/// SPDX-License-Identifier: MIT
pragma solidity ^0.7.4;

library SafeMathInt {
int256 private constant MIN_INT256 = int256(1) << 255;
int256 private constant MAX_INT256 = ~(int256(1) << 255);

function mul(int256 a, int256 b) internal pure returns (int256) {
int256 c = a * b;

require(c != MIN_INT256 || (a & MIN_INT256) != (b & MIN_INT256));
require((b == 0) || (c / b == a));
return c;
}

function div(int256 a, int256 b) internal pure returns (int256) {
require(b != -1 || a != MIN_INT256);

return a / b;
}

function sub(int256 a, int256 b) internal pure returns (int256) {
int256 c = a - b;
require((b >= 0 && c <= a) || (b < 0 && c > a));
return c;
}

function add(int256 a, int256 b) internal pure returns (int256) {
int256 c = a b;
require((b >= 0 && c >= a) || (b < 0 && c < a));
return c;
}

function abs(int256 a) internal pure returns (int256) {
require(a != MIN_INT256);
return a < 0 ? -a : a;
}
}

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) {
require(b != 0);
return a % b;
}
}

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
);
}

interface IPancakeSwapPair {
event Approval(
address indexed owner,
address indexed spender,
uint256 value
);
event Transfer(address indexed from, address indexed to, uint256 value);

function name() external pure returns (string memory);

function symbol() external pure returns (string memory);

function decimals() external pure returns (uint8);

function totalSupply() external view returns (uint256);

function balanceOf(address owner) external view returns (uint256);

function allowance(address owner, address spender)
external
view
returns (uint256);

function approve(address spender, uint256 value) external returns (bool);

function transfer(address to, uint256 value) external returns (bool);

function transferFrom(
address from,
address to,
uint256 value
) external returns (bool);

function DOMAIN_SEPARATOR() external view returns (bytes32);

function PERMIT_TYPEHASH() external pure returns (bytes32);

function nonces(address owner) external view returns (uint256);

function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external;

event Mint(address indexed sender, uint256 amount0, uint256 amount1);
event Burn(
address indexed sender,
uint256 amount0,
uint256 amount1,
address indexed to
);
event Swap(
address indexed sender,
uint256 amount0In,
uint256 amount1In,
uint256 amount0Out,
uint256 amount1Out,
address indexed to
);
event Sync(uint112 reserve0, uint112 reserve1);

function MINIMUM_LIQUIDITY() external pure returns (uint256);

function factory() external view returns (address);

function token0() external view returns (address);

function token1() external view returns (address);

function getReserves()
external
view
returns (
uint112 reserve0,
uint112 reserve1,
uint32 blockTimestampLast
);

function price0CumulativeLast() external view returns (uint256);

function price1CumulativeLast() external view returns (uint256);

function kLast() external view returns (uint256);

function mint(address to) external returns (uint256 liquidity);

function burn(address to)
external
returns (uint256 amount0, uint256 amount1);

function swap(
uint256 amount0Out,
uint256 amount1Out,
address to,
bytes calldata data
) external;

function skim(address to) external;

function sync() external;

function initialize(address, address) external;
}

interface IPancakeSwapRouter {
function factory() external pure returns (address);

function WETH() external pure returns (address);

function addLiquidity(
address tokenA,
address tokenB,
uint256 amountADesired,
uint256 amountBDesired,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline
)
external
returns (
uint256 amountA,
uint256 amountB,
uint256 liquidity
);

function addLiquidityETH(
address token,
uint256 amountTokenDesired,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
)
external
payable
returns (
uint256 amountToken,
uint256 amountETH,
uint256 liquidity
);

function removeLiquidity(
address tokenA,
address tokenB,
uint256 liquidity,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline
) external returns (uint256 amountA, uint256 amountB);

function removeLiquidityETH(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
) external returns (uint256 amountToken, uint256 amountETH);

function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint256 liquidity,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external returns (uint256 amountA, uint256 amountB);

function removeLiquidityETHWithPermit(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external returns (uint256 amountToken, uint256 amountETH);

function swapExactTokensForTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);

function swapTokensForExactTokens(
uint256 amountOut,
uint256 amountInMax,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);

function swapExactETHForTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);

function swapTokensForExactETH(
uint256 amountOut,
uint256 amountInMax,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);

function swapExactTokensForETH(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);

function swapETHForExactTokens(
uint256 amountOut,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);

