using UnityEngine;

public class MoveProjectile : MonoBehaviour
{
    public float movementSpeed;
    public Transform startingPos;
    public Transform endingPos;
    private float startTime;
    private float journeyLength;
    public GameObject explosionParticles;
    public GameObject animatedProjectile;
    private GameObject lastProjectileAnim;
    private AudioSource aSource;

    private void Start()
    {
        startTime = Time.time;
        journeyLength = Vector3.Distance(startingPos.position, endingPos.position);
        aSource = GetComponent<AudioSource>();
    }

    private void Update()
    {
        // Distance moved = time * speed.
        float distCovered = (Time.time - startTime) * movementSpeed;

        // Fraction of journey completed = current distance divided by total distance.
        float fracJourney = distCovered / journeyLength;

        // Set our position as a fraction of the distance between the markers.
        transform.position = Vector3.Lerp(startingPos.position, endingPos.position, fracJourney);

        if (transform.position == endingPos.position)
        {
            Destroy(lastProjectileAnim);

            transform.position = startingPos.position;
            Instantiate(explosionParticles as GameObject, endingPos);
            lastProjectileAnim = Instantiate(animatedProjectile as GameObject, endingPos);
            startTime = Time.time;
            transform.parent.gameObject.GetComponent<Animator>().Play("turret Fire");
            aSource.Play();
        }
    }
}