import { sha3_256 } from "@noble/hashes/sha3";
import { UserTransactionResponse } from "../types";
import { Serializer } from "../bcs";
import { AccountAddress } from "../core";

export function getPaymentChecksum(simulateResult: UserTransactionResponse): Uint8Array {
  const { sender, events } = simulateResult;
  const withdrawEvents = events.filter((evt) => (
    evt.type === "0x1::fungible_asset::Withdraw"
    && evt.data.owner === sender
  )).map((evt) => {
    const { amount, store } = evt.data;
    const serializer = new Serializer(32 + 16);
    AccountAddress.from(store).serialize(serializer);
    serializer.serializeU128(BigInt(amount));
    return serializer.toUint8Array();
  });
  const serializer = new Serializer();
  serializer.serializeU32AsUleb128(withdrawEvents.length);
  withdrawEvents.forEach((withdrawEvent) => serializer.serializeFixedBytes(withdrawEvent));
  return sha3_256(serializer.toUint8Array());
}