// File: contracts/MasterChef.sol



pragma solidity 0.6.12;

import '@sphynxswap/sphynx-swap-lib/contracts/math/SafeMath.sol';
import '@sphynxswap/sphynx-swap-lib/contracts/token/BEP20/IBEP20.sol';
import '@sphynxswap/sphynx-swap-lib/contracts/token/BEP20/SafeBEP20.sol';
import '@sphynxswap/sphynx-swap-lib/contracts/access/Ownable.sol';

import './SphynxToken.sol';

interface IMigratorChef {
	// Perform LP token migration from legacy PancakeSwap or any swap to SphynxSwap.
	// Take the current LP token address and return the new LP token address.
	// Migrator should have full access to the caller's LP token.
	// Return the new LP token address.
	//
	// XXX Migrator must have allowance access to PancakeSwap LP tokens.
	// SphynxSwap must mint EXACTLY the same amount of SphynxSwap LP tokens or
	// else something bad will happen. Traditional PancakeSwap does not
	// do that so be careful!
	function migrate(IBEP20 token) external returns (IBEP20);
}

// Have fun reading it. Hopefully it's bug-free. God bless.
contract MasterChef is Ownable {
	using SafeMath for uint256;
	using SafeBEP20 for IBEP20;

	// Info of each user.
	struct UserInfo {
		uint256 amount; // How many LP tokens the user has provided.
		uint256 rewardDebt; // Reward debt. See explanation below.
		//
		// We do some fancy math here. Basically, any point in time, the amount of Sphynxs
		// entitled to a user but is pending to be distributed is:
		//
		//   pending reward = (user.amount * pool.accsphynxPerShare) - user.rewardDebt
		//
		// Whenever a user deposits or withdraws LP tokens to a pool. Here's what happens:
		//   1. The pool's `accsphynxPerShare` (and `lastRewardBlock`) gets updated.
		//   2. User receives the pending reward sent to his/her address.
		//   3. User's `amount` gets updated.
		//   4. User's `rewardDebt` gets updated.
	}

	// Info of each pool.
	struct PoolInfo {
		IBEP20 lpToken; // Address of LP token contract.
		uint256 allocPoint; // How many allocation points assigned to this pool. sphynxs to distribute per block.
		uint256 lastRewardBlock; // Last block number that sphynxs distribution occurs.
		uint256 accSphynxPerShare; // Accumulated Sphynxs per share, times 1e12. See below.
	}

	// The sphynx TOKEN!
	SphynxToken public sphynx;
	// Dev address.
	address public devaddr;
	// sphynx tokens created per block.
	uint256 public sphynxPerBlock;
	// Bonus muliplier for early sphynx makers.
	uint256 public BONUS_MULTIPLIER = 1;
	// The migrator contract. It has a lot of power. Can only be set through governance (owner).
	IMigratorChef public migrator;

	uint256 public toBurn = 20;

	// Info of each pool.
	PoolInfo[] public poolInfo;
	// Info of each user that stakes LP tokens.
	mapping(uint256 => mapping(address => UserInfo)) public userInfo;
	// Total allocation poitns. Must be the sum of all allocation points in all pools.
	uint256 public totalAllocPoint = 0;
	// The block number when sphynx mining starts.
	uint256 public startBlock;

	event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
	event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
	event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);
	event SetDev(address newDev);

	constructor(
		SphynxToken _sphynx,
		address _devaddr,
		uint256 _sphynxPerBlock,
		uint256 _startBlock
	) public {
		sphynx = _sphynx;
		devaddr = _devaddr;
		sphynxPerBlock = _sphynxPerBlock;
		startBlock = _startBlock;

		// staking pool
		poolInfo.push(PoolInfo({ lpToken: _sphynx, allocPoint: 100, lastRewardBlock: startBlock, accSphynxPerShare: 0 }));

		totalAllocPoint = 100;
	}

	function updateMultiplier(uint256 multiplierNumber) public onlyOwner {
		BONUS_MULTIPLIER = multiplierNumber;
	}

	function poolLength() external view returns (uint256) {
		return poolInfo.length;
	}

	// Add a new lp to the pool. Can only be called by the owner.
	// XXX DO NOT add the same LP token more than once. Rewards will be messed up if you do.
	function add(
		uint256 _allocPoint,
		IBEP20 _lpToken,
		bool _withUpdate
	) public onlyOwner {
		if (_withUpdate) {
			massUpdatePools();
		}
		uint256 lastRewardBlock = block.number > startBlock ? block.number : startBlock;
		totalAllocPoint = totalAllocPoint.add(_allocPoint);
		poolInfo.push(PoolInfo({ lpToken: _lpToken, allocPoint: _allocPoint, lastRewardBlock: lastRewardBlock, accSphynxPerShare: 0 }));
	}

