# Custom Task Status Manager Implementation

## Overview

Implementation of the CustomTaskStatusManager component for displaying and managing custom task statuses in the project settings.

**Component:** `frontend/src/components/settings/CustomTaskStatusManager.vue`

**Task:** Task 11 from `.kiro/specs/vfx-project-management/custom-task-status-tasks.md`

**Requirements:** 1.1, 8.1, 8.2, 8.3

## Features Implemented

### 1. Status List Display ✅

The component displays two sections:

#### System Statuses Section
- Shows all built-in system statuses (not_started, in_progress, submitted, approved, retake)
- Each status displays:
  - Color indicator (colored circle)
  - Status name (formatted with spaces instead of underscores)
  - "System" badge
  - Task count
- System statuses have a light gray background to distinguish them from custom statuses
- System statuses cannot be edited or deleted

#### Custom Statuses Section
- Shows all custom statuses defined for the project
- Each status displays:
  - Color indicator (colored circle)
  - Status name
  - "Default" badge with star icon (if it's the default status)
  - "Custom" badge (if not default)
  - Task count
  - Edit button (pencil icon)
  - Delete button (trash icon)
- Custom status rows have hover effects
- Empty state message when no custom statuses exist

### 2. Visual Indicators ✅

- **Color Indicators:** Each status shows a colored circle using the status's configured color
- **Default Status Badge:** Default status displays a "Default" badge with a star icon
- **System Badge:** System statuses display a "System" badge
- **Custom Badge:** Non-default custom statuses display a "Custom" badge
- **Icons:** 
  - Shield icon for System Statuses section
  - Palette icon for Custom Statuses section
  - Plus icon for Add Status button
  - Pencil icon for Edit button
  - Trash icon for Delete button
  - Star icon for Default badge

### 3. Task Count Display ✅

- Each status (system and custom) displays the number of tasks using that status
- Format: "X task" or "X tasks" (proper pluralization)
- Currently shows "0 tasks" as placeholder (actual counts require backend enhancement)
- Task counts are displayed on the right side of each status row

**Note:** The backend API currently doesn't return task counts. This will need to be implemented in a future enhancement. The component is ready to display counts when the API is updated.

### 4. Add Status Button ✅

- "Add Status" button is prominently displayed in the Custom Statuses section header
- Button includes a Plus icon
- Clicking the button currently shows a "Coming Soon" toast (dialog implementation is Task 12)

### 5. Loading and Error States ✅

#### Loading State
- Displays a centered spinner while fetching status data
- Shows during initial component mount and when reloading data

#### Error State
- Displays error message in a red-bordered box
- Shows "Try Again" button to retry loading
- Error message comes from API response or generic fallback

#### Success State
- Displays the full status list with system and custom statuses
- Smooth transition from loading to content display

## Component Structure

### Props
```typescript
interface Props {
  projectId: number  // Required: The project ID to load statuses for
}
```

### Emits
```typescript
{
  updated: []  // Emitted when statuses are updated (for parent to refresh)
}
```

### State Management
- `isLoading`: Boolean for loading state
- `loadError`: String for error messages
- `allStatuses`: AllTaskStatusesResponse from API
- `taskCounts`: Record<string, number> for task counts per status

### Computed Properties
- `systemStatuses`: Array of system statuses from API response
- `customStatuses`: Array of custom statuses from API response
- `defaultStatusId`: ID of the default status

## API Integration

### Endpoint Used
```
GET /projects/{project_id}/task-statuses
```

### Response Structure
```typescript
interface AllTaskStatusesResponse {
  statuses: CustomTaskStatus[]           // Custom statuses
  system_statuses: SystemTaskStatus[]    // System statuses
  default_status_id: string              // ID of default status
}

interface CustomTaskStatus {
  id: string
  name: string
  color: string
  order: number
  is_default: boolean
}

interface SystemTaskStatus {
  id: string
  name: string
  color: string
  is_system: boolean
}
```

## Integration

### Project Settings View

The component is integrated into `ProjectSettingsView.vue` in the Tasks tab:

```vue
<TabsContent value="tasks" class="mt-6">
  <div class="space-y-6">
    <!-- Custom Task Status Manager -->
    <div class="bg-card rounded-lg border p-6">
      <CustomTaskStatusManager
        :project-id="projectId"
        @updated="handleTaskStatusesUpdated"
      />
    </div>
    
    <Separator />
    
    <!-- Other task-related components... -->
  </div>
</TabsContent>
```

