// 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;

namespace Microsoft.AspNetCore.Razor.Language
{
	public abstract class TagHelperDescriptorProviderContext
	{
		public virtual bool ExcludeHidden { get; set; }

		public virtual bool IncludeDocumentation { get; set; }

		public abstract ItemCollection Items { get; }

		public abstract ICollection<TagHelperDescriptor> Results { get; }

		public static TagHelperDescriptorProviderContext Create()
		{
			return new DefaultContext( new List<TagHelperDescriptor>() );
		}

		public static TagHelperDescriptorProviderContext Create( ICollection<TagHelperDescriptor> results )
		{
			if ( results == null )
			{
				throw new ArgumentNullException( nameof( results ) );
			}

			return new DefaultContext( results );
		}

		private class DefaultContext : TagHelperDescriptorProviderContext
		{
			public DefaultContext( ICollection<TagHelperDescriptor> results )
			{
				Results = results;

				Items = new ItemCollection();
			}

			public override ItemCollection Items { get; }

			public override ICollection<TagHelperDescriptor> Results { get; }
		}
	}
}
