# Design Document

## Overview

This design establishes consistent detail panel behavior across all entity browsers (shots, assets, tasks) in the VFX Project Management System. The design ensures users have a unified experience when working with detail panels regardless of the entity type.

## Architecture

The detail panel system uses a consistent state management pattern across all entity browsers:

- **Auto-Enable State**: Controls whether panels automatically show on entity selection
- **Manual Visibility State**: Controls manual panel visibility via keyboard shortcuts
- **Combined Logic**: Panel shows when either auto-enabled with selection OR manually visible

## Components and Interfaces

### State Variables (Per Browser)
```typescript
// Auto-enable toggle state
const isDetailPanelEnabled = ref(true)

// Manual visibility control
const isDetailPanelVisible = ref(false)

// Selected entity
const selectedEntity = ref<Entity | null>(null)
```

### Panel Visibility Logic
```typescript
// Panel shows when:
// 1. Auto-enabled AND entity selected, OR
// 2. Manually shown
const showPanel = computed(() => 
  selectedEntity.value && (isDetailPanelEnabled.value || isDetailPanelVisible.value)
)
```

### Keyboard Handler Interface
```typescript
interface KeyboardHandler {
  handleKeyDown(event: KeyboardEvent): void
  // Conditions:
  // - 'i' key pressed
  // - Entity selected
  // - No dialogs open
  // - Not typing in input fields
}
```

## Data Models

### Panel State Model
```typescript
interface DetailPanelState {
  isEnabled: boolean      // Auto-enable toggle
  isVisible: boolean      // Manual visibility
  selectedEntity: Entity | null
}
```

### Entity Selection Model
```typescript
interface EntitySelection {
  entity: Entity
  preserveManualState: boolean  // Don't reset manual visibility
}
```

## Correctness Properties

*A property is a characteristic or behavior that should hold true across all valid executions of a system-essentially, a formal statement about what the system should do. Properties serve as the bridge between human-readable specifications and machine-verifiable correctness guarantees.*

### Property 1: Manual Panel Persistence
*For any* entity browser with manually opened detail panel, selecting different entities should keep the panel visible and update content
**Validates: Requirements 2.1, 2.2, 2.3**

### Property 2: Keyboard Toggle Consistency  
*For any* entity browser, pressing 'i' key with selected entity should toggle panel visibility consistently
**Validates: Requirements 4.1**

### Property 3: Auto-Enable Independence
*For any* combination of auto-enable and manual states, the panel visibility should follow OR logic (show if either condition is true)
**Validates: Requirements 3.5**

### Property 4: Input Field Protection
*For any* keyboard event while focused on input fields, the 'i' key should not trigger panel toggle
**Validates: Requirements 4.2**

### Property 5: Selection State Preservation
*For any* entity selection while panel is manually visible, the manual visibility state should be preserved
**Validates: Requirements 2.1**

## Error Handling

### Invalid States
- No entity selected + manual panel visible → Hide panel
- Dialog open + keyboard shortcut → Ignore shortcut
- Input field focused + keyboard shortcut → Ignore shortcut

### State Recovery
- Invalid combinations reset to safe defaults
- Manual state cleared when no entity selected
- Auto-enable state persists across sessions

## Testing Strategy

### Unit Testing
- Test individual state transitions
- Test keyboard event handling
- Test panel visibility logic
- Test edge cases (no selection, dialogs open)

### Property-Based Testing
- Generate random entity selections and verify panel behavior
- Test keyboard events with various application states
- Verify state consistency across browser types
- Test auto-enable/manual state combinations

### Integration Testing
- Test behavior across all entity browsers
- Test session persistence
- Test mobile vs desktop behavior
- Test with real user workflows