# Africa Alert - Complete Implementation Summary

## Phase 1: Database Schema ✅

### Sync Infrastructure Added to All Tables
```sql
-- Every table now has these columns:
last_synced_at DATETIME,
sync_status TEXT DEFAULT 'pending',  -- 'synced', 'pending', 'conflict'
is_deleted INTEGER DEFAULT 0
```

### Modules Implemented

| Module | Tables |
|--------|--------|
| **Payroll & HR** | staff_roles, salary_grades, staff_records, leave_types, leave_requests, staff_attendance, payroll_runs, payslips |
| **Inventory** | item_categories, suppliers, store_locations, items, item_stock, stock_transactions, item_issues |
| **Online Exams** | exam_groups, question_banks, exam_schedules, exam_attempts, exam_answers |
| **Hostel** | hostels, room_types, rooms, room_assignments, hostel_fees |
| **Transport** | vehicles, routes, pickup_points, vehicle_routes, transport_allocations |
| **Front Office** | admission_enquiries, visitor_logs, phone_call_logs, postal_dispatch, complaints |

---

## Phase 2: Sync Engine ✅

**File:** `server/src/services/SyncEngine.js`

### Features
- Background worker runs every 30 seconds (configurable)
- **Outbound (Push):** Local `pending` → Supabase
- **Inbound (Pull):** Supabase → Local (based on `updated_at`)
- **Conflict Resolution:** Server Wins policy
- **Error Logging:** Dedicated `sync_logs` table
- **Offline Mode:** Works without Supabase (syncs locally)

### Configuration
```javascript
// Environment variables
SUPABASE_URL=https://api.next_gen.techarvest.co.zw
SUPABASE_KEY=your-key
SYNC_INTERVAL=30000  // 30 seconds
```

### API Endpoints
- `GET /api/sync/status` - Get sync status
- `POST /api/sync/force` - Force sync

---

## Phase 3: Module Implementation

### Online Exams - Complete Vertical Slice ✅

#### Backend (`server/src/controllers/exams.controller.js`)

| Endpoint | Method | Description |
|----------|--------|-------------|
| `/api/exams/groups` | GET | List exam groups |
| `/api/exams/groups/:id` | GET | Get exam with questions |
| `/api/exams/groups` | POST | Create exam |
| `/api/exams/groups/:id` | PUT | Update exam |
| `/api/exams/groups/:id` | DELETE | Soft delete |
| `/api/exams/questions` | GET/POST | Questions CRUD |
| `/api/exams/questions/bulk` | POST | Bulk create |
| `/api/exams/schedules` | GET/POST | Exam schedules |
| `/api/exams/available` | GET | Student available exams |
| `/api/exams/attempts/start` | POST | Start exam attempt |
| `/api/exams/attempts/:id/answer` | POST | Save answer |
| `/api/exams/attempts/:id/submit` | POST | Submit & auto-grade |
| `/api/exams/attempts` | GET | Student attempt history |
| `/api/exams/results` | GET | Teacher results view |
| `/api/exams/stats` | GET | Exam statistics |

#### Frontend (`client/src/store/exams.ts`)
- Zustand store with full state management
- Auto-save answers
- Timer management
- Auto-submit on timeout

#### Frontend (`client/src/pages/exams/ExamViews.tsx`)
- **ExamListPage** - Admin/Teacher view
- **CreateExamModal** - 2-step wizard (details + questions)
- **TakeExamPage** - Student exam interface
- **ExamResultsPage** - Results with answer review

---

## Phase 4: Paynow Integration ✅

### Backend (`server/src/controllers/paynow.controller.js`)

| Endpoint | Method | Description |
|----------|--------|-------------|
| `/api/payments/initiate` | POST | Create Paynow transaction |
| `/api/payments/status/:id` | GET | Check transaction status |
| `/api/payments/webhook` | POST | Paynow callback handler |
| `/api/payments/student/:id` | GET | Student payment history |
| `/api/payments/:id` | DELETE | Cancel pending payment |

### Frontend (`client/src/components/PaynowPayment.tsx`)
- **PayFeesModal** - Full payment flow
- **PaymentSuccessView** - Success confirmation
- **PaymentHistory** - Payment history display

---

## Replication Pattern for Remaining Modules

To implement remaining modules, follow this pattern:

### 1. Backend Controller Template

```javascript
// server/src/controllers/[module].controller.js

const dbPath = process.env.DB_PATH || path.join(__dirname, '../../../data/school.db');
const Database = require('better-sqlite3');
const db = new Database(dbPath);
db.pragma('foreign_keys = ON');

// Auth middleware
const auth = (req, res, next) => {
  const token = req.headers.authorization?.split(' ')[1];
  if (!token) return res.status(401).json({ error: 'No token provided' });
  try {
    req.user = require('jsonwebtoken').verify(token, process.env.JWT_SECRET);
    next();
  } catch (err) {
    res.status(401).json({ error: 'Invalid token' });
  }
};

// Standard CRUD endpoints...
// All writes set sync_status = 'pending'

module.exports = router;
```

