using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using UnityEngine.UI;
using XRTool.Util;

namespace XRTool.WorldUI
{
    public class XRSlider : Slider
    {
        private SliderPointEvent onSliderDown;
        private SliderPointEvent onSliderUp;
        private RectTransform body;
        private RectTransform rect3D;
        public RectTransform Rect3D
        {
            get
            {
                if (!rect3D)
                {
                    var obj = fillRect.GetComponentInChildren<XRIcon3D>();
                    if (obj)
                    {
                        rect3D = obj.GetComponent<RectTransform>();
                    }
                }
                return rect3D;
            }
            set => rect3D = value;
        }

        public SliderPointEvent OnSliderDown
        {
            get
            {
                if (onSliderDown == null)
                {
                    onSliderDown = new SliderPointEvent();
                }
                return onSliderDown;
            }
        }

        public SliderPointEvent OnSliderUp
        {
            get
            {
                if (onSliderUp == null)
                {
                    onSliderUp = new SliderPointEvent();
                }
                return onSliderUp;
            }
        }
        protected override void Awake()
        {
            base.Awake();
            body = GetComponent<RectTransform>();
            onValueChanged.AddListener((float f)=>{
                UpdateSlider();
            });
        }

        public override void OnPointerDown(PointerEventData eventData)
        {
            base.OnPointerDown(eventData);
            onSliderDown?.Invoke(eventData);
        }

        public override void OnPointerUp(PointerEventData eventData)
        {
            base.OnPointerUp(eventData);
            OnSliderUp?.Invoke(eventData);
        }

        public void UpdateSlider()
        {
            Vector2 tmp = Rect3D.rect.size;
            tmp.x = value * body.rect.size.x;
            Rect3D.sizeDelta = tmp;
        }
    }
    public class SliderPointEvent : UnityEvent<PointerEventData>
    {
    }
}