# Card System Guide

Complete guide to the Apple Hills card collecting and album system.

## Table of Contents
- [Overview](#overview)
- [Quick Start](#quick-start)
- [System Architecture](#system-architecture)
- [Card Flows](#card-flows)
- [Key Components](#key-components)
- [Working with Cards in Code](#working-with-cards-in-code)
- [Extending the System](#extending-the-system)
- [Troubleshooting](#troubleshooting)

---

## Overview

The Card System manages the player's collectible card journey from booster pack opening to album placement. It consists of:

- **Booster Opening Flow**: Interactive pack opening with card reveals
- **Album Placement Flow**: Drag-and-drop cards into album slots
- **State Machine**: Each card progresses through well-defined states
- **Album Navigation**: Book-based album with zone tabs
- **Notification System**: Visual feedback for new boosters/pending cards

### Core Concepts

**CardData**: Runtime data for a single card (definition ID, rarity, zone, image)
**CardDefinition**: ScriptableObject template defining card properties
**Card States**: Cards transition through states (Idle → Revealed → Dragging → Placed)
**Pending Cards**: Cards waiting to be placed in the album (shown in bottom-right corner)

---

## Quick Start

### Opening the Album

```csharp
// From any script
if (UIPageController.Instance != null)
{
    UIPageController.Instance.PushPage(albumViewPage);
}
```

### Granting Booster Packs

```csharp
// Simple API
CardSystemManager.Instance.AddBoosterPack(1);

// Visual grant with animation (from minigames)
MinigameBoosterGiver.Instance.GiveBooster(() => {
    Debug.Log("Booster granted and animation complete!");
});
```

### Opening a Booster Pack (Programmatic)

```csharp
// Returns list of cards in the pack
List<CardData> cards = CardSystemManager.Instance.OpenBoosterPack();

// The cards are automatically added to "pending" state
// Player must place them in album manually
```

### Checking Player's Collection

```csharp
var inventory = CardSystemManager.Instance.GetCardInventory();

// Check if player owns a specific card
CardData ownedCard = inventory.GetCard("CardDefID", CardRarity.Legendary);

// Get all cards in a zone
List<CardData> townCards = inventory.GetCardsByZone(CardZone.Town);

// Check completion percentage
float completion = inventory.GetCompletionPercentage();
```

---

## System Architecture

### Component Hierarchy

```
CardSystemManager (Singleton)
├── Inventory Management
├── Booster Pack Logic
└── Pending Card Queue

AlbumViewPage (UI Page)
├── CornerCardManager (Non-Component)
│   └── Manages 3 pending cards in corner
├── AlbumNavigationService (Non-Component)
│   └── Book page flipping & zone navigation
└── CardEnlargeController (Non-Component)
    └── Backdrop & enlarge/shrink animations

BoosterOpeningPage (UI Page)
└── Manages pack opening flow & card reveals

Card (MonoBehaviour)
├── CardContext (shared state)
├── CardAnimator (animations)
├── CardDisplay (visuals)
└── StateMachine (10 possible states)
```

### Non-Component Controllers

The system uses **Controller** pattern for complex logic without Unity lifecycle overhead:

- **CornerCardManager**: Spawns/despawns pending cards, smart selection, shuffle logic
- **AlbumNavigationService**: Book page navigation, zone mapping
- **CardEnlargeController**: Backdrop visibility, card reparenting for enlarge view
- **ProgressBarController**: Booster opening progress visualization

These are instantiated lazily via C# properties:
```csharp
private CornerCardManager _cornerCardManager;
private CornerCardManager CornerCards => _cornerCardManager ??= new CornerCardManager(...);
```

---

## Card Flows

### 1. Booster Opening Flow

```
Player opens booster pack
  ↓
BoosterOpeningPage spawns cards face-down
  ↓
Player clicks a card (IdleState → EnlargedNewState/EnlargedRepeatState)
  ↓
Card flips & enlarges, shows NEW or REPEAT badge
  ↓
Player clicks to dismiss (→ RevealedState)
  ↓
Repeat until all cards revealed
  ↓
Cards fly to album icon, added to pending queue
  ↓
Page auto-closes (or waits for player)
```

