using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Net.Http;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.TestHost;
using Ocelot.Configuration.Yaml;
using Ocelot.ManualTest;
using Shouldly;
using TestStack.BDDfy;
using Xunit;
using YamlDotNet.Serialization;

namespace Ocelot.AcceptanceTests
{
    public class ReturnsErrorTests : IDisposable
    {
        private TestServer _ocelotServer;
        private HttpClient _ocelotClient;
        private HttpResponseMessage _response;
        private readonly string _configurationPath;
        private IWebHost _servicebuilder;

        // Sadly we need to change this when we update the netcoreapp version to make the test update the config correctly
        private double _netCoreAppVersion = 1.4;

        public ReturnsErrorTests()
        {
            _configurationPath = $"./bin/Debug/netcoreapp{_netCoreAppVersion}/configuration.yaml";
        }

        [Fact]
        public void should_return_response_200_and_foward_claim_as_header()
        {
            this.Given(x => x.GivenThereIsAServiceRunningOn("http://localhost:53876"))
                .And(x => x.GivenThereIsAConfiguration(new YamlConfiguration
                {
                    ReRoutes = new List<YamlReRoute>
                    {
                        new YamlReRoute
                        {
                            DownstreamTemplate = "http://localhost:53876/",
                            UpstreamTemplate = "/",
                            UpstreamHttpMethod = "Get",
                        }
                    }
                }))
                .And(x => x.GivenTheApiGatewayIsRunning())
                .When(x => x.WhenIGetUrlOnTheApiGateway("/"))
                .Then(x => x.ThenTheStatusCodeShouldBe(HttpStatusCode.InternalServerError))
                .BDDfy();
        }

        private void WhenIGetUrlOnTheApiGateway(string url)
        {
            _response = _ocelotClient.GetAsync(url).Result;
        }

        private void ThenTheResponseBodyShouldBe(string expectedBody)
        {
            _response.Content.ReadAsStringAsync().Result.ShouldBe(expectedBody);
        }

        /// <summary>
        /// This is annoying cos it should be in the constructor but we need to set up the yaml file before calling startup so its a step.
        /// </summary>
        private void GivenTheApiGatewayIsRunning()
        {
            _ocelotServer = new TestServer(new WebHostBuilder()
                .UseStartup<Startup>());

            _ocelotClient = _ocelotServer.CreateClient();
        }

        private void GivenThereIsAConfiguration(YamlConfiguration yamlConfiguration)
        {
            var serializer = new Serializer();

            if (File.Exists(_configurationPath))
            {
                File.Delete(_configurationPath);
            }

            using (TextWriter writer = File.CreateText(_configurationPath))
            {
                serializer.Serialize(writer, yamlConfiguration);
            }
        }

        private void GivenThereIsAServiceRunningOn(string url)
        {
            _servicebuilder = new WebHostBuilder()
                .UseUrls(url)
                .UseKestrel()
                .UseContentRoot(Directory.GetCurrentDirectory())
                .UseIISIntegration()
                .UseUrls(url)
                .Configure(app =>
                {
                    app.Run(context =>
                    {
                        throw new Exception("BLAMMMM");
                    });
                })
                .Build();

            _servicebuilder.Start();
        }

        private void ThenTheStatusCodeShouldBe(HttpStatusCode expectedHttpStatusCode)
        {
            _response.StatusCode.ShouldBe(expectedHttpStatusCode);
        }

        public void Dispose()
        {
            _servicebuilder?.Dispose();
            _ocelotClient?.Dispose();
            _ocelotServer?.Dispose();
        }
    }
}