// File: contracts/LPStaking.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;


import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./Rena.sol";
import "./interfaces/IClaim.sol";

// Have fun reading it. Hopefully it's bug-free. God bless.
// CoreVault Fork
contract LPStaking is Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    // Info of each user.
    struct UserInfo {
        uint256 amount; // How many  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 RENAs
        // entitled to a user but is pending to be distributed is:
        //
        //   pending reward = (user.amount * pool.accRENAPerShare) - user.rewardDebt
        //
        // Whenever a user deposits or withdraws  tokens to a pool. Here's what happens:
        //   1. The pool's `accRENAPerShare` (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 {
        IERC20 token; // Address of  token contract.
        uint256 allocPoint; // How many allocation points assigned to this pool. RENAs to distribute per block.
        uint256 accRewardPerShare; // Accumulated reward per share, times 1e12. See below.
        bool withdrawable; // Is this pool withdrawable?
        
    }
    mapping(uint256 => mapping(address => mapping(address => uint256))) allowance;

    Rena public rena;

    // Dev address.
    address public devaddr;

    // Info of each pool.
    PoolInfo[] public poolInfo;
    // Info of each user that stakes  tokens.
    mapping(uint256 => mapping(address => UserInfo)) public userInfo;
    // Total allocation points. Must be the sum of all allocation points in all pools.
    uint256 public totalAllocPoint;

    //// pending rewards awaiting anyone to massUpdate
    uint256 public pendingRewards;

    uint256 public contractStartBlock;
    uint256 public epochCalculationStartBlock;
    uint256 public cumulativeRewardsSinceStart;
    uint256 public rewardsInThisEpoch;

    uint public epoch;

    // Returns fees generated since start of this contract
    function averageFeesPerBlockSinceStart() external view returns (uint averagePerBlock) {
        averagePerBlock = cumulativeRewardsSinceStart.add(rewardsInThisEpoch).div(block.number.sub(contractStartBlock));
    }        

    // Returns averge fees in this epoch
    function averageFeesPerBlockEpoch() external view returns (uint256 averagePerBlock) {
        averagePerBlock = rewardsInThisEpoch.div(block.number.sub(epochCalculationStartBlock));
    }

    // For easy graphing historical epoch rewards
    mapping(uint => uint256) public epochRewards;

    //Starts a new calculation epoch
    // Because averge since start will not be accurate
    function startNewEpoch() public {
        require(epochCalculationStartBlock + 50000 < block.number, "New epoch not ready yet"); // About a week
        epochRewards[epoch] = rewardsInThisEpoch;
        cumulativeRewardsSinceStart = cumulativeRewardsSinceStart.add(rewardsInThisEpoch);
        rewardsInThisEpoch = 0;
        epochCalculationStartBlock = block.number;
        ++epoch;
    }

    event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
    event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
    event Claim(address indexed user, uint256 indexed pid);
    event EmergencyWithdraw(
        address indexed user,
        uint256 indexed pid,
        uint256 amount
    );
    event Approval(address indexed owner, address indexed spender, uint256 _pid, uint256 value);


    function initialize(
        address _rena
    ) public {
        require(address(rena) == address(0), "Only once");
        DEV_FEE = 200; // 2%
        rena = Rena(_rena);
        devaddr = msg.sender;
        contractStartBlock = block.number;
        _superAdmin = msg.sender;
    }

    function poolLength() external view returns (uint256) {
        return poolInfo.length;
    }

    // Add a new token pool. Can only be called by the owner. 
    // Note contract owner is meant to be a governance contract allowing RENA governance consensus
    function addPool(
        uint256 _allocPoint,
        IERC20 _token,
        bool _withUpdate,
        bool _withdrawable
    ) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }

        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            require(poolInfo[pid].token != _token,"Error pool already added");
        }

        totalAllocPoint = totalAllocPoint.add(_allocPoint);

        poolInfo.push(
            PoolInfo({
                token: _token,
                allocPoint: _allocPoint,
                accRewardPerShare: 0,
                withdrawable : _withdrawable
            })
        );
    }

    
    // Update the given pool's Rena allocation point. Can only be called by the owner.
        // Note contract owner is meant to be a governance contract allowing RENA governance consensus
    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;
    }

    // Update the given pool's ability to withdraw tokens
    // Note contract owner is meant to be a governance contract allowing RENA governance consensus
    function setPoolWithdrawable(
        uint256 _pid,
        bool _withdrawable
    ) public onlyOwner {
        poolInfo[_pid].withdrawable = _withdrawable;
    }

