// Copyright © 2017 Dmitry Sikorsky. 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.Linq;

using ExtCore.Infrastructure;

using ExtCore.Infrastructure.Actions;

using Microsoft.AspNetCore.Hosting;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.FileProviders;

namespace ExtCore.Mvc.Actions

{

/// <summary>

/// Implements the <see cref="IConfigureServicesAction">IConfigureServicesAction</see> interface and

/// creates and registers the composite file provider that contains resources from all the extensions.

/// </summary>

public class AddStaticFilesAction : IConfigureServicesAction

{

/// <summary>

/// Priority of the action. The actions will be executed in the order specified by the priority (from smallest to largest).

/// </summary>

public int Priority => 1000;

/// <summary>

/// Creates and registers the composite file provider that contains resources from all the extensions.

/// </summary>

/// <param name="services">

/// Will be provided by the ExtCore and might be used to register any service inside the DI.

/// </param>

/// <param name="serviceProvider">

/// Will be provided by the ExtCore and might be used to get any service that is registered inside the DI at this moment.

/// </param>

public void Execute(IServiceCollection services, IServiceProvider serviceProvider)

{

serviceProvider.GetService<IWebHostEnvironment>().WebRootFileProvider = this.CreateCompositeFileProvider(serviceProvider);

}

private IFileProvider CreateCompositeFileProvider(IServiceProvider serviceProvider)

{

IFileProvider[] fileProviders = new IFileProvider[] {

serviceProvider.GetService<IWebHostEnvironment>().WebRootFileProvider

};

return new CompositeFileProvider(

fileProviders.Concat(

ExtensionManager.Assemblies.Select(a => new EmbeddedFileProvider(a, a.GetName().Name))

)

);

}

}

}