using UnityEngine;
using System.Collections;

public class Bullet : MapObject 
{

	public int id;
	public string path;
	public float damage;
	public float speed = 0;
	public float speedAcc = 40f;
	public float maxSpeed = 20f;

	protected float startTime;
	protected ITarget target;
	protected Power power;
	protected Vector3 lastTargetPosition;

	public Transform shotTrans;

	public virtual void Init(Map map, Vector3 position, ITarget target, Power power)
	{
		this.map = map;
		this.target = target;
		this.power = power;

		this.transform.position = position;

		InitRotation();
	}

	public virtual void Reset()
	{
		startTime = GameTime.time;

		BulletSettings settings = GetComponent<BulletSettings>();
		if(settings != null)
		{
			speed = settings.speed;
			speedAcc = settings.speedAcc;
			maxSpeed = settings.maxSpeed;
		}
	}

	public IPowerOwner GetOwner()
	{
		return power.GetOwner();
	}

	public Power GetPower()
	{
		return power;
	}

	public virtual void InitRotation()
	{
		if(target == null)
			return;

		Vector3 targetPos = target.position;
		float theta = NumberUtil.getRadianByATan(this.transform.position.x, this.transform.position.z, targetPos.x, targetPos.z);
		
		//updatae rotation
		float rotateAngle = -NumberUtil.radianToAngle(theta);
		Vector3 eulerAngles = transform.eulerAngles;
		eulerAngles.y = rotateAngle;
		transform.eulerAngles = eulerAngles;
	}

	// Update is called once per frame
	public virtual void Update () 
	{
		if(target != null && !target.IsDead())
		{
			lastTargetPosition = target.position;
		}
		if(lastTargetPosition == Vector3.zero)
			Remove();

		float theta = NumberUtil.getRadianByATan(lastTargetPosition.x, lastTargetPosition.z, this.transform.position.x, this.transform.position.z);

		//updatae rotation
		float rotateAngle = -NumberUtil.radianToAngle(theta);
		Vector3 eulerAngles = transform.eulerAngles;
		eulerAngles.y = rotateAngle;
		transform.eulerAngles = eulerAngles;


		//update position
		speed += speedAcc*GameTime.deltaTime;
		if(speed > maxSpeed)
		{
			speed = maxSpeed;
		}

		float movDistance = Mathf.Abs(speed)*GameTime.deltaTime;

		float distance = 0;

		distance = NumberUtil.distanceVector2(new Vector2(transform.position.x, transform.position.z), new Vector2(lastTargetPosition.x, lastTargetPosition.z));

		if(distance < movDistance)
		{
			MakeDamage();
		}
		else
		{
			float movX = movDistance*Mathf.Cos(theta);
			float movY = movDistance*Mathf.Sin(theta);

			Vector3 position = transform.position;
			position.x += movX;
			position.z += movY;
			transform.position = position;
		}
	}

	protected virtual void MakeDamage()
	{
		DoDamage(target);
		Remove();
	}

	protected virtual void DoDamage(ITarget target)
	{
		if(target == null || target.IsDead())
		{
			return;
		}

		if(power.GetPowerEffect() == Power.PowerEffect.Damage)
			target.MakeDamage(this);
		else
			target.MakeHeal(this);

		if(!StringUtil.Empty(power.GetHitEffect()))
		{
			GameObject hitEffect = EffectUtil.CreateEffect(power.GetHitEffect());
			if(hitEffect != null)
			{
				hitEffect.SetActive(false);
				HitEffectSettings settings = hitEffect.GetComponent<HitEffectSettings>();
				if(settings == null)
				{
					Vector3 heartPos = target.heartPos;
					heartPos.x += Random.Range(-0.5f, 0.5f);
					heartPos.z += Random.Range(-0.5f, 0.5f);
					hitEffect.transform.position = target.heartPos;
					hitEffect.SetActive(true);
				}
				else
				{
					if(settings.isLocal)
					{
						GameObject targetObj = (target as Component).gameObject;
						hitEffect.transform.SetParent(targetObj.transform);
						hitEffect.transform.localPosition = settings.originPos;
						hitEffect.transform.eulerAngles = Vector3.zero;
					}
					hitEffect.SetActive(true);
				}
			}

			power.PlayHitSound();
		}

		if(power.GetBuff() > 0)
			BuffManager.GetInstance().AddBuff(power.GetBuff(), target as BattleObject, power.GetOwner() as BattleObject);
	}

	public override void Remove ()
	{
		BulletFactory.Recycle(path, this.gameObject);
	}

	public override string ToString ()
	{
		return string.Format ("[Bullet] "+power.ToString());
	}
}