1 files changed, 77 insertions, 37 deletions

diff --git a/vk/utils/tracking/db/record.py b/vk/utils/tracking/db/record.py
index 7cb054f..4748a37 100644
--- a/vk/utils/tracking/db/record.py
+++ b/vk/utils/tracking/db/record.py
@@ -3,15 +3,51 @@
 # See LICENSE.txt for details.
 
 from collections import OrderedDict
+from collections.abc import MutableMapping
 from datetime import datetime, timezone
 
-from vk.user import Field as UserField
+from vk.user import LastSeen, User, UserField
 
-def _gen_timestamp():
-    return datetime.now(timezone.utc).replace(microsecond=0)
+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
 
-class Record:
-    _USER_FIELDS = (
+    @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'
+
+    @staticmethod
+    def from_last_seen(ls):
+        return Timestamp(ls.get_time())
+
+    def to_last_seen(self):
+        ls = LastSeen()
+        ls.set_time(self._dt)
+        return ls
+
+class Record(MutableMapping):
+    FIELDS = (
         UserField.UID,
         UserField.FIRST_NAME,
         UserField.LAST_NAME,
@@ -20,48 +56,52 @@ class Record:
         UserField.LAST_SEEN,
     )
 
-    def __init__(self, fields, timestamp=None):
+    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
-        self._timestamp = timestamp if timestamp is not None else _gen_timestamp()
-
-    def __iter__(self):
-        return iter(self._fields)
-
-    def __contains__(self, field):
-        return field in self._fields
 
     def __getitem__(self, field):
+        if field is UserField.LAST_SEEN:
+            return Timestamp.from_last_seen(self._fields[field])
         return self._fields[field]
 
     def __setitem__(self, field, value):
-        self._fields[field] = value
+        if field is UserField.LAST_SEEN:
+            if isinstance(value, str):
+                value = Timestamp.from_string(value).to_last_seen()
+            elif isinstance(value, Timestamp):
+                value = value.to_last_seen()
+            elif isinstance(value, LastSeen):
+                pass
+            else:
+                raise TypeError()
+        self._fields[field] = User.parse(field, value)
 
-    def get_timestamp(self):
-        return self._timestamp
+    def __delitem__(self, field):
+        del self._fields[field]
 
-    @staticmethod
-    def _timestamp_from_string(s):
-        return datetime.fromtimestamp(s)
+    def __iter__(self):
+        return iter(self._fields)
+
+    def __len__(self):
+        return len(self._fields)
 
-    def timestamp_to_string(self):
-        return self.get_timestamp().isoformat()
+    def get_timestamp(self):
+        return self._timestamp
 
     @staticmethod
     def from_user(user):
-        fields = OrderedDict()
-        for field in Record._USER_FIELDS:
-            fields[field] = user[field]
-        if UserField.LAST_SEEN in Record._USER_FIELDS:
-            fields[UserField.LAST_SEEN] = fields[UserField.LAST_SEEN].isoformat()
-        return Record(fields)
+        instance = Record()
+        for field in Record.FIELDS:
+            instance[field] = user[field]
+        return instance
 
-    @staticmethod
-    def from_row(row):
-        timestamp = Record._timestamp_from_string(row[0])
-        fields = OrderedDict()
-        for i in range(len(Record._USER_FIELDS)):
-            fields[Record._USER_FIELDS[i]] = row[i + 1]
-        return Record(fields, timestamp)
-
-    def to_row(self):
-        return [self.timestamp_to_string()] + [self[field] for field in self]
+    def to_user(self):
+        user = User()
+        for field in self:
+            user[field] = self[field]
+        return user