#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 NUnit.Framework;
using Google.GRPC.Core;
using Google.GRPC.Core.Internal;
using System.Threading;
using System.Diagnostics;
using System.Threading.Tasks;
using Google.GRPC.Core.Utils;

namespace Google.GRPC.Core.Tests
{
    public class ClientServerTest
    {
        string host = "localhost";

        Method<string, string> unaryEchoStringMethod = new Method<string, string>(
            MethodType.Unary,
            "/tests.Test/UnaryEchoString",
            Marshallers.StringMarshaller,
            Marshallers.StringMarshaller);

        [TestFixtureSetUp]
        public void Init()
        {
            GrpcEnvironment.Initialize();
        }

        [TestFixtureTearDown]
        public void Cleanup()
        {
            GrpcEnvironment.Shutdown();
        }

        [Test]
        public void UnaryCall()
        {
            Server server = new Server();
            server.AddServiceDefinition(
                ServerServiceDefinition.CreateBuilder("someService")
                    .AddMethod(unaryEchoStringMethod, HandleUnaryEchoString).Build());

            int port = server.AddPort(host + ":0");
            server.Start();

            using (Channel channel = new Channel(host + ":" + port))
            {
                var call = new Call<string, string>(unaryEchoStringMethod, channel);

                Assert.AreEqual("ABC", Calls.BlockingUnaryCall(call, "ABC", default(CancellationToken)));

                Assert.AreEqual("abcdef", Calls.BlockingUnaryCall(call, "abcdef", default(CancellationToken)));
            }

            server.ShutdownAsync().Wait();
        }

        [Test]
        public void UnaryCallPerformance()
        {
            Server server = new Server();
            server.AddServiceDefinition(
                ServerServiceDefinition.CreateBuilder("someService")
                .AddMethod(unaryEchoStringMethod, HandleUnaryEchoString).Build());

            int port = server.AddPort(host + ":0");
            server.Start();

            using (Channel channel = new Channel(host + ":" + port))
            {
                var call = new Call<string, string>(unaryEchoStringMethod, channel);

                var stopwatch = new Stopwatch();
                stopwatch.Start();
                for (int i = 0; i < 1000; i++)
                {
                    Calls.BlockingUnaryCall(call, "ABC", default(CancellationToken));
                }
                stopwatch.Stop();
                Console.WriteLine("Elapsed time: " + stopwatch.ElapsedMilliseconds + "ms");
            }

            server.ShutdownAsync().Wait();
        }

        [Test]
        public void UnknownMethodHandler()
        {
            Server server = new Server();
            server.AddServiceDefinition(
                ServerServiceDefinition.CreateBuilder("someService").Build());

            int port = server.AddPort(host + ":0");
            server.Start();

            using (Channel channel = new Channel(host + ":" + port))
            {
                var call = new Call<string, string>(unaryEchoStringMethod, channel);

                try {
                    Calls.BlockingUnaryCall(call, "ABC", default(CancellationToken));
                    Assert.Fail();
                } catch(RpcException e) {
                    Assert.AreEqual(StatusCode.GRPC_STATUS_UNIMPLEMENTED, e.Status.StatusCode);
                }
            }

            server.ShutdownAsync().Wait();
        }

        private void HandleUnaryEchoString(string request, IObserver<string> responseObserver)
        {
            responseObserver.OnNext(request);
            responseObserver.OnCompleted();
        }
    }
}