#!/usr/bin/env python
# encoding: utf-8

from random_expression import RdExpression
from random import choice

affine = RdExpression("{a}x + {b}", \
        conditions  =["{b} > 0"], \
        with_Exp = False)
affine_minus = RdExpression("{a}x - {b}", 
        conditions  =["{b} > 0"], \
        with_Exp = False)
affine_frac = RdExpression("\frac{ {a} }{ {c} }x + {b}", \
        conditions  =["{b} > 0", "{c} > 0"], \
        with_Exp = False)

double_prod = RdExpression("({a}x + {b})({c}x + {d})",
        conditions  =["{b} > 0", "{d} >0"], \
        with_Exp = False)
double_prod_minus1 = RdExpression("({a}x - {b})({c}x + {d})",
        conditions  =["{b} > 0", "{d} >0"], \
        with_Exp = False)
double_prod_minus2 = RdExpression("({a}x + {b})({c}x - {d})",
        conditions  =["{b} > 0", "{d} >0"], \
        with_Exp = False)

eq = {"affine" : lambda : choice([affine, affine_minus])(), \
        "affine_frac": affine_frac, \
        "double_prod": lambda: choice([double_prod, double_prod_minus1, double_prod_minus2])()}






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