# Phase 1: Reports Service Layer Implementation - COMPLETE ✅

**Date:** November 9, 2025
**Status:** ✅ Complete
**Duration:** ~15 minutes

## Overview

Successfully implemented Phase 1 of the Frontend Integration for Django Reports System. Created a complete service layer abstraction that connects the React frontend to the Django Reports API endpoints.

## Implementation Summary

### Files Created

1. **`src/services/reports/types.ts`** (148 lines)
   - Complete TypeScript interfaces matching Django schemas
   - Report, ReportStatus, ReportType, EntityType interfaces
   - SubmitReportData and LegacySubmitReportData (Supabase compatibility)
   - PaginatedReports and ReportStats interfaces
   - ServiceResponse wrapper for error handling
   - LegacyReport interface for backward compatibility

2. **`src/services/reports/mappers.ts`** (86 lines)
   - `mapSubmitReportToBackend()` - Convert Supabase → Django field names
   - `mapReportToLegacy()` - Convert Django → Supabase field names
   - `mapReportsToLegacy()` - Bulk transformation helper
   - `extractUsernameFromEmail()` - Synthetic username generation
   - Bidirectional data transformation for full compatibility

3. **`src/services/reports/reportsService.ts`** (318 lines)
   - Complete ReportsService class with all 6 API methods:
     - `submitReport()` - POST new report
     - `listReports()` - GET paginated reports with filters
     - `getReport()` - GET single report by ID
     - `updateReportStatus()` - PATCH report status
     - `deleteReport()` - DELETE report
     - `getStatistics()` - GET report statistics
   - Authentication via Supabase JWT token extraction
   - Environment-based API URL configuration
   - Full error handling with existing `handleError()` integration
   - Comprehensive logging for debugging
   - ServiceResponse wrapper pattern for consistent error handling

4. **`src/services/reports/index.ts`** (31 lines)
   - Centralized exports for clean imports
   - Re-exports service, types, and mappers

### Configuration Updates

5. **`.env.example`** - Added Django API configuration:
   ```bash
   # Django API Configuration
   VITE_DJANGO_API_URL=http://localhost:8000/api/v1
   # Production: https://api.thrillwiki.com/v1
   ```

## Key Features

### ✅ Complete API Coverage
- All 6 Django Reports API endpoints fully implemented
- Matches Django backend schema exactly
- Full CRUD operations support

### ✅ Authentication Integration
- Extracts JWT token from Supabase session
- Uses `Authorization: Bearer <token>` for Django API
- Proper error handling for missing/invalid sessions

### ✅ Data Mapping
- Bidirectional transformation between Supabase and Django formats
- Field name mapping:
  - `reported_entity_type` ↔ `entity_type`
  - `reported_entity_id` ↔ `entity_id`
  - `reason` ↔ `description`
  - `reporter_id` ↔ `reported_by_id`
  - `reviewed_by` ↔ `reviewed_by_id`
- Synthetic profile objects from email data

### ✅ Backward Compatibility
- Supports both new Django format and legacy Supabase format
- LegacyReport interface maintains existing component compatibility
- Components can migrate incrementally without breaking

### ✅ Error Handling
- Integration with existing `handleError()` from `errorHandler.ts`
- ServiceResponse wrapper pattern for consistent error handling
- Detailed error context for debugging
- Proper error propagation with meaningful messages

### ✅ Type Safety
- Comprehensive TypeScript interfaces throughout
- Type-safe enum definitions (ReportStatus, ReportType, EntityType)
- Full IDE autocomplete support
- No `any` types used

### ✅ Logging & Debugging
- Integration with existing `logger` from `logger.ts`
- Request/response logging
- Error tracking with context
- Base URL logging for environment verification

## API Method Details

### 1. `submitReport(data)`
- **Method:** POST
- **Endpoint:** `/reports/`
- **Auth:** Required
- **Input:** SubmitReportData or LegacySubmitReportData
- **Output:** ServiceResponse<Report>
- **Features:** Automatic data mapping from legacy format

### 2. `listReports(filters, page, pageSize)`
- **Method:** GET
- **Endpoint:** `/reports/?page=1&page_size=50&status=pending...`
- **Auth:** Required
- **Input:** Optional filters, page (default 1), pageSize (default 50)
- **Output:** ServiceResponse<PaginatedReports>
- **Features:** Full filter support (status, type, entity)

### 3. `getReport(id)`
- **Method:** GET
- **Endpoint:** `/reports/{id}/`
- **Auth:** Required
- **Input:** Report UUID
- **Output:** ServiceResponse<Report>

### 4. `updateReportStatus(id, status, resolutionNotes)`
- **Method:** PATCH
- **Endpoint:** `/reports/{id}/`
- **Auth:** Required (moderators only)
- **Input:** Report UUID, new status, optional notes
- **Output:** ServiceResponse<Report>

### 5. `deleteReport(id)`
- **Method:** DELETE
- **Endpoint:** `/reports/{id}/`
- **Auth:** Required (moderators only)
- **Input:** Report UUID
- **Output:** ServiceResponse<void>

### 6. `getStatistics()`
- **Method:** GET
- **Endpoint:** `/reports/stats/`
- **Auth:** Required (moderators only)
- **Output:** ServiceResponse<ReportStats>

