Swap on BDEX V3

import { createPublicClient, createWalletClient, erc20Abi, formatUnits, http, parseEther, zeroAddress } from "viem";
import { privateKeyToAccount } from "viem/accounts";
import { botChainTestnet } from "@uzolabs/sdk/chains";
import { bdexV3FactoryAbi, bdexV3QuoterV2Abi, bdexV3SwapRouterAbi, getAddresses } from "@uzolabs/sdk/contracts";

const account = privateKeyToAccount(process.env.BOT_PRIVATE_KEY as `0x${string}`);
const publicClient = createPublicClient({ chain: botChainTestnet, transport: http() });
const walletClient = createWalletClient({ account, chain: botChainTestnet, transport: http() });
const { wbot, usdt, bdexV3Factory, bdexV3QuoterV2, bdexV3SwapRouter } = getAddresses(botChainTestnet.id);
const explorer = botChainTestnet.blockExplorers.default.url;

const amountIn = parseEther("0.0005"); // 0.0005 tBOT, sent as native value
const slippageBps = 50n; // 0.5%

// 1. Find the pool with the best quote. A zero address means no pool for that fee tier.
let best: { fee: number; amountOut: bigint } | undefined;
for (const fee of [500, 3000, 10000]) {
  const pool = await publicClient.readContract({ address: bdexV3Factory, abi: bdexV3FactoryAbi, functionName: "getPool", args: [wbot, usdt, fee] });
  if (pool === zeroAddress) continue;

  // QuoterV2 is not a view function, so simulate it instead of reading it.
  try {
    const { result } = await publicClient.simulateContract({
      address: bdexV3QuoterV2,
      abi: bdexV3QuoterV2Abi,
      functionName: "quoteExactInputSingle",
      args: [{ tokenIn: wbot, tokenOut: usdt, amountIn, fee, sqrtPriceLimitX96: 0n }],
    });
    const [amountOut] = result;
    console.log(`Fee ${fee}: pool ${pool}, quote ${formatUnits(amountOut, 6)} USDT`);
    if (!best || amountOut > best.amountOut) best = { fee, amountOut };
  } catch {
    console.log(`Fee ${fee}: pool ${pool}, no quote (no liquidity in range)`);
  }
}
if (!best) throw new Error("No WBOT/USDT pool with liquidity");

// 2. Swap through SwapRouter. Sending value makes the router wrap tBOT for you.
const amountOutMinimum = (best.amountOut * (10_000n - slippageBps)) / 10_000n;
const deadline = BigInt(Math.floor(Date.now() / 1000) + 20 * 60);
const { request } = await publicClient.simulateContract({
  account,
  address: bdexV3SwapRouter,
  abi: bdexV3SwapRouterAbi,
  functionName: "exactInputSingle",
  args: [{
    tokenIn: wbot,
    tokenOut: usdt,
    fee: best.fee,
    recipient: account.address,
    deadline,
    amountIn,
    amountOutMinimum,
    sqrtPriceLimitX96: 0n,
  }],
  value: amountIn,
});
const hash = await walletClient.writeContract(request);
const receipt = await publicClient.waitForTransactionReceipt({ hash });
console.log(`Swap ${receipt.status} on fee tier ${best.fee}: ${explorer}/tx/${hash}`);

const usdtBalance = await publicClient.readContract({ address: usdt, abi: erc20Abi, functionName: "balanceOf", args: [account.address] });
console.log(`USDT balance: ${formatUnits(usdtBalance, 6)}`);