// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract Valhallau { 
    IUniswapV2Router02 public immutable swapRouter;
    IERC20 public constant SHIB =
        IERC20(0x6f8a06447Ff6FcF75d803135a7de15CE88C1d4ec);
    IERC20 public constant USDT =
        IERC20(0xc2132D05D31c914a87C6611C10748AEb04B58e8F);
    uint24 public constant poolFee = 5000; // 0.05%

    // quickswap router 0xa5E0829CaCEd8fFDD4De3c43696c57F7D7A678ff

    constructor(IUniswapV2Router02 _swapRouter) {
        swapRouter = _swapRouter;
    }

    function swap(uint256 amountIn) public returns (uint[] memory amounts) {
        require(
            USDT.transferFrom(msg.sender, address(this), amountIn),
            "TransferFrom failed."
        );
        require(USDT.approve(address(swapRouter), amountIn), "Approve failed.");

        address[] memory path = new address[](2);
        path[0] = address(USDT);
        path[1] = address(SHIB);

        amounts = swapRouter.swapExactTokensForTokens(
            amountIn,
            0,
            path,
            address(this),
            block.timestamp
        );
        return amounts;
    }
}