using System.Collections.Generic;
using AppleHills.Data.CardSystem;
using Core;
using Data.CardSystem;
using Pixelplacement;
using UI.Core;
using UI.DragAndDrop.Core;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Serialization;

namespace UI.CardSystem
{
    /// <summary>
    /// UI page for viewing the player's card collection in an album.
    /// Manages booster pack button visibility and opening flow.
    /// </summary>
    public class AlbumViewPage : UIPage
    {
        [Header("UI References")]
        [SerializeField] private CanvasGroup canvasGroup;
        [SerializeField] private Button exitButton;
        [SerializeField] private BookCurlPro.BookPro book;
        
        [Header("Zone Navigation")]
        [SerializeField] private Transform tabContainer; // Container holding all BookTabButton children
        private BookTabButton[] _zoneTabs; // Discovered zone tab buttons
        
        [Header("Album Card Reveal")]
        [SerializeField] private SlotContainer bottomRightSlots;
        [FormerlySerializedAs("albumCardPlacementPrefab")]
        [SerializeField] private GameObject cardPrefab; // New Card prefab for placement
        
        [Header("Card Enlarge System")]
        [SerializeField] private GameObject cardEnlargedBackdrop; // Backdrop to block interactions
        [SerializeField] private Transform cardEnlargedContainer; // Container for enlarged cards (sits above backdrop)
        
        [Header("Booster Pack UI")]
        [SerializeField] private GameObject[] boosterPackButtons;
        [SerializeField] private BoosterOpeningPage boosterOpeningPage;
        
        private Input.InputMode _previousInputMode;
        private List<StateMachine.Card> _pendingCornerCards = new List<StateMachine.Card>();
        private const int MaxPendingCorner = 3;
        
        // Page flip tracking (for card placement coordination)
        private bool _isPageFlipping = false;
        
        /// <summary>
        /// Query method: Check if the book is currently flipping to a page.
        /// Used by card states to know if they should wait before placing.
        /// </summary>
        public bool IsPageFlipping => _isPageFlipping;
        
        internal override void OnManagedStart()
        {
            // Discover zone tabs from container
            DiscoverZoneTabs();
            
            // Make sure we have a CanvasGroup for transitions
            if (canvasGroup == null)
                canvasGroup = GetComponent<CanvasGroup>();
            if (canvasGroup == null)
                canvasGroup = gameObject.AddComponent<CanvasGroup>();
            
            // Hide backdrop initially
            if (cardEnlargedBackdrop != null)
            {
                cardEnlargedBackdrop.SetActive(false);
            }
            
            // Set up exit button
            if (exitButton != null)
            {
                exitButton.onClick.AddListener(OnExitButtonClicked);
            }
            
            // Set up booster pack button listeners
            SetupBoosterButtonListeners();
            
            // Subscribe to book page flip events
            if (book != null)
            {
                book.OnFlip.AddListener(OnPageFlipped);
                Logging.Debug("[AlbumViewPage] Subscribed to book.OnFlip event");
            }
            else
            {
                Logging.Warning("[AlbumViewPage] Book reference is null, cannot subscribe to OnFlip event!");
            }
            
            // Subscribe to CardSystemManager events (managers are guaranteed to be initialized)
            if (CardSystemManager.Instance != null)
            {
                CardSystemManager.Instance.OnBoosterCountChanged += OnBoosterCountChanged;
                // NOTE: OnPendingCardAdded is subscribed in TransitionIn, not here
                // This prevents spawning cards when page is not active
                
                // Update initial button visibility
                int initialCount = CardSystemManager.Instance.GetBoosterPackCount();
                UpdateBoosterButtons(initialCount);
            }
            
            // UI pages should start disabled
            gameObject.SetActive(false);
        }
        
        /// <summary>
        /// Discover all BookTabButton components from the tab container
        /// </summary>
        private void DiscoverZoneTabs()
        {
            if (tabContainer == null)
            {
                Debug.LogError("[AlbumViewPage] Tab container is not assigned! Cannot discover zone tabs.");
                _zoneTabs = new BookTabButton[0];
                return;
            }
            
