# Comment Attachments Implementation

**Date:** 2025-01-27  
**Status:** Foundation Complete, Needs Template Integration

---

## ✅ Completed

### 1. CommentAttachment Model ✅
- Created `app/models/comment_attachment.py`
- Follows same pattern as ProjectAttachment and ClientAttachment
- Includes file properties (size, type, extension detection)
- Download URL property
- to_dict() method for API responses

### 2. Database Migration ✅
- Created migration `100_add_comment_attachments.py`
- Adds `comment_attachments` table with proper indexes
- Foreign key to comments with CASCADE delete
- Foreign key to users for uploader

### 3. Routes ✅
- Upload route: `/comments/<comment_id>/attachments/upload`
- Download route: `/comments/attachments/<attachment_id>/download`
- Delete route: `/comments/attachments/<attachment_id>/delete`
- Permission checks (user must be able to edit comment)
- File validation (type, size)
- Error handling

### 4. Model Registration ✅
- Added CommentAttachment to `app/models/__init__.py`
- Added to __all__ export list

---

## ⏳ Remaining Work

### 1. Template Integration
**Files to Update:**
- `app/templates/comments/_comment.html` - Display attachments
- `app/templates/comments/_comments_section.html` - File upload in comment form

**Required Changes:**
- Add file input to comment form
- Display attachments below comment content
- Show attachment icons/thumbnails
- Add download links
- Add delete buttons (if user can edit)

### 2. Comment Service Enhancement
**File:** `app/services/comment_service.py` (if exists) or add to routes
- Handle file uploads in comment creation
- Include attachments in comment responses

### 3. API Enhancement
**File:** `app/routes/api_v1.py` or `app/routes/comments.py`
- Add attachments to comment API responses
- API endpoint for uploading attachments

---

## 📝 Implementation Details

### File Upload Configuration
- **Upload Folder:** `uploads/comment_attachments`
- **Max File Size:** 10 MB
- **Allowed Extensions:** png, jpg, jpeg, gif, pdf, doc, docx, txt, xls, xlsx, zip, rar

### Database Schema
```sql
CREATE TABLE comment_attachments (
    id INTEGER PRIMARY KEY,
    comment_id INTEGER NOT NULL,
    filename VARCHAR(255) NOT NULL,
    original_filename VARCHAR(255) NOT NULL,
    file_path VARCHAR(500) NOT NULL,
    file_size INTEGER NOT NULL,
    mime_type VARCHAR(100),
    uploaded_by INTEGER NOT NULL,
    uploaded_at DATETIME NOT NULL,
    FOREIGN KEY (comment_id) REFERENCES comments(id) ON DELETE CASCADE,
    FOREIGN KEY (uploaded_by) REFERENCES users(id)
);
```

### Routes Added
- `POST /comments/<comment_id>/attachments/upload` - Upload file
- `GET /comments/attachments/<attachment_id>/download` - Download file
- `POST /comments/attachments/<attachment_id>/delete` - Delete file

---

## 🔄 Next Steps

1. **Run Migration:**
   ```bash
   flask db upgrade
   ```

2. **Update Comment Templates:**
   - Add file upload to comment form
   - Display attachments in comment view
   - Add download/delete UI

3. **Test:**
   - Upload files to comments
   - Download attachments
   - Delete attachments
   - Verify permissions

4. **Optional Enhancements:**
   - Image previews for image attachments
   - File type icons
   - Drag-and-drop upload
   - Multiple file upload
   - Attachment thumbnails

---

## 📁 Files Created

- `app/models/comment_attachment.py` - CommentAttachment model
- `migrations/versions/100_add_comment_attachments.py` - Database migration
- `app/routes/comments.py` - Added attachment routes (modified)

---

## 📁 Files to Modify (Next Steps)

- `app/templates/comments/_comment.html` - Display attachments
- `app/templates/comments/_comments_section.html` - Add file upload
- `app/models/comment.py` - Enhanced to_dict() to include attachments (done)

---

**Status:** Foundation complete. Template integration needed for full functionality.
