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

namespace UnityEditor.Graphs.Material
{
	[Title("Channels/Swizzle Node")]
	class SwizzleNode : Function2Input
	{
		[SerializeField]
		private int[] m_SwizzleChannel = new int[4];

		public override void Init()
		{
			base.Init ();
			name = "SwizzleNode";
		}

		public override void NodeUI(GraphGUI host)
		{
			base.NodeUI(host);
			string[] channelNames = { "X", "Y", "Z", "W" };
			string[] values = { "0", "1", "Input1.x", "Input1.y", "Input1.z", "Input1.w", "Input2.x", "Input2.y", "Input2.z", "Input2.w" };
			EditorGUI.BeginChangeCheck ();
			for (int n = 0; n < 4; n++)
				m_SwizzleChannel[n] = EditorGUILayout.Popup(channelNames[n] + "=", m_SwizzleChannel[n], values);
			if (EditorGUI.EndChangeCheck())
				RegeneratePreviewShaders ();
		}

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

		protected override string GetFunctionCallBody(string inputValue1, string inputValue2)
		{
			string[] inputValues = { inputValue1, inputValue2 };
			string[] channelNames = { "x", "y", "z", "w" };
			string s = precision + "4(";
			for (int n = 0; n < 4; n++)
			{
				int c = m_SwizzleChannel[n];
				if (c < 2)
					s += c;
				else
				{
					c -= 2;
					s += inputValues[c >> 2] + "." + channelNames[c & 3];
				}
				s += (n == 3) ? ")" : ",";
			}
			return s;
		}
	}
}