**Key States:**
- **IdleState**: Face-down, awaiting click
- **EnlargedNewState**: NEW badge (first time collection)
- **EnlargedRepeatState**: REPEAT badge (duplicate)
- **EnlargedLegendaryRepeatState**: Special legendary repeat state
- **RevealedState**: Face-up, dismissed from center

### 2. Album Placement Flow

```
AlbumViewPage opens
  ↓
CornerCardManager spawns up to 3 pending cards (face-down)
  ↓
Player drags card (PendingFaceDownState → DraggingRevealedState)
  ↓
Card data assigned, flips to reveal, book navigates to correct zone page
  ↓
Player drops card on matching AlbumCardSlot
  ↓
Card placed (→ PlacedInSlotState), registered with AlbumViewPage
  ↓
CornerCardManager rebuilds: shuffles remaining cards, spawns new if available
```

**Key States:**
- **PendingFaceDownState**: Face-down in corner, no data assigned yet
- **DraggingRevealedState**: Data assigned, flipped, dragging to slot
- **PlacedInSlotState**: Locked in album slot
- **AlbumEnlargedState**: Clicked from slot, enlarged for viewing

### 3. Album Card Viewing

```
Player clicks placed card in album slot
  ↓
Card enlarges (PlacedInSlotState → AlbumEnlargedState)
  ↓
Backdrop shown, card reparented to enlarged container
  ↓
Card animates to center with dramatic scale increase
  ↓
Player clicks card or backdrop to dismiss
  ↓
Card shrinks & animates back to slot (→ PlacedInSlotState)
  ↓
Backdrop hidden, card reparented back to slot
```

---

## Key Components

### CardSystemManager

**Singleton** managing all card data and inventory.

```csharp
// Access
CardSystemManager.Instance

// Key Methods
.AddBoosterPack(int count)           // Grant booster packs
.OpenBoosterPack()                   // Open a pack, returns CardData[]
.GetPendingRevealCards()             // Get cards waiting for album placement
.GetCardInventory()                  // Access player's collection
.AddCardToInventory(CardData)        // Add card to collection
.RemoveFromPending(CardData)         // Remove from pending queue

// Events
.OnBoosterCountChanged(int newCount)
.OnPendingCardAdded(CardData)
.OnPendingCardRemoved(CardData)
```

### AlbumViewPage

**UI Page** for viewing and managing the album.

```csharp
// Setup in scene:
// - Assign book reference (BookPro component)
// - Assign zone tab container
// - Assign card prefab for spawning
// - Assign backdrop & enlarged container for card viewing
// - Link to BoosterOpeningPage

// Query Methods (used by Card states)
public CardData GetCardForPendingSlot()           // Smart card selection
public AlbumCardSlot GetTargetSlotForCard(CardData) // Find destination slot
public void NavigateToCardPage(CardData, Action)   // Flip to correct page
public void NotifyCardPlaced(Card)                 // Cleanup after placement

// Public Properties
public bool IsPageFlipping                         // For state timing checks
```

### BoosterOpeningPage

**UI Page** for opening booster packs.

```csharp
// Setup in scene:
// - Assign booster pack prefab
// - Assign corner slots for waiting boosters (max 3)
// - Assign center slot for opening
// - Assign card display container
// - Assign card prefab
// - Assign album icon (dismiss button & tween target)

// Call before showing:
.SetAvailableBoosterCount(int count)  // How many boosters player has

// Flow automatically managed by page
```

