package clientserver;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.InetSocketAddress;

public class ClientHandler {

    static void main(String[] args) {
        int port = 6666;
        boolean running = true;
        DatagramSocket socketServer = null;

        while (running) {
            try {
                // 1 - Création du canal
                socketServer = new DatagramSocket(null);
                // 2 - Réservation du port
                InetSocketAddress address = new InetSocketAddress(
                    "localhost",
                    port
                );
                socketServer.bind(address);
                // 3 - Recevoir
                byte[] recues = new byte[1024]; // tampon de réception
                DatagramPacket receivedPacket = new DatagramPacket(
                    recues,
                    recues.length
                );

                socketServer.receive(receivedPacket);

                Thread thread = new Thread(() -> createThread(receivedPacket));
                thread.start();
            } catch (Exception e) {
                System.err.println(e);
            }
        }

        socketServer.close();
    }

    public static void createThread(DatagramPacket packet) {
        try {
            InetAddress clientAddress = packet.getAddress();
            int clientPort = packet.getPort();
            System.out.println(
                "Nouveau client : @" + clientAddress + ":" + clientPort
            );
            DatagramSocket socket = new DatagramSocket(); // Reserve new port

            String response = "PORT:" + socket.getLocalPort();
            byte[] envoyees; // tampon d'émission
            envoyees = response.getBytes();
            DatagramPacket packetToSend = new DatagramPacket(
                envoyees,
                envoyees.length,
                clientAddress,
                clientPort
            );
            socket.send(packetToSend);
        } catch (Exception e) {
            System.err.println(e);
        }
    }

    static void scannerUDP(int startPort, int endPort) {
        try {
            for (int i = startPort; i < endPort; i++) {
                try (DatagramSocket socket = new DatagramSocket(i)) {} catch (
                    Exception e
                ) {
                    System.out.println("Port n°" + i + " déjà occupé");
                }
            }
        } catch (Exception e) {
            System.out.println(e);
        }
    }
    // public static void main(String[] args) {
    //     try {
    //         // 1 - Création du canal
    //         DatagramSocket socketServeur = new DatagramSocket(null);
    //         // 2 - Réservation du port
    //         InetSocketAddress adresse = new InetSocketAddress(
    //             "localhost",
    //             6666
    //         );
    //         socketServeur.bind(adresse);
    //         byte[] recues = new byte[1024]; // tampon d'émission
    //         byte[] envoyees; // tampon de réception
    //         // 3 - Recevoir
    //         DatagramPacket paquetRecu = new DatagramPacket(
    //             recues,
    //             recues.length
    //         );
    //         socketServeur.receive(paquetRecu);
    //         InetAddress adrClient = paquetRecu.getAddress();
    //         int prtClient = paquetRecu.getPort();
    //         System.out.println(
    //             "Nouveau client : @" + adrClient + ":" + prtClient
    //         );
    //         // 4 - Émettre
    //         String reponse = "Serveur RX302 ready";
    //         envoyees = reponse.getBytes();
    //         DatagramPacket paquetEnvoye = new DatagramPacket(
    //             envoyees,
    //             envoyees.length,
    //             adrClient,
    //             prtClient
    //         );
    //         socketServeur.send(paquetEnvoye);
    //         // 5 - Libérer le canal
    //         socketServeur.close();
    //     } catch (Exception e) {
    //         System.err.println(e);
    //     }
    // }
}