import { z } from 'zod';
import { VelrimClient, type DocumentInput } from '@velrim/sdk';

// Replace this illustrative legacy contract with your application's exact model.
const Invoice = z.object({
	invoice_number: z.string(),
	total: z.number(),
	currency: z.enum(['USD', 'EUR']),
	po_number: z.string().nullable().optional(),
});

export async function extractForExistingApp(client: VelrimClient, document: DocumentInput) {
	const result = await client.extract(Invoice, document);
	return {
		// Existing consumers can read invoice; review code retains the evidence.
		invoice: result.data,
		evidence: { fields: result.fields, meta: result.meta },
	};
}