import { roundRobinRandomImprove, defaultSelectionConstraints, InputSelector, SelectionResult, SelectionSkeleton } from '@cardano-sdk/cip2';
import { loadCardanoSerializationLib, CSL, CardanoSerializationLib, ProtocolParametersRequiredByWallet } from '@cardano-sdk/core';

const demo = async (protocolParameters: ProtocolParametersRequiredByWallet): Promise<SelectionResult> => {
  const csl: CardanoSerializationLib = await loadCardanoSerializationLib();
  const selector: InputSelector = roundRobinRandomImprove(coinsPerUtxoWord);
  // It is important that you use the same instance of cardano-serialization-lib across your application.
  // Bad: TransactionUnspentOutput.new(...)
  // Good: CSL.TransactionUnspentOutput.new(...)
  const utxo: CSL.TransactionUnspentOutput[] = [CSL.TransactionUnspentOutput.new(...), ...];
  const outputs: CSL.TransactionOutput[] = [CSL.TransactionOutput.new(...), ...];
  // Used to estimate min fee and validate transaction size
  const buildTx = (inputSelection: SelectionSkeleton): Promise<CSL.Transaction> => {...};
  const constraints = defaultSelectionConstraints({
    protocolParameters, buildTx,
  });

  return selector.select({
    utxo,
    outputs,
    constraints,
  });
};