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;
        
        [Header("Navigation")]
        [SerializeField] private Button backButton;
        
        // 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>();
            
            // Set up back button
            if (backButton != null)
            {
                backButton.onClick.AddListener(OnBackButtonClicked);
            }
        }

        /// <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
                DisplayCards(collectedCards);
            }
        }

        /// <summary>
        /// Creates UI elements for the player's collected cards
        /// </summary>
        private void DisplayCards(List<CardData> cards)
        {
            if (albumGrid == null || cardPrefab == null) return;
            
            // Sort cards by collection index
            cards.Sort((a, b) => a.CollectionIndex.CompareTo(b.CollectionIndex));
            
            // Create card UI elements
            foreach (var cardData in cards)
            {
                GameObject cardObj = Instantiate(cardPrefab, albumGrid.transform);
                
                // Configure the card UI with the card data
                CardUIElement cardUI = cardObj.GetComponent<CardUIElement>();
                if (cardUI != null)
                {
                    cardUI.SetupCard(cardData);
                    _displayedCards.Add(cardUI);
                }
            }
        }

        /// <summary>
        /// Clears all card UI elements from the album
        /// </summary>
        private void ClearAlbum()
        {
            foreach (var card in _displayedCards)
            {
                if (card != null && card.gameObject != null)
                    Destroy(card.gameObject);
            }
            _displayedCards.Clear();
        }

        /// <summary>
        /// Initializes filter dropdowns
        /// </summary>
        private void InitializeFilters()
        {
            // Setup zone filter dropdown
            if (zoneFilterDropdown != null)
            {
                zoneFilterDropdown.ClearOptions();
                
                // Add "All Zones" option
                List<string> zoneOptions = new List<string>() { "All Zones" };
                
                // Add options for each zone
                foreach (CardZone zone in System.Enum.GetValues(typeof(CardZone)))
                {
                    zoneOptions.Add(zone.ToString());
                }
                
                zoneFilterDropdown.AddOptions(zoneOptions);
                zoneFilterDropdown.onValueChanged.AddListener(OnFilterChanged);
            }
            
            // Setup rarity filter dropdown
            if (rarityFilterDropdown != null)
            {
                rarityFilterDropdown.ClearOptions();
                
                // Add "All Rarities" option
                List<string> rarityOptions = new List<string>() { "All Rarities" };
                
                // Add options for each rarity
                foreach (CardRarity rarity in System.Enum.GetValues(typeof(CardRarity)))
                {
                    rarityOptions.Add(rarity.ToString());
                }
                
                rarityFilterDropdown.AddOptions(rarityOptions);
                rarityFilterDropdown.onValueChanged.AddListener(OnFilterChanged);
            }
            
            // Setup reset filters button
            if (resetFiltersButton != null)
            {
                resetFiltersButton.onClick.AddListener(OnResetFiltersClicked);
            }
        }
        
        /// <summary>
        /// Handles changes to the filter dropdowns
        /// </summary>
        private void OnFilterChanged(int value)
        {
            ApplyFilters();
        }
        
        /// <summary>
        /// Resets all filters to their default values
        /// </summary>
        private void OnResetFiltersClicked()
        {
            if (zoneFilterDropdown != null)
                zoneFilterDropdown.value = 0;
                
            if (rarityFilterDropdown != null)
                rarityFilterDropdown.value = 0;
                
            ApplyFilters();
        }
        
        /// <summary>
        /// Applies the current filter selections to the displayed cards
        /// </summary>
        private void ApplyFilters()
        {
            // Clear current cards
            ClearAlbum();
            
            // Get selected filters
            CardZone? selectedZone = null;
            CardRarity? selectedRarity = null;
            
            // Get zone filter value
            if (zoneFilterDropdown != null && zoneFilterDropdown.value > 0)
            {
                selectedZone = (CardZone)(zoneFilterDropdown.value - 1);
            }
            
            // Get rarity filter value
            if (rarityFilterDropdown != null && rarityFilterDropdown.value > 0)
            {
                selectedRarity = (CardRarity)(rarityFilterDropdown.value - 1);
            }
            
            // Get filtered cards
            List<CardData> filteredCards = GetFilteredCards(selectedZone, selectedRarity);
            
            // Create card UI elements for the filtered cards
            DisplayCards(filteredCards);
            
            Logging.Debug($"[AlbumViewPage] Applied filters. Showing {filteredCards.Count} cards.");
        }
        
        /// <summary>
        /// Gets cards filtered by zone and/or rarity
        /// </summary>
        private List<CardData> GetFilteredCards(CardZone? zone, CardRarity? rarity)
        {
            List<CardData> result;
            
            // Get all collected cards
            if (zone == null && rarity == null)
            {
                // No filters, return all cards
                result = _cardManager.GetAllCollectedCards();
            }
            else if (zone != null && rarity != null)
            {
                // Both filters, get cards by zone and rarity
                result = _cardManager.GetCardsByZoneAndRarity(zone.Value, rarity.Value);
            }
            else if (zone != null)
            {
                // Only zone filter
                result = _cardManager.GetCardsByZone(zone.Value);
            }
            else
            {
                // Only rarity filter
                result = _cardManager.GetCardsByRarity(rarity.Value);
            }
            
            return result;
        }
        
        /// <summary>
        /// Handles click on the back button
        /// </summary>
        private void OnBackButtonClicked()
        {
            // Use the UIPageController to go back to the previous page
            UIPageController pageController = UIPageController.Instance;
            if (pageController != null)
            {
                pageController.PopPage();
            }
        }
        
        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);
            }
            else
            {
                // Fallback if no CanvasGroup
                onComplete?.Invoke();
            }
        }
        
        protected override void DoTransitionOut(System.Action onComplete)
        {
            // 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);
            }
            else
            {
                // Fallback if no CanvasGroup
                onComplete?.Invoke();
            }
        }
        
        private void OnDestroy()
        {
            // Clean up button listeners
            if (backButton != null)
            {
                backButton.onClick.RemoveListener(OnBackButtonClicked);
            }
            
            if (zoneFilterDropdown != null)
            {
                zoneFilterDropdown.onValueChanged.RemoveListener(OnFilterChanged);
            }
            
            if (rarityFilterDropdown != null)
            {
                rarityFilterDropdown.onValueChanged.RemoveListener(OnFilterChanged);
            }
            
            if (resetFiltersButton != null)
            {
                resetFiltersButton.onClick.RemoveListener(OnResetFiltersClicked);
            }
        }
        
        private void OnEnable()
        {
            if (_cardManager == null)
            {
                _cardManager = CardSystemManager.Instance;
            }
        }
    }
}