Task ID: 3-f - Full-Stack Developer

Task: Module Rapports (Reports)

Objective

Create a comprehensive Reports (RAPPORTS) module for the OptiqueStock optical store management system with dashboard KPIs, sales reports, inventory reports, and export functionality.

Work Completed

Frontend Development

Created ReportsModule.tsx (/src/components/reports/ReportsModule.tsx)
- Comprehensive React component with tab-based interface
- Three main sections: Dashboard, Sales Reports, Inventory Reports
- Date range filter (today, week, month, year)
- Export to CSV functionality
- Real-time data fetching with loading states
- Error handling with toast notifications
- Responsive design using Tailwind CSS
Dashboard Features
- 8 KPI cards displaying:
  - Daily sales count
  - Daily revenue (TTC)
  - Total clients
  - Pending workshop orders with alert
  - Weekly sales count
  - Weekly revenue
  - Monthly sales count
  - Monthly revenue
- Top 5 selling products with quantity and revenue
- Low stock alerts with visual indicators (red badges, triangle icons)
- Scroll areas for long lists
Sales Reports Features
- Bar chart showing sales evolution and revenue over time
- Pie chart for sales distribution by product category
- Horizontal bar chart for payment method distribution
- Table showing sales by employee with performance metrics
- Date range filtering affecting all data
Inventory Reports Features
- Total stock valuation display
- Bar chart showing stock value by category
- Detailed category breakdown table with:
  - Total products count
  - Active products count
  - Total stock quantity
  - Stock value
- Low stock items list with detailed information
Visual Components
- Used shadcn/ui components: Card, Button, Tabs, Badge, ScrollArea, Select, Table
- Integrated Recharts for data visualization:
  - BarChart for sales evolution and stock valuation
  - PieChart for category distribution
  - Responsive charts with tooltips and legends
- Custom color scheme for different categories
- Icons from Lucide React for visual enhancement

Backend API Development

Created Dashboard API (/src/app/api/reports/dashboard/route.ts)
- Endpoint: GET /api/reports/dashboard
- Calculates sales counts for today, week, month, year
- Computes revenue (HT and TTC) for today and month
- Retrieves total client count
- Identifies top 5 selling products by quantity
- Lists products below minimum stock level
- Counts pending workshop orders (EN_ATTENTE status)
- Returns aggregated KPI data
Created Sales Reports API (/src/app/api/reports/sales/route.ts)
- Endpoint: GET /api/reports/sales?range={today|week|month|year}
- Sales by date with grouping and formatting
- Sales by product category with count and revenue
- Sales by employee with performance metrics
- Sales by payment method with amount distribution
- Date range filtering using date-fns
- Proper French labels for payment methods
Created Inventory Reports API (/src/app/api/reports/inventory/route.ts)
- Endpoint: GET /api/reports/inventory
- Stock valuation by category
- Total stock value calculation
- Low stock items with value calculation
- Category breakdown with comprehensive statistics
- Active/inactive product filtering
Created Export APIs
- Sales Export (/src/app/api/reports/export/sales/route.ts)
  - Endpoint: GET /api/reports/export/sales?range={today|week|month|year}
  - Exports all sales with details (client, employee, products, payments)
  - CSV format with proper escaping
  - Includes: sale number, date, client, employee, products, quantities, amounts, discount, payment methods, workshop status
  - French date formatting
- Inventory Export (/src/app/api/reports/export/inventory/route.ts)
  - Endpoint: GET /api/reports/export/inventory
  - Exports all active products with stock information
  - CSV format with comprehensive product data
  - Includes: reference, designation, category, brand, supplier, stock levels, prices, TVA, stock value, location, barcode, stock status
- Low Stock Export (/src/app/api/reports/export/lowStock/route.ts)
  - Endpoint: GET /api/reports/export/lowStock
  - Exports products below minimum stock level
  - CSV format with reordering information
  - Includes: reference, designation, category, brand, supplier, current stock, minimum stock, deficit, purchase price, order value, location, barcode

Integration

Integrated Reports Module into Main Navigation
- Added ReportsModule import to /src/app/page.tsx
- Created render condition for RAPPORTS module
- Consistent header styling with other modules (cyan color scheme)
- Back to home button navigation
- Module accessible from home page navigation grid

Technical Implementation Details

State Management: React useState for managing tabs, date range, loading states, and data
Data Fetching: useEffect hooks with dependency arrays for reactive data loading
Error Handling: Try-catch blocks with toast notifications for user feedback
Type Safety: TypeScript interfaces for all data structures
Date Handling: date-fns library for date manipulation and formatting
Chart Configuration: Custom chart config object with category colors
CSV Generation: Client-side download using Blob and URL.createObjectURL
API Design: RESTful endpoints with proper error handling and JSON responses
Database Queries: Prisma aggregations and groupBy for efficient data summarization
Performance: Parallel database queries using Promise.all where applicable

Files Created

/src/components/reports/ReportsModule.tsx - Main reports frontend component
/src/app/api/reports/dashboard/route.ts - Dashboard data API
/src/app/api/reports/sales/route.ts - Sales reports API
/src/app/api/reports/inventory/route.ts - Inventory reports API
/src/app/api/reports/export/sales/route.ts - Sales CSV export API
/src/app/api/reports/export/inventory/route.ts - Inventory CSV export API
/src/app/api/reports/export/lowStock/route.ts - Low stock CSV export API

Files Modified

/src/app/page.tsx - Added ReportsModule import and render condition

Key Features Delivered

✅ Dashboard with 8 KPIs (sales, revenue, clients, workshop orders) ✅ Top 5 selling products display ✅ Low stock alerts with visual indicators ✅ Sales reports by date, category, employee, and payment method ✅ Inventory reports with stock valuation and category breakdown ✅ Interactive charts using Recharts (bar charts, pie charts) ✅ Date range filtering for reports ✅ CSV export functionality for sales, inventory, and low stock ✅ Responsive design for mobile and desktop ✅ Consistent styling with shadcn/ui components ✅ French language interface ✅ Error handling and user feedback ✅ Integration with main application navigation

Testing Notes

Module is accessible from the home page under "Rapports"
All API endpoints follow RESTful conventions
CSV exports work with proper encoding and formatting
Charts are responsive and include tooltips
Date range filtering updates data dynamically
Loading states provide good user feedback
Error messages are displayed via toast notifications

Limitations

CSV export only (Excel and PDF not implemented due to library constraints)
Charts use English labels internally but data is French
No real-time updates (requires manual refresh or tab switch)
Employee data may show "Inconnu" if employeId is null
Some KPIs may show 0 if no data exists in the database

Next Steps (Optional Enhancements)

Add Excel export using xlsx library
Add PDF export using jsPDF or similar
Implement real-time updates with polling or WebSocket
Add more advanced date range picker (custom date ranges)
Add drill-down capabilities for chart items
Add comparison views (e.g., compare with previous period)
Add more report types (employee performance, product trends, etc.)
Implement report scheduling and email delivery
Add print-friendly layouts for reports

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