1 files changed, 88 insertions, 0 deletions
diff --git a/vk/utils/tracking/online_streaks.py b/vk/utils/tracking/online_streaks.py
new file mode 100644
index 0000000..7523750
--- /dev/null
+++ b/vk/utils/tracking/online_streaks.py
@@ -0,0 +1,88 @@
+# 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 timedelta
+
+from vk.user import User
+
+class OnlineStreakEnumerator(MutableMapping):
+    def __init__(self):
+        self._records = {}
+
+    def __getitem__(self, user):
+        return self._records[user]
+
+    def __setitem__(self, user, record):
+        self._records[user] = record
+
+    def __delitem__(self, user):
+        del self._records[user]
+
+    def __iter__(self):
+        return iter(self._records)
+
+    def __len__(self):
+        return len(self._records)
+
+    def enum(self, db_reader):
+        for record in db_reader:
+            period = self._insert_record(record)
+            if period is not None:
+                yield period
+
+    def group_by_user(self, db_reader):
+        by_user = {}
+        for user, time_from, time_to in self.enum(db_reader):
+            if user not in by_user:
+                by_user[user] = timedelta()
+            by_user[user] += time_to - time_from
+        return by_user
+
+    def group_by_date(self, db_reader):
+        by_date = OrderedDict()
+        for _, time_from, time_to in self.enum(db_reader):
+            for date, duration in self._enum_dates_and_durations(time_from, time_to):
+                if date not in by_date:
+                    by_date[date] = timedelta()
+                by_date[date] += duration
+        return by_date
+
+    def group_by_weekday(self, db_reader):
+        by_weekday = OrderedDict()
+        for weekday in range(7):
+            by_weekday[weekday] = timedelta()
+        for _, time_from, time_to in self.enum(db_reader):
+            for date, duration in self._enum_dates_and_durations(time_from, time_to):
+                by_weekday[date.weekday()] += duration
+        return by_weekday
+
+    @staticmethod
+    def _enum_dates_and_durations(time_from, time_to):
+        while time_from.date() != time_to.date():
+            next_day = time_from.date() + timedelta(days=1)
+            yield time_from.date(), next_day - time_from
+            time_from = next_day
+        yield time_to.date(), time_to - time_from
+
+    def _insert_record(self, record):
+        return self._insert_user(record.to_user())
+
+    def _known_user(self, user):
+        return user.get_uid() in self._records
+
+    def _unknown_user(self, user):
+        return not self._known_user(user)
+
+    def _insert_user(self, user):
+        if user not in self or self[user].is_offline():
+            self[user] = user
+            return None
+        if user.is_online():
+            print(user._fields)
+            return None
+        period = user, self[user].get_last_seen_time(), user.get_last_seen_time()
+        self[user] = user
+        return period