### 2. Frontend Store Template

```typescript
// client/src/store/[module].ts

import { create } from 'zustand';
import { api } from './auth';

interface [Module]Store {
  items: any[];
  currentItem: any | null;
  
  fetchItems: (filters?: any) => Promise<void>;
  createItem: (data: any) => Promise<any>;
  updateItem: (id: number, data: any) => Promise<void>;
  deleteItem: (id: number) => Promise<void>;
}

export const use[Module]Store = create<[Module]Store>((set, get) => ({
  items: [],
  currentItem: null,
  
  fetchItems: async (filters) => {
    const params = new URLSearchParams(filters || {});
    const response = await api.get(`/[module]?${params}`);
    set({ items: response.data });
  },
  
  createItem: async (data) => {
    const response = await api.post('/[module]', data);
    set(state => ({ items: [response.data, ...state.items] }));
    return response.data;
  },
  
  updateItem: async (id, data) => {
    const response = await api.put(`/[module]/${id}`, data);
    set(state => ({
      items: state.items.map(i => i.id === id ? { ...i, ...response.data } : i)
    }));
  },
  
  deleteItem: async (id) => {
    await api.delete(`/[module]/${id}`);
    set(state => ({ items: state.items.filter(i => i.id !== id) }));
  },
}));
```

### 3. Frontend Page Template

```typescript
// client/src/pages/[module]/[Module]Page.tsx

import { use[Module]Store } from '../../store/[module]';
import { Plus, Edit, Trash2, Search } from 'lucide-react';

export function [Module]Page() {
  const { items, fetchItems, createItem, deleteItem } = use[Module]Store();
  
  useEffect(() => { fetchItems(); }, []);
  
  return (
    <div className="space-y-6">
      {/* Header with Add Button */}
      <div className="flex justify-between">
        <h1>[Module Name]</h1>
        <button onClick={() => setShowModal(true)}>
          <Plus /> Add
        </button>
      </div>
      
      {/* Filter/Search Bar */}
      {/* Data Table */}
      {/* Pagination */}
      
      {/* Create/Edit Modal */}
      {/* Delete Confirmation */}
    </div>
  );
}
```

### 4. Register Routes in index.js

```javascript
// server/src/index.js

const [module]Controller = require('./controllers/[module].controller');
app.use('/api/[module]', [module]Controller);
```

### 5. Add to Navigation

```typescript
// client/src/components/Nav.tsx

const NAV_CONFIG = {
  admin: [
    // ... existing
    { path: '/[module]', label: '[Module]', icon: Icon },
  ],
};
```

---

## File Structure Summary

```
africa-alert-pwa/
├── server/src/
│   ├── database/
│   │   └── init.js                    ✅ Complete schema
│   ├── services/
│   │   └── SyncEngine.js              ✅ Bidirectional sync
│   ├── controllers/
│   │   ├── exams.controller.js       ✅ Online exams API
│   │   └── paynow.controller.js       ✅ Payment gateway
│   └── index.js                      (update with new routes)
├── client/src/
│   ├── store/
│   │   ├── auth.ts
│   │   └── exams.ts                   ✅ Exam state
│   ├── pages/
│   │   └── exams/
│   │       └── ExamViews.tsx         ✅ 4 complete views
│   ├── components/
│   │   └── PaynowPayment.tsx         ✅ Payment modal
│   └── App.tsx                       (update with routes)
└── data/                             (SQLite database)
```

---

## Quick Start Commands

```bash
# Navigate to project
cd africa-alert-pwa

# Initialize database (first run)
cd server && node src/database/init.js

# Start backend
cd server && npm run dev

# Start frontend (new terminal)
cd client && npm run dev

# Run with Docker
docker-compose up -d
```

---

## Environment Configuration

Create `.env` file:

```env
# Server
PORT=3001
JWT_SECRET=your-secret-key

# Database
DB_PATH=./data/school.db

# Sync
SUPABASE_URL=https://api.next_gen.techarvest.co.zw
SUPABASE_KEY=your-supabase-key
SYNC_INTERVAL=30000

# Paynow
PAYNOW_INTEGRATION_ID=your-id
PAYNOW_INTEGRATION_KEY=your-key
PAYNOW_RETURN_URL=http://localhost:3000/fees
PAYNOW_BLOCKING_URL=http://localhost:3000/api/payments/webhook
```

---

## Demo Accounts

| Role | Email | Password |
|------|-------|----------|
| Admin | admin@school.com | admin123 |
| Teacher | teacher@school.com | teacher123 |
| Student | student@school.com | student123 |
| Parent | parent@school.com | parent123 |

---

*Implementation Complete: June 2026*  
*Africa Alert School Management PWA v2.0*