//
// DrawSceneObject.cs
//
// Dynamic Shadow Projector
//
// Copyright 2015 NYAHOON GAMES PTE. LTD. All Rights Reserved.
//

using UnityEngine;
using System.Collections;

namespace DynamicShadowProjector {
	[ExecuteAlways]
	[DisallowMultipleComponent]
	[RequireComponent(typeof(ShadowTextureRenderer))]
	public class DrawSceneObject : MonoBehaviour {
		// serialize fields
		[SerializeField]
		private Shader m_replacementShader;
		[SerializeField]
		private LayerMask m_cullingMask;

		// public property
		public Shader replacementShader
		{
			get { return m_replacementShader; }
			set	{
				m_replacementShader = value;
				shadowTextureRenderer.SetReplacementShader(m_replacementShader, "RenderType");
			}
		}
		public LayerMask cullingMask
		{
			get { return m_cullingMask; }
			set {
				m_cullingMask = value;
				if (shadowTextureRenderer.isProjectorVisible) {
					shadowTextureRenderer.cameraCullingMask = value;
				}
			}
		}

		private ShadowTextureRenderer m_shadowTextureRenderer;
		public ShadowTextureRenderer shadowTextureRenderer
		{
			get {
				if (m_shadowTextureRenderer == null) {
					m_shadowTextureRenderer = GetComponent<ShadowTextureRenderer>();
				}
				return m_shadowTextureRenderer;
			}
		}

		void OnValidate()
		{
			shadowTextureRenderer.SetReplacementShader(m_replacementShader, "RenderType");
			if (shadowTextureRenderer.isProjectorVisible) {
				shadowTextureRenderer.cameraCullingMask = m_cullingMask;
			}
		}

		void OnEnable()
		{
			shadowTextureRenderer.cameraCullingMask = m_cullingMask;
			shadowTextureRenderer.SetReplacementShader(m_replacementShader, "RenderType");
		}

		void OnDisable()
		{
			shadowTextureRenderer.cameraCullingMask = 0;
			shadowTextureRenderer.SetReplacementShader(null, null);
		}

		void OnVisibilityChanged(bool isVisible)
		{
			if (isVisible) {
				shadowTextureRenderer.cameraCullingMask = m_cullingMask;
			}
			else {
				shadowTextureRenderer.cameraCullingMask = 0;
			}
		}
	}
}