# Google Calendar Integration with Supabase Edge Functions

This guide walks you through setting up Google Calendar integration directly in Supabase Edge Functions, without needing n8n or OAuth.

## Architecture

```
Access Hub App → Supabase Edge Function → Google Calendar API
                      ↓
                 JWT Authentication
                      ↓
              Service Account JSON
```

## Setup Steps

### 1. Create Google Service Account

1. Go to [Google Cloud Console](https://console.cloud.google.com/)
2. Create a new project or select existing one
3. Navigate to **IAM & Admin** → **Service Accounts**
4. Click **Create Service Account**
5. Fill in details:
   - Name: `access-hub-calendar`
   - Description: `Service account for Access Hub calendar integration`
6. Click **Create and Continue** (skip granting roles)
7. Click **Done**

### 2. Enable Google Calendar API

1. In Google Cloud Console, go to **APIs & Services** → **Library**
2. Search for "Google Calendar API"
3. Click **Enable**

### 3. Create Service Account Key

1. Go to your service account page
2. Click the **Keys** tab
3. Click **Add Key** → **Create New Key**
4. Select **JSON** format
5. Click **Create** - download the JSON file

Keep this file secure! It contains your private key.

### 4. Share Calendar with Service Account

1. Go to [Google Calendar](https://calendar.google.com/)
2. Hover over the calendar you want to use
3. Click the **three dots (⋮)** → **Settings and sharing**
4. Scroll to **Share with specific people**
5. Click **+ Add people**
6. Enter the service account email from your JSON: `xxx@xxx.iam.gserviceaccount.com`
7. Set permissions to **Make changes to events**
8. Click **Send**

### 5. Add Database Column

Run this SQL in your Supabase SQL Editor:

```sql
ALTER TABLE platform_settings
ADD COLUMN IF NOT EXISTS google_service_account_json TEXT;
```

### 6. Deploy Edge Function

```bash
# Deploy the new function
supabase functions deploy create-google-meet-event --verify-jwt
```

Or use the deployment script:
```bash
./deploy-edge-functions.sh
```

### 7. Configure in Admin Panel

1. Go to **Settings** → **Integrasi**
2. Find the **Google Calendar** section
3. Enter your **Calendar ID** (e.g., `your-email@gmail.com`)
4. Paste the **Service Account JSON** (entire content from the JSON file)
5. Click **Simpan Semua Pengaturan**
6. Click **Test Google Calendar Connection**

If successful, you'll see a test event created in your Google Calendar with a Google Meet link.

## How It Works

### Authentication Flow

1. Edge Function reads service account JSON
2. Creates a JWT signed with the private key
3. Exchanges JWT for an access token
4. Uses access token to call Google Calendar API

### Event Creation

When a consultation slot is confirmed:

1. `create-google-meet-event` function is called
2. Creates a Google Calendar event with Meet link
3. Returns the Meet link to be stored in the database

## API Reference

### Request

```typescript
POST /functions/v1/create-google-meet-event

{
  slot_id: string;          // Unique slot identifier
  date: string;             // YYYY-MM-DD
  start_time: string;       // HH:MM:SS
  end_time: string;         // HH:MM:SS
  client_name: string;      // Client's full name
  client_email: string;     // Client's email
  topic: string;            // Consultation topic
  notes?: string;           // Optional notes
}
```

### Response

```typescript
{
  success: true;
  meet_link: string;        // https://meet.google.com/xxx-xxx-xxx
  event_id: string;         // Google Calendar event ID
  html_link: string;        // Link to event in Google Calendar
}
```

## Testing

### Test via Admin Panel

Use the **Test Google Calendar Connection** button in the Integrasi settings.

### Test via Curl

```bash
curl -X POST https://your-project.supabase.co/functions/v1/create-google-meet-event \
  -H "Authorization: Bearer YOUR_ANON_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "slot_id": "test-123",
    "date": "2025-12-25",
    "start_time": "14:00:00",
    "end_time": "15:00:00",
    "client_name": "Test Client",
    "client_email": "test@example.com",
    "topic": "Test Topic"
  }'
```

## Security Notes

1. **Never commit** the service account JSON to version control
2. **Store securely** in database (consider encryption for production)
3. **Rotate keys** if compromised
4. **Limit permissions** to only Calendar API
5. **Use separate service accounts** for different environments

## Troubleshooting

### Error: "Google Service Account JSON belum dikonfigurasi"
- Make sure you've saved the JSON in the admin settings
- Check the database column exists: `google_service_account_json`

### Error: 403 Forbidden
- Verify calendar is shared with service account email
- Check service account has "Make changes to events" permission

### Error: 401 Unauthorized
- Verify service account JSON is valid
- Check Calendar API is enabled in Google Cloud Console

### Error: "Failed to parse service account JSON"
- Make sure you pasted the entire JSON content
- Check for any truncation or formatting issues

### Error: "Gagal membuat event di Google Calendar"
- Check the error message for details
- Verify Calendar API is enabled
- Check service account has correct permissions

## Comparison: n8n vs Edge Function

| Feature | n8n Integration | Edge Function |
|---------|----------------|---------------|
| Setup Complexity | Medium | Low |
| OAuth Required | No (Service Account) | No (Service Account) |
| External Dependencies | n8n instance | None |
| Cost | Requires n8n hosting | Included in Supabase |
| Maintenance | n8n updates | Supabase updates |
| Performance | Extra hop | Direct API call |
| **Recommended** | For complex workflows | ✅ **For simple integrations** |

## Next Steps

1. ✅ Create service account
2. ✅ Share calendar with service account
3. ✅ Run database migration
4. ✅ Deploy edge function
5. ✅ Configure in admin panel
6. ✅ Test connection
7. ✅ Integrate with consultation booking flow

## Files Modified/Created

- `supabase/functions/create-google-meet-event/index.ts` - New edge function
- `supabase/migrations/20250323_add_google_service_account.sql` - Database migration
- `src/components/admin/settings/IntegrasiTab.tsx` - Admin UI for configuration

---

**Need Help?** Check the Supabase Edge Functions logs in your dashboard for detailed error messages.