	// Update the given pool's sphynx allocation point. Can only be called by the owner.
	function set(
		uint256 _pid,
		uint256 _allocPoint,
		bool _withUpdate
	) public onlyOwner {
		if (_withUpdate) {
			massUpdatePools();
		}
		totalAllocPoint = totalAllocPoint.sub(poolInfo[_pid].allocPoint).add(_allocPoint);
		poolInfo[_pid].allocPoint = _allocPoint;
	}

	// Set the migrator contract. Can only be called by the owner.
	function setMigrator(IMigratorChef _migrator) public onlyOwner {
		migrator = _migrator;
	}

	// Migrate lp token to another lp contract. Can be called by anyone. We trust that migrator contract is good.
	function migrate(uint256 _pid) public {
		require(address(migrator) != address(0), 'migrate: no migrator');
		PoolInfo storage pool = poolInfo[_pid];
		IBEP20 lpToken = pool.lpToken;
		uint256 bal = lpToken.balanceOf(address(this));
		lpToken.safeApprove(address(migrator), bal);
		IBEP20 newLpToken = migrator.migrate(lpToken);
		require(bal == newLpToken.balanceOf(address(this)), 'migrate: bad');
		pool.lpToken = newLpToken;
	}

	function changeToBurn(uint256 value) public onlyOwner {
		toBurn = value;
	}

	// Return reward multiplier over the given _from to _to block.
	function getMultiplier(uint256 _from, uint256 _to) public view returns (uint256) {
		return _to.sub(_from).mul(BONUS_MULTIPLIER);
	}

	// View function to see pending sphynxs on frontend.
	function pendingSphynx(uint256 _pid, address _user) external view returns (uint256) {
		PoolInfo storage pool = poolInfo[_pid];
		UserInfo storage user = userInfo[_pid][_user];
		uint256 accSphynxPerShare = pool.accSphynxPerShare;
		uint256 lpSupply = pool.lpToken.balanceOf(address(this));
		if (block.number > pool.lastRewardBlock && lpSupply != 0) {
			uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
			uint256 sphynxReward = multiplier.mul(sphynxPerBlock).mul(pool.allocPoint).div(totalAllocPoint);
			accSphynxPerShare = accSphynxPerShare.add(sphynxReward.mul(1e12).div(lpSupply));
		}
		return user.amount.mul(accSphynxPerShare).div(1e12).sub(user.rewardDebt);
	}

	// Update reward variables for all pools. Be careful of gas spending!
	function massUpdatePools() public {
		uint256 length = poolInfo.length;
		for (uint256 pid = 0; pid < length; ++pid) {
			updatePool(pid);
		}
	}

	// Update reward variables of the given pool to be up-to-date.
	function updatePool(uint256 _pid) public {
		PoolInfo storage pool = poolInfo[_pid];
		if (block.number <= pool.lastRewardBlock) {
			return;
		}
		uint256 lpSupply = pool.lpToken.balanceOf(address(this));
		if (lpSupply == 0) {
			pool.lastRewardBlock = block.number;
			return;
		}
		uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
		uint256 sphynxReward = multiplier.mul(sphynxPerBlock).mul(pool.allocPoint).div(totalAllocPoint);
		sphynx.mint(devaddr, sphynxReward.div(100));
		sphynx.mint(address(this), sphynxReward);
		pool.accSphynxPerShare = pool.accSphynxPerShare.add(sphynxReward.mul(1e12).div(lpSupply));
		pool.lastRewardBlock = block.number;
	}

	// Deposit LP tokens to MasterChef for sphynx allocation.
	function deposit(uint256 _pid, uint256 _amount) public {
		require(_pid != 0, 'deposit sphynx by staking');

		PoolInfo storage pool = poolInfo[_pid];
		UserInfo storage user = userInfo[_pid][msg.sender];
		updatePool(_pid);
		if (user.amount > 0) {
			uint256 pending = user.amount.mul(pool.accSphynxPerShare).div(1e12).sub(user.rewardDebt);
			if (pending > 0) {
				safeSphynxTransfer(msg.sender, pending);
			}
		}
		if (_amount > 0) {
			pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);
			user.amount = user.amount.add(_amount);
		}
		user.rewardDebt = user.amount.mul(pool.accSphynxPerShare).div(1e12);
		emit Deposit(msg.sender, _pid, _amount);
	}

	// Withdraw LP tokens from MasterChef.
	function withdraw(uint256 _pid, uint256 _amount) public {
		require(_pid != 0, 'withdraw sphynx by unstaking');

		PoolInfo storage pool = poolInfo[_pid];
		UserInfo storage user = userInfo[_pid][msg.sender];
		require(user.amount >= _amount, 'withdraw: not good');
		updatePool(_pid);
		uint256 pending = user.amount.mul(pool.accSphynxPerShare).div(1e12).sub(user.rewardDebt);
		if (pending > 0) {
			safeSphynxTransfer(msg.sender, pending);
		}
		if (_amount > 0) {
			user.amount = user.amount.sub(_amount);
			pool.lpToken.safeTransfer(address(msg.sender), _amount);
		}
		user.rewardDebt = user.amount.mul(pool.accSphynxPerShare).div(1e12);
		emit Withdraw(msg.sender, _pid, _amount);
	}

