namespace Ocelot.AcceptanceTests
{
    using IdentityServer4.Test;
    using Shouldly;
    using IdentityServer4.AccessTokenValidation;
    using IdentityServer4.Models;
    using Microsoft.AspNetCore.Builder;
    using Microsoft.AspNetCore.Hosting;
    using Microsoft.AspNetCore.Http;
    using Microsoft.Extensions.DependencyInjection;
    using Microsoft.Extensions.Primitives;
    using Ocelot.Configuration.File;
    using System;
    using System.Collections.Generic;
    using System.IO;
    using System.Net;
    using System.Security.Claims;
    using TestStack.BDDfy;
    using Xunit;

    public class ClaimsToQueryStringForwardingTests : IDisposable
    {
        private IWebHost _servicebuilder;
        private IWebHost _identityServerBuilder;
        private readonly Steps _steps;
        private Action<IdentityServerAuthenticationOptions> _options;
        private string _identityServerRootUrl;
        private string _downstreamQueryString;

        public ClaimsToQueryStringForwardingTests()
        {
            _steps = new Steps();
            var identityServerPort = RandomPortFinder.GetRandomPort();
            _identityServerRootUrl = $"http://localhost:{identityServerPort}";
            _options = o =>
            {
                o.Authority = _identityServerRootUrl;
                o.ApiName = "api";
                o.RequireHttpsMetadata = false;
                o.SupportedTokens = SupportedTokens.Both;
                o.ApiSecret = "secret";
            };
        }

        [Fact]
        public void should_return_response_200_and_foward_claim_as_query_string()
        {
            var user = new TestUser()
            {
                Username = "test",
                Password = "test",
                SubjectId = "registered|1231231",
                Claims = new List<Claim>
                {
                    new Claim("CustomerId", "123"),
                    new Claim("LocationId", "1"),
                },
            };

            int port = RandomPortFinder.GetRandomPort();

            var configuration = new FileConfiguration
            {
                Routes = new List<FileRoute>
                {
                    new FileRoute
                    {
                        DownstreamPathTemplate = "/",
                        DownstreamHostAndPorts = new List<FileHostAndPort>
                        {
                            new FileHostAndPort
                            {
                                Host = "localhost",
                                Port = port,
                            },
                        },
                        DownstreamScheme = "http",
                        UpstreamPathTemplate = "/",
                        UpstreamHttpMethod = new List<string> { "Get" },
                        AuthenticationOptions = new FileAuthenticationOptions
                        {
                            AuthenticationProviderKey = "Test",
                            AllowedScopes = new List<string>
                            {
                                "openid", "offline_access", "api",
                            },
                        },
                        AddQueriesToRequest =
                        {
                            {"CustomerId", "Claims[CustomerId] > value"},
                            {"LocationId", "Claims[LocationId] > value"},
                            {"UserType", "Claims[sub] > value[0] > |"},
                            {"UserId", "Claims[sub] > value[1] > |"},
                        },
                    },
                },
            };

            this.Given(x => x.GivenThereIsAnIdentityServerOn(_identityServerRootUrl, "api", AccessTokenType.Jwt, user))
                .And(x => x.GivenThereIsAServiceRunningOn($"http://localhost:{port}", 200))
                .And(x => _steps.GivenIHaveAToken(_identityServerRootUrl))
                .And(x => _steps.GivenThereIsAConfiguration(configuration))
                .And(x => _steps.GivenOcelotIsRunning(_options, "Test"))
                .And(x => _steps.GivenIHaveAddedATokenToMyRequest())
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
                .And(x => _steps.ThenTheResponseBodyShouldBe("CustomerId: 123 LocationId: 1 UserType: registered UserId: 1231231"))
                .BDDfy();
        }

        [Fact]
        public void should_return_response_200_and_foward_claim_as_query_string_and_preserve_original_string()
        {
            var user = new TestUser()
            {
                Username = "test",
                Password = "test",
                SubjectId = "registered|1231231",
                Claims = new List<Claim>
                {
                    new Claim("CustomerId", "123"),
                    new Claim("LocationId", "1"),
                },
            };

            int port = RandomPortFinder.GetRandomPort();

            var configuration = new FileConfiguration
            {
                Routes = new List<FileRoute>
                {
                    new FileRoute
                    {
                        DownstreamPathTemplate = "/",
                        DownstreamHostAndPorts = new List<FileHostAndPort>
                        {
                            new FileHostAndPort
                            {
                                Host = "localhost",
                                Port = port,
                            },
                        },
                        DownstreamScheme = "http",
                        UpstreamPathTemplate = "/",
                        UpstreamHttpMethod = new List<string> { "Get" },
                        AuthenticationOptions = new FileAuthenticationOptions
                        {
                            AuthenticationProviderKey = "Test",
                            AllowedScopes = new List<string>
                            {
                                "openid", "offline_access", "api",
                            },
                        },
                        AddQueriesToRequest =
                        {
                            {"CustomerId", "Claims[CustomerId] > value"},
                            {"LocationId", "Claims[LocationId] > value"},
                            {"UserType", "Claims[sub] > value[0] > |"},
                            {"UserId", "Claims[sub] > value[1] > |"},
                        },
                    },
                },
            };

