XRLib/Assets/Scripts/UVC/UIToolkit/Modal/UTKAlert.cs

#nullable enable
using System;
using Cysharp.Threading.Tasks;
using UnityEngine;
using UnityEngine.UIElements;

namespace UVC.UIToolkit
{
    /// <summary>
    /// Alert 팝업 컴포넌트.
    /// 사용자에게 중요한 정보를 알립니다.
    /// </summary>
    /// <example>
    /// <para><b>C# 코드에서 사용:</b></para>
    /// <code>
    /// // 초기화 (root 설정 필요)
    /// UTKAlert.Initialize(rootVisualElement);
    /// 
    /// // 기본 알림
    /// await UTKAlert.Show("알림", "작업이 완료되었습니다.");
    /// 
    /// // 확인 대화상자
    /// bool confirmed = await UTKAlert.ShowConfirm("삭제 확인", "정말 삭제하시겠습니까?");
    /// if (confirmed) {
    ///     // 삭제 실행
    /// }
    /// 
    /// // 타입별 알림
    /// await UTKAlert.ShowSuccess("성공", "저장되었습니다.");
    /// await UTKAlert.ShowError("오류", "파일을 찾을 수 없습니다.");
    /// await UTKAlert.ShowWarning("경고", "변경사항이 저장되지 않았습니다.");
    /// </code>
    /// <para><b>UXML에서 사용:</b></para>
    /// <code>
    /// <ui:UXML xmlns:utk="UVC.UIToolkit">
    ///     <!-- Alert는 주로 C# 코드로 동적 생성합니다 -->
    ///     <utk:UTKAlert Title="알림" Message="메시지" AlertType="Info" />
    /// </ui:UXML>
    /// </code>
    /// </example>
    [UxmlElement]
    public partial class UTKAlert : VisualElement, IDisposable
    {
        #region Constants
        private const string USS_PATH = "UIToolkit/Modal/UTKAlert";
        #endregion

        #region Fields
        private static VisualElement? _root;

        private bool _disposed;
        private UTKModalBlocker? _blocker;
        private Label? _titleLabel;
        private Label? _messageLabel;
        private VisualElement? _buttonContainer;

        private string _title = "";
        private string _message = "";
        private AlertType _alertType = AlertType.Info;
        private string _confirmLabel = "OK";
        private string _cancelLabel = "Cancel";

        private EventCallback<KeyDownEvent>? _keyDownCallback;
        private VisualElement? _keyEventTarget;
        #endregion

        #region Events
        /// <summary>닫힘 이벤트</summary>
        public event Action? OnClosed;
        /// <summary>확인 이벤트</summary>
        public event Action? OnConfirm;
        /// <summary>취소 이벤트</summary>
        public event Action? OnCancel;
        #endregion

        #region Properties
        /// <summary>제목</summary>
        [UxmlAttribute]
        public string Title
        {
            get => _title;
            set
            {
                _title = value;
                if (_titleLabel != null)
                {
                    _titleLabel.text = value;
                    _titleLabel.style.display = string.IsNullOrEmpty(value) ? DisplayStyle.None : DisplayStyle.Flex;
                }
            }
        }

        /// <summary>메시지</summary>
        [UxmlAttribute]
        public string Message
        {
            get => _message;
            set
            {
                _message = value;
                if (_messageLabel != null) _messageLabel.text = value;
            }
        }

        /// <summary>알림 유형</summary>
        [UxmlAttribute]
        public AlertType Type
        {
            get => _alertType;
            set
            {
                _alertType = value;
                UpdateType();
            }
        }
        #endregion

        #region Enums
        public enum AlertType
        {
            Info,
            Success,
            Warning,
            Error,
            Confirm
        }
        #endregion

        #region Constructor
        public UTKAlert()
        {
            UTKThemeManager.Instance.ApplyThemeToElement(this);

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

            CreateUI();
            SubscribeToThemeChanges();
        }

        public UTKAlert(string title, string message, AlertType type = AlertType.Info) : this()
        {
            Title = title;
            Message = message;
            Type = type;
        }
        #endregion

        #region Static Methods
        /// <summary>
        /// 기본 루트 요소 설정
        /// </summary>
        /// <param name="root">Alert를 표시할 기본 루트 요소</param>
        public static void SetRoot(VisualElement root)
        {
            _root = root;
        }

