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

namespace AppleHills.UI.CardSystem
{
    /// <summary>
    /// UI page for viewing the player's card collection in an album.
    /// </summary>
    public class AlbumViewPage : UIPage
    {
        [Header("Album UI Elements")]
        [SerializeField] private GridLayoutGroup albumGrid;
        [SerializeField] private GameObject cardPrefab;
        
        [Header("Filter UI")]
        [SerializeField] private TMP_Dropdown zoneFilterDropdown;
        [SerializeField] private TMP_Dropdown rarityFilterDropdown;
        [SerializeField] private Button resetFiltersButton;
        [SerializeField] private CanvasGroup canvasGroup;
        
        // Runtime references
        private CardSystemManager _cardManager;
        private List<CardUIElement> _displayedCards = new List<CardUIElement>();

        private void Awake()
        {
            _cardManager = CardSystemManager.Instance;
            
            // Make sure we have a CanvasGroup for transitions
            if (canvasGroup == null)
                canvasGroup = GetComponent<CanvasGroup>();
            if (canvasGroup == null)
                canvasGroup = gameObject.AddComponent<CanvasGroup>();
        }

        /// <summary>
        /// Sets up the album when the page becomes active
        /// </summary>
        public override void TransitionIn()
        {
            base.TransitionIn();
            
            // Initialize the album when the page becomes active
            InitializeAlbum();
        }

        /// <summary>
        /// Initializes the album with the player's collection
        /// </summary>
        private void InitializeAlbum()
        {
            // Clear any previous setup
            ClearAlbum();
            
            // Setup filter UI
            InitializeFilters();
            
            // Get all collected cards
            List<CardData> collectedCards = _cardManager.GetAllCollectedCards();
            
            // If there are cards to display, create UI elements for them
            if (collectedCards.Count > 0)
            {
                // Create card UI elements
                CreateCardStack(collectedCards);
            }
        }

        /// <summary>
        /// Creates UI elements for the player's collected cards
        /// </summary>
        private void CreateCardStack(List<CardData> cards)
        {
            if (albumGrid == null || cardPrefab == null) return;
            
            // Stack offset for visual effect
            Vector3 stackOffset = new Vector3(5f, -5f, 0f);
            Vector3 basePosition = Vector3.zero;
            
            // Sort cards by collection index
            cards.Sort((a, b) => a.CollectionIndex.CompareTo(b.CollectionIndex));
            
            // Create card UI elements
            for (int i = 0; i < cards.Count; i++)
            {
                GameObject cardObj = Instantiate(cardPrefab, albumGrid.transform);
                CardUIElement cardUI = cardObj.GetComponent<CardUIElement>();
                
                if (cardUI != null)
                {
                    // Position in stack
                    cardObj.GetComponent<RectTransform>().anchoredPosition = basePosition + (stackOffset * i);
                    
                    // Set up card data
                    cardUI.SetupCard(cards[i]);
                    
                    // Add drag handlers
                    SetupCardDragHandlers(cardUI);
                    
                    // Add to tracked cards
                    _displayedCards.Add(cardUI);
                }
            }
        }

        /// <summary>
        /// Sets up drag and drop handlers for a card
        /// </summary>
        private void SetupCardDragHandlers(CardUIElement cardUI)
        {
            // Add click listener to handle card clicks
            Button cardButton = cardUI.GetComponent<Button>();
            if (cardButton != null)
            {
                cardButton.onClick.AddListener(() => OnCardClicked(cardUI));
            }
            
            // Subscribe to the card's own click event
            cardUI.OnCardClicked += OnCardClicked;
        }
        
        /// <summary>
        /// Handles when a card is clicked (simplistic alternative to drag and drop)
        /// </summary>
        private void OnCardClicked(CardUIElement cardUI)
        {
            CardData cardData = cardUI.GetCardData();
            
            // Currently, clicking a card does not perform any action
            // This can be expanded to show card details or other interactions
        }
        
        /// <summary>
        /// Clears all cards from the album
        /// </summary>
        private void ClearAlbum()
        {
            // Clear card UI elements
            foreach (var card in _displayedCards)
            {
                if (card != null && card.gameObject != null)
                {
                    Destroy(card.gameObject);
                }
            }
            _displayedCards.Clear();
        }
        
        /// <summary>
        /// Initialize filtering UI and set up listeners
        /// </summary>
        private void InitializeFilters()
        {
            // Setup zone filter
            if (zoneFilterDropdown != null)
            {
                zoneFilterDropdown.ClearOptions();
                
                // Add "All Zones" option
                List<string> zoneOptions = new List<string> { "All Zones" };
                
