import { EInvoice } from '@elyonar/einvoice-js';

// Minimal setup - environment auto-detected from API key
const client = new EInvoice({ apiKey: 'sk_test_...' });

// Create an invoice
const invoice = await client.invoices.create({
  sellerId: 'sel_123',
  buyerId: 'buy_456',
  invoiceDate: '2026-03-20',
  dueDate: '2026-04-20',
  currency: 'NGN',
  lineItems: [
    { description: 'Consulting services', quantity: 10, unitPrice: 50000, vatRate: 7.5 },
  ],
});

// Submit to tax authority
const result = await client.invoices.submit(invoice.data.id);
console.log(result.data.jobId); // 'job_abc123'

// That's it! Environment auto-detected from API key
const client = new EInvoice({ apiKey: 'sk_test_...' });

const client = new EInvoice({
  apiKey: 'sk_live_...',
  options: {
    baseUrl: 'https://custom-region.api.einvoice.ng',  // Override auto-detection
    timeout: 60000,                                     // 60s for slow networks
  },
});

// CRUD
client.invoices.create(params)        // Create a draft invoice
client.invoices.get(id)               // Get invoice by ID
client.invoices.list(params?)         // List with filters (status, date range, etc.)
client.invoices.update(id, params)    // Update a draft invoice
client.invoices.delete(id)            // Delete a draft invoice

// Submission
client.invoices.submit(id)            // Submit to tax authority (irreversible)
client.invoices.batchSubmit(ids)      // Batch submit 1–100 invoices
client.invoices.retry(id)             // Retry a failed submission
client.invoices.cancel(id, params)    // Cancel an accepted invoice

// Status & Validation
client.invoices.getStatus(id)         // Get status from local DB
client.invoices.queryStatus(id)       // Query tax authority for real-time status
client.invoices.validate(params)      // Validate without creating
client.invoices.download(id, format?) // Get PDF/XML download URL

// Analytics
client.invoices.getStatistics(params?) // Invoice analytics
client.invoices.getSetup()             // Reference data for creation

client.sellers.create(params)              // Register a seller
client.sellers.get(id)                     // Get seller by ID
client.sellers.list(params?)               // List sellers
client.sellers.update(id, params)          // Update seller (TIN is immutable)
client.sellers.delete(id)                  // Delete seller (no invoices)
client.sellers.verifyTin(id)               // Trigger TIN verification
client.sellers.getVerificationStatus(id)   // Check verification status
client.sellers.search(query)               // Search by name or TIN

client.buyers.create(params)              // Register a buyer
client.buyers.get(id)                     // Get buyer by ID
client.buyers.list(params?)               // List buyers
client.buyers.update(id, params)          // Update buyer (TIN is immutable)
client.buyers.delete(id)                  // Delete buyer (no invoices)
client.buyers.verifyTin(id)               // Trigger TIN verification
client.buyers.getVerificationStatus(id)   // Check verification status
client.buyers.search(query)               // Search by name or TIN

// Account
client.billing.getAccount()                // Credit balance & status
client.billing.checkBalance(credits)       // Verify sufficient credits
client.billing.getSetup()                  // Full billing overview

// Plans & Packages
client.billing.getPlans(params?)           // Available subscription plans
client.billing.getPackages(params?)        // Available credit packages

// Subscriptions
client.billing.getActiveSubscription()     // Current subscription
client.billing.getSubscriptionHistory()    // Past subscriptions

// Payments & Credits
client.billing.purchaseCredits(params)     // Buy credits (returns checkout URL)
client.billing.getPayments(params?)        // Payment history
client.billing.getTransactions(params?)    // Credit transaction history

// Analytics
client.billing.getUsageAnalytics(params?)  // Submissions, credits, daily breakdown
client.billing.getConsumptionBreakdown()   // Credits by API endpoint

import { verifyWebhook } from '@elyonar/einvoice-js/webhooks';

// Express example
app.post('/webhooks/einvoice', (req, res) => {
  try {
    const event = verifyWebhook(req.body, req.headers, process.env.WEBHOOK_SECRET);

    switch (event.eventType) {
      case 'invoice.approved':
        console.log('Invoice approved:', event.data);
        break;
      case 'billing.low_credit_alert':
        console.log('Low credits!', event.data);
        break;
    }

    res.sendStatus(200);
  } catch (err) {
    console.error('Webhook verification failed:', err);
    res.sendStatus(400);
  }
});

import { EInvoiceApiError, EInvoiceRateLimitError } from '@elyonar/einvoice-js';

try {
  await client.invoices.submit('inv_123');
} catch (err) {
  if (err instanceof EInvoiceRateLimitError) {
    console.log(`Rate limited. Retry after ${err.retryAfter}s`);
  } else if (err instanceof EInvoiceApiError) {
    console.log(err.statusCode);  // 422
    console.log(err.errorCode);   // 'INVALID_STATE_TRANSITION'
    console.log(err.errors);      // [{ field: 'status', message: '...' }]
  }
}

const controller = new AbortController();

await client.invoices.list({ status: 'draft' }, {
  timeout: 5000,               // Override timeout for this request
  signal: controller.signal,   // AbortSignal for cancellation
  headers: { 'X-Request-Id': 'req_123' }, // Additional headers
});