using Core;
using Core.SaveLoad;
using UnityEngine;

namespace UI.CardSystem.StateMachine.States
{
    /// <summary>
    /// Dragging revealed state for pending cards after flip.
    /// Shows card front without badges, handles transition to placement after drag release.
    /// Queries AlbumViewPage for page flip status instead of tracking state internally.
    /// </summary>
    public class CardDraggingRevealedState : AppleState, ICardStateDragHandler
    {
        private CardContext _context;
        private Vector3 _originalScale;
        
        // Placement info passed from PendingFaceDownState
        private AlbumCardSlot _targetSlot;
        private bool _dragAlreadyEnded = false; // Track if drag ended before we entered this state (instant-release case)
        
        private void Awake()
        {
            _context = GetComponentInParent<CardContext>();
        }
        
        /// <summary>
        /// Set target slot from previous state
        /// Called by PendingFaceDownState before transition
        /// </summary>
        public void SetTargetSlot(AlbumCardSlot targetSlot)
        {
            _targetSlot = targetSlot;
        }
        
        /// <summary>
        /// Set flag indicating drag already ended before entering this state
        /// Called by PendingFaceDownState for instant-release case
        /// </summary>
        public void SetDragAlreadyEnded(bool ended)
        {
            _dragAlreadyEnded = ended;
        }
        
        public override void OnEnterState()
        {
            if (_context == null) return;
            if (_context.CardDisplay != null)
            {
                _context.CardDisplay.gameObject.SetActive(true);
                _context.CardDisplay.transform.localRotation = Quaternion.Euler(0,0,0);
            }
            _originalScale = _context.RootTransform.localScale;
            _context.RootTransform.localScale = _originalScale * 1.15f;
            
            // Check if drag already ended before we entered this state (instant-release case)
            if (_dragAlreadyEnded)
            {
                Logging.Debug("[CardDraggingRevealedState] Drag ended before state entry - handling placement immediately");
                _dragAlreadyEnded = false; // Clear flag
                HandlePlacement();
            }
        }
        
        /// <summary>
        /// Already in dragging state, nothing to do
        /// </summary>
        public bool OnCardDragStarted(CardContext ctx)
        {
            return true; // Prevent default DraggingState transition
        }
        
        /// <summary>
        /// Handle drag end - query AlbumViewPage for page flip status and place accordingly
        /// </summary>
        public bool OnCardDragEnded(CardContext ctx)
        {
            HandlePlacement();
            return true;
        }
        
        /// <summary>
        /// Handle card placement logic - called from OnCardDragEnded or OnEnterState (instant-release)
        /// </summary>
        private void HandlePlacement()
        {
            if (_targetSlot == null)
            {
                Logging.Warning("[CardDraggingRevealedState] No target slot set - cannot place card");
                // Return to corner
                _context.StateMachine.ChangeState(CardStateNames.PendingFaceDown);
                return;
            }
            
            // Query AlbumViewPage for page flip status
            var albumPage = _context.AlbumViewPage;
            if (albumPage == null)
            {
                Logging.Warning("[CardDraggingRevealedState] AlbumViewPage not injected - placing immediately");
                TransitionToPlacement(_context);
                return;
            }

            // Check if page is still flipping
            if (albumPage.IsPageFlipping)
            {
                // Wait for flip to complete
                Logging.Debug("[CardDraggingRevealedState] Page still flipping - waiting before placement");
                StartCoroutine(WaitForPageFlipThenPlace(_context, albumPage));
            }
            else
            {
                // Flip already done - place immediately
                Logging.Debug("[CardDraggingRevealedState] Page flip complete - placing card immediately");
                TransitionToPlacement(_context);
            }
        }
        
        private System.Collections.IEnumerator WaitForPageFlipThenPlace(CardContext ctx, AlbumViewPage albumPage)
        {
            // Wait until page flip completes (max 0.5 seconds timeout)
            float timeout = 0.5f;
            float elapsed = 0f;
            
            while (albumPage.IsPageFlipping && elapsed < timeout)
            {
                yield return null;
                elapsed += Time.deltaTime;
            }
            
            if (elapsed >= timeout)
            {
                Logging.Warning("[CardDraggingRevealedState] Page flip wait timed out");
            }
            else
            {
                Logging.Debug("[CardDraggingRevealedState] Page flip completed, placing card");
            }
            
            // Now place the card
            TransitionToPlacement(ctx);
        }
        
        private void TransitionToPlacement(CardContext ctx)
        {
            // Pass target slot to PlacedInSlotState
            var card = ctx.GetComponent<Card>();
            if (card != null)
            {
                var placedState = card.GetStateComponent<CardPlacedInSlotState>(CardStateNames.PlacedInSlot);
                if (placedState != null)
                {
                    placedState.SetPlacementInfo(_targetSlot);
                }
            }
            
            // Transition to PlacedInSlotState
            // The state will handle animation and finalization in OnEnterState
            ctx.StateMachine.ChangeState(CardStateNames.PlacedInSlot);
        }
        
        private void OnDisable()
        {
            if (_context?.RootTransform != null)
            {
                _context.RootTransform.localScale = _originalScale;
            }
        }
    }
}