                // Add each zone
                foreach (CardZone zone in System.Enum.GetValues(typeof(CardZone)))
                {
                    zoneOptions.Add(zone.ToString());
                }
                
                zoneFilterDropdown.AddOptions(zoneOptions);
                zoneFilterDropdown.onValueChanged.AddListener(OnZoneFilterChanged);
            }
            
            // Setup rarity filter
            if (rarityFilterDropdown != null)
            {
                rarityFilterDropdown.ClearOptions();
                
                // Add "All Rarities" option
                List<string> rarityOptions = new List<string> { "All Rarities" };
                
                // Add each rarity
                foreach (CardRarity rarity in System.Enum.GetValues(typeof(CardRarity)))
                {
                    rarityOptions.Add(rarity.ToString());
                }
                
                rarityFilterDropdown.AddOptions(rarityOptions);
                rarityFilterDropdown.onValueChanged.AddListener(OnRarityFilterChanged);
            }
            
            // Setup reset button
            if (resetFiltersButton != null)
            {
                resetFiltersButton.onClick.AddListener(ResetFilters);
            }
        }
        
        /// <summary>
        /// Called when zone filter dropdown changes
        /// </summary>
        private void OnZoneFilterChanged(int index)
        {
            ApplyFilters();
        }
        
        /// <summary>
        /// Called when rarity filter dropdown changes
        /// </summary>
        private void OnRarityFilterChanged(int index)
        {
            ApplyFilters();
        }
        
        /// <summary>
        /// Reset all filters to default values
        /// </summary>
        private void ResetFilters()
        {
            if (zoneFilterDropdown != null)
                zoneFilterDropdown.value = 0;
                
            if (rarityFilterDropdown != null)
                rarityFilterDropdown.value = 0;
                
            ApplyFilters();
        }
        
        /// <summary>
        /// Apply current filter settings to the displayed cards
        /// </summary>
        private void ApplyFilters()
        {
            if (_cardManager == null) return;
            
            // Get all cards
            List<CardData> allCards = _cardManager.GetAllCollectedCards();
            List<CardData> filteredCards = new List<CardData>(allCards);
            
            // Apply zone filter
            if (zoneFilterDropdown != null && zoneFilterDropdown.value > 0)
            {
                CardZone selectedZone = (CardZone)(zoneFilterDropdown.value - 1);
                filteredCards = filteredCards.FindAll(card => card.Zone == selectedZone);
            }
            
            // Apply rarity filter
            if (rarityFilterDropdown != null && rarityFilterDropdown.value > 0)
            {
                CardRarity selectedRarity = (CardRarity)(rarityFilterDropdown.value - 1);
                filteredCards = filteredCards.FindAll(card => card.Rarity == selectedRarity);
            }
            
            // Update the displayed cards
            ClearAlbum();
            CreateCardStack(filteredCards);
        }
        
        // Override for transition animations
        protected override void DoTransitionIn(System.Action onComplete)
        {
            // Reset the canvas group
            if (canvasGroup != null)
            {
                canvasGroup.alpha = 0f;
                Tween.Value(0f, 1f, (value) => canvasGroup.alpha = value, transitionDuration, 0f, Tween.EaseInOut, Tween.LoopType.None, null, onComplete);
            }
            else
            {
                // Simple scale animation if no canvas group
                transform.localScale = Vector3.zero;
                Tween.LocalScale(transform, Vector3.one, transitionDuration, 0f, Tween.EaseOutBack, Tween.LoopType.None, null, onComplete);
            }
        }
        
        protected override void DoTransitionOut(System.Action onComplete)
        {
            // Simple fade animation
            if (canvasGroup != null)
            {
                Tween.Value(canvasGroup.alpha, 0f, (value) => canvasGroup.alpha = value, transitionDuration, 0f, Tween.EaseInOut, Tween.LoopType.None, null, onComplete);
            }
            else
            {
                Tween.LocalScale(transform, Vector3.zero, transitionDuration, 0f, Tween.EaseInBack, Tween.LoopType.None, null, onComplete);
            }
        }
        
        private void OnDestroy()
        {
            // Clean up filter listeners
            if (zoneFilterDropdown != null)
                zoneFilterDropdown.onValueChanged.RemoveListener(OnZoneFilterChanged);
                
            if (rarityFilterDropdown != null)
                rarityFilterDropdown.onValueChanged.RemoveListener(OnRarityFilterChanged);
                
            if (resetFiltersButton != null)
                resetFiltersButton.onClick.RemoveListener(ResetFilters);
                
            // Clean up card listeners
            foreach (var card in _displayedCards)
            {
                if (card != null)
                {
                    // Unsubscribe from card events
                    card.OnCardClicked -= OnCardClicked;
                    
                    // Remove button listeners
                    Button cardButton = card.GetComponent<Button>();
                    if (cardButton != null)
                    {
                        cardButton.onClick.RemoveAllListeners();
                    }
                }
            }
        }
    }
}