using System;
using System.Linq;
using System.Threading.Tasks;
using AutoFixture;
using AutoFixture.AutoMoq;
using Emby.Server.Implementations.QuickConnect;
using MediaBrowser.Common.Extensions;
using MediaBrowser.Controller.Authentication;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Net;
using MediaBrowser.Controller.QuickConnect;
using MediaBrowser.Model.Configuration;
using Moq;
using Xunit;

namespace Jellyfin.Server.Implementations.Tests.QuickConnect
{
    public class QuickConnectManagerTests
    {
        private static readonly AuthorizationInfo _quickConnectAuthInfo = new AuthorizationInfo
        {
            Device = "Device",
            DeviceId = "DeviceId",
            Client = "Client",
            Version = "1.0.0"
        };

        private readonly Fixture _fixture;
        private readonly ServerConfiguration _config;
        private readonly QuickConnectManager _quickConnectManager;

        public QuickConnectManagerTests()
        {
            _config = new ServerConfiguration();
            var configManager = new Mock<IServerConfigurationManager>();
            configManager.Setup(x => x.Configuration).Returns(_config);

            _fixture = new Fixture();
            _fixture.Customize(new AutoMoqCustomization
            {
                ConfigureMembers = true
            }).Inject(configManager.Object);

            _fixture.Inject<IQuickConnectStore>(new InMemoryQuickConnectStore());

            // User object contains circular references.
            _fixture.Behaviors.OfType<ThrowingRecursionBehavior>().ToList()
                .ForEach(b => _fixture.Behaviors.Remove(b));
            _fixture.Behaviors.Add(new OmitOnRecursionBehavior());

            _quickConnectManager = _fixture.Create<QuickConnectManager>();
        }

        [Fact]
        public void IsEnabled_QuickConnectUnavailable_False()
        {
            _config.QuickConnectAvailable = false;
            Assert.False(_quickConnectManager.IsEnabled);
        }

        [Theory]
        [InlineData("", "DeviceId", "Client", "1.0.0")]
        [InlineData("Device", "", "Client", "1.0.0")]
        [InlineData("Device", "DeviceId", "", "1.0.0")]
        [InlineData("Device", "DeviceId", "Client", "")]
        public async Task TryConnect_InvalidAuthorizationInfo_ThrowsArgumentException(string device, string deviceId, string client, string version)
            => await Assert.ThrowsAsync<ArgumentException>(() => _quickConnectManager.TryConnect(
                new AuthorizationInfo
                {
                    Device = device,
                    DeviceId = deviceId,
                    Client = client,
                    Version = version
                }));

        [Fact]
        public async Task TryConnect_QuickConnectUnavailable_ThrowsAuthenticationException()
        {
            _config.QuickConnectAvailable = false;
            await Assert.ThrowsAsync<AuthenticationException>(() => _quickConnectManager.TryConnect(_quickConnectAuthInfo));
        }

        [Fact]
        public async Task CheckRequestStatus_QuickConnectUnavailable_ThrowsAuthenticationException()
        {
            _config.QuickConnectAvailable = false;
            await Assert.ThrowsAsync<AuthenticationException>(() => _quickConnectManager.CheckRequestStatus(string.Empty));
        }

        [Fact]
        public async Task AuthorizeRequest_QuickConnectUnavailable_ThrowsAuthenticationException()
        {
            _config.QuickConnectAvailable = false;
            await Assert.ThrowsAsync<AuthenticationException>(() => _quickConnectManager.AuthorizeRequest(Guid.Empty, string.Empty));
        }

        [Fact]
        public async Task GetAuthorizedRequest_QuickConnectUnavailable_ThrowsAuthenticationException()
        {
            _config.QuickConnectAvailable = false;
            await Assert.ThrowsAsync<AuthenticationException>(() => _quickConnectManager.GetAuthorizedRequest(string.Empty));
        }

        [Fact]
        public void IsEnabled_QuickConnectAvailable_True()
        {
            _config.QuickConnectAvailable = true;
            Assert.True(_quickConnectManager.IsEnabled);
        }

        [Fact]
        public async Task CheckRequestStatus_QuickConnectAvailable_Success()
        {
            _config.QuickConnectAvailable = true;
            var res1 = await _quickConnectManager.TryConnect(_quickConnectAuthInfo);
            var res2 = await _quickConnectManager.CheckRequestStatus(res1.Secret);
            Assert.Equal(res1.Secret, res2.Secret);
            Assert.Equal(res1.Code, res2.Code);
        }

        [Fact]
        public async Task CheckRequestStatus_UnknownSecret_ThrowsResourceNotFoundException()
        {
            _config.QuickConnectAvailable = true;
            await Assert.ThrowsAsync<ResourceNotFoundException>(() => _quickConnectManager.CheckRequestStatus("Unknown secret"));
        }

        [Fact]
        public async Task GetAuthorizedRequest_UnknownSecret_ThrowsResourceNotFoundException()
        {
            _config.QuickConnectAvailable = true;
            await Assert.ThrowsAsync<ResourceNotFoundException>(() => _quickConnectManager.GetAuthorizedRequest("Unknown secret"));
        }

        [Fact]
        public async Task AuthorizeRequest_QuickConnectAvailable_Success()
        {
            _config.QuickConnectAvailable = true;
            var res = await _quickConnectManager.TryConnect(_quickConnectAuthInfo);
            Assert.True(await _quickConnectManager.AuthorizeRequest(Guid.Empty, res.Code));
        }

        [Fact]
        public async Task AuthorizeRequest_RacedOnOneCode_SucceedsOnce()
        {
            _config.QuickConnectAvailable = true;
            var res = await _quickConnectManager.TryConnect(_quickConnectAuthInfo);

            var outcomes = await Task.WhenAll(
                Task.Run(() => AuthorizeAsync(res.Code)),
                Task.Run(() => AuthorizeAsync(res.Code)));

            Assert.Single(outcomes, authorized => authorized);
        }

        [Fact]
        public async Task GetAuthorizedRequest_SecondExchange_ReturnsTheSameResult()
        {
            _config.QuickConnectAvailable = true;
            var res = await _quickConnectManager.TryConnect(_quickConnectAuthInfo);
            await _quickConnectManager.AuthorizeRequest(Guid.Empty, res.Code);

            var first = await _quickConnectManager.GetAuthorizedRequest(res.Secret);
            var second = await _quickConnectManager.GetAuthorizedRequest(res.Secret);

            Assert.Same(first, second);
        }

        [Fact]
        public async Task AuthorizeRequest_OfAnAuthorizedRequest_ThrowsConflictException()
        {
            _config.QuickConnectAvailable = true;
            var res = await _quickConnectManager.TryConnect(_quickConnectAuthInfo);
            await _quickConnectManager.AuthorizeRequest(Guid.Empty, res.Code);

            await Assert.ThrowsAsync<ConflictException>(() => _quickConnectManager.AuthorizeRequest(Guid.Empty, res.Code));
        }

        private async Task<bool> AuthorizeAsync(string code)
        {
            try
            {
                return await _quickConnectManager.AuthorizeRequest(Guid.Empty, code).ConfigureAwait(false);
            }
            catch (ConflictException)
            {
                return false;
            }
        }
    }
}