            // Get all BookTabButton components from children
            _zoneTabs = tabContainer.GetComponentsInChildren<BookTabButton>(includeInactive: false);
            
            if (_zoneTabs == null || _zoneTabs.Length == 0)
            {
                Logging.Warning($"[AlbumViewPage] No BookTabButton components found in tab container '{tabContainer.name}'!");
                _zoneTabs = new BookTabButton[0];
            }
            else
            {
                Logging.Debug($"[AlbumViewPage] Discovered {_zoneTabs.Length} zone tabs from container '{tabContainer.name}'");
                foreach (var tab in _zoneTabs)
                {
                    Logging.Debug($"  - Tab: {tab.name}, Zone: {tab.Zone}, TargetPage: {tab.TargetPage}");
                }
            }
        }
        
        private void SetupBoosterButtonListeners()
        {
            if (boosterPackButtons == null) return;
            
            for (int i = 0; i < boosterPackButtons.Length; i++)
            {
                if (boosterPackButtons[i] == null) continue;

                
                Button button = boosterPackButtons[i].GetComponent<Button>();
                if (button != null)
                {
                    button.onClick.AddListener(OnBoosterButtonClicked);
                }
            }
        }

        internal override void OnManagedDestroy()
        {
            // Unsubscribe from book events
            if (book != null)
            {
                book.OnFlip.RemoveListener(OnPageFlipped);
            }
            
            // Unsubscribe from CardSystemManager
            if (CardSystemManager.Instance != null)
            {
                CardSystemManager.Instance.OnBoosterCountChanged -= OnBoosterCountChanged;
            }
            
            // Clean up exit button
            if (exitButton != null)
            {
                exitButton.onClick.RemoveListener(OnExitButtonClicked);
            }
            
            // Clean up booster button listeners
            if (boosterPackButtons != null)
            {
                foreach (var buttonObj in boosterPackButtons)
                {
                    if (buttonObj == null) continue;
                    
                    Button button = buttonObj.GetComponent<Button>();
                    if (button != null)
                    {
                        button.onClick.RemoveListener(OnBoosterButtonClicked);
                    }
                }
            }
            
            // Clean up pending corner cards
            CleanupPendingCornerCards();
        }

        private void OnExitButtonClicked()
        {
            if (book != null && book.CurrentPaper != 1)
            {
                // Not on page 0, flip to page 0 first
                BookCurlPro.AutoFlip autoFlip = book.GetComponent<BookCurlPro.AutoFlip>();
                if (autoFlip == null)
                {
                    autoFlip = book.gameObject.AddComponent<BookCurlPro.AutoFlip>();
                }
                
                autoFlip.enabled = true;
                autoFlip.StartFlipping(1);
            }
            else
            {
                // Already on page 0 or no book reference, exit
                // Restore input mode before popping
                if (Input.InputManager.Instance != null)
                {
                    Input.InputManager.Instance.SetInputMode(_previousInputMode);
                    Logging.Debug($"[AlbumViewPage] Restored input mode to {_previousInputMode} on exit");
                }
                
                if (UIPageController.Instance != null)
                {
                    UIPageController.Instance.PopPage();
                }
            }
        }
        
        private void OnBoosterCountChanged(int newCount)
        {
            UpdateBoosterButtons(newCount);
        }
        
        private void UpdateBoosterButtons(int boosterCount)
        {
            if (boosterPackButtons == null || boosterPackButtons.Length == 0) return;
            
            int visibleCount = Mathf.Min(boosterCount, boosterPackButtons.Length);
            
            for (int i = 0; i < boosterPackButtons.Length; i++)
            {
                if (boosterPackButtons[i] != null)
                {
                    boosterPackButtons[i].SetActive(i < visibleCount);
                }
            }
        }
        
        private void OnBoosterButtonClicked()
        {
            if (boosterOpeningPage != null && UIPageController.Instance != null)
            {
                // Pass current booster count to the opening page
                int boosterCount = CardSystemManager.Instance?.GetBoosterPackCount() ?? 0;
                boosterOpeningPage.SetAvailableBoosterCount(boosterCount);
                
                UIPageController.Instance.PushPage(boosterOpeningPage);
            }
        }
        
        public override void TransitionIn()
        {
            // Only store and switch input mode if this is the first time entering
            if (Input.InputManager.Instance != null)
            {
                // Store the current input mode before switching
                _previousInputMode = Input.InputMode.GameAndUI;
                Input.InputManager.Instance.SetInputMode(Input.InputMode.UI);
                Logging.Debug("[AlbumViewPage] Switched to UI-only input mode on first entry");
            }
            
