Added tuumservice

packages/snap/src/utils/tuumService.ts

@@ -0,0 +1,57 @@
+import BigNumber from 'bignumber.js';
+import {
+  AccountBalance,
+  SimpleHederaClient,
+  SimpleTransfer,
+} from 'src/services/hedera';
+import { TUUMACCOUNTID } from '../types/constants';
+
+export type QueryCost = {
+  serviceFee: number;
+  estimatedCost: number;
+  maxCost: number;
+};
+
+export const calculateHederaQueryFees = (queryCost: BigNumber): QueryCost => {
+  const serviceFee = queryCost.multipliedBy(0.01); // 1% service fee to Tuum Tech for the query; This can be changed in the future
+
+  const estimatedCost = queryCost.plus(serviceFee);
+
+  // add a 5% margin to allow for spot fluctuations
+  const maxCost = estimatedCost.multipliedBy(1.05);
+
+  const serviceFeeResult = Number(serviceFee.toFixed(8));
+  const estimatedCostResult = Number(estimatedCost.toFixed(8));
+  const maxCostResult = Number(maxCost.toFixed(8));
+
+  return {
+    serviceFee: serviceFeeResult,
+    estimatedCost: estimatedCostResult,
+    maxCost: maxCostResult,
+  } as QueryCost;
+};
+
+export const deductServiceFee = async (
+  currentBalance: AccountBalance,
+  serviceFee: number,
+  hederaClient: SimpleHederaClient,
+) => {
+  try {
+    const transfers: SimpleTransfer[] = [
+      {
+        asset: 'HBAR',
+        to: TUUMACCOUNTID,
+        amount: serviceFee,
+      } as SimpleTransfer,
+    ];
+    await hederaClient.transferCrypto({
+      currentBalance,
+      transfers,
+      memo: null,
+      maxFee: null,
+      serviceFees: null,
+    });
+  } catch (error: any) {
+    // eslint-disable-next-line no-empty
+  }
+};