java/w10/AnalyzeCommand.java

package com.example.datacollect.command;

import com.example.datacollect.model.Article;
import com.example.datacollect.repository.ArticleRepository;
import com.example.datacollect.strategy.CrawlStrategy;
import com.example.datacollect.strategy.StrategyFactory;
import com.example.datacollect.view.ConsoleView;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

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

public class AnalyzeCommand implements Command {
    private final ConsoleView view;
    private final StrategyFactory strategyFactory;

    public AnalyzeCommand(ConsoleView view, StrategyFactory strategyFactory) {
        this.view = view;
        this.strategyFactory = strategyFactory;
    }

    @Override
    public String getName() {
        return "analyze";
    }

    @Override
    public String getDescription() {
        return "analyze <url> - 分析URL页面内容，输出统计信息（不保存）";
    }

    @Override
    public void execute(String[] args, ArticleRepository repository) {
        if (args.length < 2) {
            view.printError("Usage: analyze <url>");
            return;
        }
        String url = args[1];

        CrawlStrategy strategy = strategyFactory.getStrategy(url);
        if (strategy == null) {
            view.printError("No strategy found for: " + url);
            return;
        }

        try {
            view.printInfo("Analyzing: " + url);
            Document doc = Jsoup.connect(url).get();
            List<Article> articles = strategy.parse(url, doc);

            printStatistics(articles, url);
        } catch (Exception e) {
            view.printError("Failed to analyze: " + e.getMessage());
        }
    }

    private void printStatistics(List<Article> articles, String url) {
        view.printSuccess("=== 分析报告 ===");
        view.printInfo("解析策略: " + strategyFactory.getStrategy(url).getClass().getSimpleName());
        view.printInfo("URL: " + url);
        view.printInfo("文章数量: " + articles.size());

        if (articles.isEmpty()) {
            view.printInfo("未解析到任何文章");
            return;
        }

        int emptyTitles = 0;
        int minTitleLength = Integer.MAX_VALUE;
        int maxTitleLength = 0;
        int totalTitleLength = 0;

        for (Article article : articles) {
            String title = article.getTitle();
            if (title == null || title.trim().isEmpty()) {
                emptyTitles++;
            } else {
                int len = title.length();
                minTitleLength = Math.min(minTitleLength, len);
                maxTitleLength = Math.max(maxTitleLength, len);
                totalTitleLength += len;
            }
        }

        view.printInfo("--- 标题统计 ---");
        if (emptyTitles > 0) {
            view.printInfo("空标题数量: " + emptyTitles);
        }
        view.printInfo("最短标题长度: " + (minTitleLength == Integer.MAX_VALUE ? 0 : minTitleLength));
        view.printInfo("最长标题长度: " + maxTitleLength);
        view.printInfo("平均标题长度: " + String.format("%.1f", (double) totalTitleLength / (articles.size() - emptyTitles)));

        String domain = extractDomain(url);
        Map<String, Long> domainDistribution = articles.stream()
                .map(a -> extractDomain(a.getUrl()))
                .collect(Collectors.groupingBy(d -> d, Collectors.counting()));

        view.printInfo("--- 来源域名分布 ---");
        for (Map.Entry<String, Long> entry : domainDistribution.entrySet()) {
            view.printInfo("  " + entry.getKey() + ": " + entry.getValue() + " 篇");
        }
    }

    private String extractDomain(String url) {
        try {
            int start = url.indexOf("://");
            if (start == -1) return "unknown";
            int end = url.indexOf("/", start + 3);
            if (end == -1) return url.substring(start + 3);
            return url.substring(start + 3, end);
        } catch (Exception e) {
            return "unknown";
        }
    }
}