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/*
 * Copyright 2015 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.glowroot.agent.init;

import java.io.IOException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import org.glowroot.agent.shaded.google.common.util.concurrent.ThreadFactoryBuilder;
import org.glowroot.agent.shaded.grpc.Server;
import org.glowroot.agent.shaded.grpc.netty.NettyServerBuilder;
import org.glowroot.agent.shaded.grpc.stub.StreamObserver;
import org.glowroot.agent.shaded.netty.channel.EventLoopGroup;

import org.glowroot.wire.api.Collector;
import org.glowroot.wire.api.model.CollectorServiceGrpc;
import org.glowroot.wire.api.model.CollectorServiceGrpc.CollectorService;
import org.glowroot.wire.api.model.CollectorServiceOuterClass.AggregateMessage;
import org.glowroot.wire.api.model.CollectorServiceOuterClass.ConfigMessage;
import org.glowroot.wire.api.model.CollectorServiceOuterClass.EmptyMessage;
import org.glowroot.wire.api.model.CollectorServiceOuterClass.GaugeValueMessage;
import org.glowroot.wire.api.model.CollectorServiceOuterClass.Hello;
import org.glowroot.wire.api.model.CollectorServiceOuterClass.JvmInfoMessage;
import org.glowroot.wire.api.model.CollectorServiceOuterClass.LogMessage;
import org.glowroot.wire.api.model.CollectorServiceOuterClass.TraceMessage;

import static java.util.concurrent.TimeUnit.SECONDS;

// this exists to hide shading from integration test harness
public class GrpcServerWrapper {

    private final EventLoopGroup bossEventLoopGroup;
    private final EventLoopGroup workerEventLoopGroup;
    private final ExecutorService executor;
    private final Server server;

    public GrpcServerWrapper(Collector collector, int port) throws IOException {
        bossEventLoopGroup = EventLoopGroups.create("Glowroot-grpc-boss-ELG");
        workerEventLoopGroup = EventLoopGroups.create("Glowroot-grpc-worker-ELG");
        executor = Executors.newCachedThreadPool(
                new ThreadFactoryBuilder()
                        .setDaemon(true)
                        .setNameFormat("Glowroot-grpc-executor-%d")
                        .build());
        server = NettyServerBuilder.forPort(port)
                .bossEventLoopGroup(bossEventLoopGroup)
                .workerEventLoopGroup(workerEventLoopGroup)
                .executor(executor)
                .addService(CollectorServiceGrpc.bindService(new CollectorServiceImpl(collector)))
                .build()
                .start();
    }

    public void close() throws InterruptedException {
        server.shutdown();
        if (!server.awaitTermination(10, SECONDS)) {
            throw new IllegalStateException("Could not terminate gRPC channel");
        }
        executor.shutdown();
        if (!executor.awaitTermination(10, SECONDS)) {
            throw new IllegalStateException("Could not terminate gRPC executor");
        }
        if (!bossEventLoopGroup.shutdownGracefully(0, 0, SECONDS).await(10, SECONDS)) {
            throw new IllegalStateException("Could not terminate gRPC boss event loop group");
        }
        if (!workerEventLoopGroup.shutdownGracefully(0, 0, SECONDS).await(10, SECONDS)) {
            throw new IllegalStateException("Could not terminate gRPC worker event loop group");
        }
    }

    private static class CollectorServiceImpl implements CollectorService {

        private final Collector collector;

        private CollectorServiceImpl(Collector collector) {
            this.collector = collector;
        }

        @Override
        public void hello(Hello request, StreamObserver responseObserver) {
            responseObserver.onNext(EmptyMessage.getDefaultInstance());
            responseObserver.onCompleted();
        }

        @Override
        public void collectConfig(ConfigMessage request,
                StreamObserver responseObserver) {
            responseObserver.onNext(EmptyMessage.getDefaultInstance());
            responseObserver.onCompleted();
        }

        @Override
        public void collectJvmInfo(JvmInfoMessage request,
                StreamObserver responseObserver) {
            responseObserver.onNext(EmptyMessage.getDefaultInstance());
            responseObserver.onCompleted();
        }

        @Override
        public void collectAggregates(AggregateMessage request,
                StreamObserver responseObserver) {
            try {
                collector.collectAggregates(request.getCaptureTime(),
                        request.getOverallAggregateList(),
                        request.getTransactionAggregateList());
            } catch (Throwable t) {
                responseObserver.onError(t);
                return;
            }
            responseObserver.onNext(EmptyMessage.getDefaultInstance());
            responseObserver.onCompleted();
        }

        @Override
        public void collectGaugeValues(GaugeValueMessage request,
                StreamObserver responseObserver) {
            try {
                collector.collectGaugeValues(request.getGaugeValuesList());
            } catch (Throwable t) {
                responseObserver.onError(t);
                return;
            }
            responseObserver.onNext(EmptyMessage.getDefaultInstance());
            responseObserver.onCompleted();
        }

        @Override
        public void collectTrace(TraceMessage request,
                StreamObserver responseObserver) {
            try {
                collector.collectTrace(request.getTrace());
            } catch (Throwable t) {
                responseObserver.onError(t);
                return;
            }
            responseObserver.onNext(EmptyMessage.getDefaultInstance());
            responseObserver.onCompleted();
        }

        @Override
        public void log(LogMessage request, StreamObserver responseObserver) {
            try {
                collector.log(request.getLogEvent());
            } catch (Throwable t) {
                responseObserver.onError(t);
                return;
            }
            responseObserver.onNext(EmptyMessage.getDefaultInstance());
            responseObserver.onCompleted();
        }
    }
}