# User Invitations API Guide

## Overview
Complete API documentation for the user invitation system.

## Base URL
```
/api/v1/invitations
```

---

## Endpoints

### 1. Create Invitation
**POST** `/api/v1/invitations`

Create a new user invitation and send notification.

**Authorization:** Required (platform_admin, client_admin, contractor_admin)

**Request Body:**
```json
{
  "email": "john@example.com",
  "phone": "+254712345678",
  "role": "field_agent",
  "contractor_id": "uuid",
  "invitation_method": "whatsapp"
}
```

**Response:** `201 Created`
```json
{
  "id": "uuid",
  "email": "john@example.com",
  "phone": "+254712345678",
  "invited_role": "field_agent",
  "contractor_id": "uuid",
  "client_id": null,
  "token": "secure_random_token",
  "status": "pending",
  "invitation_method": "whatsapp",
  "invited_by_user_id": "uuid",
  "invited_at": "2025-11-16T10:00:00Z",
  "expires_at": "2025-11-19T10:00:00Z",
  "accepted_at": null,
  "whatsapp_sent": true,
  "whatsapp_sent_at": "2025-11-16T10:00:01Z",
  "email_sent": false,
  "email_sent_at": null,
  "invitation_metadata": {},
  "created_at": "2025-11-16T10:00:00Z",
  "updated_at": "2025-11-16T10:00:00Z"
}
```

---

### 2. List Invitations
**GET** `/api/v1/invitations`

List invitations with pagination and filters.

**Authorization:** Required

**Query Parameters:**
- `skip` (int, default: 0) - Number of records to skip
- `limit` (int, default: 50, max: 100) - Records per page
- `status` (string, optional) - Filter by status: pending, accepted, expired, cancelled
- `client_id` (uuid, optional) - Filter by client
- `contractor_id` (uuid, optional) - Filter by contractor

**Response:** `200 OK`
```json
{
  "invitations": [...],
  "total": 100,
  "page": 1,
  "page_size": 50,
  "total_pages": 2
}
```

---

### 3. Get Invitation
**GET** `/api/v1/invitations/{invitation_id}`

Get a specific invitation by ID.

**Authorization:** Required

**Response:** `200 OK`
```json
{
  "id": "uuid",
  "email": "john@example.com",
  ...
}
```

---

### 4. Resend Invitation
**POST** `/api/v1/invitations/{invitation_id}/resend`

Resend invitation notification.

**Authorization:** Required

**Request Body:**
```json
{
  "invitation_method": "email"
}
```

**Response:** `200 OK`
```json
{
  "id": "uuid",
  "email": "john@example.com",
  ...
}
```

---

### 5. Cancel Invitation
**DELETE** `/api/v1/invitations/{invitation_id}`

Cancel a pending invitation.

**Authorization:** Required

**Response:** `204 No Content`

---

## Public Endpoints (No Authentication)

### 6. Validate Invitation Token
**POST** `/api/v1/invitations/validate`

Validate an invitation token before showing registration form.

**Authorization:** None (Public)

**Request Body:**
```json
{
  "token": "secure_random_token"
}
```

**Response:** `200 OK`
```json
{
  "id": "uuid",
  "email": "john@example.com",
  "invited_role": "field_agent",
  "status": "pending",
  "expires_at": "2025-11-19T10:00:00Z",
  "organization_name": "TechInstall Ltd",
  "organization_type": "contractor",
  "is_expired": false,
  "is_valid": true
}
```

**Error Response:** `400 Bad Request`
```json
{
  "detail": "Invalid or expired invitation token"
}
```

---

### 7. Accept Invitation
**POST** `/api/v1/invitations/accept`

Accept invitation and create user account.

