using UnityEngine;

// This is an instance for a point cache modifier, will simply use data from a base mesh with
// a point cache on to build new mesh data
public class MegaPointCacheInstance : MonoBehaviour
{
	[HideInInspector]
	public MegaPointCache	mod;
	[HideInInspector]
	public MegaModifyObject	modobj;

	public GameObject		obj;
	[HideInInspector]
	public Mesh				mesh;
	public float			time		= 0.0f;		// Animation time
	public float			speed		= 1.0f;		// Speed of animation playback
	public int				updateRate	= 0;		// update rate of mesh, 0 is every frame 1 every other etc
	public int				frame		= 0;		// current frame, can be used to stagger updates
	public bool				recalcNorms = true;		// recalc normals
	public bool				recalcBounds = true;	// recalc bounds

	// Call this to set the source game object which has the working point cache modifier attached
	public void SetSource(GameObject srcobj)
	{
		if ( srcobj )
		{
			if ( mesh == null )
				mesh = MegaUtils.GetMesh(gameObject);

			Mesh srcmesh = MegaUtils.GetMesh(srcobj);

			if ( srcmesh.vertexCount == mesh.vertexCount )
			{
				obj		= srcobj;
				mod		= (MegaPointCache)srcobj.GetComponent<MegaPointCache>();
				modobj	= (MegaModifyObject)srcobj.GetComponent<MegaModifyObject>();
				mesh	= MegaUtils.GetMesh(gameObject);
			}
		}
	}

	void Update()
	{
		if ( mod && modobj && mesh )
		{
			if ( Application.isPlaying )
				time += Time.deltaTime * speed;

			frame--;
			if ( frame < 0 )
			{
				frame = updateRate;

				mod.ModifyInstance(modobj, time);

				mesh.vertices = mod.sverts;

				if ( recalcNorms )
					mesh.RecalculateNormals();

				if ( recalcBounds )
					mesh.RecalculateBounds();
			}
		}
	}
}