import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class TitleLengthAnalyzer implements ArticleAnalyzer {
    @Override
    public Map<String, Object> analyze(List<Article> articles) {
        Map<String, Object> result = new HashMap<>();
        
        if (articles.isEmpty()) {
            result.put("analyzer", getName());
            result.put("averageLength", 0);
            result.put("maxLength", 0);
            result.put("minLength", 0);
            return result;
        }

        int totalLength = articles.stream()
                .mapToInt(a -> a.getTitle().length())
                .sum();
        
        int maxLength = articles.stream()
                .mapToInt(a -> a.getTitle().length())
                .max()
                .orElse(0);
        
        int minLength = articles.stream()
                .mapToInt(a -> a.getTitle().length())
                .min()
                .orElse(0);

        result.put("analyzer", getName());
        result.put("averageLength", (double) totalLength / articles.size());
        result.put("maxLength", maxLength);
        result.put("minLength", minLength);
        
        return result;
    }

    @Override
    public String getName() {
        return "标题长度分析器";
    }
}