#
# Copyright 2015 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 nose_parameterized import parameterized

import pandas as pd
import numpy as np
from mock import patch

from catalyst import TradingAlgorithm
from catalyst.errors import UnsupportedOrderParameters
from catalyst.sources.requests_csv import mask_requests_args
from catalyst.utils import factory
from catalyst.testing import FetcherDataPortal
from catalyst.testing.fixtures import (
    WithResponses,
    WithSimParams,
    CatalystTestCase,
)
from .resources.fetcher_inputs.fetcher_test_data import (
    AAPL_CSV_DATA,
    AAPL_IBM_CSV_DATA,
    AAPL_MINUTE_CSV_DATA,
    CPIAUCSL_DATA,
    FETCHER_ALTERNATE_COLUMN_HEADER,
    FETCHER_UNIVERSE_DATA,
    FETCHER_UNIVERSE_DATA_TICKER_COLUMN,
    MULTI_SIGNAL_CSV_DATA,
    NON_ASSET_FETCHER_UNIVERSE_DATA,
    PALLADIUM_DATA,
    NFLX_DATA
)


class FetcherTestCase(WithResponses,
                      WithSimParams,
                      CatalystTestCase):

    @classmethod
    def make_equity_info(cls):
        return pd.DataFrame.from_dict(
            {
                24: {
                    'start_date': pd.Timestamp('2006-01-01', tz='UTC'),
                    'end_date': pd.Timestamp('2007-01-01', tz='UTC'),
                    'symbol': 'AAPL',
                    'asset_type': 'equity',
                    'exchange': 'nasdaq'
                },
                3766: {
                    'start_date': pd.Timestamp('2006-01-01', tz='UTC'),
                    'end_date': pd.Timestamp('2007-01-01', tz='UTC'),
                    'symbol': 'IBM',
                    'asset_type': 'equity',
                    'exchange': 'nasdaq'
                },
                5061: {
                    'start_date': pd.Timestamp('2006-01-01', tz='UTC'),
                    'end_date': pd.Timestamp('2007-01-01', tz='UTC'),
                    'symbol': 'MSFT',
                    'asset_type': 'equity',
                    'exchange': 'nasdaq'
                },
                14848: {
                    'start_date': pd.Timestamp('2006-01-01', tz='UTC'),
                    'end_date': pd.Timestamp('2007-01-01', tz='UTC'),
                    'symbol': 'YHOO',
                    'asset_type': 'equity',
                    'exchange': 'nasdaq'
                },
                25317: {
                    'start_date': pd.Timestamp('2006-01-01', tz='UTC'),
                    'end_date': pd.Timestamp('2007-01-01', tz='UTC'),
                    'symbol': 'DELL',
                    'asset_type': 'equity',
                    'exchange': 'nasdaq'
                },
                13: {
                    'start_date': pd.Timestamp('2006-01-01', tz='UTC'),
                    'end_date': pd.Timestamp('2010-01-01', tz='UTC'),
                    'symbol': 'NFLX',
                    'asset_type': 'equity',
                    'exchange': 'nasdaq'
                }
            },
            orient='index',
        )

    def run_algo(self, code, sim_params=None, data_frequency="daily"):
        if sim_params is None:
            sim_params = self.sim_params

        test_algo = TradingAlgorithm(
            script=code,
            sim_params=sim_params,
            env=self.env,
            data_frequency=data_frequency
        )

        results = test_algo.run(FetcherDataPortal(self.env,
                                                  self.trading_calendar))

        return results

    def _test_minutely_fetcher(self):
        self.responses.add(
            self.responses.GET,
            'https://fake.urls.com/aapl_minute_csv_data.csv',
            body=AAPL_MINUTE_CSV_DATA,
            content_type='text/csv',
        )

        sim_params = factory.create_simulation_parameters(
            start=pd.Timestamp("2006-01-03", tz='UTC'),
            end=pd.Timestamp("2006-01-10", tz='UTC'),
            emission_rate="minute",
            data_frequency="minute"
        )

        test_algo = TradingAlgorithm(
            script="""
from catalyst.api import fetch_csv, record, sid

def initialize(context):
    fetch_csv('https://fake.urls.com/aapl_minute_csv_data.csv')

def handle_data(context, data):
    record(aapl_signal=data.current(sid(24), "signal"))
""", sim_params=sim_params, data_frequency="minute", env=self.env)

