package diagram

import (
	"testing"

	"modelRT/orm"

	"github.com/gofrs/uuid"
)

func TestTopologyGraphSupportsMultiParentReachability(t *testing.T) {
	startA := uuid.Must(uuid.NewV4())
	startB := uuid.Must(uuid.NewV4())
	shared := uuid.Must(uuid.NewV4())
	end := uuid.Must(uuid.NewV4())

	graph := NewTopologyGraph([]orm.Topologic{
		{UUIDFrom: startA, UUIDTo: shared},
		{UUIDFrom: startB, UUIDTo: shared},
		{UUIDFrom: shared, UUIDTo: end},
	})

	if len(graph.StartNodes) != 2 {
		t.Fatalf("expected 2 start nodes, got %d", len(graph.StartNodes))
	}
	if len(graph.InEdges[shared]) != 2 {
		t.Fatalf("expected shared node to keep 2 parents, got %d", len(graph.InEdges[shared]))
	}
	if !graph.IsReachable(startA, end) {
		t.Fatalf("expected %s to reach %s", startA, end)
	}
	if !graph.IsReachable(startB, end) {
		t.Fatalf("expected %s to reach %s", startB, end)
	}
}