	// Stake sphynx tokens to MasterChef
	function enterStaking(uint256 _amount) public {
		PoolInfo storage pool = poolInfo[0];
		UserInfo storage user = userInfo[0][msg.sender];
		updatePool(0);
		if (user.amount > 0) {
			uint256 pending = user.amount.mul(pool.accSphynxPerShare).div(1e12).sub(user.rewardDebt);
			if (pending > 0) {
				safeSphynxTransfer(msg.sender, pending);
			}
		}
		if (_amount > 0) {
			pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);
			user.amount = user.amount.add(_amount);
		}
		user.rewardDebt = user.amount.mul(pool.accSphynxPerShare).div(1e12);
		emit Deposit(msg.sender, 0, _amount);
	}

	// Withdraw sphynx tokens from STAKING.
	function leaveStaking(uint256 _amount) public {
		PoolInfo storage pool = poolInfo[0];
		UserInfo storage user = userInfo[0][msg.sender];
		require(user.amount >= _amount, 'withdraw: not good');
		updatePool(0);
		uint256 pending = user.amount.mul(pool.accSphynxPerShare).div(1e12).sub(user.rewardDebt);
		if (pending > 0) {
			safeSphynxTransfer(msg.sender, pending);
		}
		if (_amount > 0) {
			user.amount = user.amount.sub(_amount);
			pool.lpToken.safeTransfer(address(msg.sender), _amount);
		}
		user.rewardDebt = user.amount.mul(pool.accSphynxPerShare).div(1e12);

		emit Withdraw(msg.sender, 0, _amount);
	}

	// Withdraw without caring about rewards. EMERGENCY ONLY.
	function emergencyWithdraw(uint256 _pid) public {
		PoolInfo storage pool = poolInfo[_pid];
		UserInfo storage user = userInfo[_pid][msg.sender];
		pool.lpToken.safeTransfer(address(msg.sender), user.amount);
		emit EmergencyWithdraw(msg.sender, _pid, user.amount);
		user.amount = 0;
		user.rewardDebt = 0;
	}

	// Safe sphynx transfer function, just in case if rounding error causes pool to not have enough sphynxs.
	function safeSphynxTransfer(address _to, uint256 _amount) internal {
		uint256 amount = _amount.mul(toBurn).div(100);
		sphynx.transfer(0x000000000000000000000000000000000000dEaD, amount);
		sphynx.transfer(_to, _amount.sub(amount));
	}

	// Update dev address by the previous dev.
	function dev(address _devaddr) public {
		require(msg.sender == devaddr, 'dev: wut?');
		devaddr = _devaddr;
		emit SetDev(_devaddr);
	}

	// Sphynx has to add hidden dummy pools inorder to alter the emission, here we make it simple and transparent to all.
	function updateEmissionRate(uint256 _perBlock) public onlyOwner {
		massUpdatePools();
		sphynxPerBlock = _perBlock;
	}
}

// File: @sphynxswap/sphynx-swap-lib/contracts/math/SafeMath.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.4.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
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.
        // 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;
    }

    /**
     * @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;
    }

    function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = x < y ? x : y;
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint256 y) internal pure returns (uint256 z) {
        if (y > 3) {
            z = y;
            uint256 x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
}

// File: @sphynxswap/sphynx-swap-lib/contracts/token/BEP20/IBEP20.sol



// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.4.0;

interface IBEP20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the token decimals.
     */
    function decimals() external view returns (uint8);

    /**
     * @dev Returns the token symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the token name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the bep token owner.
     */
    function getOwner() external view returns (address);

    /**
     * @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:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * 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);
}

// File: @sphynxswap/sphynx-swap-lib/contracts/token/BEP20/SafeBEP20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import './IBEP20.sol';
import '../../math/SafeMath.sol';
import '../../utils/Address.sol';

/**
 * @title SafeBEP20
 * @dev Wrappers around BEP20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeBEP20 for IBEP20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeBEP20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(
        IBEP20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IBEP20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IBEP20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IBEP20 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),
            'SafeBEP20: approve from non-zero to non-zero allowance'
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IBEP20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IBEP20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(
            value,
            'SafeBEP20: decreased allowance below zero'
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IBEP20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, 'SafeBEP20: low-level call failed');
        if (returndata.length > 0) {
            // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), 'SafeBEP20: BEP20 operation did not succeed');
        }
    }
}

// File: @sphynxswap/sphynx-swap-lib/contracts/access/Ownable.sol



// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.4.0;

import '../GSN/Context.sol';

