using System;
using System.Collections.Generic;
using UnityEngine;

namespace UnityEditor.Graphs.Material
{
	public abstract class PropertyNode : BaseMaterialNode, IGenerateProperties
	{
		[SerializeField]
		private ShaderProperty m_BoundProperty;

		public bool exposed
		{
			get { return m_BoundProperty != null; }
		}

		protected virtual bool HasBoundProperty() { return m_BoundProperty != null; }
		public ShaderProperty boundProperty { get { return m_BoundProperty; } }

		public virtual void BindProperty(ShaderProperty property, bool rebuildShaders)
		{
			m_BoundProperty = property;
		}

		public virtual void RefreshBoundProperty (ShaderProperty toRefresh, bool rebuildShader)
		{
			if (m_BoundProperty != null && m_BoundProperty == toRefresh)
			{
				BindProperty (toRefresh, rebuildShader);
			}
		}

		public IEnumerable<ShaderProperty> FindValidPropertyBindings()
		{
			if (graph is IGenerateGraphProperties)
				return (graph as IGenerateGraphProperties).GetPropertiesForPropertyType(propertyType);

			return new ShaderProperty[0];
		}

		public virtual string GetPropertyName()
		{
			if (m_BoundProperty == null)
				return name + "_" + Math.Abs(GetInstanceID());

			return m_BoundProperty.name;
		}

		public abstract PropertyType propertyType { get; }

		public abstract PreviewProperty GetPreviewProperty ();

		public override void UpdatePreviewProperties ( )
		{
			base.UpdatePreviewProperties ();
			MaterialWindow.DebugMaterialGraph ("In Property Node: " + this);
			SetDependentPreviewMaterialProperty (GetPreviewProperty ());
		}

		public void UnbindProperty (ShaderProperty prop)
		{
			if (m_BoundProperty != null && m_BoundProperty == prop)
			{
				m_BoundProperty = null;
				RegeneratePreviewShaders();
			}
		}
	}
}