# -*- coding: utf-8 -*-
 
# Copyright (c) 2018  Michael Rasmussen <mir@datanom.net>
 
# This file is part of SecureMail.

# SecureMail is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# SecureMail is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with SecureMail.  If not, see <https://www.gnu.org/licenses/>.

try:
    import cPickle as pickle
except:
    import pickle
from db import DBInterface as DBI
from cryptonize import Cryptonize

class NoSuchUserException(Exception):
    pass

class User:
    """
    Class implementing the backend users
    """
    def __init__(self, key=None):
        if key is not None:
            self.load(key)

    def store(self, key):
        crypto = Cryptonize()
        cipher = crypto.symmetric_encrypt(key, pickle.dumps(self.__dict__))
        DBI.store_user(crypto.generate_hash(key), cipher)

    def load(self, key):
        crypto = Cryptonize()
        cipher = DBI.load_user(crypto.generate_hash(key))
        if cipher is None:
            raise NoSuchUserException('{0}: User not found'.format(key))
        plain = crypto.symmetric_decrypt(key, cipher)
        try:
            obj = pickle.loads(plain)
            self.__dict__.update(obj)
        except pickle.UnpicklingError as e:
            raise NoSuchUserException(e)
            
    @property
    def name(self):
        return self._name

    @name.setter
    def name(self, name):
        self._name = name

    @property
    def email(self):
        return self.email

    @email.setter
    def email(self, email):
        self._email = email


if __name__ == '__main__':
    try:
        u = User('test')
        for attr, value in u.__dict__.items():
            print ('{0}: {1}'.format(attr, value))
        c = Cryptonize()
        key = 'æselØre' #c.get_random_key()
        cipher = c.symmetric_encrypt(key, pickle.dumps(u))
        obj = pickle.loads(c.symmetric_decrypt(key, cipher))
        for attr, value in obj.__dict__.items():
            print ('{0}: {1}'.format(attr, value))
    except NoSuchUserException:
        u = User()
        u.name = 'testname'
        u.email = 'testname@securemail.icu'
        u.store('test')
    except Exception as e:
        print (e)