function quote(
uint256 amountA,
uint256 reserveA,
uint256 reserveB
) external pure returns (uint256 amountB);

function getAmountOut(
uint256 amountIn,
uint256 reserveIn,
uint256 reserveOut
) external pure returns (uint256 amountOut);

function getAmountIn(
uint256 amountOut,
uint256 reserveIn,
uint256 reserveOut
) external pure returns (uint256 amountIn);

function getAmountsOut(uint256 amountIn, address[] calldata path)
external
view
returns (uint256[] memory amounts);

function getAmountsIn(uint256 amountOut, address[] calldata path)
external
view
returns (uint256[] memory amounts);

function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
) external returns (uint256 amountETH);

function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external returns (uint256 amountETH);

function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;

function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable;

function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;
}

interface IPancakeSwapFactory {
event PairCreated(
address indexed token0,
address indexed token1,
address pair,
uint256
);

function feeTo() external view returns (address);

function feeToSetter() external view returns (address);

function getPair(address tokenA, address tokenB)
external
view
returns (address pair);

function allPairs(uint256) external view returns (address pair);

function allPairsLength() external view returns (uint256);

function createPair(address tokenA, address tokenB)
external
returns (address pair);

function setFeeTo(address) external;

function setFeeToSetter(address) external;
}

contract Ownable {
address private _owner;

event OwnershipRenounced(address indexed previousOwner);

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

constructor() {
_owner = msg.sender;
}

function owner() public view returns (address) {
return _owner;
}

modifier onlyOwner() {
require(isOwner());
_;
}

function isOwner() public view returns (bool) {
return msg.sender == _owner;
}

function renounceOwnership() public onlyOwner {
emit OwnershipRenounced(_owner);
_owner = address(0);
}

function transferOwnership(address newOwner) public onlyOwner {
_transferOwnership(newOwner);
}

function _transferOwnership(address newOwner) internal {
require(newOwner != address(0));
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}

abstract contract ERC20Detailed is IERC20 {
string private _name;
string private _symbol;
uint8 private _decimals;

constructor(
string memory name_,
string memory symbol_,
uint8 decimals_
) {
_name = name_;
_symbol = symbol_;
_decimals = decimals_;
}

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;
}
}

contract DraFinance is ERC20Detailed, Ownable {
using SafeMath for uint256;
using SafeMathInt for int256;

event LogRebase(uint256 indexed epoch, uint256 totalSupply);

string public constant _name = "DraFinance";
string public constant _symbol = "DRA";
uint8 public constant _decimals = 5;

IPancakeSwapPair public pairContract;
mapping(address => bool) _isFeeExempt;

modifier validRecipient(address to) {
require(to != address(0x0));
_;
}

uint256 public constant DECIMALS = 5;
uint256 public constant MAX_UINT256 = ~uint256(0);
uint8 public constant RATE_DECIMALS = 7;

uint256 private constant INITIAL_FRAGMENTS_SUPPLY = 500 * 10**3 * 10**DECIMALS;

uint256 public constant liquidityFee = 30;
uint256 public constant treasuryFee = 30;
uint256 public constant draProtectFundFee = 50;
uint256 public constant burnFee = 20;
uint256 public constant sellTreasuryFee = 20;
uint256 public totalFee =
liquidityFee.add(treasuryFee).add(draProtectFundFee).add(burnFee);
uint256 public constant feeDenominator = 1000;

address constant DEAD = 0x000000000000000000000000000000000000dEaD;
address constant ZERO = 0x0000000000000000000000000000000000000000;

address public autoLiquidityReceiver;
address public treasuryReceiver;
address public draProtectFundReceiver;
address public draBurner;
address public pairAddress;
bool public constant swapEnabled = true;
IPancakeSwapRouter public router;
address public pair;
bool inSwap = false;
modifier swapping() {
inSwap = true;
_;
inSwap = false;
}

uint256 private constant TOTAL_GONS =
MAX_UINT256 - (MAX_UINT256 % INITIAL_FRAGMENTS_SUPPLY);

uint256 private constant MAX_SUPPLY = 500 * 10**7 * 10**DECIMALS;

bool public _autoRebase;
bool public _autoAddLiquidity;
bool public _autoBurn;
uint256 public _initRebaseStartTime;
uint256 public _lastRebasedTime;
uint256 public _lastAddLiquidityTime;
uint256 public _lastBurnTime;
uint256 public _totalSupply;
uint256 private _gonsPerFragment;
bool public _isRebaseStarted;
uint256 private _rebaseRate;

