using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using Consul;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Ocelot.Configuration.File;
using Shouldly;
using TestStack.BDDfy;
using Xunit;

namespace Ocelot.AcceptanceTests
{
    public class TwoDownstreamServicesTests : IDisposable
    {
        private IWebHost _builderOne;
        private IWebHost _builderTwo;
        private IWebHost _fakeConsulBuilder;
        private readonly Steps _steps;
        private readonly List<ServiceEntry> _serviceEntries;
        private string _downstreamPathOne;
        private string _downstreamPathTwo;

        public TwoDownstreamServicesTests()
        {
            _steps = new Steps();
            _serviceEntries = new List<ServiceEntry>();
        }

        [Fact]
        public void should_fix_issue_194()
        {
            var consulPort = 8503;
            var downstreamServiceOneUrl = "http://localhost:8362";
            var downstreamServiceTwoUrl = "http://localhost:8330";
            var fakeConsulServiceDiscoveryUrl = $"http://localhost:{consulPort}";
          
            var configuration = new FileConfiguration
            {
                ReRoutes = new List<FileReRoute>
                    {
                        new FileReRoute
                        {
                            DownstreamPathTemplate = "/api/user/{user}",
                            DownstreamScheme = "http",
                            DownstreamHostAndPorts = new List<FileHostAndPort>
                            {
                                new FileHostAndPort
                                {
                                    Host = "localhost",
                                    Port = 8362,
                                }
                            },
                            UpstreamPathTemplate = "/api/user/{user}",
                            UpstreamHttpMethod = new List<string> { "Get" },
                        },
                        new FileReRoute
                        {
                            DownstreamPathTemplate = "/api/product/{product}",
                            DownstreamScheme = "http",
                            DownstreamHostAndPorts = new List<FileHostAndPort>
                            {
                                new FileHostAndPort
                                {
                                    Host = "localhost",
                                    Port = 8330,
                                }
                            },
                            UpstreamPathTemplate = "/api/product/{product}",
                            UpstreamHttpMethod = new List<string> { "Get" },
                        }
                    },
                    GlobalConfiguration = new FileGlobalConfiguration()
                    {
                        ServiceDiscoveryProvider = new FileServiceDiscoveryProvider()
                        {
                            Host = "localhost",
                            Port = consulPort
                        }
                    }
            };

            this.Given(x => x.GivenProductServiceOneIsRunning(downstreamServiceOneUrl, "/api/user/info", 200, "user"))
                .And(x => x.GivenProductServiceTwoIsRunning(downstreamServiceTwoUrl, "/api/product/info", 200, "product"))
                .And(x => x.GivenThereIsAFakeConsulServiceDiscoveryProvider(fakeConsulServiceDiscoveryUrl))
                .And(x => _steps.GivenThereIsAConfiguration(configuration))
                .And(x => _steps.GivenOcelotIsRunning())
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/api/user/info?id=1"))
                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
                .And(x => _steps.ThenTheResponseBodyShouldBe("user"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/api/product/info?id=1"))
                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
                .And(x => _steps.ThenTheResponseBodyShouldBe("product"))
                .BDDfy();
        }

        private void GivenThereIsAFakeConsulServiceDiscoveryProvider(string url)
        {
            _fakeConsulBuilder = new WebHostBuilder()
                            .UseUrls(url)
                            .UseKestrel()
                            .UseContentRoot(Directory.GetCurrentDirectory())
                            .UseIISIntegration()
                            .UseUrls(url)
                            .Configure(app =>
                            {
                                app.Run(async context =>
                                {
                                    if(context.Request.Path.Value == "/v1/health/service/product")
                                    {
                                        await context.Response.WriteJsonAsync(_serviceEntries);
                                    }
                                });
                            })
                            .Build();

            _fakeConsulBuilder.Start();
        }

        private void GivenProductServiceOneIsRunning(string baseUrl, string basePath, int statusCode, string responseBody)
        {
            _builderOne = new WebHostBuilder()
                .UseUrls(baseUrl)
                .UseKestrel()
                .UseContentRoot(Directory.GetCurrentDirectory())
                .UseIISIntegration()
                .Configure(app =>
                {
                    app.UsePathBase(basePath);
                    app.Run(async context =>
                    {   
                        _downstreamPathOne = !string.IsNullOrEmpty(context.Request.PathBase.Value) ? context.Request.PathBase.Value : context.Request.Path.Value;

                        if(_downstreamPathOne != 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);
                        }
                    });
                })
                .Build();

            _builderOne.Start();
        }

        private void GivenProductServiceTwoIsRunning(string baseUrl, string basePath, int statusCode, string responseBody)
        {
            _builderTwo = new WebHostBuilder()
                .UseUrls(baseUrl)
                .UseKestrel()
                .UseContentRoot(Directory.GetCurrentDirectory())
                .UseIISIntegration()
                .Configure(app =>
                {
                    app.UsePathBase(basePath);
                    app.Run(async context =>
                    {   
                        _downstreamPathTwo = !string.IsNullOrEmpty(context.Request.PathBase.Value) ? context.Request.PathBase.Value : context.Request.Path.Value;

                        if(_downstreamPathTwo != 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);
                        }
                    });
                })
                .Build();

            _builderTwo.Start();
        }

        public void Dispose()
        {
            _builderOne?.Dispose();
            _builderTwo?.Dispose();
            _steps.Dispose();
        }
    }
}