            // Only spawn pending cards if we're already on an album page (not the menu)
            if (IsInAlbumProper())
            {
                Logging.Debug("[AlbumViewPage] Opening directly to album page - spawning cards immediately");
                SpawnPendingCornerCards();
            }
            else
            {
                Logging.Debug("[AlbumViewPage] Opening to menu page - cards will spawn when entering album");
            }
            
            base.TransitionIn();
        }
        
        public override void TransitionOut()
        {
            // Clean up active pending cards to prevent duplicates on next opening
            CleanupPendingCornerCards();
            
            // Don't restore input mode here - only restore when actually exiting (in OnExitButtonClicked)
            base.TransitionOut();
        }

        protected override void DoTransitionIn(System.Action onComplete)
        {
            // Simple fade in animation
            if (canvasGroup != null)
            {
                canvasGroup.alpha = 0f;
                Tween.Value(0f, 1f, (value) => canvasGroup.alpha = value, transitionDuration, 0f, Tween.EaseInOut, Tween.LoopType.None, null, onComplete, obeyTimescale: false);
            }
            else
            {
                // Fallback if no CanvasGroup
                onComplete?.Invoke();
            }
        }

        protected override void DoTransitionOut(System.Action onComplete)
        {
            // Clean up any enlarged card state before closing
            CleanupEnlargedCardState();
            
            // Simple fade out animation
            if (canvasGroup != null)
            {
                Tween.Value(canvasGroup.alpha, 0f, (value) => canvasGroup.alpha = value, transitionDuration, 0f, Tween.EaseInOut, Tween.LoopType.None, null, onComplete, obeyTimescale: false);
            }
            else
            {
                // Fallback if no CanvasGroup
                onComplete?.Invoke();
            }
        }
        
        /// <summary>
        /// Clean up enlarged card state when closing the album
        /// </summary>
        private void CleanupEnlargedCardState()
        {
            // Hide backdrop if visible
            if (cardEnlargedBackdrop != null && cardEnlargedBackdrop.activeSelf)
            {
                cardEnlargedBackdrop.SetActive(false);
            }
            
            // If there's an enlarged card in the container, return it to its slot
            if (cardEnlargedContainer != null && cardEnlargedContainer.childCount > 0)
            {
                for (int i = cardEnlargedContainer.childCount - 1; i >= 0; i--)
                {
                    Transform cardTransform = cardEnlargedContainer.GetChild(i);
                    var card = cardTransform.GetComponent<StateMachine.Card>();
                    var state = cardTransform.GetComponentInChildren<StateMachine.States.CardAlbumEnlargedState>(true);
                    if (card != null && state != null)
                    {
                        Transform originalParent = state.GetOriginalParent();
                        if (originalParent != null)
                        {
                            cardTransform.SetParent(originalParent, true);
                            cardTransform.localPosition = state.GetOriginalLocalPosition();
                            cardTransform.localRotation = state.GetOriginalLocalRotation();
                        }
                    }
                }
            }
        }
        
        /// <summary>
        /// Check if we're currently viewing the album proper (not the menu page)
        /// </summary>
        private bool IsInAlbumProper()
        {
            if (book == null)
            {
                Logging.Warning("[AlbumViewPage] Book reference is null in IsInAlbumProper check");
                return false;
            }
            
            // Page 1 is the menu/cover, page 2+ are album pages with card slots
            bool inAlbum = book.CurrentPaper > 1;
            return inAlbum;
        }
        
        /// <summary>
        /// Called when book page flips - show/hide pending cards based on whether we're in the album proper
        /// </summary>
        private void OnPageFlipped()
        {
            bool isInAlbum = IsInAlbumProper();
            if (isInAlbum && _pendingCornerCards.Count == 0)
            {
                // Entering album proper and no cards spawned yet - spawn them with animation
                Logging.Debug("[AlbumViewPage] Entering album proper - spawning pending cards with animation");
                SpawnPendingCornerCards();
            }
            else if (!isInAlbum && _pendingCornerCards.Count > 0)
            {
                // Returning to menu page - cleanup cards
                Logging.Debug("[AlbumViewPage] Returning to menu page - cleaning up pending cards");
                CleanupPendingCornerCards();
            }
            else
            {
                Logging.Debug($"[AlbumViewPage] Page flipped but no card state change needed (already in correct state)");
            }
        }
        
        #region Card Enlarge System (Album Slots)
        
