AppleHillsProduction/Assets/Scripts/UI/CardSystem/AlbumViewPage.cs

using Pixelplacement;
using UI.Core;
using UnityEngine;
using UnityEngine.UI;

namespace UI.CardSystem
{
    /// <summary>
    /// UI page for viewing the player's card collection in an album.
    /// </summary>
    public class AlbumViewPage : UIPage
    {
        [SerializeField] private CanvasGroup canvasGroup;
        [SerializeField] private Button exitButton;
        [SerializeField] private BookCurlPro.BookPro book;

        private void Awake()
        {
            // Make sure we have a CanvasGroup for transitions
            if (canvasGroup == null)
                canvasGroup = GetComponent<CanvasGroup>();
            if (canvasGroup == null)
                canvasGroup = gameObject.AddComponent<CanvasGroup>();
            
            // Set up exit button
            if (exitButton != null)
            {
                exitButton.onClick.AddListener(OnExitButtonClicked);
            }
            
            // UI pages should start disabled
            gameObject.SetActive(false);
        }

        private void OnDestroy()
        {
            if (exitButton != null)
            {
                exitButton.onClick.RemoveListener(OnExitButtonClicked);
            }
        }

        private void OnExitButtonClicked()
        {
            if (book != null && book.CurrentPaper != 1)
            {
                // Not on page 0, flip to page 0 first
                BookCurlPro.AutoFlip autoFlip = book.GetComponent<BookCurlPro.AutoFlip>();
                if (autoFlip == null)
                {
                    autoFlip = book.gameObject.AddComponent<BookCurlPro.AutoFlip>();
                }
                
                autoFlip.enabled = true;
                autoFlip.StartFlipping(1);
            }
            else
            {
                // Already on page 0 or no book reference, exit
                if (UIPageController.Instance != null)
                {
                    UIPageController.Instance.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, obeyTimescale: false);
            }
            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, obeyTimescale: false);
            }
            else
            {
                // Fallback if no CanvasGroup
                onComplete?.Invoke();
            }
        }
    }
}