package buildstep

import (
	"go/parser"
	"go/token"
	"path/filepath"
	"strconv"
	"strings"
	"testing"
)

// The layouts, keys and codecs of this package are read by modules that never touch the bus (a composer's tool, the
// builder's published package): it imports neither the bus library nor mesh-sdk's runtime (the root package), whose
// part that runs is package buildrun's.
func TestThePackageIsFreeOfTheBus(t *testing.T) {
	files, _ := filepath.Glob("*.go")
	fset := token.NewFileSet()
	for _, f := range files {
		if strings.HasSuffix(f, "_test.go") {
			continue
		}
		parsed, err := parser.ParseFile(fset, f, nil, parser.ImportsOnly)
		if err != nil {
			t.Fatal(err)
		}
		for _, imp := range parsed.Imports {
			path, _ := strconv.Unquote(imp.Path.Value)
			if strings.HasPrefix(path, "github.com/nats-io/") || path == "git.novox.be/novox/mesh-sdk/go" {
				t.Errorf("%s imports %s, which reaches the bus", f, path)
			}
		}
	}
}