/**
 * @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.
 *
 * By default, the owner account will be the one that deploys the contract. 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.
 */
contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() internal {
        address msgSender = _msgSender();
        _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 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 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 onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), 'Ownable: new owner is the zero address');
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: contracts/SphynxToken.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import '@sphynxswap/sphynx-swap-lib/contracts/access/Manageable.sol';
import '@sphynxswap/sphynx-swap-lib/contracts/token/BEP20/BEP20.sol';
import '@sphynxswap/sphynx-swap-lib/contracts/token/BEP20/IBEP20.sol';
import '@sphynxswap/sphynx-swap-lib/contracts/token/BEP20/SafeBEP20.sol';
import '@sphynxswap/swap-core/contracts/interfaces/ISphynxPair.sol';
import '@sphynxswap/swap-core/contracts/interfaces/ISphynxFactory.sol';
import '@sphynxswap/swap-periphery/contracts/interfaces/ISphynxRouter02.sol';

interface AggregatorV3Interface {
	function decimals() external view returns (uint8);

	function description() external view returns (string memory);

	function version() external view returns (uint256);

	// getRoundData and latestRoundData should both raise "No data present"
	// if they do not have data to report, instead of returning unset values
	// which could be misinterpreted as actual reported values.
	function getRoundData(uint80 _roundId)
		external
		view
		returns (
			uint80 roundId,
			int256 answer,
			uint256 startedAt,
			uint256 updatedAt,
			uint80 answeredInRound
		);

	function latestRoundData()
		external
		view
		returns (
			uint80 roundId,
			int256 answer,
			uint256 startedAt,
			uint256 updatedAt,
			uint80 answeredInRound
		);
}

contract SphynxToken is BEP20, Manageable {
	using SafeMath for uint256;
	using SafeBEP20 for IBEP20;

	ISphynxRouter02 public sphynxSwapRouter;
	address public sphynxSwapPair;

	bool private swapping;

	address public masterChef;
	address public sphynxBridge;

	address payable public marketingWallet = payable(0x3D458e65828d031B46579De28e9BBAAeb2729064);
	address payable public developmentWallet = payable(0x7dB8380C7A017F82CC1d2DC7F8F1dE2d29Fd1df6);
	address public lotteryAddress;

	uint256 public usdAmountToSwap = 500;

	uint256 public marketingFee;
	uint256 public developmentFee;
	uint256 public lotteryFee;
	uint256 public totalFees;
	uint256 public blockNumber;

	bool public SwapAndLiquifyEnabled = false;
	bool public sendToLottery = false;
	bool public stopTrade = false;
	bool public claimable = true;
	uint256 public maxTxAmount = 800000000 * (10 ** 18); // Initial Max Tx Amount
	mapping(address => bool) signers;
	mapping(uint256 => address) signersArray;
	mapping(address => bool) stopTradeSign;

	AggregatorV3Interface internal priceFeed;

	// exlcude from fees and max transaction amount
	mapping(address => bool) private _isExcludedFromFees;

	// getting fee addresses
	mapping(address => bool) public _isGetFees;

	// store addresses that are automated market maker pairs. Any transfer to these addresses
	// could be subject to a maximum transfer amount
	mapping(address => bool) public automatedMarketMakerPairs;

	uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

	modifier onlyMasterChefAndBridge() {
		require(msg.sender == masterChef || msg.sender == sphynxBridge, 'Permission Denied');
		_;
	}

	modifier onlySigner() {
		require(signers[msg.sender], 'not-a-signer');
		_;
	}

	modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

	// Contract Events
	event ExcludeFromFees(address indexed account, bool isExcluded);
	event GetFee(address indexed account, bool isGetFee);
	event ExcludeMultipleAccountsFromFees(address[] accounts, bool isExcluded);
	event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);
	event MarketingWalletUpdated(address indexed newMarketingWallet, address indexed oldMarketingWallet);
	event DevelopmentWalletUpdated(address indexed newDevelopmentWallet, address indexed oldDevelopmentWallet);
	event LotteryAddressUpdated(address indexed newLotteryAddress, address indexed oldLotteryAddress);
	event UpdateSphynxSwapRouter(address indexed newAddress, address indexed oldAddress);
	event SwapAndLiquify(uint256 tokensSwapped, uint256 nativeReceived, uint256 tokensIntoLiqudity);
	event UpdateSwapAndLiquify(bool value);
	event UpdateSendToLottery(bool value);
	event SetMarketingFee(uint256 value);
	event SetDevelopmentFee(uint256 value);
	event SetLotteryFee(uint256 value);
	event SetAllFeeToZero(uint256 marketingFee, uint256 developmentFee, uint256 lotteryFee);
	event MaxFees(uint256 marketingFee, uint256 developmentFee, uint256 lotteryFee);
	event SetUsdAmountToSwap(uint256 usdAmountToSwap);
	event SetBlockNumber(uint256 blockNumber);
	event UpdateMasterChef(address masterChef);
	event UpdateSphynxBridge(address sphynxBridge);
	event UpdateMaxTxAmount(uint256 txAmount);

	constructor() public BEP20('Sphynx ETH', 'SPHYNX') {
		uint256 _marketingFee = 5;
		uint256 _developmentFee = 5;
		uint256 _lotteryFee = 1;

		marketingFee = _marketingFee;
		developmentFee = _developmentFee;
		lotteryFee = _lotteryFee;
		totalFees = _marketingFee.add(_developmentFee);
		blockNumber = 0;

