#nullable enable
using UnityEngine;
using UnityEngine.UIElements;

namespace UVC.UIToolkit
{
    /// <summary>
    /// 실수 속성 아이템
    /// FloatField 또는 Slider 사용
    /// </summary>
    public class UTKFloatPropertyItem : UTKPropertyItemBase<float>
    {
        #region Fields
        private FloatField? _floatField;
        private Slider? _slider;
        private bool _useSlider;
        private float _minValue;
        private float _maxValue = 1f;
        #endregion

        #region Properties
        public override UTKPropertyType PropertyType => UTKPropertyType.Float;

        /// <summary>슬라이더 사용 여부</summary>
        public bool UseSlider
        {
            get => _useSlider;
            set => _useSlider = value;
        }

        /// <summary>최소값 (슬라이더 모드)</summary>
        public float MinValue
        {
            get => _minValue;
            set
            {
                _minValue = value;
                if (_slider != null)
                {
                    _slider.lowValue = value;
                }
            }
        }

        /// <summary>최대값 (슬라이더 모드)</summary>
        public float MaxValue
        {
            get => _maxValue;
            set
            {
                _maxValue = value;
                if (_slider != null)
                {
                    _slider.highValue = value;
                }
            }
        }
        #endregion

        #region Constructor
        public UTKFloatPropertyItem(string id, string name, float initialValue = 0f)
            : base(id, name, initialValue)
        {
        }

        public UTKFloatPropertyItem(string id, string name, float initialValue, float minValue, float maxValue, bool useSlider = true)
            : base(id, name, initialValue)
        {
            _minValue = minValue;
            _maxValue = maxValue;
            _useSlider = useSlider;
        }
        #endregion

        #region Override Methods
        public override VisualElement CreateUI()
        {
            var container = CreateContainer();

            if (_useSlider)
            {
                container.AddToClassList("utk-property-item--slider");
            }

            var label = CreateNameLabel();
            container.Add(label);

            var valueContainer = new VisualElement();
            valueContainer.AddToClassList("utk-property-item__value");

            if (_useSlider)
            {
                _slider = new Slider(_minValue, _maxValue);
                _slider.name = "slider-field";
                _slider.value = Value;
                _slider.AddToClassList("utk-property-item__slider");
                valueContainer.Add(_slider);

                _floatField = new FloatField();
                _floatField.name = "value-field";
                _floatField.value = Value;
                _floatField.AddToClassList("utk-property-item__number-field");
                valueContainer.Add(_floatField);
            }
            else
            {
                _floatField = new FloatField();
                _floatField.name = "value-field";
                _floatField.value = Value;
                valueContainer.Add(_floatField);
            }

            container.Add(valueContainer);

            return container;
        }

        public override void BindUI(VisualElement element)
        {
            base.BindUI(element);

            _floatField = element.Q<FloatField>("value-field");
            _slider = element.Q<Slider>("slider-field");

            if (_floatField != null)
            {
                _floatField.value = Value;
                _floatField.SetEnabled(!IsReadOnly);
                _floatField.RegisterValueChangedCallback(OnFloatFieldChanged);
            }

            if (_slider != null)
            {
                _slider.lowValue = _minValue;
                _slider.highValue = _maxValue;
                _slider.value = Value;
                _slider.SetEnabled(!IsReadOnly);
                _slider.RegisterValueChangedCallback(OnSliderChanged);
            }
        }

        public override void UnbindUI(VisualElement element)
        {
            if (_floatField != null)
            {
                _floatField.UnregisterValueChangedCallback(OnFloatFieldChanged);
                _floatField = null;
            }

            if (_slider != null)
            {
                _slider.UnregisterValueChangedCallback(OnSliderChanged);
                _slider = null;
            }

            base.UnbindUI(element);
        }

        public override void RefreshUI()
        {
            if (_floatField != null && !Mathf.Approximately(_floatField.value, Value))
            {
                _floatField.SetValueWithoutNotify(Value);
            }

            if (_slider != null && !Mathf.Approximately(_slider.value, Value))
            {
                _slider.SetValueWithoutNotify(Value);
            }
        }

        protected override void UpdateReadOnlyState()
        {
            base.UpdateReadOnlyState();

            _floatField?.SetEnabled(!IsReadOnly);
            _slider?.SetEnabled(!IsReadOnly);
        }
        #endregion

        #region Private Methods
        private void OnFloatFieldChanged(ChangeEvent<float> evt)
        {
            float clampedValue = _useSlider ? Mathf.Clamp(evt.newValue, _minValue, _maxValue) : evt.newValue;

            if (_slider != null && !Mathf.Approximately(_slider.value, clampedValue))
            {
                _slider.SetValueWithoutNotify(clampedValue);
            }

            DebounceValueChange(clampedValue, 100).Forget();
        }

        private void OnSliderChanged(ChangeEvent<float> evt)
        {
            if (_floatField != null && !Mathf.Approximately(_floatField.value, evt.newValue))
            {
                _floatField.SetValueWithoutNotify(evt.newValue);
            }

            // 슬라이더는 빠른 반응이 필요하므로 짧은 디바운스
            DebounceValueChange(evt.newValue, 50).Forget();
        }
        #endregion
    }
}