using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UIElements;

namespace BITKit.UX
{
    public class OnScreenButton : OnScreenControl
    {
        public new class UxmlTraits : VisualElement.UxmlTraits
        {
            private readonly UxmlFloatAttributeDescription m_PressedValueAttribute = new ()
            {
                name = "PressedValue",
                defaultValue = 1f,
            };

            private readonly UxmlBoolAttributeDescription m_ReleasePressAttribute = new()
            {
                name = "ReleasePress"
            };

            public override void Init(VisualElement ve, IUxmlAttributes bag, CreationContext cc)
            {
                base.Init(ve, bag, cc);
                var table = (OnScreenButton)ve;
                table.PressedValue = m_PressedValueAttribute.GetValueFromBag(bag, cc);
                table.ReleasePress = m_ReleasePressAttribute.GetValueFromBag(bag, cc);
            }
        }
        public new class UxmlFactory : UxmlFactory<OnScreenButton, UxmlTraits> { }
        public float PressedValue { get; set; }= 1f;
        public bool ReleasePress { get; set; }

        private bool _isPressed;
        private int _pointerId=-1;
        private Label _label;

        private readonly ValidHandle _isTriggered = new();
        public OnScreenButton()
        {
            RegisterCallback<PointerUpEvent>(OnPointerUp);
            RegisterCallback<PointerDownEvent>(OnPointerDown);
            RegisterCallback<PointerMoveEvent>(OnPointerMove);
            this.AddManipulator(new Clickable(OnClick));
            _label = this.Create<Label>();
            
            _isTriggered.AddListener(x =>
            {
                if (x)
                {
                    AddToClassList("selected");
                }
                else
                {
                    RemoveFromClassList("selected");
                }
                var value = x?PressedValue : 0f;
                SendValueToControl( value);
            });
        }
        private void OnClick()
        {
            
        }
        private void OnPointerMove(PointerMoveEvent evt)
        {
            if(_pointerId!=evt.pointerId)return;
            
            if (ReleasePress)
            {
                _isPressed = true;
                return;
            }

            if (_isPressed is false)
            {
                _isTriggered.AddElement(0);
                _isPressed = true;
              ;
            }
        }

        private void OnPointerDown(PointerDownEvent evt)
        {
            if(_pointerId is not -1)return;
            
            _pointerId = evt.pointerId;

            _isPressed = true;
            
            _isTriggered.AddElement(0);
        }

        private void OnPointerUp(PointerUpEvent evt)
        {
            if(_pointerId!=evt.pointerId)return;
            
            if (ReleasePress && _isPressed)
            {
                _isTriggered.AddElement(0);
                _pointerId = -1;
                
                return;
            }
            
            _pointerId = -1;
            
            
            _isTriggered.RemoveElement(0);
            
        }
        protected override string ControlPathInternal { get; set; }
    }
}