package com.example.datacollect.controller;

import com.example.datacollect.command.*;
import com.example.datacollect.model.Article;
import com.example.datacollect.view.ConsoleView;

import java.util.*;
import java.util.regex.Pattern;

public class CrawlerController {
    private final Map<String, Command> commands = new HashMap<>();
    private final Map<String, String> aliases = new HashMap<>();
    private final ConsoleView view;
    private final List<Article> articles;
    private final List<String> commandHistory;
    private final HistoryCommand historyCommand;

    private static final Pattern URL_PATTERN = Pattern.compile(
            "^(https?://)?([\\da-z.-]+)\\.([a-z.]{2,6})([/\\w.-]*)*(/?)"
    );

    public CrawlerController(ConsoleView view, List<Article> articles) {
        this.view = view;
        this.articles = articles;
        this.commandHistory = new ArrayList<>();
        this.historyCommand = new HistoryCommand(view, commandHistory);
        
        register(new HelpCommand(view));
        register(new ListCommand(view));
        register(new CrawlCommand(view));
        register(new ExitCommand(view));
        register(historyCommand);
        
        registerAliases();
    }

    private void register(Command command) {
        commands.put(command.getName(), command);
    }

    private void registerAliases() {
        aliases.put("c", "crawl");
        aliases.put("ls", "list");
        aliases.put("h", "help");
        aliases.put("q", "exit");
    }

    public void handle(String input) {
        String text = input == null ? "" : input.trim();
        if (text.isEmpty()) {
            return;
        }

        commandHistory.add(text);

        String[] args = text.split("\\s+");
        String cmdName = args[0].toLowerCase();

        String actualCommand = aliases.getOrDefault(cmdName, cmdName);
        Command command = commands.get(actualCommand);

        if (command == null) {
            view.printError("Unknown command: " + cmdName);
            return;
        }

        if ("crawl".equals(actualCommand) && args.length >= 2) {
            if (!isValidUrl(args[1])) {
                view.printError("Invalid URL format: " + args[1]);
                return;
            }
        }

        command.execute(args, articles);
    }

    private boolean isValidUrl(String url) {
        if (url == null || url.isEmpty()) {
            return false;
        }
        return URL_PATTERN.matcher(url).matches();
    }
}