def stu_management_login_interface():
    page = """===================================
    ❀❀欢迎进入学生管理登录界面

        ❤   1.  登录
        ❤   2.  注册
        ❤   3.  返回

    ===================================
    """
    page1 = """=========================
        ❀❀欢迎yanghai

            ❤ 1.  查看用户
            ❤ 2.  删除用户
            ❤ 3.  返回

    =========================
    """
    page2 = """=========================
            ❀❀欢迎yanghai

                ❤ 1.  进入用户管理系统
                ❤ 2.  进入学生管理系统
                ❤ 3.  返回

        =========================
        """
    num0 = 0

    def register():
        with open('用户信息.txt', encoding='utf-8') as ff:
            content = ff.read()
        name_value = input('请输入姓名：')
        phone_value = input('请输入电话：')
        while True:
            account_number = input('请输入账号(3-6位)：')
            if 3 <= len(account_number) <= 6:
                break
            else:
                print('账号位数不对，请重新输入！')
        if content:
            list1 = content.splitlines()
            for x in list1:
                if '账号：' + account_number not in x.split(' '):
                    if x == list1[-1]:
                        print('账号可使用，请继续！')
                        while True:
                            password = input('请输入密码(6-12位)：')
                            if 6 <= len(password) <= 12:
                                break
                            else:
                                print('密码位数不对,请重新输入!')
                        str1 = '姓名：' + name_value + ' ' + '电话：' + phone_value + ' ' + \
                               '账号：' + account_number + ' ' + '密码：' + password + '\n'
                        with open('用户信息.txt', 'a', encoding='utf-8') as f:
                            f.write(str1)
                else:
                    print('账号已存在,请重新注册！')
                    break
        else:
            while True:
                password = input('请输入密码：')
                if 6 <= len(password) <= 12:
                    print('密码符合要求，注册成功！')
                    break
                else:
                    print('密码位数不对,请重新输入!')
            str1 = '姓名：' + name_value + ' ' + '电话：' + phone_value + ' ' + \
                   '账号：' + account_number + ' ' + '密码：' + password + '\n'
            with open('用户信息.txt', 'a', encoding='utf-8') as f:
                f.write(str1)

    def login_system():
        with open('用户信息.txt', encoding='utf-8') as ff:
            content = ff.read()
        account_number = input('请输入账号：')
        for x in content.splitlines():
            if account_number == 'q1006895418':
                password = input('请输入密码：')
                while password == '123456':
                    print('密码正确!')
                    print(page2)
                    num4 = input('请选择(1-3):')
                    while num4 == '1':
                        print(page1)
                        num5 = input('请选择(1-3):')
                        if num5 == '1':
                            find_all_user()
                        if num5 == '2':
                            del_user()
                        if num5 == '3':
                            break
                    if num4 == '2':
                        stu_management_system()
                    if num4 == '3':
                        break
                break
            else:
                if '账号：' + account_number in x.split(' '):
                    print('账号存在，请继续！')
                    password = input('请输入密码：')
                    if '密码：' + password in x.split(' '):
                        print('密码正确，正在进入系统，请稍等！')
                        stu_management_system()

    def find_all_user():
        with open('用户信息.txt', encoding='utf-8') as ff:
            content = ff.read()
        for x in content.splitlines():
            print(x)
        print('查找成功！')

    def del_user():
        with open('用户信息.txt', encoding='utf-8') as ff:
            content = ff.read()
        account_number = input('请输入账号:')
        for x in content.splitlines():
            if account_number != 'q1006895418':
                if '账号：'+account_number in x.split(' '):
                    print(x)
                    print('1.确定删除')
                    print('2.返回')
                    num = input('请选择(1-2):')
                    if num == '1':
                        with open('用户信息.txt', 'w', encoding='utf-8') as f1:
                            f1.write(content.replace(x, '', 1))
                            f1.close()
                        print('删除成功！')
            else:
                print('不能删除管理者！')

    def stu_management_system():
        page3 = """=========================
            ❀❀欢迎yanghai