        /// <summary>
        /// Subscribe to a placed card's enlarged state events to manage backdrop and reparenting.
        /// Called by AlbumCardSlot when it spawns an owned card in a slot.
        /// </summary>
        public void RegisterCardInAlbum(StateMachine.Card card)
        {
            if (card == null) return;
            var enlargeState = card.GetStateComponent<StateMachine.States.CardAlbumEnlargedState>("AlbumEnlargedState");
            if (enlargeState != null)
            {
                enlargeState.OnEnlargeRequested += OnCardEnlargeRequested;
                enlargeState.OnShrinkRequested += OnCardShrinkRequested;
            }
        }
        
        public void UnregisterCardInAlbum(StateMachine.Card card)
        {
            if (card == null) return;
            var enlargeState = card.GetStateComponent<StateMachine.States.CardAlbumEnlargedState>("AlbumEnlargedState");
            if (enlargeState != null)
            {
                enlargeState.OnEnlargeRequested -= OnCardEnlargeRequested;
                enlargeState.OnShrinkRequested -= OnCardShrinkRequested;
            }
        }
        
        private void OnCardEnlargeRequested(StateMachine.States.CardAlbumEnlargedState state)
        {
            if (state == null) return;
            // Show backdrop
            if (cardEnlargedBackdrop != null)
            {
                cardEnlargedBackdrop.SetActive(true);
            }
            // Reparent card root to enlarged container preserving world transform
            if (cardEnlargedContainer != null)
            {
                var ctx = state.GetComponentInParent<StateMachine.CardContext>();
                if (ctx != null)
                {
                    ctx.RootTransform.SetParent(cardEnlargedContainer, true);
                    ctx.RootTransform.SetAsLastSibling();
                }
            }
        }
        
        private void OnCardShrinkRequested(StateMachine.States.CardAlbumEnlargedState state)
        {
            if (state == null) return;
            // Hide backdrop; state will animate back to slot and reparent on completion
            if (cardEnlargedBackdrop != null)
            {
                cardEnlargedBackdrop.SetActive(false);
            }
            // Do not reparent here; reverse animation is orchestrated by the state
        }
        
        #endregion

        /// <summary>
        /// Find a slot by its SlotIndex property
        /// </summary>
        private DraggableSlot FindSlotByIndex(int slotIndex)
        {
            if (bottomRightSlots == null)
                return null;
            
            foreach (var slot in bottomRightSlots.Slots)
            {
                if (slot.SlotIndex == slotIndex)
                {
                    return slot;
                }
            }
            return null;
        }
        
        public void SpawnPendingCornerCards()
        {
            RebuildCornerCards();
        }
        
        /// <summary>
        /// Rebuild corner card display incrementally.
        /// Flow: 1) Shuffle remaining cards to front slots (0→1→2)
        ///       2) Spawn new card in last slot if needed
        /// Called on initial spawn and after card is removed.
        /// </summary>
        private void RebuildCornerCards()
        {
            if (cardPrefab == null || bottomRightSlots == null) return;
            
            // Step 1: Determine how many cards should be displayed
            var uniquePending = GetUniquePendingCards();
            int totalPendingCards = uniquePending.Count;
            int cardsToDisplay = Mathf.Min(totalPendingCards, MaxPendingCorner);
            
            int currentCardCount = _pendingCornerCards.Count;
            
            Logging.Debug($"[AlbumViewPage] RebuildCornerCards: current={currentCardCount}, target={cardsToDisplay}");
            
            // Step 2: Remove excess cards if we have too many
            while (_pendingCornerCards.Count > cardsToDisplay)
            {
                int lastIndex = _pendingCornerCards.Count - 1;
                var cardToRemove = _pendingCornerCards[lastIndex];
                
                if (cardToRemove != null)
                {
                    if (cardToRemove.Context != null)
                    {
                        cardToRemove.Context.OnDragStarted -= OnCardDragStarted;
                    }
                    Destroy(cardToRemove.gameObject);
                }
                
                _pendingCornerCards.RemoveAt(lastIndex);
                Logging.Debug($"[AlbumViewPage] Removed excess card, now have {_pendingCornerCards.Count}");
            }
            
            // Step 3: Shuffle remaining cards to occupy first slots (0, 1, 2)
            ShuffleCardsToFrontSlots();
            
            // Step 4: Spawn new cards in remaining slots if needed
            while (_pendingCornerCards.Count < cardsToDisplay)
            {
                int slotIndex = _pendingCornerCards.Count; // Next available slot
                var slot = FindSlotByIndex(slotIndex);
                
                if (slot == null)
                {
                    Logging.Warning($"[AlbumViewPage] Slot {slotIndex} not found, stopping spawn");
                    break;
                }
                