### Card States

Each card uses **AppleMachine** state machine with these states:

| State | Purpose | Entry Trigger |
|-------|---------|---------------|
| **IdleState** | Face-down in booster opening | Card spawned for booster reveal |
| **EnlargedNewState** | Enlarged with NEW badge | Clicked first-time card |
| **EnlargedRepeatState** | Enlarged with REPEAT badge | Clicked duplicate |
| **EnlargedLegendaryRepeatState** | Legendary repeat variant | Clicked legendary duplicate |
| **RevealedState** | Face-up, dismissed | Dismissed from enlarged state |
| **PendingFaceDownState** | Face-down in corner | Spawned in album corner |
| **DraggingRevealedState** | Face-up while dragging | Dragged from corner |
| **PlacedInSlotState** | Locked in album slot | Dropped on correct slot |
| **AlbumEnlargedState** | Enlarged from album | Clicked while in slot |
| **DraggingState** | Generic drag state | *(unused in current flow)* |

### Card Context & Components

Every card has:
- **CardContext**: Shared state, component references, events
- **CardAnimator**: Centralized animation methods
- **CardDisplay**: Visual rendering (image, frame, overlay, rarity/zone styling)
- **AppleMachine**: State machine controller

```csharp
// Accessing card components
var card = GetComponent<Card>();
card.Context.CardData           // CardData
card.Context.Animator           // CardAnimator
card.Context.CardDisplay        // CardDisplay
card.Context.StateMachine       // AppleMachine
card.Context.AlbumViewPage      // Injected page reference
```

---

## Working with Cards in Code

### Spawning a Card for Booster Opening

```csharp
GameObject cardObj = Instantiate(cardPrefab, containerTransform);
var card = cardObj.GetComponent<Card>();
var context = cardObj.GetComponent<CardContext>();

// Setup card data
context.SetupCard(cardData);

// Start in IdleState for booster reveal
card.SetupForBoosterReveal(cardData, isNew);  // isNew unused, states query inventory

// Subscribe to reveal complete event
context.BoosterContext.OnRevealFlowComplete += () => {
    Debug.Log("Card reveal finished!");
};
```

### Spawning a Card for Album Corner

```csharp
GameObject cardObj = Instantiate(cardPrefab, slotTransform);
var card = cardObj.GetComponent<Card>();

// Assign to slot FIRST
card.AssignToSlot(slot, animateMove: false);

// Inject AlbumViewPage dependency
card.Context.SetAlbumViewPage(albumViewPage);

// Setup for pending state (no data yet)
card.SetupForAlbumPending();  // Starts in PendingFaceDownState
```

### Spawning a Card Already in Album Slot

```csharp
GameObject cardObj = Instantiate(cardPrefab, slotTransform);
var card = cardObj.GetComponent<Card>();

// Setup for album slot (already owned)
card.SetupForAlbumSlot(cardData, albumCardSlot);  // Starts in PlacedInSlotState

// Register for enlarge/shrink functionality
albumViewPage.RegisterCardInAlbum(card);
```

### Transitioning Card States Manually

```csharp
// Get card component
var card = GetComponent<Card>();

// Change state
card.ChangeState(CardStateNames.Revealed);

// Check current state
string currentState = card.GetCurrentStateName();
if (currentState == CardStateNames.PlacedInSlot)
{
    Debug.Log("Card is placed in album!");
}

// Get specific state component
var enlargedState = card.GetStateComponent<CardAlbumEnlargedState>(
    CardStateNames.AlbumEnlarged
);
if (enlargedState != null)
{
    // Access state-specific methods/properties
}
```

### Subscribing to Card Events

```csharp
var context = card.Context;

// Drag events
context.OnDragStarted += (ctx) => Debug.Log("Drag started!");
context.OnDragEnded += (ctx) => Debug.Log("Drag ended!");

// Click events (routed through CardDisplay)
context.CardDisplay.OnCardClicked += (display) => Debug.Log("Card clicked!");

// Booster reveal events
context.BoosterContext.OnRevealFlowComplete += () => {
    Debug.Log("Reveal complete!");
    CardSystemManager.Instance.AddCardToInventory(context.CardData);
};

// State machine events (if needed)
context.StateMachine.OnStateChange += (newState) => Debug.Log($"State: {newState.name}");
```

