/**
 * 证书类
 * 表示员工获得的培训证书
 * 遵循单一职责原则
 */
package com.employeetraining.certificate;

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.Objects;

public class Certificate {
    private String certificateId;
    private String employeeId;
    private String courseId;
    private String certificateName;
    private LocalDate issueDate;
    private LocalDate expiryDate;
    private String issuingAuthority;
    private CertificateStatus status;
    
    public Certificate() {
    }
    
    public Certificate(String certificateId, String employeeId, String courseId, 
                      String certificateName, LocalDate issueDate, 
                      LocalDate expiryDate, String issuingAuthority, 
                      CertificateStatus status) {
        this.certificateId = certificateId;
        this.employeeId = employeeId;
        this.courseId = courseId;
        this.certificateName = certificateName;
        this.issueDate = issueDate;
        this.expiryDate = expiryDate;
        this.issuingAuthority = issuingAuthority;
        this.status = status;
    }
    
    // Getters and Setters
    public String getCertificateId() {
        return certificateId;
    }
    
    public void setCertificateId(String certificateId) {
        this.certificateId = certificateId;
    }
    
    public String getEmployeeId() {
        return employeeId;
    }
    
    public void setEmployeeId(String employeeId) {
        this.employeeId = employeeId;
    }
    
    public String getCourseId() {
        return courseId;
    }
    
    public void setCourseId(String courseId) {
        this.courseId = courseId;
    }
    
    public String getCertificateName() {
        return certificateName;
    }
    
    public void setCertificateName(String certificateName) {
        this.certificateName = certificateName;
    }
    
    public LocalDate getIssueDate() {
        return issueDate;
    }
    
    public void setIssueDate(LocalDate issueDate) {
        this.issueDate = issueDate;
    }
    
    public String getFormattedIssueDate() {
        if (issueDate == null) {
            return "N/A";
        }
        return issueDate.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
    }
    
    public LocalDate getExpiryDate() {
        return expiryDate;
    }
    
    public void setExpiryDate(LocalDate expiryDate) {
        this.expiryDate = expiryDate;
    }
    
    public String getFormattedExpiryDate() {
        if (expiryDate == null) {
            return "永久有效";
        }
        return expiryDate.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
    }
    
    public String getIssuingAuthority() {
        return issuingAuthority;
    }
    
    public void setIssuingAuthority(String issuingAuthority) {
        this.issuingAuthority = issuingAuthority;
    }
    
    public CertificateStatus getStatus() {
        return status;
    }
    
    public void setStatus(CertificateStatus status) {
        this.status = status;
    }
    
    /**
     * 检查证书是否过期
     */
    public boolean isExpired() {
        return expiryDate != null && LocalDate.now().isAfter(expiryDate);
    }
    
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Certificate that = (Certificate) o;
        return Objects.equals(certificateId, that.certificateId);
    }
    
    @Override
    public int hashCode() {
        return Objects.hash(certificateId);
    }
    
    @Override
    public String toString() {
        return "Certificate{" +
                "certificateId='" + certificateId + '\'' +
                ", certificateName='" + certificateName + '\'' +
                ", status=" + status +
                ", issueDate=" + getFormattedIssueDate() +
                ", expiryDate=" + getFormattedExpiryDate() +
                '}';
    }
    
    /**
     * 证书状态枚举
     */
    public enum CertificateStatus {
        ACTIVE,
        EXPIRED,
        REVOKED,
        PENDING
    }
}