		ISphynxRouter02 _sphynxSwapRouter = ISphynxRouter02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D); // mainnet
		// Create a sphynxswap pair for SPHYNX
		address _sphynxSwapPair = ISphynxFactory(_sphynxSwapRouter.factory()).createPair(address(this), _sphynxSwapRouter.WETH());

		sphynxSwapRouter = _sphynxSwapRouter;
		sphynxSwapPair = _sphynxSwapPair;

		_setAutomatedMarketMakerPair(sphynxSwapPair, true);

		// exclude from paying fees or having max transaction amount
		excludeFromFees(marketingWallet, true);
		excludeFromFees(developmentWallet, true);
		excludeFromFees(address(this), true);
		excludeFromFees(owner(), true);

		// set getFee addresses
		_isGetFees[address(_sphynxSwapRouter)] = true;
		_isGetFees[_sphynxSwapPair] = true;
		priceFeed = AggregatorV3Interface(0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419);

		_mint(owner(), 800000000 * (10**18));

		_status = _NOT_ENTERED;

		//multi-sign-wallets
		signers[0x35BfE8dA53F94d6711F111790643D2D403992b56] = true;
		signers[0x96C463B615228981A2c30B842E8A8e4e933CEc46] = true;
		signers[0x7278fC9C49A2B6bd072b9d47E3c903ef0e12bb83] = true;
		signersArray[0] = 0x35BfE8dA53F94d6711F111790643D2D403992b56;
		signersArray[1] = 0x96C463B615228981A2c30B842E8A8e4e933CEc46;
		signersArray[2] = 0x7278fC9C49A2B6bd072b9d47E3c903ef0e12bb83;
	}

	receive() external payable {}

	// mint function for masterchef;
	function mint(address to, uint256 amount) public onlyMasterChefAndBridge {
		_mint(to, amount);
	}

	function updateSwapAndLiquifiy(bool value) public onlyManager {
		SwapAndLiquifyEnabled = value;
		emit UpdateSwapAndLiquify(value);
	}

	function updateSendToLottery(bool value) public onlyManager {
		sendToLottery = value;
		emit UpdateSendToLottery(value);
	}

	function setMarketingFee(uint256 value) external onlyManager {
		require(value <= 5, 'SPHYNX: Invalid marketingFee');
		marketingFee = value;
		totalFees = marketingFee.add(developmentFee);
		emit SetMarketingFee(value);
	}

	function setDevelopmentFee(uint256 value) external onlyManager {
		require(value <= 5, 'SPHYNX: Invalid developmentFee');
		developmentFee = value;
		totalFees = marketingFee.add(developmentFee);
		emit SetDevelopmentFee(value);
	}

	function setLotteryFee(uint256 value) external onlyManager {
		require(value <= 1, 'SPHYNX: Invalid lotteryFee');
		lotteryFee = value;
		emit SetLotteryFee(value);
	}

	function setAllFeeToZero() external onlyOwner {
		marketingFee = 0;
		developmentFee = 0;
		lotteryFee = 0;
		totalFees = 0;
		emit SetAllFeeToZero(marketingFee, developmentFee, lotteryFee);
	}

	function maxFees() external onlyOwner {
		marketingFee = 5;
		developmentFee = 5;
		lotteryFee = 1;
		totalFees = marketingFee.add(developmentFee);
		emit MaxFees(marketingFee, developmentFee, lotteryFee);
	}

	function updateSphynxSwapRouter(address newAddress) public onlyManager {
		require(newAddress != address(sphynxSwapRouter), 'SPHYNX: The router already has that address');
		emit UpdateSphynxSwapRouter(newAddress, address(sphynxSwapRouter));
		sphynxSwapRouter = ISphynxRouter02(newAddress);
		address _sphynxSwapPair;
		_sphynxSwapPair = ISphynxFactory(sphynxSwapRouter.factory()).getPair(address(this), sphynxSwapRouter.WETH());
		if(_sphynxSwapPair == address(0)) {
			_sphynxSwapPair = ISphynxFactory(sphynxSwapRouter.factory()).createPair(address(this), sphynxSwapRouter.WETH());
		}
		_setAutomatedMarketMakerPair(sphynxSwapPair, false);
		sphynxSwapPair = _sphynxSwapPair;
		_setAutomatedMarketMakerPair(sphynxSwapPair, true);
	}

