main.py

import chardet
from json import loads, dumps


def detect_file_encoding(file_path):
    """ Detects the encoding of a file """
    with open(file_path, 'rb') as file:
        raw_data = file.read()
        result = chardet.detect(raw_data)
        return result['encoding']


def read_fyt_file(file_path, encoding):
    with open(file_path, 'rb') as file:
        bytes = file.read()
        initial_bytes = bytes[0: 26]
        final_byte = bytes[-1:]
        data = bytes[26:-1]
        decoded_json = loads(data.decode(encoding))
        return decoded_json, initial_bytes, final_byte


def write_fyt_file(file_path, encoding, data, initial_bytes, final_byte):
    with open(file_path, 'wb') as file:
        file.write(initial_bytes)
        json_data = dumps(data, indent=2)
        json_data = json_data.replace('\n', '\r\n')
        file.write(json_data.encode(encoding))
        file.write(final_byte)


# Example usage
#encoding = detect_file_encoding('temp_v2.fyt')
encoding = 'Windows-1252'
print(encoding)
data, initial_bytes, final_byte = read_fyt_file('temp_v2.fyt', encoding)

for part in data['sections'][0]['parts']:
    if part['group-name'] == 'Humidity':
        part['phases'][0]['value'] = 50


write_fyt_file('temp2b.fyt', encoding, data, initial_bytes, final_byte)
pass