// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Pipelines;
using System.Text;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Internal;
using Microsoft.AspNetCore.Sockets.Internal;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Primitives;
using Xunit;

namespace Microsoft.AspNetCore.Sockets.Tests
{
    public class HttpConnectionDispatcherTests
    {
        [Fact]
        public async Task GetIdReservesConnectionIdAndReturnsIt()
        {
            var manager = new ConnectionManager();
            var dispatcher = new HttpConnectionDispatcher(manager, new LoggerFactory());
            var context = new DefaultHttpContext();
            var services = new ServiceCollection();
            services.AddSingleton<TestEndPoint>();
            context.RequestServices = services.BuildServiceProvider();
            var ms = new MemoryStream();
            context.Request.Path = "/getid";
            context.Response.Body = ms;
            await dispatcher.ExecuteAsync<TestEndPoint>("", context);

            var id = Encoding.UTF8.GetString(ms.ToArray());

            ConnectionState state;
            Assert.True(manager.TryGetConnection(id, out state));
            Assert.Equal(id, state.Connection.ConnectionId);
        }

        [Fact]
        public async Task SendingToUnknownConnectionIdThrows()
        {
            var manager = new ConnectionManager();
            var dispatcher = new HttpConnectionDispatcher(manager, new LoggerFactory());
            var context = new DefaultHttpContext();
            var services = new ServiceCollection();
            services.AddSingleton<TestEndPoint>();
            context.RequestServices = services.BuildServiceProvider();
            context.Request.Path = "/send";
            var values = new Dictionary<string, StringValues>();
            values["id"] = "unknown";
            var qs = new QueryCollection(values);
            context.Request.Query = qs;
            await Assert.ThrowsAsync<InvalidOperationException>(async () =>
            {
                await dispatcher.ExecuteAsync<TestEndPoint>("", context);
            });
        }

        [Fact]
        public async Task SendingWithoutConnectionIdThrows()
        {

            var manager = new ConnectionManager();
            var dispatcher = new HttpConnectionDispatcher(manager, new LoggerFactory());
            var context = new DefaultHttpContext();
            var services = new ServiceCollection();
            services.AddSingleton<TestEndPoint>();
            context.RequestServices = services.BuildServiceProvider();
            context.Request.Path = "/send";
            await Assert.ThrowsAsync<InvalidOperationException>(async () =>
            {
                await dispatcher.ExecuteAsync<TestEndPoint>("", context);
            });
        }
    }

    public class TestEndPoint : EndPoint
    {
        public override Task OnConnectedAsync(Connection connection)
        {
            throw new NotImplementedException();
        }
    }
}