package kubernetes

import (
	"testing"

	"github.com/coredns/coredns/plugin/etcd/msg"
	"github.com/coredns/coredns/plugin/kubernetes/object"
	"github.com/coredns/coredns/plugin/pkg/watch"
	"github.com/coredns/coredns/plugin/test"
	"github.com/coredns/coredns/request"

	"github.com/miekg/dns"
	api "k8s.io/api/core/v1"
	meta "k8s.io/apimachinery/pkg/apis/meta/v1"
)

var extCases = []struct {
	Qname string
	Qtype uint16
	Msg   []msg.Service
	Rcode int
}{
	{
		Qname: "svc1.testns.example.org.", Rcode: dns.RcodeSuccess,
		Msg: []msg.Service{
			msg.Service{Host: "1.2.3.4", Port: 80, TTL: 5, Key: "/c/org/example/testns/svc1"},
		},
	},
	{
		Qname: "svc6.testns.example.org.", Rcode: dns.RcodeSuccess,
		Msg: []msg.Service{
			msg.Service{Host: "1:2::5", Port: 80, TTL: 5, Key: "/c/org/example/testns/svc1"},
		},
	},
	{
		Qname: "*._not-udp-or-tcp.svc1.testns.example.com.", Rcode: dns.RcodeSuccess,
	},
	{
		Qname: "_http._tcp.svc1.testns.example.com.", Rcode: dns.RcodeSuccess,
		Msg: []msg.Service{
			msg.Service{Host: "1.2.3.4", Port: 80, TTL: 5, Key: "/c/org/example/testns/svc1"},
		},
	},
	{
		Qname: "svc0.testns.example.com.", Rcode: dns.RcodeNameError,
	},
	{
		Qname: "svc0.svc-nons.example.com.", Rcode: dns.RcodeNameError,
	},
}

func TestExternal(t *testing.T) {
	k := New([]string{"cluster.local."})
	k.APIConn = &external{}
	k.Next = test.NextHandler(dns.RcodeSuccess, nil)
	k.Namespaces = map[string]struct{}{"testns": struct{}{}}

	for i, tc := range extCases {
		state := testRequest(tc.Qname)

		svc, rcode := k.External(state)

		if x := tc.Rcode; x != rcode {
			t.Errorf("Test %d, expected rcode %d, got %d", i, x, rcode)
		}

		if len(svc) != len(tc.Msg) {
			t.Errorf("Test %d, expected %d for messages, got %d", i, len(tc.Msg), len(svc))
		}

		for j, s := range svc {
			if x := tc.Msg[j].Key; x != s.Key {
				t.Errorf("Test %d, expected key %s, got %s", i, x, s.Key)
			}
			return
		}
	}
}

type external struct{}

func (external) HasSynced() bool                              { return true }
func (external) Run()                                         { return }
func (external) Stop() error                                  { return nil }
func (external) EpIndexReverse(string) []*object.Endpoints    { return nil }
func (external) SvcIndexReverse(string) []*object.Service     { return nil }
func (external) Modified() int64                              { return 0 }
func (external) SetWatchChan(watch.Chan)                      {}
func (external) Watch(string) error                           { return nil }
func (external) StopWatching(string)                          {}
func (external) EpIndex(s string) []*object.Endpoints         { return nil }
func (external) EndpointsList() []*object.Endpoints           { return nil }
func (external) GetNodeByName(name string) (*api.Node, error) { return nil, nil }
func (external) SvcIndex(s string) []*object.Service          { return svcIndexExternal[s] }
func (external) PodIndex(string) []*object.Pod                { return nil }

func (external) GetNamespaceByName(name string) (*api.Namespace, error) {
	return &api.Namespace{
		ObjectMeta: meta.ObjectMeta{
			Name: name,
		},
	}, nil
}

var svcIndexExternal = map[string][]*object.Service{
	"svc1.testns": {
		{
			Name:        "svc1",
			Namespace:   "testns",
			Type:        api.ServiceTypeClusterIP,
			ClusterIP:   "10.0.0.1",
			ExternalIPs: []string{"1.2.3.4"},
			Ports:       []api.ServicePort{{Name: "http", Protocol: "tcp", Port: 80}},
		},
	},
	"svc6.testns": {
		{
			Name:        "svc6",
			Namespace:   "testns",
			Type:        api.ServiceTypeClusterIP,
			ClusterIP:   "10.0.0.3",
			ExternalIPs: []string{"1:2::5"},
			Ports:       []api.ServicePort{{Name: "http", Protocol: "tcp", Port: 80}},
		},
	},
}

func (external) ServiceList() []*object.Service {
	var svcs []*object.Service
	for _, svc := range svcIndexExternal {
		svcs = append(svcs, svc...)
	}
	return svcs
}

func testRequest(name string) request.Request {
	m := new(dns.Msg).SetQuestion(name, dns.TypeA)
	return request.Request{W: &test.ResponseWriter{}, Req: m, Zone: "example.org."}
}