I Regret Nothing

//SPDX-License-Identifier: UNLICENSED
/**

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╚═▀▀▀══╝╚═╝╚═╝  ╚═╝╚═╝  ╚═══╝

I Regret Nothing | $IRN 

Website: https://irn.lol/
TG: https://t.me/IRNcoin
X: https://x.com/IRNcoin
**/

pragma solidity 0.8.7;

interface IOwnable {
    function owner() external view returns (address);
}

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address who) external view returns (uint256);
    function allowance(address _owner, address spender) external view returns (uint256);
    function transfer(address to, uint256 value) external returns (bool);
    function approve(address spender, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

abstract contract BaseErc20 is IERC20, IOwnable {
    mapping (address => uint256) internal _balances;
    mapping (address => mapping (address => uint256)) internal _allowed;
    uint256 internal _totalSupply;
    
    string public symbol;
    string public name;
    uint8 public decimals;
    
    address public override owner;
    bool public launched;
    
    mapping (address => bool) internal exchanges;

    modifier onlyOwner() {
        require(msg.sender == owner, "can only be called by the contract owner");
        _;
    }
    
    modifier isLaunched() {
        require(launched, "can only be called once token is launched");
        _;
    }

    // @dev Trading is allowed before launch if the sender is the owner, we are transferring from the owner, or in canAlwaysTrade list
    modifier tradingEnabled(address from) virtual {
        require(launched || from == owner, "trading not enabled");
        _;
    }
    
    constructor(address _owner) {
        owner = _owner;
    }

    /**
    * @dev Total number of tokens in existence
    */
    function totalSupply() external override view returns (uint256) {
        return _totalSupply;
    }

    /**
    * @dev Gets the balance of the specified address.
    * @param _owner The address to query the balance of.
    * @return An uint256 representing the amount owned by the passed address.
    */
    function balanceOf(address _owner) external override view returns (uint256) {
        return _balances[_owner];
    }

    /**
     * @dev Function to check the amount of tokens that an owner allowed to a spender.
     * @param _owner address The address which owns the funds.
     * @param spender address The address which will spend the funds.
     * @return A uint256 specifying the amount of tokens still available for the spender.
     */
    function allowance(address _owner, address spender) external override view returns (uint256) {
        return _allowed[_owner][spender];
    }

    /**
    * @dev Transfer token for a specified address
    * @param to The address to transfer to.
    * @param value The amount to be transferred.
    */
    function transfer(address to, uint256 value) external override tradingEnabled(msg.sender) returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    /**
     * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
     * Beware that changing an allowance with this method brings the risk that someone may use both the old
     * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
     * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     */
    function approve(address spender, uint256 value) external override tradingEnabled(msg.sender) returns (bool) {
        require(spender != address(0), "cannot approve the 0 address");

        _allowed[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }

    /**
     * @dev Transfer tokens from one address to another.
     * Note that while this function emits an Approval event, this is not required as per the specification,
     * and other compliant implementations may not emit the event.
     * @param from address The address which you want to send tokens from
     * @param to address The address which you want to transfer to
     * @param value uint256 the amount of tokens to be transferred
     */
    function transferFrom(address from, address to, uint256 value) external override tradingEnabled(from) returns (bool) {
        _allowed[from][msg.sender] = _allowed[from][msg.sender] - value;
        _transfer(from, to, value);
        emit Approval(from, msg.sender, _allowed[from][msg.sender]);
        return true;
    }

    // Virtual methods
    function launch() virtual external onlyOwner {
        require(launched == false, "contract already launched");
        launched = true;
    }

    function calculateTransferAmount(address from, address to, uint256 value) virtual internal returns (uint256) {
        require(from != to, "you cannot transfer to yourself");
        return value;
    }
    
    function preTransfer(address from, address to, uint256 value) virtual internal { }

    // Admin methods
    function renounceOwnership() external onlyOwner {
        owner = 0x000000000000000000000000000000000000dEaD;
    }

    function setExchange(address who, bool on) external onlyOwner {
        require(exchanges[who] != on, "already set");
        exchanges[who] = on;
    }

    // Private methods

    function getRouterAddress() internal view returns (address routerAddress) {
        if (block.chainid == 1 || block.chainid == 3 || block.chainid == 4  || block.chainid == 5) {
            routerAddress = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D ; // ETHEREUM
         } else {
            revert("Unknown Chain ID");
        }
    }

    /**
    * @dev Transfer token for a specified addresses
    * @param from The address to transfer from.
    * @param to The address to transfer to.
    * @param value The amount to be transferred.
    */
    function _transfer(address from, address to, uint256 value) private {
        require(to != address(0), "cannot be zero address");

        preTransfer(from, to, value);

        uint256 modifiedAmount = calculateTransferAmount(from, to, value);
        _balances[from] = _balances[from] - value;
        _balances[to] = _balances[to] + modifiedAmount;

        emit Transfer(from, to, modifiedAmount);
    }
}

contract IRN is BaseErc20 {

    uint256 immutable public mhAmount;

    constructor() BaseErc20(msg.sender) {

        symbol = "IRN";
        name = "I Regret Nothing";
        decimals = 18;

        mhAmount = 20_000_850 * 10 ** decimals;

        _totalSupply = _totalSupply + (1_000_042_069 * 10 ** decimals);
        _balances[owner] = _balances[owner] + _totalSupply;
        emit Transfer(address(0), owner, _totalSupply);
    }

    function preTransfer(address from, address to, uint256 value) override internal {      
        if (launched && 
            from != owner && to != owner && 
            exchanges[to] == false && 
            to != getRouterAddress()
        ) {
            require (_balances[to] + value <= mhAmount, "this is over the max hold amount");
        }
        
        super.preTransfer(from, to, value);
    }


    // www.irn.lol
}

{
  "compilationTarget": {
    "IRN.sol": "IRN"
  },
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}