import os
from pathlib import Path
from typing import Any, Dict, Optional

import yaml


class ConfigManager:
    """Configuration management utilities for YAML config"""

    def __init__(self, config_path: Optional[Path] = None):
        if config_path is None:
            # Use default location in user's home directory
            self.config_path = Path.home() / ".garmin-sync" / "config.yaml"
            self.config_path.parent.mkdir(exist_ok=True)
        else:
            self.config_path = config_path
            self.config_path.parent.mkdir(parents=True, exist_ok=True)

        self.config = self._load_config()

    def _load_config(self) -> Dict[str, Any]:
        """Load configuration from YAML file"""
        if self.config_path.exists():
            with open(self.config_path, "r") as f:
                return yaml.safe_load(f) or {}
        else:
            # Return default configuration
            default_config = {
                "api_base_url": "https://api.garmin.com",
                "default_timeout": 30,
                "output_format": "table",  # Options: table, json, csv
                "remember_login": True,
            }
            self._save_config(default_config)
            return default_config

    def _save_config(self, config: Dict[str, Any]) -> None:
        """Save configuration to YAML file"""
        with open(self.config_path, "w") as f:
            yaml.dump(config, f)

    def get(self, key: str, default: Any = None) -> Any:
        """Get a configuration value"""
        return self.config.get(key, default)

    def set(self, key: str, value: Any) -> None:
        """Set a configuration value"""
        self.config[key] = value
        self._save_config(self.config)

    def update(self, updates: Dict[str, Any]) -> None:
        """Update multiple configuration values"""
        self.config.update(updates)
        self._save_config(self.config)