#!/usr/bin/env python
# -*- coding: utf-8; py-indent-offset:4 -*-
###############################################################################
#
# Copyright (C) 2015-2020 Daniel Rodriguez
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
###############################################################################
from __future__ import (absolute_import, division, print_function,
                        unicode_literals)


import argparse
import datetime

import backtrader as bt


class St(bt.Strategy):
    params = dict(
        ma=bt.ind.SMA,
        p1=5,
        p2=15,
        limit=0.005,
        limdays=3,
        limdays2=1000,
        hold=10,
        usetarget=False,  # use order_target_size
        switchp1p2=False,  # switch prices of order1 and order2
        oco1oco2=False,  # False - use order1 as oco for order3, else order2
        do_oco=True,  # use oco or not
    )

    def notify_order(self, order):
        print('{}: Order ref: {} / Type {} / Status {}'.format(
            self.data.datetime.date(0),
            order.ref, 'Buy' * order.isbuy() or 'Sell',
            order.getstatusname()))

        if order.status == order.Completed:
            self.holdstart = len(self)

        if not order.alive() and order.ref in self.orefs:
            self.orefs.remove(order.ref)

    def __init__(self):
        ma1, ma2 = self.p.ma(period=self.p.p1), self.p.ma(period=self.p.p2)
        self.cross = bt.ind.CrossOver(ma1, ma2)

        self.orefs = list()

        if self.p.usetarget:
            print('-' * 5, 'Using order_target_size')
            self._dobuy = self.order_target_size
            self._doclose = self.order_target_size
        else:
            self._dobuy = self.buy
            self._doclose = self.close

    def next(self):
        if self.orefs:
            return  # pending orders do nothing

        if not self.position:
            if self.cross > 0.0:  # crossing up

                p1 = self.data.close[0] * (1.0 - self.p.limit)
                p2 = self.data.close[0] * (1.0 - 2 * 2 * self.p.limit)
                p3 = self.data.close[0] * (1.0 - 3 * 3 * self.p.limit)

                valid1 = datetime.timedelta(self.p.limdays)
                valid2 = valid3 = datetime.timedelta(self.p.limdays2)

                if self.p.switchp1p2:
                    p1, p2 = p2, p1
                    valid1, valid2 = valid2, valid1

                print('valid1 is:', valid1)

                kargs = dict(exectype=bt.Order.Limit)
                kargs[('target' * self.p.usetarget) or 'size'] = 1

                o1 = self._dobuy(price=p1, valid=valid1, **kargs)
                print('{}: Oref {} / Buy at {}'.format(
                    self.datetime.date(), o1.ref, p1))

                oco2 = o1 if self.p.do_oco else None
                o2 = self._dobuy(price=p2, valid=valid2, oco=oco2, **kargs)

                print('{}: Oref {} / Buy at {}'.format(
                    self.datetime.date(), o2.ref, p2))

                if self.p.do_oco:
                    oco3 = o1 if not self.p.oco1oco2 else oco2
                else:
                    oco3 = None

                o3 = self._dobuy(price=p3, valid=valid3, oco=oco3, **kargs)

                print('{}: Oref {} / Buy at {}'.format(
                    self.datetime.date(), o3.ref, p3))

                self.orefs = [o1.ref, o2.ref, o3.ref]

        else:  # in the market
            if (len(self) - self.holdstart) >= self.p.hold:
                self._doclose()


def runstrat(args=None):
    args = parse_args(args)

    cerebro = bt.Cerebro()

    # Data feed kwargs
    kwargs = dict()

    # Parse from/to-date
    dtfmt, tmfmt = '%Y-%m-%d', 'T%H:%M:%S'
    for a, d in ((getattr(args, x), x) for x in ['fromdate', 'todate']):
        if a:
            strpfmt = dtfmt + tmfmt * ('T' in a)
            kwargs[d] = datetime.datetime.strptime(a, strpfmt)

    # Data feed
    data0 = bt.feeds.BacktraderCSVData(dataname=args.data0, **kwargs)
    cerebro.adddata(data0)

    # Broker
    cerebro.broker = bt.brokers.BackBroker(**eval('dict(' + args.broker + ')'))

    # Sizer
    cerebro.addsizer(bt.sizers.FixedSize, **eval('dict(' + args.sizer + ')'))

    # Strategy
    cerebro.addstrategy(St, **eval('dict(' + args.strat + ')'))

    # Execute
    cerebro.run(**eval('dict(' + args.cerebro + ')'))

    if args.plot:  # Plot if requested to
        cerebro.plot(**eval('dict(' + args.plot + ')'))


def parse_args(pargs=None):
    parser = argparse.ArgumentParser(
        formatter_class=argparse.ArgumentDefaultsHelpFormatter,
        description=(
            'Sample Skeleton'
        )
    )

    parser.add_argument('--data0', default='../../datas/2005-2006-day-001.txt',
                        required=False, help='Data to read in')

    # Defaults for dates
    parser.add_argument('--fromdate', required=False, default='',
                        help='Date[time] in YYYY-MM-DD[THH:MM:SS] format')

    parser.add_argument('--todate', required=False, default='',
                        help='Date[time] in YYYY-MM-DD[THH:MM:SS] format')

    parser.add_argument('--cerebro', required=False, default='',
                        metavar='kwargs', help='kwargs in key=value format')

    parser.add_argument('--broker', required=False, default='',
                        metavar='kwargs', help='kwargs in key=value format')

    parser.add_argument('--sizer', required=False, default='',
                        metavar='kwargs', help='kwargs in key=value format')

    parser.add_argument('--strat', required=False, default='',
                        metavar='kwargs', help='kwargs in key=value format')

    parser.add_argument('--plot', required=False, default='',
                        nargs='?', const='{}',
                        metavar='kwargs', help='kwargs in key=value format')

    return parser.parse_args(pargs)


if __name__ == '__main__':
    runstrat()