using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Breakable : MonoBehaviour
{
    [SerializeField] private GameObject _debrisRoot;
    [SerializeField] private float _minFallSpeed = 2f;
    [SerializeField] private float _explosionForce = 100f;
    [SerializeField] private float _explosionRadius = 2f;
    [SerializeField] private float _disappearTime = 3f;

    private Rigidbody _rb;
    private bool _broken = false;

    void Start()
    {
        _rb = GetComponent<Rigidbody>();
        _debrisRoot.SetActive(false);
    }

    void OnCollisionEnter(Collision collision)
    {
        if (_broken) return;
        if (_rb.velocity.y < -_minFallSpeed)
            Break(collision.GetContact(0).point);
    }

    void Break(Vector3 contactPoint)
    {
        _broken = true;
        _debrisRoot.SetActive(true);
        _debrisRoot.transform.parent = null;

        Rigidbody[] pieces = _debrisRoot.GetComponentsInChildren<Rigidbody>();
        foreach (var piece in pieces)
        {
            piece.velocity = _rb.velocity;
            piece.AddExplosionForce(_explosionForce, contactPoint, _explosionRadius);
        }

        Destroy(_debrisRoot, _disappearTime); 
        Destroy(gameObject);                
    }
}