package notify

import (
	"net"
	"testing"
)

func TestServerResolveOutboundTransportNilLogical(t *testing.T) {
	server := NewServer().(*ServerCommon)

	if route := server.resolveOutboundRoute(nil); route.logical != nil || route.transport != nil {
		t.Fatalf("nil logical route mismatch: %+v", route)
	}
	if transport := server.resolveOutboundTransport(nil); transport != nil {
		t.Fatalf("resolveOutboundTransport(nil) = %+v, want nil", transport)
	}
}

func TestServerResolveOutboundTransportUsesCurrentGeneration(t *testing.T) {
	server := NewServer().(*ServerCommon)

	firstLeft, firstRight := net.Pipe()
	defer firstRight.Close()
	logical := server.bootstrapAcceptedLogical("outbound-route", nil, firstLeft)
	if logical == nil {
		t.Fatal("bootstrapAcceptedLogical should return logical")
	}

	first := server.resolveOutboundTransport(logical)
	if first == nil {
		t.Fatal("initial outbound transport should exist")
	}
	if !first.IsCurrent() {
		t.Fatal("initial outbound transport should be current")
	}

	secondLeft, secondRight := net.Pipe()
	defer secondLeft.Close()
	defer secondRight.Close()
	if err := server.attachAcceptedLogicalTransport(logical, secondLeft.RemoteAddr(), secondLeft); err != nil {
		t.Fatalf("attachAcceptedLogicalTransport failed: %v", err)
	}

	second := server.resolveOutboundTransport(logical)
	if second == nil {
		t.Fatal("resolved outbound transport after reattach should exist")
	}
	if !second.IsCurrent() {
		t.Fatal("resolved outbound transport after reattach should be current")
	}
	if got, want := second.TransportGeneration(), logical.clientConnTransportGenerationSnapshot(); got != want {
		t.Fatalf("resolved outbound generation = %d, want %d", got, want)
	}
	if first.TransportGeneration() == second.TransportGeneration() {
		t.Fatalf("outbound generation should change after reattach: first=%d second=%d", first.TransportGeneration(), second.TransportGeneration())
	}
	if first.IsCurrent() {
		t.Fatal("first outbound transport should become stale after reattach")
	}
}