using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

namespace BNG {
    public class PointerEvents : MonoBehaviour, IPointerClickHandler, IPointerEnterHandler, IPointerExitHandler, IPointerDownHandler, IPointerUpHandler {

        [Header("Maximium Distance")]
        [Tooltip("Maximum Distance this object can be from the UIPointer to be considered valid and receive events")]
        public float MaxDistance = 100f;

        [Header("Enable Events")]
        [Tooltip("If True then the Unity Events below will be sent. Set to False if you need to disable sending pointer events.")]
        public bool Enabled = true;

        [Header("Unity Events : ")]
        public PointerEventDataEvent OnPointerClickEvent;
        public PointerEventDataEvent OnPointerEnterEvent;
        public PointerEventDataEvent OnPointerExitEvent;
        public PointerEventDataEvent OnPointerDownEvent;
        public PointerEventDataEvent OnPointerUpEvent;

        public virtual void OnPointerClick(PointerEventData eventData) {
            // Don't call events if exceeded distance
            if(DistanceExceeded(eventData)) {
                return;
            }

            OnPointerClickEvent?.Invoke(eventData);
        }

        public virtual void OnPointerEnter(PointerEventData eventData) {
            // Don't call events if exceeded distance
            if (DistanceExceeded(eventData)) {
                return;
            }

            OnPointerEnterEvent?.Invoke(eventData);
        }

        public virtual void OnPointerExit(PointerEventData eventData) {
            // Can call OnPointerExit events even if exceeded distance
            OnPointerExitEvent?.Invoke(eventData);
        }


        public virtual void OnPointerDown(PointerEventData eventData) {
            // Don't call events if exceeded distance
            if (DistanceExceeded(eventData)) {
                return;
            }

            OnPointerDownEvent?.Invoke(eventData);
        }

        public virtual void OnPointerUp(PointerEventData eventData) {
            // Can call OnPointerUp events even if exceeded distance
            OnPointerUpEvent?.Invoke(eventData);
        }

        public virtual bool DistanceExceeded(PointerEventData eventData) {

            if(eventData == null) {
                return false;
            }

            if(eventData.pointerCurrentRaycast.distance > MaxDistance) {
                return true;
            }

            return false;
        }
    }
}