import json

class StudentManagementSystem:
    def __init__(self):
        # 存储学员信息的列表
        self.students = []
        # 记录当前操作，用于提示用户
        self.current_operation = None

    def display_menu(self):
        # 显示系统菜单
        print("\n学生信息管理系统")
        print("1. 添加学员信息")
        print("2. 删除学员信息")
        print("3. 修改学员信息")
        print("4. 保存学员信息")
        print("5. 查询学员信息")
        print("6. 显示学员信息")
        print("7. 退出系统")

    def add_student(self, name, gender, phone_number):
        # 添加学员信息
        student = {
            "姓名": name,
            "性别": gender,
            "手机号": phone_number
        }
        self.students.append(student)
        self.current_operation = "添加学员信息"

    def delete_student(self, name):
        # 删除学员信息
        for student in self.students:
            if student["姓名"] == name:
                self.students.remove(student)
                self.current_operation = "删除学员信息"
                return True
        return False

    def modify_student(self, name, new_data):
        # 修改学员信息
        for i, student in enumerate(self.students):
            if student["姓名"] == name:
                self.students[i] = new_data
                self.current_operation = "修改学员信息"
                return True
        return False

    def save_data(self, filename="student_data.json"):
        # 保存学员信息到文件（JSON格式）
        with open(filename, "w", encoding="utf-8") as file:
            json.dump(self.students, file, ensure_ascii=False, indent=4)
        print("数据保存成功！")

    def query_student(self, name):
        # 查询学员信息
        for student in self.students:
            if student["姓名"] == name:
                return student
        return None

    def display_students(self):
        # 显示所有学员信息
        if not self.students:
            print("暂无学员信息")
        else:
            for student in self.students:
                print(student)

    def run(self):
        while True:
            # 运行系统主循环
            self.display_menu()
            choice = input("请输入您的选择：")

            if choice == "1":
                # 添加学员信息
                name = input("请输入姓名：")
                gender = input("请输入性别：")
                phone_number = input("请输入手机号：")
                self.add_student(name, gender, phone_number)

            elif choice == "2":
                # 删除学员信息
                name = input("请输入要删除的学员姓名：")
                if self.delete_student(name):
                    print("学员信息删除成功！")
                else:
                    print("未找到学员信息，删除失败！")

            elif choice == "3":
                # 修改学员信息
                name = input("请输入要修改的学员姓名：")
                new_data = {
                    "姓名": input("请输入新的姓名："),
                    "性别": input("请输入新的性别："),
                    "手机号": input("请输入新的手机号：")
                }
                if self.modify_student(name, new_data):
                    print("学员信息修改成功！")
                else:
                    print("未找到学员信息，修改失败！")

            elif choice == "4":
                # 保存学员信息到文件
                self.save_data()

            elif choice == "5":
                # 查询学员信息
                name = input("请输入要查询的学员姓名：")
                student = self.query_student(name)
                if student:
                    print("学员信息查询成功：", student)
                else:
                    print("未找到学员信息！")

            elif choice == "6":
                # 显示所有学员信息
                self.display_students()

            elif choice == "7":
                # 退出系统
                print("感谢使用学生信息管理系统，再见！")
                break

            else:
                print("无效的选择，请重新输入。")

            if self.current_operation:
                # 提示用户操作完成
                print(f"{self.current_operation}操作完成，数据已更新。")
                self.current_operation = None

if __name__ == "__main__":
    # 实例化学生信息管理系统并运行
    sms = StudentManagementSystem()
    sms.run()