#
# Copyright 2013 Quantopian, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from collections import defaultdict
import datetime

from utils.protocol_utils import Enum

# Datasource type should completely determine the other fields of a
# message with its type.
DATASOURCE_TYPE = Enum(
    'AS_TRADED_EQUITY',
    'MERGER',
    'SPLIT',
    'DIVIDEND',
    'TRADE',
    'TRANSACTION',
    'ORDER',
    'EMPTY',
    'DONE',
    'CUSTOM',
    'BENCHMARK'
)


class Event(object):

    def __init__(self, initial_values=None):
        if initial_values:
            self.__dict__ = initial_values

    def __getitem__(self, name):
        return getattr(self, name)

    def __setitem__(self, name, value):
        setattr(self, name, value)

    def __delitem__(self, name):
        delattr(self, name)

    def keys(self):
        return self.__dict__.keys()

    def __eq__(self, other):
        return self.__dict__ == other.__dict__

    def __contains__(self, name):
        return name in self.__dict__

    def __repr__(self):
        return "Event({0})".format(self.__dict__)


class Order(Event):
    pass


class Portfolio(object):

    def __init__(self, initial_values=None):
        if initial_values:
            self.__dict__ = initial_values

    def __getitem__(self, key):
        return self.__dict__[key]

    def __repr__(self):
        return "Portfolio({0})".format(self.__dict__)


class Position(object):

    def __init__(self, sid):
        self.sid = sid
        self.amount = 0
        self.cost_basis = 0.0  # per share
        self.last_sale_price = 0.0

    def __getitem__(self, key):
        return self.__dict__[key]

    def __repr__(self):
        return "Position({0})".format(self.__dict__)


class Positions(dict):

    def __missing__(self, key):
        pos = Position(key)
        self[key] = pos
        return pos


class SIDData(object):

    def __init__(self, initial_values=None):
        if initial_values:
            self.__dict__ = initial_values

    def __getitem__(self, name):
        return self.__dict__[name]

    def __setitem__(self, name, value):
        self.__dict__[name] = value

    def __len__(self):
        return len(self.__dict__)

    def __contains__(self, name):
        return name in self.__dict__

    def __repr__(self):
        return "SIDData({0})".format(self.__dict__)


class BarData(object):
    """
    Holds the event data for all sids for a given dt.

    This is what is passed as `data` to the `handle_data` function.

    Note: Many methods are analogues of dictionary because of historical
    usage of what this replaced as a dictionary subclass.
    """

    def __init__(self):
        self._data = defaultdict(SIDData)
        self._contains_override = None

    def __contains__(self, name):
        if self._contains_override:
            return self._contains_override(name)
        else:
            return name in self.__dict__

    def __setitem__(self, name, value):
        self._data[name] = value

    def __getitem__(self, name):
        return self._data[name]

    def __delitem__(self, name):
        del self._data[name]

    def __iter__(self):
        return self._data.iterkeys()

    def keys(self):
        return self._data.keys()

    def iterkeys(self):
        return self._data.iterkeys()

    def itervalues(self):
        return self._data.itervalues()

    def iteritems(self):
        return self._data.iteritems()

    def items(self):
        return self._data.items()


class DailyReturn(object):

    def __init__(self, date, returns):

        assert isinstance(date, datetime.datetime)
        self.date = date.replace(hour=0, minute=0, second=0, microsecond=0)
        self.returns = returns

    def to_dict(self):
        return {
            'dt': self.date,
            'returns': self.returns
        }

    def __repr__(self):
        return str(self.date) + " - " + str(self.returns)