                SpawnCardInSlot(slot);
                Logging.Debug($"[AlbumViewPage] Added new card in slot {slotIndex}, now have {_pendingCornerCards.Count}");
            }
            
            if (cardsToDisplay == 0)
            {
                Logging.Debug("[AlbumViewPage] No pending cards to display in corner");
            }
        }
        
        /// <summary>
        /// Shuffle remaining cards to occupy the first available slots (0 → 1 → 2).
        /// Example: If we have 2 cards in slots 0 and 2, move the card from slot 2 to slot 1.
        /// </summary>
        private void ShuffleCardsToFrontSlots()
        {
            if (_pendingCornerCards.Count == 0) return;
            
            Logging.Debug($"[AlbumViewPage] Shuffling {_pendingCornerCards.Count} cards to front slots");
            
            // Reassign each card to the first N slots (0, 1, 2...)
            for (int i = 0; i < _pendingCornerCards.Count; i++)
            {
                var card = _pendingCornerCards[i];
                var targetSlot = FindSlotByIndex(i);
                
                if (targetSlot == null)
                {
                    Logging.Warning($"[AlbumViewPage] Could not find slot with index {i} during shuffle");
                    continue;
                }
                
                // Check if card is already in the correct slot
                if (card.CurrentSlot == targetSlot)
                {
                    // Already in correct slot, skip
                    continue;
                }
                
                // Vacate current slot if occupied
                if (card.CurrentSlot != null)
                {
                    card.CurrentSlot.Vacate();
                }
                
                // Assign to target slot with animation
                card.AssignToSlot(targetSlot, true); // true = animate
                Logging.Debug($"[AlbumViewPage] Shuffled card {i} to slot {targetSlot.SlotIndex}");
            }
        }
        
        /// <summary>
        /// Spawn a single card in the specified slot.
        /// Card will be in PendingFaceDownState and match slot transform.
        /// </summary>
        private void SpawnCardInSlot(DraggableSlot slot)
        {
            if (slot == null || cardPrefab == null) return;
            
            // Instantiate card as child of slot (not container)
            GameObject cardObj = Instantiate(cardPrefab, slot.transform);
            var card = cardObj.GetComponent<StateMachine.Card>();
            
            if (card == null)
            {
                Logging.Warning("[AlbumViewPage] Card prefab missing Card component!");
                Destroy(cardObj);
                return;
            }
            
            // IMPORTANT: Assign to slot FIRST (establishes correct transform)
            card.AssignToSlot(slot, false); // false = instant, no animation
            
            // THEN setup card for pending state (transitions to PendingFaceDownState)
            // This ensures OriginalScale is captured AFTER slot assignment
            card.SetupForAlbumPending();
            
            // Subscribe to drag events for reorganization
            card.Context.OnDragStarted += OnCardDragStarted;
            
            // Track in list
            _pendingCornerCards.Add(card);
            
            Logging.Debug($"[AlbumViewPage] Spawned card in slot {slot.SlotIndex}, state: {card.GetCurrentStateName()}");
        }
        
        /// <summary>
        /// Handle card drag started - cleanup and unparent from corner slot
        /// Rebuild happens in GetCardForPendingSlot after pending list is updated
        /// </summary>
        private void OnCardDragStarted(StateMachine.CardContext context)
        {
            if (context == null) return;
            
            var card = context.GetComponent<StateMachine.Card>();
            if (card == null) return;
            
            // Only handle pending corner cards
            if (!_pendingCornerCards.Contains(card)) return;
            
            Logging.Debug($"[AlbumViewPage] Card drag started, removing from corner");
            
            // 1. Remove from tracking (card is transitioning to placement flow)
            _pendingCornerCards.Remove(card);
            
            // 2. Unsubscribe from this card's events
            if (card.Context != null)
            {
                card.Context.OnDragStarted -= OnCardDragStarted;
            }
            
            // 3. CRITICAL: Unparent from corner slot BEFORE rebuild happens
            // This prevents the card from being destroyed when CleanupPendingCornerCards runs
            // Reparent to this page's transform (or canvas) to keep it alive during drag
            if (card.transform.parent != null)
            {
                card.transform.SetParent(transform, true); // Keep world position
                Logging.Debug($"[AlbumViewPage] Card unparented from corner slot - safe for rebuild");
            }
            
