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package org.lumongo.server.connection;

import com.google.protobuf.RpcCallback;
import com.google.protobuf.RpcController;
import com.googlecode.protobuf.pro.duplex.PeerInfo;
import com.googlecode.protobuf.pro.duplex.execute.RpcServerCallExecutor;
import com.googlecode.protobuf.pro.duplex.execute.NonInterruptingThreadPoolCallExecutor;
import com.googlecode.protobuf.pro.duplex.server.DuplexTcpServerPipelineFactory;
import com.googlecode.protobuf.pro.duplex.util.RenamingThreadFactoryProxy;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelOption;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import org.apache.log4j.Logger;
import org.lumongo.cluster.message.Lumongo;
import org.lumongo.cluster.message.Lumongo.ClearRequest;
import org.lumongo.cluster.message.Lumongo.ClearResponse;
import org.lumongo.cluster.message.Lumongo.DeleteRequest;
import org.lumongo.cluster.message.Lumongo.DeleteResponse;
import org.lumongo.cluster.message.Lumongo.GetFieldNamesRequest;
import org.lumongo.cluster.message.Lumongo.GetFieldNamesResponse;
import org.lumongo.cluster.message.Lumongo.GetNumberOfDocsRequest;
import org.lumongo.cluster.message.Lumongo.GetNumberOfDocsResponse;
import org.lumongo.cluster.message.Lumongo.GetTermsRequest;
import org.lumongo.cluster.message.Lumongo.GetTermsResponse;
import org.lumongo.cluster.message.Lumongo.InternalQueryResponse;
import org.lumongo.cluster.message.Lumongo.InternalService;
import org.lumongo.cluster.message.Lumongo.OptimizeRequest;
import org.lumongo.cluster.message.Lumongo.OptimizeResponse;
import org.lumongo.cluster.message.Lumongo.QueryRequest;
import org.lumongo.cluster.message.Lumongo.StoreRequest;
import org.lumongo.cluster.message.Lumongo.StoreResponse;
import org.lumongo.server.config.ClusterConfig;
import org.lumongo.server.config.LocalNodeConfig;
import org.lumongo.server.index.LumongoIndexManager;

import java.util.Collection;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

public class InternalServiceHandler extends InternalService {

	private final static Logger log = Logger.getLogger(InternalServiceHandler.class);
	
	private final LumongoIndexManager indexManager;
	private final ClusterConfig clusterConfig;
	private final LocalNodeConfig localNodeConfig;
	
	private ServerBootstrap bootstrap;
	
	public InternalServiceHandler(ClusterConfig clusterConfig, LocalNodeConfig localNodeConfig, LumongoIndexManager indexManager) {
		this.clusterConfig = clusterConfig;
		this.localNodeConfig = localNodeConfig;
		this.indexManager = indexManager;
		
	}
	
	public void start() {
		int internalServicePort = localNodeConfig.getInternalServicePort();
		
		PeerInfo internalServerInfo = new PeerInfo(ConnectionHelper.getHostName(), internalServicePort);
		int coreInternalWorkers = clusterConfig.getInternalWorkers();
		int maxInternalWorkers = coreInternalWorkers * 64; //TODO why?
		
		RpcServerCallExecutor executor = new NonInterruptingThreadPoolCallExecutor(coreInternalWorkers, maxInternalWorkers, new RenamingThreadFactoryProxy(
						InternalService.class.getSimpleName() + "-" + localNodeConfig.getHazelcastPort() + "-Rpc", Executors.defaultThreadFactory()));
		
		DuplexTcpServerPipelineFactory serverFactory = new DuplexTcpServerPipelineFactory(internalServerInfo);
		serverFactory.setRpcServerCallExecutor(executor);
		
		bootstrap = new ServerBootstrap();
		bootstrap.group(new NioEventLoopGroup(0, new RenamingThreadFactoryProxy(InternalService.class.getSimpleName() + "-"
										+ localNodeConfig.getHazelcastPort() + "-Boss", Executors.defaultThreadFactory())),
						new NioEventLoopGroup(0, new RenamingThreadFactoryProxy(InternalService.class.getSimpleName() + "-"
										+ localNodeConfig.getHazelcastPort() + "-Worker", Executors.defaultThreadFactory())));
		bootstrap.channel(NioServerSocketChannel.class);
		bootstrap.childHandler(serverFactory);
		
