package lint

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

// What this repository no longer holds (R4g, design 47 acceptance test 24): the checker runs the build module's own steps
// and the repository's tests, so no script of the repository stands in for them. A file named here came back.

// root is this repository's root, from the package's directory.
const root = "../.."

func TestTheRepositoryHoldsNoMergeCheckScript(t *testing.T) {
	for _, name := range []string{"merge-check.sh", "check-nested-modules.sh", "RELEASE-57.md", "testdata/store-tests"} {
		if _, err := os.Stat(filepath.Join(root, name)); err == nil {
			t.Errorf("%s is in the repository: the checker (ADR 0501 §5) runs its steps, and no script of the repository "+
				"stands in for it", name)
		}
	}
}

// sources are the controller's own Go files that are not tests: what the controller does, not what a test stands in for.
func sources(t *testing.T) map[string]string {
	t.Helper()
	out := map[string]string{}
	err := filepath.WalkDir(root, func(path string, d os.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if d.IsDir() && (d.Name() == ".git" || d.Name() == "testdata" || d.Name() == "vendor") {
			return filepath.SkipDir
		}
		if d.IsDir() || !strings.HasSuffix(path, ".go") || strings.HasSuffix(path, "_test.go") {
			return nil
		}
		raw, err := os.ReadFile(path)
		if err != nil {
			return err
		}
		out[path] = string(raw)
		return nil
	})
	if err != nil {
		t.Fatal(err)
	}
	return out
}

// The controller's tree holds no reference to a container runtime for a build (R4g, issue 1851): no socket of one, and no
// program run to build, pull or export an image. Builds are the build modules' (ADR 0501).
func TestTheControllerHoldsNoContainerRuntimeForABuild(t *testing.T) {
	for path, src := range sources(t) {
		for _, word := range []string{"docker.sock", `exec.Command("docker"`, `"docker", "pull"`, `"docker", "run"`, "buildah", "podman"} {
			if strings.Contains(src, word) {
				t.Errorf("%s names %s: a build runs on a build module, never through the controller", path, word)
			}
		}
	}
}

// No file of the controller names the forge's statuses of the retired merge check (issue 1299, issue 1318): a pull request
// into any repository asks the controller nothing, and the checker's `mesh/check` is the only status it need name.
func TestNoFileOfTheControllerNamesTheRetiredMergeStatuses(t *testing.T) {
	for path, src := range sources(t) {
		for _, word := range []string{"mesh/merge-gate", "mesh/repo-check", "StatusContextGate", "StatusContextRepoCheck"} {
			if strings.Contains(src, word) {
				t.Errorf("%s names %s, which the controller no longer asks, says or judges", path, word)
			}
		}
	}
}