package git

import (
	"os/exec"
	"strings"
	"testing"
)

func TestFormatCommitLine_nil(t *testing.T) {
	if got := FormatCommitLine(nil); got != "" {
		t.Errorf("FormatCommitLine(nil) = %q; want empty", got)
	}
}

func TestFormatCommitLine_valid(t *testing.T) {
	commit := &CommitInfo{
		ShortSHA: "abc1234",
		Message:  "Initial commit",
	}
	expected := "> Commit: abc1234 (Initial commit)\n"
	if got := FormatCommitLine(commit); got != expected {
		t.Errorf("FormatCommitLine() = %q; want %q", got, expected)
	}
}

func TestGetCommitInfo_no_git(t *testing.T) {
	cmd := exec.Command("git", "-C", "/nonexistent", "log", "-1", "--format=%h %s")
	output, err := cmd.Output()
	if err == nil {
		t.Fatalf("expected error from nonexistent path, got %s", string(output))
	}

	result := GetCommitInfo("/nonexistent")
	if result != nil {
		t.Errorf("GetCommitInfo(/nonexistent) = %v; want nil", result)
	}
}

func TestGetCommitInfo_no_commits(t *testing.T) {
	out, err := exec.Command("sh", "-c", "echo 'abc123'").Output()
	if err != nil {
		t.Skip("shell command failed")
	}
	parts := strings.SplitN(strings.TrimSpace(string(out)), " ", 2)
	if len(parts) < 2 {
		t.Skip("cannot verify single-part output")
	}
}