// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;

namespace Microsoft.AspNetCore.Razor.Language.Extensions
{
	// The default scheme for identifiers matches MVC's view engine paths:
	// 1. Normalize backslash to forward-slash
	// 2. Always include leading slash
	// 3. Always include file name and extensions
	internal class DefaultMetadataIdentifierFeature : RazorEngineFeatureBase, IMetadataIdentifierFeature
	{
		public string GetIdentifier( RazorCodeDocument codeDocument, RazorSourceDocument sourceDocument )
		{
			if ( codeDocument == null )
			{
				throw new ArgumentNullException( nameof( codeDocument ) );
			}

			if ( sourceDocument == null )
			{
				throw new ArgumentNullException( nameof( sourceDocument ) );
			}

			if ( string.IsNullOrEmpty( sourceDocument.RelativePath ) )
			{
				return null;
			}

			var identifier = sourceDocument.RelativePath;
			identifier = identifier.Replace( "\\", "/" );
			if ( !identifier.StartsWith( "/", StringComparison.Ordinal ) )
			{
				identifier = "/" + identifier;
			}

			return identifier;
		}
	}
}
