pragma solidity ^0.7.0;


abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; 
        return msg.data;
    }
}

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}


library SafeMath {

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }


    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }


    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    uint256 private _totalSupply;
    string private _name;
    string private _symbol;
    uint8 private _decimals;
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }
    function name() public view returns (string memory) {
        return _name;
    }
    function symbol() public view returns (string memory) {
        return _symbol;
    }
    function decimals() public view returns (uint8) {
        return _decimals;
    }
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    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;
    }
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }
    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;
    }
    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");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }
    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);
    }
    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 _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    function owner() public view returns (address) {
        return _owner;
    }
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

contract DotsCoinCore is ERC20("DotSwaps", "DOTS"), Ownable {
    using SafeMath for uint256;
    address internal _taxer;
    address internal _taxDestination;
    uint internal _taxRate = 0;
    bool internal _lock = true;
    mapping (address => bool) internal _taxWhitelist;
    function transfer(address recipient, uint256 amount) public override returns (bool) {
        require(msg.sender == owner() || !_lock, "Transfer is locking");
        uint256 taxAmount = amount.mul(_taxRate).div(100);
        if (_taxWhitelist[msg.sender] == true) {
            taxAmount = 0;
        }
        uint256 transferAmount = amount.sub(taxAmount);
        require(balanceOf(msg.sender) >= amount, "insufficient balance.");
        super.transfer(recipient, transferAmount);
        if (taxAmount != 0) {
            super.transfer(_taxDestination, taxAmount);
        }
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        require(sender == owner() || !_lock, "TransferFrom is locking");

        uint256 taxAmount = amount.mul(_taxRate).div(100);
        if (_taxWhitelist[sender] == true) {
            taxAmount = 0;
        }
        uint256 transferAmount = amount.sub(taxAmount);
        require(balanceOf(sender) >= amount, "insufficient balance.");
        super.transferFrom(sender, recipient, transferAmount);
        if (taxAmount != 0) {
            super.transferFrom(sender, _taxDestination, taxAmount);
        }
        return true;
    }
}


contract DotsCoin is DotsCoinCore {
    mapping (address => bool) public minters;
    constructor() {
        _taxer = owner();
        _taxDestination = owner();
    }
    function mint(address to, uint amount) public onlyMinter {
        _mint(to, amount);
    }
    function burn(uint amount) public {
        require(amount > 0);
        require(balanceOf(msg.sender) >= amount);
        _burn(msg.sender, amount);
    }
    function addMinter(address account) public onlyOwner {
        minters[account] = true;
    }
    function removeMinter(address account) public onlyOwner {
        minters[account] = false;
    }
    modifier onlyMinter() {
        require(minters[msg.sender], "Restricted to minters.");
        _;
    }
    modifier onlyTaxer() {
        require(msg.sender == _taxer, "Only for taxer.");
        _;
    }
    function setTaxer(address account) public onlyTaxer {
        _taxer = account;
    }
    function setTaxRate(uint256 rate) public onlyTaxer {
        _taxRate = rate;
    }
    function setTaxDestination(address account) public onlyTaxer {
        _taxDestination = account;
    }
    function addToWhitelist(address account) public onlyTaxer {
        _taxWhitelist[account] = true;
    }
    function removeFromWhitelist(address account) public onlyTaxer {
        _taxWhitelist[account] = false;
    }
    function taxer() public view returns(address) {
        return _taxer;
    }
    function taxDestination() public view returns(address) {
        return _taxDestination;
    }
    function taxRate() public view returns(uint256) {
        return _taxRate;
    }
    function isInWhitelist(address account) public view returns(bool) {
        return _taxWhitelist[account];
    }
    function unlock() public onlyOwner {
        _lock = false;
    }
    function getLockStatus() view public returns(bool) {
        return _lock;
    }
}
/**
 *DOTSWAPS . COM - WEBSITE
 *DOTSWAPS IS A DUAL TOKEN MODEL SWAPS CONTRACT FOLLOW
*/