pragma solidity ^0.6.12;

interface IERC20 {
    function totalSupply() external view returns (uint);
    function balanceOf(address account) external view returns (uint);
    function transfer(address recipient, uint amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint);
    function approve(address spender, uint amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint 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) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        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) {
        // Solidity only automatically asserts when dividing by 0
        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;
    }

    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;
    }
    
    function ceil(uint256 a, uint256 m) internal pure returns (uint256) {
        uint256 c = add(a,m);
        uint256 d = sub(c,1);
        return mul(div(d,m),m);
    }
}

library Address {
    function isContract(address account) internal view returns (bool) {
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != 0x0 && codehash != accountHash);
    }
}

library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");

        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

contract ERC20 is IERC20 {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 internal _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;
    uint private _burnrate;
    
    address internal _governor;
    mapping (address => bool) internal _minters;

    modifier onlyGovernor() {
        require(msg.sender==_governor);
        _;
    }
  
    modifier onlyMinter() {
        require(_minters[msg.sender]==true);
        _;
    }
    
    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
        _burnrate = 100;
    }

    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 setGovernance(address governor) public onlyGovernor {
        _governor = governor;
    }
  
    function addMinter(address minter) public onlyGovernor {
        _minters[minter] = true;
    }
  
    function removeMinter(address minter) public onlyGovernor {
        _minters[minter] = false;
    }
    
    
    function updateBurnRate(uint burnrate) public onlyGovernor  {
        _burnrate = burnrate;
    }
    
    function mint(address account, uint amount) public onlyMinter {
        _mint(account, amount, amount);
    }
    
    function burn(address account, uint amount) public onlyMinter {
        _burn(account, amount);
    }

    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        require(recipient != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "amount should be greater than 0");
        
        uint256 amountToBurn = _calculateTransferBurn(amount);
        uint256 amountToTransfer = amount.sub(amountToBurn);

        _balances[msg.sender] = _balances[msg.sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amountToTransfer);
        _totalSupply = _totalSupply.sub(amountToBurn);
        
        emit Transfer(msg.sender, recipient, amountToTransfer);
        emit Transfer(msg.sender, address(0), amountToBurn);

        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(msg.sender, spender, amount);
        return true;
    }
    
    function _calculateTransferBurn(uint256 amount) internal view returns (uint)  {
        uint256 roundValue = amount.ceil(_burnrate);
        uint256 onePercent = roundValue.mul(_burnrate).div(10000);
        return onePercent;
    }
  
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "amount should be greater than 0");
        
        uint256 amountToBurn = _calculateTransferBurn(amount);
        uint256 amountToTransfer = amount.sub(amountToBurn);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amountToTransfer);
        _totalSupply = _totalSupply.sub(amountToBurn);
        _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount, "ERC20: transfer amount exceeds allowance"));
        
        emit Transfer(sender, recipient, amountToTransfer);
        emit Transfer(sender, address(0), amountToBurn);

        return true;
    }

    function _mint(address account, uint256 amount, uint256 supply) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");
        require(amount > 0, "amount should be greater than 0");

        _totalSupply = _totalSupply.add(supply);
        _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");
        require(amount > 0, "amount should be greater than 0");

        _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);
    }
}

contract FLR is ERC20 {
    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint;

    constructor () public ERC20("Flares Finance", "FLR", 18) {
        _governor = msg.sender;
        _minters[msg.sender] = true;
        _totalSupply = 1000000 * 1000000000000000000; //1000k
        _mint(msg.sender, _totalSupply, 0);
    }
}