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package cn.ipokerface.aps.utils;

import io.netty.channel.EventLoopGroup;
import io.netty.channel.socket.DatagramChannel;
import io.netty.channel.socket.SocketChannel;

import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

public class ClientChannelClassUtil {

    private static final Map SOCKET_CHANNEL_CLASSES = new HashMap<>();
    private static final Map DATAGRAM_CHANNEL_CLASSES = new HashMap<>();

    static {
        SOCKET_CHANNEL_CLASSES.put("io.netty.channel.nio.NioEventLoopGroup", "io.netty.channel.socket.nio.NioSocketChannel");
        SOCKET_CHANNEL_CLASSES.put("io.netty.channel.epoll.EpollEventLoopGroup", "io.netty.channel.epoll.EpollSocketChannel");
        SOCKET_CHANNEL_CLASSES.put("io.netty.channel.kqueue.KQueueEventLoopGroup", "io.netty.channel.kqueue.KQueueSocketChannel");

        DATAGRAM_CHANNEL_CLASSES.put("io.netty.channel.nio.NioEventLoopGroup", "io.netty.channel.socket.nio.NioDatagramChannel");
        DATAGRAM_CHANNEL_CLASSES.put("io.netty.channel.epoll.EpollEventLoopGroup", "io.netty.channel.epoll.EpollDatagramChannel");
        DATAGRAM_CHANNEL_CLASSES.put("io.netty.channel.kqueue.KQueueEventLoopGroup", "io.netty.channel.kqueue.KQueueDatagramChannel");
    }

    /**
     * Returns a socket channel class suitable for specified event loop group.
     *
     * @param eventLoopGroup the event loop group for which to identify an appropriate socket channel class; must not
     * be {@code null}
     *
     * @return a socket channel class suitable for use with the given event loop group
     *
     * @throws IllegalArgumentException in case of null or unrecognized event loop group
     */
    public static Class getSocketChannelClass(final EventLoopGroup eventLoopGroup) {
        Objects.requireNonNull(eventLoopGroup);

        final String socketChannelClassName = SOCKET_CHANNEL_CLASSES.get(eventLoopGroup.getClass().getName());

        if (socketChannelClassName == null) {
            throw new IllegalArgumentException("No socket channel class found for event loop group type: " + eventLoopGroup.getClass().getName());
        }

        try {
            return Class.forName(socketChannelClassName).asSubclass(SocketChannel.class);
        } catch (final ClassNotFoundException e) {
            throw new IllegalArgumentException(e);
        }
    }

    /**
     * Returns a datagram channel class suitable for specified event loop group.
     *
     * @param eventLoopGroup the event loop group for which to identify an appropriate datagram channel class; must not
     * be {@code null}
     *
     * @return a datagram channel class suitable for use with the given event loop group
     *
     * @throws IllegalArgumentException in case of null or unrecognized event loop group
     */
    public static Class getDatagramChannelClass(final EventLoopGroup eventLoopGroup) {
        Objects.requireNonNull(eventLoopGroup);

        final String datagramChannelClassName = DATAGRAM_CHANNEL_CLASSES.get(eventLoopGroup.getClass().getName());

        if (datagramChannelClassName == null) {
            throw new IllegalArgumentException("No datagram channel class found for event loop group type: " + eventLoopGroup.getClass().getName());
        }

        try {
            return Class.forName(datagramChannelClassName).asSubclass(DatagramChannel.class);
        } catch (final ClassNotFoundException e) {
            throw new IllegalArgumentException(e);
        }
    }
}