using System;
using UnityEngine;
using UnityEngine.EventSystems;

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


    public event EventHandler<OnSelectedObjectChangedEventArgs> OnSelectedObjectChanged;

    public static MouseInputManager Instance { get; private set; }

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

    void Update()
    {
        var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        if (!EventSystem.current.IsPointerOverGameObject() && Physics.Raycast(ray, out var mouseRaycastHit, 100f, _selectableLayerMask))
        {
            mouseRaycastHit.transform.TryGetComponent(out BaseInteractableObject baseObject);
            if (baseObject != null)
            {
                OnSelectedObjectChanged?.Invoke(this, new OnSelectedObjectChangedEventArgs() { SelectedObject = baseObject });
                if (Input.GetMouseButtonDown(0))
                {
                    _waypointVisual.SetWaypoint(baseObject._playerArrivePoint.position);
                    Player.Instance.AddTask(new PlayerTasks(Tasks.Interact, baseObject));
                }
            }
            else
            {
                OnSelectedObjectChanged?.Invoke(this, new OnSelectedObjectChangedEventArgs() { SelectedObject = null });
            }
        }
        else
        {
            OnSelectedObjectChanged?.Invoke(this, new OnSelectedObjectChangedEventArgs() { SelectedObject = null });
            if (Input.GetMouseButtonDown(0))
            {
                if (Physics.Raycast(_camera.ScreenPointToRay(Input.mousePosition), out RaycastHit hit, 100f, _walkableLayerMask))
                {
                    _waypointVisual.SetWaypoint(hit.point);
                    Player.Instance.AddTask(new PlayerTasks(Tasks.Move, _waypointVisual));
                }
            }
        }
    }
}