#!/usr/bin/env python2
#-*- coding: utf-8 -*-

# Author         : bill86 (https://bitcointalk.org/)
# Date (RFC-3339): 2014-08-08
#
#
# Copyright 2014 bill86 (https://bitcointalk.org)
#
# 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, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTIBILITY 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/>.
#
#
# This program is based on the work, ideas and insights of the user
# kneim (https://bitcointalk.org), who shared them with the world.
# See: https://bt.irlbtc.com/view/495672.0 (german language)

from fractions import Fraction as f
import sys


def rebal_vols(actual_q=400, vol_base=10, vol_quote=4000):
    """Wiederherstellen der Balance zwischen einer Basiswährung und einer
    Quotenwährung im Portfolio.
    """
    accuracy = 100000000  # Genauigkeit bei sehr kleinen Zahlen:
                          #     hoch    = sehr kleine Zahlen darstellbar
                          #     niedrig = sehr kleine Zahlen werden auf 0
                          #               gerundet
    act_quote = f(actual_q).limit_denominator(accuracy)
    base_cur = f(vol_base).limit_denominator(accuracy)
    quote_cur = f(vol_quote).limit_denominator(accuracy)
    bal_quote = quote_cur base_cur
    difference = ((base_cur * act_quote) - quote_cur)
    if difference == 0:
        print("Differenz(Quotenw.): " + str(difference)
              + " = " + str(float(difference)))
        print("Vorgeschlagene Aktion: Keine Aktion.")
        print("Angestrebtes Portfolio:")
        print("Basiswährung:  " + str(base_cur) + " = " + str(float(base_cur)))
        print("Quotenwährung: " + str(quote_cur)
              + " = " + str(float(quote_cur)))
    elif difference > 0:
        print("Differenz(Quotenw.): " + str(difference)
              + " = " + str(float(difference)))
        print("Vorgeschlagene Aktion: Basiswährung verkaufen.")
        print("Angestrebtes Portfolio:")
        change = (1 - (bal_quote act_quote))
        new_vol_base = (base_cur - ((base_cur * change) 2))
        new_vol_quote = (quote_cur + ((base_cur - new_vol_base) * act_quote))
        diff_base = (new_vol_base - base_cur)
        diff_quote = (new_vol_quote - quote_cur)
        print("Basiswährung:  " + str(new_vol_base)
              + " = " + str(float(new_vol_base)))
        print("Quotenwährung: " + str(new_vol_quote)
              + " = " + str(float(new_vol_quote)))
        print("Veränderung(Basisw.):  " + str(diff_base)
              + " = " + str(float(diff_base)))
        print("Veränderung(Quotenw.): " + str(diff_quote)
              + " = " + str(float(diff_quote)))
    elif difference < 0:
        print("Differenz(Quotenw.): " + str(difference)
              + " = " + str(float(difference)))
        print("Vorgeschlagene Aktion: Basiswährung kaufen.")
        print("Angestrebtes Portfolio:")
        change = (1 - (act_quote bal_quote))
        new_vol_quote = (quote_cur - ((quote_cur * change) 2))
        new_vol_base = (base_cur + ((quote_cur - new_vol_quote) act_quote))
        diff_base = (new_vol_base - base_cur)
        diff_quote = (new_vol_quote - quote_cur)
        print("Basiswährung:  " + str(new_vol_base)
              + " = " + str(float(new_vol_base)))
        print("Quotenwährung: " + str(new_vol_quote)
              + " = " + str(float(new_vol_quote)))
        print("Veränderung(Basisw.):  " + str(diff_base)
              + " = " + str(float(diff_base)))
        print("Veränderung(Quotenw.): " + str(diff_quote)
              + " = " + str(float(diff_quote)))


def main():
    actual = raw_input('Aktuelle Quote: ')
    try:
        cast_act = f(actual)
    except ValueError:
        print("Bitte eine Zahl eingeben!")
        sys.exit(1)

    base_volume = raw_input('Aktuelles Volumen (Basiswährung): ')
    try:
        cast_b_vol = f(base_volume)
    except ValueError:
        print("Bitte eine Zahl eingeben!")
        sys.exit(1)

    quote_volume = raw_input('Aktuelles Volumen (Quotenwährung): ')
    try:
        cast_q_vol = f(quote_volume)
    except ValueError:
        print("Bitte eine Zahl eingeben!")
        sys.exit(1)

    rebal_vols(cast_act, cast_b_vol, cast_q_vol)


if __name__ == "__main__":
    main()

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