        /// <summary>
        /// 기본 루트 요소 반환
        /// </summary>
        public static VisualElement? GetRoot() => _root;
        #endregion

        #region Static Factory (without parent)
        /// <summary>
        /// Info 알림 표시 (SetRoot로 설정된 루트 사용)
        /// </summary>
        public static UTKAlert ShowInfo(string title, string message, Action? onClose = null, bool closeOnBlockerClick = false, string confirmLabel = "OK")
        {
            ValidateRoot();
            return Show(_root!, title, message, AlertType.Info, onClose, closeOnBlockerClick, confirmLabel);
        }

        /// <summary>
        /// Success 알림 표시 (SetRoot로 설정된 루트 사용)
        /// </summary>
        public static UTKAlert ShowSuccess(string title, string message, Action? onClose = null, bool closeOnBlockerClick = false, string confirmLabel = "OK")
        {
            ValidateRoot();
            return Show(_root!, title, message, AlertType.Success, onClose, closeOnBlockerClick, confirmLabel);
        }

        /// <summary>
        /// Warning 알림 표시 (SetRoot로 설정된 루트 사용)
        /// </summary>
        public static UTKAlert ShowWarning(string title, string message, Action? onClose = null, bool closeOnBlockerClick = false, string confirmLabel = "OK")
        {
            ValidateRoot();
            return Show(_root!, title, message, AlertType.Warning, onClose, closeOnBlockerClick, confirmLabel);
        }

        /// <summary>
        /// Error 알림 표시 (SetRoot로 설정된 루트 사용)
        /// </summary>
        public static UTKAlert ShowError(string title, string message, Action? onClose = null, bool closeOnBlockerClick = false, string confirmLabel = "OK")
        {
            ValidateRoot();
            return Show(_root!, title, message, AlertType.Error, onClose, closeOnBlockerClick, confirmLabel);
        }

        /// <summary>
        /// Confirm 대화상자 표시 (SetRoot로 설정된 루트 사용)
        /// </summary>
        public static UTKAlert ShowConfirm(string title, string message, Action? onConfirm, Action? onCancel = null, bool closeOnBlockerClick = false, string confirmLabel = "OK", string cancelLabel = "Cancel")
        {
            ValidateRoot();
            var alert = Show(_root!, title, message, AlertType.Confirm, null, closeOnBlockerClick, confirmLabel, cancelLabel);
            alert.OnConfirm = onConfirm;
            alert.OnCancel = onCancel;
            return alert;
        }

        /// <summary>
        /// 알림 표시 (SetRoot로 설정된 루트 사용)
        /// </summary>
        public static UTKAlert Show(string title, string message, AlertType type = AlertType.Info, Action? onClose = null, bool closeOnBlockerClick = false, string confirmLabel = "OK", string cancelLabel = "Cancel")
        {
            ValidateRoot();
            return Show(_root!, title, message, type, onClose, closeOnBlockerClick, confirmLabel, cancelLabel);
        }

        private static void ValidateRoot()
        {
            if (_root == null)
            {
                throw new InvalidOperationException("UTKAlert.SetRoot()를 먼저 호출하여 기본 루트 요소를 설정해야 합니다.");
            }
        }
        #endregion

        #region Static Factory Async (without parent)
        /// <summary>
        /// Info 알림 표시 (비동기, SetRoot로 설정된 루트 사용)
        /// </summary>
        public static UniTask ShowInfoAsync(string title, string message, bool closeOnBlockerClick = false, string confirmLabel = "OK")
        {
            ValidateRoot();
            return ShowAsync(_root!, title, message, AlertType.Info, closeOnBlockerClick, confirmLabel);
        }

        /// <summary>
        /// Success 알림 표시 (비동기, SetRoot로 설정된 루트 사용)
        /// </summary>
        public static UniTask ShowSuccessAsync(string title, string message, bool closeOnBlockerClick = false, string confirmLabel = "OK")
        {
            ValidateRoot();
            return ShowAsync(_root!, title, message, AlertType.Success, closeOnBlockerClick, confirmLabel);
        }

