# Copyright 2016 Mycroft AI, Inc.
#
# This file is part of Mycroft Core.
#
# Mycroft Core 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.
#
# Mycroft Core 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 Mycroft Core.  If not, see <http://www.gnu.org/licenses/>.


import json
import time

from mycroft.filesystem import FileSystemAccess


class DeviceIdentity(object):
    def __init__(self, **kwargs):
        self.uuid = kwargs.get("uuid", "")
        self.access = kwargs.get("access", "")
        self.refresh = kwargs.get("refresh", "")
        self.expires_at = kwargs.get("expires_at", 0)

    def is_expired(self):
        return self.refresh and self.expires_at <= time.time()


class IdentityManager(object):
    __identity = None

    @staticmethod
    def load():
        try:
            with FileSystemAccess('identity').open('identity2.json', 'r') as f:
                IdentityManager.__identity = DeviceIdentity(**json.load(f))
        except:
            IdentityManager.__identity = DeviceIdentity()
        return IdentityManager.__identity

    @staticmethod
    def save(login=None):
        if login:
            IdentityManager.update(login)
        with FileSystemAccess('identity').open('identity2.json', 'w') as f:
            json.dump(IdentityManager.__identity.__dict__, f)

    @staticmethod
    def update(login={}):
        expiration = login.get("expiration", 0)
        IdentityManager.__identity.uuid = login.get("uuid", "")
        IdentityManager.__identity.access = login.get("accessToken", "")
        IdentityManager.__identity.refresh = login.get("refreshToken", "")
        IdentityManager.__identity.expires_at = time.time() + expiration

    @staticmethod
    def get():
        if not IdentityManager.__identity:
            IdentityManager.load()
        return IdentityManager.__identity