		//TODO think about these options
		bootstrap.option(ChannelOption.SO_SNDBUF, 1048576);
		bootstrap.option(ChannelOption.SO_RCVBUF, 1048576);
		bootstrap.childOption(ChannelOption.SO_RCVBUF, 1048576);
		bootstrap.childOption(ChannelOption.SO_SNDBUF, 1048576);
		bootstrap.option(ChannelOption.TCP_NODELAY, true);
		
		bootstrap.localAddress(internalServicePort);
		
		serverFactory.setLogger(null);
		serverFactory.registerConnectionEventListener(new StandardConnectionNotifier(log));
		
		serverFactory.getRpcServiceRegistry().registerService(this);
		
		bootstrap.bind();
	}
	
	public void shutdown() {
		
		log.info("Starting internal service shutdown");
		bootstrap.group().shutdownGracefully(1, clusterConfig.getInternalShutdownTimeout(), TimeUnit.SECONDS);
		
		try {
			bootstrap.group().terminationFuture().sync();
		}
		catch (Exception e) {
			log.info("Failed to stop external service within " + clusterConfig.getInternalShutdownTimeout() + "ms: " + e);
		}
		
	}
	
	@Override
	public void query(RpcController controller, QueryRequest request, RpcCallback done) {
		try {
			InternalQueryResponse r = indexManager.internalQuery(request);
			done.run(r);
		}
		catch (Exception e) {
			log.error("Failed to run internal query: <" + request + ">: " + e.getClass().getSimpleName() + ": ", e);
			controller.setFailed(e.getClass().getSimpleName() + ":" + e.getMessage());
			done.run(null);
		}
	}
	
	@Override
	public void store(RpcController controller, StoreRequest request, RpcCallback done) {
		try {
			StoreResponse r = indexManager.storeInternal(request);
			done.run(r);
		}
		catch (Exception e) {
			log.error("Failed to run internal store: <" + request + ">: " + e.getClass().getSimpleName() + ": ", e);
			controller.setFailed(e.getClass().getSimpleName() + ":" + e.getMessage());
			done.run(null);
		}
	}

	@Override
	public void fetch(RpcController controller, Lumongo.FetchRequest request, RpcCallback done) {
		try {
			Lumongo.FetchResponse r = indexManager.internalFetch(request);
			done.run(r);
		}
		catch (Exception e) {
			log.error("Failed to run internal fetch: <" + request + ">: " + e.getClass().getSimpleName() + ": ", e);
			controller.setFailed(e.getClass().getSimpleName() + ":" + e.getMessage());
			done.run(null);
		}
	}

	@Override
	public void delete(RpcController controller, DeleteRequest request, RpcCallback done) {
		try {
			DeleteResponse r = indexManager.internalDeleteDocument(request);
			done.run(r);
		}
		catch (Exception e) {
			log.error("Failed to run internal delete: <" + request + ">: " + e.getClass().getSimpleName() + ": ", e);
			controller.setFailed(e.getClass().getSimpleName() + ":" + e.getMessage());
			done.run(null);
		}
	}
	
	@Override
	public void getNumberOfDocs(RpcController controller, GetNumberOfDocsRequest request, RpcCallback done) {
		try {
			GetNumberOfDocsResponse r = indexManager.getNumberOfDocsInternal(request);
			done.run(r);
		}
		catch (Exception e) {
			log.error("Failed to run get number of docs: <" + request + ">: " + e.getClass().getSimpleName() + ": ", e);
			controller.setFailed(e.getClass().getSimpleName() + ":" + e.getMessage());
			done.run(null);
		}
	}
	
	@Override
	public void clear(RpcController controller, ClearRequest request, RpcCallback done) {
		try {
			ClearResponse r = indexManager.clearInternal(request);
			done.run(r);
		}
		catch (Exception e) {
			log.error("Failed to clear index: <" + request + ">: " + e.getClass().getSimpleName() + ": ", e);
			controller.setFailed(e.getClass().getSimpleName() + ":" + e.getMessage());
			done.run(null);
		}
	}
	
	@Override
	public void optimize(RpcController controller, OptimizeRequest request, RpcCallback done) {
		try {
			OptimizeResponse r = indexManager.optimizeInternal(request);
			done.run(r);
		}
		catch (Exception e) {
			log.error("Failed to optimized index: <" + request + ">: " + e.getClass().getSimpleName() + ": ", e);
			controller.setFailed(e.getClass().getSimpleName() + ":" + e.getMessage());
			done.run(null);
		}
	}
	
	@Override
	public void getFieldNames(RpcController controller, GetFieldNamesRequest request, RpcCallback done) {
		try {
			GetFieldNamesResponse r = indexManager.getFieldNamesInternal(request);
			done.run(r);
		}
		catch (Exception e) {
			log.error("Failed to get field names: <" + request + ">: " + e.getClass().getSimpleName() + ": ", e);
			controller.setFailed(e.getClass().getSimpleName() + ":" + e.getMessage());
			done.run(null);
		}
	}
	
	@Override
	public void getTerms(RpcController controller, GetTermsRequest request, RpcCallback done) {
		try {
			Lumongo.GetTermsResponseInternal r = indexManager.getTermsInternal(request);
			done.run(r);
		}
		catch (Exception e) {
			log.error("Failed to get terms: <" + request + ">: " + e.getClass().getSimpleName() + ": ", e);
			controller.setFailed(e.getClass().getSimpleName() + ":" + e.getMessage());
			done.run(null);
		}
	}
	
}