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

    public class CachingTests : IDisposable
    {
        private readonly Steps _steps;
        private readonly ServiceHandler _serviceHandler;

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

        [Fact]
        public void should_return_cached_response()
        {
            var configuration = new FileConfiguration
            {
                ReRoutes = new List<FileReRoute>
                    {
                        new FileReRoute
                        {
                            DownstreamPathTemplate = "/",
                            DownstreamHostAndPorts = new List<FileHostAndPort>
                            {
                                new FileHostAndPort
                                {
                                    Host = "localhost",
                                    Port = 51899,
                                }
                            },
                            DownstreamScheme = "http",
                            UpstreamPathTemplate = "/",
                            UpstreamHttpMethod = new List<string> { "Get" },
                            FileCacheOptions = new FileCacheOptions
                            {
                                TtlSeconds = 100
                            }
                        }
                    }
            };

            this.Given(x => x.GivenThereIsAServiceRunningOn("http://localhost:51899", 200, "Hello from Laura", null, null))
                .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:51899", 200, "Hello from Tom"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
                .And(x => _steps.ThenTheResponseBodyShouldBe("Hello from Laura"))
                .And(x => _steps.ThenTheContentLengthIs(16))
                .BDDfy();
        }

        [Fact]
        public void should_return_cached_response_with_expires_header()
        {
            var configuration = new FileConfiguration
            {
                ReRoutes = new List<FileReRoute>
                    {
                        new FileReRoute
                        {
                            DownstreamPathTemplate = "/",
                            DownstreamHostAndPorts = new List<FileHostAndPort>
                            {
                                new FileHostAndPort
                                {
                                    Host = "localhost",
                                    Port = 52839,
                                }
                            },
                            DownstreamScheme = "http",
                            UpstreamPathTemplate = "/",
                            UpstreamHttpMethod = new List<string> { "Get" },
                            FileCacheOptions = new FileCacheOptions
                            {
                                TtlSeconds = 100
                            }
                        }
                    }
            };

            this.Given(x => x.GivenThereIsAServiceRunningOn("http://localhost:52839", 200, "Hello from Laura", "Expires", "-1"))
                .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:52839", 200, "Hello from Tom"))
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
                .And(x => _steps.ThenTheResponseBodyShouldBe("Hello from Laura"))
                .And(x => _steps.ThenTheContentLengthIs(16))
                .And(x => _steps.ThenTheResponseBodyHeaderIs("Expires", "-1"))
                .BDDfy();
        }

        [Fact]
        public void should_return_cached_response_when_using_jsonserialized_cache()
        {
            var configuration = new FileConfiguration
            {
                ReRoutes = new List<FileReRoute>
                    {
                        new FileReRoute
                        {
                            DownstreamPathTemplate = "/",
                            DownstreamHostAndPorts = new List<FileHostAndPort>
                            {
                                new FileHostAndPort
                                {
                                    Host = "localhost",
                                    Port = 51899,
                                }
                            },
                            DownstreamScheme = "http",
                            UpstreamPathTemplate = "/",
                            UpstreamHttpMethod = new List<string> { "Get" },
                            FileCacheOptions = new FileCacheOptions
                            {
                                TtlSeconds = 100
                            }
                        }
                    }
            };

            this.Given(x => x.GivenThereIsAServiceRunningOn("http://localhost:51899", 200, "Hello from Laura", null, null))
                .And(x => _steps.GivenThereIsAConfiguration(configuration))
                .And(x => _steps.GivenOcelotIsRunningUsingJsonSerializedCache())
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
                .And(x => _steps.ThenTheResponseBodyShouldBe("Hello from Laura"))
                .Given(x => x.GivenTheServiceNowReturns("http://localhost:51899", 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
                        {
                            DownstreamPathTemplate = "/",
                            DownstreamHostAndPorts = new List<FileHostAndPort>
                            {
                                new FileHostAndPort
                                {
                                    Host = "localhost",
                                    Port = 51899,
                                }
                            },
                            DownstreamScheme = "http",
                            UpstreamPathTemplate = "/",
                            UpstreamHttpMethod = new List<string> { "Get" },
                            FileCacheOptions = new FileCacheOptions
                            {
                                TtlSeconds = 1
                            }
                        }
                    }
            };

            this.Given(x => x.GivenThereIsAServiceRunningOn("http://localhost:51899", 200, "Hello from Laura", null, null))
                .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:51899", 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)
        {
            _serviceHandler.Dispose();
            GivenThereIsAServiceRunningOn(url, statusCode, responseBody, null, null);
        }

        private void GivenThereIsAServiceRunningOn(string url, int statusCode, string responseBody, string key, string value)
        {
            _serviceHandler.GivenThereIsAServiceRunningOn(url, async context =>
            {
                if (!string.IsNullOrEmpty(key) && !string.IsNullOrEmpty(key))
                {
                    context.Response.Headers.Add(key, value);
                }
                context.Response.StatusCode = statusCode;
                await context.Response.WriteAsync(responseBody);
            });
        }

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