// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Linq;
using Microsoft.Extensions.DependencyModel;
 
namespace Microsoft.AspNetCore.Mvc.ApplicationParts;
 
/// <summary>
/// Static class that adds methods to <see cref="AssemblyPart"/>.
/// </summary>
[Obsolete("Razor runtime compilation is obsolete and is not recommended for production scenarios. For production scenarios, use the default build time compilation. For development scenarios, use Hot Reload instead. For more information, visit https://aka.ms/aspnet/deprecate/003.", DiagnosticId = "ASPDEPR003")]
public static class AssemblyPartExtensions
{
    /// <inheritdoc />
    public static IEnumerable<string> GetReferencePaths(this AssemblyPart assemblyPart)
    {
        var assembly = assemblyPart?.Assembly ?? throw new ArgumentNullException(nameof(assemblyPart));
 
        if (assembly.IsDynamic)
        {
            // Skip loading process for dynamic assemblies. This prevents DependencyContextLoader from reading the
            // .deps.json file from either manifest resources or the assembly location, which will fail.
            return Enumerable.Empty<string>();
        }
 
        var dependencyContext = DependencyContext.Load(assembly);
        if (dependencyContext != null)
        {
            return dependencyContext.CompileLibraries.SelectMany(library => library.ResolveReferencePaths());
        }
 
        // If an application has been compiled without preserveCompilationContext, return the path to the assembly
        // as a reference. For runtime compilation, this will allow the compilation to succeed as long as it least
        // one application part has been compiled with preserveCompilationContext and contains a super set of types
        // required for the compilation to succeed.
        return new[] { assembly.Location };
    }
}