using Core;
using Core.SaveLoad;
using UnityEngine;

namespace UI.CardSystem.StateMachine.States
{
    /// <summary>
    /// Card is in pending face-down state in corner, awaiting drag.
    /// On drag start, queries AlbumViewPage for card data and slot, triggers page navigation,
    /// then flips and transitions to dragging revealed state.
    /// </summary>
    public class CardPendingFaceDownState : AppleState, ICardStateDragHandler
    {
        [Header("State-Owned Visuals")]
        [SerializeField] private GameObject cardBackVisual;
        
        private CardContext _context;
        private bool _isFlipping;
        private AlbumCardSlot _targetSlot;
        private bool _dragEndedDuringFlip = false; // Track if user released before card flip animation completed
        
        private void Awake()
        {
            _context = GetComponentInParent<CardContext>();
        }
        
        public override void OnEnterState()
        {
            if (_context == null) return;
            
            _isFlipping = false;
            _targetSlot = null;
            _dragEndedDuringFlip = false;
            
            // Reset scale to normal (in case transitioning from scaled state)
            _context.RootTransform.localScale = Vector3.one;
            
            // Show card back, hide card front
            if (cardBackVisual != null)
            {
                cardBackVisual.SetActive(true);
                cardBackVisual.transform.localRotation = Quaternion.Euler(0, 0, 0);
            }
            
            if (_context.CardDisplay != null)
            {
                _context.CardDisplay.gameObject.SetActive(false);
                _context.CardDisplay.transform.localRotation = Quaternion.Euler(0, 180, 0);
            }
        }
        
        /// <summary>
        /// Handle drag start - STATE ORCHESTRATES ITS OWN FLOW
        /// </summary>
        public bool OnCardDragStarted(CardContext context)
        {
            if (_isFlipping) return true; // Already handling
            
            // Get AlbumViewPage from context (injected dependency)
            var albumPage = context.AlbumViewPage;
            if (albumPage == null)
            {
                Logging.Warning("[CardPendingFaceDownState] AlbumViewPage not injected!");
                return true;
            }

            // Step 2: Ask AlbumViewPage what card to display and prompt it to rebuild
            var cardData = albumPage.GetCardForPendingSlot();
            if (cardData == null)
            {
                Logging.Warning("[CardPendingFaceDownState] No card data available from AlbumViewPage!");
                return true;
            }

            // Step 3: Apply card data to context
            // Use UpdateCardData instead of SetupCard to preserve OriginalScale
            // (card was already initialized with correct scale in SpawnCardInSlot)
            context.UpdateCardData(cardData);
            Logging.Debug($"[CardPendingFaceDownState] Assigned card data: {cardData.Name} ({cardData.Zone})");

            // Step 4: Ask AlbumViewPage for target slot
            _targetSlot = albumPage.GetTargetSlotForCard(cardData);
            if (_targetSlot == null)
            {
                Logging.Warning($"[CardPendingFaceDownState] No slot found for card {cardData.DefinitionId}");
                // Still flip and show card, but won't be able to place it
            }

            // Step 5: Request page navigation (no callback needed - AlbumViewPage tracks state)
            albumPage.NavigateToCardPage(cardData, null);

            // Step 6: Start card flip animation
            StartFlipAnimation();

            return true; // We handled it, prevent default DraggingState transition
        }
        

        /// <summary>
        /// Handle drag end - if card flip animation still in progress, flag it for next state
        /// </summary>
        public bool OnCardDragEnded(CardContext context)
        {
            if (_isFlipping)
            {
                // Card flip animation still in progress - user released immediately
                _dragEndedDuringFlip = true;
                Logging.Debug("[CardPendingFaceDownState] Drag ended during card flip - will pass to next state");
                return true; // We handled it
            }
            
            return false; // Already transitioned to DraggingRevealedState, let it handle
        }
        
        private void StartFlipAnimation()
        {
            _isFlipping = true;
            
            // Scale up from corner size to normal dragging size
            if (_context.Animator != null)
            {
                _context.Animator.AnimateScale(_context.OriginalScale * 1.15f, 0.3f);
            }
            
            // Play flip animation
            if (_context.Animator != null)
            {
                _context.Animator.PlayFlip(
                    cardBack: cardBackVisual != null ? cardBackVisual.transform : null,
                    cardFront: _context.CardDisplay != null ? _context.CardDisplay.transform : null,
                    onComplete: OnFlipComplete
                );
            }
            else
            {
                // No animator, just switch visibility immediately
                if (cardBackVisual != null) cardBackVisual.SetActive(false);
                if (_context.CardDisplay != null) _context.CardDisplay.gameObject.SetActive(true);
                OnFlipComplete();
            }
        }
        
        private void OnFlipComplete()
        {
            // Transition to dragging revealed state
            // Pass target slot to next state (it will query AlbumService for flip status)
            var card = _context.GetComponent<Card>();
            if (card != null)
            {
                var draggingState = card.GetStateComponent<CardDraggingRevealedState>(CardStateNames.DraggingRevealed);
                if (draggingState != null)
                {
                    draggingState.SetTargetSlot(_targetSlot);
                    
                    // If drag ended before we transitioned, tell next state to handle placement immediately
                    if (_dragEndedDuringFlip)
                    {
                        draggingState.SetDragAlreadyEnded(true);
                        Logging.Debug("[CardPendingFaceDownState] Passing drag-ended flag to DraggingRevealedState");
                    }
                }
            }

            _context.StateMachine.ChangeState(CardStateNames.DraggingRevealed);
        }
        
        private void OnDisable()
        {
            // Hide card back when leaving state
            if (cardBackVisual != null)
            {
                cardBackVisual.SetActive(false);
            }
        }
    }
}