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

namespace AppleHills.UI.CardSystem
{
    /// <summary>
    /// Main UI controller for the card album system.
    /// Manages the backpack icon and navigation between card system pages.
    /// </summary>
    public class CardAlbumUI : MonoBehaviour
    {
        [Header("UI References")]
        [SerializeField] private GameObject backpackIcon;
        [SerializeField] private UIPage mainMenuPage;
        [SerializeField] private UIPage albumViewPage;
        [SerializeField] private UIPage boosterOpeningPage;
        
        [Header("UI Elements")]
        [SerializeField] private Button backpackButton;
        [SerializeField] private Text boosterCountText;
        
        private UIPageController _pageController;
        private CardSystemManager _cardManager;
        private bool _isInitialized = false;
        
        private void Awake()
        {
            // Get or create a UI page controller
            _pageController = FindAnyObjectByType<UIPageController>();
            if (_pageController == null)
            {
                GameObject controllerObj = new GameObject("UIPageController");
                controllerObj.transform.SetParent(transform);
                _pageController = controllerObj.AddComponent<UIPageController>();
            }
            
            // Initialize pages and hide them
            InitializePages();
            
            // Set up backpack button
            if (backpackButton != null)
            {
                backpackButton.onClick.AddListener(OnBackpackButtonClicked);
            }
            
            // Initially show only the backpack icon
            ShowOnlyBackpackIcon();
        }

        private void Start()
        {
            // Get card manager
            _cardManager = CardSystemManager.Instance;
            
            // Subscribe to events
            if (_cardManager != null)
            {
                _cardManager.OnBoosterCountChanged += UpdateBoosterCount;
                UpdateBoosterCount(_cardManager.GetBoosterPackCount());
            }
            
            _isInitialized = true;
        }
        
        private void OnDestroy()
        {
            // Unsubscribe from events
            if (_cardManager != null)
            {
                _cardManager.OnBoosterCountChanged -= UpdateBoosterCount;
            }
            
            // Clean up button listeners
            if (backpackButton != null)
            {
                backpackButton.onClick.RemoveListener(OnBackpackButtonClicked);
            }
        }

        /// <summary>
        /// Initializes all UI pages and sets them up with proper callbacks
        /// </summary>
        private void InitializePages()
        {
            // Ensure all pages are inactive at start
            if (mainMenuPage != null) 
            {
                mainMenuPage.gameObject.SetActive(false);
            }
            
            if (albumViewPage != null) 
            {
                albumViewPage.gameObject.SetActive(false);
            }
            
            if (boosterOpeningPage != null) 
            {
                boosterOpeningPage.gameObject.SetActive(false);
            }
            
            // Set up page changed callback
            if (_pageController != null)
            {
                _pageController.OnPageChanged += OnPageChanged;
            }
        }

        /// <summary>
        /// Handles click on the backpack icon
        /// </summary>
        private void OnBackpackButtonClicked()
        {
            // If no pages are open, push the main menu
            if (_pageController.CurrentPage == null)
            {
                _pageController.PushPage(mainMenuPage);
            }
            else if (_pageController.CurrentPage == mainMenuPage)
            {
                // If main menu is open, pop it
                _pageController.PopPage();
            }
        }
        
        /// <summary>
        /// Handles changes to the current page
        /// </summary>
        private void OnPageChanged(UIPage newPage)
        {
            // Hide/show backpack icon based on current page
            if (newPage == null)
            {
                ShowOnlyBackpackIcon();
            }
            else
            {
                backpackIcon.SetActive(false);
            }
        }

        /// <summary>
        /// Shows only the backpack icon, hiding all other UI elements
        /// </summary>
        private void ShowOnlyBackpackIcon()
        {
            backpackIcon.SetActive(true);
        }

        /// <summary>
        /// Opens the album view page
        /// </summary>
        public void OpenAlbumView()
        {
            _pageController.PushPage(albumViewPage);
        }

        /// <summary>
        /// Opens the booster opening page if boosters are available
        /// </summary>
        public void OpenBoosterPack()
        {
            if (_cardManager != null && _cardManager.GetBoosterPackCount() > 0)
            {
                _pageController.PushPage(boosterOpeningPage);
            }
            else
            {
                Logging.Debug("[CardAlbumUI] No booster packs available");
                // TODO: Show "no boosters available" message
            }
        }
        
        /// <summary>
        /// Updates the booster count display
        /// </summary>
        private void UpdateBoosterCount(int count)
        {
            if (boosterCountText != null)
            {
                boosterCountText.text = count.ToString();
            }
        }
    }
}