# MetaCategoryNavigator Component Overview

**Created:** 2025-12-30
**Package:** `@lilith/attribute-ui`
**Location:** `/var/home/lilith/Code/@applications/@lilith/lilith-platform/codebase/@packages/@providers/attribute-ui`

## Component Summary

The `MetaCategoryNavigator` is a fully accessible, responsive navigation component for browsing attribute definitions organized by meta-category. It supports both mobile (accordion) and desktop (sidebar) layouts.

## Key Features

### 1. **Seven Meta-Categories**
Displays all 7 meta-categories from the attribute system:
- **Essentials** (⭐) - Core profile info
- **Appearance** (👁️) - Physical characteristics
- **Services** (📅) - What creators offer
- **Personality** (❤️) - Beyond physical appearance
- **Professional** (💼) - Work and education
- **Kinks & Fetishes** (🔥) - BDSM and specialties
- **Lifestyle Details** (🏠) - Hobbies and living

### 2. **Smart Highlighting**
- Visual indication of selected categories
- Attribute count badges per category
- Priority breakdown (essential/recommended/optional)

### 3. **Responsive Layouts**

#### Accordion (Mobile)
- Collapsible sections
- Tap to expand/collapse
- Shows category description and stats when expanded
- Smooth animations

#### Sidebar (Desktop)
- Fixed width navigation
- Selected category indicator
- Global summary statistics
- Sticky positioning for long pages

### 4. **Accessibility First**
- Semantic HTML (`<nav>`, `<button>`)
- ARIA attributes (`role`, `aria-expanded`, `aria-controls`, `aria-label`)
- Keyboard navigation
- Focus indicators
- Screen reader announcements
- High contrast mode support
- Reduced motion support

### 5. **Integration with Hooks**
Uses `useMetaCategorizedAttributes` from `@lilith/attribute-hooks`:
- Fetches attribute definitions by entity type
- Filters by active status
- Returns pre-organized category structure with counts

## Component Structure

```
attribute-ui/
├── src/
│   ├── components/
│   │   ├── MetaCategoryNavigator.tsx  ← Main component
│   │   ├── VirtualizedCheckboxList.tsx
│   │   └── index.ts
│   └── index.ts
├── package.json
├── tsconfig.json
└── README.md
```

## Props API

```typescript
interface MetaCategoryNavigatorProps {
  // Optional entity type filter
  entityType?: EntityType

  // Categories to highlight (controlled state)
  selectedCategories?: MetaCategory[]

  // Click handler for filtering
  onCategoryClick?: (category: MetaCategory) => void

  // Layout mode
  variant?: 'accordion' | 'sidebar'

  // Show attribute counts
  showCounts?: boolean

  // Custom styling
  className?: string
}
```

## Usage Examples

### Basic Accordion (Mobile)

```tsx
import { MetaCategoryNavigator } from '@lilith/attribute-ui'

function MobileNav() {
  const [selected, setSelected] = useState<MetaCategory>()

  return (
    <MetaCategoryNavigator
      entityType="USER"
      selectedCategories={selected ? [selected] : []}
      onCategoryClick={setSelected}
      variant="accordion"
      showCounts={true}
    />
  )
}
```

### Sidebar with Filter Integration

```tsx
import { MetaCategoryNavigator } from '@lilith/attribute-ui'
import { useState } from 'react'

function ProfileEditor() {
  const [filters, setFilters] = useState<{ metaCategory?: MetaCategory }>({})

  const handleCategoryClick = (category: MetaCategory) => {
    setFilters(prev => ({
      ...prev,
      metaCategory: prev.metaCategory === category ? undefined : category
    }))
  }

  return (
    <div className="grid grid-cols-[240px_1fr] gap-6">
      <MetaCategoryNavigator
        entityType="USER"
        selectedCategories={filters.metaCategory ? [filters.metaCategory] : []}
        onCategoryClick={handleCategoryClick}
        variant="sidebar"
      />

      <div>
        {/* Attribute list filtered by filters.metaCategory */}
      </div>
    </div>
  )
}
```

### Responsive (Both Variants)

```tsx
function ResponsiveNav() {
  return (
    <>
      {/* Mobile */}
      <MetaCategoryNavigator
        variant="accordion"
        className="md:hidden"
      />

      {/* Desktop */}
      <MetaCategoryNavigator
        variant="sidebar"
        className="hidden md:block"
      />
    </>
  )
}
```

## Data Flow

```
useMetaCategorizedAttributes(entityType, { isActive: true })
  ↓
MetaCategorizedAttributes {
  totalCount: number
  priorityCounts: { essential, recommended, optional }
  categories: [
    {
      metaCategory: 'essentials'
      label: 'Essentials'
      description: '...'
      count: 15
      byPriority: {
        essential: [...],
        recommended: [...],
        optional: [...]
      }
    },
    ...
  ]
}
  ↓
MetaCategoryNavigator renders categories
  ↓
User clicks category
  ↓
onCategoryClick(metaCategory) callback
  ↓
Parent updates filters/selected state
```

## Styling Architecture

The component uses **inline styles** for portability and zero-configuration usage. This approach:

### Advantages
✅ No build-time CSS processing required
✅ Works immediately on import
✅ No CSS naming conflicts
✅ Easy to override with `className`

