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## Task ID: 3-c - full-stack-developer
### Work Task
Create the FOURNISSEURS (Supplier Management) module with supplier list, add/edit forms, supplier detail view, and active/inactive status functionality.

### Work Summary
Successfully implemented the complete FOURNISSEURS (Supplier Management) module for the OptiqueStock application. The module includes three comprehensive frontend components, full API support for CRUD operations, and integration with the main application navigation.

**Frontend Components Created:**

1. **SupplierList.tsx** - Main supplier management interface featuring:
   - Full supplier table with columns for name, contact, address, products count, status, and actions
   - Advanced search filtering by name, contact, email, phone, city, and postal code
   - Status filter buttons (All, Active, Inactive) with dynamic counts
   - Statistics cards showing total, active, and inactive supplier counts
   - Color-coded status badges (green for active, gray for inactive)
   - Action buttons for view, edit, activate/deactivate, and delete operations
   - Toast notifications for user feedback
   - Responsive design with mobile-friendly layouts
   - ScrollArea for table handling with custom scrollbar styling

2. **SupplierForm.tsx** - Form dialog for creating and editing suppliers with:
   - React Hook Form integration with Zod schema validation
   - Four organized sections: General Information, Contact Details, Address, and Additional Information
   - Fields for company name (required), contact person, phone, email, address, city, postal code, notes, and active status
   - Switch control for active/inactive status toggle with explanatory text
   - Support for both create and edit modes with pre-populated data
   - Comprehensive form validation with French error messages
   - Loading state during form submission
   - Cancel and submit buttons with proper disabled states

3. **SupplierDetail.tsx** - Detailed supplier information view with:
   - Complete supplier information display with appropriate icons (Phone, Mail, MapPin, Calendar, Building2)
   - Product statistics and purchase invoice history
   - Associated products list showing reference, designation, category, stock, and price
   - Purchase invoices list showing number, date, status (BROUILLON/VALIDE), and amount
   - Action buttons to edit supplier and toggle active status
   - Currency formatting using French locale (EUR)
   - Date formatting in French locale
   - ScrollArea components for products and invoices lists
   - Status badges with appropriate color coding
   - Total purchase amount calculation and display

**API Routes Created/Enhanced:**

1. **GET/POST /api/fournisseurs** (Enhanced)
   - Updated GET route to include product and invoice counts via _count select
   - Maintains existing POST route for supplier creation with validation
   - Orders suppliers alphabetically by name

2. **GET/PUT/DELETE /api/fournisseurs/[id]** (New)
   - GET: Retrieve single supplier with product and invoice counts
   - PUT: Update supplier with partial field support and validation
   - DELETE: Delete supplier with protection for associated products and invoices
   - Proper error handling and HTTP status codes

3. **GET /api/fournisseurs/[id]/factures** (New)
   - Fetches all purchase invoices for a specific supplier
   - Returns invoices ordered by date (newest first)
   - Validates supplier existence before fetching invoices

**Integration:**

- Integrated Supplier Management module into main page navigation in `/src/app/page.tsx`
- Added import for SupplierList component
- Added case handler to render SupplierList when FOURNISSEURS module is selected
- Module is accessible from the home page dashboard via the "Fournisseurs" card

**Technical Implementation:**

- All components follow existing code patterns from client and product modules
- Used shadcn/ui components throughout: Table, Dialog, Form, Input, Button, Badge, Card, ScrollArea, Switch, Separator
- Implemented proper TypeScript interfaces for all data types (Supplier, Product, Invoice)
- Added comprehensive error handling and user feedback with toast notifications
- All forms include validation with Zod schemas
- Followed responsive design patterns with consistent Tailwind CSS styling
- Active/Inactive status system prevents selection of inactive suppliers in other modules
- Protected deletion of suppliers with associated data (products or invoices)

**Key Features:**

- Full CRUD operations for supplier management
- Search and filter functionality with real-time updates
- Active/inactive status toggle with visual feedback
- Supplier detail view showing complete information and history
- Product and invoice association tracking
- Statistics dashboard for quick overview
- Responsive design that works on mobile, tablet, and desktop
- French language UI for better localization
- Toast notifications for all user actions
- Data validation on both client and server side
