#region Copyright notice and license

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// 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.
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// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
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#endregion

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using Google.ProtocolBuffers;
using grpc.testing;
using Grpc.Core;
using Grpc.Core.Utils;
using NUnit.Framework;

namespace Grpc.IntegrationTesting
{
    public class InteropClient
    {
        private class ClientOptions
        {
            public bool help;
            public string serverHost = "127.0.0.1";
            public string serverHostOverride = TestCredentials.DefaultHostOverride;
            public int? serverPort;
            public string testCase = "large_unary";
            public bool useTls;
            public bool useTestCa;
        }

        ClientOptions options;

        private InteropClient(ClientOptions options)
        {
            this.options = options;
        }

        public static void Run(string[] args)
        {
            Console.WriteLine("gRPC C# interop testing client");
            ClientOptions options = ParseArguments(args);

            if (options.serverHost == null || !options.serverPort.HasValue || options.testCase == null)
            {
                Console.WriteLine("Missing required argument.");
                Console.WriteLine();
                options.help = true;
            }

            if (options.help)
            {
                Console.WriteLine("Usage:");
                Console.WriteLine("  --server_host=HOSTNAME");
                Console.WriteLine("  --server_host_override=HOSTNAME");
                Console.WriteLine("  --server_port=PORT");
                Console.WriteLine("  --test_case=TESTCASE");
                Console.WriteLine("  --use_tls=BOOLEAN");
                Console.WriteLine("  --use_test_ca=BOOLEAN");
                Console.WriteLine();
                Environment.Exit(1);
            }

            var interopClient = new InteropClient(options);
            interopClient.Run();
        }

        private void Run()
        {
            GrpcEnvironment.Initialize();

            string addr = string.Format("{0}:{1}", options.serverHost, options.serverPort);

            Credentials credentials = null;
            if (options.useTls)
            {
                credentials = TestCredentials.CreateTestClientCredentials(options.useTestCa);
            }

            ChannelArgs channelArgs = null;
            if (!string.IsNullOrEmpty(options.serverHostOverride))
            {
                channelArgs = ChannelArgs.CreateBuilder()
                    .AddString(ChannelArgs.SslTargetNameOverrideKey, options.serverHostOverride).Build();
            }

            using (Channel channel = new Channel(addr, credentials, channelArgs))
            {
                TestServiceGrpc.ITestServiceClient client = new TestServiceGrpc.TestServiceClientStub(channel);
                RunTestCase(options.testCase, client);
            }

            GrpcEnvironment.Shutdown();
        }

        private void RunTestCase(string testCase, TestServiceGrpc.ITestServiceClient client)
        {
            switch (testCase)
            {
                case "empty_unary":
                    RunEmptyUnary(client);
                    break;
                case "large_unary":
                    RunLargeUnary(client);
                    break;
                case "client_streaming":
                    RunClientStreaming(client);
                    break;
                case "server_streaming":
                    RunServerStreaming(client);
                    break;
                case "ping_pong":
                    RunPingPong(client);
                    break;
                case "empty_stream":
                    RunEmptyStream(client);
                    break;
                case "benchmark_empty_unary":
                    RunBenchmarkEmptyUnary(client);
                    break;
                default:
                    throw new ArgumentException("Unknown test case " + testCase);
            }
        }

        public static void RunEmptyUnary(TestServiceGrpc.ITestServiceClient client)
        {
            Console.WriteLine("running empty_unary");
            var response = client.EmptyCall(Empty.DefaultInstance);
            Assert.IsNotNull(response);
            Console.WriteLine("Passed!");
        }

        public static void RunLargeUnary(TestServiceGrpc.ITestServiceClient client)
        {
            Console.WriteLine("running large_unary");
            var request = SimpleRequest.CreateBuilder()
                    .SetResponseType(PayloadType.COMPRESSABLE)
                    .SetResponseSize(314159)
                    .SetPayload(CreateZerosPayload(271828))
                    .Build();

            var response = client.UnaryCall(request);

            Assert.AreEqual(PayloadType.COMPRESSABLE, response.Payload.Type);
            Assert.AreEqual(314159, response.Payload.Body.Length);
            Console.WriteLine("Passed!");
        }

        public static void RunClientStreaming(TestServiceGrpc.ITestServiceClient client)
        {
            Console.WriteLine("running client_streaming");

            var bodySizes = new List<int> { 27182, 8, 1828, 45904 };

            var context = client.StreamingInputCall();
            foreach (var size in bodySizes)
            {
                context.Inputs.OnNext(
                    StreamingInputCallRequest.CreateBuilder().SetPayload(CreateZerosPayload(size)).Build());
            }
            context.Inputs.OnCompleted();

            var response = context.Task.Result;
            Assert.AreEqual(74922, response.AggregatedPayloadSize);
            Console.WriteLine("Passed!");
        }

        public static void RunServerStreaming(TestServiceGrpc.ITestServiceClient client)
        {
            Console.WriteLine("running server_streaming");

            var bodySizes = new List<int> { 31415, 9, 2653, 58979 };

            var request = StreamingOutputCallRequest.CreateBuilder()
                .SetResponseType(PayloadType.COMPRESSABLE)
                .AddRangeResponseParameters(bodySizes.ConvertAll(
                        (size) => ResponseParameters.CreateBuilder().SetSize(size).Build()))
                .Build();

            var recorder = new RecordingObserver<StreamingOutputCallResponse>();
            client.StreamingOutputCall(request, recorder);

            var responseList = recorder.ToList().Result;

            foreach (var res in responseList)
            {
                Assert.AreEqual(PayloadType.COMPRESSABLE, res.Payload.Type);
            }
            CollectionAssert.AreEqual(bodySizes, responseList.ConvertAll((item) => item.Payload.Body.Length));
            Console.WriteLine("Passed!");
        }

        public static void RunPingPong(TestServiceGrpc.ITestServiceClient client)
        {
            Console.WriteLine("running ping_pong");

            var recorder = new RecordingQueue<StreamingOutputCallResponse>();
            var inputs = client.FullDuplexCall(recorder);

