package com.nokia.esb_socket.service;

import java.nio.charset.StandardCharsets;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;

import javax.annotation.PreDestroy;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.nokia.esb_socket.pojo.TousuSheet;
import com.nokia.esb_socket.service.handler.AuthHandler;
import com.nokia.esb_socket.service.handler.HeartbeatHandler;
import com.nokia.esb_socket.service.handler.MessagePrintHandler;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.handler.timeout.IdleStateHandler;
import lombok.extern.slf4j.Slf4j;

/**
 * 投诉驱动建设socket接口
 */
@Slf4j
@Service
public class EsbNettyService {

    @Value("${toususheet.host}")
    private String host;
    @Value("${toususheet.port}")
    private int port;
    @Value("${toususheet.userName}")
    private String userName;
    @Value("${toususheet.password}")
    private String password;
    private final ObjectMapper objectMapper;
    private final EventLoopGroup group;
    private Channel channel = null;

    @Autowired
    public EsbNettyService(ObjectMapper objectMapper) {
        this.objectMapper = objectMapper;
        // 线程资源在实例初始化时建立
        group = new NioEventLoopGroup(1);
    }

    /**
     * 发送消息
     * 
     * @param tousuSheet
     */
    public void send(TousuSheet tousuSheet) {
        if (channel == null || !channel.isActive()) {
            // 连接异常
            log.info("准备连接到服务器...");
            connect();
        }
        try {
            String msg = objectMapper.writeValueAsString(tousuSheet);
            synchronized (channel) {
                channel.writeAndFlush("<AlarmStart>\r\n" + msg + "\r\n<AlarmEnd>\r\n");
            }
        } catch (JsonProcessingException e) {
            e.printStackTrace();
            log.error("发送失败--{}", e.getMessage());
        }
    }

    /**
     * 建立连接
     */
    synchronized public void connect() {
        CompletableFuture<Boolean> future = new CompletableFuture<>();
        Bootstrap bootstrap = new Bootstrap();
        bootstrap.group(group)
                .channel(NioSocketChannel.class)
                .option(ChannelOption.SO_KEEPALIVE, true)
                .handler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    protected void initChannel(SocketChannel socketChannel) throws Exception {
                        socketChannel.pipeline()
                                .addLast(new StringEncoder(StandardCharsets.UTF_8))
                                .addLast(new IdleStateHandler(0, 60, 0))
                                .addLast(new HeartbeatHandler())
                                .addLast(new StringDecoder(StandardCharsets.UTF_8))
                                .addLast(new MessagePrintHandler())
                                .addLast(new AuthHandler(userName, password, future));
                    }
                });
        try {
            ChannelFuture channelFuture = bootstrap.connect(host, port).sync();
            // 建立
            channel = channelFuture.channel();
            Boolean flag = future.get();
            if (flag) {
                log.info("通道已激活, 鉴权已通过...");
            } else {
                disconnect();
                throw new RuntimeException("鉴权失败,已断开连接...");
            }
        } catch (InterruptedException | ExecutionException e) {
            e.printStackTrace();
        }
    }

    /**
     * 释放连接
     */
    synchronized public void disconnect() {
        if (channel != null) {
            try {
                channel.closeFuture().sync();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            channel = null;
        }
    }

    /**
     * 由spring框架控制自动释放资源
     * 
     * @throws InterruptedException
     */
    @PreDestroy
    public void tearDown() throws InterruptedException {
        group.shutdownGracefully().sync();
    }
}