import argparse
import json
from pathlib import Path

def indent_json_file(input_file, output_file=None, indent=4):
    # Read the JSON file
    with open(input_file, 'r') as file:
        data = json.load(file)

    # Determine the output file path
    if output_file is None:
        output_file = input_file.with_stem(input_file.stem + '_indented' + input_file.suffix)

    # Write the indented JSON to the output file
    with open(output_file, 'w') as file:
        json.dump(data, file, indent=indent)

def main():
    parser = argparse.ArgumentParser(description='Indent a JSON file and save it to a new file.')
    parser.add_argument('input_file', type=Path, help='path to the input JSON file')
    parser.add_argument('-o', '--output_file', type=Path, help='path to the output JSON file')
    parser.add_argument('--indent', type=int, default=4, help='number of spaces for indentation (default: 4)')

    args = parser.parse_args()

    input_file = args.input_file
    output_file = args.output_file
    indent = args.indent

    indent_json_file(input_file, output_file, indent)

if __name__ == '__main__':
    main()