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

using System;
using Microsoft.AspNetCore.Razor.Language.CodeGeneration;
using Microsoft.AspNetCore.Razor.Language.Intermediate;

namespace Microsoft.AspNetCore.Razor.Language.Extensions
{
	/// <summary>
	/// An <see cref="ExtensionIntermediateNode"/> that generates code for <c>RazorCompiledItemMetadataAttribute</c>.
	/// </summary>
	public class RazorCompiledItemMetadataAttributeIntermediateNode : ExtensionIntermediateNode
	{
		public override IntermediateNodeCollection Children => IntermediateNodeCollection.ReadOnly;

		/// <summary>
		/// Gets or sets the attribute key.
		/// </summary>
		public string Key { get; set; }

		/// <summary>
		/// Gets or sets the attribute value.
		/// </summary>
		public string Value { get; set; }

		public override void Accept( IntermediateNodeVisitor visitor )
		{
			if ( visitor == null )
			{
				throw new ArgumentNullException( nameof( visitor ) );
			}

			AcceptExtensionNode( this, visitor );
		}

		public override void WriteNode( CodeTarget target, CodeRenderingContext context )
		{
			if ( target == null )
			{
				throw new ArgumentNullException( nameof( target ) );
			}

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

			var extension = target.GetExtension<IMetadataAttributeTargetExtension>();
			if ( extension == null )
			{
				ReportMissingCodeTargetExtension<IMetadataAttributeTargetExtension>( context );
				return;
			}

			extension.WriteRazorCompiledItemMetadataAttribute( context, this );
		}

		public override void FormatNode( IntermediateNodeFormatter formatter )
		{
			formatter.WriteProperty( nameof( Key ), Key );
			formatter.WriteProperty( nameof( Value ), Value );
		}
	}
}
