import { Account, Call, Contract } from 'starknet';
import { ERC20_ABI } from '../abis/erc20Abi.js';
import { Router } from 'fibrous-router-sdk';
import { BigNumber } from '@ethersproject/bignumber';
export class ApprovalService {
private fibrous: Router;
constructor() {
this.fibrous = new Router();
}
async checkAndGetApproveToken(
account: Account,
tokenAddress: string,
spenderAddress: string,
amount: string
): Promise<Call | null> {
try {
const contract = new Contract(ERC20_ABI, tokenAddress, account);
const allowanceResult = await contract.allowance(
account.address,
spenderAddress
);
let currentAllowance: bigint;
if (Array.isArray(allowanceResult)) {
currentAllowance = BigInt(allowanceResult[0].toString());
} else if (
typeof allowanceResult === 'object' &&
allowanceResult !== null
) {
const value: any = Object.values(allowanceResult)[0];
currentAllowance = BigInt(value.toString());
} else {
currentAllowance = BigInt(allowanceResult.toString());
}
const requiredAmount = BigInt(amount);
if (currentAllowance < requiredAmount) {
const calldata = await this.fibrous.buildApproveStarknet(
BigNumber.from(amount),
tokenAddress
);
return calldata;
} else {
return null;
}
} catch (error) {
throw new Error(
`Failed to approve token: ${error instanceof Error ? error.message : 'Unknown error'}`
);
}
}
}
