using UnityEngine;
using System.Collections;

public class ChainBullet : Bullet {

	public float delayEffect = 0.2f;
	public float delayRemove = 1f;

	private bool effected = false;

	public ITarget origin;
	private Vector3 lastOriginPosition;

	public Transform muzzleTrans;
	public Transform flareTrans;

	public bool AnimateUV = true;          // UV Animation
	public float UVTime;

	public float Amplitude = 0.3f;
	public Texture[] beamFrames;

	float initialBeamOffset;
	float beamLength;

	public LineRenderer lineRenderer;

	void Awake()
	{
		muzzleTrans = transform.FindChild("Muzzle");
		flareTrans = transform.FindChild("Flare");
		lineRenderer = GetComponent<LineRenderer>();

		BulletSettings bulletSettings = GetComponent<BulletSettings>();
		if(bulletSettings != null)
		{
			beamFrames = bulletSettings.beamFrames;
		}

		Reset ();
	}

	public override void Reset ()
	{
		base.Reset ();
		initialBeamOffset = Random.Range(0f, 5f);
		effected = false;
	}

	public override void InitRotation ()
	{

	}

	override public void Update () 
	{
		if(target != null && !target.IsDead())
		{
			lastTargetPosition = target.heartPos;
		}
		if(origin != null && !origin.IsDead())
		{
			if(shotTrans != null)
				lastOriginPosition = shotTrans.position;
			else
				lastOriginPosition = origin.heartPos;
		}

		if(lastTargetPosition == Vector3.zero || lastOriginPosition == Vector3.zero)
			Remove();

		UpdateLineRenderer();
//		float theta = NumberUtil.getRadianByATan(lastTargetPosition.x, lastTargetPosition.z, lastOriginPosition.x, lastOriginPosition.z);
//		float distance = NumberUtil.distanceVector2(new Vector2(lastTargetPosition.x, lastTargetPosition.z), new Vector2(lastOriginPosition.x, lastOriginPosition.z));
//		
//		//updatae rotation
//		float rotateAngle = -NumberUtil.radianToAngle(theta);
//		Vector3 eulerAngles = transform.eulerAngles;
//		eulerAngles.y = rotateAngle;
//		transform.eulerAngles = eulerAngles;
//
//		transform.localScale = new Vector3(distance, 1f, 1f);
//
//		Vector3 position = new Vector3();
//		position.x = (lastTargetPosition.x+lastOriginPosition.x)/2f;
//		position.y = 1f;
//		position.z = (lastTargetPosition.z+lastOriginPosition.z)/2f;
//		transform.position = position;

		float deltaTime = GameTime.time-startTime;
		if(!effected && deltaTime >= delayEffect)
		{
			DoDamage(target);
			effected = true;
		}
		else if(deltaTime >= delayRemove)
		{
			Remove();
		}
	}


	private void UpdateLineRenderer()
	{
		transform.position = lastOriginPosition;
		muzzleTrans.position = lastOriginPosition;
		flareTrans.position = lastTargetPosition;

		lineRenderer.material.SetTextureOffset("_MainTex", new Vector2(GameTime.time * UVTime + initialBeamOffset, 0f));

		// Process raycasting 
		OnOscillate();
		OnFrameStep();
	}

	void OnOscillate()
	{   
		lineRenderer.SetVertexCount(2);
		lineRenderer.SetPosition(0, new Vector3(0, 0, 0));
		float x = lastTargetPosition.x - lastOriginPosition.x;
		float z = lastTargetPosition.z - lastOriginPosition.z;
		lineRenderer.SetPosition(1, new Vector3(x, 0, z));
	}

	float GetRandomNoise()
	{
		return Random.Range(-Amplitude, Amplitude);
	}

	void OnFrameStep()
	{
		if(beamFrames == null)
			return;

		int frameNo = Random.Range(0, beamFrames.Length);
		lineRenderer.material.mainTexture = beamFrames[frameNo];
	}

}