# QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
# Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
#
# 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 AlgorithmImports import *

### <summary>
### This algorithm demonstrates using the history provider to retrieve data
### to warm up indicators before data is received.
### </summary>
### <meta name="tag" content="indicators" />
### <meta name="tag" content="history" />
### <meta name="tag" content="history and warm up" />
### <meta name="tag" content="using data" />
class WarmupHistoryAlgorithm(QCAlgorithm):

 def initialize(self):
 '''Initialise the data and resolution required, as well as the cash and start-end dates for your algorithm. All algorithms must initialized.'''

 self.set_start_date(2014,5,2) #Set Start Date
 self.set_end_date(2014,5,2) #Set End Date
 self.set_cash(100000) #Set Strategy Cash
 # Find more symbols here: http://quantconnect.com/data
 forex = self.add_forex("EURUSD", Resolution.SECOND)
 forex = self.add_forex("NZDUSD", Resolution.SECOND)

 fast_period = 60
 slow_period = 3600
 self.fast = self.ema("EURUSD", fast_period)
 self.slow = self.ema("EURUSD", slow_period)

 # "slow_period + 1" because rolling window waits for one to fall off the back to be considered ready
 # History method returns a dict with a pandas.data_frame
 history = self.history(["EURUSD", "NZDUSD"], slow_period + 1)

 # prints out the tail of the dataframe
 self.log(str(history.loc["EURUSD"].tail()))
 self.log(str(history.loc["NZDUSD"].tail()))

 for index, row in history.loc["EURUSD"].iterrows():
 self.fast.update(index, row["close"])
 self.slow.update(index, row["close"])

 self.log("FAST {0} READY. Samples: {1}".format("IS" if self.fast.is_ready else "IS NOT", self.fast.samples))
 self.log("SLOW {0} READY. Samples: {1}".format("IS" if self.slow.is_ready else "IS NOT", self.slow.samples))


 def on_data(self, data):
 '''OnData event is the primary entry point for your algorithm. Each new data point will be pumped in here.'''

 if self.fast.current.value > self.slow.current.value:
 self.set_holdings("EURUSD", 1)
 else:
 self.set_holdings("EURUSD", -1)