### Custom Animations

```csharp
var animator = card.Animator;

// Built-in animations
animator.PopIn(duration: 0.5f, onComplete: () => Debug.Log("Popped in!"));
animator.PopOut(duration: 0.3f);
animator.PlayEnlarge(targetScale: 2.5f);
animator.PlayShrink(targetScale: Vector3.one);

// Combine animations
animator.AnimateLocalPosition(Vector3.zero, duration: 0.5f);
animator.AnimateScale(Vector3.one * 1.5f, duration: 0.3f);

// Flip animation
Transform cardBack = card.transform.Find("CardBack");
Transform cardFront = card.transform.Find("CardDisplay");
animator.PlayFlip(cardBack, cardFront, duration: 0.6f, onComplete: () => {
    Debug.Log("Flip complete!");
});
animator.PlayFlipScalePunch(punchScale: 1.1f);

// Hover effects
Vector2 originalPos = animator.GetAnchoredPosition();
animator.HoverEnter(liftAmount: 20f, scaleMultiplier: 1.05f);
// ... later
animator.HoverExit(originalPos);
```

---

## Extending the System

### Adding a New Card State

1. **Create State Script** in `StateMachine/States/`
   ```csharp
   using Core.SaveLoad;
   using UI.CardSystem.StateMachine;

   public class MyNewCardState : AppleState, ICardClickHandler
   {
       private CardContext _context;
       
       public override void EnterState()
       {
           _context = GetComponentInParent<CardContext>();
           // Setup animations, visuals, etc.
       }
       
       public void OnCardClicked(CardContext context)
       {
           // Handle click behavior
       }
       
       public override void ExitState()
       {
           // Cleanup
       }
   }
   ```

2. **Add State Name** to `CardStateNames.cs`
   ```csharp
   public const string MyNewState = "MyNewCardState";
   ```

3. **Add GameObject** as child of Card prefab's AppleMachine with your state component attached

4. **Transition to State**
   ```csharp
   card.ChangeState(CardStateNames.MyNewState);
   ```

### Creating a Custom Card Visual Effect

```csharp
public class MyCardEffect : MonoBehaviour
{
    private CardContext _context;
    
    void Start()
    {
        _context = GetComponentInParent<CardContext>();
        
        // Subscribe to state changes
        _context.StateMachine.OnStateChange += OnStateChanged;
    }
    
    void OnStateChanged(AppleState newState)
    {
        if (newState.name == CardStateNames.EnlargedNew)
        {
            // Play custom effect
            PlaySparkleEffect();
        }
    }
    
    void PlaySparkleEffect()
    {
        // Your custom effect logic
    }
}
```

### Adding Custom Card Slots

```csharp
public class MyCustomCardSlot : AlbumCardSlot
{
    protected override void OnCardPlaced(Card card)
    {
        base.OnCardPlaced(card);
        
        // Custom logic when card placed
        PlaySpecialEffect();
    }
}
```

---

## Troubleshooting

### Cards Not Showing in Corner

**Check:**
1. AlbumViewPage has `cardPrefab` assigned
2. AlbumViewPage has `bottomRightSlots` assigned (SlotContainer with 3 slots)
3. CardSystemManager has pending cards: `GetPendingRevealCards().Count > 0`
4. Page is in album proper (not menu page): Check with `IsInAlbumProper()`

**Debug:**
```csharp
Debug.Log($"Pending cards: {CardSystemManager.Instance.GetPendingRevealCards().Count}");
Debug.Log($"Is in album: {albumViewPage.IsInAlbumProper()}");
```

### Cards Spawning on Top of Each Other

**Cause:** Corner slots not properly configured with `SlotIndex` property

**Fix:**
- Ensure each slot has unique `SlotIndex` (0, 1, 2)
- Verify in inspector: Select each slot → Check `SlotIndex` field

