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

/**
 * Model: 文章实体，只存放数据，无任何 I/O 代码
 */
public class Article {
    private String title;
    private String url;
    private String content;
    private String author;                          // 作业1：新增 author
    private LocalDate publishDate;                  // 作业1：新增 publishDate

    public Article(String title, String url, String content,
                   String author, LocalDate publishDate) {
        this.title       = title;
        this.url         = url;
        this.content     = content;
        this.author      = author;
        this.publishDate = publishDate;
    }

    // ── getters ──
    public String    getTitle()       { return title; }
    public String    getUrl()         { return url; }
    public String    getContent()     { return content; }
    public String    getAuthor()      { return author; }
    public LocalDate getPublishDate() { return publishDate; }

    @Override
    public String toString() {
        String dateStr = (publishDate != null)
            ? publishDate.format(DateTimeFormatter.ISO_LOCAL_DATE) : "unknown";
        return String.format("[%s] %s  (by %s, %s)", url, title, author, dateStr);
    }
}