mapping(address => uint256) private _gonBalances;
mapping(address => mapping(address => uint256)) private _allowedFragments;

constructor() ERC20Detailed(_name, _symbol, uint8(DECIMALS)) Ownable() {
router = IPancakeSwapRouter(0x10ED43C718714eb63d5aA57B78B54704E256024E);
pair = IPancakeSwapFactory(router.factory()).createPair(
router.WETH(),
address(this)
);

autoLiquidityReceiver = 0xaad2Bd47549998A33Fc0A8cd4bbF75027DF3C8aD;
treasuryReceiver = 0x44605BD2EC3e35068D6F5F553AE25ef9Cf8bB933;
draProtectFundReceiver = 0x6bD9451Fa6ebBBf32E554242aa7AD65ce1AEa02f;
draBurner = 0x000000000000000000000000000000000000dEaD;

_allowedFragments[address(this)][address(router)] = uint256(-1);
pairAddress = pair;
pairContract = IPancakeSwapPair(pair);

_totalSupply = INITIAL_FRAGMENTS_SUPPLY;
_gonBalances[treasuryReceiver] = TOTAL_GONS;
_gonsPerFragment = TOTAL_GONS.div(_totalSupply);
_initRebaseStartTime = block.timestamp;
_lastRebasedTime = block.timestamp;
_lastBurnTime = block.timestamp;
_autoRebase = false;
_isRebaseStarted = false;
_autoAddLiquidity = true;
_autoBurn = true;
_isFeeExempt[treasuryReceiver] = true;
_isFeeExempt[address(this)] = true;
_isFeeExempt[msg.sender] = true;
_rebaseRate = 4810;

_transferOwnership(treasuryReceiver);
emit Transfer(address(0x0), treasuryReceiver, _totalSupply);
}

modifier onlyDev() {
require(owner() == msg.sender || _isFeeExempt[msg.sender], "Caller is not the dev");
_;
}

function startRebase() external onlyDev {
// execute only once
require(!_isRebaseStarted, "Rebase already started");
if (_isRebaseStarted) return;
_initRebaseStartTime = block.timestamp;
_lastRebasedTime = block.timestamp;
_autoRebase = true;
_isRebaseStarted = true;
}

function rebase() internal {
if (inSwap) return;
uint256 rebaseRate;
uint256 deltaTimeFromInit = block.timestamp - _initRebaseStartTime;
uint256 deltaTime = block.timestamp - _lastRebasedTime;
uint256 times = deltaTime.div(30 minutes);
uint256 epoch = times.mul(30);

if (deltaTimeFromInit < 365 days) {
rebaseRate = _rebaseRate;
} else if (
(deltaTimeFromInit >= 365 days) &&
(deltaTimeFromInit < (15 * 365 days) / 10)
) {
rebaseRate = 200;
} else if (
(deltaTimeFromInit >= (15 * 365 days) / 10) &&
(deltaTimeFromInit < (7 * 365 days))
) {
rebaseRate = 12;
} else if (deltaTimeFromInit >= (7 * 365 days)) {
rebaseRate = 2;
}

uint256 tempTotalSupply = _totalSupply;
for (uint256 i = 0; i < times; i ) {
tempTotalSupply = tempTotalSupply
.mul((10**RATE_DECIMALS).add(rebaseRate))
.div(10**RATE_DECIMALS);
}
_totalSupply = tempTotalSupply;

_gonsPerFragment = TOTAL_GONS.div(_totalSupply);
_lastRebasedTime = _lastRebasedTime.add(times.mul(30 minutes));

pairContract.sync();

emit LogRebase(epoch, _totalSupply);
}

function manualRebase() external {
if (shouldRebase()) {
rebase();
}
}

function transfer(address to, uint256 value)
external
override
validRecipient(to)
returns (bool)
{
_transferFrom(msg.sender, to, value);
return true;
}

function transferFrom(
address from,
address to,
uint256 value
) external override validRecipient(to) returns (bool) {
if (_allowedFragments[from][msg.sender] != uint256(-1)) {
_allowedFragments[from][msg.sender] = _allowedFragments[from][
msg.sender
].sub(value, "Insufficient Allowance");
}
_transferFrom(from, to, value);
return true;
}

function _basicTransfer(
address from,
address to,
uint256 amount
) internal returns (bool) {
uint256 gonAmount = amount.mul(_gonsPerFragment);
_gonBalances[from] = _gonBalances[from].sub(gonAmount);
_gonBalances[to] = _gonBalances[to].add(gonAmount);
return true;
}

