// Amplify Shader Editor - Visual Shader Editing Tool
// Copyright (c) Amplify Creations, Lda <info@amplify.pt>

using UnityEngine;
using UnityEditor;
using System;

namespace AmplifyShaderEditor
{
	public enum VirtualPreset
	{
		Unity_Legacy,
		Unity5,
		Alloy,
		UBER,
		Skyshop,
		Lux
	}

	public enum VirtualChannel
	{
		Albedo = 0,
		Base,
		Normal,
		Height,
		Occlusion,
		Displacement,
		Specular,
		SpecMet,
		Material,
	}

	[Serializable]
	[NodeAttributes( "Virtual Texture Object", "Textures", "Represents a Virtual Texture Asset", SortOrderPriority = 1 )]
	public class VirtualTextureObject : TexturePropertyNode
	{
		protected const string VirtualPresetStr = "Layout Preset";
		protected const string VirtualChannelStr = "Virtual Layer";

		private const string VirtualTextureObjectInfo = "Can only be used alongside a Texture Sample node by connecting to its Tex Input Port.\n" +
														"\nProperty name must match the value set on your Virtual Texture.\n" +
														"Default e.g Albedo = _MainTex\n" +
														"\nName your node according to the respective channel property in your Virtual Texture. The Albedo must be set to _MainTex ( temporary requirement ).";
		private readonly string[] ChannelTypeStr = {
			"Albedo - D.RGBA",
			"Base - D.RGBA",
			"Normal - N.GA",
			"Height - N.B",
			"Occlusion - N.R",
			"Displacement - N.B",
			"Specular - S.RGBA",
			"Specular|Metallic - S.RGBA",
			"Material - S.RGBA",};

		private readonly string[] Dummy = { string.Empty };
		private string[] m_channelTypeStr;

		[SerializeField]
		protected VirtualPreset m_virtualPreset = VirtualPreset.Unity5;

		[SerializeField]
		protected VirtualChannel m_virtualChannel = VirtualChannel.Albedo;

		[SerializeField]
		private int m_selectedChannelInt = 0;

		protected override void CommonInit( int uniqueId )
		{
			base.CommonInit( uniqueId );
			ChangeChannels();
		}

		protected override void OnUniqueIDAssigned()
		{
			base.OnUniqueIDAssigned();
			if ( UniqueId != -1 )
				UIUtils.AddVirtualTextureCount();
		}

		public override void DrawSubProperties()
		{
			ShowDefaults();

			base.DrawSubProperties();
		}

		public override void DrawMaterialProperties()
		{
			ShowDefaults();

			base.DrawMaterialProperties();
		}

		new void ShowDefaults()
		{
			EditorGUI.BeginChangeCheck();
			m_virtualPreset = ( VirtualPreset ) EditorGUILayoutEnumPopup( VirtualPresetStr, m_virtualPreset );
			if ( EditorGUI.EndChangeCheck() )
			{
				ChangeChannels();
			}

			EditorGUI.BeginChangeCheck();
			m_selectedChannelInt = EditorGUILayoutPopup( VirtualChannelStr, m_selectedChannelInt, m_channelTypeStr );
			if ( EditorGUI.EndChangeCheck() )
			{
				m_virtualChannel = GetChannel( m_selectedChannelInt );
			}
		}

		public override void DrawProperties()
		{
			base.DrawProperties();
			EditorGUILayout.HelpBox( VirtualTextureObjectInfo, MessageType.Info );
		}

