using System;
using UnityEngine;
using UnityEngine.UI;

public class PlayerWeapon : MonoBehaviour
{
    // Copied and modified from https://answers.unity.com/questions/696001/how-to-make-bullet-shoot-in-same-direction-as-play.html

    public Camera sceneCamera;
    public Rigidbody2D bullet;
    public float attackSpeed = 0.5f;
    public float bulletSpeed = 600;

    private Rigidbody2D _player;
    private float _cooldown;
    
    private void Start()
    {
        _player = GetComponent<Rigidbody2D>();
        
    }

    private void Update()
    {
        Vector2 mousePosition = sceneCamera.ScreenToWorldPoint(Input.mousePosition);
        Vector2 playerPosition = _player.position;
        
        if (!(Time.time >= _cooldown) || !Input.GetMouseButton(0)) return;
        Fire(playerPosition, mousePosition);
    }

    private void Fire(Vector2 from, Vector2 towards)
    {
        Rigidbody2D firingBullet = Instantiate(bullet, _player.transform);
        // TODO does it matter that GetComponent is expensive?
        Physics2D.IgnoreCollision(firingBullet.GetComponent<Collider2D>(), _player.GetComponent<Collider2D>());
        Vector2 direction = towards - from;
        firingBullet.AddForce(direction.normalized * bulletSpeed + _player.velocity);
        
        _cooldown = Time.time + attackSpeed;
    }
}