// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Threading.Tasks;
using ControllerDiscoveryConventionsWebSite;
using Microsoft.AspNet.Builder;
using Microsoft.Framework.DependencyInjection;
using Microsoft.Framework.Runtime;
using Xunit;

namespace Microsoft.AspNet.Mvc.FunctionalTests
{
    public class ControllerDiscoveryConventionTests
    {
        private const string SiteName = nameof(ControllerDiscoveryConventionsWebSite);
        private readonly Action<IApplicationBuilder> _app = new Startup().Configure;
        private readonly Action<IServiceCollection> _configureServices = new Startup().ConfigureServices;

        [Fact]
        public async Task AbstractControllers_AreSkipped()
        {
            // Arrange
            var server = TestHelper.CreateServer(_app, SiteName, _configureServices);
            var client = server.CreateClient();
            client.BaseAddress = new Uri("http://localhost/");

            // Act
            var response = await client.GetAsync("Abstract/GetValue");

            // Assert
            Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
        }

        [Fact]
        public async Task TypesDerivingFromControllerBaseTypesThatDoNotReferenceMvc_AreSkipped()
        {
            // Arrange
            var server = TestHelper.CreateServer(_app, SiteName, _configureServices);
            var client = server.CreateClient();
            client.BaseAddress = new Uri("http://localhost/");

            // Act
            var response = await client.GetAsync("SqlTransactionManager/GetValue");

            // Assert
            Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
        }

        [Fact]
        public async Task TypesMarkedWithNonController_AreSkipped()
        {
            // Arrange
            var server = TestHelper.CreateServer(_app, SiteName, _configureServices);
            var client = server.CreateClient();
            client.BaseAddress = new Uri("http://localhost/");

            // Act
            var response = await client.GetAsync("NonController/GetValue");

            // Assert
            Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
        }

        [Fact]
        public async Task PocoTypesWithControllerSuffix_AreDiscovered()
        {
            // Arrange
            var server = TestHelper.CreateServer(_app, SiteName, _configureServices);
            var client = server.CreateClient();
            client.BaseAddress = new Uri("http://localhost/");

            // Act
            var response = await client.GetAsync("Poco/GetValue");

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("PocoController", await response.Content.ReadAsStringAsync());
        }

        [Fact]
        public async Task TypesDerivingFromTypesWithControllerSuffix_AreDiscovered()
        {
            // Arrange
            var server = TestHelper.CreateServer(_app, SiteName, _configureServices);
            var client = server.CreateClient();
            client.BaseAddress = new Uri("http://localhost/");

            // Act
            var response = await client.GetAsync("ChildOfAbstract/GetValue");

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("AbstractController", await response.Content.ReadAsStringAsync());
        }

        [Fact]
        public async Task TypesDerivingFromApiController_AreDiscovered()
        {
            // Arrange
            // TestHelper.CreateServer normally replaces the DefaultAssemblyProvider with a provider that
            // limits the set of candidate assemblies to the executing application. For this test,
            // we'll switch it back to using a filtered default assembly provider.
            var server = TestHelper.CreateServer(
                _app,
                SiteName,
                services =>
                {
                    _configureServices(services);
                    services.AddTransient<IAssemblyProvider, FilteredDefaultAssemblyProvider>();
                });

            var client = server.CreateClient();
            client.BaseAddress = new Uri("http://localhost/");

            // Act
            var response = await client.GetAsync("PersonApi/GetValue");

            // Assert
            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
            Assert.Equal("PersonApi", await response.Content.ReadAsStringAsync());
        }

        private class FilteredDefaultAssemblyProvider : DefaultAssemblyProvider
        {
            public FilteredDefaultAssemblyProvider(ILibraryManager libraryManager)
                : base(libraryManager)
            {

            }

            protected override IEnumerable<ILibraryInformation> GetCandidateLibraries()
            {
                var libraries = base.GetCandidateLibraries();
                // Filter out other WebSite projects
                return libraries.Where(library => !library.Name.Contains("WebSite") ||
                        library.Name.Equals(nameof(ControllerDiscoveryConventionsWebSite), StringComparison.Ordinal));
            }
        }
    }
}