            // Note: RebuildCornerCards() is called in GetCardForPendingSlot()
            // after the card is removed from CardSystemManager's pending list
            // The card is now safe from being destroyed since it's no longer a child of corner slots
        }
        
        /// <summary>
        /// Get unique pending cards (one per definition+rarity combo)
        /// </summary>
        private List<CardData> GetUniquePendingCards()
        {
            if (CardSystemManager.Instance == null) return new List<CardData>();
            
            var pending = CardSystemManager.Instance.GetPendingRevealCards();
            
            // Group by definition+rarity, take first of each group
            var uniqueDict = new Dictionary<string, CardData>();
            int duplicateCount = 0;
            
            foreach (var card in pending)
            {
                string key = $"{card.DefinitionId}_{card.Rarity}";
                if (!uniqueDict.ContainsKey(key))
                {
                    uniqueDict[key] = card;
                }
                else
                {
                    duplicateCount++;
                }
            }
            
            if (duplicateCount > 0)
            {
                Logging.Warning($"[AlbumViewPage] Found {duplicateCount} duplicate pending cards (same definition+rarity combo)");
            }
            
            return new List<CardData>(uniqueDict.Values);
        }
        
        private void CleanupPendingCornerCards()
        {
            // First, unsubscribe and destroy tracked cards
            foreach (var c in _pendingCornerCards)
            {
                if (c != null)
                {
                    if (c.Context != null)
                    {
                        c.Context.OnDragStarted -= OnCardDragStarted;
                    }
                    Destroy(c.gameObject);
                }
            }
            _pendingCornerCards.Clear();
            
            // IMPORTANT: Also clear ALL children from corner slots
            // This catches cards that were removed from tracking but not destroyed
            // (e.g., cards being dragged to album)
            if (bottomRightSlots != null)
            {
                foreach (var slot in bottomRightSlots.Slots)
                {
                    if (slot == null || slot.transform == null) continue;
                    
                    // Destroy all card children in this slot
                    for (int i = slot.transform.childCount - 1; i >= 0; i--)
                    {
                        var child = slot.transform.GetChild(i);
                        var card = child.GetComponent<StateMachine.Card>();
                        if (card != null)
                        {
                            // Unsubscribe if somehow still subscribed
                            if (card.Context != null)
                            {
                                card.Context.OnDragStarted -= OnCardDragStarted;
                            }
                            Destroy(child.gameObject);
                            Logging.Debug($"[AlbumViewPage] Cleaned up orphaned card from slot {slot.SlotIndex}");
                        }
                    }
                }
            }
        }
        
        #region Query Methods for Card States (Data Providers)
        
        /// <summary>
        /// Query method: Get card data for a pending slot.
        /// Called by PendingFaceDownState when drag starts.
        /// IMPORTANT: This removes the card from pending list immediately, then rebuilds corner.
        /// </summary>
        public CardData GetCardForPendingSlot()
        {
            if (CardSystemManager.Instance == null) return null;
            var pending = CardSystemManager.Instance.GetPendingRevealCards();
            if (pending.Count == 0) return null;
            
            // Try current page match
            var pageDefs = GetDefinitionsOnCurrentPage();
            var match = pending.Find(c => pageDefs.Contains(c.DefinitionId));
            
            // If no match, use random
            if (match == null)
            {
                int idx = Random.Range(0, pending.Count);
                match = pending[idx];
            }
            
            // IMPORTANT: Remove from pending list immediately
            // Card is now in "reveal flow" and will be added to collection when placed
            if (match != null)
            {
                // Remove from pending using the manager (fires OnPendingCardRemoved event)
                CardSystemManager.Instance.RemoveFromPending(match);
                Logging.Debug($"[AlbumViewPage] Removed '{match.Name}' from pending cards, starting reveal flow");
                
                // Rebuild corner cards AFTER removing from pending list
                // This ensures the removed card doesn't get re-spawned
                RebuildCornerCards();
            }
            
            return match;
        }
        
        /// <summary>
        /// Query method: Get target slot for a card.
        /// Called by PendingFaceDownState to find where card should go.
        /// </summary>
        public AlbumCardSlot GetTargetSlotForCard(CardData cardData)
        {
            if (cardData == null) return null;
            
            var allSlots = FindObjectsByType<AlbumCardSlot>(FindObjectsSortMode.None);
            
            foreach (var slot in allSlots)
            {
                if (slot.TargetCardDefinition != null && 
                    slot.TargetCardDefinition.Id == cardData.DefinitionId)
                {
                    return slot;
                }
            }
            
            return null;
        }
        
        /// <summary>
        /// Service method: Navigate to the page for a specific card.
        /// Called by PendingFaceDownState to flip book to correct zone page.
        /// </summary>
        public void NavigateToCardPage(CardData cardData, System.Action onComplete)
        {
            if (cardData == null || book == null)
            {
                onComplete?.Invoke();
                return;
            }
            