    // Sets the dev fee for this contract
    // Note contract owner is meant to be a governance contract allowing RENA governance consensus
    uint16 DEV_FEE;
    function setDevFee(uint16 _DEV_FEE) public onlyOwner {
        require(_DEV_FEE <= 1000, 'Dev fee clamped at 10%');
        DEV_FEE = _DEV_FEE;
    }
    uint256 pending_DEV_rewards;


    // View function to see pending RENAs on frontend.
    function pendingrena(uint256 _pid, address _user)
        public
        view
        returns (uint256)
    {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];
        uint256 accRewardPerShare = pool.accRewardPerShare;

        return user.amount.mul(accRewardPerShare).div(1e12).sub(user.rewardDebt);
    }
    function poolAmount(uint256 _pid, address _user) public view returns (uint256) {
        return userInfo[_pid][_user].amount;
    }

    // Update reward vairables for all pools. Be careful of gas spending!
    function massUpdatePools() public {
        uint256 length = poolInfo.length;
        uint allRewards;
        for (uint256 pid = 0; pid < length; ++pid) {
            allRewards = allRewards.add(updatePool(pid));
        }

        pendingRewards = pendingRewards.sub(allRewards);
    }

    // ----
    // Function that adds pending rewards, called by the Rena token.
    // ----
    uint256 private renaBalance;
    function addPendingRewards() public {
        uint256 newRewards = rena.balanceOf(address(this)).sub(renaBalance);
        
        if(newRewards > 0) {
            renaBalance = rena.balanceOf(address(this)); // If there is no change the balance didn't change
            pendingRewards = pendingRewards.add(newRewards);
            rewardsInThisEpoch = rewardsInThisEpoch.add(newRewards);
        }
    }

    // Update reward variables of the given pool to be up-to-date.
    function updatePool(uint256 _pid) internal returns (uint256 renaRewardWhole) {
        PoolInfo storage pool = poolInfo[_pid];

        uint256 tokenSupply = pool.token.balanceOf(address(this));
        if (tokenSupply == 0) { // avoids division by 0 errors
            return 0;
        }
        renaRewardWhole = pendingRewards // Multiplies pending rewards by allocation point of this pool and then total allocation
            .mul(pool.allocPoint)        // getting the percent of total pending rewards this pool should get
            .div(totalAllocPoint);       // we can do this because pools are only mass updated
        uint256 renaRewardFee = renaRewardWhole.mul(DEV_FEE).div(10000);
        uint256 renaRewardToDistribute = renaRewardWhole.sub(renaRewardFee);

        pending_DEV_rewards = pending_DEV_rewards.add(renaRewardFee);

        pool.accRewardPerShare = pool.accRewardPerShare.add(
            renaRewardToDistribute.mul(1e12).div(tokenSupply)
        );

    }

    // Deposit  tokens to RenaVault for rena allocation.
    function deposit(uint256 _pid, uint256 _amount) public {

        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];

        massUpdatePools();
        
        // Transfer pending tokens
        // to user
        updateAndPayOutPending(_pid, msg.sender);
        //Transfer in the amounts from user
        // save gas
        if(_amount > 0) {
            pool.token.safeTransferFrom(address(msg.sender), address(this), _amount);
            user.amount = user.amount.add(_amount);
        }


        user.rewardDebt = user.amount.mul(pool.accRewardPerShare).div(1e12);
        emit Deposit(msg.sender, _pid, _amount);
    }

    // Test coverage
    // [ ] Does user get the deposited amounts?
    // [ ] Does user that its deposited for update correcty?
    // [ ] Does the depositor get their tokens decreased
    function depositFor(address depositFor_, uint256 _pid, uint256 _amount) public {
        // requires no allowances
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][depositFor_];

        massUpdatePools();
        
        // Transfer pending tokens
        // to user
        updateAndPayOutPending(_pid, depositFor_); // Update the balances of person that amount is being deposited for

        if(_amount > 0) {
            pool.token.safeTransferFrom(address(msg.sender), address(this), _amount);
            user.amount = user.amount.add(_amount); // This is depositedFor address
        }

        user.rewardDebt = user.amount.mul(pool.accRewardPerShare).div(1e12); /// This is deposited for address
        emit Deposit(depositFor_, _pid, _amount);