**Authorization:** None (Public)

**Request Body:**
```json
{
  "token": "secure_random_token",
  "first_name": "John",
  "last_name": "Doe",
  "password": "SecurePass123!",
  "phone": "+254712345678"
}
```

**Response:** `200 OK`
```json
{
  "access_token": "jwt_token_here",
  "token_type": "bearer",
  "user": {
    "id": "uuid",
    "email": "john@example.com",
    "first_name": "John",
    "last_name": "Doe",
    "full_name": "John Doe",
    "role": "field_agent",
    "is_active": true
  }
}
```

---

## Authorization Rules

| Role | Can Invite To | Can View | Can Resend | Can Cancel |
|------|---------------|----------|------------|------------|
| `platform_admin` | Any organization | All invitations | All invitations | All invitations |
| `client_admin` | Their client only | Their client's invitations | Their client's invitations | Their client's invitations |
| `contractor_admin` | Their contractor only | Their contractor's invitations | Their contractor's invitations | Their contractor's invitations |
| Other roles | Cannot invite | Invitations they created | Invitations they created | Invitations they created |

---

## Invitation Flow

```
1. Admin creates invitation
   POST /api/v1/invitations
   ↓
2. System sends WhatsApp/Email with link
   https://swiftops.atomio.tech/accept-invitation?token=xxx
   ↓
3. User clicks link, frontend validates token
   POST /api/v1/invitations/validate
   ↓
4. Frontend shows registration form
   ↓
5. User fills form and submits
   POST /api/v1/invitations/accept
   ↓
6. Backend creates Supabase user + local profile
   ↓
7. User is logged in automatically
```

---

## Error Codes

| Code | Description |
|------|-------------|
| 400 | Invalid request data or expired token |
| 401 | Authentication required |
| 403 | Insufficient permissions |
| 404 | Invitation not found |
| 500 | Server error |

---

## Notification Delivery

### Default Behavior
1. Try WhatsApp first (saves email credits)
2. If WhatsApp fails → Automatically fallback to Email
3. Track delivery status for both methods

### Method Options
- `whatsapp` - Try WhatsApp, fallback to Email if fails
- `email` - Send via Email only
- `both` - Send via both WhatsApp AND Email

---

## Testing with cURL

### Create Invitation
```bash
curl -X POST "http://localhost:8000/api/v1/invitations" \
  -H "Authorization: Bearer YOUR_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "email": "john@example.com",
    "phone": "+254712345678",
    "role": "field_agent",
    "contractor_id": "uuid",
    "invitation_method": "whatsapp"
  }'
```

### Validate Token (Public)
```bash
curl -X POST "http://localhost:8000/api/v1/invitations/validate" \
  -H "Content-Type: application/json" \
  -d '{
    "token": "secure_random_token"
  }'
```

### Accept Invitation (Public)
```bash
curl -X POST "http://localhost:8000/api/v1/invitations/accept" \
  -H "Content-Type: application/json" \
  -d '{
    "token": "secure_random_token",
    "first_name": "John",
    "last_name": "Doe",
    "password": "SecurePass123!",
    "phone": "+254712345678"
  }'
```

---

## Frontend Integration

### Step 1: User receives invitation
Email/WhatsApp contains link: `https://swiftops.atomio.tech/accept-invitation?token=xxx`

### Step 2: Validate token
```typescript
const response = await fetch('/api/v1/invitations/validate', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ token })
});

const invitation = await response.json();
// Show registration form with pre-filled email
```

### Step 3: Accept invitation
```typescript
const response = await fetch('/api/v1/invitations/accept', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    token,
    first_name,
    last_name,
    password,
    phone
  })
});

const { access_token, user } = await response.json();
// Store token and redirect to dashboard
```

---

## Database Migrations

Run these migrations in order:
1. `supabase/migrations/11_user_invitations.sql` - Creates table and enums
2. `supabase/migrations/12_user_invitations_rls.sql` - Enables RLS and policies

---

## Environment Variables Required

```env
APP_DOMAIN=swiftops.atomio.tech
APP_PROTOCOL=https
INVITATION_TOKEN_EXPIRY_HOURS=72
RESEND_API_KEY=re_xxx
RESEND_FROM_EMAIL=swiftops@atomio.tech
WASENDER_API_KEY=xxx
WASENDER_PHONE_NUMBER=+254xxx
WASENDER_API_URL=https://api.wasender.com/v1
```