namespace Ocelot.AcceptanceTests
{
    using Microsoft.AspNetCore.Http;
    using Ocelot.Configuration.File;
    using Shouldly;
    using System;
    using System.Collections.Generic;
    using System.Net;
    using System.Net.Http;
    using System.Threading;
    using System.Threading.Tasks;
    using TestStack.BDDfy;
    using Xunit;

    public class HttpDelegatingHandlersTests : IDisposable
    {
        private readonly Steps _steps;
        private string _downstreamPath;
        private readonly ServiceHandler _serviceHandler;

        public HttpDelegatingHandlersTests()
        {
            _serviceHandler = new ServiceHandler();
            _steps = new Steps();
        }

        [Fact]
        public void should_call_re_route_ordered_specific_handlers()
        {
            var configuration = new FileConfiguration
            {
                ReRoutes = new List<FileReRoute>
                {
                    new FileReRoute
                    {
                        DownstreamPathTemplate = "/",
                        DownstreamScheme = "http",
                        DownstreamHostAndPorts = new List<FileHostAndPort>
                        {
                            new FileHostAndPort
                            {
                                Host = "localhost",
                                Port = 7197,
                            }
                        },
                        UpstreamPathTemplate = "/",
                        UpstreamHttpMethod = new List<string> { "Get" },
                        DelegatingHandlers = new List<string>
                        {
                            "FakeHandlerTwo",
                            "FakeHandler"
                        }
                    }
                }
            };

            this.Given(x => x.GivenThereIsAServiceRunningOn("http://localhost:7197", "/", 200, "Hello from Laura"))
                .And(x => _steps.GivenThereIsAConfiguration(configuration))
                .And(x => _steps.GivenOcelotIsRunningWithSpecficHandlersRegisteredInDi<FakeHandler, FakeHandlerTwo>())
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
                .And(x => _steps.ThenTheResponseBodyShouldBe("Hello from Laura"))
                .And(x => ThenTheOrderedHandlersAreCalledCorrectly())
                .BDDfy();
        }

        [Fact]
        public void should_call_global_di_handlers()
        {
            var configuration = new FileConfiguration
            {
                ReRoutes = new List<FileReRoute>
                {
                    new FileReRoute
                    {
                        DownstreamPathTemplate = "/",
                        DownstreamScheme = "http",
                        DownstreamHostAndPorts = new List<FileHostAndPort>
                        {
                            new FileHostAndPort
                            {
                                Host = "localhost",
                                Port = 7187,
                            }
                        },
                        UpstreamPathTemplate = "/",
                        UpstreamHttpMethod = new List<string> { "Get" },
                    }
                }
            };

            this.Given(x => x.GivenThereIsAServiceRunningOn("http://localhost:7187", "/", 200, "Hello from Laura"))
                .And(x => _steps.GivenThereIsAConfiguration(configuration))
                .And(x => _steps.GivenOcelotIsRunningWithGlobalHandlersRegisteredInDi<FakeHandler, FakeHandlerTwo>())
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
                .And(x => _steps.ThenTheResponseBodyShouldBe("Hello from Laura"))
                .And(x => ThenTheHandlersAreCalledCorrectly())
                .BDDfy();
        }

        [Fact]
        public void should_call_global_di_handlers_multiple_times()
        {
            var configuration = new FileConfiguration
            {
                ReRoutes = new List<FileReRoute>
                {
                    new FileReRoute
                    {
                        DownstreamPathTemplate = "/",
                        DownstreamScheme = "http",
                        DownstreamHostAndPorts = new List<FileHostAndPort>
                        {
                            new FileHostAndPort
                            {
                                Host = "localhost",
                                Port = 9187,
                            }
                        },
                        UpstreamPathTemplate = "/",
                        UpstreamHttpMethod = new List<string> { "Get" },
                    }
                }
            };

            this.Given(x => x.GivenThereIsAServiceRunningOn("http://localhost:9187", "/", 200, "Hello from Laura"))
                .And(x => _steps.GivenThereIsAConfiguration(configuration))
                .And(x => _steps.GivenOcelotIsRunningWithGlobalHandlerRegisteredInDi<FakeHandlerAgain>())
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
                .And(x => _steps.ThenTheResponseBodyShouldBe("Hello from Laura"))
                .BDDfy();
        }

