//go:build integration

package buildstep

import (
	"context"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"

	"git.novox.be/novox/mesh-sdk/go/forgekey"
)

func gitIn(t *testing.T, dir string, args ...string) string {
	t.Helper()
	cmd := exec.Command("git", append([]string{"-C", dir, "-c", "user.name=t", "-c", "user.email=t@example.invalid"}, args...)...)
	out, err := cmd.CombinedOutput()
	if err != nil {
		t.Fatalf("git %v: %v\n%s", args, err, out)
	}
	return strings.TrimSpace(string(out))
}

// 1474/AC5: a local bare repository with a commit only under refs/pull/1/head (a file:// remote, allowed by the
// test-only option): the workspace's HEAD is the commit. The forge itself is proven live after the build
// modules' delivery (ADR 0466 §5).
func TestFetchCommitFromAPullRefOnly(t *testing.T) {
	root := t.TempDir()
	bare := filepath.Join(root, "r.git")
	work := filepath.Join(root, "work")
	for _, d := range []string{bare, work} {
		if err := os.MkdirAll(d, 0o755); err != nil {
			t.Fatal(err)
		}
	}
	gitIn(t, bare, "init", "-q", "--bare")
	gitIn(t, work, "init", "-q")
	if err := os.WriteFile(filepath.Join(work, "f"), []byte("x"), 0o644); err != nil {
		t.Fatal(err)
	}
	gitIn(t, work, "add", "f")
	gitIn(t, work, "commit", "-q", "-m", "pull request head")
	commit := gitIn(t, work, "rev-parse", "HEAD")
	gitIn(t, work, "push", "-q", bare, "HEAD:refs/pull/1/head")

	ws := filepath.Join(root, "ws")
	if err := os.MkdirAll(ws, 0o755); err != nil {
		t.Fatal(err)
	}
	err := FetchCommit(context.Background(), forgekey.ExecRunner, ws, "file://"+bare, commit, "refs/pull/1/head", AllowFileRemote())
	if err != nil {
		t.Fatal(err)
	}
	if head := gitIn(t, ws, "rev-parse", "HEAD"); head != commit {
		t.Errorf("HEAD = %s, want %s", head, commit)
	}
}