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#region Copyright notice and license

// Copyright 2015 gRPC 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.

#endregion

using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Google.Protobuf;
using Grpc.Core;
using Grpc.Core.Utils;
using Grpc.IntegrationTesting;

namespace Grpc.Testing
{
    /// <summary>
    /// Implementation of WorkerService server
    /// </summary>
    public class WorkerServiceImpl : WorkerService.WorkerServiceBase
    {
        readonly Action stopRequestHandler;

        public WorkerServiceImpl(Action stopRequestHandler)
        {
            this.stopRequestHandler = GrpcPreconditions.CheckNotNull(stopRequestHandler);
        }
        
        public override async Task RunServer(IAsyncStreamReader<ServerArgs> requestStream, IServerStreamWriter<ServerStatus> responseStream, ServerCallContext context)
        {
            GrpcPreconditions.CheckState(await requestStream.MoveNext());
            var serverConfig = requestStream.Current.Setup;
            var runner = ServerRunners.CreateStarted(serverConfig);

            await responseStream.WriteAsync(new ServerStatus
            {
                Stats = runner.GetStats(false),
                Port = runner.BoundPort,
                Cores = Environment.ProcessorCount,
            });
                
            while (await requestStream.MoveNext())
            {
                var reset = requestStream.Current.Mark.Reset;
                await responseStream.WriteAsync(new ServerStatus
                {
                    Stats = runner.GetStats(reset)
                });
            }
            await runner.StopAsync();
        }

        public override async Task RunClient(IAsyncStreamReader<ClientArgs> requestStream, IServerStreamWriter<ClientStatus> responseStream, ServerCallContext context)
        {
            GrpcPreconditions.CheckState(await requestStream.MoveNext());
            var clientConfig = requestStream.Current.Setup;
            var runner = ClientRunners.CreateStarted(clientConfig);

            await responseStream.WriteAsync(new ClientStatus
            {
                Stats = runner.GetStats(false)
            });

            while (await requestStream.MoveNext())
            {
                var reset = requestStream.Current.Mark.Reset;
                await responseStream.WriteAsync(new ClientStatus
                {
                    Stats = runner.GetStats(reset)
                });
            }
            await runner.StopAsync();
        }

        public override Task<CoreResponse> CoreCount(CoreRequest request, ServerCallContext context)
        {
            return Task.FromResult(new CoreResponse { Cores = Environment.ProcessorCount });
        }

        public override Task<Void> QuitWorker(Void request, ServerCallContext context)
        {
            stopRequestHandler();
            return Task.FromResult(new Void());
        }
    }
}