package ldap

import (
	"testing"

	"github.com/hashicorp/go-hclog"
	"github.com/vjeantet/goldap/message"
	ldap "github.com/vjeantet/ldapserver"
)

// recordingWriter captures everything written to it so tests can
// assert on the exact sequence of responses a handler produces.
type recordingWriter struct {
	responses []message.ProtocolOp
}

func (w *recordingWriter) Write(po message.ProtocolOp) {
	w.responses = append(w.responses, po)
}

func testLogger() hclog.Logger { return hclog.NewNullLogger() }

func TestGuardRecoversPanic(t *testing.T) {
	s := &server{l: testLogger()}

	failed := false
	fail := func(ldap.ResponseWriter) { failed = true }

	h := s.guard(func(w ldap.ResponseWriter, m *ldap.Message) {
		panic("boom")
	}, fail)

	w := &recordingWriter{}
	h(w, &ldap.Message{})

	if !failed {
		t.Error("the failure handler was not called after a panic")
	}
}

func TestGuardSilentAfterPartialWrite(t *testing.T) {
	s := &server{l: testLogger()}

	failed := false
	fail := func(ldap.ResponseWriter) { failed = true }

	h := s.guard(func(w ldap.ResponseWriter, m *ldap.Message) {
		w.Write(ldap.NewSearchResultEntry("cn=test"))
		panic("boom")
	}, fail)

	w := &recordingWriter{}
	h(w, &ldap.Message{})

	if failed {
		t.Error("the failure handler ran even though a response was already sent")
	}
	if len(w.responses) != 1 {
		t.Errorf("got %d responses, want 1", len(w.responses))
	}
}

func TestGuardPassesThrough(t *testing.T) {
	s := &server{l: testLogger()}

	h := s.guard(func(w ldap.ResponseWriter, m *ldap.Message) {
		w.Write(ldap.NewSearchResultDoneResponse(ldap.LDAPResultSuccess))
	}, failSearchError)

	w := &recordingWriter{}
	h(w, &ldap.Message{})

	if len(w.responses) != 1 {
		t.Fatalf("got %d responses, want 1", len(w.responses))
	}
	if _, ok := w.responses[0].(message.SearchResultDone); !ok {
		t.Errorf("response is %T, want message.SearchResultDone", w.responses[0])
	}
}