using UnityEngine;
using System.Collections;

public class Invisibler : MonoBehaviour
{

	private float targetAlpha;
	private bool increase;
	private float speed = 1f;

	private Renderer[] rendererArr;
	private Material material;

	// Use this for initialization
	void Start ()
	{
		Craft craft = GetComponent<Craft>();
		if(craft.topPartTrans != null)
		{
			Renderer[] topRenderers = craft.topPartTrans.GetComponentsInChildren<SkinnedMeshRenderer>();
			Renderer[] bottomRenderers = craft.bottomPartTrans.GetComponentsInChildren<SkinnedMeshRenderer>();
			rendererArr = new Renderer[topRenderers.Length + bottomRenderers.Length];
			for(int i=0; i<topRenderers.Length; i++)
			{
				rendererArr[i] = topRenderers[i];
			}
			for(int i=0; i<bottomRenderers.Length; i++)
			{
				rendererArr[topRenderers.Length + i] = bottomRenderers[i];
			}
		}
		else
		{
			rendererArr = craft.bodyTrans.GetComponentsInChildren<SkinnedMeshRenderer>();
		}
		material = Instantiate<Material>(Resources.Load<Material> (Config.SHADOW_MATERIAL));
		material.mainTexture = rendererArr[0].material.mainTexture;
		for(int i=0; i<rendererArr.Length; i++)
		{
			rendererArr[i].material = material;
		}
	}
	
	// Update is called once per frame
	void Update ()
	{
		bool allDone = true;

		Color color = material.color;
		float value = speed * GameTime.deltaTime;
		if(increase)
		{
			color.a += value;
			if(color.a >= targetAlpha)
			{
				color.a = targetAlpha;
				Craft craft = GetComponent<Craft>();
				for(int i=0; i<rendererArr.Length; i++)
				{
					rendererArr[i].material = craft.material;
				}
			}
			else
			{
				allDone = false;
			}
		}
		else
		{
			color.a -= value;
			if(color.a <= targetAlpha)
			{
				color.a = targetAlpha;
			}
			else
			{
				allDone = false;
			}
		}

		material.color = color;

		if(allDone)
		{
			Destroy(this);
		}
	}

	public static void Start(BattleObject battleObj, float alpha, bool increase)
	{
		Invisibler inv = battleObj.gameObject.AddComponent<Invisibler>();
		inv.targetAlpha = alpha;
		inv.increase = increase;
	}
}