InvoicePilot

// shared-types/src/canonical.ts — the backend-agnostic seal core.
// recordHash = '0x' + sha256( domainTag + '\n' + canonicalJSON(payload) )
export function computeRecordHash(
  payload: unknown,
  domainTag: string,
): `0x${string}` {
  return `0x${sha256Hex(domainTag + '\n' + canonicalJSON(payload))}`;
}

// AI emits { value: 0.0, present: false } for fields it never found.
// A mapper checking only typeof value === 'number' writes amount 0,
// marks the invoice approvable — then it gets SEALED ON-CHAIN.
// So every key is OMITTED unless the extractor produced it:
export interface ExtractedInvoiceFields {
  vendorName?: string;       // nfc'd, varchar(255)
  invoiceNumber?: string;    // nfc'd, varchar(128)
  amount?: string;           // fixed-4 decimal, numeric(19,4)
  currency?: string;         // /^[A-Z]{3}$/
  lineItems?: NormalizedLineItem[]; // jsonb, sealed as-stored
}

// seal.ts — the only tx this worker ever pays for.
const [block, suggestedTip] = await Promise.all([
  publicClient.getBlock(),
  publicClient.estimateMaxPriorityFeePerGas(),
]);
const fees = computeSealFees({
  baseFeePerGas: block.baseFeePerGas,
  suggestedPriorityFeePerGas: suggestedTip,
  maxPriorityFeeWei: config.maxPriorityFeeWei,
  baseFeeMultiplier: config.baseFeeMultiplier,
  maxFeeCapWei: config.maxFeeCapWei,
});
if (fees.maxFeePerGas > config.maxFeeCapWei) {
  throw new Error('seal: chain is expensive — not submitting, retry later');
}
const txHash = await walletClient.writeContract({
  address: SEAL_CONTRACT_ADDRESS, abi: sealRegistryAbi,
  functionName: 'sealRecord',
  args: [recordHash, RECORD_TYPE_APPROVAL],
  maxFeePerGas: fees.maxFeePerGas,
  maxPriorityFeePerGas: fees.maxPriorityFeePerGas,
});