// 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.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 NegotiateReservesConnectionIdAndReturnsIt()
        {
            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 = "/negotiate";
            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);
        }

        [Theory]
        [InlineData("/send")]
        [InlineData("/sse")]
        [InlineData("/poll")]
        [InlineData("/ws")]
        public async Task EndpointsThatAcceptConnectionId404WhenUnknownConnectionIdProvided(string path)
        {
            var manager = new ConnectionManager();
            var dispatcher = new HttpConnectionDispatcher(manager, new LoggerFactory());

            using (var strm = new MemoryStream())
            {
                var context = new DefaultHttpContext();
                context.Response.Body = strm;

                var services = new ServiceCollection();
                services.AddSingleton<TestEndPoint>();
                context.RequestServices = services.BuildServiceProvider();
                context.Request.Path = path;
                var values = new Dictionary<string, StringValues>();
                values["id"] = "unknown";
                var qs = new QueryCollection(values);
                context.Request.Query = qs;

                await dispatcher.ExecuteAsync<TestEndPoint>("", context);

                Assert.Equal(StatusCodes.Status404NotFound, context.Response.StatusCode);
                await strm.FlushAsync();
                Assert.Equal("No Connection with that ID", Encoding.UTF8.GetString(strm.ToArray()));
            }
        }

        [Theory]
        [InlineData("/send")]
        [InlineData("/sse")]
        [InlineData("/poll")]
        public async Task EndpointsThatRequireConnectionId400WhenNoConnectionIdProvided(string path)
        {
            var manager = new ConnectionManager();
            var dispatcher = new HttpConnectionDispatcher(manager, new LoggerFactory());
            using (var strm = new MemoryStream())
            {
                var context = new DefaultHttpContext();
                context.Response.Body = strm;
                var services = new ServiceCollection();
                services.AddSingleton<TestEndPoint>();
                context.RequestServices = services.BuildServiceProvider();
                context.Request.Path = path;

                await dispatcher.ExecuteAsync<TestEndPoint>("", context);

                Assert.Equal(StatusCodes.Status400BadRequest, context.Response.StatusCode);
                await strm.FlushAsync();
                Assert.Equal("Connection ID required", Encoding.UTF8.GetString(strm.ToArray()));
            }
        }
    }

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