#region Copyright notice and license

// Copyright 2015, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#endregion

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

using CommandLine;
using CommandLine.Text;
using Grpc.Core;
using Grpc.Core.Logging;
using Grpc.Core.Utils;
using Grpc.Testing;
using NUnit.Framework;

namespace Grpc.IntegrationTesting
{
    public class QpsWorker
    {
        private class ServerOptions
        {
            [Option("driver_port", Default = 0)]
            public int DriverPort { get; set; }
        }

        ServerOptions options;

        private QpsWorker(ServerOptions options)
        {
            this.options = options;
        }

        public static void Run(string[] args)
        {
            GrpcEnvironment.SetLogger(new ConsoleLogger());
            var parserResult = Parser.Default.ParseArguments<ServerOptions>(args)
                .WithNotParsed((x) => Environment.Exit(1))
                .WithParsed(options =>
                {
                    var workerServer = new QpsWorker(options);
                    workerServer.RunAsync().Wait();
                });
        }

        private async Task RunAsync()
        {
            // (ThreadPoolSize == ProcessorCount) gives best throughput in benchmarks
            // and doesn't seem to harm performance even when server and client
            // are running on the same machine.
            GrpcEnvironment.SetThreadPoolSize(Environment.ProcessorCount);

            string host = "0.0.0.0";
            int port = options.DriverPort;

            var tcs = new TaskCompletionSource<object>();
            var workerServiceImpl = new WorkerServiceImpl(() => { Task.Run(() => tcs.SetResult(null)); });
                
            var server = new Server
            {
                Services = { WorkerService.BindService(workerServiceImpl) },
                Ports = { new ServerPort(host, options.DriverPort, ServerCredentials.Insecure )}
            };
            int boundPort = server.Ports.Single().BoundPort;
            GrpcEnvironment.Logger.Info("Running qps worker server on {0}:{1}", host, boundPort);
            server.Start();
            await tcs.Task;
            await server.ShutdownAsync();

            GrpcEnvironment.Logger.Info("GC collection counts (after shutdown): gen0 {0}, gen1 {1}, gen2 {2}, gen3 {3}",
                GC.CollectionCount(0), GC.CollectionCount(1), GC.CollectionCount(2), GC.CollectionCount(3));
        }
    }
}