using UnityEngine;
using System.Collections;

[RequireComponent(typeof(Rigidbody2D))]
public class MissileController : MonoBehaviour {


    public float speed = 1;
    public float initVelocity = 5;
    public float boostCoolDown = 0.3f;
    public float difficulty = 0.0f;
    public int totalBoosts = 2;

    public ParticleSystem boostEffect;
    public GameObject Explosion;

    [HideInInspector]
    public Vector3 startVelocity;
    [HideInInspector]
    public Vector3 targetPos;
    [HideInInspector]
    public GameObject target;
    [HideInInspector]
    public Rigidbody2D targetRigid;
    [HideInInspector]
    public Collider2D[] ignoreList;
    [HideInInspector]
    public InteractableObject spawningObject;

    private Rigidbody2D rigid;
    private float startTime = 0.0f;
    private int reCalibrate = 0;

	// Use this for initialization
	void Start () {
        DontDestroyOnLoad(gameObject);
        startTime = Time.time;

        Collider2D thisCollider = GetComponent<Collider2D>();
        if (thisCollider != null) {
            foreach (Collider2D collider in ignoreList) {
                Physics2D.IgnoreCollision(thisCollider, collider);
            }
        }

        rigid = GetComponent<Rigidbody2D>();
        rigid.velocity = startVelocity * initVelocity;
        Destroy(gameObject, boostCoolDown * totalBoosts + 1);
	}
	
	// Update is called once per frame
	void FixedUpdate () {

        if (Time.time - startTime >= boostCoolDown && reCalibrate < totalBoosts) {
            if (reCalibrate == 0) {
                if (target != null) {
                    targetPos = target.transform.position;
                }
            }
            if (target != null) {
                moveTorwards(target);
            }
            reCalibrate++;
            startTime = Time.time;
        }


	}

    private void moveTorwards(Vector3 pos) {

        if (boostEffect != null) {
            boostEffect.startRotation = transform.rotation.eulerAngles.z * Mathf.Deg2Rad;
            boostEffect.Play();
        }

        Vector2 direction = (pos - transform.position).normalized;
        Debug.DrawLine(transform.position, pos, Color.green,0.3f);
        rigid.velocity = direction * speed;
        //rigid.AddForce(direction * speed, ForceMode2D.Impulse);
    }

    private void moveTorwards(GameObject target) {
        if (target == null)
            return;

        if (targetRigid != null && reCalibrate == 1) {
            Debug.DrawLine(targetPos, target.transform.position, Color.blue, 0.3f);
            Vector2 pos =  Vector3.Lerp( targetPos,target.transform.position,difficulty);
            moveTorwards(pos);
            return;
        }


            moveTorwards(target.transform.position);

    }


    void OnCollisionEnter2D(Collision2D coll) {
        InteractableObject colScript = coll.gameObject.GetComponent<InteractableObject>();

        if (colScript == null || colScript == spawningObject ) {
           // Debug.Log("I ignored " + coll.gameObject.name);
            return;
        }

        //Debug.Log("I hit " + coll.gameObject.name);

        colScript.shot();
        if (Explosion != null) {
            GameObject explosion = (GameObject)Instantiate(Explosion, transform.position, transform.rotation);
            Destroy(explosion, 2.0f);
        }

        Destroy(this.gameObject);



    }



    }