"""
Path utilities for model and dataset handling
"""
import os
from pathlib import Path
from typing import Optional
import logging

logger = logging.getLogger(__name__)


def normalize_path(path: str) -> str:
    """
    Convert Windows paths to WSL format if needed.

    Examples:
        C:\\Users\\... -> /mnt/c/Users/...
        /home/user/... -> /home/user/... (unchanged)
    """
    if not path:
        return path

    # Handle Windows drive letters (C:\\ or c:\\)
    if len(path) >= 3 and path[1] == ':' and path[2] in ('\\', '/'):
        drive = path[0].lower()
        rest = path[3:].replace('\\', '/')
        return f'/mnt/{drive}/{rest}'

    # Already Unix-style or relative
    return path.replace('\\', '/')
pass

def is_local_path(path: str) -> bool:
    """
    Check if path is a local filesystem path vs HuggingFace model identifier.

    Examples:
        True: /home/user/model, C:\\models, ./model, ~/model
        False: unsloth/llama-3.1-8b, microsoft/phi-2
    """
    if not path:
        return False

    # Obvious HF patterns
    if path.count('/') == 1 and not path.startswith(('/', '.', '~')):
        return False  # Looks like org/model format

    # Filesystem indicators
    return (
        path.startswith(('/', '.', '~')) or  # Unix absolute/relative
        ':' in path or                        # Windows drive or URL
        '\\' in path or                       # Windows separator
        os.path.isabs(path)                  # System-absolute
    )
pass

def get_cache_path(model_name: str) -> Optional[Path]:
    """Get HuggingFace cache path for a model if it exists."""
    cache_dir = Path.home() / '.cache' / 'huggingface' / 'hub'
    model_cache_name = model_name.replace("/", "--")
    model_cache_path = cache_dir / f'models--{model_cache_name}'

    return model_cache_path if model_cache_path.exists() else None
pass

def is_model_cached(model_name: str) -> bool:
    """Check if model is downloaded in HuggingFace cache."""
    cache_path = get_cache_path(model_name)
    if not cache_path:
        return False

    # Check for actual model files
    for suffix in ['.safetensors', '.bin', '.json']:
        if list(cache_path.rglob(f'*{suffix}')):
            return True

    return False
pass