package com.foxinmy.weixin4j.tuple;
   
   import java.util.LinkedList;
   import java.util.List;
   
   import javax.xml.bind.annotation.XmlElement;
   import javax.xml.bind.annotation.XmlTransient;
   
   import com.alibaba.fastjson.annotation.JSONField;
  
  /**
   * 图文对象
   * <p>
   * <font color="red">可用于「客服消息」</font>
   * </p>
   *
   * @className News
   * @author jinyu(foxinmy@gmail.com)
   * @date 2014年11月21日
   * @since JDK 1.6
   * @see
   */
  public class News implements NotifyTuple {
  
  	private static final long serialVersionUID = 3348756809039388415L;
  
  	@Override
  	public String getMessageType() {
  		return "news";
  	}
  
  	/**
  	 * 允许最多的图文列表数
  	 */
  	private static final int MAX_ARTICLE_COUNT = 8;
  
  	/**
  	 * 图文列表
  	 *
  	 * @see com.foxinmy.weixin4j.tuple.Article
  	 */
  	@JSONField(name = "articles")
  	@XmlElement(name = "Articles")
  	private LinkedList<Article> articles;
  
  	public News() {
  		this.articles = new LinkedList<Article>();
  	}
  
  	/**
  	 *
  	 * @param title
  	 *            标题
  	 * @param desc
  	 *            描述
  	 * @param picUrl
  	 *            图片链接
  	 * @param url
  	 *            跳转URL
  	 */
  	public News addArticle(String title, String desc, String picUrl, String url) {
  		return addArticle(new Article(title, desc, picUrl, url));
  	}
  
  	public News addArticle(Article... articles) {
  		for (Article article : articles) {
  			this.articles.add(article);
  		}
  		return this;
  	}
  
  	public News addFirstArticle(Article article) {
  		articles.addFirst(article);
  		return this;
  	}
  
  	public void addLastArticle(Article article) {
  		articles.addLast(article);
  	}
  
  	public News removeFirstArticle() {
  		articles.removeFirst();
  		return this;
  	}
  
  	public News removeLastArticle() {
  		articles.removeLast();
  		return this;
  	}
  
  	@JSONField(serialize = false)
  	@XmlTransient
  	public boolean isMaxCount() {
  		return articles.size() == MAX_ARTICLE_COUNT;
  	}
  
  	public List<Article> getArticles() {
  		if (articles.size() > MAX_ARTICLE_COUNT) {
  			return articles.subList(0, MAX_ARTICLE_COUNT);
 		} else {
 			return articles;
 		}
 	}
 
 	@JSONField(serialize = false)
 	@XmlTransient
 	public List<Article> getFullArticles() {
 		return articles;
 	}
 
 	@Override
 	public String toString() {
 		StringBuilder sb = new StringBuilder();
 		for (Article article : articles) {
 			sb.append("{title=").append(article.getTitle());
 			sb.append(" ,description=").append(article.getDesc());
 			sb.append(" ,picUrl=").append(article.getPicUrl());
 			sb.append(" ,url=").append(article.getUrl()).append("}");
 		}
 		return sb.toString();
 	}
 }