        # manually setting data portal and getting generator because we need
        # the minutely emission packets here.  TradingAlgorithm.run() only
        # returns daily packets.
        test_algo.data_portal = FetcherDataPortal(self.env,
                                                  self.trading_calendar)
        gen = test_algo.get_generator()
        perf_packets = list(gen)

        signal = [result["minute_perf"]["recorded_vars"]["aapl_signal"] for
                  result in perf_packets if "minute_perf" in result]

        self.assertEqual(6 * 390, len(signal))

        # csv data is:
        # symbol,date,signal
        # aapl,1/4/06 5:31AM, 1
        # aapl,1/4/06 11:30AM, 2
        # aapl,1/5/06 5:31AM, 1
        # aapl,1/5/06 11:30AM, 3
        # aapl,1/9/06 5:31AM, 1
        # aapl,1/9/06 11:30AM, 4 for dates 1/3 to 1/10

        # 2 signals per day, only last signal is taken. So we expect
        # 390 bars of signal NaN on 1/3
        # 390 bars of signal 2 on 1/4
        # 390 bars of signal 3 on 1/5
        # 390 bars of signal 3 on 1/6 (forward filled)
        # 390 bars of signal 4 on 1/9
        # 390 bars of signal 4 on 1/9 (forward filled)

        np.testing.assert_array_equal([np.NaN] * 390, signal[0:390])
        np.testing.assert_array_equal([2] * 390, signal[390:780])
        np.testing.assert_array_equal([3] * 780, signal[780:1560])
        np.testing.assert_array_equal([4] * 780, signal[1560:])

    def _test_fetch_csv_with_multi_symbols(self):
        self.responses.add(
            self.responses.GET,
            'https://fake.urls.com/multi_signal_csv_data.csv',
            body=MULTI_SIGNAL_CSV_DATA,
            content_type='text/csv',
        )

        results = self.run_algo(
            """
from catalyst.api import fetch_csv, record, sid

def initialize(context):
    fetch_csv('https://fake.urls.com/multi_signal_csv_data.csv')
    context.stocks = [sid(3766), sid(25317)]

def handle_data(context, data):
    record(ibm_signal=data.current(sid(3766), "signal"))
    record(dell_signal=data.current(sid(25317), "signal"))
    """)

        self.assertEqual(5, results["ibm_signal"].iloc[-1])
        self.assertEqual(5, results["dell_signal"].iloc[-1])

    def _test_fetch_csv_with_pure_signal_file(self):
        self.responses.add(
            self.responses.GET,
            'https://fake.urls.com/cpiaucsl_data.csv',
            body=CPIAUCSL_DATA,
            content_type='text/csv',
        )

        results = self.run_algo(
            """
from catalyst.api import fetch_csv, sid, record

def clean(df):
    return df.rename(columns={'Value':'cpi', 'Date':'date'})

def initialize(context):
    fetch_csv(
        'https://fake.urls.com/cpiaucsl_data.csv',
        symbol='urban',
        pre_func=clean,
        date_format='%Y-%m-%d'
        )
    context.stocks = [sid(3766), sid(25317)]

def handle_data(context, data):

    cur_cpi = data.current("urban", "cpi")
    record(cpi=cur_cpi)
            """)

        self.assertEqual(results["cpi"][-1], 203.1)

    def _test_algo_fetch_csv(self):
        self.responses.add(
            self.responses.GET,
            'https://fake.urls.com/aapl_csv_data.csv',
            body=AAPL_CSV_DATA,
            content_type='text/csv',
        )

        results = self.run_algo(
            """
from catalyst.api import fetch_csv, record, sid

def normalize(df):
    df['scaled'] = df['signal'] * 10
    return df

def initialize(context):
    fetch_csv('https://fake.urls.com/aapl_csv_data.csv',
            post_func=normalize)
    context.checked_name = False

