using _PROJECT.NewHandPresence;
using System.Collections.Generic;
using UnityEngine;

public enum GrabbingHand
{
    Right,
    Left
}

public class DoorHandReplacer : MonoBehaviour
{
    public GameObject LeftHand;
    public GameObject RightHand;

    private GrabbingHand? hand = null;          // nullable
    private SmartHandPresence currentHand = null;
    private bool isGrabbing;

    // Tracks all hands currently inside the trigger
    private HashSet<SmartHandPresence> handsInTrigger = new HashSet<SmartHandPresence>();

    public void ManifestDoorHand()
    {
        if (currentHand == null || hand == null) return;
        isGrabbing = true;
        switch (hand.Value)
        {
            case GrabbingHand.Left:
                RightHand.SetActive(false);
                LeftHand.SetActive(true);
                Debug.Log("Dissapearing hand");
                break;

            case GrabbingHand.Right:
                LeftHand.SetActive(false);
                RightHand.SetActive(true);
                Debug.Log("Dissapearing hand");
                break;
        }
    }

    public void DeManifestDoorHand()
    {
        isGrabbing = false;
        LeftHand.SetActive(false);
        RightHand.SetActive(false);
        if (currentHand == null) return;
    }

    private void OnTriggerEnter(Collider other)
    {
        if (isGrabbing) return;

        // IMPORTANT: in case hands have multiple colliders
        SmartHandPresence playerHand = other.GetComponentInParent<SmartHandPresence>();
        if (playerHand == null) return;

        handsInTrigger.Add(playerHand);

        currentHand = playerHand;

        string name = playerHand.gameObject.name;

        if (name.Contains("left", System.StringComparison.OrdinalIgnoreCase))
        {
            hand = GrabbingHand.Left;
        }
        else if (name.Contains("right", System.StringComparison.OrdinalIgnoreCase))
        {
            hand = GrabbingHand.Right;
        }
    }

    private void OnTriggerExit(Collider other)
    {
        if (isGrabbing) return;

        SmartHandPresence playerHand = other.GetComponentInParent<SmartHandPresence>();
        if (playerHand == null) return;

        handsInTrigger.Remove(playerHand);

        // If no hands remain, clear everything
        if (handsInTrigger.Count == 0)
        {
            currentHand = null;
            hand = null;
        }
        else
        {
            // Pick any remaining hand as current
            foreach (var remainingHand in handsInTrigger)
            {
                currentHand = remainingHand;

                string name = remainingHand.gameObject.name;
                hand = name.Contains("left", System.StringComparison.OrdinalIgnoreCase)
                    ? GrabbingHand.Left
                    : GrabbingHand.Right;

                break;
            }
        }
    }

}