using System.Collections.Generic;
using AppleHills.Data.CardSystem;
using Core;
using UnityEngine;

namespace UI.CardSystem
{
    /// <summary>
    /// Manages album page navigation, zone mapping, and page flip tracking.
    /// Created and owned by AlbumViewPage (not a Unity component).
    /// </summary>
    public class AlbumNavigationService
    {
        private readonly BookCurlPro.BookPro _book;
        private readonly BookTabButton[] _zoneTabs;
        
        private bool _isPageFlipping = false;
        
        /// <summary>
        /// Is the book currently flipping to a page?
        /// </summary>
        public bool IsPageFlipping => _isPageFlipping;
        
        /// <summary>
        /// Constructor - called by AlbumViewPage's lazy property
        /// </summary>
        public AlbumNavigationService(BookCurlPro.BookPro book, BookTabButton[] zoneTabs)
        {
            _book = book;
            _zoneTabs = zoneTabs;
        }
        
        /// <summary>
        /// Check if we're currently viewing the album proper (not the menu page)
        /// </summary>
        public bool IsInAlbumProper()
        {
            if (_book == null)
            {
                Logging.Warning("[AlbumNavigationService] Book reference is null");
                return false;
            }
            
            // Page 1 is the menu/cover, page 2+ are album pages with card slots
            return _book.CurrentPaper > 1;
        }
        
        /// <summary>
        /// Navigate to the page where a specific card belongs
        /// </summary>
        public void NavigateToCardPage(CardData cardData, System.Action onComplete)
        {
            if (cardData == null || _book == null)
            {
                onComplete?.Invoke();
                return;
            }
            
            // Find target page based on card's zone
            int targetPage = FindPageForZone(cardData.Zone);
            
            if (targetPage < 0)
            {
                Logging.Warning($"[AlbumNavigationService] No page found for zone {cardData.Zone}");
                onComplete?.Invoke();
                return;
            }
            
            // Mark as flipping
            _isPageFlipping = true;
            Logging.Debug($"[AlbumNavigationService] Starting page flip to page {targetPage}");
            
            // Get or add AutoFlip component
            BookCurlPro.AutoFlip autoFlip = _book.GetComponent<BookCurlPro.AutoFlip>();
            if (autoFlip == null)
            {
                autoFlip = _book.gameObject.AddComponent<BookCurlPro.AutoFlip>();
            }
            
            // Start flipping with callback
            autoFlip.enabled = true;
            autoFlip.StartFlipping(targetPage, () => 
            {
                // Mark as complete
                _isPageFlipping = false;
                Logging.Debug($"[AlbumNavigationService] Page flip to {targetPage} completed");
                
                // Call original callback if provided
                onComplete?.Invoke();
            });
        }
        
        /// <summary>
        /// Get list of card definition IDs on the current page
        /// </summary>
        public List<string> GetDefinitionsOnCurrentPage()
        {
            var result = new List<string>();
            if (_book == null) return result;
            
            int currentPage = _book.CurrentPaper;
            
            // Find all AlbumCardSlot in scene
            var allSlots = Object.FindObjectsByType<AlbumCardSlot>(FindObjectsSortMode.None);
            
            foreach (var slot in allSlots)
            {
                if (IsSlotOnPage(slot.transform, currentPage))
                {
                    if (slot.TargetCardDefinition != null && !string.IsNullOrEmpty(slot.TargetCardDefinition.Id))
                    {
                        result.Add(slot.TargetCardDefinition.Id);
                    }
                }
            }
            
            return result;
        }
        
        #region Private Helpers
        
        /// <summary>
        /// Find the target page for a card zone using BookTabButtons
        /// </summary>
        private int FindPageForZone(CardZone zone)
        {
            if (_zoneTabs == null || _zoneTabs.Length == 0)
            {
                Logging.Warning("[AlbumNavigationService] No zone tabs available!");
                return -1;
            }
            
            foreach (var tab in _zoneTabs)
            {
                if (tab.Zone == zone)
                {
                    return tab.TargetPage;
                }
            }
            
            Logging.Warning($"[AlbumNavigationService] No BookTabButton found for zone {zone}");
            return -1;
        }
        
        /// <summary>
        /// Check if a slot's transform is on a specific book page
        /// </summary>
        private bool IsSlotOnPage(Transform slotTransform, int pageIndex)
        {
            if (_book == null || _book.papers == null || pageIndex < 0 || pageIndex >= _book.papers.Length)
                return false;
            
            var paper = _book.papers[pageIndex];
            if (paper == null) return false;
            
            // Check if slotTransform parent hierarchy contains paper.Front or paper.Back
            Transform current = slotTransform;
            while (current != null)
            {
                if ((paper.Front != null && current.gameObject == paper.Front) || 
                    (paper.Back != null && current.gameObject == paper.Back))
                    return true;
                current = current.parent;
            }
            
            return false;
        }
        
        #endregion
    }
}