package com.xxl.job.core.server;

import com.xxl.job.core.biz.ExecutorBiz;
import com.xxl.job.core.biz.impl.ExecutorBizImpl;
import com.xxl.job.core.biz.model.LogParam;
import com.xxl.job.core.biz.model.ReturnT;
import com.xxl.job.core.biz.model.TriggerParam;
import com.xxl.job.core.thread.ExecutorRegistryThread;
import com.xxl.job.core.util.GsonTool;
import com.xxl.job.core.util.XxlJobRemotingUtil;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.*;
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.*;
import io.netty.handler.timeout.IdleStateEvent;
import io.netty.handler.timeout.IdleStateHandler;
import io.netty.util.CharsetUtil;
import io.netty.util.internal.ThrowableUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.TimeUnit;

/**
 * Copy from : https://github.com/xuxueli/xxl-rpc
 *
 * @author xuxueli 2020-04-11 21:25
 */
public class EmbedServer {
    private static final Logger logger = LoggerFactory.getLogger(EmbedServer.class);

    private ExecutorBiz executorBiz;
    private Thread thread;

    public void start(final String address, final int port, final String appName, final String accessToken) {
        executorBiz = new ExecutorBizImpl();
        thread = new Thread(new Runnable() {

            @Override
            public void run() {

                // param
                EventLoopGroup bossGroup = new NioEventLoopGroup();
                EventLoopGroup workerGroup = new NioEventLoopGroup();

                try {
                    // start server
                    ServerBootstrap bootstrap = new ServerBootstrap();
                    bootstrap.group(bossGroup, workerGroup)
                            .channel(NioServerSocketChannel.class)
                            .childHandler(new ChannelInitializer<SocketChannel>() {
                                @Override
                                public void initChannel(SocketChannel channel) throws Exception {
                                    channel.pipeline()
                                            .addLast(new IdleStateHandler(0, 0, 30 * 3, TimeUnit.SECONDS))  // beat 3N, close if idle
                                            .addLast(new HttpServerCodec())
                                            .addLast(new HttpObjectAggregator(5 * 1024 * 1024))  // merge request & reponse to FULL
                                            .addLast(new EmbedHttpServerHandler(executorBiz, accessToken));
                                }
                            })
                            .childOption(ChannelOption.SO_KEEPALIVE, true);

                    // bind
                    ChannelFuture future = bootstrap.bind(port).sync();

                    logger.info(">>>>>>>>>>> xxl-job remoting server start success, nettype = {}, port = {}", EmbedServer.class, port);

                    // start registry
                    startRegistry(appName, address);

                    // wait util stop
                    future.channel().closeFuture().sync();

                } catch (InterruptedException e) {
                    if (e instanceof InterruptedException) {
                        logger.info(">>>>>>>>>>> xxl-job remoting server stop.");
                    } else {
                        logger.error(">>>>>>>>>>> xxl-job remoting server error.", e);
                    }
                } finally {
                    // stop
                    try {
                        workerGroup.shutdownGracefully();
                        bossGroup.shutdownGracefully();
                    } catch (Exception e) {
                        logger.error(e.getMessage(), e);
                    }
                }

            }

        });
        thread.setDaemon(true);	// daemon, service jvm, user thread leave >>> daemon leave >>> jvm leave
        thread.start();
    }

    public void stop() throws Exception {
        // destroy server thread
        if (thread!=null && thread.isAlive()) {
            thread.interrupt();
        }

        // stop registry
        stopRegistry();
        logger.info(">>>>>>>>>>> xxl-job remoting server destroy success.");
    }


    // ---------------------- registry ----------------------

    /**
     * netty_http
     *
     * Copy from : https://github.com/xuxueli/xxl-rpc
     *
     * @author xuxueli 2015-11-24 22:25:15
     */
    public static class EmbedHttpServerHandler extends SimpleChannelInboundHandler<FullHttpRequest> {
        private static final Logger logger = LoggerFactory.getLogger(EmbedHttpServerHandler.class);

        private ExecutorBiz executorBiz;
        private String accessToken;
        public EmbedHttpServerHandler(ExecutorBiz executorBiz, String accessToken) {
            this.executorBiz = executorBiz;
            this.accessToken = accessToken;
        }

