package com.crawler.command;

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

public class CommandController {
    private List<Command> commands;
    private Scanner scanner;
    private CommandHistory history;

    public CommandController() {
        commands = new ArrayList<>();
        scanner = new Scanner(System.in);
        history = CommandHistory.getInstance();
        initCommands();
    }

    private void initCommands() {
        HelpCommand helpCmd = new HelpCommand(commands);
        commands.add(helpCmd);
        commands.add(new ListCommand());
        commands.add(new CrawlCommand());
        commands.add(new CacheCommand());
        commands.add(new ExitCommand());
    }

    public void start() {
        System.out.println("========================================");
        System.out.println("Java爬虫框架 - 命令行模式");
        System.out.println("========================================");
        System.out.println("输入 'help' 查看可用指令");
        System.out.println("========================================");

        while (true) {
            System.out.print("> ");
            String input = scanner.nextLine().trim().toLowerCase();

            if (input.isEmpty()) {
                continue;
            }

            history.add(input);
            executeCommand(input);
        }
    }

    private void executeCommand(String commandName) {
        for (Command cmd : commands) {
            if (cmd.getName().equals(commandName)) {
                cmd.execute();
                return;
            }
        }

        System.out.println("未知指令: " + commandName);
        System.out.println("输入 'help' 查看可用指令");
    }

    public void stop() {
        scanner.close();
    }
}