def handle_data(context, data):
    record(
        signal=data.current(sid(24), "signal"),
        scaled=data.current(sid(24), "scaled"),
        price=data.current(sid(24), "price"))
        """)

        self.assertEqual(5, results["signal"][-1])
        self.assertEqual(50, results["scaled"][-1])
        self.assertEqual(24, results["price"][-1])  # fake value

    def _test_algo_fetch_csv_with_extra_symbols(self):
        self.responses.add(
            self.responses.GET,
            'https://fake.urls.com/aapl_ibm_csv_data.csv',
            body=AAPL_IBM_CSV_DATA,
            content_type='text/csv',
        )

        results = self.run_algo(
            """
from catalyst.api import fetch_csv, record, sid

def normalize(df):
    df['scaled'] = df['signal'] * 10
    return df

def initialize(context):
    fetch_csv('https://fake.urls.com/aapl_ibm_csv_data.csv',
            post_func=normalize,
            mask=True)

def handle_data(context, data):
    record(
        signal=data.current(sid(24),"signal"),
        scaled=data.current(sid(24), "scaled"),
        price=data.current(sid(24), "price"))
            """
        )

        self.assertEqual(5, results["signal"][-1])
        self.assertEqual(50, results["scaled"][-1])
        self.assertEqual(24, results["price"][-1])  # fake value

    @parameterized.expand([("unspecified", ""),
                           ("none", "usecols=None"),
                           ("without date", "usecols=['Value']"),
                           ("with date", "usecols=('Value', 'Date')")])
    def _test_usecols(self, testname, usecols):
        self.responses.add(
            self.responses.GET,
            'https://fake.urls.com/cpiaucsl_data.csv',
            body=CPIAUCSL_DATA,
            content_type='text/csv',
        )

        code = """
from catalyst.api import fetch_csv, sid, record

def clean(df):
    return df.rename(columns={{'Value':'cpi'}})

def initialize(context):
    fetch_csv(
        'https://fake.urls.com/cpiaucsl_data.csv',
        symbol='urban',
        pre_func=clean,
        date_column='Date',
        date_format='%Y-%m-%d',{usecols}
        )
    context.stocks = [sid(3766), sid(25317)]

def handle_data(context, data):
    data.current("urban", "cpi")
        """
        results = self.run_algo(code.format(usecols=usecols))
        # 251 trading days in 2006
        self.assertEqual(len(results), 251)

    def _test_sources_merge_custom_ticker(self):
        requests_kwargs = {}

        def capture_kwargs(zelf, url, **kwargs):
            requests_kwargs.update(
                mask_requests_args(url, kwargs).requests_kwargs
            )
            return PALLADIUM_DATA

        # Patching fetch_url instead of using responses in this test so that we
        # can intercept the requests keyword arguments and confirm that they're
        # correct.
        with patch('catalyst.sources.requests_csv.PandasRequestsCSV.fetch_url',
                   new=capture_kwargs):
            results = self.run_algo(
                """
from catalyst.api import fetch_csv, record, sid

def rename_col(df):
    df = df.rename(columns={'New York 15:00': 'price'})
    df = df.fillna(method='ffill')
    return df[['price', 'sid']]

def initialize(context):
    fetch_csv('https://dl.dropbox.com/u/16705795/PALL.csv',
        date_column='Date',
        symbol='palladium',
        post_func=rename_col,
        date_format='%Y-%m-%d'
        )
    context.stock = sid(24)

def handle_data(context, data):
    record(palladium=data.current("palladium", "price"))
    record(aapl=data.current(context.stock, "price"))
        """)

            np.testing.assert_array_equal([24] * 251, results["aapl"])
            self.assertEqual(337, results["palladium"].iloc[-1])

            expected = {
                'allow_redirects': False,
                'stream': True,
                'timeout': 30.0,
            }

            self.assertEqual(expected, requests_kwargs)

