// ------------------------------------------------------------------------
// Copyright 2021 The Dapr 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.
// ------------------------------------------------------------------------

using System;
using System.Threading;
using System.Threading.Tasks;
using Dapr.Client;
using Google.Protobuf.WellKnownTypes;
using Grpc.Core;
using Xunit;
using Xunit.Abstractions;

namespace Dapr.E2E.Test
{
    public class GrpcProxyTests : DaprTestAppLifecycle
    {
        // Grpc proxying requires a specific setup so we can't use the built-in standard for the E2ETest partial class.
        public GrpcProxyTests(ITestOutputHelper output, DaprTestAppFixture fixture) : base(output, fixture)
        {
            AppContext.SetSwitch("System.Net.Http.SocketsHttpHandler.Http2UnencryptedSupport", true);
            base.Configuration = new DaprRunConfiguration 
            {
                UseAppPort = true,
                AppId = "grpcapp",
                AppProtocol = "grpc",
                TargetProject = "./../../../../../test/Dapr.E2E.Test.App.Grpc/Dapr.E2E.Test.App.Grpc.csproj",
            };
        }

        [Fact]
        public async Task TestGrpcProxyMessageSendAndReceive()
        {
            using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(20));
            var invoker = DaprClient.CreateInvocationInvoker(appId: this.AppId, daprEndpoint: this.GrpcEndpoint);
            var client = new Messager.MessagerClient(invoker);

            await client.SendMessageAsync(new SendMessageRequest { Recipient = "Client", Message = "Hello"}, cancellationToken: cts.Token);

            var response = await client.GetMessageAsync(new GetMessageRequest { Recipient = "Client" }, cancellationToken: cts.Token);

            Assert.Equal("Hello", response.Message);
        }

        [Fact]
        public async Task TestGrpcProxyStreamingBroadcast()
        {
            using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(20));
            var invoker = DaprClient.CreateInvocationInvoker(appId: this.AppId, daprEndpoint: this.GrpcEndpoint);
            var client = new Messager.MessagerClient(invoker);

            var messageCount = 10;
            var messageReceived = 0;
            using (var call = client.StreamBroadcast(cancellationToken: cts.Token)) {
                var responseTask = Task.Run(async () =>
                {
                    await foreach (var response in call.ResponseStream.ReadAllAsync())
                    {
                        Assert.Equal($"Hello: {messageReceived++}", response.Message);
                    }
                });

                for (var i = 0; i < messageCount; i++)
                {
                    await call.RequestStream.WriteAsync(new Broadcast { Message = $"Hello: {i}" });
                }
                await call.RequestStream.CompleteAsync();

                await responseTask;
            }
        }

        [Fact]
        public async Task TestGrpcServiceInvocationWithTimeout()
        {
            using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(20));
            var invoker = DaprClient.CreateInvocationInvoker(appId: this.AppId, daprEndpoint: this.GrpcEndpoint);
            var client = new Messager.MessagerClient(invoker);

            var options = new CallOptions(cancellationToken: cts.Token, deadline: DateTime.UtcNow.AddSeconds(1));
            var ex = await Assert.ThrowsAsync<RpcException>(async () =>
                {
                    await client.DelayedResponseAsync(new Empty(), options);
                });

            Assert.Equal(StatusCode.DeadlineExceeded, ex.StatusCode);
        }
    }
}