// 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.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Connections;
using Microsoft.AspNetCore.SignalR.Internal.Protocol;
using Microsoft.Extensions.DependencyInjection;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
using Xunit;

namespace Microsoft.AspNetCore.SignalR.Client.Tests
{
    public class HubConnectionBuilderTests
    {
        [Fact]
        public void HubConnectionBuiderThrowsIfConnectionFactoryNotConfigured()
        {
            var ex = Assert.Throws<InvalidOperationException>(() => new HubConnectionBuilder().Build());
            Assert.Equal("Cannot create HubConnection instance. An IConnectionFactory was not configured.", ex.Message);
        }

        [Fact]
        public void AddJsonProtocolSetsHubProtocolToJsonWithDefaultOptions()
        {
            var serviceProvider = new HubConnectionBuilder().AddJsonProtocol().Services.BuildServiceProvider();

            var actualProtocol = Assert.IsType<JsonHubProtocol>(serviceProvider.GetService<IHubProtocol>());
            Assert.IsType<CamelCasePropertyNamesContractResolver>(actualProtocol.PayloadSerializer.ContractResolver);
        }

        [Fact]
        public void AddJsonProtocolSetsHubProtocolToJsonWithProvidedOptions()
        {
            var serviceProvider = new HubConnectionBuilder().AddJsonProtocol(options =>
            {
                options.PayloadSerializerSettings = new JsonSerializerSettings
                {
                    DateFormatString = "JUST A TEST"
                };
            }).Services.BuildServiceProvider();

            var actualProtocol = Assert.IsType<JsonHubProtocol>(serviceProvider.GetService<IHubProtocol>());
            Assert.Equal("JUST A TEST", actualProtocol.PayloadSerializer.DateFormatString);
        }

        [Fact]
        public async Task WithConnectionFactorySetsConnectionFactory()
        {
            var called = false;
            Func<TransferFormat, Task<ConnectionContext>> connectionFactory = format =>
            {
                called = true;
                return Task.FromResult<ConnectionContext>(null);
            };

            var serviceProvider = new HubConnectionBuilder().WithConnectionFactory(connectionFactory).Services.BuildServiceProvider();

            var factory = serviceProvider.GetService<IConnectionFactory>();
            Assert.NotNull(factory);
            Assert.False(called);
            await factory.ConnectAsync(TransferFormat.Text);
            Assert.True(called);
        }

        [Fact]
        public void BuildCanOnlyBeCalledOnce()
        {
            var builder = new HubConnectionBuilder().WithConnectionFactory(format => null);

            Assert.NotNull(builder.Build());

            var ex = Assert.Throws<InvalidOperationException>(() => builder.Build());
            Assert.Equal("HubConnectionBuilder allows creation only of a single instance of HubConnection.", ex.Message);
        }

        [Fact]
        public void AddMessagePackProtocolSetsHubProtocolToMsgPack()
        {
            var serviceProvider = new HubConnectionBuilder().AddMessagePackProtocol().Services.BuildServiceProvider();

            Assert.IsType<MessagePackHubProtocol>(serviceProvider.GetService<IHubProtocol>());
        }
    }
}