### Card Won't Flip

**Check:**
1. Card has `CardBack` child GameObject
2. Card has `CardDisplay` child GameObject  
3. Both have proper hierarchy: `Card → CardBack`, `Card → CardDisplay`
4. State transitions are correct

**Debug:**
```csharp
var cardBack = card.transform.Find("CardBack");
var cardDisplay = card.transform.Find("CardDisplay");
Debug.Log($"Back found: {cardBack != null}, Display found: {cardDisplay != null}");
Debug.Log($"Current state: {card.GetCurrentStateName()}");
```

### Book Won't Flip to Correct Page

**Check:**
1. BookTabButton components configured with correct `zone` and `targetPage`
2. AlbumViewPage has `tabContainer` assigned
3. BookPro component reference assigned on AlbumViewPage

**Debug:**
```csharp
// In AlbumViewPage
foreach (var tab in _zoneTabs)
{
    Debug.Log($"Tab: {tab.Zone} → Page {tab.TargetPage}");
}
```

### Cards Not Enlarging When Clicked in Album

**Check:**
1. Card is in `PlacedInSlotState`
2. AlbumViewPage has `cardEnlargedBackdrop` and `cardEnlargedContainer` assigned
3. Card was registered: `albumViewPage.RegisterCardInAlbum(card)`

**Debug:**
```csharp
var enlargedState = card.GetStateComponent<CardAlbumEnlargedState>(CardStateNames.AlbumEnlarged);
Debug.Log($"Enlarged state found: {enlargedState != null}");
Debug.Log($"Current state: {card.GetCurrentStateName()}");
```

### Memory Leaks / Cards Not Destroying

**Cause:** Event subscriptions not cleaned up

**Fix Pattern:**
```csharp
void OnEnable()
{
    card.Context.OnDragStarted += HandleDrag;
}

void OnDisable()
{
    if (card != null && card.Context != null)
    {
        card.Context.OnDragStarted -= HandleDrag;
    }
}
```

### Booster Packs Not Appearing

**Check:**
1. BoosterOpeningPage has `boosterPackPrefab` assigned
2. BoosterOpeningPage has `bottomRightSlots` assigned
3. Called `SetAvailableBoosterCount()` before showing page

**Debug:**
```csharp
Debug.Log($"Booster count: {CardSystemManager.Instance.GetBoosterPackCount()}");
Debug.Log($"Booster prefab: {boosterOpeningPage.boosterPackPrefab != null}");
```

---

## State Diagram

```
BOOSTER OPENING FLOW:
IdleState ──click──> EnlargedNewState ──click──> RevealedState
                 └──> EnlargedRepeatState ──┘
                 └──> EnlargedLegendaryRepeatState ──┘

ALBUM PLACEMENT FLOW:
PendingFaceDownState ──drag──> DraggingRevealedState ──drop on slot──> PlacedInSlotState
                                                                              │
                                                                           click
                                                                              │
                                                                              ↓
                                                                      AlbumEnlargedState
                                                                              │
                                                                           click
                                                                              │
                                                                              ↓
                                                                      PlacedInSlotState
```

---

## Additional Resources

- **Code Location**: `Assets/Scripts/UI/CardSystem/`
- **Card Prefabs**: `Assets/Prefabs/UI/Cards/`
- **Card Definitions**: `Assets/Data/CardSystem/Definitions/`
- **Album Scene**: `Assets/Scenes/Album.unity`

**Related Systems:**
- [UIPageController Documentation](ui_page_navigation.md) - UI page stack navigation
- [DragAndDrop System](../Scripts/UI/DragAndDrop/Core/) - Base drag/drop framework
- [Settings System](settings_readme.md) - Card system configuration

---

**Last Updated:** November 18, 2025  
**Version:** 1.0  
**Contributors:** Development Team