import hashlib

def get_md5(user,pwd):
    md5 = hashlib.md5(user.encode('utf-8'))  # md5 算法加密
    md5.update(pwd.encode('utf-8'))
    return md5.hexdigest()

def register():
    '''
    用户注册
    :return:
    '''
    while True:
        print('*****用户注册*****')
        user = input('请输入账户(输入n返回上一级):')
        if user.upper() == 'N': return
        pwd = input('请输入密码:')
        flag = False
        with open('userinfo',mode='r',encoding='utf-8') as f:  #  打开用户文件,判断用户名是否存在
            for line in f:
                if user in line.strip().split('|'):
                    flag = True
        if flag:
            print('用户名已存在,请重新输入')
        else:
            with open('userinfo',mode='a',encoding='utf-8') as f:  # 将用户注册的信息写入到用户文件中
                f.write('%s|%s\n' %(user,get_md5(user,pwd)))  # 将用户的密码以密文的形式存储在文件中
                print('\033[1;31m注册成功\033[0m')

def login():
    '''
    用户登入
    :return:
    '''
    count = 1
    while True:
        print('*****用户登入*****')
        user = input('请输入账户(输入n返回上一级):')
        if user.upper() == 'N': return
        pwd = input('请输入密码:')
        with open('freeze',mode='r',encoding='utf-8') as f:   # 打开冻结文件,判断用户输入的用户名是否在冻结文件中
            content = f.read().strip().split('|')
            if user in content:
                print('此用户已冻结,请重新输入账户')
                continue
        flag = False
        new_name = False
        with open('userinfo',mode='r',encoding='utf-8') as f:
            for line in f:
                a,b  = line.strip().split('|')
                if user == a:      # 判断用户名是否存在
                    new_name = True
                if a == user and b == get_md5(user,pwd):  # 判断账户密码是否正确
                    flag = True
                    print('\033[1;34m登入成功\033[0m')
                    exit()
        if not new_name:
            print('账户不存在请重新输入')
            continue
        if not flag:
            print('账号或密码错误,请重新输入')
            count += 1
            if count == 4:
                print('输错三次,已被冻结')
                with open('freeze',mode='w',encoding='utf-8') as f:  # 将输错三次的用户名写入到冻结文件中
                    f.write(user+ '\n')
                    return

def run():
    '''
    程序入口
    :return:
    '''
    info = {'1':register,'2':login}
    while True:
        print('''管理界面
        1.用户注册
        2.用户登入''')
        choice = input('请选择服务(输入N退出):')
        if choice.upper() == 'N': break
        data = info.get(choice)
        if not data:
            print('输入有误,请重新输入')
            continue
        data()


if __name__ == '__main__':
    run()