// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using Microsoft.AspNetCore.Mvc.Abstractions;
using Microsoft.AspNetCore.Mvc.ApplicationModels;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.AspNetCore.Mvc.Razor;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure;
using Microsoft.AspNetCore.Mvc.Routing;
using Microsoft.AspNetCore.Routing;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Microsoft.Extensions.Options;
 
namespace Microsoft.Extensions.DependencyInjection;
 
/// <summary>
/// Static class that adds razor page functionality to <see cref="IMvcCoreBuilder"/>.
/// </summary>
public static class MvcRazorPagesMvcCoreBuilderExtensions
{
    /// <summary>
    /// Register services needed for Razor Pages.
    /// </summary>
    /// <param name="builder">The <see cref="IMvcCoreBuilder"/>.</param>
    /// <returns>The <see cref="IMvcCoreBuilder"/>.</returns>
    [RequiresUnreferencedCode("Razor Pages does not currently support trimming or native AOT.", Url = "https://aka.ms/aspnet/trimming")]
    public static IMvcCoreBuilder AddRazorPages(this IMvcCoreBuilder builder)
    {
        ArgumentNullException.ThrowIfNull(builder);
 
        builder.AddRazorViewEngine();
 
        AddRazorPagesServices(builder.Services);
 
        return builder;
    }
 
    /// <summary>
    /// Register services needed for Razor Pages.
    /// </summary>
    /// <param name="builder">The <see cref="IMvcCoreBuilder"/>.</param>
    /// <param name="setupAction">The action to setup the <see cref="RazorPagesOptions"/>.</param>
    /// <returns>The <see cref="IMvcCoreBuilder"/>.</returns>
    public static IMvcCoreBuilder AddRazorPages(
        this IMvcCoreBuilder builder,
        Action<RazorPagesOptions> setupAction)
    {
        ArgumentNullException.ThrowIfNull(builder);
        ArgumentNullException.ThrowIfNull(setupAction);
 
        builder.AddRazorViewEngine();
 
        AddRazorPagesServices(builder.Services);
 
        builder.Services.Configure(setupAction);
 
        return builder;
    }
 
    /// <summary>
    /// Configures Razor Pages to use the specified <paramref name="rootDirectory"/>.
    /// </summary>
    /// <param name="builder">The <see cref="IMvcCoreBuilder"/>.</param>
    /// <param name="rootDirectory">The application relative path to use as the root directory.</param>
    /// <returns></returns>
    public static IMvcCoreBuilder WithRazorPagesRoot(this IMvcCoreBuilder builder, string rootDirectory)
    {
        ArgumentNullException.ThrowIfNull(builder);
        ArgumentException.ThrowIfNullOrEmpty(rootDirectory);
 
        builder.Services.Configure<RazorPagesOptions>(options => options.RootDirectory = rootDirectory);
        return builder;
    }
 
    // Internal for testing.
    internal static void AddRazorPagesServices(IServiceCollection services)
    {
        // Options
        services.TryAddEnumerable(
            ServiceDescriptor.Transient<IConfigureOptions<RazorViewEngineOptions>, RazorPagesRazorViewEngineOptionsSetup>());
 
        services.TryAddEnumerable(
            ServiceDescriptor.Transient<IConfigureOptions<RazorPagesOptions>, RazorPagesOptionsSetup>());
 
        // Routing
        services.TryAddEnumerable(ServiceDescriptor.Singleton<MatcherPolicy, DynamicPageEndpointMatcherPolicy>());
        services.TryAddSingleton<DynamicPageEndpointSelectorCache>();
        services.TryAddSingleton<PageActionEndpointDataSourceIdProvider>();
 
        // Action description and invocation
        var actionDescriptorProvider = services.FirstOrDefault(f =>
            f.ServiceType == typeof(IActionDescriptorProvider) &&
            f.ImplementationType == typeof(PageActionDescriptorProvider));
 
        if (actionDescriptorProvider is null)
        {
            // RuntimeCompilation registers an instance of PageActionDescriptorProvider (PageADP). CompiledPageADP and runtime compilation
            // cannot co-exist since CompiledPageADP will attempt to resolve action descriptors for lazily compiled views (such as for
            // ones from non-physical file providers). We'll instead avoid adding it if PageADP is already registered. Similarly,
            // AddRazorRuntimeCompilation will remove CompiledPageADP if it is registered.
            services.TryAddEnumerable(
                ServiceDescriptor.Singleton<IActionDescriptorProvider, CompiledPageActionDescriptorProvider>());
        }
        services.TryAddEnumerable(
            ServiceDescriptor.Singleton<IPageRouteModelProvider, CompiledPageRouteModelProvider>());
        services.TryAddSingleton<PageActionEndpointDataSourceFactory>();
        services.TryAddEnumerable(ServiceDescriptor.Singleton<MatcherPolicy, DynamicPageEndpointMatcherPolicy>());
 
        services.TryAddEnumerable(
            ServiceDescriptor.Singleton<IPageApplicationModelProvider, DefaultPageApplicationModelProvider>());
        services.TryAddEnumerable(
            ServiceDescriptor.Singleton<IPageApplicationModelProvider, AutoValidateAntiforgeryPageApplicationModelProvider>());
        services.TryAddEnumerable(
            ServiceDescriptor.Singleton<IPageApplicationModelProvider, AuthorizationPageApplicationModelProvider>());
        services.TryAddEnumerable(
            ServiceDescriptor.Singleton<IPageApplicationModelProvider, TempDataFilterPageApplicationModelProvider>());
        services.TryAddEnumerable(
            ServiceDescriptor.Singleton<IPageApplicationModelProvider, ViewDataAttributePageApplicationModelProvider>());
        services.TryAddEnumerable(
            ServiceDescriptor.Singleton<IPageApplicationModelProvider, ResponseCacheFilterApplicationModelProvider>());
 
        services.TryAddSingleton<IPageApplicationModelPartsProvider, DefaultPageApplicationModelPartsProvider>();
 
        services.TryAddEnumerable(
            ServiceDescriptor.Singleton<IActionInvokerProvider, PageActionInvokerProvider>());
        services.TryAddEnumerable(
            ServiceDescriptor.Singleton<IRequestDelegateFactory, PageRequestDelegateFactory>());
        services.TryAddSingleton<PageActionInvokerCache>();
 
        // Page and Page model creation and activation
        services.TryAddSingleton<IPageModelActivatorProvider, DefaultPageModelActivatorProvider>();
        services.TryAddSingleton<IPageModelFactoryProvider, DefaultPageModelFactoryProvider>();
 
        services.TryAddSingleton<IPageActivatorProvider, DefaultPageActivatorProvider>();
        services.TryAddSingleton<IPageFactoryProvider, DefaultPageFactoryProvider>();
 
#pragma warning disable CS0618 // Type or member is obsolete
        services.TryAddSingleton<IPageLoader>(s => s.GetRequiredService<PageLoader>());
#pragma warning restore CS0618 // Type or member is obsolete
        services.TryAddSingleton<PageLoader, DefaultPageLoader>();
        services.TryAddSingleton<IPageHandlerMethodSelector, DefaultPageHandlerMethodSelector>();
 
        // Action executors
        services.TryAddSingleton<PageResultExecutor>();
 
        services.TryAddTransient<PageSaveTempDataPropertyFilter>();
    }
}