// 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 System.Collections.Generic;
using System.Linq;

namespace Microsoft.AspNetCore.Razor.Language.Intermediate
{
	public sealed class TagHelperIntermediateNode : IntermediateNode
	{
		public override IntermediateNodeCollection Children { get; } = new IntermediateNodeCollection();

		public TagMode TagMode { get; set; }

		public string TagName { get; set; }

		public IList<TagHelperDescriptor> TagHelpers { get; } = new List<TagHelperDescriptor>();

		public TagHelperBodyIntermediateNode Body => Children.OfType<TagHelperBodyIntermediateNode>().SingleOrDefault();

		public IEnumerable<TagHelperPropertyIntermediateNode> Properties
		{
			get
			{
				return Children.OfType<TagHelperPropertyIntermediateNode>();
			}
		}

		public IEnumerable<TagHelperHtmlAttributeIntermediateNode> HtmlAttributes
		{
			get
			{
				return Children.OfType<TagHelperHtmlAttributeIntermediateNode>();
			}
		}

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

			visitor.VisitTagHelper( this );
		}

		public override void FormatNode( IntermediateNodeFormatter formatter )
		{
			formatter.WriteContent( TagName );

			formatter.WriteProperty( nameof( TagHelpers ), string.Join( ", ", TagHelpers.Select( t => t.DisplayName ) ) );
			formatter.WriteProperty( nameof( TagMode ), TagMode.ToString() );
			formatter.WriteProperty( nameof( TagName ), TagName );
		}
	}
}
