package main_test

import (
	"os/exec"
	"testing"
)

// requireGit skips a parity case when git is unavailable (the git-backed gates
// fail open / skip without it, so a parity assertion would be meaningless).
func requireGit(t *testing.T) {
	t.Helper()
	if _, err := exec.LookPath("git"); err != nil {
		t.Skip("git not available; skipping git-backed parity case")
	}
}

// runGit runs a git subcommand in dir and fails the test on error.
func runGit(t *testing.T, dir string, args ...string) {
	t.Helper()
	cmd := exec.Command("git", append([]string{"-C", dir}, args...)...)
	if out, err := cmd.CombinedOutput(); err != nil {
		t.Fatalf("git %v: %v\n%s", args, err, out)
	}
}

// initGitRepo initialises a fresh, self-contained git repo in dir (local identity
// + no signing, so `commit` never depends on the host's global config).
func initGitRepo(t *testing.T, dir string) {
	t.Helper()
	runGit(t, dir, "init", "-q")
	runGit(t, dir, "config", "user.email", "test@example.com")
	runGit(t, dir, "config", "user.name", "Test")
	runGit(t, dir, "config", "commit.gpgsign", "false")
}

// gitCommitAll stages every change and commits it.
func gitCommitAll(t *testing.T, dir, msg string) {
	t.Helper()
	runGit(t, dir, "add", "-A")
	runGit(t, dir, "commit", "-q", "-m", msg)
}