CONVENTIONAL_PROMPT = """Generate a conventional commit message for these changes.
Format: <type>(<scope>): <description>

Types: feat, fix, docs, style, refactor, test, chore

Changes:
{diff}

Recent commits for context:
{history}

Respond with only the commit message."""

DEFAULT_PROMPT = """Generate a concise commit message for these changes.

Changes:
{diff}

Recent commits for context:
{history}

Respond with only the commit message."""

def build_prompt(diff, conventional=False, history=None):
    """Build prompt for commit message generation."""
    diff_text = "\n".join(diff) if isinstance(diff, list) else str(diff)
    history_text = "\n".join(history) if history else "No previous commits"
    
    template = CONVENTIONAL_PROMPT if conventional else DEFAULT_PROMPT
    return template.format(diff=diff_text, history=history_text)