/**
 * Step 2 — Device app lib (JS bindings)
 * For EVM/Chain 138 we use existing @ledgerhq/hw-app-eth. No new package needed.
 * Ensure chainId 138 is passed when building/signing transactions.
 *
 * Example usage in coin-module or live-common (signer/bridge):
 */

import Eth from "@ledgerhq/hw-app-eth";

const CHAIN_ID_138 = 138;

// When getting address (path is BIP44 EVM: 44'/60'/0'/0/0)
async function getAddress(
  transport: { send: (cla: number, ins: number, p1: number, p2: number, data?: Buffer) => Promise<Buffer> },
  path: string,
  display?: boolean
) {
  const eth = new Eth(transport);
  const result = await eth.getAddress(path, display ?? false);
  return { address: result.address, publicKey: result.publicKey, path };
}

// When signing a transaction, the serialized tx must include chainId 138 (EIP-155)
// so the device shows "Defi Oracle Meta" and signs correctly.
function buildTxWithChainId(tx: { chainId?: number; [k: string]: unknown }) {
  return { ...tx, chainId: tx.chainId ?? CHAIN_ID_138 };
}

export { getAddress, buildTxWithChainId, CHAIN_ID_138 };