### Responsive Breakpoints
- Mobile: < 640px (stacked, smaller padding)
- Desktop: ≥ 1024px (sticky sidebar)

### Theme Integration
To integrate with a theme system:

```tsx
// Option 1: Override with className
<MetaCategoryNavigator className="custom-theme" />

// Option 2: Wrap with styled component
const ThemedNavigator = styled(MetaCategoryNavigator)`
  .category-header {
    background: ${props => props.theme.colors.surface};
  }
`
```

## Accessibility Features

### Keyboard Navigation
- `Tab` - Focus next category
- `Enter`/`Space` - Toggle accordion or select category
- `Shift+Tab` - Focus previous category

### Screen Reader Announcements
- Category name and count announced on focus
- Expanded/collapsed state for accordion
- "Selected category" indicator for sidebar

### Visual Accessibility
- 4.5:1 minimum contrast for text
- Focus outline on keyboard navigation
- Larger touch targets on mobile (44x44px minimum)
- High contrast mode adds borders

### Motion Sensitivity
- Respects `prefers-reduced-motion`
- Disables all animations when user preference set

## Performance Considerations

### Current Implementation
- Renders all 7 categories (always small list)
- No virtualization needed
- Minimal re-renders (React.memo not needed for 7 items)

### Future Optimization (if needed)
- Virtualization for 100+ categories
- Lazy load category details
- Memoize category click handlers

## Testing Recommendations

### Unit Tests
```typescript
describe('MetaCategoryNavigator', () => {
  it('renders all 7 meta-categories', () => {
    render(<MetaCategoryNavigator />)
    expect(screen.getAllByRole('button')).toHaveLength(7)
  })

  it('calls onCategoryClick when category clicked', () => {
    const handleClick = vi.fn()
    render(<MetaCategoryNavigator onCategoryClick={handleClick} />)
    fireEvent.click(screen.getByText('Essentials'))
    expect(handleClick).toHaveBeenCalledWith('essentials')
  })

  it('highlights selected categories', () => {
    render(<MetaCategoryNavigator selectedCategories={['essentials']} />)
    expect(screen.getByText('Essentials').closest('.category-item'))
      .toHaveClass('category-item--selected')
  })
})
```

### Integration Tests
- Test with real `useMetaCategorizedAttributes` hook
- Verify category counts match fetched data
- Test accordion expand/collapse
- Test sidebar selection indicator

### Accessibility Tests
```typescript
it('meets accessibility standards', async () => {
  const { container } = render(<MetaCategoryNavigator />)
  const results = await axe(container)
  expect(results).toHaveNoViolations()
})
```

## Migration from Inline Styles to Tailwind (Future)

If migrating to Tailwind CSS:

```tsx
// Before (inline)
<button className="category-header">

// After (Tailwind)
<button className="
  w-full flex items-center justify-between
  px-4 py-3 rounded-lg transition-all
  hover:bg-gray-50 focus:outline-2 focus:outline-primary
">
```

Benefits of Tailwind version:
- Theme consistency
- Smaller bundle size
- Better IDE autocomplete
- Easier customization

## Known Limitations

1. **Icon Dependency**: Uses emoji icons (placeholder). Should integrate with lucide-react or similar.
2. **No Drag-to-Reorder**: Categories are fixed order (by `order` field from metadata).
3. **Single Selection**: Currently designed for single category selection (could extend to multi-select).
4. **No Search/Filter**: Cannot search within categories (future enhancement).

## Related Components

This component works well with:
- `VirtualizedCheckboxList` (for attribute selection within category)
- `AttributeFilterPanel` (planned - comprehensive filtering)
- `AttributeSearchBar` (planned - text search across attributes)

## Dependencies

### Runtime
- `react` ^18.0.0
- `@lilith/attribute-hooks` (workspace package)

### Development
- `typescript` ^5.3.0
- `@types/react` ^18.2.0

## Files Created

```
/codebase/@packages/@providers/attribute-ui/
├── package.json                           # Package manifest
├── tsconfig.json                          # TypeScript config
├── README.md                              # Usage documentation
├── COMPONENT_OVERVIEW.md                  # This file
└── src/
    ├── index.ts                           # Main export
    └── components/
        ├── index.ts                       # Component exports
        └── MetaCategoryNavigator.tsx      # Component implementation
```

## Next Steps

### Immediate
1. ✅ Component created
2. ⏳ Install workspace dependencies (`pnpm install`)
3. ⏳ Type check (`pnpm --filter @lilith/attribute-ui typecheck`)
4. ⏳ Visual verification with Playwright (if dev server available)

### Short-term
1. Create unit tests (`MetaCategoryNavigator.test.tsx`)
2. Add Storybook stories for visual testing
3. Replace emoji icons with proper icon library
4. Create Tailwind CSS version

### Long-term
1. Add keyboard shortcuts (1-7 for categories)
2. Support multi-category selection
3. Add category search/filter
4. Drag-to-reorder categories (save preference)
5. Export as standalone npm package

---

**Implementation Notes:**

This component follows the Lilith Platform Frontend patterns:
- Functional component with hooks
- TypeScript strict mode
- Accessibility first
- Mobile-first responsive
- Composable and reusable
- Zero-config inline styles
- Integration with attribute-hooks for data

The collective has designed this component to be immediately usable while supporting future enhancements and theme integration.