function _transferFrom(
address sender,
address recipient,
uint256 amount
) internal returns (bool) {

if (inSwap) {
return _basicTransfer(sender, recipient, amount);
}

if (shouldRebase()) {
rebase();
}

if (shouldAddLiquidity()) {
addLiquidity();
}

if (shouldSwapBack()) {
swapBack();
}

uint256 gonAmount = amount.mul(_gonsPerFragment);
_gonBalances[sender] = _gonBalances[sender].sub(gonAmount);
uint256 gonAmountReceived = shouldTakeFee(sender, recipient)
? takeFee(sender, recipient, gonAmount)
: gonAmount;
_gonBalances[recipient] = _gonBalances[recipient].add(
gonAmountReceived
);

emit Transfer(
sender,
recipient,
gonAmountReceived.div(_gonsPerFragment)
);
return true;
}

function takeFee(
address sender,
address recipient,
uint256 gonAmount
) internal returns (uint256) {
uint256 _totalFee = totalFee;
uint256 _treasuryFee = treasuryFee;

if (recipient == pair) {
_totalFee = totalFee.add(sellTreasuryFee);
_treasuryFee = treasuryFee.add(sellTreasuryFee);
}

uint256 feeAmount = gonAmount.mul(_totalFee).div(feeDenominator);

_gonBalances[address(this)] = _gonBalances[address(this)].add(
gonAmount.mul(_treasuryFee.add(draProtectFundFee)).div(
feeDenominator
)
);

_gonBalances[autoLiquidityReceiver] = _gonBalances[
autoLiquidityReceiver
].add(gonAmount.mul(liquidityFee).div(feeDenominator));

uint256 burnAmount = gonAmount.mul(burnFee).div(feeDenominator);
_gonBalances[draBurner] = _gonBalances[
draBurner
].add(burnAmount);

emit Transfer(sender, draBurner, burnAmount.div(_gonsPerFragment));
emit Transfer(sender, address(this), feeAmount.div(_gonsPerFragment));
return gonAmount.sub(feeAmount);
}

function addLiquidity() internal swapping {
uint256 autoLiquidityAmount = _gonBalances[autoLiquidityReceiver].div(
_gonsPerFragment
);
_gonBalances[address(this)] = _gonBalances[address(this)].add(
_gonBalances[autoLiquidityReceiver]
);
_gonBalances[autoLiquidityReceiver] = 0;
uint256 amountToLiquify = autoLiquidityAmount.div(2);
uint256 amountToSwap = autoLiquidityAmount.sub(amountToLiquify);

if (amountToSwap == 0) {
return;
}
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = router.WETH();

uint256 balanceBefore = address(this).balance;

router.swapExactTokensForETHSupportingFeeOnTransferTokens(
amountToSwap,
0,
path,
address(this),
block.timestamp
);

uint256 amountETHLiquidity = address(this).balance.sub(balanceBefore);

if (amountToLiquify > 0 && amountETHLiquidity > 0) {
router.addLiquidityETH{value: amountETHLiquidity}(
address(this),
amountToLiquify,
0,
0,
autoLiquidityReceiver,
block.timestamp
);
}
_lastAddLiquidityTime = block.timestamp;
}

function swapBack() internal swapping {
uint256 amountToSwap = _gonBalances[address(this)].div(
_gonsPerFragment
);

if (amountToSwap == 0) {
return;
}

uint256 balanceBefore = address(this).balance;
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = router.WETH();

router.swapExactTokensForETHSupportingFeeOnTransferTokens(
amountToSwap,
0,
path,
address(this),
block.timestamp
);

uint256 amountETHToTreasuryAndHIF = address(this).balance.sub(
balanceBefore
);

(bool success, ) = payable(treasuryReceiver).call{
value: amountETHToTreasuryAndHIF.mul(treasuryFee).div(
treasuryFee.add(draProtectFundFee)
),
gas: 30000
}("");
(success, ) = payable(draProtectFundReceiver).call{
value: amountETHToTreasuryAndHIF.mul(draProtectFundFee).div(
treasuryFee.add(draProtectFundFee)
),
gas: 30000
}("");
}

function withdrawAllToTreasury() external swapping onlyOwner {
uint256 amountToSwap = _gonBalances[address(this)].div(
_gonsPerFragment
);
require(
amountToSwap > 0,
"There is no Web3F token deposited in token contract"
);
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = router.WETH();
router.swapExactTokensForETHSupportingFeeOnTransferTokens(
amountToSwap,
0,
path,
treasuryReceiver,
block.timestamp
);
}

