using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnityEngine;

namespace UnityEditor.Graphs.Material
{
	[Title("Channels/Splat Node")]
	class SplatNode : Function1Input
	{
		[SerializeField]
		private int m_SwizzleChannel;

		public override void Init()
		{
			base.Init ();
			name = "SplatNode";
			m_SwizzleChannel = 0;
		}

		private string GetChannelFromConfiguration ()
		{
			switch (m_SwizzleChannel)
			{
				case 0:
					return "xxxx";
				case 1:
					return "yyyy";
				case 2:
					return "zzzz";
				default:
					return "wwww";
			}
		}

		public override void NodeUI(GraphGUI host)
		{
			base.NodeUI(host);
			string[] values = {"x", "y", "z", "w"};
			EditorGUI.BeginChangeCheck ();
			m_SwizzleChannel = EditorGUILayout.Popup ("Channel", m_SwizzleChannel, values);
			if (EditorGUI.EndChangeCheck())
				RegeneratePreviewShaders ();
		}

		protected override string GetFunctionName ()
		{
			return "";
		}

		protected override string GetFunctionCallBody (string inputValue)
		{
			return inputValue + "." + GetChannelFromConfiguration ();
		}
	}
}