# E-commerce Appointments API Quick Reference

## Base URL
```
/appointments
```

## Endpoints

### 1. Book Appointment
```http
POST /appointments/book
```

**Request:**
```json
{
  "merchant_id": "5starsaloon",
  "appointment_date": "2026-02-10",
  "start_time": "14:00",
  "services": [
    {
      "service_id": "service_123",
      "service_name": "Hair Cut & Styling",
      "duration_minutes": 60,
      "price": 500.0,
      "staff_id": "staff_456",
      "staff_name": "John Doe"
    }
  ],
  "customer_name": "Jane Smith",
  "customer_phone": "+919876543210",
  "customer_email": "jane@example.com",
  "notes": "First time customer"
}
```

**Response:**
```json
{
  "success": true,
  "message": "Appointment booked successfully",
  "appointment": {
    "appointment_id": "uuid",
    "merchant_id": "5starsaloon",
    "customer_id": "customer_123",
    "status": "booked",
    ...
  }
}
```

---

### 2. Get Appointment
```http
GET /appointments/{appointment_id}
```

**Response:**
```json
{
  "appointment_id": "uuid",
  "merchant_id": "5starsaloon",
  "customer_id": "customer_123",
  "customer_name": "Jane Smith",
  "customer_phone": "+919876543210",
  "appointment_date": "2026-02-10",
  "start_time": "14:00",
  "end_time": "15:00",
  "total_duration": 60,
  "services": [...],
  "status": "booked",
  "total_amount": 500.0,
  "currency": "INR"
}
```

---

### 3. List Appointments (Standard with Projection Support)
```http
POST /appointments/list
```

**Request (Full Response):**
```json
{
  "merchant_id": "5starsaloon",
  "status": "booked",
  "from_date": "2026-02-01",
  "to_date": "2026-02-28",
  "limit": 20,
  "offset": 0
}
```

**Request (With Projection - Minimal Response):**
```json
{
  "merchant_id": "5starsaloon",
  "status": "booked",
  "limit": 20,
  "offset": 0,
  "projection_list": ["appointment_id", "customer_name", "start_time", "status"]
}
```

**Response (Full):**
```json
{
  "appointments": [
    {
      "appointment_id": "uuid",
      "merchant_id": "5starsaloon",
      "customer_name": "Jane Smith",
      ...
    }
  ],
  "pagination": {
    "limit": 20,
    "offset": 0,
    "total": 5
  }
}
```

**Response (With Projection):**
```json
{
  "items": [
    {
      "appointment_id": "uuid",
      "customer_name": "Jane Smith",
      "start_time": "2026-02-10T14:00:00",
      "status": "booked"
    }
  ],
  "total": 5,
  "pagination": {
    "limit": 20,
    "offset": 0,
    "total": 5
  }
}
```

---

### 4. Get Available Slots
```http
POST /appointments/available-slots
```

**Request:**
```json
{
  "merchant_id": "5starsaloon",
  "appointment_date": "2026-02-10",
  "service_duration": 60,
  "staff_id": "staff_456"
}
```

**Response:**
```json
{
  "merchant_id": "5starsaloon",
  "appointment_date": "2026-02-10",
  "slots": [
    {
      "start_time": "09:00",
      "end_time": "09:30",
      "available": true
    },
    {
      "start_time": "09:30",
      "end_time": "10:00",
      "available": false
    }
  ],
  "business_hours": {
    "open": "09:00",
    "close": "18:00"
  }
}
```

---

### 5. Cancel Appointment
```http
DELETE /appointments/{appointment_id}/cancel
```

**Request:**
```json
{
  "cancellation_reason": "Customer requested reschedule"
}
```

**Response:**
```json
{
  "success": true,
  "message": "Appointment cancelled successfully",
  "appointment": {
    "appointment_id": "uuid",
    "status": "cancelled",
    ...
  }
}
```

---

### 6. Get My Appointments
```http
GET /appointments/customer/my-appointments?limit=20&offset=0
```

**Response:**
```json
{
  "appointments": [...],
  "pagination": {
    "limit": 20,
    "offset": 0,
    "total": 5
  }
}
```

---

## Filter Options for List Endpoint

| Filter | Type | Description |
|--------|------|-------------|
| `merchant_id` | string | Filter by merchant |
| `customer_id` | string | Filter by customer |
| `appointment_date` | date | Filter by specific date |
| `status` | enum | Filter by status (booked, confirmed, cancelled, completed, no_show) |
| `from_date` | date | Filter from date (inclusive) |
| `to_date` | date | Filter to date (inclusive) |
| `limit` | int | Max records (1-100, default: 20) |
| `offset` | int | Records to skip (default: 0) |
| `projection_list` | array | Fields to include (optional) |

---

## Projection List Fields

Available fields for projection:
- `appointment_id`
- `merchant_id`
- `customer_id`
- `customer_name`
- `customer_phone`
- `status`
- `start_time`
- `end_time`
- `notes`
- `created_by`

**Note:** When using `projection_list`, services are NOT included. Use full response to get service details.

---

## Status Values

| Status | Description |
|--------|-------------|
| `booked` | Initial state when customer books |
| `confirmed` | Merchant confirms the booking |
| `cancelled` | Customer or merchant cancels |
| `completed` | Service completed |
| `billed` | Payment processed (POS only) |
| `no_show` | Customer didn't show up |

---

## Error Responses

### 400 Bad Request
```json
{
  "detail": "Appointment time must be in the future"
}
```

### 404 Not Found
```json
{
  "detail": "Appointment not found"
}
```

### 500 Internal Server Error
```json
{
  "detail": "Failed to book appointment"
}
```

---

## Performance Tips

1. **Use Projection List**: Reduce payload size by 50-90%
   ```json
   {
     "projection_list": ["appointment_id", "customer_name", "start_time"]
   }
   ```

2. **Limit Results**: Use pagination for large datasets
   ```json
   {
     "limit": 10,
     "offset": 0
   }
   ```

3. **Filter Wisely**: Use specific filters to reduce query time
   ```json
   {
     "merchant_id": "5starsaloon",
     "appointment_date": "2026-02-10",
     "status": "booked"
   }
   ```

---

## Integration Examples

### React/Next.js
```typescript
// Book appointment
const response = await fetch('/appointments/book', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    merchant_id: '5starsaloon',
    appointment_date: '2026-02-10',
    start_time: '14:00',
    services: [{ service_id: 'svc_123', ... }],
    customer_name: 'Jane Smith',
    customer_phone: '+919876543210'
  })
});

// List with projection
const response = await fetch('/appointments/list', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    merchant_id: '5starsaloon',
    limit: 10,
    projection_list: ['appointment_id', 'customer_name', 'start_time']
  })
});
```

### Python
```python
import requests

# Book appointment
response = requests.post(
    'http://localhost:8000/appointments/book',
    json={
        'merchant_id': '5starsaloon',
        'appointment_date': '2026-02-10',
        'start_time': '14:00',
        'services': [{'service_id': 'svc_123', ...}],
        'customer_name': 'Jane Smith',
        'customer_phone': '+919876543210'
    }
)

# List with projection
response = requests.post(
    'http://localhost:8000/appointments/list',
    json={
        'merchant_id': '5starsaloon',
        'limit': 10,
        'projection_list': ['appointment_id', 'customer_name', 'start_time']
    }
)
```

---

## Notes

- All timestamps are in UTC
- Customer authentication via JWT (TODO: implement)
- Shared database with POS appointments
- Source field automatically set to 'online'
- Booking channel automatically set to 'app'