#nullable enable
using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine.UIElements;

namespace UVC.UIToolkit
{
    /// <summary>
    /// 라디오 그룹 속성 아이템
    /// RadioButton 그룹으로 단일 선택
    /// </summary>
    public class UTKRadioPropertyItem : UTKPropertyItemBase<int>
    {
        #region Fields
        private RadioButtonGroup? _radioGroup;
        private List<string> _choices;
        #endregion

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

        /// <summary>선택 가능한 항목 목록</summary>
        public List<string> Choices
        {
            get => _choices;
            set
            {
                _choices = value ?? new List<string>();
                if (_radioGroup != null)
                {
                    _radioGroup.choices = _choices;
                }
            }
        }

        /// <summary>현재 선택된 항목의 텍스트</summary>
        public string? SelectedText
        {
            get
            {
                if (Value >= 0 && Value < _choices.Count)
                {
                    return _choices[Value];
                }
                return null;
            }
        }
        #endregion

        #region Constructor
        public UTKRadioPropertyItem(string id, string name, List<string> choices, int selectedIndex = 0)
            : base(id, name, Math.Max(0, Math.Min(selectedIndex, (choices?.Count ?? 1) - 1)))
        {
            _choices = choices ?? new List<string>();
        }

        public UTKRadioPropertyItem(string id, string name, IEnumerable<string> choices, int selectedIndex = 0)
            : this(id, name, choices?.ToList() ?? new List<string>(), selectedIndex)
        {
        }
        #endregion

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

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

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

            _radioGroup = new RadioButtonGroup();
            _radioGroup.name = "radio-group";
            _radioGroup.choices = _choices;
            _radioGroup.value = Value;
            valueContainer.Add(_radioGroup);

            container.Add(valueContainer);

            return container;
        }

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

            _radioGroup = element.Q<RadioButtonGroup>("radio-group");

            if (_radioGroup != null)
            {
                _radioGroup.choices = _choices;
                _radioGroup.value = Value;
                _radioGroup.SetEnabled(!IsReadOnly);
                _radioGroup.RegisterValueChangedCallback(OnRadioChanged);
            }
        }

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

            base.UnbindUI(element);
        }

        public override void RefreshUI()
        {
            if (_radioGroup != null && _radioGroup.value != Value)
            {
                _radioGroup.SetValueWithoutNotify(Value);
            }
        }

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

            if (_radioGroup != null)
            {
                _radioGroup.SetEnabled(!IsReadOnly);
            }
        }
        #endregion

        #region Public Methods
        /// <summary>텍스트로 선택</summary>
        public void SelectByText(string text)
        {
            int index = _choices.IndexOf(text);
            if (index >= 0)
            {
                Value = index;
            }
        }
        #endregion

        #region Private Methods
        private void OnRadioChanged(ChangeEvent<int> evt)
        {
            Value = evt.newValue;
        }
        #endregion
    }
}