package cn.com.taiji.beidou.server;

import cn.com.taiji.beidou.handler.WebSocketHandler;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.codec.serialization.ObjectEncoder;
import io.netty.handler.stream.ChunkedWriteHandler;
import io.netty.handler.timeout.IdleStateHandler;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import java.net.InetSocketAddress;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;


/**
 * @author wudskq
 */
@Slf4j
@Component
public class NettyServer {

    /**
     * webSocket协议名
     */
    private static final String WEBSOCKET_PROTOCOL = "WebSocket";

    /**
     * 端口号
     */
    @Value("${webSocket.netty.port}")
    private int port;

    /**
     * webSocket路径
     */
    @Value("${webSocket.netty.path}")
    private String webSocketPath;

    /**
     * 在Netty心跳检测中配置 - 读空闲超时时间设置
     */
    @Value("${webSocket.netty.readerIdleTime}")
    private long readerIdleTime;

    /**
     * 在Netty心跳检测中配置 - 写空闲超时时间设置
     */
    @Value("${webSocket.netty.writerIdleTime}")
    private long writerIdleTime;

    /**
     * 在Netty心跳检测中配置 - 读写空闲超时时间设置
     */
    @Value("${webSocket.netty.allIdleTime}")
    private long allIdleTime;

    @Autowired
    private WebSocketHandler webSocketHandler;

    private EventLoopGroup bossGroup;

    private EventLoopGroup workGroup;


    private static final ThreadFactory threadFactory = new ThreadFactoryBuilder().setNameFormat("thread-pool-netty-ws1").build();

    /**
     * 启动
     * @throws InterruptedException
     */
    private void start() throws InterruptedException {
        bossGroup = new NioEventLoopGroup();
        workGroup = new NioEventLoopGroup();
        ServerBootstrap bootstrap = new ServerBootstrap();
        bootstrap.group(bossGroup,workGroup);
        bootstrap.channel(NioServerSocketChannel.class);
        // 设置监听端口
        bootstrap.localAddress(new InetSocketAddress(port));
        bootstrap.childHandler(new ChannelInitializer<SocketChannel>() {

            @Override
            protected void initChannel(SocketChannel ch) throws Exception {
                ch.pipeline().addLast(new IdleStateHandler(readerIdleTime, writerIdleTime, allIdleTime, TimeUnit.MINUTES));
                // webSocket协议本身是基于http协议的，使用http编解码器
                ch.pipeline().addLast(new HttpServerCodec());
                ch.pipeline().addLast(new ObjectEncoder());
                ch.pipeline().addLast(new ChunkedWriteHandler());
                ch.pipeline().addLast(new HttpObjectAggregator(8192));
                ch.pipeline().addLast(new WebSocketServerProtocolHandler(webSocketPath, WEBSOCKET_PROTOCOL, true, 65536 * 10));
                // 自定义的handler，处理业务逻辑
                ch.pipeline().addLast(webSocketHandler);
            }
        });
        ChannelFuture channelFuture = bootstrap.bind().sync();
        log.info("Server started and listen on:{}",channelFuture.channel().localAddress());
        channelFuture.channel().closeFuture().sync();
    }

    /**
     * 释放资源
     * @throws InterruptedException
     */
    @PreDestroy
    public void destroy() throws InterruptedException {
        if(bossGroup != null){
            bossGroup.shutdownGracefully().sync();
        }
        if(workGroup != null){
            workGroup.shutdownGracefully().sync();
        }
    }

    /**
     * 使用线程池初始化netty-websocket服务
     */
    ThreadPoolExecutor threadPoolExecutor  = new ThreadPoolExecutor(2,2,5,
            TimeUnit.MINUTES,new ArrayBlockingQueue<>(10),threadFactory,new ThreadPoolExecutor.AbortPolicy());

    /**
     * 初始化(新线程开启)
     */
    @PostConstruct()
    public void init() {
        threadPoolExecutor.execute(new Runnable() {
            @Override
            public void run() {
                try {
                    start();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}