		private VirtualChannel GetChannel( int popupInt )
		{
			int remapInt = 0;
			switch ( m_virtualPreset )
			{
				case VirtualPreset.Unity_Legacy:
				remapInt = popupInt == 0 ? 1 : popupInt == 1 ? 2 : popupInt == 2 ? 4 : popupInt == 3 ? 5 : 0;
				break;
				default:
				case VirtualPreset.Unity5:
				case VirtualPreset.UBER:
				remapInt = popupInt == 0 ? 0 : popupInt == 1 ? 7 : popupInt == 2 ? 2 : popupInt == 3 ? 3 : popupInt == 4 ? 4 : 0;
				break;
				case VirtualPreset.Alloy:
				remapInt = popupInt == 0 ? 1 : popupInt == 1 ? 2 : popupInt == 2 ? 8 : popupInt == 3 ? 3 : 0;
				break;
				case VirtualPreset.Skyshop:
				case VirtualPreset.Lux:
				remapInt = popupInt == 0 ? 1 : popupInt == 1 ? 2 : popupInt == 2 ? 6 : 0;
				break;
			}

			return ( VirtualChannel ) remapInt;
		}

		private void ChangeChannels()
		{
			m_channelTypeStr = Dummy;
			switch ( m_virtualPreset )
			{
				case VirtualPreset.Unity_Legacy:
				m_channelTypeStr = new string[] { ChannelTypeStr[ 1 ], ChannelTypeStr[ 2 ], ChannelTypeStr[ 4 ], ChannelTypeStr[ 5 ] };
				break;
				default:
				case VirtualPreset.Unity5:
				case VirtualPreset.UBER:
				m_channelTypeStr = new string[] { ChannelTypeStr[ 0 ], ChannelTypeStr[ 7 ], ChannelTypeStr[ 2 ], ChannelTypeStr[ 3 ], ChannelTypeStr[ 4 ] };
				break;
				case VirtualPreset.Alloy:
				m_channelTypeStr = new string[] { ChannelTypeStr[ 1 ], ChannelTypeStr[ 2 ], ChannelTypeStr[ 8 ], ChannelTypeStr[ 3 ] };
				break;
				case VirtualPreset.Skyshop:
				case VirtualPreset.Lux:
				m_channelTypeStr = new string[] { ChannelTypeStr[ 1 ], ChannelTypeStr[ 2 ], ChannelTypeStr[ 6 ] };
				break;
			}
		}

		public override string GenerateShaderForOutput( int outputId, ref MasterNodeDataCollector dataCollector, bool ignoreLocalVar )
		{
			base.GenerateShaderForOutput( outputId, ref dataCollector, ignoreLocalVar );
			dataCollector.AddToProperties( UniqueId, "[HideInInspector] _VTInfoBlock( \"VT( auto )\", Vector ) = ( 0, 0, 0, 0 )", -1 );

			return PropertyName;
		}

		public override string GetPropertyValue()
		{
			string propertyValue = string.Empty;
			switch ( m_virtualChannel )
			{
				default:
				case VirtualChannel.Albedo:
				case VirtualChannel.Base:
				propertyValue = PropertyName + "(\"" + m_propertyInspectorName + "\", 2D) = \"" + m_defaultTextureValue + "\" {}";
				break;
				case VirtualChannel.Normal:
				propertyValue = PropertyName + "(\"" + m_propertyInspectorName + "\", 2D) = \"" + m_defaultTextureValue + "\" {}";
				break;
				case VirtualChannel.SpecMet:
				propertyValue = PropertyName + "(\"" + m_propertyInspectorName + "\", 2D) = \"" + m_defaultTextureValue + "\" {}";
				break;
			}
			return PropertyAttributes + propertyValue;
		}

		public override string GetUniformValue()
		{
			return "uniform sampler2D " + PropertyName + ";";
		}

		public override bool GetUniformData( out string dataType, out string dataName )
		{
			dataType = "sampler2D";
			dataName = PropertyName;
			return true;
		}

