using System.Collections;
using UnityEngine;
using UnityEngine.Serialization;

public class KitchenGun : MonoBehaviour
{
    // The shot projectiles
    public GameObject projectilePrefab;
    // Time between shots, game needs to be restarted to take effect
    public float shotIntervalSeconds = 1f;
    // Time alive for the projectiles
    public float shotAliveSeconds = 1f;
    // Time until collider gets enabled
    public float colliderDisabledSeconds = .2f;
    // Speed of projectiles
    public Vector2 shotSpeed = new Vector2(1f, 0f);
    // Smallest step size for shot speed
    private short shotSpeedStepSize = 50;

    // Start is called before the first frame update
    void Start()
    {
        InvokeRepeating("RecurringBang",0f,shotIntervalSeconds);
    }

    // Update is called once per frame
    void Update()
    {
        
    }

    void RecurringBang()
    {
        StartCoroutine("Bang");
    }

    private IEnumerator Bang()
    {
        Transform t = transform;
        Vector3 position = t.position;
        
        // create projectile
        GameObject projectile = Instantiate(projectilePrefab, 
                                            position, 
                                            t.rotation);

        // determine correct force vector
        Vector2 force = shotSpeed;
        if (t.localScale.x < 0) {
            force *= -1;
        }
        force *= shotSpeedStepSize;
        
        // add force to projectile
        projectile.GetComponent<Rigidbody2D>().AddRelativeForce(force);

        // wait until enabling collider
        yield return new WaitForSeconds(colliderDisabledSeconds);
        projectile.GetComponent<Collider2D>().enabled = true;

        // wait given time before destroying
        yield return new WaitForSeconds(shotAliveSeconds);
        
        Destroy(projectile);
    }
}