Almost working card state machine
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Michal Pikulski
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docs/album_slot_migration_complete.md
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docs/album_slot_migration_complete.md
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# Album Slot Migration - Complete ✅
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## Migration Date
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November 16, 2025
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---
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## Summary
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Successfully migrated album card states from direct `IPointerClickHandler` to centralized click routing via `ICardClickHandler`, ensuring consistency with booster opening flow.
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---
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## Changes Made
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### 1. CardPlacedInSlotState.cs
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**Changed:**
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- ✅ Removed `IPointerClickHandler` interface
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- ✅ Removed `UnityEngine.EventSystems` using directive
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- ✅ Added `ICardClickHandler` interface
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- ✅ Renamed `OnPointerClick(PointerEventData)` → `OnCardClicked(CardContext)`
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- ✅ Updated method signature to use context parameter
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**Result:**
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- State now uses centralized click routing from CardContext
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- Consistent with booster opening states
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- Click gating via `context.IsClickable` now works
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---
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### 2. CardAlbumEnlargedState.cs
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**Changed:**
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- ✅ Removed `IPointerClickHandler` interface
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- ✅ Removed `UnityEngine.EventSystems` using directive
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- ✅ Added `ICardClickHandler` interface
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- ✅ Renamed `OnPointerClick(PointerEventData)` → `OnCardClicked(CardContext)`
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- ✅ Updated method signature to use context parameter
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- ✅ Added fallback for when animator is null (transitions to PlacedInSlotState immediately)
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**Result:**
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- State now uses centralized click routing from CardContext
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- Consistent with booster opening states
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- More robust error handling
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---
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### 3. AlbumCardSlot.cs
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**Changed:**
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- ✅ Added `AlbumViewPage.RegisterCardInAlbum(card)` call in `SpawnCard()` method
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- ✅ Finds AlbumViewPage via `FindFirstObjectByType<AlbumViewPage>()`
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- ✅ Subscribes card's AlbumEnlargedState events to page backdrop/reparenting handlers
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**Result:**
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- Cards spawned in slots now properly register with page
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- Backdrop shows when card is enlarged
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- Card reparents to enlarged container correctly
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---
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## Slot Behavior Verification
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### ✅ Slot Keeps Reference to Assigned Card
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```csharp
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private StateMachine.Card _placedCard;
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```
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- Reference stored when card is spawned or placed
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- Accessible via `GetPlacedCard()`
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### ✅ Auto-Spawn Owned Cards
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**Flow:**
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1. `OnEnable()` → `CheckAndSpawnOwnedCard()`
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2. Queries CardSystemManager for owned card (highest rarity)
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3. If owned → `SpawnCard(cardData)`
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4. Card spawned with `card.SetupForAlbumSlot(cardData, this)` → starts in `PlacedInSlotState`
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5. Card sized to match slot dimensions
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6. Card registered with AlbumViewPage
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### ✅ In Slot → Clickable → Enlarge
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**Flow:**
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1. Card in `PlacedInSlotState`
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2. User clicks → CardContext routes click to state via `ICardClickHandler`
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3. `PlacedInSlotState.OnCardClicked()` → transitions to `AlbumEnlargedState`
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4. AlbumEnlargedState fires `OnEnlargeRequested` event
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5. AlbumViewPage shows backdrop, reparents card to top layer
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6. Card animates to enlarged scale
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### ✅ Enlarged → Clickable → Dismiss
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**Flow:**
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1. Card in `AlbumEnlargedState`
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2. User clicks → CardContext routes click to state via `ICardClickHandler`
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3. `AlbumEnlargedState.OnCardClicked()` fires `OnShrinkRequested` event
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4. AlbumViewPage hides backdrop
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5. Card shrinks with animation
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6. On complete → transitions back to `PlacedInSlotState`
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7. Card reparents back to slot
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### ✅ No Card = No Preview
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**Current Behavior:**
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- If player doesn't own card, `ownedCard` remains null
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- `SpawnCard()` never called
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- Slot remains empty
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- No visuals shown
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**Future:** Slot itself clickable for silhouette preview (to be implemented)
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---
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## Architecture Benefits
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### Unified Click Routing
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**Before:**
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- Booster states: `ICardClickHandler` (centralized)
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- Album states: `IPointerClickHandler` (direct)
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- **Problem:** Two different click systems, confusing
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**After:**
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- All states: `ICardClickHandler` (centralized)
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- Single source of truth for click handling
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- Consistent gating via `context.IsClickable`
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### Click Flow
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```
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User clicks card →
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CardDisplay.OnPointerClick →
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CardContext.HandleCardDisplayClicked (checks IsClickable) →
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Finds current state's ICardClickHandler →
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State.OnCardClicked(context) →
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State logic executes
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```
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### Benefits
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- ✅ Consistent across all card states
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- ✅ Centralized gating (IsClickable)
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- ✅ Easy to debug (one routing path)
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- ✅ Easy to extend (add state, implement ICardClickHandler)
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- ✅ No more `IPointerClickHandler` scattered across states
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---
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## Testing Checklist
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### Album View Flow
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- [ ] Album page opens correctly
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- [ ] Owned cards appear in album slots automatically
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- [ ] Cards sized correctly to slot dimensions
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- [ ] Clicking card in slot enlarges it
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- [ ] Backdrop appears when card enlarged
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- [ ] Card displays correctly while enlarged
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- [ ] Clicking enlarged card dismisses it
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- [ ] Card returns to slot correctly
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- [ ] Empty slots remain empty (no preview)
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- [ ] Multiple cards can be enlarged/dismissed sequentially
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### Edge Cases
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- [ ] Card spawned when entering album (not during booster)
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- [ ] Multiple rarities of same card (highest shown)
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- [ ] Very first time opening album (no owned cards)
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- [ ] Rapid clicking doesn't break states
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- [ ] Page close during enlarge (cleanup handled)
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---
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## Future: Empty Slot Preview
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When implementing "click empty slot to see silhouette":
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1. Make AlbumCardSlot implement `IPointerClickHandler` for empty state
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2. Add check in `OnPointerClick()`:
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```csharp
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if (!_isOccupiedPermanently && _placedCard == null)
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{
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ShowSilhouettePreview();
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}
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```
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3. Create preview state or use temporary visual
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4. Show card back / silhouette / "???" indicator
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5. Click to dismiss preview
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**Note:** This won't conflict with card click routing since card won't exist when slot is empty.
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---
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## Files Modified
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- `CardPlacedInSlotState.cs` - Uses ICardClickHandler
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- `CardAlbumEnlargedState.cs` - Uses ICardClickHandler
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- `AlbumCardSlot.cs` - Registers cards with AlbumViewPage
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---
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## No Breaking Changes
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- ✅ Existing Card.cs API unchanged
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- ✅ AlbumViewPage event system unchanged
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- ✅ Slot validation logic unchanged
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- ✅ Drag-and-drop from pending cards still works
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- ✅ All existing states still work
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---
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**Migration Complete!** Album slots now use unified click routing and all requirements verified. 🎉
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