        /// <summary>
        /// Warning 알림 표시 (비동기, SetRoot로 설정된 루트 사용)
        /// </summary>
        public static UniTask ShowWarningAsync(string title, string message, bool closeOnBlockerClick = false, string confirmLabel = "OK")
        {
            ValidateRoot();
            return ShowAsync(_root!, title, message, AlertType.Warning, closeOnBlockerClick, confirmLabel);
        }

        /// <summary>
        /// Error 알림 표시 (비동기, SetRoot로 설정된 루트 사용)
        /// </summary>
        public static UniTask ShowErrorAsync(string title, string message, bool closeOnBlockerClick = false, string confirmLabel = "OK")
        {
            ValidateRoot();
            return ShowAsync(_root!, title, message, AlertType.Error, closeOnBlockerClick, confirmLabel);
        }

        /// <summary>
        /// Confirm 대화상자 표시 (비동기, SetRoot로 설정된 루트 사용)
        /// </summary>
        /// <returns>확인 버튼 클릭 시 true, 취소 버튼 클릭 시 false</returns>
        public static UniTask<bool> ShowConfirmAsync(string title, string message, bool closeOnBlockerClick = false, string confirmLabel = "OK", string cancelLabel = "Cancel")
        {
            ValidateRoot();
            return ShowConfirmAsync(_root!, title, message, closeOnBlockerClick, confirmLabel, cancelLabel);
        }
        #endregion

        #region Static Factory Async (with parent)
        /// <summary>
        /// Info 알림 표시 (비동기)
        /// </summary>
        public static UniTask ShowInfoAsync(VisualElement parent, string title, string message, bool closeOnBlockerClick = false, string confirmLabel = "OK")
        {
            return ShowAsync(parent, title, message, AlertType.Info, closeOnBlockerClick, confirmLabel);
        }

        /// <summary>
        /// Success 알림 표시 (비동기)
        /// </summary>
        public static UniTask ShowSuccessAsync(VisualElement parent, string title, string message, bool closeOnBlockerClick = false, string confirmLabel = "OK")
        {
            return ShowAsync(parent, title, message, AlertType.Success, closeOnBlockerClick, confirmLabel);
        }

        /// <summary>
        /// Warning 알림 표시 (비동기)
        /// </summary>
        public static UniTask ShowWarningAsync(VisualElement parent, string title, string message, bool closeOnBlockerClick = false, string confirmLabel = "OK")
        {
            return ShowAsync(parent, title, message, AlertType.Warning, closeOnBlockerClick, confirmLabel);
        }

        /// <summary>
        /// Error 알림 표시 (비동기)
        /// </summary>
        public static UniTask ShowErrorAsync(VisualElement parent, string title, string message, bool closeOnBlockerClick = false, string confirmLabel = "OK")
        {
            return ShowAsync(parent, title, message, AlertType.Error, closeOnBlockerClick, confirmLabel);
        }

        /// <summary>
        /// Confirm 대화상자 표시 (비동기)
        /// </summary>
        /// <returns>확인 버튼 클릭 시 true, 취소 버튼 클릭 시 false</returns>
        public static UniTask<bool> ShowConfirmAsync(VisualElement parent, string title, string message, bool closeOnBlockerClick = false, string confirmLabel = "OK", string cancelLabel = "Cancel")
        {
            var tcs = new UniTaskCompletionSource<bool>();
            var alert = Show(parent, title, message, AlertType.Confirm, null, closeOnBlockerClick, confirmLabel, cancelLabel);
            alert.OnConfirm = () => tcs.TrySetResult(true);
            alert.OnCancel = () => tcs.TrySetResult(false);
            alert.OnClosed = () => tcs.TrySetResult(false);
            return tcs.Task;
        }

        /// <summary>
        /// 알림 표시 (비동기)
        /// </summary>
        public static UniTask ShowAsync(VisualElement parent, string title, string message, AlertType type, bool closeOnBlockerClick = false, string confirmLabel = "OK", string cancelLabel = "Cancel")
        {
            var tcs = new UniTaskCompletionSource();
            var alert = Show(parent, title, message, type, () => tcs.TrySetResult(), closeOnBlockerClick, confirmLabel, cancelLabel);
            return tcs.Task;
        }
        #endregion

