package netty;

import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.util.concurrent.GlobalEventExecutor;

/**
 * description
 *
 * @author jack
 * @since 2018/7/31 下午1:10
 */
public class SimpleChatServerHandler extends SimpleChannelInboundHandler<String> {

    public static ChannelGroup channels = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);


    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();
        channels.write("[Server]-" + channel.remoteAddress() + "加入群组");
        channels.add(channel);
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();
        channels.write("[Server]-" + channel.remoteAddress() + "断开了");
    }


    @Override
    protected void channelRead0(ChannelHandlerContext channelHandlerContext, String s) throws Exception {
        Channel incoming = channelHandlerContext.channel();
        channels.forEach(channel -> {
            if (channel != incoming) {
                channel.writeAndFlush("[" + incoming.remoteAddress() + "]" + s + "\n");
            } else {
                channel.writeAndFlush("[you]" + s + "\n");
            }
        });

    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();
        System.out.println("SimpleChatClient:" + channel.remoteAddress() + "在线");
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception { // (6)
        Channel incoming = ctx.channel();
        System.out.println("SimpleChatClient:" + incoming.remoteAddress() + "掉线");
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        Channel incoming = ctx.channel();
        System.out.println("SimpleChatClient:" + incoming.remoteAddress() + "异常");
        // 当出现异常就关闭连接
        cause.printStackTrace();
        ctx.close();
    }
}