using UnityEngine;

namespace MS_Outline.Demo
{
    /// <summary>
    /// Enables glow on any object with GlowOutlineTarget when the mouse hovers over it.
    /// Attach this to any active GameObject in the scene (e.g., Main Camera).
    /// </summary>
    public class MouseHoverGlow : MonoBehaviour
    {
        [Tooltip("The camera to use for raycasting. If not set, Camera.main will be used.")]
        [SerializeField] private Camera raycastCamera;

        [Tooltip("Maximum distance for the raycast.")]
        [SerializeField] private float maxRaycastDistance = 100f;

        [Tooltip("Layer mask for the raycast. Leave as Everything to hit all layers.")]
        [SerializeField] private LayerMask layerMask = ~0;

        private GlowOutlineTarget currentHoveredTarget;

        private void Start()
        {
            if (raycastCamera == null)
                raycastCamera = Camera.main;
        }

        private void Update()
        {
            if (raycastCamera == null)
                return;

            Ray ray = raycastCamera.ScreenPointToRay(Input.mousePosition);

            if (Physics.Raycast(ray, out RaycastHit hit, maxRaycastDistance, layerMask))
            {
                var target = hit.collider.GetComponentInParent<GlowOutlineTarget>();

                if (target != currentHoveredTarget)
                {
                    // Disable glow on previous target
                    if (currentHoveredTarget != null)
                        currentHoveredTarget.DisableGlow();

                    // Enable glow on new target
                    currentHoveredTarget = target;
                    if (currentHoveredTarget != null)
                        currentHoveredTarget.EnableGlow();
                }
            }
            else
            {
                // Mouse is not over any collider
                if (currentHoveredTarget != null)
                {
                    currentHoveredTarget.DisableGlow();
                    currentHoveredTarget = null;
                }
            }
        }

        private void OnDisable()
        {
            // Clean up when disabled
            if (currentHoveredTarget != null)
            {
                currentHoveredTarget.DisableGlow();
                currentHoveredTarget = null;
            }
        }
    }
}