using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Bat : Enemy {

	private Rigidbody2D rB;
	private GameObject player;
	public float range;
	public float moveDelay;
	public float moveSpeed;
	public float knockbackPower;

	private bool canMove;

	// Use this for initialization
	public override void Start () {
		base.Start();

		rB = GetComponent<Rigidbody2D> ();
		canMove = true;
	}

	// Update is called once per frame
	public override void Update () {

		if (OnScreen) {
			base.Update();

			if (!player) {
				player = GameObject.FindGameObjectWithTag ("Player");
			} else {

			float distance = Vector2.Distance (transform.position, player.transform.position);

			if (distance < range && canMove) {
				Move ();

				canMove = false;
				StartCoroutine (MoveDelay ());
			}

		}
		}
		
	}

	void OnTriggerEnter2D(Collider2D other)
	{
		PlayerController player = other.gameObject.GetComponent<PlayerController> ();

		if (player && !getIsDead()) {
			player.GetHit (GetDamage(), transform.position, knockbackPower);
		}
	}

	void Move()
	{
		rB.AddForce (Vector3.Normalize(player.transform.position - transform.position) * moveSpeed, ForceMode2D.Impulse);
	}
		
	public override void Damage(float damageToDo, Vector3 hitPos, float knockback)
	{
		base.Damage(damageToDo, hitPos, knockback);
	}

	public override void Die()
	{
		base.Die ();
		GetComponent<PolygonCollider2D> ().enabled = false;
		GetComponent<Rigidbody2D> ().simulated = false;
	}

	public override void Respawn()
	{
		base.Respawn ();
		GetComponent<PolygonCollider2D> ().enabled = true;
		GetComponent<Rigidbody2D> ().simulated = true;
	}

	IEnumerator MoveDelay()
	{
		yield return new WaitForSeconds (moveDelay);
		canMove = true;
	}
}