package forward

import (
	"testing"

	"github.com/coredns/coredns/plugin/pkg/dnstest"
	"github.com/coredns/coredns/plugin/pkg/transport"
	"github.com/coredns/coredns/plugin/test"
	"github.com/coredns/coredns/request"

	"github.com/miekg/dns"
)

func TestForward(t *testing.T) {
	s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
		ret := new(dns.Msg)
		ret.SetReply(r)
		ret.Answer = append(ret.Answer, test.A("example.org. IN A 127.0.0.1"))
		w.WriteMsg(ret)
	})
	defer s.Close()

	p := NewProxy(s.Addr, transport.DNS)
	f := New()
	f.SetProxy(p)
	defer f.Close()

	state := request.Request{W: &test.ResponseWriter{}, Req: new(dns.Msg)}
	state.Req.SetQuestion("example.org.", dns.TypeA)
	resp, err := f.Forward(state)
	if err != nil {
		t.Fatal("Expected to receive reply, but didn't")
	}
	// expect answer section with A record in it
	if len(resp.Answer) == 0 {
		t.Fatalf("Expected to at least one RR in the answer section, got none: %s", resp)
	}
	if resp.Answer[0].Header().Rrtype != dns.TypeA {
		t.Errorf("Expected RR to A, got: %d", resp.Answer[0].Header().Rrtype)
	}
	if resp.Answer[0].(*dns.A).A.String() != "127.0.0.1" {
		t.Errorf("Expected 127.0.0.1, got: %s", resp.Answer[0].(*dns.A).A.String())
	}
}

func TestForwardRefused(t *testing.T) {
	s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
		ret := new(dns.Msg)
		ret.SetReply(r)
		ret.Rcode = dns.RcodeRefused
		w.WriteMsg(ret)
	})
	defer s.Close()

	p := NewProxy(s.Addr, transport.DNS)
	f := New()
	f.SetProxy(p)
	defer f.Close()

	state := request.Request{W: &test.ResponseWriter{}, Req: new(dns.Msg)}
	state.Req.SetQuestion("example.org.", dns.TypeA)
	resp, err := f.Forward(state)
	if err != nil {
		t.Fatal("Expected to receive reply, but didn't")
	}
	if resp.Rcode != dns.RcodeRefused {
		t.Errorf("Expected rcode to be %d, got %d", dns.RcodeRefused, resp.Rcode)
	}
}