: metav1.ObjectMeta{Namespace: "testnamespace", Name: "foo"},
	}
	eps2 := &api.Endpoints{
		ObjectMeta: metav1.ObjectMeta{Namespace: "testnamespace", Name: "bar"},
	}

	var wg sync.WaitGroup
	// Wait for both services and endpoints handler.
	wg.Add(2)

	// Setup fake api client.
	fakeSvcWatch := watch.NewFake()
	svcLW := fakeLW{
		listResp:  &api.ServiceList{Items: []api.Service{*svc1, *svc2}},
		watchResp: fakeSvcWatch,
	}
	fakeEpsWatch := watch.NewFake()
	epsLW := fakeLW{
		listResp:  &api.EndpointsList{Items: []api.Endpoints{*eps2, *eps1}},
		watchResp: fakeEpsWatch,
	}

	svcConfig := newServiceConfig(svcLW, time.Minute)
	epsConfig := newEndpointsConfig(epsLW, time.Minute)
	svcHandler := newSvcHandler(t, []*api.Service{svc2, svc1}, wg.Done)
	svcConfig.RegisterHandler(svcHandler)
	epsHandler := newEpsHandler(t, []*api.Endpoints{eps2, eps1}, wg.Done)
	epsConfig.RegisterHandler(epsHandler)

	stopCh := make(chan struct{})
	defer close(stopCh)
	go svcConfig.Run(stopCh)
	go epsConfig.Run(stopCh)
	wg.Wait()
}