// 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 Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.Extensions.Options;
using Xunit;

namespace Microsoft.Extensions.DependencyInjection
{
    public class MvcViewFeaturesMvcCoreBuilderExtensionsTest
    {
        [Fact]
        public void AddViews_RegistersExpectedTempDataProvider()
        {
            // Arrange
            var services = new ServiceCollection();
            var builder = services.AddMvcCore();

            // Act
            builder.AddViews();

            // Assert
            var descriptor = Assert.Single(services, item => item.ServiceType == typeof(ITempDataProvider));
            Assert.Equal(typeof(CookieTempDataProvider), descriptor.ImplementationType);
        }

        [Fact]
        public void AddCookieTempDataProvider_RegistersExpectedTempDataProvider()
        {
            // Arrange
            var services = new ServiceCollection();
            var builder = services.AddMvcCore();

            // Act
            builder.AddCookieTempDataProvider();

            // Assert
            var descriptor = Assert.Single(services, item => item.ServiceType == typeof(ITempDataProvider));
            Assert.Equal(typeof(CookieTempDataProvider), descriptor.ImplementationType);
        }

        [Fact]
        public void AddCookieTempDataProvider_DoesNotRegisterOptionsConfiguration()
        {
            // Arrange
            var services = new ServiceCollection();
            var builder = services.AddMvcCore();

            // Act
            builder.AddCookieTempDataProvider();

            // Assert
            Assert.DoesNotContain(
                services,
                item => item.ServiceType == typeof(IConfigureOptions<CookieTempDataProviderOptions>));
        }

        [Fact]
        public void AddCookieTempDataProviderWithSetupAction_RegistersExpectedTempDataProvider()
        {
            // Arrange
            var services = new ServiceCollection();
            var builder = services.AddMvcCore();

            // Act
            builder.AddCookieTempDataProvider(options => { });

            // Assert
            var descriptor = Assert.Single(services, item => item.ServiceType == typeof(ITempDataProvider));
            Assert.Equal(typeof(CookieTempDataProvider), descriptor.ImplementationType);
        }

        [Fact]
        public void AddCookieTempDataProviderWithSetupAction_RegistersOptionsConfiguration()
        {
            // Arrange
            var services = new ServiceCollection();
            var builder = services.AddMvcCore();

            // Act
            builder.AddCookieTempDataProvider(options => { });

            // Assert
            Assert.Single(
                services,
                item => item.ServiceType == typeof(IConfigureOptions<CookieTempDataProviderOptions>));
        }

        [Fact]
        public void AddCookieTempDataProvider_RegistersExpectedTempDataProvider_IfCalledBeforeAddViews()
        {
            // Arrange
            var services = new ServiceCollection();
            var builder = services.AddMvcCore();

            // Act
            builder.AddCookieTempDataProvider();
            builder.AddViews();

            // Assert
            var descriptor = Assert.Single(services, item => item.ServiceType == typeof(ITempDataProvider));
            Assert.Equal(typeof(CookieTempDataProvider), descriptor.ImplementationType);
        }

        [Fact]
        public void AddCookieTempDataProviderWithSetupAction_RegistersExpectedTempDataProvider_IfCalledBeforeAddViews()
        {
            // Arrange
            var services = new ServiceCollection();
            var builder = services.AddMvcCore();

            // Act
            builder.AddCookieTempDataProvider(options => { });
            builder.AddViews();

            // Assert
            var descriptor = Assert.Single(services, item => item.ServiceType == typeof(ITempDataProvider));
            Assert.Equal(typeof(CookieTempDataProvider), descriptor.ImplementationType);
        }

        [Fact]
        public void AddCookieTempDataProvider_RegistersExpectedTempDataProvider_IfCalledAfterAddViews()
        {
            // Arrange
            var services = new ServiceCollection();
            var builder = services.AddMvcCore();

            // Act
            builder.AddViews();
            builder.AddCookieTempDataProvider();

            // Assert
            var descriptor = Assert.Single(services, item => item.ServiceType == typeof(ITempDataProvider));
            Assert.Equal(typeof(CookieTempDataProvider), descriptor.ImplementationType);
        }

        [Fact]
        public void AddCookieTempDataProviderWithSetupAction_RegistersExpectedTempDataProvider_IfCalledAfterAddViews()
        {
            // Arrange
            var services = new ServiceCollection();
            var builder = services.AddMvcCore();

            // Act
            builder.AddViews();
            builder.AddCookieTempDataProvider(options => { });

            // Assert
            var descriptor = Assert.Single(services, item => item.ServiceType == typeof(ITempDataProvider));
            Assert.Equal(typeof(CookieTempDataProvider), descriptor.ImplementationType);
        }

        [Fact]
        public void AddCookieTempDataProvider_RegistersExpectedTempDataProvider_IfCalledTwice()
        {
            // Arrange
            var services = new ServiceCollection();
            var builder = services.AddMvcCore();

            // Act
            builder.AddCookieTempDataProvider();
            builder.AddCookieTempDataProvider();

            // Assert
            var descriptor = Assert.Single(services, item => item.ServiceType == typeof(ITempDataProvider));
            Assert.Equal(typeof(CookieTempDataProvider), descriptor.ImplementationType);
        }

        [Fact]
        public void AddCookieTempDataProviderWithSetupAction_RegistersExpectedTempDataProvider_IfCalledTwice()
        {
            // Arrange
            var services = new ServiceCollection();
            var builder = services.AddMvcCore();

            // Act
            builder.AddCookieTempDataProvider(options => { });
            builder.AddCookieTempDataProvider(options => { });

            // Assert
            var descriptor = Assert.Single(services, item => item.ServiceType == typeof(ITempDataProvider));
            Assert.Equal(typeof(CookieTempDataProvider), descriptor.ImplementationType);
        }
    }
}