        [Fact]
        public void should_call_global_di_handlers_with_dependency()
        {
            var configuration = new FileConfiguration
            {
                ReRoutes = new List<FileReRoute>
                {
                    new FileReRoute
                    {
                        DownstreamPathTemplate = "/",
                        DownstreamScheme = "http",
                        DownstreamHostAndPorts = new List<FileHostAndPort>
                        {
                            new FileHostAndPort
                            {
                                Host = "localhost",
                                Port = 7188,
                            }
                        },
                        UpstreamPathTemplate = "/",
                        UpstreamHttpMethod = new List<string> { "Get" },
                    }
                }
            };

            var dependency = new FakeDependency();

            this.Given(x => x.GivenThereIsAServiceRunningOn("http://localhost:7188", "/", 200, "Hello from Laura"))
                .And(x => _steps.GivenThereIsAConfiguration(configuration))
                .And(x => _steps.GivenOcelotIsRunningWithGlobalHandlersRegisteredInDi<FakeHandlerWithDependency>(dependency))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
                .And(x => _steps.ThenTheResponseBodyShouldBe("Hello from Laura"))
                .And(x => ThenTheDependencyIsCalled(dependency))
                .BDDfy();
        }

        private void ThenTheDependencyIsCalled(FakeDependency dependency)
        {
            dependency.Called.ShouldBeTrue();
        }

        private void ThenTheHandlersAreCalledCorrectly()
        {
            FakeHandler.TimeCalled.ShouldBeLessThan(FakeHandlerTwo.TimeCalled);
        }

        private void ThenTheOrderedHandlersAreCalledCorrectly()
        {
            FakeHandlerTwo.TimeCalled.ShouldBeLessThan(FakeHandler.TimeCalled);
        }

        public class FakeDependency
        {
            public bool Called;
        }

        // ReSharper disable once ClassNeverInstantiated.Local
        private class FakeHandlerWithDependency : DelegatingHandler
        {
            private readonly FakeDependency _dependency;

            public FakeHandlerWithDependency(FakeDependency dependency)
            {
                _dependency = dependency;
            }

            protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
            {
                _dependency.Called = true;
                return base.SendAsync(request, cancellationToken);
            }
        }

        // ReSharper disable once ClassNeverInstantiated.Local
        private class FakeHandler : DelegatingHandler
        {
            public static DateTime TimeCalled { get; private set; }

            protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
            {
                TimeCalled = DateTime.Now;
                return base.SendAsync(request, cancellationToken);
            }
        }

        // ReSharper disable once ClassNeverInstantiated.Local
        private class FakeHandlerTwo : DelegatingHandler
        {
            public static DateTime TimeCalled { get; private set; }

            protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
            {
                TimeCalled = DateTime.Now;
                return base.SendAsync(request, cancellationToken);
            }
        }

        // ReSharper disable once ClassNeverInstantiated.Local
        private class FakeHandlerAgain : DelegatingHandler
        {
            protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
            {
                Console.WriteLine(request.RequestUri);

                //do stuff and optionally call the base handler..
                return await base.SendAsync(request, cancellationToken);
            }
        }

        private void GivenThereIsAServiceRunningOn(string baseUrl, string basePath, int statusCode, string responseBody)
        {
            _serviceHandler.GivenThereIsAServiceRunningOn(baseUrl, basePath, async context =>
            {
                _downstreamPath = !string.IsNullOrEmpty(context.Request.PathBase.Value) ? context.Request.PathBase.Value : context.Request.Path.Value;

                if (_downstreamPath != basePath)
                {
                    context.Response.StatusCode = statusCode;
                    await context.Response.WriteAsync("downstream path didnt match base path");
                }
                else
                {
                    context.Response.StatusCode = statusCode;
                    await context.Response.WriteAsync(responseBody);
                }
            });
        }

        public void Dispose()
        {
            _steps?.Dispose();
            _serviceHandler?.Dispose();
        }
    }
}