package cn.x47;


import cn.x47.config.Config;
import cn.x47.model.RIPEntry;
import cn.x47.model.RIPPacket;
import cn.x47.service.RIPClient;
import cn.x47.service.RIPServer;

import java.net.InetAddress;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.*;

public class RIPService {

    public static void main(String[] args) throws Exception {
        // 启动服务器
        RIPServer server = new RIPServer();
        new Thread(() -> {
            try {
                server.start();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }).start();

        // 启动客户端
        RIPClient client = new RIPClient();

        // 定期发送路由更新
        ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
        scheduler.scheduleAtFixedRate(() -> {
            RIPPacket packet = createRipResponsePacket(Config.RIP_VERSION);
            client.sendRipPacket(packet);
        }, 0, 30, TimeUnit.SECONDS);

//         主线程等待
        Thread.currentThread().join();
    }

    private static RIPPacket createRipResponsePacket(byte version) {
        List<RIPEntry> entries = new ArrayList<>();

        try {
            // 示例：添加本地路由条目
            InetAddress localAddress = InetAddress.getByName("192.168.100.0");
            InetAddress subnetMask = InetAddress.getByName("255.255.255.0");
            InetAddress nextHop = InetAddress.getByName("192.168.123.45");

            RIPEntry entry = new RIPEntry();
            entry.setAddressFamily((short) 2); // AF_INET
            entry.setIpAddress(localAddress);
            entry.setMetric(1);

            if (version == 2) {
                entry.setRouteTag((short) 0);
                entry.setSubnetMask(subnetMask);
                entry.setNextHop(nextHop);
            }

            entries.add(entry);

        } catch (Exception e) {
            e.printStackTrace();
        }

        return new RIPPacket((byte) 2, version, entries); // Command=2 (Response)
    }
}