    @parameterized.expand([("symbol", FETCHER_UNIVERSE_DATA, None),
                           ("arglebargle", FETCHER_UNIVERSE_DATA_TICKER_COLUMN,
                            FETCHER_ALTERNATE_COLUMN_HEADER)])
    def _test_fetcher_universe(self, name, data, column_name):
        # Patching fetch_url here rather than using responses because (a) it's
        # easier given the paramaterization, and (b) there are enough tests
        # using responses that the fetch_url code is getting a good workout so
        # we don't have to use it in every test.
        with patch('catalyst.sources.requests_csv.PandasRequestsCSV.fetch_url',
                   new=lambda *a, **k: data):
            sim_params = factory.create_simulation_parameters(
                start=pd.Timestamp("2006-01-09", tz='UTC'),
                end=pd.Timestamp("2006-01-11", tz='UTC')
            )

            algocode = """
from pandas import Timestamp
from pandas.tseries.tools import normalize_date
from catalyst.api import fetch_csv, record, sid, get_datetime

def initialize(context):
    fetch_csv(
        'https://dl.dropbox.com/u/16705795/dtoc_history.csv',
        date_format='%m/%d/%Y'{token}
    )
    context.expected_sids = {{
        Timestamp('2006-01-09 00:00:00+0000', tz='UTC'):[24, 3766, 5061],
        Timestamp('2006-01-10 00:00:00+0000', tz='UTC'):[24, 3766, 5061],
        Timestamp('2006-01-11 00:00:00+0000', tz='UTC'):[24, 3766, 5061, 14848]
    }}
    context.bar_count = 0

def handle_data(context, data):
    expected = context.expected_sids[normalize_date(get_datetime())]
    actual = data.fetcher_assets
    for stk in expected:
        if stk not in actual:
            raise Exception(
                "{{stk}} is missing on dt={{dt}}".format(
                    stk=stk, dt=get_datetime()))

    record(sid_count=len(actual))
    record(bar_count=context.bar_count)
    context.bar_count += 1
            """
            replacement = ""
            if column_name:
                replacement = ",symbol_column='%s'\n" % column_name
            real_algocode = algocode.format(token=replacement)

            results = self.run_algo(real_algocode, sim_params=sim_params)

            self.assertEqual(len(results), 3)
            self.assertEqual(3, results["sid_count"].iloc[0])
            self.assertEqual(3, results["sid_count"].iloc[1])
            self.assertEqual(4, results["sid_count"].iloc[2])

    def _test_fetcher_universe_non_security_return(self):
        self.responses.add(
            self.responses.GET,
            'https://fake.urls.com/bad_fetcher_universe_data.csv',
            body=NON_ASSET_FETCHER_UNIVERSE_DATA,
            content_type='text/csv',
        )

        sim_params = factory.create_simulation_parameters(
            start=pd.Timestamp("2006-01-09", tz='UTC'),
            end=pd.Timestamp("2006-01-10", tz='UTC')
        )

        self.run_algo(
            """
from catalyst.api import fetch_csv

def initialize(context):
    fetch_csv(
        'https://fake.urls.com/bad_fetcher_universe_data.csv',
        date_format='%m/%d/%Y'
    )

def handle_data(context, data):
    if len(data.fetcher_assets) > 0:
        raise Exception("Shouldn't be any assets in fetcher_assets!")
            """,
            sim_params=sim_params,
        )

    def test_order_against_data(self):
        self.responses.add(
            self.responses.GET,
            'https://fake.urls.com/palladium_data.csv',
            body=PALLADIUM_DATA,
            content_type='text/csv',
        )

        with self.assertRaises(UnsupportedOrderParameters):
            self.run_algo("""
from catalyst.api import fetch_csv, order, sid

def rename_col(df):
    return df.rename(columns={'New York 15:00': 'price'})

def initialize(context):
    fetch_csv('https://fake.urls.com/palladium_data.csv',
        date_column='Date',
        symbol='palladium',
        post_func=rename_col,
        date_format='%Y-%m-%d'
        )
    context.stock = sid(24)

def handle_data(context, data):
    order('palladium', 100)
            """)

    def _test_fetcher_universe_minute(self):
        self.responses.add(
            self.responses.GET,
            'https://fake.urls.com/fetcher_universe_data.csv',
            body=FETCHER_UNIVERSE_DATA,
            content_type='text/csv',
        )

