using System;
using UnityEngine;
using UnityEngine.EventSystems;

public class MouseInputManager : MonoBehaviour
{
    [SerializeField]
    private LayerMask _selectableLayerMask;
    [SerializeField]
    private LayerMask _walkableLayerMask;
    [SerializeField]
    private Camera _camera;

    private RaycastHit _raycastHit;
    
    public event EventHandler<OnSelectedObjectChangedEventArgs> OnSelectedObjectChanged;
    public event EventHandler<OnMovementTargetSelectedEventArgs> OnMovementTargetSelected;

    public static MouseInputManager Instance { get; private set; }

    private void Awake()
    {
        if (Instance != null)
        {
            Debug.Log("There's more than one player instance");
        }
        Instance = this;
    }

    void Update()
    {
        var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        if (!EventSystem.current.IsPointerOverGameObject() && Physics.Raycast(ray, out _raycastHit, 100f, _selectableLayerMask))
        {
            OnSelectedObjectChanged?.Invoke(this, new OnSelectedObjectChangedEventArgs() { SelectedObject = _raycastHit.transform });
        }
        else
        {
            OnSelectedObjectChanged?.Invoke(this, new OnSelectedObjectChangedEventArgs() { SelectedObject = null });
        }
        if (Input.GetMouseButton(0))
        {
            if (Physics.Raycast(_camera.ScreenPointToRay(Input.mousePosition), out RaycastHit hit, 100f, _walkableLayerMask))
            {
                var pointToMove = hit.point;
                OnMovementTargetSelected?.Invoke(this, new OnMovementTargetSelectedEventArgs() { PointToMove = pointToMove });
            }
        }
    }
}