# Project Thumbnail Upload Implementation

## Overview

This document describes the frontend implementation of project thumbnail upload functionality for the VFX Project Management System, completing Task 22 from the implementation plan.

## Completed Tasks

### Task 22.4: Update Project Type Definitions ✅

**File**: `frontend/src/services/project.ts`

Added `thumbnail_url` field to the Project interface:
```typescript
export interface Project {
  // ... existing fields ...
  thumbnail_url?: string | null
}
```

Added thumbnail upload and delete methods to projectService:
```typescript
async uploadThumbnail(projectId: number, file: File): Promise<{ message: string; thumbnail_url: string }>
async deleteThumbnail(projectId: number): Promise<void>
```

### Task 22.1: Add Thumbnail Preview and Management ✅

**File**: `frontend/src/components/project/ProjectThumbnailUpload.vue`

Created a comprehensive thumbnail upload component with:

**Features**:
- Current thumbnail display with 48x32 preview
- Project initials placeholder when no thumbnail exists
- Click-to-upload button with file input
- Drag-and-drop upload area (shown when no thumbnail)
- Replace thumbnail functionality
- Remove thumbnail button
- Upload progress indicator
- Client-side file validation (format and size)
- Error message display
- Responsive layout

**Validation**:
- Accepted formats: JPG, JPEG, PNG, GIF, WEBP
- Maximum file size: 10MB
- Real-time validation feedback

**User Experience**:
- Camera icon overlay for quick upload
- Visual drag-and-drop zone with hover states
- Loading states during upload/removal
- Toast notifications for success/error
- Confirmation dialog before removal

### Task 22.2: Integrate Thumbnail Upload in Project Settings ✅

**File**: `frontend/src/views/ProjectSettingsView.vue`

Integrated the thumbnail upload component into the General Settings tab:

**Changes**:
1. Imported `ProjectThumbnailUpload` component
2. Added thumbnail section at the top of General Settings tab
3. Separated thumbnail and project details with a divider
4. Added event handlers for thumbnail updates:
   - `handleThumbnailUpdated`: Updates project in store when thumbnail is uploaded
   - `handleThumbnailRemoved`: Clears thumbnail in store when removed

**Layout**:
```
General Settings Tab
├── Project Thumbnail Section (new)
│   └── ProjectThumbnailUpload component
├── Separator
└── Project Details Section
    └── ProjectEditForm component
```

### Task 22.3: Update Project Card to Display Thumbnails ✅

**File**: `frontend/src/views/ProjectsView.vue`

Enhanced project cards to display thumbnails:

**Visual Changes**:
1. Added 40px height thumbnail area at top of each card
2. Displays uploaded thumbnail with `object-cover` for proper aspect ratio
3. Shows gradient placeholder with project initials when no thumbnail
4. Moved status badge to overlay on thumbnail (top-right corner)
5. Implemented lazy loading for performance

**Placeholder Design**:
- Gradient background (primary colors)
- Large project initials (4xl font)
- Folder icon below initials
- Consistent with brand aesthetic

**Helper Functions**:
```typescript
getThumbnailUrl(url): Constructs full URL from API path
getProjectInitials(name): Generates 2-letter initials from project name
```

## Component API

### ProjectThumbnailUpload

**Props**:
- `projectId: number` - The project ID for upload/delete operations
- `currentThumbnailUrl?: string | null` - Current thumbnail URL (if exists)
- `projectName?: string` - Project name for generating initials

**Events**:
- `thumbnail-updated(thumbnailUrl: string)` - Emitted when thumbnail is uploaded
- `thumbnail-removed()` - Emitted when thumbnail is deleted

**Usage Example**:
```vue
<ProjectThumbnailUpload
  :project-id="project.id"
  :current-thumbnail-url="project.thumbnail_url"
  :project-name="project.name"
  @thumbnail-updated="handleThumbnailUpdated"
  @thumbnail-removed="handleThumbnailRemoved"
/>
```

## User Workflows

### Upload Thumbnail Workflow

1. User navigates to Project Settings → General tab
2. User sees current thumbnail or placeholder with initials
3. User clicks "Upload Thumbnail" button or drags file to drop zone
4. File is validated (format and size)
5. Upload progress is shown
6. On success:
   - Thumbnail is displayed in preview
   - Success toast notification appears
   - Project card in projects list updates automatically
7. On error:
   - Error message is displayed
   - Error toast notification appears

### Replace Thumbnail Workflow

1. User sees existing thumbnail in settings
2. User clicks "Replace Thumbnail" button
3. Selects new file
4. Old thumbnail is automatically deleted
5. New thumbnail is uploaded and displayed

### Remove Thumbnail Workflow

1. User clicks "Remove" button
2. Confirmation dialog appears
3. On confirm:
   - Thumbnail is deleted from server
   - Placeholder with initials is shown
   - Success toast notification appears
   - Project card reverts to placeholder

