using UnityEngine;

public class Bullet : MonoBehaviour
{
    public float speed = 10f;

    private Vector3 direction;
    private bool initialized;

    public BulletStates bulletState;

    public float lifeTime = 10f;

    public GameObject nearMissEffectPrefab;

    public void Init(Vector3 targetPos)
    {
        direction = (targetPos - transform.position).normalized;
        initialized = true;
    }

    void Update()
    {
        // ❌ prevent running before Init
        if (!initialized)
            return;

        // ⏱ lifetime countdown
        lifeTime -= Time.deltaTime;
        if (lifeTime <= 0f)
        {
            Destroy(gameObject);
            return;
        }

        // Move
        transform.position += direction * speed * Time.deltaTime;

        // Rotate to face movement
        Vector2 dir = direction;
        float angle = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg;
        transform.rotation = Quaternion.Euler(0, 0, angle);
    }

    public void Reverse()
    {
        direction = -direction;
    }

    public void OnCollisionEnter2D(Collision2D collision)
    {
        if (!collision.collider.CompareTag("Bullet")) return;

        if (bulletState != BulletStates.reversed) return;

        Destroy(collision.gameObject);
        Destroy(gameObject);
    }

    private void OnDestroy()
    {
           Instantiate(nearMissEffectPrefab, this.gameObject.transform.position, Quaternion.identity);

    }
}



public enum BulletStates
{
    active,
    inNearMissZone,
    inPointZone,
    markForDeletion,
    reversed,
    inactive
}