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.List;
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 void execute(String []args,ArticleRepository repository){
        if(args.length<2){
            view.printError("Usage:analyze <url>");
        }
        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();
            //调用策略解析，但不存入Repository
            List<Article> articles=strategy.parse(url,doc);
            //统计信息
            int total=articles.size();
            double avgTitleLen=articles.stream()
                    .mapToInt(a -> a.getTitle().length())
                    .average()
                    .orElse(0.0);
            //Top 5 按标题长度排序
            List<Article> top5 =articles.stream()
                    .sorted((a,b) -> Integer.compare(b.getTitle().length(),a.getTitle().length()))
                    .limit(5)
                    .collect(Collectors.toList());
            //输出结果
            view.printInfo("=== Analysis Result ===");
            view.printInfo("Total Articles: " + total);
            view.printInfo("Avg Title Length: " + String.format("%.2f", avgTitleLen));
            view.printInfo("Top 5 Articles (by Title Length):");
            int rank = 1;
            for (Article a : top5) {
                view.printInfo(rank + ". " + a.getTitle() + " (" + a.getTitle().length() + " chars)");
                rank++;
            }
            view.printInfo("========================");
        } catch (Exception e){
            view.printError("Failed to analyze: "+e.getMessage());
        }
    }
}