using UnityEngine;
using System.Collections;

[ExecuteInEditMode]
public class SkeletonUtilitySubmeshRenderer : MonoBehaviour {

	public Renderer parentRenderer;

	[System.NonSerialized]
	public Mesh mesh;

	public int submeshIndex = 0;
	public int sortingOrder = 0;
	public int sortingLayerID = 0;

	public Material hiddenPassMaterial;
	Renderer cachedRenderer;
	MeshFilter filter;
	Material[] sharedMaterials;
	MeshFilter parentFilter;

	void Awake(){
		cachedRenderer = renderer;
		sharedMaterials = cachedRenderer.sharedMaterials;
		filter = GetComponent<MeshFilter>();

		if(parentRenderer != null)
			Initialize( parentRenderer );
	}

	void OnEnable(){
		parentRenderer = transform.parent.GetComponent<Renderer>();
		parentRenderer.GetComponent<SkeletonRenderer>().OnReset += HandleSkeletonReset;
	}

	void OnDisable(){
		parentRenderer.GetComponent<SkeletonRenderer>().OnReset -= HandleSkeletonReset;
	}

	void HandleSkeletonReset(SkeletonRenderer r){
		if(parentRenderer != null)
			Initialize(parentRenderer);
	}

	public void Initialize(Renderer parentRenderer){
		this.parentRenderer = parentRenderer;
		parentFilter = parentRenderer.GetComponent<MeshFilter>();
		mesh = parentFilter.sharedMesh;
		filter.sharedMesh = mesh;
	}

	public void Update(){
		if(mesh == null || mesh != parentFilter.sharedMesh){
			mesh = parentFilter.sharedMesh;
			filter.sharedMesh = mesh;
		}

		if(cachedRenderer == null)
			cachedRenderer = renderer;

		if(mesh == null || submeshIndex > mesh.subMeshCount - 1){
			cachedRenderer.enabled = false;
			return;
		}
		else{
			renderer.enabled = true;
		}

		bool changed = false;

		if(sharedMaterials.Length != parentRenderer.sharedMaterials.Length){
			sharedMaterials = parentRenderer.sharedMaterials;
			changed = true;
		}



		for(int i = 0; i < renderer.sharedMaterials.Length; i++){
			if(i == submeshIndex)
				continue;

			if(sharedMaterials[i] != hiddenPassMaterial){
				sharedMaterials[i] = hiddenPassMaterial;
				changed = true;
			}
		}

		if(sharedMaterials[submeshIndex] != parentRenderer.sharedMaterials[submeshIndex]){
			sharedMaterials[submeshIndex] = parentRenderer.sharedMaterials[submeshIndex];
			changed = true;
		}

		if(changed){
			cachedRenderer.sharedMaterials = sharedMaterials;
		}


		cachedRenderer.sortingLayerID = sortingLayerID;
		cachedRenderer.sortingOrder = sortingOrder;
	}
}