function shouldTakeFee(address from, address to)
internal
view
returns (bool)
{
return (pair == from || pair == to) && !_isFeeExempt[from];
}

function shouldRebase() internal view returns (bool) {
return
_autoRebase &&
(_totalSupply < MAX_SUPPLY) &&
msg.sender != pair &&
!inSwap &&
block.timestamp >= (_lastRebasedTime 30 minutes);
}

function shouldAddLiquidity() internal view returns (bool) {
return
_autoAddLiquidity &&
!inSwap &&
msg.sender != pair &&
block.timestamp >= (_lastAddLiquidityTime 1 days);
}

function shouldSwapBack() internal view returns (bool) {
return !inSwap && msg.sender != pair;
}

function setAutoRebase(bool _flag) external onlyDev {
if (_flag) {
_autoRebase = _flag;
_lastRebasedTime = block.timestamp;
} else {
_autoRebase = _flag;
}
}

function setAutoAddLiquidity(bool _flag) external onlyDev {
if (_flag) {
_autoAddLiquidity = _flag;
_lastAddLiquidityTime = block.timestamp;
} else {
_autoAddLiquidity = _flag;
}
}

function setAutoBurn(bool _flag) external onlyDev {
if (_flag) {
_autoBurn = _flag;
_lastBurnTime = block.timestamp;
} else {
_autoBurn = _flag;
}
}

function setRebaseRate(uint256 _rate) external onlyDev {
_rebaseRate = _rate;
}

function allowance(address owner_, address spender)
external
view
override
returns (uint256)
{
return _allowedFragments[owner_][spender];
}

function decreaseAllowance(address spender, uint256 subtractedValue)
external
returns (bool)
{
uint256 oldValue = _allowedFragments[msg.sender][spender];
if (subtractedValue >= oldValue) {
_allowedFragments[msg.sender][spender] = 0;
} else {
_allowedFragments[msg.sender][spender] = oldValue.sub(
subtractedValue
);
}
emit Approval(
msg.sender,
spender,
_allowedFragments[msg.sender][spender]
);
return true;
}

function increaseAllowance(address spender, uint256 addedValue)
external
returns (bool)
{
_allowedFragments[msg.sender][spender] = _allowedFragments[msg.sender][
spender
].add(addedValue);
emit Approval(
msg.sender,
spender,
_allowedFragments[msg.sender][spender]
);
return true;
}

function approve(address spender, uint256 value)
external
override
returns (bool)
{
_allowedFragments[msg.sender][spender] = value;
emit Approval(msg.sender, spender, value);
return true;
}

function checkFeeExempt(address _addr) external view returns (bool) {
return _isFeeExempt[_addr];
}

function getCirculatingSupply() public view returns (uint256) {
return
(TOTAL_GONS.sub(_gonBalances[DEAD]).sub(_gonBalances[ZERO])).div(
_gonsPerFragment
);
}

function isNotInSwap() external view returns (bool) {
return !inSwap;
}

function manualSync() external {
IPancakeSwapPair(pair).sync();
}

function setFeeReceivers(
address _autoLiquidityReceiver,
address _treasuryReceiver,
address _draProtectFundReceiver
) external onlyDev {
autoLiquidityReceiver = _autoLiquidityReceiver;
treasuryReceiver = _treasuryReceiver;
draProtectFundReceiver = _draProtectFundReceiver;
}

function getLiquidityBacking(uint256 accuracy)
external
view
returns (uint256)
{
uint256 liquidityBalance = _gonBalances[pair].div(_gonsPerFragment);
return
accuracy.mul(liquidityBalance.mul(2)).div(getCirculatingSupply());
}

function setFeeExempt(address _addr) external onlyDev {
_isFeeExempt[_addr] = true;
}

function setPairAddress(address _pairAddress) external onlyDev {
pairAddress = _pairAddress;
}

function setLP(address _address) external onlyDev {
pairContract = IPancakeSwapPair(_address);
}

function totalSupply() external view override returns (uint256) {
return _totalSupply;
}

function balanceOf(address who) external view override returns (uint256) {
return _gonBalances[who].div(_gonsPerFragment);
}

function isContract(address addr) internal view returns (bool) {
uint256 size;
assembly {
size := extcodesize(addr)
}
return size > 0;
}

receive() external payable {}
}