/*
*Author: Lin Hengrui Ryan
*Date:19/06/2024
*Description: for the bullet prefab to allow the bullet to deal damage to the player and enemies and to kill the bullet prefab after a certain duration or when it collides with a collider
*/

using System.Collections;
using System.Collections.Generic;
using Unity.VisualScripting;
using UnityEngine;

public class BulletCollider : MonoBehaviour
{
    /// <summary>
    /// the damage that the bullet will deal to the object that it collides with
    /// </summary>
    public int damage;

    /// <summary>
    /// how long the bullet will live for after it gets shot if it does not collide with a collider
    /// </summary>
    public float lifespan;

    /// <summary>
    /// when the bullet colides with annother object
    /// </summary>
    /// <param name="other">the collider of the other objectt</param>
    void OnCollisionEnter(Collision other)
    {
        ///<summary>
        ///checking if the other object is the player or enemy and then damage the appropriate object
        ///</summary>
        if (other.transform.tag == "Player")
        {   
            
            GameManager.instance.damagePlayer(damage);
        }
        else if (other.transform.tag == "enemy")
        {
            other.transform.GetComponent<EnemyAi>().health -= damage;
            if (other.transform.GetComponent<EnemyAi>().health <= 0)
            {
                Destroy(other.gameObject);
            }
        }
        killBullet();
    }
    /// <summary>
    /// to calculate the time passed and kill the bullt afer a certain time
    /// </summary>
    void Update()
    {
        lifespan -= Time.deltaTime;
        if (lifespan <= 0)
        {
            killBullet();
        }
    }
    /// <summary>
    /// to destroy the bullet
    /// </summary>
    public void killBullet()
    {
        Destroy(gameObject);
    }
}