package com.example.datacollect.repository;

import com.example.datacollect.model.Article;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class ArticleRepository {
    private static final Logger logger = LoggerFactory.getLogger(ArticleRepository.class);
    private final List<Article> articles = new ArrayList<>();

    public void add(Article article) {
        // 防御检查
        if (article == null) {
            logger.error("Attempted to add null article");
            throw new IllegalArgumentException("Article cannot be null");
        }
        if (article.getTitle() == null || article.getTitle().isBlank()) {
            logger.error("Attempted to add article with null or blank title: {}", article.getUrl());
            throw new IllegalArgumentException("Article title cannot be null or blank");
        }
        if (article.getUrl() == null || article.getUrl().isBlank()) {
            logger.error("Attempted to add article with null or blank URL");
            throw new IllegalArgumentException("Article URL cannot be null or blank");
        }

        articles.add(article);
        logger.debug("Article added: {} - {}", article.getTitle(), article.getUrl());
    }

    public List<Article> getAll() {
        logger.debug("Retrieved {} articles", articles.size());
        return Collections.unmodifiableList(articles);
    }

    public int size() {
        return articles.size();
    }

    public void clear() {
        logger.info("Clearing all articles, previous count: {}", articles.size());
        articles.clear();
    }
}