import os
from typing import Any, Dict, Optional

import yaml


def load_config(config_path: Optional[str] = None) -> Dict[str, Any]:
    """Load configuration from file or use defaults."""
    if config_path and os.path.exists(config_path):
        with open(config_path, "r") as f:
            return yaml.safe_load(f) or {}

    default_paths = [
        ".git-insights/config.yaml",
        os.path.expanduser("~/.git-insights/config.yaml"),
    ]

    for path in default_paths:
        if os.path.exists(path):
            with open(path, "r") as f:
                return yaml.safe_load(f) or {}

    return get_default_config()


def get_default_config() -> Dict[str, Any]:
    """Return default configuration."""
    return {
        "repository_path": ".",
        "analysis_days": 30,
        "output_format": "json",
        "churn_threshold": 500,
        "risky_commit_threshold": 500,
        "merge_commit_flag": True,
    }