# Copyright 2016 Egor Tensin <Egor.Tensin@gmail.com>
# This file is licensed under the terms of the MIT License.
# See LICENSE.txt for details.
from collections import OrderedDict
from collections.abc import MutableMapping
from datetime import datetime, timezone
from vk.user import LastSeen, LastSeenField, User, UserField
class Timestamp:
@staticmethod
def _new():
return datetime.utcnow()
@staticmethod
def _is_timezone_aware(dt):
return dt.tzinfo is not None and dt.tzinfo.utcoffset(dt) is not None
@staticmethod
def _lose_timezone(dt):
if Timestamp._is_timezone_aware(dt):
return dt.astimezone(timezone.utc).replace(tzinfo=None)
return dt
def __init__(self, dt=None):
if dt is None:
dt = self._new()
dt = dt.replace(microsecond=0)
dt = self._lose_timezone(dt)
self.dt = dt
@staticmethod
def from_string(s):
return Timestamp(datetime.strptime(s, '%Y-%m-%dT%H:%M:%SZ'))
def __str__(self):
return self.dt.isoformat() + 'Z'
class Record(MutableMapping):
FIELDS = (
UserField.UID,
UserField.FIRST_NAME,
UserField.LAST_NAME,
UserField.SCREEN_NAME,
UserField.ONLINE,
LastSeenField.TIME,
LastSeenField.PLATFORM,
)
def __init__(self, timestamp=None, fields=None):
if timestamp is None:
timestamp = Timestamp()
if fields is None:
fields = OrderedDict()
self._timestamp = timestamp
self._fields = fields
def __getitem__(self, field):
if field is LastSeenField.TIME:
return Timestamp(self._fields[field])
return self._fields[field]
def __setitem__(self, field, value):
if field is LastSeenField.TIME:
if isinstance(value, str):
value = Timestamp.from_string(value).dt
elif isinstance(value, Timestamp):
value = value.dt
elif isinstance(value, datetime):
pass
else:
raise TypeError()
if isinstance(field, LastSeenField):
self._fields[field] = LastSeen.parse(field, value)
elif isinstance(field, UserField):
self._fields[field] = User.parse(field, value)
else:
raise TypeError()
def __delitem__(self, field):
del self._fields[field]
def __iter__(self):
return iter(self._fields)
def __len__(self):
return len(self._fields)
def get_timestamp(self):
return self._timestamp
@staticmethod
def from_user(user):
record = Record()
for field in Record.FIELDS:
if isinstance(field, UserField):
record[field] = user[field]
elif isinstance(field, LastSeenField):
record[field] = user.get_last_seen()[field]
else:
assert False
return record
def to_user(self):
user = User()
last_seen = LastSeen()
for field in self:
if isinstance(field, LastSeenField):
last_seen[field] = self[field]
elif isinstance(field, UserField):
user[field] = self[field]
else:
assert False
if len(last_seen):
user.set_last_seen(last_seen)
return user
