import java.time.LocalDate;

/**
 * 员工类 - 负责员工基本信息管理
 * 遵循单一职责原则：只负责员工数据的存储和基本验证
 */
public class Employee {
    private String id;              // 员工ID
    private String name;            // 员工姓名
    private double salary;          // 薪资
    private String department;      // 部门
    private String position;        // 职位
    private LocalDate hireDate;     // 入职日期
    private LocalDate birthDate;    // 出生日期
    private String email;           // 邮箱（新增属性）
    private boolean active;         // 是否在职
    
    /**
     * 构造函数 - 创建员工对象
     */
    public Employee(String id, String name, double salary, String department, 
                   String position, LocalDate hireDate, LocalDate birthDate, String email) {
        this.id = id;
        this.name = name;
        this.salary = salary;
        this.department = department;
        this.position = position;
        this.hireDate = hireDate;
        this.birthDate = birthDate;
        this.active = true;
        setEmail(email); // 使用setter进行邮箱验证
    }
    
    /**
     * 设置邮箱 - 包含验证逻辑
     * @param email 邮箱地址
     * @throws IllegalArgumentException 如果邮箱格式无效
     */
    public void setEmail(String email) {
        if (isValidEmail(email)) {
            this.email = email;
        } else {
            throw new IllegalArgumentException("无效的邮箱格式: " + email);
        }
    }
    
    /**
     * 邮箱格式验证
     * @param email 邮箱地址
     * @return true如果邮箱格式有效
     */
    private boolean isValidEmail(String email) {
        if (email == null || email.trim().isEmpty()) {
            return false;
        }
        // 基本的邮箱格式验证正则表达式
        String emailRegex = "^[A-Za-z0-9+_.-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}$";
        return email.matches(emailRegex);
    }
    
    /**
     * 获取员工年龄
     * @return 员工年龄
     */
    public int getAge() {
        LocalDate now = LocalDate.now();
        int age = now.getYear() - birthDate.getYear();
        if (now.getMonthValue() < birthDate.getMonthValue() || 
            (now.getMonthValue() == birthDate.getMonthValue() && 
             now.getDayOfMonth() < birthDate.getDayOfMonth())) {
            age--;
        }
        return age;
    }
    
    /**
     * 获取员工司龄
     * @return 员工司龄（年）
     */
    public int getTenure() {
        LocalDate now = LocalDate.now();
        int tenure = now.getYear() - hireDate.getYear();
        if (now.getMonthValue() < hireDate.getMonthValue() || 
            (now.getMonthValue() == hireDate.getMonthValue() && 
             now.getDayOfMonth() < hireDate.getDayOfMonth())) {
            tenure--;
        }
        return tenure;
    }
    
    // Getter和Setter方法 - 遵循单一职责原则，只负责属性的访问和修改
    
    public String getId() { return id; }
    
    public String getName() { return name; }
    
    public void setName(String name) { this.name = name; }
    
    public double getSalary() { return salary; }
    
    public void setSalary(double salary) {
        if (salary >= 0) {
            this.salary = salary;
        } else {
            throw new IllegalArgumentException("薪资不能为负数");
        }
    }
    
    public String getDepartment() { return department; }
    
    public void setDepartment(String department) { this.department = department; }
    
    public String getPosition() { return position; }
    
    public void setPosition(String position) { this.position = position; }
    
    public LocalDate getHireDate() { return hireDate; }
    
    public LocalDate getBirthDate() { return birthDate; }
    
    public String getEmail() { return email; }
    
    public boolean isActive() { return active; }
    
    public void setActive(boolean active) { this.active = active; }
    
    @Override
    public String toString() {
        return "Employee{" +
               "id='" + id + "'" +
               ", name='" + name + "'" +
               ", salary=" + salary +
               ", department='" + department + "'" +
               ", position='" + position + "'" +
               ", hireDate=" + hireDate +
               ", age=" + getAge() +
               ", tenure=" + getTenure() + "年" +
               ", email='" + email + "'" +
               ", active=" + (active ? "在职" : "离职") +
               "}";
    }
}