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

namespace Ocelot.AcceptanceTests
{
    public class CachingTests : IDisposable
    {
        private IWebHost _builder;
        private readonly Steps _steps;

        public CachingTests()
        {
            _steps = new Steps();
        }

        [Fact]
        public void should_return_cached_response()
        {
            var configuration = new FileConfiguration
            {
                ReRoutes = new List<FileReRoute>
                    {
                        new FileReRoute
                        {
                            DownstreamTemplate = "http://localhost:51879/",
                            UpstreamTemplate = "/",
                            UpstreamHttpMethod = "Get",
                            FileCacheOptions = new FileCacheOptions
                            {
                                TtlSeconds = 100
                            }
                        }
                    }
            };

            this.Given(x => x.GivenThereIsAServiceRunningOn("http://localhost:51879", 200, "Hello from Laura"))
                .And(x => _steps.GivenThereIsAConfiguration(configuration))
                .And(x => _steps.GivenOcelotIsRunning())
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
                .And(x => _steps.ThenTheResponseBodyShouldBe("Hello from Laura"))
                .Given(x => x.GivenTheServiceNowReturns("http://localhost:51879", 200, "Hello from Tom"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
                .And(x => _steps.ThenTheResponseBodyShouldBe("Hello from Laura"))
                .BDDfy();
        }

        [Fact]
        public void should_not_return_cached_response_as_ttl_expires()
        {
            var configuration = new FileConfiguration
            {
                ReRoutes = new List<FileReRoute>
                    {
                        new FileReRoute
                        {
                            DownstreamTemplate = "http://localhost:51879/",
                            UpstreamTemplate = "/",
                            UpstreamHttpMethod = "Get",
                            FileCacheOptions = new FileCacheOptions
                            {
                                TtlSeconds = 1
                            }
                        }
                    }
            };

            this.Given(x => x.GivenThereIsAServiceRunningOn("http://localhost:51879", 200, "Hello from Laura"))
                .And(x => _steps.GivenThereIsAConfiguration(configuration))
                .And(x => _steps.GivenOcelotIsRunning())
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
                .And(x => _steps.ThenTheResponseBodyShouldBe("Hello from Laura"))
                .Given(x => x.GivenTheServiceNowReturns("http://localhost:51879", 200, "Hello from Tom"))
                .And(x => x.GivenTheCacheExpires())
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
                .And(x => _steps.ThenTheResponseBodyShouldBe("Hello from Tom"))
                .BDDfy();
        }

        private void GivenTheCacheExpires()
        {
            Thread.Sleep(1000);
        }

        private void GivenTheServiceNowReturns(string url, int statusCode, string responseBody)
        {
            _builder.Dispose();
            GivenThereIsAServiceRunningOn(url, statusCode, responseBody);
        }

        private void GivenThereIsAServiceRunningOn(string url, int statusCode, string responseBody)
        {
            _builder = new WebHostBuilder()
                .UseUrls(url)
                .UseKestrel()
                .UseContentRoot(Directory.GetCurrentDirectory())
                .UseIISIntegration()
                .UseUrls(url)
                .Configure(app =>
                {
                    app.Run(async context =>
                    {
                        context.Response.StatusCode = statusCode;
                        await context.Response.WriteAsync(responseBody);
                    });
                })
                .Build();

            _builder.Start();
        }

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