        sim_params = factory.create_simulation_parameters(
            start=pd.Timestamp("2006-01-09", tz='UTC'),
            end=pd.Timestamp("2006-01-11", tz='UTC'),
            data_frequency="minute"
        )

        results = self.run_algo(
            """
from pandas import Timestamp
from catalyst.api import fetch_csv, record, get_datetime

def initialize(context):
    fetch_csv(
        'https://fake.urls.com/fetcher_universe_data.csv',
        date_format='%m/%d/%Y'
    )
    context.expected_sids = {
        Timestamp('2006-01-09 00:00:00+0000', tz='UTC'):[24, 3766, 5061],
        Timestamp('2006-01-10 00:00:00+0000', tz='UTC'):[24, 3766, 5061],
        Timestamp('2006-01-11 00:00:00+0000', tz='UTC'):[24, 3766, 5061, 14848]
    }
    context.bar_count = 0

def handle_data(context, data):
    expected = context.expected_sids[get_datetime().replace(hour=0, minute=0)]
    actual = data.fetcher_assets
    for stk in expected:
        if stk not in actual:
            raise Exception("{stk} is missing".format(stk=stk))

    record(sid_count=len(actual))
    record(bar_count=context.bar_count)
    context.bar_count += 1
        """, sim_params=sim_params, data_frequency="minute"
        )

        self.assertEqual(3, len(results))
        self.assertEqual(3, results["sid_count"].iloc[0])
        self.assertEqual(3, results["sid_count"].iloc[1])
        self.assertEqual(4, results["sid_count"].iloc[2])

    def _test_fetcher_in_before_trading_start(self):
        self.responses.add(
            self.responses.GET,
            'https://fake.urls.com/fetcher_nflx_data.csv',
            body=NFLX_DATA,
            content_type='text/csv',
        )

        sim_params = factory.create_simulation_parameters(
            start=pd.Timestamp("2013-06-13", tz='UTC'),
            end=pd.Timestamp("2013-11-15", tz='UTC'),
            data_frequency="minute"
        )

        results = self.run_algo("""
from catalyst.api import fetch_csv, record, symbol

def initialize(context):
    fetch_csv('https://fake.urls.com/fetcher_nflx_data.csv',
               date_column = 'Settlement Date',
               date_format = '%m/%d/%y')
    context.stock = symbol('NFLX')

def before_trading_start(context, data):
    record(Short_Interest = data.current(context.stock, 'dtc'))
""", sim_params=sim_params, data_frequency="minute")

        values = results["Short_Interest"]
        np.testing.assert_array_equal(values[0:33], np.full(33, np.nan))
        np.testing.assert_array_almost_equal(values[33:44], [1.690317] * 11)
        np.testing.assert_array_almost_equal(values[44:55], [2.811858] * 11)
        np.testing.assert_array_almost_equal(values[55:64], [2.50233] * 9)
        np.testing.assert_array_almost_equal(values[64:75], [2.550829] * 11)
        np.testing.assert_array_almost_equal(values[75:], [2.64484] * 35)

    def _test_fetcher_bad_data(self):
        self.responses.add(
            self.responses.GET,
            'https://fake.urls.com/fetcher_nflx_data.csv',
            body=NFLX_DATA,
            content_type='text/csv',
        )

        sim_params = factory.create_simulation_parameters(
            start=pd.Timestamp("2013-06-12", tz='UTC'),
            end=pd.Timestamp("2013-06-14", tz='UTC'),
            data_frequency="minute"
        )

        results = self.run_algo("""
from catalyst.api import fetch_csv, symbol
import numpy as np

def initialize(context):
    fetch_csv('https://fake.urls.com/fetcher_nflx_data.csv',
               date_column = 'Settlement Date',
               date_format = '%m/%d/%y')
    context.nflx = symbol('NFLX')
    context.aapl = symbol('AAPL')

def handle_data(context, data):
    assert np.isnan(data.current(context.nflx, 'invalid_column'))
    assert np.isnan(data.current(context.aapl, 'invalid_column'))
    assert np.isnan(data.current(context.aapl, 'dtc'))
""", sim_params=sim_params, data_frequency="minute")

        self.assertEqual(3, len(results))
