# -*- coding: utf-8 -*-
# @Time : 2018/3/24 22:06 
# @Author : Lv Zhangrun 
# @Site :  
# @File : CreateExercises2.py 
# @Software: PyCharm
import random
import Calculate

listOperators = ["+", "-", "×", "÷"]
countOperatorNumber = 3
maxNumber = 10

def getFraction():
    numerator = random.randint(1, maxNumber)
    denominator = random.randint(1, maxNumber)
    n = min(numerator, denominator)
    maxCommonDivisor = 0  # 公约数
    for i in range(1, n + 1):  # 找最大公约数
        if numerator % i == 0 and denominator % i == 0:
            maxCommonDivisor = i
    a = int(numerator / maxCommonDivisor)  # 约分
    b = int(denominator / maxCommonDivisor)
    if a == b:
        return 1
    elif b == 1:
        return a
    elif a > b:
        return str(int(a / b)) + "’" + str(int(a % b)) + "/" + str(b)
    else:
        return str(a) + "/" + str(b)


def createExercises(countOperatorNumber, listExercise):
    if countOperatorNumber == 1:  # 子数操作数为1时，单独生成[1]为一组
        temp = []
        if random.randint(0, 1) == 0:
            temp.append(getFraction())
        else:
            temp.append(random.randint(1, maxNumber))
        listExercise.append(temp)
        return listExercise
    elif countOperatorNumber == 2:  # 子数操作数为2时，生成['(',2,'+',3,')']为一组
        temp = []
        temp.append("(")
        if random.randint(0, 1) == 0:
            temp.append(getFraction())
        else:
            temp.append(random.randint(1, maxNumber))
        temp.append(listOperators[random.randint(0, 3)])
        if random.randint(0, 1) == 0:
            temp.append(getFraction())
        else:
            temp.append(random.randint(1, maxNumber))
        temp.append(")")
        listExercise.append(temp)
        return listExercise
    else:
        # 左子数操作
        left_countOperatorNumber = random.randint(1, countOperatorNumber - 1)  # 为左子数分配操作数个数
        createExercises(left_countOperatorNumber, listExercise)
        # 左子数和右子数之间补充一个操作符
        listExercise.append(listOperators[random.randint(0, 3)])
        # 右子数操作
        right_countOperatorNumber = countOperatorNumber - left_countOperatorNumber
        createExercises(right_countOperatorNumber, listExercise)
        return listExercise


if __name__ == '__main__':
    for i in range(5):
        listExercise = []
        # countOperatorNumber=random.randint(2,4)
        temp = createExercises(countOperatorNumber, listExercise)
        # print(temp)
        expression = ""
        for tempElement in temp:
            if type(tempElement) == list:
                for l in range(len(tempElement)):
                    expression = expression + str(tempElement[l])
            else:
                expression = expression + str(tempElement)
            if countOperatorNumber == 2:
                expression=expression[1:len(expression)-1]
        test= Calculate.Calculator().calculate(expression)
        print(expression+"="+str(test))