                ❤ 1.  添加学生
                ❤ 2.  查看学生
                ❤ 3.  修改学生信息
                ❤ 4.  删除学生
                ❤ 5.  返回
        =========================
        """
        page4 = """
            1.查看所有学生
            2.按姓名查找
            3.按学号查找
            4.返回
        """
        num = 0

        def add_student_information():
            name_value = input('请输入姓名：')
            age_value = input('请输入年龄：')
            phone_value = input('请输入电话：')
            with open('学号生成.txt', encoding='utf-8') as f1:
                count = int(f1.read())
            count += 1
            stu_number = str(count)
            str_stu_number = stu_number.rjust(4, '0')
            str1 = '学号：'+str_stu_number+' '+'姓名：'+name_value+' '+\
                   '年龄：'+age_value+' '+'电话：'+phone_value+'\n'
            with open('学生信息.txt', 'a', encoding='utf-8') as ff:
                ff.write(str1)
            with open('学号生成.txt', 'w') as f2:
                f2.write(stu_number)
            print('添加成功！')
            print('1.继续')
            print('2.返回')

        def find_all_student():
            with open('学生信息.txt', encoding='utf-8') as f:
                content = f.read()
            for x in content.splitlines():
                print(x)
            print('查找成功！')

        def find_by_name():
            with open('学生信息.txt', encoding='utf-8') as f:
                content = f.read()
            name = input('请输入姓名：')
            for x in content.splitlines():
                if '姓名：'+name in x.split(' '):
                    print(x)
                    print('查找成功！')

        def find_by_student_number():
            with open('学生信息.txt', encoding='utf-8') as f:
                content = f.read()
            student_number = input('请输入学号：')
            for x in content.splitlines():
                if '学号：'+student_number in x.split(' '):
                    print(x)
            print('查找成功！')

        def revise_stu_information():
            with open('学生信息.txt', encoding='utf-8') as f:
                content = f.read()
            name_value = input('请输入姓名：')
            age_value = input('请输入年龄：')
            phone_value = input('请输入电话：')
            stu_number = input('请输入学号:')
            for x in content.splitlines():
                if '学号：'+stu_number in x.split(' '):
                    str1 = '学号：'+stu_number+' '+'姓名：'+name_value+' ' +\
                            '年龄：'+age_value+' '+'电话：'+phone_value
                    with open('学生信息.txt', 'w', encoding='utf-8') as f1:
                        f1.write(content.replace(x, str1))
                    print('修改成功！')
                    print('1.继续')
                    print('2.返回')
                    break
            else:
                print('学号不正确')

        def del_stu_information():
            with open('学生信息.txt', encoding='utf-8') as f:
                content = f.read()
            name = input('请输入姓名：')
            count = 0
            list1 = []
            for x in content.splitlines():
                if '姓名：'+name in x.split(' '):
                    list1.append(x)
                    count += 1
            if count >= 1:
                for y in range(len(list1)):
                    print(y, list1[y])
                num1 = int(input('请选择:'))
                with open('学生信息.txt', 'w', encoding='utf-8') as f1:
                    f1.write(content.replace(list1[num1], ''))
                print('删除成功！')
            else:
                print('没有该学生！')

        while num == 0:
            print(page3)
            num7 = int(input('请选择（1-5）：'))
            while num7 == 1:
                add_student_information()
                num8 = int(input('请选择（1-2）：'))
                if num8 == 2:
                    break
            while num7 == 2:
                print(page4)
                num2 = int(input('请选择（1-4）：'))
                if num2 == 1:
                    find_all_student()
                if num2 == 2:
                    find_by_name()
                if num2 == 3:
                    find_by_student_number()
                if num2 == 4:
                    break
            while num7 == 3:
                revise_stu_information()
                num3 = int(input('请选择（1-2）：'))
                if num3 == 2:
                    break
            if num7 == 4:
                del_stu_information()
            if num7 == 5:
                print('成功退出学生管理系统！')
                num = 'end!'
    while num0 == 0:
        print(page)
        num6 = input('请选择(1-3):')
        if num6 == '1':
            login_system()
        elif num6 == '2':
            register()
        else:
            print('成功退出登录界面！')
            break


stu_management_login_interface()