            this.Given(x => x.GivenThereIsAnIdentityServerOn(_identityServerRootUrl, "api", AccessTokenType.Jwt, user))
                .And(x => x.GivenThereIsAServiceRunningOn($"http://localhost:{port}", 200))
                .And(x => _steps.GivenIHaveAToken(_identityServerRootUrl))
                .And(x => _steps.GivenThereIsAConfiguration(configuration))
                .And(x => _steps.GivenOcelotIsRunning(_options, "Test"))
                .And(x => _steps.GivenIHaveAddedATokenToMyRequest())
                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/?test=1&test=2"))
                .Then(x => _steps.ThenTheStatusCodeShouldBe(HttpStatusCode.OK))
                .And(x => _steps.ThenTheResponseBodyShouldBe("CustomerId: 123 LocationId: 1 UserType: registered UserId: 1231231"))
                .And(_ => ThenTheQueryStringIs("?test=1&test=2&CustomerId=123&LocationId=1&UserId=1231231&UserType=registered"))
                .BDDfy();
        }

        private void ThenTheQueryStringIs(string queryString)
        {
            _downstreamQueryString.ShouldBe(queryString);
        }

        private void GivenThereIsAServiceRunningOn(string url, int statusCode)
        {
            _servicebuilder = new WebHostBuilder()
                .UseUrls(url)
                .UseKestrel()
                .UseContentRoot(Directory.GetCurrentDirectory())
                .UseIISIntegration()
                .UseUrls(url)
                .Configure(app =>
                {
                    app.Run(async context =>
                    {
                        _downstreamQueryString = context.Request.QueryString.Value;

                        StringValues customerId;
                        context.Request.Query.TryGetValue("CustomerId", out customerId);

                        StringValues locationId;
                        context.Request.Query.TryGetValue("LocationId", out locationId);

                        StringValues userType;
                        context.Request.Query.TryGetValue("UserType", out userType);

                        StringValues userId;
                        context.Request.Query.TryGetValue("UserId", out userId);

                        var responseBody = $"CustomerId: {customerId} LocationId: {locationId} UserType: {userType} UserId: {userId}";
                        context.Response.StatusCode = statusCode;
                        await context.Response.WriteAsync(responseBody);
                    });
                })
                .Build();

            _servicebuilder.Start();
        }

        private void GivenThereIsAnIdentityServerOn(string url, string apiName, AccessTokenType tokenType, TestUser user)
        {
            _identityServerBuilder = new WebHostBuilder()
                .UseUrls(url)
                .UseKestrel()
                .UseContentRoot(Directory.GetCurrentDirectory())
                .UseIISIntegration()
                .UseUrls(url)
                .ConfigureServices(services =>
                {
                    services.AddLogging();
                    services.AddIdentityServer()
                        .AddDeveloperSigningCredential()
                        .AddInMemoryApiScopes(new List<ApiScope>
                        {
                            new ApiScope(apiName, "test"),
                            new ApiScope("openid", "test"),
                            new ApiScope("offline_access", "test"),
                            new ApiScope("api.readOnly", "test"),
                        })
                        .AddInMemoryApiResources(new List<ApiResource>
                        {
                            new ApiResource
                            {
                                Name = apiName,
                                Description = "My API",
                                Enabled = true,
                                DisplayName = "test",
                                Scopes = new List<string>()
                                {
                                    "api",
                                    "openid",
                                    "offline_access",
                                },
                                ApiSecrets = new List<Secret>()
                                {
                                    new Secret
                                    {
                                        Value = "secret".Sha256(),
                                    },
                                },
                                UserClaims = new List<string>()
                                {
                                    "CustomerId", "LocationId", "UserType", "UserId",
                                },
                            },
                        })
                        .AddInMemoryClients(new List<Client>
                        {
                            new Client
                            {
                                ClientId = "client",
                                AllowedGrantTypes = GrantTypes.ResourceOwnerPassword,
                                ClientSecrets = new List<Secret> {new Secret("secret".Sha256())},
                                AllowedScopes = new List<string> { apiName, "openid", "offline_access" },
                                AccessTokenType = tokenType,
                                Enabled = true,
                                RequireClientSecret = false,
                            },
                        })
                        .AddTestUsers(new List<TestUser>
                        {
                            user,
                        });
                })
                .Configure(app =>
                {
                    app.UseIdentityServer();
                })
                .Build();

            _identityServerBuilder.Start();

            _steps.VerifyIdentiryServerStarted(url);
        }

        public void Dispose()
        {
            _servicebuilder?.Dispose();
            _steps.Dispose();
            _identityServerBuilder?.Dispose();
        }
    }
}