package com.student.view;

import com.student.model.Student;

import java.util.List;
import java.util.Scanner;

/**
 * 控制台学生视图实现类，负责在命令行界面展示学生信息和获取用户输入
 */
public class ConsoleStudentView implements StudentView {
    private final Scanner scanner;

    /**
     * 构造函数，初始化Scanner对象
     */
    public ConsoleStudentView() {
        this.scanner = new Scanner(System.in);
    }

    @Override
    public void displayStudent(Student student) {
        if (student != null) {
            System.out.println("\n===== 学生信息 =====");
            System.out.println("ID: " + student.getId());
            System.out.println("姓名: " + student.getName());
            System.out.println("年龄: " + student.getAge());
            System.out.println("课程: " + student.getCourse());
            System.out.println("==================\n");
        } else {
            System.out.println("未找到该学生信息");
        }
    }

    @Override
    public void displayAllStudents(List<Student> students) {
        if (students.isEmpty()) {
            System.out.println("当前没有学生信息");
            return;
        }

        System.out.println("\n===== 所有学生信息 =====");
        System.out.printf("%-10s %-10s %-5s %-15s\n", "ID", "姓名", "年龄", "课程");
        System.out.println("----------------------------------------");
        for (Student student : students) {
            System.out.printf("%-10s %-10s %-5d %-15s\n", 
                    student.getId(), 
                    student.getName(), 
                    student.getAge(), 
                    student.getCourse());
        }
        System.out.println("========================================\n");
    }

    @Override
    public void displayMessage(String message) {
        System.out.println(message);
    }

    @Override
    public String getStudentIdInput() {
        System.out.print("请输入学生ID: ");
        return scanner.nextLine();
    }

    @Override
    public Student getStudentInput() {
        System.out.println("请输入学生信息:");
        System.out.print("ID: ");
        String id = scanner.nextLine();
        System.out.print("姓名: ");
        String name = scanner.nextLine();
        System.out.print("年龄: ");
        int age = Integer.parseInt(scanner.nextLine());
        System.out.print("课程: ");
        String course = scanner.nextLine();
        return new Student(id, name, age, course);
    }

    @Override
    public void displayMenu() {
        System.out.println("\n===== 学生管理系统 =====");
        System.out.println("1. 添加学生");
        System.out.println("2. 查看所有学生");
        System.out.println("3. 查找学生");
        System.out.println("4. 更新学生信息");
        System.out.println("5. 删除学生");
        System.out.println("0. 退出系统");
        System.out.println("=======================");
    }

    @Override
    public int getMenuChoice() {
        System.out.print("请选择操作 (0-5): ");
        try {
            return Integer.parseInt(scanner.nextLine());
        } catch (NumberFormatException e) {
            return -1; // 无效输入
        }
    }
}