import re
import sys

def add_console_log_to_js(js_file_path):
    with open(js_file_path, 'r') as file:
        lines = file.readlines()
    
    return_pattern = re.compile(r'\s*return\s+(.*);')
    
    modified_lines = []
    for i, line in enumerate(lines):
        match = return_pattern.search(line)
        if match:
            return_expression = match.group(1)
            indentation = len(line) - len(line.lstrip())
            log_statement = f'{" " * indentation}console.log("Returning from function at line {i + 1}: ", {return_expression});\n'
            modified_lines.append(log_statement)
        modified_lines.append(line)
    
    with open(js_file_path, 'w') as file:
        file.writelines(modified_lines)

if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("Usage: python prepare_script.py <path_to_js_file>")
        sys.exit(1)
    
    js_file_path = sys.argv[1]
    add_console_log_to_js(js_file_path)