StellarXipher/Assets/Puzzles/Untangle/Scripts/Point.cs

using UnityEngine;
using UnityEngine.Rendering.Universal;
using System.Linq;  // for FirstOrDefault()

public class Point : MonoBehaviour
{
    public int id;
    public UntangleGameManager manager;

    // optional: assign in inspector or else we'll try to find it
    [SerializeField] private Camera uiOverlayCamera;

    private Vector3 offset;

    void Awake()
    {
        if (uiOverlayCamera == null && Camera.main != null)
        {
            var extra = Camera.main.GetComponent<UniversalAdditionalCameraData>();
            if (extra != null)
            {
                // look for the camera named "UIOverlayCamera"
                uiOverlayCamera = extra.cameraStack
                    .FirstOrDefault(cam => cam.name == "UIOverlayCamera");
            }
        }
    }

    void OnMouseDown()
    {
        // pick UI overlay if we have it, otherwise fallback
        var cam = uiOverlayCamera != null ? uiOverlayCamera : Camera.main;
        Vector3 worldPoint = cam.ScreenToWorldPoint(Input.mousePosition);
        worldPoint.z = 0;
        offset = transform.position - worldPoint;
        Debug.Log($"Point {id} clicked. Offset (from {cam.name}): {offset}");
    }

    void OnMouseDrag()
    {
        var cam = uiOverlayCamera != null ? uiOverlayCamera : Camera.main;
        Vector3 raw = cam.ScreenToWorldPoint(Input.mousePosition);
        raw.z = transform.position.z;
        transform.position = raw + offset;
        manager.CheckIfSolved();
        foreach (var c in manager.connections)
            c.UpdateLine();
    }
}