            StreamingOutputCallResponse response;

            inputs.OnNext(StreamingOutputCallRequest.CreateBuilder()
                .SetResponseType(PayloadType.COMPRESSABLE)
                .AddResponseParameters(ResponseParameters.CreateBuilder().SetSize(31415))
                .SetPayload(CreateZerosPayload(27182)).Build());

            response = recorder.Queue.Take();
            Assert.AreEqual(PayloadType.COMPRESSABLE, response.Payload.Type);
            Assert.AreEqual(31415, response.Payload.Body.Length);

            inputs.OnNext(StreamingOutputCallRequest.CreateBuilder()
                          .SetResponseType(PayloadType.COMPRESSABLE)
                          .AddResponseParameters(ResponseParameters.CreateBuilder().SetSize(9))
                          .SetPayload(CreateZerosPayload(8)).Build());

            response = recorder.Queue.Take();
            Assert.AreEqual(PayloadType.COMPRESSABLE, response.Payload.Type);
            Assert.AreEqual(9, response.Payload.Body.Length);

            inputs.OnNext(StreamingOutputCallRequest.CreateBuilder()
                          .SetResponseType(PayloadType.COMPRESSABLE)
                          .AddResponseParameters(ResponseParameters.CreateBuilder().SetSize(2653))
                          .SetPayload(CreateZerosPayload(1828)).Build());

            response = recorder.Queue.Take();
            Assert.AreEqual(PayloadType.COMPRESSABLE, response.Payload.Type);
            Assert.AreEqual(2653, response.Payload.Body.Length);

            inputs.OnNext(StreamingOutputCallRequest.CreateBuilder()
                          .SetResponseType(PayloadType.COMPRESSABLE)
                          .AddResponseParameters(ResponseParameters.CreateBuilder().SetSize(58979))
                          .SetPayload(CreateZerosPayload(45904)).Build());

            response = recorder.Queue.Take();
            Assert.AreEqual(PayloadType.COMPRESSABLE, response.Payload.Type);
            Assert.AreEqual(58979, response.Payload.Body.Length);

            inputs.OnCompleted();

            recorder.Finished.Wait();
            Assert.AreEqual(0, recorder.Queue.Count);

            Console.WriteLine("Passed!");
        }

        public static void RunEmptyStream(TestServiceGrpc.ITestServiceClient client)
        {
            Console.WriteLine("running empty_stream");

            var recorder = new RecordingObserver<StreamingOutputCallResponse>();
            var inputs = client.FullDuplexCall(recorder);
            inputs.OnCompleted();

            var responseList = recorder.ToList().Result;
            Assert.AreEqual(0, responseList.Count);

            Console.WriteLine("Passed!");
        }

        // This is not an official interop test, but it's useful.
        public static void RunBenchmarkEmptyUnary(TestServiceGrpc.ITestServiceClient client)
        {
            BenchmarkUtil.RunBenchmark(10000, 10000,
                                       () => { client.EmptyCall(Empty.DefaultInstance); });
        }

        private static Payload CreateZerosPayload(int size)
        {
            return Payload.CreateBuilder().SetBody(ByteString.CopyFrom(new byte[size])).Build();
        }

        private static ClientOptions ParseArguments(string[] args)
        {
            var options = new ClientOptions();
            foreach (string arg in args)
            {
                ParseArgument(arg, options);
                if (options.help)
                {
                    break;
                }
            }
            return options;
        }

        private static void ParseArgument(string arg, ClientOptions options)
        {
            Match match;
            match = Regex.Match(arg, "--server_host=(.*)");
            if (match.Success)
            {
                options.serverHost = match.Groups[1].Value.Trim();
                return;
            }

            match = Regex.Match(arg, "--server_host_override=(.*)");
            if (match.Success)
            {
                options.serverHostOverride = match.Groups[1].Value.Trim();
                return;
            }

            match = Regex.Match(arg, "--server_port=(.*)");
            if (match.Success)
            {
                options.serverPort = int.Parse(match.Groups[1].Value.Trim());
                return;
            }

            match = Regex.Match(arg, "--test_case=(.*)");
            if (match.Success)
            {
                options.testCase = match.Groups[1].Value.Trim();
                return;
            }

            match = Regex.Match(arg, "--use_tls=(.*)");
            if (match.Success)
            {
                options.useTls = bool.Parse(match.Groups[1].Value.Trim());
                return;
            }

            match = Regex.Match(arg, "--use_test_ca=(.*)");
            if (match.Success)
            {
                options.useTestCa = bool.Parse(match.Groups[1].Value.Trim());
                return;
            }

            Console.WriteLine(string.Format("Unrecognized argument \"{0}\"", arg));
            options.help = true;
        }
    }
}