using System;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.InputSystem;

public class InGameMouseHandler:UnityEngine.Object
{
    private LayerMask _selectableLayerMask;
    
    private LayerMask _walkableLayerMask;
    
    private WaypointVisual _waypointVisual;

    private Ray _ray;
    private Camera _camera;
    public static event EventHandler<OnSelectedObjectChangedEventArgs> OnSelectedObjectChanged;

    private BaseInteractableObject _selectedObject;


    public InGameMouseHandler(Camera camera)
    {
        _camera = camera;
        _selectableLayerMask =LayerMask.NameToLayer("Selectable");
        _walkableLayerMask = LayerMask.NameToLayer("Walking");

        var  waypointPrefab = Resources.Load("WayPointSign", typeof(WaypointVisual)) as WaypointVisual;
        _waypointVisual =Instantiate(waypointPrefab);

        GameManager.Instance.Input.PlayerAction.PointClick.performed += ClickToMove;
    }

    public void Dispose()
    {
        GameManager.Instance.Input.PlayerAction.PointClick.performed += ClickToMove;
    }

    private void ClickToMove(InputAction.CallbackContext context)
    {
        if (!EventSystem.current.IsPointerOverGameObject())
        {
            if (_selectedObject != null)
            {
                _waypointVisual.SetWaypoint(_selectedObject._interactionPoint.position);
                Player.Instance.AddTask(new PlayerTasks(Tasks.Interact, _selectedObject));
            }
            else
            {
                if (Physics.Raycast(_ray, out RaycastHit hit, 100f, _walkableLayerMask))
                {
                    _waypointVisual.SetWaypoint(hit.point);
                    Player.Instance.AddTask(new PlayerTasks(Tasks.Move, _waypointVisual));
                }
            }
        }
    }

    public void Update()
    {
        _ray = _camera.ScreenPointToRay(Mouse.current.position.ReadValue());
        if(EventSystem.current.IsPointerOverGameObject())
        {
            return;
        }
        //hide rounded menu
        if (Physics.Raycast(_ray, out var mouseRaycastHit, 100f, _selectableLayerMask))
        {
            mouseRaycastHit.transform.TryGetComponent(out _selectedObject);
            if (_selectedObject != null)
            {
                OnSelectedObjectChanged?.Invoke(this, new OnSelectedObjectChangedEventArgs() { SelectedObject = _selectedObject });
            }
            else
            {
                OnSelectedObjectChanged?.Invoke(this, new OnSelectedObjectChangedEventArgs() { SelectedObject = null });
            }
        }
        else
        {
            OnSelectedObjectChanged?.Invoke(this, new OnSelectedObjectChangedEventArgs() { SelectedObject = null });
        }
    }
}