const ethers = require('ethers');
const BigNumber = require('big-number');
const { computePoolAddress } = require('@uniswap/v3-sdk');
const { Token } = require('@uniswap/sdk-core');

// Ethereum network configuration
const provider = new ethers.JsonRpcProvider('http://127.0.0.1:8545/');

const privateKey = 'ac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80';

// Uniswap V3 contract configuration
const uniswapV3SwapRouterAddress = '0xE592427A0AEce92De3Edee1F18E0157C05861564';
const PoolFactoryContractAddress = '0x1F98431c8aD98523631AE4a59f267346ea31F984';
const quoterContractAddress = '0xb27308f9F90D607463bb33eA1BeBb41C27CE5AB6';
const uniswapV3SwapRouterABI = require('@uniswap/v3-periphery/artifacts/contracts/SwapRouter.sol/SwapRouter.json').abi;
const uniswapV3PoolABI = require('@uniswap/v3-core/artifacts/contracts/interfaces/IUniswapV3Pool.sol/IUniswapV3Pool.json').abi;
const uniswapV3QuoterAbi = require('@uniswap/v3-periphery/artifacts/contracts/lens/Quoter.sol/Quoter.json').abi;

// Token configuration
const tokenToSwapAddress = '0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2';
const tokenToReceiveAddress = '0x0cEC1A9154Ff802e7934Fc916Ed7Ca50bDE6844e';

const wallet = new ethers.Wallet(privateKey, provider);

// Load the Uniswap V3 contract
const uniswapV3SwapRouterContract = new ethers.Contract(uniswapV3SwapRouterAddress, uniswapV3SwapRouterABI, wallet);
const customGasPrice = ethers.parseUnits('50', 'gwei');

async function estimateGas(txObj) {
  const gasLimit = await provider.estimateGas({ ...txObj, from: wallet.address }); // Add from field
  const estimatedGasPrice = ethers.parseUnits('50', 'gwei');
  // Convert gasLimit and estimatedGasPrice to BigNumber and multiply
  const totalGas = BigNumber(gasLimit.toString()).multiply(estimatedGasPrice.toString());
  return ethers.formatEther(totalGas.toString());
}

async function executeTrade() {
  try {
    const tokenToSwapProperties = await getTokenProperties(tokenToSwapAddress);
    const tokenToReceiveProperties = await getTokenProperties(tokenToReceiveAddress);
    const tokenToSwap = new Token(1, tokenToSwapAddress, Number(tokenToSwapProperties.decimals), tokenToSwapProperties.symbol, tokenToSwapProperties.name);
    const tokenToReceive = new Token(1, tokenToReceiveAddress, Number(tokenToReceiveProperties.decimals), tokenToReceiveProperties.symbol, tokenToReceiveProperties.name);
    const tokenToSwapAmount = ethers.parseUnits('1', tokenToSwapProperties.decimals);

    console.log('Token to Swap Properties:', tokenToSwapProperties);
    console.log('Token to Receive Properties:', tokenToReceiveProperties);
    console.log('Token to Swap Amount:', tokenToSwapAmount.toString());

    const currentPoolAddress = computePoolAddress({
      factoryAddress: PoolFactoryContractAddress,
      tokenA: tokenToSwap, // Use the Token instance
      tokenB: tokenToReceive, // Use the Token instance
      fee: 3000,
    });

    const poolContract = new ethers.Contract(currentPoolAddress, uniswapV3PoolABI, provider);

    const [token0, token1, fee] = await Promise.all([poolContract.token0(), poolContract.token1(), poolContract.fee()]);

    const quoterContract = new ethers.Contract(quoterContractAddress, uniswapV3QuoterAbi, provider);

    const data = quoterContract.interface.encodeFunctionData('quoteExactInputSingle', [token0, token1, fee, tokenToSwapAmount.toString(), 0]);

    const txObject = {
      to: quoterContractAddress,
      data: data,
    };
    const quotedAmountOut = await provider.call(txObject);
    const humanReadableAmountOut = ethers.formatUnits(quotedAmountOut, tokenToReceiveProperties.decimals);
    console.log('Estimated amount out:', humanReadableAmountOut, tokenToReceiveProperties.name);

    const estimatedGasFee = await estimateGas(txObject);
    console.log('Estimated gas fee:', estimatedGasFee, 'ETH');

    // Approve Uniswap V3 SwapRouter to spend tokenToSwap
    console.log('Approving token spend by SwapRouter…');
    const tokenToSwapContract = new ethers.Contract(tokenToSwapAddress, ['function approve(address spender, uint256 amount) external returns (bool)'], wallet);
    const approvalTx = await tokenToSwapContract.approve(uniswapV3SwapRouterAddress, tokenToSwapAmount, { gasPrice: customGasPrice, gasLimit: 25000000 });

    await approvalTx.wait();
    console.log('Token spend approval transaction confirmed.');

    const swapParams = {
      tokenIn: tokenToSwapAddress,
      tokenOut: tokenToReceiveAddress,
      fee: 3000,
      recipient: wallet.address,
      deadline: Math.floor(Date.now() / 1000) + 60 * 20,
      amountIn: tokenToSwapAmount,
      amountOutMinimum: 0,
      sqrtPriceLimitX96: 0,
    };

    console.log('Sending swap transaction…');
    const swapTx = await uniswapV3SwapRouterContract.exactInputSingle(swapParams, { gasPrice: customGasPrice, gasLimit: 25000000 });

    console.log('Swap transaction hash:', swapTx.hash);

    // Wait for transaction confirmation
    console.log('Waiting for swap transaction confirmation…');
    await swapTx.wait();
    console.log('Swap transaction confirmed!');
  } catch (e) {
    console.log(e);
  }
}

executeTrade();

async function getTokenProperties(tokenAddress) {
  const erc20ABI = ['function name() view returns (string)', 'function symbol() view returns (string)', 'function decimals() view returns (uint8)'];
  const tokenContract = new ethers.Contract(tokenAddress, erc20ABI, provider);
  const [name, symbol, decimals] = await Promise.all([tokenContract.name(), tokenContract.symbol(), tokenContract.decimals()]);
  return {
    name,
    symbol,
    decimals,
  };
}
 explain gaslimit and fee