package com.crawler.exception.handler;

import com.crawler.exception.*;
import com.crawler.exception.ExceptionHandler;

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

public class ExceptionHandlerFactory {
    private static ExceptionHandlerFactory instance;
    private List<ExceptionHandler> handlers;

    private ExceptionHandlerFactory() {
        handlers = new ArrayList<>();
        registerHandlers();
    }

    public static ExceptionHandlerFactory getInstance() {
        if (instance == null) {
            instance = new ExceptionHandlerFactory();
        }
        return instance;
    }

    private void registerHandlers() {
        handlers.add(new NetworkExceptionHandler());
        handlers.add(new ParseExceptionHandler());
        handlers.add(new CacheExceptionHandler());
        handlers.add(new ConfigurationExceptionHandler());
        handlers.add(new CrawlerExceptionHandler());
    }

    public ExceptionHandler getHandler(Exception e) {
        for (ExceptionHandler handler : handlers) {
            if (handler.getSupportedExceptionType().isInstance(e)) {
                return handler;
            }
        }
        return null;
    }

    public void handleException(Exception e, com.crawler.view.CrawlerView view) {
        ExceptionHandler handler = getHandler(e);
        if (handler != null) {
            handler.handle(e, view);
        } else {
            view.showErrorMessage("未知异常: " + e.getMessage());
        }
    }
}