ChainHandle.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.UI;

public class ChainHandle : MonoBehaviour
{
    [SerializeField]
    Transform player;
    [SerializeField]
    Transform firstChain;
    float distance;
    bool grabbed;
    BoxCollider col;
    Rigidbody rb;

    [SerializeField]
    Text textPrompt;

    bool inRange;
    // Start is called before the first frame update
    void Start()
    {
        distance = Vector3.Distance(transform.position, firstChain.position);
        PlayerClamped.distance = distance;
        col = GetComponent<BoxCollider>();
        rb = GetComponent<Rigidbody>();
        rb.isKinematic = false;
        rb.useGravity = true;
    }
    void OnDrawGizmos()
    {
        Gizmos.color = Color.yellow;
        if (firstChain != null)
        {
            Gizmos.DrawWireSphere(firstChain.position, distance) ;
        }
    }

    private void Update()
    {
        if (Input.GetKeyDown(KeyCode.E))
        {
            Grab();
        }
    }

    private void FixedUpdate()
    {
        if (grabbed)
        {
            // towards "player"
            Vector3 dir = player.transform.position - firstChain.transform.position;
            // clamp length
            dir = Vector3.ClampMagnitude(dir, distance);
            // add clamped length
            transform.position = firstChain.transform.position + dir;
            // look towards movement
            transform.rotation = Quaternion.LookRotation(-dir);
        }

    }

    void Grab()
    {
        grabbed = !grabbed;
        col.enabled = !grabbed;
        rb.isKinematic = grabbed;
        rb.useGravity = !grabbed;
        textPrompt.text = "Press E to drop";
    }

    private void OnTriggerEnter(Collider other)
    {
        if(other.gameObject == player.gameObject)
        {
            inRange = true;
            other.GetComponent<PlayerClamped>().inRange = true;
            textPrompt.text = "Press E to grab";
        }
    }

    private void OnTriggerExit(Collider other)
    {
        if (other.gameObject == player.gameObject)
        {
            inRange = true;
            other.GetComponent<PlayerClamped>().inRange = false;
            textPrompt.text = "";


        }
    }
}