using System;
using UnityEngine;

namespace UnityEditor.Graphs.Material
{
	public class MaterialOptions : ScriptableObject
	{
		public enum BlendMode
		{
			One,
			Zero,
			SrcColor,
			SrcAlpha,
			DstColor,
			DstAlpha,
			OneMinusSrcColor,
			OneMinusSrcAlpha,
			OneMinusDstColor,
			OneMinusDstAlpha,
		}

		public enum CullMode
		{
			Back,
			Front,
			Off
		}

		public enum ZTest
		{
			Less,
			Greater,
			LEqual,
			GEqual,
			Equal,
			NotEqual,
			Always
		}

		public enum ZWrite
		{
			On,
			Off
		}

		public enum RenderQueue
		{
			Background,
			Geometry,
			Transparent,
			Overlay,
		}

		public enum RenderType
		{
			Opaque,
			Transparent,
			TransparentCutout,
			Background,
			Overlay
		}

		[SerializeField]
		private BlendMode m_SrcBlend;

		[SerializeField]
		private BlendMode m_DstBlend;

		[SerializeField]
		private CullMode m_CullMode;

		[SerializeField]
		private ZTest m_ZTest;

		[SerializeField]
		private ZWrite m_ZWrite;
		
		[SerializeField]
		private RenderQueue m_RenderQueue;

		[SerializeField]
		private RenderType m_RenderType;

		[SerializeField]
		private bool m_ShadowPass;

		[SerializeField]
		private bool m_FullForwardShadows;

		[SerializeField]
		private bool m_NoAmbient;

		[SerializeField]
		private bool m_NoVertexLights;

		[SerializeField]
		private bool m_NoLightmaps;

		[SerializeField]
		private bool m_NoDirLightmap;

		[SerializeField]
		private bool m_NoForwardAdd;

		[SerializeField]
		private bool m_ApproxView;

		[SerializeField]
		private bool m_HalfAsView;

		public void Init() 
		{
			srcBlend = BlendMode.One;
			dstBlend = BlendMode.Zero;
			cullMode = CullMode.Back;
			zTest = ZTest.LEqual;
			zWrite = ZWrite.On;
			renderQueue = RenderQueue.Geometry;
			renderType = RenderType.Opaque;
			shadowPass = false;
			fullForwardShadows = false;
			noAmbient = false;
			noVertexLights = false;
			noLightmaps = false;
			noDirLightmap = false;
			noForwardAdd = false;
			approxView = false;
			halfAsView = false;
		}

		public void GetTags (ShaderGenerator visitor)
		{
			visitor.AddShaderChunk ("Tags {", false);
			visitor.Indent ();
			visitor.AddShaderChunk ("\"RenderType\"=\"" + renderType + "\"", false);
			visitor.AddShaderChunk ("\"Queue\"=\"" + renderQueue + "\"", false);
			visitor.Deindent ();
			visitor.AddShaderChunk ("}", false);
		}

		public void GetBlend (ShaderGenerator visitor)
		{
			visitor.AddShaderChunk ("Blend " + srcBlend + " " + dstBlend, false);
		}

		public void GetCull (ShaderGenerator visitor)
		{
			visitor.AddShaderChunk ("Cull " + cullMode, false);
		}

		public void GetDepthWrite (ShaderGenerator visitor)
		{
			visitor.AddShaderChunk ("ZWrite " + zWrite, false);
		}

		public void GetDepthTest (ShaderGenerator visitor)
		{
			visitor.AddShaderChunk ("ZTest " + zTest, false);
		}

		private Vector2 m_ScrollPos;
		public void DoGUI()
		{
			m_ScrollPos = GUILayout.BeginScrollView(m_ScrollPos);
			GUILayout.BeginVertical();

			srcBlend = (BlendMode)EditorGUILayout.EnumPopup ("Src Blend", srcBlend);
			dstBlend = (BlendMode)EditorGUILayout.EnumPopup ("Dst Blend", dstBlend);
			cullMode = (CullMode)EditorGUILayout.EnumPopup ("Cull Mode", cullMode);
			zTest = (ZTest)EditorGUILayout.EnumPopup ("Z Test", zTest);
			zWrite = (ZWrite)EditorGUILayout.EnumPopup ("Z Write", zWrite);
			renderQueue = (RenderQueue)EditorGUILayout.EnumPopup ("Render Queue", renderQueue);
			renderType = (RenderType)EditorGUILayout.EnumPopup ("Render Type", renderType);

			GUILayout.EndVertical();
			GUILayout.EndScrollView();
		}

		public BlendMode srcBlend { get { return m_SrcBlend; } set { m_SrcBlend = value; } }
		public BlendMode dstBlend { get { return m_DstBlend; } set { m_DstBlend = value; } }
		public CullMode cullMode { get { return m_CullMode; } set { m_CullMode = value; } }
		public ZTest zTest { get { return m_ZTest; } set { m_ZTest = value; } }
		public ZWrite zWrite { get { return m_ZWrite; } set { m_ZWrite = value; } }
		public RenderQueue renderQueue { get { return m_RenderQueue; } set { m_RenderQueue = value; } }
		public RenderType renderType { get { return m_RenderType; } set { m_RenderType = value; } }
		public bool shadowPass { get { return m_ShadowPass; } set { m_ShadowPass = value; } }
		public bool fullForwardShadows { get { return m_FullForwardShadows; } set { m_FullForwardShadows = value; } }
		public bool noAmbient { get { return m_NoAmbient; } set { m_NoAmbient = value; } }
		public bool noVertexLights { get { return m_NoVertexLights; } set { m_NoVertexLights = value; } }
		public bool noLightmaps { get { return m_NoLightmaps; } set { m_NoLightmaps = value; } }
		public bool noDirLightmap { get { return m_NoDirLightmap; } set { m_NoDirLightmap = value; } }
		public bool noForwardAdd { get { return m_NoForwardAdd; } set { m_NoForwardAdd = value; } }
		public bool approxView { get { return m_ApproxView; } set { m_ApproxView = value; } }
		public bool halfAsView { get { return m_HalfAsView; } set { m_HalfAsView = value; } }

	}
}