/*
 * ============LICENSE_START=======================================================
 *  Copyright (C) 2019 Nordix Foundation.
 *  ================================================================================
 *  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.
 *
 *  SPDX-License-Identifier: Apache-2.0
 *  ============LICENSE_END=========================================================
 */

package org.onap.so;

import io.grpc.ServerBuilder;
import io.grpc.stub.StreamObserver;
import io.grpc.testing.GrpcCleanupRule;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicReference;
import javax.annotation.PostConstruct;
import org.junit.Rule;
import org.onap.ccsdk.cds.controllerblueprints.common.api.EventType;
import org.onap.ccsdk.cds.controllerblueprints.common.api.Status;
import org.onap.ccsdk.cds.controllerblueprints.processing.api.BluePrintProcessingServiceGrpc.BluePrintProcessingServiceImplBase;
import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceInput;
import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceOutput;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class GrpcNettyServer extends BluePrintProcessingServiceImplBase {

    private static final Logger logger = LoggerFactory.getLogger(GrpcNettyServer.class);

    @Value("${cds.endpoint}")
    private String host;

    @Value("${cds.port}")
    private String port;

    @Rule
    public final GrpcCleanupRule grpcCleanup = new GrpcCleanupRule();

    private final List<String> messagesDelivered = new ArrayList<>();
    private final CountDownLatch allRequestsDelivered = new CountDownLatch(1);
    private final AtomicReference<StreamObserver<ExecutionServiceOutput>> responseObserverRef = new AtomicReference<>();

    @PostConstruct
    public void start() throws IOException {

        final BluePrintProcessingServiceImplBase blueprintPrcessorImpl =
            new BluePrintProcessingServiceImplBase() {
                @Override
                public StreamObserver<ExecutionServiceInput> process(
                    StreamObserver<ExecutionServiceOutput> responseObserver) {

                    responseObserverRef.set(responseObserver);

                    StreamObserver<ExecutionServiceInput> requestObserver = new StreamObserver<ExecutionServiceInput>() {
                        @Override
                        public void onNext(ExecutionServiceInput message) {
                            messagesDelivered.add(message.getActionIdentifiers().getActionName());
                            logger.info("Message received: {}", message);
                            ExecutionServiceOutput executionServiceOutput = ExecutionServiceOutput.newBuilder()
                                .setActionIdentifiers(message.getActionIdentifiers())
                                .setStatus(Status.newBuilder().setEventType(
                                    EventType.EVENT_COMPONENT_EXECUTED).build()).build();

                            responseObserverRef.get().onNext(executionServiceOutput);
                            logger.info("Message sent: {}", executionServiceOutput);
                        }

                        @Override
                        public void onError(Throwable t) {
                            responseObserverRef.get().onError(t);
                        }

                        @Override
                        public void onCompleted() {
                            allRequestsDelivered.countDown();
                            responseObserverRef.get().onCompleted();
                        }
                    };

                    return requestObserver;
                }
            };
        grpcCleanup.register(
            ServerBuilder.forPort(Integer.valueOf(port)).directExecutor().addService(blueprintPrcessorImpl).build()
                .start());

    }

    public List<String> getMessagesDelivered() {
        return this.messagesDelivered;
    }

}