"""
Configuration utilities for loading and managing settings.
"""
import yaml
import os
import shutil
from datetime import datetime
from typing import Dict, Tuple


def load_config(config_path: str = "config.yaml") -> Dict:
    """Load configuration from YAML file."""
    if not os.path.exists(config_path):
        raise FileNotFoundError(f"Config file not found: {config_path}")

    with open(config_path, "r") as f:
        config = yaml.safe_load(f)

    return config


def create_directories(config: Dict):
    """Create necessary directories for checkpoints and logs."""
    checkpoint_dir = config["training"]["checkpoint_dir"]
    log_dir = config["training"]["log_dir"]

    os.makedirs(checkpoint_dir, exist_ok=True)
    os.makedirs(log_dir, exist_ok=True)


def create_run_directory(config: Dict, config_path: str = "config.yaml") -> Tuple[str, str, str]:
    """
    Create a timestamped run directory for this training session.

    Args:
        config: Configuration dictionary
        config_path: Path to the config file

    Returns:
        Tuple of (run_dir, checkpoint_dir, log_dir)
    """
    # Create timestamp
    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")

    # Create run directory
    run_dir = os.path.join("runs", f"run_{timestamp}")
    os.makedirs(run_dir, exist_ok=True)

    # Create subdirectories
    checkpoint_dir = os.path.join(run_dir, "checkpoints")
    log_dir = os.path.join(run_dir, "logs")
    os.makedirs(checkpoint_dir, exist_ok=True)
    os.makedirs(log_dir, exist_ok=True)

    # Copy config file to run directory
    config_copy_path = os.path.join(run_dir, "config.yaml")
    shutil.copy(config_path, config_copy_path)

    print(f"Created run directory: {run_dir}")
    print(f"Config saved to: {config_copy_path}")

    return run_dir, checkpoint_dir, log_dir