TheMuseumProject/Assets/Scripts/Player/Interactions/GrappleHook.cs

using UnityEngine;
using Player.Information;
namespace Player.Interactions
{
    public class GrappleHook : MonoBehaviour
    {
        [SerializeField] private float maxGrappleThrow;

        [SerializeField] private float grappleStrength;

        [SerializeField] public float grappledAirControl;

        [SerializeField] private GameObject grapplePointPrefab;

        public bool grappled;

        [SerializeField] private LineRenderer lineRender;
        public GameObject reticleMaster;
        private GameObject curPointObj;
        private Vector3 grapplePos;

        private PlayerStats playerStats;
        private GameObject reticleClose;

        private GameObject reticleOpen;

        // Start is called before the first frame update
        private void Start()
        {
            grappled = false;
            grapplePos = Vector3.zero;
            lineRender.enabled = false;

            reticleOpen = reticleMaster.transform.Find("Reticle Open").gameObject;
            reticleClose = reticleMaster.transform.Find("Reticle Close").gameObject;
            reticleClose.SetActive(false);

            playerStats = gameObject.GetComponent<PlayerStats>();
        }

        // Update is called once per frame
        private void Update()
        {
            if (playerStats.grappleEnabled)
            {
                if (WouldGrapple())
                {
                    reticleOpen.SetActive(false);
                    reticleClose.SetActive(true);
                }
                else
                {
                    reticleOpen.SetActive(true);
                    reticleClose.SetActive(false);
                }

                if ((Input.GetKeyDown(KeyCode.L) || Input.GetMouseButtonDown(0)) ) ShootGrapple();

                if ((Input.GetKeyDown(KeyCode.K) || Input.GetMouseButtonUp(0)) ) ReleaseGrapple();

                if (grappled)
                {
                    lineRender.SetPosition(0, gameObject.transform.position);
                    lineRender.SetPosition(1, grapplePos);
                }
            }
        }

        public bool WouldGrapple()
        {
            RaycastHit hit;
            if (Physics.Raycast(Camera.main.transform.position, Camera.main.transform.forward, out hit,
                    maxGrappleThrow))
            {
                TraversalProperties tp = hit.collider.gameObject.GetComponent<TraversalProperties>();
                if (tp == null || tp.canGrappleOnto) return true;
            }

            return false;
        }

        public void ShootGrapple()
        {
            // perform a raycast from the player's reticle
            RaycastHit hit;
            if (Physics.Raycast(Camera.main.transform.position, Camera.main.transform.forward, out hit,
                    maxGrappleThrow))
            {
                //Debug.DrawRay(Camera.main.transform.position, hit.point, Color.green, 5f);
                TraversalProperties tp = hit.collider.gameObject.GetComponent<TraversalProperties>();
                if (tp == null || tp.canGrappleOnto)
                {
                    grappled = true;
                    grapplePos = hit.point;
                    if (curPointObj != null) Destroy(curPointObj);

                    curPointObj = Instantiate(grapplePointPrefab, hit.point, Quaternion.identity);
                    lineRender.enabled = true;
                }
            }
        }

        public void ReleaseGrapple()
        {
            grappled = false;
            grapplePos = Vector3.zero;
            if (curPointObj != null) Destroy(curPointObj);

            lineRender.enabled = false;
        }

        public Vector3 PullForce(Vector3 playerPos)
        {
            if (!grappled)
                return Vector3.zero;
            return (grapplePos - playerPos).normalized * grappleStrength;
        }
    }
}