import os
import shutil
from pathlib import Path
import sys
import argparse

def sync_files(src_path: str, dest_path: str) -> None:
    """
    Synchronize files from source to destination directory, skipping existing files.
    
    Args:
        src_path: Source directory path
        dest_path: Destination directory path
    """
    # Convert to Path objects for easier handling
    src = Path(src_path)
    dest = Path(dest_path)
    
    # Ensure source directory exists
    if not src.exists():
        raise FileNotFoundError(f"Source directory {src_path} does not exist")
    
    # Create destination directory if it doesn't exist
    dest.mkdir(parents=True, exist_ok=True)
    
    # Walk through source directory
    for root, _, files in os.walk(src):
        # Convert current root to Path object
        root_path = Path(root)
        
        # Calculate relative path from source
        rel_path = root_path.relative_to(src)
        
        # Create corresponding destination directory
        dest_dir = dest / rel_path
        dest_dir.mkdir(parents=True, exist_ok=True)
        
        # Copy each file
        for file in files:
            src_file = root_path / file
            dest_file = dest_dir / file
            
            # Skip if destination file exists
            if dest_file.exists():
                print(f"Skipping existing file: {dest_file}")
                continue
            
            # Copy the file
            print(f"Copying: {src_file} -> {dest_file}")
            shutil.copy2(src_file, dest_file)

# Usage
# python sync.py "C:\Users\petr\OneDrive\Photos\Auto-saved\2024\11" "D:\Photos\OneDrive-Photo\2024\11"
# python sync.py /path/to/source /path/to/destination
if __name__ == "__main__":
    # Set up argument parser
    parser = argparse.ArgumentParser(description='Synchronize files from source to destination directory')
    parser.add_argument('src', help='Source directory path')
    parser.add_argument('dest', help='Destination directory path')
    
    # Parse arguments
    args = parser.parse_args()
    
    try:
        sync_files(args.src, args.dest)
    except Exception as e:
        print(f"Error: {e}", file=sys.stderr)
        sys.exit(1)