        @Override
        protected void channelRead0(final ChannelHandlerContext ctx, FullHttpRequest msg) throws Exception {

            // request parse
            //final byte[] requestBytes = ByteBufUtil.getBytes(msg.content());    // byteBuf.toString(io.netty.util.CharsetUtil.UTF_8);
            String requestData = msg.content().toString(CharsetUtil.UTF_8);
            String uri = msg.uri();
            HttpMethod httpMethod = msg.method();
            boolean keepAlive = HttpUtil.isKeepAlive(msg);
            String accessTokenReq = msg.headers().get(XxlJobRemotingUtil.XXL_JOB_ACCESS_TOKEN);

            // do invoke
            Object responseObj = process(httpMethod, uri, requestData, accessTokenReq);

            // to json
            String responseJson = GsonTool.toJson(responseObj);

            // write response
            writeResponse(ctx, keepAlive, responseJson);
        }

        private Object process(HttpMethod httpMethod, String uri, String requestData, String accessTokenReq) {

            // valid
            if (HttpMethod.POST != httpMethod) {
                return new ReturnT<String>(ReturnT.FAIL_CODE, "invalid request, HttpMethod not support.");
            }
            if (uri==null || uri.trim().length()==0) {
                return new ReturnT<String>(ReturnT.FAIL_CODE, "invalid request, uri-mapping empty.");
            }
            if (accessToken!=null
                    && accessToken.trim().length()>0
                    && !accessToken.equals(accessTokenReq)) {
                return new ReturnT<String>(ReturnT.FAIL_CODE, "The access token is wrong.");
            }

            // services mapping
            try {
                if ("/beat".equals(uri)) {
                    return executorBiz.beat();
                } else if ("/idleBeat".equals(uri)) {
                    int jobId = GsonTool.fromJson(requestData, Integer.class);
                    return executorBiz.idleBeat(jobId);
                } else if ("/kill".equals(uri)) {
                    int jobId = GsonTool.fromJson(requestData, Integer.class);
                    return executorBiz.kill(jobId);
                } else if ("/log".equals(uri)) {
                    LogParam logParam = GsonTool.fromJson(requestData, LogParam.class);
                    return executorBiz.log(logParam);
                } else if ("/run".equals(uri)) {
                    TriggerParam triggerParam = GsonTool.fromJson(requestData, TriggerParam.class);
                    return executorBiz.run(triggerParam);
                }  else {
                    return new ReturnT<String>(ReturnT.FAIL_CODE, "invalid request, uri-mapping("+ uri +") not found.");
                }
            } catch (Exception e) {
                logger.error(e.getMessage(), e);
                return new ReturnT<String>(ReturnT.FAIL_CODE, "request error:" + ThrowableUtil.stackTraceToString(e));
            }
        }

        /**
         * write response
         */
        private void writeResponse(ChannelHandlerContext ctx, boolean keepAlive, String responseJson) {
            // write response
            FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, Unpooled.copiedBuffer(responseJson, CharsetUtil.UTF_8));   //  Unpooled.wrappedBuffer(responseJson)
            response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/html;charset=UTF-8");       // HttpHeaderValues.TEXT_PLAIN.toString()
            response.headers().set(HttpHeaderNames.CONTENT_LENGTH, response.content().readableBytes());
            if (keepAlive) {
                response.headers().set(HttpHeaderNames.CONNECTION, HttpHeaderValues.KEEP_ALIVE);
            }
            ctx.writeAndFlush(response);
        }

        @Override
        public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
            ctx.flush();
        }

        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
            logger.error(">>>>>>>>>>> xxl-job provider netty_http server caught exception", cause);
            ctx.close();
        }

        @Override
        public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
            if (evt instanceof IdleStateEvent) {
                ctx.channel().close();      // beat 3N, close if idle
                logger.debug(">>>>>>>>>>> xxl-job provider netty_http server close an idle channel.");
            } else {
                super.userEventTriggered(ctx, evt);
            }
        }
    }

    // ---------------------- registry ----------------------

    public void startRegistry(final String appName, final String address) {
        // start registry
        ExecutorRegistryThread.getInstance().start(appName, address);
    }

    public void stopRegistry() {
        // stop registry
        ExecutorRegistryThread.getInstance().toStop();
    }


}
