import PySimpleGUI as sg
import openpyxl
import xlrd
import random

def TakeRoll():
    book = xlrd.open_workbook('sample.xlsx')
    sheet = book.sheet_by_index(0)
    book = openpyxl.load_workbook(filename='sample.xlsx')
    ins_sheet = book.active
    if sheet.ncols == 2:
        ins_sheet['C1'] = 'Scredit'
        idx = random.randint(2, sheet.nrows)
        stu = str(ins_sheet.cell(row=idx, column=1).value) + ins_sheet.cell(row=idx, column=2).value
        i = 2
        while i <= sheet.nrows:
            ins_sheet.cell(row=i, column=3).value = 0
            i += 1
        book.save(filename='sample.xlsx')
        return stu, idx
    else: #学生表中含有已创建的SCredit列
        max = 0
        credit = ins_sheet['C'] #将SCredit列存入redit数组
        i = 1
        while i <= sheet.nrows-1:
            credit[i].value *= 2 #将所有积分值整数化（所有非整数积分值小数部分均为0.5）
            i += 1
        i = 1
        while i <= sheet.nrows-1:
            if credit[i].value > max:
                max = credit[i].value
            i += 1
        max += 1 #求出最大积分值并加1
        slct = []
        i = 1
        while i <= sheet.nrows-1:
            credit[i].value = max - credit[i].value #倒转积分值，将最大的积分值置为1，其余积分依次增大
            r = 1
            while r <= int(credit[i].value):
                slct.append(i)
                r += 1 #第i个学生倒转后的积分值即为slct数组中对应第i个学生的元素个数，和该生被选中的概率呈负相关
            i += 1
        idx = random.randint(0, len(slct)-1)
        stu = str(ins_sheet.cell(row=slct[idx]+1, column=1).value) + ins_sheet.cell(row=slct[idx]+1, column=2).value
        return stu, slct[idx]+1

def CreditUpdate(stu, isInc, point):
    book = openpyxl.load_workbook(filename='sample.xlsx')
    sheet = book.active
    if isInc == True:
        sheet.cell(row=stu, column=3).value += point
    else:
        sheet.cell(row=stu, column=3).value -= point
    book.save(filename='sample.xlsx')

layoutA = [
    [sg.Text('被点到的同学：'), sg.Text('', key = 'roll')],
    [sg.Button('点名')]
]

layoutB1 = [
    [sg.Button('是'), sg.Button('否')],
]

layoutB2 = [
    [sg.Button('是'), sg.Button('否')],
]

layoutB3 = [
    [sg.Button('是'), sg.Button('否')],
]

layoutC = [
    [sg.Button('回答问题'), sg.Button('请ta坐下')],
]

List = [0.5, 1.0, 1.5, 2.0, 2.5, 3.0]
layoutD = [
    [sg.Drop(List,
            default_value = None,
            size = (30, 6),
            enable_events = True,
            key = 'point'
            )],
    [sg.Button('确认')]
]

window = sg.Window('点名', layoutA)
while True:
    event, values = window.read()
    if event == sg.WINDOW_CLOSED:
        break
    if event == '点名':
        ret, rownum = TakeRoll()
        window['roll'].update(value=ret)
        window = sg.Window('该同学是否到位？', layoutB1)
        while True:
            event, values = window.read()
            if event in (sg.WINDOW_CLOSED, '否'):
                break
            if event == '是':
                CreditUpdate(rownum, True, 1.0)
                window = sg.Window('接下来...', layoutC)
                while True:
                    event, values = window.read()
                    if event in (sg.WINDOW_CLOSED, '请ta坐下'):
                        break
                    if event == '回答问题':
                        window = sg.Window('该同学能否复述问题？', layoutB2)
                        while True:
                            event, values = window.read()
                            if event == sg.WINDOW_CLOSED:
                                break
                            if event == '是':
                                CreditUpdate(rownum, True, 0.5)
                                window = sg.Window('该同学答对问题了吗？', layoutB3)
                                while True:
                                    event, values = window.read()
                                    if event in (sg.WINDOW_CLOSED, '否'):
                                        break
                                    if event == '是':
                                        window = sg.Window('给ta打分：', layoutD)
                                        while True:
                                            event, values = window.read()
                                            if event == sg.WINDOW_CLOSED:
                                                break
                                            if event == '确认':
                                                CreditUpdate(rownum, True, values['point'])
                                                break
                                        break
                                break
                            if event == '否':
                                CreditUpdate(rownum, False, 1.0)
                                break
                        break
                break
        break

window.close()