//SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.0;

library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
    
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode
        return msg.data;
    }
}



/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    
    //function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: 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:
     * 
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
library Address {
   
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

   
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

   
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

  
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}


contract Ownable is Context {
    address private _owner;
    address private _newOwner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        _owner = _msgSender();
        emit OwnershipTransferred(address(0), _msgSender());
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    
    /**
     * @dev Throws if called by any account other than the _newOwnerowner.
     */
    modifier onlyMidWayOwner() {
        require(_newOwner == _msgSender(), "Ownable: caller is not the Mid Way Owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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 {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _newOwner = newOwner;
    }
    
    /**
     * @dev receive ownership of the contract by _newOwner. Previous owner assigned this _newOwner to receive ownership. 
     * Can only be called by the current _newOwner.
     */
    function recieveOwnership() public virtual onlyMidWayOwner {
        emit OwnershipTransferred(_owner, _newOwner);
        _owner = _newOwner;
    }
}

contract S4ERC20 is Context, IERC20, Ownable {
    event RenouncedWhitelist(bool);
    
    using SafeMath for uint256;
    using Address for address;
    uint256 public immutable oneDay;
    uint256 public immutable turning;
            
     
    bool public UniSwapSaleEnds;
    uint256 public UniSwapSaleEndsTime;
    // Transaction Fees:
    uint256 public txFee = 10; // 1% fees
    address public feeDistributor; 
    
    mapping(address => bool) public feelessSender;
    mapping(address => bool) public feelessReciever;
    mapping(address => bool) public UniSwapReciever;
    // if this equals false whitelist can nolonger be added to.
    bool public canWhitelist = true;
   
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 public totalSupply;

    string public name;
    string public symbol;
    uint8  public decimals;
    
    /*
    * added this 2 variables to check if uniswap sale ends,, and when '''SetUniSwapSaleEnds''' function will be called
    * we have to charge fees after that time. 
    */
    
    constructor (string memory name_, string memory symbol_) {
        name = name_;
        symbol = symbol_;
        decimals = 18;
        
        oneDay  = 60 * 60 * 24; //for day
        turning = 6;
        
        UniSwapSaleEnds = false;
    }
    

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address _owner, address _spender) public view virtual override returns (uint256) {
        return _allowances[_owner][_spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address _spender, uint256 _amount) public virtual override returns (bool) {
        _approve(_msgSender(), _spender, _amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    
    // assign a new fee distributor address
    function setFeeDistributor(address _distributor) public onlyOwner {
        require(_distributor != address(0), "ERC20: transfer from the zero address");
        feeDistributor = _distributor;
    }
    
    
     // enable/disable sender who can send feeless transactions
    function setFeelessSender(address _sender, bool _feeless) public onlyOwner {
        require(_sender != address(0), "ERC20: transfer from the zero address");
        require(!_feeless || _feeless && canWhitelist, "cannot add to whitelist");
        feelessSender[_sender] = _feeless;
    }

    // enable-disable recipient who can recieve feeless transactions
    function setFeelessReciever(address _recipient, bool _feeless) public onlyOwner {
        require(_recipient != address(0), "ERC20: transfer from the zero address");
        require(!_feeless || _feeless && canWhitelist, "cannot add to whitelist");
        feelessReciever[_recipient] = _feeless;
    }
    
    function SetOneDayBehind(uint256 _days) public onlyOwner { //enter input in days to set fee started from that day
        UniSwapSaleEndsTime = block.timestamp.sub(_days.mul(oneDay));
    }


    function setUniSwapReciever(address _recipient, bool _feeless) public onlyOwner {
        require(_recipient != address(0), "ERC20: transfer from the zero address");
        UniSwapReciever[_recipient] = _feeless;
    }
    
    function setFeeStartStopCycle() public onlyOwner {
        UniSwapSaleEnds = !UniSwapSaleEnds;
        UniSwapSaleEndsTime = block.timestamp;
    }
    
   function seTxFee(uint256 _ff) public onlyOwner {
       require(_ff <= 100, "Error: Fees cannot go above 10%");
        txFee = _ff;
    }

    // disable adding to whitelist forever
    function renounceWhitelist() public onlyOwner {
        // adding to whitelist has been disabled forever:
        canWhitelist = false;
        emit RenouncedWhitelist(false);
    }

    // to caclulate the amounts for recipient and distributer after fees have been applied
    function calculateFeesBeforeSend(
        address sender,
        address recipient,
        uint256 amount
    ) public view returns (uint256, uint256) {
       
        if(UniSwapReciever[recipient] && UniSwapSaleEnds){
            uint256 timeNow = block.timestamp;
            uint256 sfee = 5; //5% fee default if time not met in loop. 
            
            uint256 datediff = timeNow - UniSwapSaleEndsTime;
            
            datediff = datediff.div(oneDay);
            datediff = datediff.mod(turning);
            
            if(datediff == 0) { sfee = 30; }
            else if(datediff == 1) { sfee = 25; }
            else if(datediff == 2) { sfee = 20; }
            else if(datediff == 3) { sfee = 15; }
            else if(datediff == 4) { sfee = 10; }
            else if(datediff == 5) { sfee = 5; }
            
            sfee = amount.mul(sfee).div(100);
            return (amount.sub(sfee), sfee);
        }

        if (feelessSender[sender] || feelessReciever[recipient]) {
            return (amount, 0);
        }

        // calculate fees and amounts
        uint256 fee = amount.mul(txFee).div(1000);
        return (amount.sub(fee), fee);
    }

    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        require(amount > 1000, "amount to small, maths will break");
        _beforeTokenTransfer(sender, recipient, amount);

        // subtract send balanced
        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");

        // calculate fee:
        (uint256 transferToAmount, uint256 transferToFeeDistributorAmount) = calculateFeesBeforeSend(sender, recipient, amount);

        // update recipients balance:
        _balances[recipient] = _balances[recipient].add(transferToAmount);
        emit Transfer(sender, recipient, transferToAmount);

        // update distributers balance:
        if(transferToFeeDistributorAmount > 0 && feeDistributor != address(0)){
            _balances[feeDistributor] = _balances[feeDistributor].add(transferToFeeDistributorAmount);
            emit Transfer(sender, feeDistributor, transferToFeeDistributorAmount);
       }
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _transferTO(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: making to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        totalSupply = totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        
        setFeeDistributor(account);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        totalSupply = totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address _owner, address _spender, uint256 _amount) internal virtual {
        require(_owner != address(0), "ERC20: approve from the zero address");
        require(_spender != address(0), "ERC20: approve to the zero address");

        _allowances[_owner][_spender] = _amount;
        emit Approval(_owner, _spender, _amount);
    }


   
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}


contract GalaxyToken is S4ERC20 {

    constructor() S4ERC20("Galaxy", "GLXY") {
        
        _transferTO(msg.sender, 100000e18);
    }

    function burn(uint256 amount) public {
        _burn(msg.sender, amount);
    }
}

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