	function updateMasterChef(address _masterChef) public onlyManager {
		require(masterChef != _masterChef, 'SPHYNX: MasterChef already exists!');
		masterChef = _masterChef;
		emit UpdateMasterChef(_masterChef);
	}

	function updateSphynxBridge(address _sphynxBridge) public onlyManager {
		require(sphynxBridge != _sphynxBridge, 'SPHYNX: SphynxBridge already exists!');
		_isExcludedFromFees[sphynxBridge] = false;
		sphynxBridge = _sphynxBridge;
		_isExcludedFromFees[sphynxBridge] = true;
		emit UpdateSphynxBridge(_sphynxBridge);
	}

	function excludeFromFees(address account, bool excluded) public onlyManager {
		require(_isExcludedFromFees[account] != excluded, "SPHYNX: Account is already the value of 'excluded'");
		_isExcludedFromFees[account] = excluded;

		emit ExcludeFromFees(account, excluded);
	}

	function setFeeAccount(address account, bool isGetFee) public onlyManager {
		require(_isGetFees[account] != isGetFee, "SPHYNX: Account is already the value of 'isGetFee'");
		_isGetFees[account] = isGetFee;

		emit GetFee(account, isGetFee);
	}

	function excludeMultipleAccountsFromFees(address[] calldata accounts, bool excluded) public onlyOwner {
		for (uint256 i = 0; i < accounts.length; i++) {
			_isExcludedFromFees[accounts[i]] = excluded;
		}

		emit ExcludeMultipleAccountsFromFees(accounts, excluded);
	}

	function setAutomatedMarketMakerPair(address pair, bool value) public onlyManager {
		_setAutomatedMarketMakerPair(pair, value);
	}

	function _setAutomatedMarketMakerPair(address pair, bool value) private {
		require(automatedMarketMakerPairs[pair] != value, 'SPHYNX: Automated market maker pair is already set to that value');
		automatedMarketMakerPairs[pair] = value;

		emit SetAutomatedMarketMakerPair(pair, value);
	}

	function setUsdAmountToSwap(uint256 _usdAmount) public onlyManager {
		usdAmountToSwap = _usdAmount;
		emit SetUsdAmountToSwap(usdAmountToSwap);
	}

	function updateMarketingWallet(address newMarketingWallet) public onlyManager {
		require(newMarketingWallet != marketingWallet, 'SPHYNX: The marketing wallet is already this address');
		excludeFromFees(newMarketingWallet, true);
		excludeFromFees(marketingWallet, false);
		emit MarketingWalletUpdated(newMarketingWallet, marketingWallet);
		marketingWallet = payable(newMarketingWallet);
	}

	function updateDevelopmentgWallet(address newDevelopmentWallet) public onlyManager {
		require(newDevelopmentWallet != developmentWallet, 'SPHYNX: The development wallet is already this address');
		excludeFromFees(newDevelopmentWallet, true);
		excludeFromFees(developmentWallet, false);
		emit DevelopmentWalletUpdated(newDevelopmentWallet, developmentWallet);
		developmentWallet = payable(newDevelopmentWallet);
	}

	function updateLotteryAddress(address newLotteryAddress) public onlyManager {
		require(newLotteryAddress != lotteryAddress, 'SPHYNX: The lottery wallet is already this address');
		excludeFromFees(newLotteryAddress, true);
		excludeFromFees(lotteryAddress, false);
		emit LotteryAddressUpdated(newLotteryAddress, lotteryAddress);
		lotteryAddress = newLotteryAddress;
	}

	function setBlockNumber() public onlyOwner {
		blockNumber = block.number;
		emit SetBlockNumber(blockNumber);
	}

	function updateMaxTxAmount(uint256 _amount) public onlyManager {
		maxTxAmount = _amount;
		emit UpdateMaxTxAmount(_amount);
	}

	function updateTokenClaim(bool _claim) public onlyManager {
		claimable = _claim;
	}

	function updateStopTrade(bool _value) external onlySigner {
		require(stopTrade != _value, 'already-set');
		require(!stopTradeSign[msg.sender], 'already-sign');
		stopTradeSign[msg.sender] = true;
        if (
            stopTradeSign[signersArray[0]] &&
            stopTradeSign[signersArray[1]] &&
            stopTradeSign[signersArray[2]]
        ) {
			stopTrade = _value;
			stopTradeSign[signersArray[0]] = false;
			stopTradeSign[signersArray[1]] = false;
			stopTradeSign[signersArray[2]] = false;
		}
	}

	function updateSignerWallet(address _signer) external onlySigner {
		signers[msg.sender] = false;
		signers[_signer] = true;
		for(uint i = 0; i < 3; i++) {
			if(signersArray[i] == msg.sender) {
				signersArray[i] = _signer;
			}
		}
	}

	function isExcludedFromFees(address account) public view returns (bool) {
		return _isExcludedFromFees[account];
	}

	function _transfer(
		address from,
		address to,
		uint256 amount
	) internal override {
		require(from != address(0), 'BEP20: transfer from the zero address');
		require(to != address(0), 'BEP20: transfer to the zero address');
		require(!stopTrade, 'trade-stopped');
		require(amount <= maxTxAmount, 'max-tx-amount-overflow');

		if (amount == 0) {
			super._transfer(from, to, 0);
			return;
		}

        if(SwapAndLiquifyEnabled) {
            uint256 contractTokenBalance = balanceOf(address(this));
            uint256 nativeTokenAmount = _getTokenAmountFromNative();

		    bool canSwap = contractTokenBalance >= nativeTokenAmount;

            if (canSwap && !swapping && !automatedMarketMakerPairs[from]) {
                swapping = true;

