// Amplify Shader Editor - Visual Shader Editing Tool
// Copyright (c) Amplify Creations, Lda <info@amplify.pt>
//
// Custom Node If
// Donated by The Four Headed Cat - @fourheadedcat

using UnityEngine;
using System;

namespace AmplifyShaderEditor
{
	[Serializable]
	[NodeAttributes( "If [Community]", "Logical Operators", "Compare A with B. If A is greater than B output the value of A > B port. If A is equal to B output the value of A == B port. If A is lower than B output the value of A < B port. Equal Threshold parameter will be used to check A == B adding and subtracting this value to A.", null, KeyCode.None, true, false, null, null, "The Four Headed Cat - @fourheadedcat" )]
	public sealed class TFHCIf : ParentNode
	{
		private WirePortDataType m_inputMainDataType = WirePortDataType.FLOAT;
		private WirePortDataType m_outputMainDataType = WirePortDataType.FLOAT;

		protected override void CommonInit( int uniqueId )
		{
			base.CommonInit( uniqueId );
			AddInputPort( WirePortDataType.FLOAT, false, "A" );
			AddInputPort( WirePortDataType.FLOAT, false, "B" );
			AddInputPort( WirePortDataType.FLOAT, false, "A > B" );
			AddInputPort( WirePortDataType.FLOAT, false, "A == B" );
			AddInputPort( WirePortDataType.FLOAT, false, "A < B" );
			AddInputPort( WirePortDataType.FLOAT, false, "Equal Threshold" );
			AddOutputPort( WirePortDataType.FLOAT, Constants.EmptyPortValue );
			m_textLabelWidth = 110;
			m_useInternalPortData = true;
			m_previewShaderGUID = "5c7bc7e3cab81da499e4864ace0d86c5";
		}

		public override void OnConnectedOutputNodeChanges( int inputPortId, int otherNodeId, int otherPortId, string name, WirePortDataType type )
		{
			base.OnConnectedOutputNodeChanges( inputPortId, otherNodeId, otherPortId, name, type );
			UpdateConnection( inputPortId );
		}

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

		public override void OnInputPortDisconnected( int portId )
		{
			UpdateConnection( portId );
		}

		void TestMainInputDataType()
		{
			WirePortDataType newType = WirePortDataType.FLOAT;
			if( m_inputPorts[ 0 ].IsConnected && UIUtils.GetPriority( m_inputPorts[ 0 ].DataType ) > UIUtils.GetPriority( newType ) )
			{
				newType = m_inputPorts[ 0 ].DataType;
			}

			if( m_inputPorts[ 1 ].IsConnected && ( UIUtils.GetPriority( m_inputPorts[ 1 ].DataType ) > UIUtils.GetPriority( newType ) ) )
			{
				newType = m_inputPorts[ 1 ].DataType;
			}

			if( m_inputPorts[ 5 ].IsConnected && ( UIUtils.GetPriority( m_inputPorts[ 5 ].DataType ) > UIUtils.GetPriority( newType ) ) )
			{
				newType = m_inputPorts[ 5 ].DataType;
			}

			m_inputMainDataType = newType;
		}

		void TestMainOutputDataType()
		{
			WirePortDataType newType = WirePortDataType.FLOAT;
			for( int i = 2; i < 5; i++ )
			{
				if( m_inputPorts[ i ].IsConnected && ( UIUtils.GetPriority( m_inputPorts[ i ].DataType ) > UIUtils.GetPriority( newType ) ) )
				{
					newType = m_inputPorts[ i ].DataType;
				}
			}

			if( newType != m_outputMainDataType )
			{
				m_outputMainDataType = newType;
				m_outputPorts[ 0 ].ChangeType( m_outputMainDataType, false );
			}
		}

		public void UpdateConnection( int portId )
		{
			m_inputPorts[ portId ].MatchPortToConnection();
			switch( portId )
			{
				case 0:
				case 1:
				case 5:
				{
					TestMainInputDataType();
				}
				break;
				case 2:
				case 3:
				case 4:
				{
					TestMainOutputDataType();
				}
				break;
			}
		}

		public override string GenerateShaderForOutput( int outputId, ref MasterNodeDataCollector dataCollector, bool ignoreLocalvar )
		{
			string a = m_inputPorts[ 0 ].GenerateShaderForOutput( ref dataCollector, m_inputMainDataType, ignoreLocalvar, true );
			string b = m_inputPorts[ 1 ].GenerateShaderForOutput( ref dataCollector, m_inputMainDataType, ignoreLocalvar, true );
			string r1 = m_inputPorts[ 2 ].GenerateShaderForOutput( ref dataCollector, m_outputMainDataType, ignoreLocalvar, true );
			string r2 = m_inputPorts[ 3 ].GenerateShaderForOutput( ref dataCollector, m_outputMainDataType, ignoreLocalvar, true );
			string r3 = m_inputPorts[ 4 ].GenerateShaderForOutput( ref dataCollector, m_outputMainDataType, ignoreLocalvar, true );
			string tr = m_inputPorts[ 5 ].GenerateShaderForOutput( ref dataCollector, m_inputMainDataType, ignoreLocalvar, true );

			// No Equal Threshold parameter
			//(a > b ? r1 : a == b ? r2 : r3 )      
			//string strout = " ( " + a + " > " + b  + " ? " + r1 + " : " + a + " == " + b + " ? " + r2 + " : " +  r3 + " ) ";

			// With Equal Threshold parameter
			// ( a - tr > b ? r1 : a - tr <= b && a + tr >= b ? r2 : r3 )
			string strout = " ( " + a + " - " + tr + " > " + b + " ? " + r1 + " : " + a + " - " + tr + " <= " + b + " && " + a + " + " + tr + " >= " + b + " ? " + r2 + " : " + r3 + " ) ";

			//Debug.Log( strout );
			return CreateOutputLocalVariable( 0, strout, ref dataCollector );
		}
	}
}