            // Find target page based on card's zone
            int targetPage = FindPageForZone(cardData.Zone);
            
            if (targetPage < 0)
            {
                Logging.Warning($"[AlbumViewPage] No page found for zone {cardData.Zone}");
                onComplete?.Invoke();
                return;
            }
            
            // Mark as flipping
            _isPageFlipping = true;
            Logging.Debug($"[AlbumViewPage] Starting page flip to page {targetPage}");
            
            // Get or add AutoFlip component
            BookCurlPro.AutoFlip autoFlip = book.GetComponent<BookCurlPro.AutoFlip>();
            if (autoFlip == null)
            {
                autoFlip = book.gameObject.AddComponent<BookCurlPro.AutoFlip>();
            }
            
            // Start flipping with callback
            autoFlip.enabled = true;
            autoFlip.StartFlipping(targetPage, () => 
            {
                // Mark as complete
                _isPageFlipping = false;
                Logging.Debug($"[AlbumViewPage] Page flip to {targetPage} completed");
                
                // Call original callback if provided
                onComplete?.Invoke();
            });
        }
        
        /// <summary>
        /// Notify that a card has been placed (for cleanup).
        /// Called by PlacedInSlotState after placement is complete.
        /// </summary>
        public void NotifyCardPlaced(StateMachine.Card card)
        {
            if (card != null)
            {
                // Remove from tracking list
                _pendingCornerCards.Remove(card);
                
                // IMPORTANT: Unsubscribe from drag events
                // Placed cards should never respond to AlbumViewPage drag events
                if (card.Context != null)
                {
                    card.Context.OnDragStarted -= OnCardDragStarted;
                }
                
                // Register for enlarge/shrink functionality
                RegisterCardInAlbum(card);
                
                Logging.Debug($"[AlbumViewPage] Card placed and unsubscribed from corner events: {card.CardData?.Name}");
            }
        }
        
        #endregion
        
        #region Helper Methods
        
        /// <summary>
        /// Find the target page for a card zone using BookTabButtons
        /// </summary>
        private int FindPageForZone(CardZone zone)
        {
            if (_zoneTabs == null || _zoneTabs.Length == 0)
            {
                Logging.Warning("[AlbumViewPage] No zone tabs discovered!");
                return -1;
            }
            
            foreach (var tab in _zoneTabs)
            {
                if (tab.Zone == zone)
                {
                    return tab.TargetPage;
                }
            }
            
            Logging.Warning($"[AlbumViewPage] No BookTabButton found for zone {zone}");
            return -1;
        }
        
        private List<string> GetDefinitionsOnCurrentPage()
        {
            var result = new List<string>();
            if (book == null) return result;
            
            int currentPage = book.CurrentPaper;
            
            // Find all AlbumCardSlot in scene
            var allSlots = FindObjectsByType<AlbumCardSlot>(FindObjectsSortMode.None);
            
            foreach (var slot in allSlots)
            {
                if (IsSlotOnPage(slot.transform, currentPage))
                {
                    if (slot.TargetCardDefinition != null && !string.IsNullOrEmpty(slot.TargetCardDefinition.Id))
                    {
                        result.Add(slot.TargetCardDefinition.Id);
                    }
                }
            }
            
            return result;
        }
        
        private bool IsSlotOnPage(Transform slotTransform, int pageIndex)
        {
            if (book == null || book.papers == null || pageIndex < 0 || pageIndex >= book.papers.Length)
                return false;
            
            var paper = book.papers[pageIndex];
            if (paper == null) return false;
            
            // Check if slotTransform parent hierarchy contains paper.Front or paper.Back
            Transform current = slotTransform;
            while (current != null)
            {
                if ((paper.Front != null && current.gameObject == paper.Front) || 
                    (paper.Back != null && current.gameObject == paper.Back))
                    return true;
                current = current.parent;
            }
            
            return false;
        }
        
        #endregion
    }
}