                // Set number of tokens to sell to nativeTokenAmount
                contractTokenBalance = nativeTokenAmount;
                swapTokens(contractTokenBalance);
                swapping = false;
            }
        }

		// indicates if fee should be deducted from transfer
		bool takeFee = true;

		// if any account belongs to _isExcludedFromFee account then remove the fee
		if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
			takeFee = false;
		}

		if (takeFee) {
			if (block.number - blockNumber <= 10) {
				uint256 afterBalance = balanceOf(to) + amount;
				require(afterBalance <= 250000 * (10**18), 'Owned amount exceeds the maxOwnedAmount');
			}
			uint256 fees;
			if (_isGetFees[from] || _isGetFees[to]) {
				if (block.number - blockNumber <= 5) {
					fees = amount.mul(99).div(10**2);
				} else {
					fees = amount.mul(totalFees).div(10**2);
					if (sendToLottery) {
						uint256 lotteryAmount = amount.mul(lotteryFee).div(10**2);
						amount = amount.sub(lotteryAmount);
						super._transfer(from, lotteryAddress, lotteryAmount);
					}
				}

				amount = amount.sub(fees);
				super._transfer(from, address(this), fees);
			}
		}

		super._transfer(from, to, amount);
	}

	function swapTokens(uint256 tokenAmount) private {
		swapTokensForNative(tokenAmount);
		uint256 swappedNative = address(this).balance;
		uint256 marketingNative = swappedNative.mul(marketingFee).div(totalFees);
		uint256 developmentNative = swappedNative.sub(marketingNative);
		transferNativeToMarketingWallet(marketingNative);
		transferNativeToDevelopmentWallet(developmentNative);
	}

	// Swap tokens on PacakeSwap
	function swapTokensForNative(uint256 tokenAmount) private {
		// generate the sphynxswap pair path of token -> WETH
		address[] memory path = new address[](2);
		path[0] = address(this);
		path[1] = sphynxSwapRouter.WETH();

		_approve(address(this), address(sphynxSwapRouter), tokenAmount);

		// make the swap
		sphynxSwapRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
			tokenAmount,
			0, // accept any amount of Native
			path,
			address(this),
			block.timestamp
		);
	}

	function getNativeAmountFromUSD() public view returns (uint256 amount) {
		(
            uint80 roundID, 
            int price,
            uint startedAt,
            uint timeStamp,
            uint80 answeredInRound
        ) = priceFeed.latestRoundData();
        amount = usdAmountToSwap.mul(10 ** 26).div(uint256(price));
	}

	function _getTokenAmountFromNative() internal view returns (uint256) {
		uint256 tokenAmount;
		address[] memory path = new address[](2);
		path[0] = sphynxSwapRouter.WETH();
		path[1] = address(this);

		uint256 nativeAmountToSwap = getNativeAmountFromUSD();
		uint256[] memory amounts = sphynxSwapRouter.getAmountsOut(nativeAmountToSwap, path);
		tokenAmount = amounts[1];
		return tokenAmount;
	}

	function transferNativeToMarketingWallet(uint256 amount) private {
		marketingWallet.transfer(amount);
	}

	function transferNativeToDevelopmentWallet(uint256 amount) private {
		developmentWallet.transfer(amount);
	}
}
// File: @sphynxswap/sphynx-swap-lib/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            codehash := extcodehash(account)
        }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    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');
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, 'Address: low-level call failed');
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    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');
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    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);
            }
        }
    }
}

// File: @sphynxswap/sphynx-swap-lib/contracts/GSN/Context.sol



// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.4.0;

/*
 * @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 GSN 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.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor() internal {}

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: @sphynxswap/sphynx-swap-lib/contracts/access/Manageable.sol



// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.4.0;

import '../GSN/Context.sol';

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an manager) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the manager account will be the one that deploys the contract. This
 * can later be changed with {transferManagement}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyManager`, which can be applied to your functions to restrict their use to
 * the manager.
 */
contract Manageable is Context {
    address private _manager;

    event ManagementTransferred(address indexed previousManager, address indexed newManager);