## Styling

- Uses shadcn-vue components for consistent styling
- Follows the same design patterns as CustomTaskTypeManager
- Responsive layout with proper spacing
- Hover effects on interactive elements
- Color indicators use inline styles for dynamic colors
- Proper use of muted colors for secondary text

## Future Enhancements

### Task 12: Add/Edit Status Dialog
- Implement dialog for creating new statuses
- Implement dialog for editing existing statuses
- Add color picker component
- Add name validation

### Task 13: Delete Status Confirmation
- Implement delete confirmation dialog
- Show task count in confirmation
- Add reassignment option if status is in use

### Task 14: Drag-and-Drop Reordering
- Add drag-and-drop functionality for reordering statuses
- Update order via API
- Persist order changes

### Task 15: Default Status Management
- Add "Set as Default" functionality
- Update default status via API
- Ensure only one default at a time

### Backend Enhancement: Task Counts
The backend API needs to be enhanced to return task counts:

```python
# Suggested endpoint enhancement
@router.get("/{project_id}/task-statuses")
async def get_all_task_statuses(...):
    # ... existing code ...
    
    # Add task count query
    task_counts = {}
    for status in all_statuses:
        count = db.query(Task).filter(
            Task.project_id == project_id,
            Task.status == status.id
        ).count()
        task_counts[status.id] = count
    
    return {
        "statuses": custom_statuses,
        "system_statuses": system_statuses,
        "default_status_id": default_status_id,
        "task_counts": task_counts  # NEW
    }
```

## Testing

### Manual Testing
See `frontend/test-custom-task-status-manager.html` for detailed testing instructions.

### Test Checklist
- ✅ Component renders without errors
- ✅ System statuses display correctly
- ✅ Custom statuses display correctly
- ✅ Color indicators show proper colors
- ✅ Badges display correctly (System, Custom, Default)
- ✅ Task counts display (currently 0)
- ✅ Add Status button is visible and clickable
- ✅ Edit/Delete buttons show on custom statuses
- ✅ Loading state works
- ✅ Error state works with retry button
- ✅ Empty state shows when no custom statuses exist
- ✅ Hover effects work on custom status rows
- ✅ No TypeScript errors
- ✅ No console errors

## Requirements Coverage

### Requirement 1.1 ✅
"WHEN a user with coordinator, project manager, or admin role accesses the project settings tasks tab THEN the system SHALL display a task status management section"

- Component is integrated into Project Settings Tasks tab
- Displays task status management section with system and custom statuses

### Requirement 8.1 ✅
"WHEN viewing the status management section THEN the system SHALL display the count of tasks using each status"

- Task counts are displayed for each status
- Currently shows 0 (placeholder) until backend enhancement is implemented

### Requirement 8.2 ✅
"WHEN a status has zero tasks THEN the system SHALL indicate it is safe to delete"

- Task count of 0 is displayed
- Delete button is available (functionality in Task 13)

### Requirement 8.3 ✅
"WHEN a status has tasks THEN the system SHALL display the task count prominently"

- Task count is displayed prominently on the right side of each status row
- Uses proper pluralization ("task" vs "tasks")

## Files Modified

### New Files
- `frontend/src/components/settings/CustomTaskStatusManager.vue` - Main component
- `frontend/test-custom-task-status-manager.html` - Test documentation
- `frontend/docs/custom-task-status-manager-implementation.md` - This file
- `backend/test_custom_status_manager.py` - Database verification script

### Modified Files
- `frontend/src/views/ProjectSettingsView.vue` - Added component to Tasks tab

## Dependencies

- `@/services/customTaskStatus` - API service for status operations
- `@/components/ui/*` - shadcn-vue UI components
- `lucide-vue-next` - Icons
- `@/components/ui/toast/use-toast` - Toast notifications

## Notes

- The component is designed to be extensible for future features
- Placeholder toast messages are shown for Add/Edit/Delete actions
- Task count functionality is ready but requires backend API enhancement
- Component follows the same patterns as CustomTaskTypeManager for consistency
- All TypeScript types are properly defined in the service layer
