#!/usr/bin/env python3
"""
Path utility functions for PunimTag
Ensures all paths are stored as absolute paths for consistency
"""

import os
from pathlib import Path
from typing import Union


def normalize_path(path: Union[str, Path]) -> str:
    """
    Convert any path to an absolute path.
    
    Args:
        path: Path to normalize (can be relative or absolute)
        
    Returns:
        Absolute path as string
        
    Examples:
        normalize_path("demo_photos") -> "/home/user/punimtag/demo_photos"
        normalize_path("./photos") -> "/home/user/punimtag/photos"
        normalize_path("/absolute/path") -> "/absolute/path"
    """
    if not path:
        raise ValueError("Path cannot be empty or None")
    
    # Convert to string if Path object
    path_str = str(path)
    
    # Use pathlib for robust path resolution
    normalized = Path(path_str).resolve()
    
    return str(normalized)


def is_absolute_path(path: Union[str, Path]) -> bool:
    """
    Check if a path is absolute.
    
    Args:
        path: Path to check
        
    Returns:
        True if path is absolute, False if relative
    """
    return Path(path).is_absolute()


def is_relative_path(path: Union[str, Path]) -> bool:
    """
    Check if a path is relative.
    
    Args:
        path: Path to check
        
    Returns:
        True if path is relative, False if absolute
    """
    return not Path(path).is_absolute()


def validate_path_exists(path: Union[str, Path]) -> bool:
    """
    Check if a path exists and is accessible.
    
    Args:
        path: Path to validate
        
    Returns:
        True if path exists and is accessible, False otherwise
    """
    try:
        normalized = normalize_path(path)
        return os.path.exists(normalized) and os.access(normalized, os.R_OK)
    except (ValueError, OSError):
        return False


def get_path_info(path: Union[str, Path]) -> dict:
    """
    Get detailed information about a path.
    
    Args:
        path: Path to analyze
        
    Returns:
        Dictionary with path information
    """
    try:
        normalized = normalize_path(path)
        path_obj = Path(normalized)
        
        return {
            'original': str(path),
            'normalized': normalized,
            'is_absolute': path_obj.is_absolute(),
            'is_relative': not path_obj.is_absolute(),
            'exists': path_obj.exists(),
            'is_file': path_obj.is_file(),
            'is_dir': path_obj.is_dir(),
            'parent': str(path_obj.parent),
            'name': path_obj.name,
            'stem': path_obj.stem,
            'suffix': path_obj.suffix
        }
    except Exception as e:
        return {
            'original': str(path),
            'error': str(e)
        }


def ensure_directory_exists(path: Union[str, Path]) -> str:
    """
    Ensure a directory exists, creating it if necessary.
    
    Args:
        path: Directory path to ensure exists
        
    Returns:
        Absolute path to the directory
    """
    normalized = normalize_path(path)
    Path(normalized).mkdir(parents=True, exist_ok=True)
    return normalized


def get_relative_path_from_base(absolute_path: Union[str, Path], base_path: Union[str, Path]) -> str:
    """
    Get relative path from a base directory.
    
    Args:
        absolute_path: Absolute path to convert
        base_path: Base directory to make relative to
        
    Returns:
        Relative path from base directory
    """
    abs_path = normalize_path(absolute_path)
    base = normalize_path(base_path)
    
    try:
        return str(Path(abs_path).relative_to(base))
    except ValueError:
        # If paths don't share a common base, return the absolute path
        return abs_path


# Test the utility functions
if __name__ == "__main__":
    print("=== Path Utility Functions Test ===")
    
    test_paths = [
        "demo_photos",
        "./demo_photos",
        "../demo_photos", 
        "/home/ladmin/Code/punimtag/demo_photos",
        "C:/Users/Test/Photos",
        "/tmp/test"
    ]
    
    for path in test_paths:
        print(f"\nTesting: {path}")
        try:
            normalized = normalize_path(path)
            info = get_path_info(path)
            print(f"  Normalized: {normalized}")
            print(f"  Exists: {info['exists']}")
            print(f"  Is directory: {info['is_dir']}")
        except Exception as e:
            print(f"  Error: {e}")