Rimor_Grapple

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

public class Grapple : MonoBehaviour
{
    public GrapplingHook grapplingHook;
    [HideInInspector] public Rigidbody2D rb;
    [HideInInspector] public Collider2D collider;

    public GameObject attachedTo;

    private void Awake()
    {
        rb = GetComponent<Rigidbody2D>();
        collider = GetComponent<Collider2D>();
    }

    private void Update()
    {
        if (attachedTo && !attachedTo.activeSelf) grapplingHook.UnGrapple();
    }

    private void OnCollisionEnter2D(Collision2D collision)
    {
        if (grapplingHook.isGrappled) return;

        // Is the collision grappleable
        if (grapplingHook.whatIsGrappleAble == (grapplingHook.whatIsGrappleAble | (1 << collision.gameObject.layer)))
        {
            // Did we hit a physics object?
            Rigidbody2D collidingBody = collision.gameObject.GetComponent<Rigidbody2D>();
            if (collidingBody != null)
            {
                transform.SetParent(collidingBody.transform);
                rb.velocity = Vector2.zero;
                rb.isKinematic = true;
                collider.isTrigger = true;
                grapplingHook.joint.connectedBody = collidingBody;
                grapplingHook.Grappled();
                grapplingHook.joint.connectedAnchor = transform.localPosition;
            }
            else
            {
                rb.velocity = Vector2.zero;
                rb.isKinematic = true;
                collider.isTrigger = true;
                grapplingHook.joint.connectedBody = rb;
                grapplingHook.Grappled();
                grapplingHook.joint.connectedAnchor = Vector2.zero;
            }

            attachedTo = collision.gameObject;
        }
        else
        {
            // Hit non-grappleable layer, ungrapple
            grapplingHook.UnGrapple();
        }
    }
}