// 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.Intermediate
{
	/// <summary>
	/// Represents a type-inference thunk that is used by the generated component code.
	/// </summary>
	public sealed class ComponentTypeInferenceMethodIntermediateNode : IntermediateNode
	{
		public override IntermediateNodeCollection Children => IntermediateNodeCollection.ReadOnly;

		/// <summary>
		/// Gets the component usage linked to this type inference method.
		/// </summary>
		public ComponentIntermediateNode Component { get; set; }

		/// <summary>
		/// Gets the full type name of the generated class containing this method.
		/// </summary>
		public string FullTypeName { get; internal set; }

		/// <summary>
		/// Gets the name of the generated method.
		/// </summary>
		public string MethodName { get; set; }

		/// <summary>
		/// Gets a list (or null) describing additional arguments for type inference.
		/// These are populated from ancestor components that choose to cascade their type parameters.
		/// </summary>
		public List<CascadingGenericTypeParameter> ReceivesCascadingGenericTypes { get; set; }

		/// <summary>
		/// Gets a list describing the type and property constraints that are
		/// set for generic types on the methods.
		/// <example>
		/// ["where T: Foo, new()", "where U: Image", "where Z: notnull"]
		/// </example>
		/// </summary>
		public IEnumerable<string> GenericTypeConstraints { get; set; }

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

			visitor.VisitComponentTypeInferenceMethod( this );
		}

		public override void FormatNode( IntermediateNodeFormatter formatter )
		{
			if ( formatter == null )
			{
				throw new ArgumentNullException( nameof( formatter ) );
			}

			formatter.WriteContent( Component?.TagName );

			formatter.WriteProperty( nameof( Component ), Component?.Component?.DisplayName );
			formatter.WriteProperty( nameof( FullTypeName ), FullTypeName );
			formatter.WriteProperty( nameof( MethodName ), MethodName );
		}
	}
}