## Technical Details

### File Upload

- Uses `FormData` for multipart file upload
- Sends to `POST /api/projects/{projectId}/thumbnail`
- Backend processes and resizes image
- Returns thumbnail URL in response

### File Deletion

- Sends to `DELETE /api/projects/{projectId}/thumbnail`
- Backend removes file from filesystem
- Clears `thumbnail_path` in database

### State Management

- Thumbnail URL is stored in project object
- Updates propagate through Pinia store
- All components using project data see updates automatically

### URL Construction

Thumbnails are served from the backend:
```
http://localhost:8000/api/files/projects/{projectId}/thumbnail
```

The component handles both relative and absolute URLs.

## Testing

A comprehensive test file is provided at `frontend/test-project-thumbnail.html`:

**Test Cases**:
1. Fetch projects with thumbnail URLs
2. Upload thumbnail to selected project
3. Delete thumbnail from project
4. Display all projects with thumbnails/placeholders

**To Run Tests**:
1. Ensure backend is running on `http://localhost:8000`
2. Open `frontend/test-project-thumbnail.html` in browser
3. Tests will auto-login and fetch projects
4. Use UI to test upload/delete operations

## Integration Points

### Backend API Endpoints

- `POST /api/projects/{project_id}/thumbnail` - Upload thumbnail
- `DELETE /api/projects/{project_id}/thumbnail` - Delete thumbnail
- `GET /api/files/projects/{project_id}/thumbnail` - Serve thumbnail
- `GET /api/projects/` - List projects (includes thumbnail_url)
- `GET /api/projects/{project_id}` - Get project (includes thumbnail_url)

### Frontend Components

- `ProjectThumbnailUpload.vue` - Main upload component
- `ProjectSettingsView.vue` - Settings integration
- `ProjectsView.vue` - Project cards display

### Services

- `projectService.uploadThumbnail()` - Upload API call
- `projectService.deleteThumbnail()` - Delete API call

### Stores

- `projectsStore` - Manages project state including thumbnails

## Design Decisions

### Thumbnail Size

- Preview: 48x32 (3:2 aspect ratio)
- Card display: Full width, 40px height
- Backend processes to max 800x600 while maintaining aspect ratio

### Placeholder Design

- Uses project initials (first letter of first two words)
- Gradient background for visual appeal
- Folder icon for context
- Consistent with avatar placeholder pattern

### Upload UX

- Drag-and-drop for convenience
- Click-to-browse for traditional users
- Immediate visual feedback
- Progress indicators during operations
- Toast notifications for all outcomes

### Validation

- Client-side validation before upload (saves bandwidth)
- Server-side validation for security
- Clear error messages for users

## Future Enhancements

Potential improvements for future iterations:

1. **Image Cropping**: Add client-side cropping tool before upload
2. **Multiple Thumbnails**: Support different sizes for different contexts
3. **Thumbnail Gallery**: Show history of previous thumbnails
4. **Bulk Upload**: Upload thumbnails for multiple projects at once
5. **Auto-generation**: Generate thumbnail from project assets
6. **Thumbnail Templates**: Provide pre-designed templates
7. **Compression Options**: Let users choose quality vs. file size

## Related Documentation

- Backend Implementation: `backend/docs/project-thumbnail-implementation.md`
- Requirements: Requirement 2.1 in requirements.md
- Design: Project Thumbnail section in design.md
- Tasks: Task 22 in tasks.md

## Files Modified

### Created
- `frontend/src/components/project/ProjectThumbnailUpload.vue`
- `frontend/test-project-thumbnail.html`
- `frontend/docs/project-thumbnail-implementation.md`

### Modified
- `frontend/src/services/project.ts` - Added thumbnail methods and type
- `frontend/src/views/ProjectSettingsView.vue` - Integrated upload component
- `frontend/src/views/ProjectsView.vue` - Added thumbnail display to cards

## Verification

To verify the implementation:

1. **Visual Check**: Open project settings and see thumbnail upload section
2. **Upload Test**: Upload a thumbnail and verify it appears
3. **Display Test**: Check projects list shows thumbnails
4. **Replace Test**: Replace existing thumbnail with new one
5. **Delete Test**: Remove thumbnail and verify placeholder appears
6. **Persistence Test**: Refresh page and verify thumbnail persists

All tests should pass with the provided test HTML file.

## Conclusion

Task 22 has been successfully completed with all subtasks implemented:
- ✅ 22.1: Thumbnail preview and management component
- ✅ 22.2: Integration in project settings
- ✅ 22.3: Display in project cards
- ✅ 22.4: Type definitions updated

The implementation provides a complete, user-friendly thumbnail management system that enhances project visual identification throughout the application.