        #region Static Factory (with parent)
        /// <summary>
        /// Info 알림 표시
        /// </summary>
        public static UTKAlert ShowInfo(VisualElement parent, string title, string message, Action? onClose = null, bool closeOnBlockerClick = false, string confirmLabel = "OK")
        {
            return Show(parent, title, message, AlertType.Info, onClose, closeOnBlockerClick, confirmLabel);
        }

        /// <summary>
        /// Success 알림 표시
        /// </summary>
        public static UTKAlert ShowSuccess(VisualElement parent, string title, string message, Action? onClose = null, bool closeOnBlockerClick = false, string confirmLabel = "OK")
        {
            return Show(parent, title, message, AlertType.Success, onClose, closeOnBlockerClick, confirmLabel);
        }

        /// <summary>
        /// Warning 알림 표시
        /// </summary>
        public static UTKAlert ShowWarning(VisualElement parent, string title, string message, Action? onClose = null, bool closeOnBlockerClick = false, string confirmLabel = "OK")
        {
            return Show(parent, title, message, AlertType.Warning, onClose, closeOnBlockerClick, confirmLabel);
        }

        /// <summary>
        /// Error 알림 표시
        /// </summary>
        public static UTKAlert ShowError(VisualElement parent, string title, string message, Action? onClose = null, bool closeOnBlockerClick = false, string confirmLabel = "OK")
        {
            return Show(parent, title, message, AlertType.Error, onClose, closeOnBlockerClick, confirmLabel);
        }

        /// <summary>
        /// Confirm 대화상자 표시
        /// </summary>
        public static UTKAlert ShowConfirm(VisualElement parent, string title, string message, Action? onConfirm, Action? onCancel = null, bool closeOnBlockerClick = false, string confirmLabel = "OK", string cancelLabel = "Cancel")
        {
            var alert = Show(parent, title, message, AlertType.Confirm, null, closeOnBlockerClick, confirmLabel, cancelLabel);
            alert.OnConfirm = onConfirm;
            alert.OnCancel = onCancel;
            return alert;
        }

        /// <summary>
        /// 알림 표시
        /// </summary>
        /// <param name="parent">부모 요소</param>
        /// <param name="title">제목</param>
        /// <param name="message">메시지</param>
        /// <param name="type">알림 유형</param>
        /// <param name="onClose">닫힘 콜백</param>
        /// <param name="closeOnBlockerClick">배경 클릭 시 닫힘 여부</param>
        /// <param name="confirmLabel">확인 버튼 레이블</param>
        /// <param name="cancelLabel">취소 버튼 레이블 (Confirm 타입에서만 사용)</param>
        public static UTKAlert Show(VisualElement parent, string title, string message, AlertType type, Action? onClose, bool closeOnBlockerClick = false, string confirmLabel = "OK", string cancelLabel = "Cancel")
        {
            var alert = new UTKAlert(title, message, type);
            alert.OnClosed = onClose;
            alert._confirmLabel = confirmLabel;
            alert._cancelLabel = cancelLabel;
            alert.UpdateButtons();

            alert._blocker = UTKModalBlocker.Show(parent, 0.5f, closeOnBlockerClick);
            if (closeOnBlockerClick)
            {
                alert._blocker.OnBlockerClicked += alert.Close;
            }
            else
            {
                // closeOnBlockerClick이 false일 때 blocker 클릭 시 Alert로 포커스 유지
                alert._blocker.OnBlockerClicked += () => alert.Focus();
            }
            alert._blocker.Add(alert);

            // 중앙 정렬
            alert.style.position = Position.Absolute;
            alert.style.left = Length.Percent(50);
            alert.style.top = Length.Percent(50);
            alert.style.translate = new Translate(Length.Percent(-50), Length.Percent(-50));

            // ESC 키 이벤트 등록
            alert.RegisterEscapeKey(parent);

            // Alert에 포커스 설정 (키보드 이벤트 수신을 위해)
            alert.focusable = true;
            alert.schedule.Execute(() => alert.Focus());

            return alert;
        }
        #endregion

        #region UI Creation
        private void CreateUI()
        {
            AddToClassList("utk-alert");

            // Title (상단 왼쪽)
            _titleLabel = new Label { name = "title" };
            _titleLabel.AddToClassList("utk-alert__title");
            Add(_titleLabel);

