#!/usr/bin/env python

import base64
import json
import os
import argparse


def encode_file_to_base64(file_path, json_path):
    '''
    Reads a file, encodes its content in Base64, and writes it to a JSON file under ['files'][filename].
    '''
    if not os.path.isfile(file_path):
        print(f'Error: File "{file_path}" not found.')
        return

    with open(file_path, 'rb') as f:
        encoded_content = base64.b64encode(f.read()).decode('utf-8')

    filename = os.path.basename(file_path)
    json_data = {}

    # Read existing JSON if the file exists
    if os.path.exists(json_path):
        with open(json_path, 'r', encoding='utf-8') as json_file:
            try:
                json_data = json.load(json_file)
            except json.JSONDecodeError:
                print('Warning: JSON file is empty or invalid. Creating a new structure.')

    # Ensure 'files' key exists
    if 'files' not in json_data:
        json_data['files'] = {}

    # Add Base64 content under filename
    json_data['files'][filename] = encoded_content

    # Write updated data back to JSON file
    with open(json_path, 'w', encoding='utf-8') as json_file:
        json.dump(json_data, json_file, indent=4)

    print(f'Successfully encoded "{filename}" and saved to "{json_path}".')


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Encode a file to Base64 and store it in a JSON file.')
    parser.add_argument('file_path', help='Path to the file to encode.')
    parser.add_argument('json_path', help='Path to the JSON output file.')

    args = parser.parse_args()
    encode_file_to_base64(args.file_path, args.json_path)