#!/usr/bin/python3
import ressenger_cryptography, ressenger_exceptions
import pickle, pathlib

class Contact():
    def __init__(self, nickname, b32address, pub_enc, pub_sig):


def load_user(password, username='default'):
    user_path=pathlib.Path(f'~/.ressenger/{username}').expanduser()
    if not user_path.exists():
        raise ressenger_exceptions.UserDoesNotExistError(f'File ~/.ressenger/{username} does not exist.')
    else:
        with open(user_path, 'rb') as file:
            bt=file.read()
        return pickle.loads(ressenger_cryptography.decrypt_bytes(bt, password))

def dump_user(password, user, username='default'):
    user_path=pathlib.Path(f'~/.ressenger/{username}').expanduser()
    if not user_path.exists():
        raise ressenger_exceptions.UserDoesNotExistError(f'File ~/.ressenger/{username} does not exist.')
    else:
        with open(user_path, 'wb') as file:
            file.write(ressenger_cryptography.encrypt_bytes(pickle.dumps(user, protocol=pickle.HIGHEST_PROTOCOL), password))