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

namespace UVC.UIToolkit
{
    /// <summary>
    /// 설정 표시 정보 탭 뷰.
    /// UTKReordableList를 사용하여 표시 항목의 순서, 사용 유무, 내용을 관리합니다.
    /// </summary>
    [UxmlElement]
    public partial class UTKSettingDisplayInfoTabView : VisualElement, IDisposable
    {
        #region Constants
        private const string USS_PATH = "UIToolkit/Modal/Setting/UTKSettingDisplayInfoTabViewUss";
        #endregion

        #region Fields
        private bool _disposed;
        private UTKReordableList? _reordableList;
        #endregion

        #region Events
        /// <summary>순서 변경 시 발생</summary>
        public event Action? OnOrderChanged;

        /// <summary>데이터(체크/텍스트) 변경 시 발생</summary>
        public event Action? OnDataChanged;
        #endregion

        #region Constructor
        public UTKSettingDisplayInfoTabView() : base()
        {
            // 1. 테마 적용
            UTKThemeManager.Instance.ApplyThemeToElement(this);

            // 2. USS 로드
            var uss = Resources.Load<StyleSheet>(USS_PATH);
            if (uss != null)
            {
                styleSheets.Add(uss);
            }

            // 3. UI 생성
            CreateUI();

            // 4. 테마 변경 구독
            SubscribeToThemeChanges();

            SampleSetAndGetWithDictionary();
        }
        #endregion

        #region Setup
        private void CreateUI()
        {
            AddToClassList("setting-display-tab-view");

            _reordableList = new UTKReordableList();
            _reordableList.style.flexGrow = 1;
            _reordableList.OnOrderChanged += () => OnOrderChanged?.Invoke();
            _reordableList.OnDataChanged += () => OnDataChanged?.Invoke();
            Add(_reordableList);

            // 하단 버튼 영역
            var buttonContainer = new VisualElement();
            buttonContainer.style.flexDirection = FlexDirection.Row;
            buttonContainer.style.justifyContent = Justify.FlexEnd;
            buttonContainer.style.paddingTop = 8;

            var saveBtn = new UTKButton("저장", variant: UTKButton.ButtonVariant.Primary);
            saveBtn.OnClicked += OnSaveButtonClicked;
            buttonContainer.Add(saveBtn);

            Add(buttonContainer);
        }

        private void OnSaveButtonClicked()
        {
            List<Dictionary<string, string>> result = ToDictionary();
            foreach (var dict in result)
            {
                Debug.Log($"order={dict["order"]}, active={dict["active"]}, text={dict["text"]}");
            }
        }

        private void SubscribeToThemeChanges()
        {
            UTKThemeManager.Instance.OnThemeChanged += OnThemeChanged;
            RegisterCallback<AttachToPanelEvent>(OnAttachToPanelForTheme);
            RegisterCallback<DetachFromPanelEvent>(OnDetachFromPanelForTheme);
        }

        private void OnAttachToPanelForTheme(AttachToPanelEvent evt)
        {
            UTKThemeManager.Instance.OnThemeChanged -= OnThemeChanged;
            UTKThemeManager.Instance.OnThemeChanged += OnThemeChanged;
            UTKThemeManager.Instance.ApplyThemeToElement(this);
        }

        private void OnDetachFromPanelForTheme(DetachFromPanelEvent evt)
        {
            UTKThemeManager.Instance.OnThemeChanged -= OnThemeChanged;
        }

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

        #region Public API
        /// <summary>
        /// 데이터를 설정하고 리스트를 갱신합니다.
        /// </summary>
        /// <param name="items">표시할 아이템 데이터 목록.</param>
        public void SetData(List<ReordableListItemData> items)
        {
            _reordableList?.SetData(items);
        }

        /// <summary>
        /// List<Dictionary>로부터 데이터를 변환하여 설정합니다.
        /// Dictionary 키: "order" (순서), "active" (사용 유무), "text" (표시 내용)
        /// </summary>
        /// <param name="listDict">변환할 Dictionary 목록.</param>
        public void SetData(List<Dictionary<string, string>> listDict)
        {
            _reordableList?.SetData(listDict);
        }

        /// <summary>
        /// Order 값이 동기화된 데이터 목록을 반환합니다.
        /// </summary>
        /// <returns>현재 리스트 순서가 반영된 데이터 목록.</returns>
        public List<ReordableListItemData> GetData()
        {
            return _reordableList?.GetData() ?? new List<ReordableListItemData>();
        }

        /// <summary>
        /// 전체 아이템을 List<Dictionary<string, string>>로 변환하여 반환합니다.
        /// Dictionary 키: "order" (순서), "active" (사용 유무), "text" (표시 내용)
        /// </summary>
        /// <returns>각 아이템을 Dictionary로 변환한 목록.</returns>
        public List<Dictionary<string, string>> ToDictionary()
        {
            return _reordableList?.ToDictionary() ?? new List<Dictionary<string, string>>();
        }
        #endregion

        #region Sample
        /// <summary>
        /// Dictionary 기반 데이터 설정 및 조회 샘플.
        /// </summary>
        public void SampleSetAndGetWithDictionary()
        {
            // 1. Dictionary 데이터로 설정
            var listDict = new List<Dictionary<string, string>>
            {
                new() { ["order"] = "0", ["active"] = "True", ["text"] = "온도" },
                new() { ["order"] = "1", ["active"] = "False", ["text"] = "습도" },
                new() { ["order"] = "2", ["active"] = "True", ["text"] = "압력" },
            };
            SetData(listDict);

        }
        #endregion

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

            // 테마 구독 해제
            UTKThemeManager.Instance.OnThemeChanged -= OnThemeChanged;
            UnregisterCallback<AttachToPanelEvent>(OnAttachToPanelForTheme);
            UnregisterCallback<DetachFromPanelEvent>(OnDetachFromPanelForTheme);

            // ReordableList 정리
            _reordableList?.Dispose();
            _reordableList = null;

            // 이벤트 정리
            OnOrderChanged = null;
            OnDataChanged = null;
        }
        #endregion
    }
}