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

using UnityEngine;
using System;

namespace AmplifyShaderEditor
{
	[Serializable]
	[NodeAttributes( "Rotator", "UV Coordinates", "Rotates UVs or any Vector2 value from an Anchor point for a specified Time value")]
	public sealed class RotatorNode : ParentNode
	{
		private int m_cachedUsingEditorId = -1;

		protected override void CommonInit( int uniqueId )
		{
			base.CommonInit( uniqueId );
			AddInputPort( WirePortDataType.FLOAT2, false, "UV" );
			AddInputPort( WirePortDataType.FLOAT2, false, "Anchor" );
			AddInputPort( WirePortDataType.FLOAT, false, "Time" );
			AddOutputPort( WirePortDataType.FLOAT2, "Out" );
			m_useInternalPortData = true;
			m_inputPorts[ 2 ].FloatInternalData = 1;
			m_textLabelWidth = 50;
			m_previewShaderGUID = "e21408a1c7f12f14bbc2652f69bce1fc";
		}

		public override void SetPreviewInputs()
		{
			base.SetPreviewInputs();

			if ( m_cachedUsingEditorId == -1 )
				m_cachedUsingEditorId = Shader.PropertyToID( "_UsingEditor" );

			PreviewMaterial.SetFloat( m_cachedUsingEditorId, (m_inputPorts[ 2 ].IsConnected ? 0 : 1 ) );
		}

		public override void OnInputPortConnected( int portId, int otherNodeId, int otherPortId, bool activateNode = true )
		{
			base.OnInputPortConnected( portId, otherNodeId, otherPortId, activateNode );
			if( portId == 2 )
			{
				m_continuousPreviewRefresh = false;
			}
		}

		public override void OnInputPortDisconnected( int portId )
		{
			base.OnInputPortDisconnected( portId );
			if( portId == 2 )
			{
				m_continuousPreviewRefresh = true;
			}
		}


		public override string GenerateShaderForOutput( int outputId, ref MasterNodeDataCollector dataCollector, bool ignoreLocalvar )
		{
			if( m_outputPorts[ 0 ].IsLocalValue( dataCollector.PortCategory ) )
				return m_outputPorts[ 0 ].LocalValue( dataCollector.PortCategory );

			string result = string.Empty;
			string uv = m_inputPorts[ 0 ].GeneratePortInstructions( ref dataCollector );
			string anchor = m_inputPorts[ 1 ].GeneratePortInstructions( ref dataCollector );

			string time = m_inputPorts[ 2 ].GeneratePortInstructions( ref dataCollector );
			if ( !m_inputPorts[ 2 ].IsConnected )
			{
				if( !( dataCollector.IsTemplate && dataCollector.IsSRP ) )
					dataCollector.AddToIncludes( UniqueId, Constants.UnityShaderVariables );
				time += " * _Time.y";
			}

			result += uv;

			string cosVar = "cos" + OutputId;
			string sinVar = "sin" + OutputId;
			dataCollector.AddLocalVariable( UniqueId, "float " + cosVar + " = cos( "+time+" );");
			dataCollector.AddLocalVariable( UniqueId, "float " + sinVar + " = sin( "+time+" );");
			
			string value =  "mul( " + result + " - " + anchor + " , float2x2( "+cosVar+" , -"+sinVar+" , "+sinVar+" , "+cosVar+" )) + "+anchor;
			RegisterLocalVariable( 0, value, ref dataCollector, "rotator" + OutputId );

			return m_outputPorts[ 0 ].LocalValue( dataCollector.PortCategory );
		}

		public override void RefreshExternalReferences()
		{
			base.RefreshExternalReferences();
			if( UIUtils.CurrentShaderVersion() < 13107 )
			{
				m_inputPorts[ 2 ].FloatInternalData = 1;
			}
		}
	}
}