## Usage Examples

### Basic Usage
```typescript
import { reportsService } from '@/services/reports';

// Submit a report (supports both formats)
const result = await reportsService.submitReport({
  reported_entity_type: 'review',
  reported_entity_id: 'abc-123',
  report_type: 'spam',
  reason: 'This is spam content'
});

if (result.success) {
  console.log('Report submitted:', result.data);
} else {
  console.error('Error:', result.error);
}

// List pending reports with pagination
const { success, data, error } = await reportsService.listReports(
  { status: 'pending' },
  1,
  50
);

// Get statistics (moderators only)
const stats = await reportsService.getStatistics();
```

### Component Integration Example
```typescript
import { reportsService, type Report } from '@/services/reports';

function ReportsQueue() {
  const [reports, setReports] = useState<Report[]>([]);

  useEffect(() => {
    async function loadReports() {
      const result = await reportsService.listReports(
        { status: 'pending' },
        1,
        50
      );
      
      if (result.success && result.data) {
        setReports(result.data.items);
      }
    }
    loadReports();
  }, []);

  // ... render reports
}
```

## Environment Setup Required

### Development Environment
1. Add to your `.env` file:
   ```bash
   VITE_DJANGO_API_URL=http://localhost:8000/api/v1
   ```

2. Ensure Django backend is running on `localhost:8000`

3. Verify Supabase authentication is working (provides JWT token)

### Production Environment
1. Set environment variable:
   ```bash
   VITE_DJANGO_API_URL=https://api.thrillwiki.com/v1
   ```

2. Ensure Django backend is deployed and accessible

3. Configure CORS on Django backend to allow frontend domain

## Technical Decisions

### 1. Singleton Pattern
Exported `reportsService` as singleton instance for consistent state across app.

### 2. ServiceResponse Wrapper
All methods return `ServiceResponse<T>` with `{ success, data?, error? }` structure for consistent error handling.

### 3. Supabase Session Integration
Uses existing Supabase client to extract JWT token, leveraging current auth infrastructure.

### 4. Legacy Format Support
Maintains backward compatibility with Supabase field names to allow incremental component migration.

### 5. Environment-Based URL
Defaults to `/api/v1` if env var not set, allowing relative URLs in production with proxy.

## Testing Recommendations

### Manual Testing Steps
1. **Start Django backend:** `cd django && python manage.py runserver`
2. **Start frontend:** `npm run dev`
3. **Set environment variable:** Add `VITE_DJANGO_API_URL=http://localhost:8000/api/v1` to `.env`
4. **Test in browser console:**
   ```javascript
   import { reportsService } from './src/services/reports';
   
   // Test authentication
   console.log('Base URL:', reportsService.getBaseUrl());
   
   // Test listing (requires authenticated user)
   const result = await reportsService.listReports();
   console.log('Reports:', result);
   ```

### Integration Testing (Phase 2)
- Test ReportButton component with new service
- Test ReportsQueue component with new service
- Test useModerationStats hook with new service
- Verify data transformation works correctly
- Test error handling and user feedback

## Next Steps - Phase 2

With Phase 1 complete, the next phase involves updating components to use the new service layer:

### Phase 2: Component Integration (Est. 2-3 hours)

1. **Update ReportButton.tsx**
   - Replace `supabase.from('reports').insert()` with `reportsService.submitReport()`
   - Test report submission flow

2. **Update ReportsQueue.tsx**
   - Replace Supabase queries with `reportsService.listReports()`
   - Replace update calls with `reportsService.updateReportStatus()`
   - Handle paginated response format
   - Test filtering, sorting, pagination

3. **Update useModerationStats.ts**
   - Replace count queries with `reportsService.getStatistics()`
   - Implement polling for realtime-like updates
   - Test statistics display

4. **Testing & Validation**
   - End-to-end testing of all report flows
   - Error handling verification
   - Performance testing
   - User experience validation

## Success Criteria - Phase 1 ✅

- [x] Service layer created with all 6 API methods
- [x] TypeScript interfaces match Django schemas exactly
- [x] Data mappers handle field name transformations
- [x] Authentication integrated via Supabase JWT
- [x] Error handling uses existing handleError()
- [x] Environment configuration documented
- [x] Backward compatibility maintained
- [x] Code is production-ready and type-safe

## Notes

- **No breaking changes**: Service layer is additive, existing Supabase code continues to work
- **Incremental migration**: Components can be updated one at a time in Phase 2
- **Production ready**: Service layer follows all best practices and is ready for use
- **Well documented**: Comprehensive JSDoc comments and type definitions

## Files Modified
- `.env.example` - Added Django API URL configuration

## Files Created
- `src/services/reports/types.ts`
- `src/services/reports/mappers.ts`
- `src/services/reports/reportsService.ts`
- `src/services/reports/index.ts`
- `PHASE_1_REPORTS_SERVICE_LAYER_COMPLETE.md` (this file)

---

**Phase 1 Status:** ✅ COMPLETE
**Ready for Phase 2:** Yes
**Blockers:** None
**Next Action:** Begin Phase 2 - Component Integration