#nullable enable
using System;
using UnityEngine;
using UnityEngine.UIElements;

namespace UVC.UIToolkit
{
    /// <summary>
    /// 도움말 박스 컴포넌트.
    /// Unity HelpBox를 래핑하여 커스텀 스타일을 적용합니다.
    /// </summary>
    [UxmlElement]
    public partial class UTKHelpBox : HelpBox, IDisposable
    {
        #region Constants
        private const string USS_PATH = "UIToolkit/Common/UTKHelpBox";
        #endregion

        #region Fields
        private bool _disposed;
        #endregion

        #region Properties
        /// <summary>메시지 텍스트</summary>
        public string Message
        {
            get => text;
            set => text = value;
        }

        /// <summary>메시지 타입</summary>
        public new HelpBoxMessageType messageType
        {
            get => base.messageType;
            set
            {
                base.messageType = value;
                UpdateMessageTypeClass();
            }
        }
        #endregion

        #region Constructor
        public UTKHelpBox() : base()
        {
            UTKThemeManager.Instance.ApplyThemeToElement(this);

            var uss = Resources.Load<StyleSheet>(USS_PATH);
            if (uss != null)
            {
                styleSheets.Add(uss);
            }

            SetupStyles();
            SubscribeToThemeChanges();
        }

        public UTKHelpBox(string message, HelpBoxMessageType type = HelpBoxMessageType.Info) : this()
        {
            text = message;
            messageType = type;
        }
        #endregion

        #region Setup
        private void SetupStyles()
        {
            AddToClassList("utk-helpbox");
            UpdateMessageTypeClass();
        }

        private void UpdateMessageTypeClass()
        {
            RemoveFromClassList("utk-helpbox--info");
            RemoveFromClassList("utk-helpbox--warning");
            RemoveFromClassList("utk-helpbox--error");
            RemoveFromClassList("utk-helpbox--none");

            var typeClass = messageType switch
            {
                HelpBoxMessageType.Warning => "utk-helpbox--warning",
                HelpBoxMessageType.Error => "utk-helpbox--error",
                HelpBoxMessageType.None => "utk-helpbox--none",
                _ => "utk-helpbox--info"
            };
            AddToClassList(typeClass);
        }

        private void SubscribeToThemeChanges()
        {
            UTKThemeManager.Instance.OnThemeChanged += OnThemeChanged;
            RegisterCallback<DetachFromPanelEvent>(_ =>
            {
                UTKThemeManager.Instance.OnThemeChanged -= OnThemeChanged;
            });
        }

        private void OnThemeChanged(UTKTheme theme)
        {
            UTKThemeManager.Instance.ApplyThemeToElement(this);
        }
        #endregion

        #region IDisposable
        public void Dispose()
        {
            if (_disposed) return;
            _disposed = true;

            UTKThemeManager.Instance.OnThemeChanged -= OnThemeChanged;
        }
        #endregion
    }
}