            // Content (가운데 메시지)
            var contentContainer = new VisualElement { name = "content" };
            contentContainer.AddToClassList("utk-alert__content");
            Add(contentContainer);

            _messageLabel = new Label { name = "message" };
            _messageLabel.AddToClassList("utk-alert__message");
            contentContainer.Add(_messageLabel);

            // Buttons
            _buttonContainer = new VisualElement { name = "buttons" };
            _buttonContainer.AddToClassList("utk-alert__buttons");
            Add(_buttonContainer);

            UpdateType();
        }

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

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

        #region Methods
        private void UpdateType()
        {
            RemoveFromClassList("utk-alert--info");
            RemoveFromClassList("utk-alert--success");
            RemoveFromClassList("utk-alert--warning");
            RemoveFromClassList("utk-alert--error");
            RemoveFromClassList("utk-alert--confirm");

            var typeClass = _alertType switch
            {
                AlertType.Success => "utk-alert--success",
                AlertType.Warning => "utk-alert--warning",
                AlertType.Error => "utk-alert--error",
                AlertType.Confirm => "utk-alert--confirm",
                _ => "utk-alert--info"
            };
            AddToClassList(typeClass);

            // 버튼 업데이트
            UpdateButtons();
        }

        private void UpdateButtons()
        {
            if (_buttonContainer == null) return;

            _buttonContainer.Clear();

            if (_alertType == AlertType.Confirm)
            {
                var cancelBtn = new UTKButton(_cancelLabel, "", UTKButton.ButtonVariant.Normal);
                cancelBtn.AddToClassList("utk-alert__btn");
                cancelBtn.OnClicked += () =>
                {
                    OnCancel?.Invoke();
                    Close();
                };
                _buttonContainer.Add(cancelBtn);

                var confirmBtn = new UTKButton(_confirmLabel, "", UTKButton.ButtonVariant.Primary);
                confirmBtn.AddToClassList("utk-alert__btn");
                confirmBtn.OnClicked += () =>
                {
                    OnConfirm?.Invoke();
                    Close();
                };
                _buttonContainer.Add(confirmBtn);
            }
            else
            {
                var okBtn = new UTKButton(_confirmLabel, "", UTKButton.ButtonVariant.Primary);
                okBtn.AddToClassList("utk-alert__btn");
                okBtn.OnClicked += Close;
                _buttonContainer.Add(okBtn);
            }
        }

        /// <summary>
        /// ESC 키 이벤트 등록
        /// </summary>
        private void RegisterEscapeKey(VisualElement parent)
        {
            _keyEventTarget = parent;
            _keyDownCallback = evt =>
            {
                if (evt.keyCode == KeyCode.Escape)
                {
                    evt.StopPropagation();
                    HandleEscapeKey();
                }
            };

            // 패널에 키 이벤트 등록 (포커스와 관계없이 캡처)
            _keyEventTarget.RegisterCallback(_keyDownCallback, TrickleDown.TrickleDown);
        }

        /// <summary>
        /// ESC 키 해제
        /// </summary>
        private void UnregisterEscapeKey()
        {
            if (_keyDownCallback != null && _keyEventTarget != null)
            {
                _keyEventTarget.UnregisterCallback(_keyDownCallback, TrickleDown.TrickleDown);
                _keyDownCallback = null;
                _keyEventTarget = null;
            }
        }

        /// <summary>
        /// ESC 키 처리
        /// </summary>
        private void HandleEscapeKey()
        {
            if (_alertType == AlertType.Confirm)
            {
                // Confirm 타입: 취소 처리
                OnCancel?.Invoke();
            }
            Close();
        }

        /// <summary>
        /// 알림 닫기
        /// </summary>
        public void Close()
        {
            UnregisterEscapeKey();
            OnClosed?.Invoke();
            if (_blocker != null)
            {
                _blocker.OnBlockerClicked -= Close;
                _blocker.Hide();
            }
            _blocker = null;
        }
        #endregion

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

            UTKThemeManager.Instance.OnThemeChanged -= OnThemeChanged;
            OnClosed = null;
            OnConfirm = null;
            OnCancel = null;
            _blocker = null;
        }
        #endregion
    }
}