//SPDX-License-Identifier: UNLICENSED
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Rockstar | $RKSTR

Website: https://rockstar.army/
Telegram: https://t.me/RockstarArmy
Twitter: https://twitter.com/RockstarArmyERC
*/

pragma solidity 0.8.7;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

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, Ownable {
    mapping (address => uint256) internal _balances;
    mapping (address => mapping (address => uint256)) internal _allowed;
    uint256 internal _totalSupply;
    
    string public symbol;
    string public name;
    uint8 public decimals;

    mapping (address => bool) internal exchanges;

    constructor(address _owner) Ownable(_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 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 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 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 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 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 Rockstar is BaseErc20 {

    uint256 public mhAmount;

    constructor() BaseErc20(msg.sender) {

        symbol = "RKSTR";
        name = "Rockstar";
        decimals = 18;

        mhAmount = 300_005  * 10 ** decimals;

        _totalSupply = _totalSupply + (10_000_000 * 10 ** decimals);
        _balances[owner()] = _balances[owner()] + _totalSupply;
        emit Transfer(address(0), owner(), _totalSupply);
    }

    function preTransfer(address from, address to, uint256 value) override internal {      
        if (
            from != owner() && to != owner() && 
            exchanges[to] == false && 
            to != getRouterAddress() &&
            mhAmount > 0
        ) {
            require (_balances[to] + value <= mhAmount, "this is over the max hold amount");
        }
        
        super.preTransfer(from, to, value);
    }

    function setMhAmount(uint256 amount) external onlyOwner {
        mhAmount = amount;
    }
}

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