package main

import (
	"os"
	"path/filepath"
	"reflect"
	"testing"
)

func catalogue(t *testing.T, manifests map[string]string) string {
	t.Helper()
	root := t.TempDir()
	for name, body := range manifests {
		dir := filepath.Join(root, "modules", name)
		if err := os.MkdirAll(dir, 0o755); err != nil {
			t.Fatal(err)
		}
		if err := os.WriteFile(filepath.Join(dir, "module.json"), []byte(body), 0o644); err != nil {
			t.Fatal(err)
		}
	}
	return root
}

func TestOnlyTheOwnerDeclaresAToolchainPackage(t *testing.T) {
	root := catalogue(t, map[string]string{
		"go":      `{"module":"go","resources":[{"id":"go","type":"package","package":"go"}]}`,
		"nodejs":  `{"module":"nodejs","resources":[{"id":"nodejs","type":"package","package":"nodejs"},{"id":"npm","type":"package","package":"npm"}]}`,
		"lab":     `{"module":"lab","resources":[{"id":"git","type":"package","package":"git"},{"id":"go","type":"package","package":"go"}]}`,
		"builder": `{"module":"builder","resources":[{"id":"n","type":"package","package":"nodejs"},{"id":"dir","type":"directory","path":"/go"}]}`,
	})
	got, err := Check(root)
	if err != nil {
		t.Fatal(err)
	}
	want := []Finding{{Module: "builder", Package: "nodejs", Owner: "nodejs"}, {Module: "lab", Package: "go", Owner: "go"}}
	if !reflect.DeepEqual(got, want) {
		t.Errorf("found %v, want %v", got, want)
	}
}

func TestTheOwnersMustExistAndDeclareTheirPackages(t *testing.T) {
	root := catalogue(t, map[string]string{
		"go": `{"module":"go","resources":[]}`,
	})
	got, err := Check(root)
	if err != nil {
		t.Fatal(err)
	}
	if len(got) != 3 {
		t.Errorf("an owner missing its packages gave %v, want three findings (go, nodejs, npm)", got)
	}
}

// The catalogue as it stands: this is the check itself, run here too.
func TestTheCatalogueGivesEachToolchainPackageToItsOwnerAlone(t *testing.T) {
	got, err := Check("../..")
	if err != nil {
		t.Fatal(err)
	}
	if len(got) != 0 {
		t.Errorf("the catalogue declares a toolchain package outside its owner: %v", got)
	}
}