#nullable enable
using UnityEngine.UIElements;

namespace UVC.UIToolkit
{
    /// <summary>
    /// 문자열 속성 아이템
    /// TextField를 사용한 텍스트 입력
    /// </summary>
    public class UTKStringPropertyItem : UTKPropertyItemBase<string>
    {
        #region Fields
        private UTKInputField? _inputField;
        private bool _isMultiline;
        private int _maxLength;
        #endregion

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

        /// <summary>멀티라인 모드 여부</summary>
        public bool IsMultiline
        {
            get => _isMultiline;
            set
            {
                _isMultiline = value;
                if (_inputField != null)
                {
                    _inputField.multiline = value;
                }
            }
        }

        /// <summary>최대 문자 길이 (0 = 무제한)</summary>
        public int MaxLength
        {
            get => _maxLength;
            set
            {
                _maxLength = value;
                if (_inputField != null)
                {
                    _inputField.maxLength = value;
                }
            }
        }
        #endregion

        #region Constructor
        public UTKStringPropertyItem(string id, string name, string initialValue = "")
            : base(id, name, initialValue ?? string.Empty)
        {
        }
        #endregion

        #region Override Methods
        public override VisualElement CreateUI()
        {
            var container = CreateUIFromUxml("UTKStringPropertyItem");
            if (container == null)
            {
                return CreateUIFallback();
            }

            _inputField = container.Q<UTKInputField>("value-field");
            if (_inputField != null)
            {
                _inputField.Value = Value;
                _inputField.multiline = _isMultiline;
                if (_maxLength > 0)
                {
                    _inputField.maxLength = _maxLength;
                }
            }

            return container;
        }

        private VisualElement CreateUIFallback()
        {
            var container = CreateContainer();

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

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

            _inputField = new UTKInputField();
            _inputField.name = "value-field";
            _inputField.Value = Value;
            _inputField.multiline = _isMultiline;
            if (_maxLength > 0)
            {
                _inputField.maxLength = _maxLength;
            }

            valueContainer.Add(_inputField);
            container.Add(valueContainer);

            return container;
        }

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

            _inputField = element.Q<UTKInputField>("value-field");
            if (_inputField != null)
            {
                _inputField.Value = Value;
                _inputField.SetEnabled(!IsReadOnly);
                _inputField.OnValueChanged += OnTextChanged;
            }
        }

        public override void UnbindUI(VisualElement element)
        {
            if (_inputField != null)
            {
                _inputField.OnValueChanged -= OnTextChanged;
                _inputField = null;
            }

            base.UnbindUI(element);
        }

        public override void RefreshUI()
        {
            if (_inputField != null && _inputField.Value != Value)
            {
                _inputField.SetValue(Value, false);
            }
        }

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

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

        #region Private Methods
        private void OnTextChanged(string newValue)
        {
            DebounceValueChange(newValue).Forget();
        }
        #endregion
    }
}