import os
import shutil

def flatten_directory(path):
    """
    Flattens the directory structure by moving files from subdirectories to the parent directory.
    """
    print(f"Flattening files in: {path}")
    if not os.path.isdir(path):
        print(f"Error: Directory not found at {path}")
        return

    # Walk through the directory
    for dirpath, dirnames, filenames in os.walk(path):
        # Don't process the root directory itself in the first iteration
        if dirpath == path:
            continue

        for filename in filenames:
            # Construct full old and new paths
            old_file_path = os.path.join(dirpath, filename)
            new_file_path = os.path.join(path, filename)
            
            # Move the file to the parent directory
            shutil.move(old_file_path, new_file_path)
            print(f"Moved: {old_file_path} -> {new_file_path}")
        
        # After moving all files, if the subdirectory is empty, remove it
        if not os.listdir(dirpath):
            os.rmdir(dirpath)
            print(f"Removed empty directory: {dirpath}")


if __name__ == "__main__":
    flatten_directory('train')
    flatten_directory('test')
    print("File flattening complete.")