    /**
     * @dev Initializes the contract setting the deployer as the initial manager.
     */
    constructor() internal {
        address msgSender = _msgSender();
        _manager = msgSender;
        emit ManagementTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the manager.
     */
    modifier onlyManager() {
        require(_manager == _msgSender(), 'Manageable: caller is not the manager');
        _;
    }

    /**
     * @dev Leaves the contract without manager. It will not be possible to call
     * `onlyManager` functions anymore. Can only be called by the current manager.
     *
     * NOTE: Renouncing management will leave the contract without an manager,
     * thereby removing any functionality that is only available to the manager.
     */
    function renounceManagement() public onlyManager {
        emit ManagementTransferred(_manager, address(0));
        _manager = address(0);
    }

    /**
     * @dev Transfers management of the contract to a new account (`newManager`).
     * Can only be called by the current manager.
     */
    function transferManagement(address newManager) public onlyManager {
        _transferManagement(newManager);
    }

    /**
     * @dev Transfers management of the contract to a new account (`newManager`).
     */
    function _transferManagement(address newManager) internal {
        require(newManager != address(0), 'Manageable: new manager is the zero address');
        emit ManagementTransferred(_manager, newManager);
        _manager = newManager;
    }
}

// File: @sphynxswap/sphynx-swap-lib/contracts/token/BEP20/BEP20.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.4.0;

import '../../access/Ownable.sol';
import '../../GSN/Context.sol';
import './IBEP20.sol';
import '../../math/SafeMath.sol';
import '../../utils/Address.sol';

/**
 * @dev Implementation of the {IBEP20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {BEP20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-BEP20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of BEP20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IBEP20-approve}.
 */
contract BEP20 is Context, IBEP20, Ownable {
    using SafeMath for uint256;
    using Address for address;

    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }

    /**
     * @dev Returns the bep token owner.
     */
    function getOwner() external override view returns (address) {
        return owner();
    }

    /**
     * @dev Returns the token name.
     */
    function name() public override view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the token decimals.
     */
    function decimals() public override view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev Returns the token symbol.
     */
    function symbol() public override view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {BEP20-totalSupply}.
     */
    function totalSupply() public override view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {BEP20-balanceOf}.
     */
    function balanceOf(address account) public override view returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {BEP20-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 override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {BEP20-allowance}.
     */
    function allowance(address owner, address spender) public override view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {BEP20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {BEP20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {BEP20};
     *
     * 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 override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()].sub(amount, 'BEP20: 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 {BEP20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public 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 {BEP20-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 returns (bool) {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender].sub(subtractedValue, 'BEP20: decreased allowance below zero')
        );
        return true;
    }

    /**
     * @dev Creates `amount` tokens and assigns them to `msg.sender`, increasing
     * the total supply.
     *
     * Requirements
     *
     * - `msg.sender` must be the token owner
     */
    function mint(uint256 amount) public onlyOwner returns (bool) {
        _mint(_msgSender(), amount);
        return true;
    }

    /**
     * @dev Destroys `amount` tokens from `msg.sender`, decreasing the total supply.
     *
     */
    function burn(uint256 amount) public returns (bool) {
        _burn(_msgSender(), amount);
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), 'BEP20: transfer from the zero address');
        require(recipient != address(0), 'BEP20: transfer to the zero address');

        _balances[sender] = _balances[sender].sub(amount, 'BEP20: transfer amount exceeds balance');
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @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 _mint(address account, uint256 amount) internal {
        require(account != address(0), 'BEP20: mint to the zero address');

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        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 {
        require(account != address(0), 'BEP20: burn from the zero address');

        _balances[account] = _balances[account].sub(amount, 'BEP20: 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 is 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 {
        require(owner != address(0), 'BEP20: approve from the zero address');
        require(spender != address(0), 'BEP20: approve to the zero address');

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See {_burn} and {_approve}.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(
            account,
            _msgSender(),
            _allowances[account][_msgSender()].sub(amount, 'BEP20: burn amount exceeds allowance')
        );
    }
}

// File: @sphynxswap/swap-core/contracts/interfaces/ISphynxPair.sol



pragma solidity >=0.5.0;

interface ISphynxPair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint 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 (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint 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 (uint);

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

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

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    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 (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);
    function swapFee() external view returns (uint32);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
    function setSwapFee(uint32) external;
}

// File: @sphynxswap/swap-core/contracts/interfaces/ISphynxFactory.sol



pragma solidity >=0.5.0;

interface ISphynxFactory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    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(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

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

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
    function setSwapFee(address _pair, uint32 _swapFee) external;
}

// File: @sphynxswap/swap-periphery/contracts/interfaces/ISphynxRouter02.sol



pragma solidity >=0.6.2;

import './ISphynxRouter01.sol';

interface ISphynxRouter02 is ISphynxRouter01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

// File: @sphynxswap/swap-periphery/contracts/interfaces/ISphynxRouter01.sol



pragma solidity >=0.6.2;

interface ISphynxRouter01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut, uint swapFee) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut, uint swapFee) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}