using UnityEngine;
using System.Collections;

public class AI : MonoBehaviour {

    private Transform mainUFO;
    public GameObject laserBeam;
    public float turnSpeed = 5f;
    public float shootingForce = 20000f;
    public float hookDistance = 5f;
    public bool inDelay;
    public float speed = 10f;
    RaycastHit hit;
    Rigidbody rb;
    AudioSource audioSource;

    void Start()
    {
        mainUFO = GameObject.FindGameObjectWithTag("mainUFO").transform;
        audioSource = GetComponent<AudioSource>();
        inDelay = false;
    }

    void FixedUpdate ()
    {
        float maxDistance = Vector3.Distance(mainUFO.transform.position, transform.position);

        if (!inDelay)
        {
            Quaternion targetRotation = Quaternion.LookRotation(mainUFO.transform.position - transform.position);
            transform.rotation = Quaternion.Slerp(transform.rotation, targetRotation, turnSpeed * Time.fixedDeltaTime);

            if (maxDistance >= 30)
            {
                transform.position = Vector3.MoveTowards(transform.position, mainUFO.transform.position, Time.fixedDeltaTime * speed);
            }
        }

        if (Vector3.Angle(transform.forward, mainUFO.transform.position - transform.position) < hookDistance)
        {
            if (!inDelay)
            {
                StartCoroutine(shootingDelay());
            }
        }
    }

    IEnumerator shootingDelay ()
    {
        inDelay = true;
        yield return new WaitForSeconds(1);

        Transform shootingStart = gameObject.transform.GetChild(1);
        GameObject newLaserBeam = Instantiate(laserBeam, new Vector3(shootingStart.transform.position.x, shootingStart.transform.position.y, shootingStart.transform.position.z), shootingStart.transform.rotation) as GameObject;

        rb = newLaserBeam.GetComponent<Rigidbody>();
        rb.AddForce(transform.forward * shootingForce);
        audioSource.Play();

        if (Vector3.Angle(transform.forward, mainUFO.transform.position - transform.position) < hookDistance)
        {
            print("hit!");
        }

        yield return new WaitForSeconds(1);
        inDelay = false;
        Object.Destroy(newLaserBeam);
    }

}