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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License") + you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under
 * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package org.red5.io.sctp;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.net.SocketException;
import java.nio.channels.spi.SelectorProvider;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
import java.util.Random;
import java.util.Set;
import java.util.UUID;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

import org.red5.io.sctp.IAssociationControl.State;
import org.red5.io.sctp.packet.SctpPacket;

public class SctpServerChanneOverUDP extends SctpServerChannel implements IServerChannelControl {

    private final static Logger logger = Logger.getLogger(Logger.GLOBAL_LOGGER_NAME);

    private static final String MAC_ALGORITHM_NAME = "HmacSHA256";

    private static final int BUFFER_SIZE = 2048;

    private byte[] buffer = new byte[BUFFER_SIZE];

    private DatagramSocket serverSocket;

    private HashMap pendingAssociations;

    private int maxNumberOfPendingChannels;

    private Random random = new Random();

    private final Mac messageAuthenticationCode;

    protected SctpServerChanneOverUDP(SelectorProvider provider) throws NoSuchAlgorithmException, InvalidKeyException {
        super(provider);
        SecretKeySpec secretKey = new SecretKeySpec(UUID.randomUUID().toString().getBytes(), MAC_ALGORITHM_NAME);
        messageAuthenticationCode = Mac.getInstance(MAC_ALGORITHM_NAME);
        messageAuthenticationCode.init(secretKey);
    }

    @Override
    public SctpChannel accept() throws IOException, SctpException, InvalidKeyException, NoSuchAlgorithmException {
        logger.setLevel(Level.INFO);

        DatagramPacket receivePacket = new DatagramPacket(buffer, buffer.length);
        SctpPacket packet = null;
        while (true) {
            serverSocket.receive(receivePacket);
            try {
                packet = new SctpPacket(buffer, 0, receivePacket.getLength());
            } catch (SctpException e) {
                logger.log(Level.WARNING, e.getMessage());
                continue;
            }

            logger.log(Level.INFO, "receive new packet");

            InetSocketAddress address = new InetSocketAddress(receivePacket.getAddress(), receivePacket.getPort());
            packet.apply(address, this);

            Association association = pendingAssociations.get(address);
            if (association != null && association.getState() == State.ESTABLISHED) {
                return new SctpChannel(association);
            }
        }
    }

    @Override
    public SctpServerChannel bind(SocketAddress local, int backlog) throws IOException {
        maxNumberOfPendingChannels = backlog + 1;
        pendingAssociations = new HashMap<>();
        if (serverSocket == null) {
            serverSocket = new DatagramSocket(local);
        } else {
            throw new IOException("already bound");
        }
        return this;
    }

    @Override
    public Mac getMac() {
        return messageAuthenticationCode;
    }

    @Override
    public boolean addPendingChannel(InetSocketAddress address, int initialTSN, int verificationTag) throws SocketException {
        if (pendingAssociations.size() < maxNumberOfPendingChannels) {
            Association channel = new Association(random, address, initialTSN, verificationTag);
            pendingAssociations.put(address, channel);
            return true;
        }

        return false;
    }

    @Override
    public IAssociationControl getPendingChannel(InetSocketAddress address) {
        return pendingAssociations.get(address);
    }

    @Override
    public int getPort() {
        return serverSocket.getLocalPort();
    }

    @Override
    public void send(SctpPacket packet, InetSocketAddress address) throws IOException {
        byte[] data = packet.getBytes();
        serverSocket.send(new DatagramPacket(data, data.length, address));
    }

    @Override
    public Random getRandom() {
        return random;
    }

    @Override
    public void removePendingChannel(InetSocketAddress address) {
        // TODO Auto-generated method stub
    }

    @Override
    public SctpServerChannel bindAddress(InetAddress address) throws IOException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Set getAllLocalAddresses() throws IOException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    protected void implCloseSelectableChannel() throws IOException {
        // TODO Auto-generated method stub
    }

    @Override
    protected void implConfigureBlocking(boolean block) throws IOException {
        // TODO Auto-generated method stub
    }

    @Override
    public SctpServerChannel unbindAddress(InetAddress address) throws IOException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public  SctpServerChannel setOption(SctpSocketOption name, T value) throws IOException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Set> supportedOptions() {
        // TODO Auto-generated method stub
        return null;
    }
}