		public override void ReadFromString( ref string[] nodeParams )
		{
			base.ReadFromString( ref nodeParams );
			string defaultTextureGUID = GetCurrentParam( ref nodeParams );
			//m_defaultValue = AssetDatabase.LoadAssetAtPath<Texture>( textureName );
			if( UIUtils.CurrentShaderVersion() > 14101 )
			{
				m_defaultValue = AssetDatabase.LoadAssetAtPath<Texture>( AssetDatabase.GUIDToAssetPath( defaultTextureGUID ) );
				string materialTextureGUID = GetCurrentParam( ref nodeParams );
				m_materialValue = AssetDatabase.LoadAssetAtPath<Texture>( AssetDatabase.GUIDToAssetPath( materialTextureGUID ) );
			}
			else
			{
				m_defaultValue = AssetDatabase.LoadAssetAtPath<Texture>( defaultTextureGUID );
			}
			m_isNormalMap = Convert.ToBoolean( GetCurrentParam( ref nodeParams ) );
			m_defaultTextureValue = ( TexturePropertyValues ) Enum.Parse( typeof( TexturePropertyValues ), GetCurrentParam( ref nodeParams ) );
			m_autocastMode = ( AutoCastType ) Enum.Parse( typeof( AutoCastType ), GetCurrentParam( ref nodeParams ) );
			m_virtualPreset = ( VirtualPreset ) Enum.Parse( typeof( VirtualPreset ), GetCurrentParam( ref nodeParams ) );
			m_selectedChannelInt = Convert.ToInt32( GetCurrentParam( ref nodeParams ) );
			ChangeChannels();
			m_virtualChannel = GetChannel( m_selectedChannelInt );

			//m_forceNodeUpdate = true;

			//ConfigFromObject( m_defaultValue );
			if( m_materialValue == null )
			{
				ConfigFromObject( m_defaultValue );
			}
			else
			{
				CheckTextureImporter( true, true );
			}
			ConfigureInputPorts();
			ConfigureOutputPorts();
		}

		public override void ReadAdditionalData( ref string[] nodeParams ) { }

		public override void WriteToString( ref string nodeInfo, ref string connectionsInfo )
		{
			base.WriteToString( ref nodeInfo, ref connectionsInfo );
			//IOUtils.AddFieldValueToString( ref nodeInfo, ( m_defaultValue != null ) ? AssetDatabase.GetAssetPath( m_defaultValue ) : Constants.NoStringValue );
			IOUtils.AddFieldValueToString( ref nodeInfo, ( m_defaultValue != null ) ? AssetDatabase.AssetPathToGUID( AssetDatabase.GetAssetPath( m_defaultValue ) ) : Constants.NoStringValue );
			IOUtils.AddFieldValueToString( ref nodeInfo, ( m_materialValue != null ) ? AssetDatabase.AssetPathToGUID( AssetDatabase.GetAssetPath( m_materialValue ) ) : Constants.NoStringValue );

			IOUtils.AddFieldValueToString( ref nodeInfo, m_isNormalMap.ToString() );
			IOUtils.AddFieldValueToString( ref nodeInfo, m_defaultTextureValue );
			IOUtils.AddFieldValueToString( ref nodeInfo, m_autocastMode );
			IOUtils.AddFieldValueToString( ref nodeInfo, m_virtualPreset );
			IOUtils.AddFieldValueToString( ref nodeInfo, m_selectedChannelInt );
		}

		public override void WriteAdditionalToString( ref string nodeInfo, ref string connectionsInfo ) { }

		//public override string PropertyName
		//{
		//	get
		//	{
		//		string propertyName = string.Empty;
		//		switch ( m_virtualChannel )
		//		{
		//			default:
		//			case VirtualChannel.Albedo:
		//			case VirtualChannel.Base:
		//				propertyName = "_MainTex";
		//				break;
		//			case VirtualChannel.Normal:
		//				propertyName = "_BumpMap";
		//				break;
		//			case VirtualChannel.SpecMet:
		//				propertyName = "_MetallicGlossMap";
		//				break;
		//			case VirtualChannel.Occlusion:
		//				propertyName = "_OcclusionMap";
		//				break;
		//		}
		//		return propertyName;
		//	}
		//}

		public override void Destroy()
		{
			base.Destroy();
			UIUtils.RemoveVirtualTextureCount();
		}

		public override bool IsNormalMap { get { return m_isNormalMap || m_virtualChannel == VirtualChannel.Normal; } }
		public VirtualChannel Channel { get { return m_virtualChannel; } }
	}
}