using AppleHills.Data.CardSystem;
using Core;
using Data.CardSystem;
using UI.DragAndDrop.Core;
using UnityEngine;

namespace UI.CardSystem
{
    /// <summary>
    /// Specialized slot for album pages that only accepts a specific card.
    /// Empty by default, auto-spawns owned cards on enable.
    /// </summary>
    public class AlbumCardSlot : DraggableSlot
    {
        [Header("Album Slot Configuration")]
        [SerializeField] private CardDefinition targetCardDefinition; // Which card this slot accepts
        [SerializeField] private GameObject cardPrefab; // Card prefab to spawn when card is owned
        
        private StateMachine.Card _assignedCard; // The card currently in this slot (if any)
        
        /// <summary>
        /// Get the target card definition for this slot
        /// </summary>
        public CardDefinition TargetCardDefinition => targetCardDefinition;
        
        /// <summary>
        /// Check if this slot has a card assigned to it
        /// </summary>
        public bool HasCardAssigned => _assignedCard != null;
        
        /// <summary>
        /// Get the card currently assigned to this slot
        /// </summary>
        public StateMachine.Card AssignedCard => _assignedCard;
        
        private void OnEnable()
        {
            // Check if we should spawn a card for this slot
            CheckAndSpawnOwnedCard();
        }
        
        /// <summary>
        /// Assign a card to this slot (called by AlbumViewPage after placement animation)
        /// </summary>
        public void AssignCard(StateMachine.Card card)
        {
            if (card == null)
            {
                Logging.Warning("[AlbumCardSlot] Attempted to assign null card to slot");
                return;
            }
            
            if (_assignedCard != null && _assignedCard != card)
            {
                Logging.Warning($"[AlbumCardSlot] Slot already has a card assigned, replacing with new card");
                // Clean up old card
                if (_assignedCard.gameObject != null)
                {
                    Destroy(_assignedCard.gameObject);
                }
            }
            
            _assignedCard = card;
            Logging.Debug($"[AlbumCardSlot] Card '{card.CardData?.Name}' assigned to slot for {targetCardDefinition?.name}");
        }
        
        /// <summary>
        /// Check if player owns the card for this slot and spawn it if so
        /// (Called on OnEnable to handle game reload scenarios)
        /// </summary>
        private void CheckAndSpawnOwnedCard()
        {
            // Guard: need CardSystemManager and target definition
            if (CardSystemManager.Instance == null || targetCardDefinition == null)
                return;
            
            // Guard: don't spawn if already has a card assigned
            if (_assignedCard != null)
            {
                Logging.Debug($"[AlbumCardSlot] Slot for {targetCardDefinition.name} already has card assigned, skipping spawn");
                return;
            }
            
            // Guard: need prefab to spawn
            if (cardPrefab == null)
            {
                Logging.Warning($"[AlbumCardSlot] No cardPrefab assigned for slot targeting {targetCardDefinition.name}");
                return;
            }
            
            // Check if player owns this card in COLLECTION (not pending)
            CardData ownedCard = FindOwnedCardForSlot();
            
            // Only spawn if owned (not pending)
            if (ownedCard != null)
            {
                Logging.Debug($"[AlbumCardSlot] Found owned card for {targetCardDefinition.name}, spawning");
                SpawnOwnedCard(ownedCard);
            }
        }
        
        /// <summary>
        /// Find owned card for this slot (checks collection only, not pending)
        /// </summary>
        private CardData FindOwnedCardForSlot()
        {
            var inventory = CardSystemManager.Instance.GetCardInventory();
            
            // Check in order: Legendary > Rare > Normal (prioritize highest rarity)
            foreach (CardRarity rarity in new[] { CardRarity.Legendary, CardRarity.Rare, CardRarity.Normal })
            {
                CardData card = inventory.GetCard(targetCardDefinition.Id, rarity);
                if (card != null)
                {
                    return card; // Found highest rarity owned
                }
            }
            
            return null; // Not owned
        }
        
        /// <summary>
        /// Spawn a card that the player already owns (for reload scenarios)
        /// </summary>
        private void SpawnOwnedCard(CardData cardData)
        {
            GameObject cardObj = Instantiate(cardPrefab, transform);
            var card = cardObj.GetComponent<StateMachine.Card>();
            
            if (card != null)
            {
                // Setup card for album slot (starts in PlacedInSlotState)
                card.SetupForAlbumSlot(cardData, this);
                
                // Resize the card to match the slot size
                RectTransform cardRect = card.transform as RectTransform;
                RectTransform slotRect = transform as RectTransform;
                if (cardRect != null && slotRect != null)
                {
                    float targetHeight = slotRect.rect.height;
                    cardRect.sizeDelta = new Vector2(cardRect.sizeDelta.x, targetHeight);
                    cardRect.localPosition = Vector3.zero;
                    cardRect.localRotation = Quaternion.identity;
                }
                
                // Assign card to this slot
                _assignedCard = card;
                
                // Register with AlbumViewPage for enlarge/shrink handling
                AlbumViewPage albumPage = FindFirstObjectByType<AlbumViewPage>();
                if (albumPage != null)
                {
                    albumPage.RegisterCardInAlbum(card);
                }
                
                Logging.Debug($"[AlbumCardSlot] Spawned owned card '{cardData.Name}' ({cardData.Rarity}) in slot");
            }
            else
            {
                Logging.Warning($"[AlbumCardSlot] Spawned prefab has no Card component!");
                Destroy(cardObj);
            }
        }
    }
}