    }

    // Test coverage
    // [ ] Does allowance update correctly?
    function setAllowanceForPoolToken(address spender, uint256 _pid, uint256 value) public {
        require(_pid < poolInfo.length, "pool doesnt exist");
        allowance[_pid][msg.sender][spender] = value;
        emit Approval(msg.sender, spender, _pid, value);
    }

    function hasAllowanceForPoolToken(address spender, uint256 _pid, uint256 value, address _user) external view returns(bool) {
        require(_pid < poolInfo.length, "pool doesnt exist");
        return allowance[_pid][_user][spender] >= value;
    }

    // Test coverage
    // [ ] Does allowance decrease?
    // [ ] Do you need allowance
    // [ ] Withdraws to correct address
    function withdrawFrom(address owner, uint256 _pid, uint256 _amount) public  {
        require(_pid < poolInfo.length, "pool doesnt exist");
        require(allowance[_pid][owner][msg.sender] >= _amount, "withdraw: insufficient allowance");
        allowance[_pid][owner][msg.sender] = allowance[_pid][owner][msg.sender].sub(_amount);
        _withdraw(_pid, _amount, owner, msg.sender);

    }

    function withdrawFromTo(address owner, uint256 _pid, uint256 _amount, address _to) public  {
        require(_pid < poolInfo.length, "pool doesnt exist");
        require(allowance[_pid][owner][msg.sender] >= _amount, "withdraw: insufficient allowance");
        allowance[_pid][owner][msg.sender] = allowance[_pid][owner][msg.sender].sub(_amount);
        _withdraw(_pid, _amount, owner, _to);
    }    

    // Withdraw  tokens from RenaVault.
    function claim(address _from, uint256 _pid) external {
        require(msg.sender == rena.claim(), "Only Claim can claim");
        PoolInfo storage pool = poolInfo[_pid];
        require(pool.withdrawable, "Withdrawing from this pool is disabled");
        UserInfo storage user = userInfo[_pid][_from];
        require(user.amount > 0, "withdraw: not good");

        massUpdatePools();
        updateAndPayOutPending(_pid, _from); // Update balances of from this is not withdrawal but claiming RENA farmed
        user.rewardDebt = user.amount.mul(pool.accRewardPerShare).div(1e12);

        emit Claim(_from, _pid);
    }

    function withdraw(uint256 _pid, uint256 _amount) public {
        _withdraw(_pid, _amount, msg.sender, msg.sender);
    }

    // Low level withdraw function
    function _withdraw(uint256 _pid, uint256 _amount, address from, address to) internal {
        PoolInfo storage pool = poolInfo[_pid];
        require(pool.withdrawable, "Withdrawing from this pool is disabled");
        UserInfo storage user = userInfo[_pid][from];
        require(user.amount >= _amount, "withdraw: not good");
        massUpdatePools();
        updateAndPayOutPending(_pid, from); // Update balances of from this is not withdrawal but claiming RENA farmed

        if(_amount > 0) {
            user.amount = user.amount.sub(_amount);
            pool.token.safeTransfer(address(to), _amount);
        }
        user.rewardDebt = user.amount.mul(pool.accRewardPerShare).div(1e12);

        emit Withdraw(to, _pid, _amount);
    }

    function updateAndPayOutPending(uint256 _pid, address _from) internal {
        uint256 pending_ = pendingrena(_pid, _from);

        if(pending_ > 0) {
            safeClaimTransfer(_from, pending_);
        }

    }

    // function that lets owner/governance contract
    // approve allowance for any token inside this contract
    // This means all future UNI like airdrops are covered
    // And at the same time allows us to give allowance to strategy contracts.
    // Upcoming cYFI etc vaults strategy contracts will  se this function to manage and farm yield on value locked
    function setStrategyContractOrDistributionContractAllowance(address tokenAddress, uint256 _amount, address contractAddress) public onlySuperAdmin {
        require(isContract(contractAddress), "Recipent is not a smart contract, BAD");
        IERC20(tokenAddress).approve(contractAddress, _amount);
    }

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

    // Withdraw without caring about rewards. EMERGENCY ONLY.
    // !Caution this will remove all your pending rewards!
    function emergencyWithdraw(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        require(pool.withdrawable, "Withdrawing from this pool is disabled");
        UserInfo storage user = userInfo[_pid][msg.sender];
        pool.token.safeTransfer(address(msg.sender), user.amount);
        emit EmergencyWithdraw(msg.sender, _pid, user.amount);
        user.amount = 0;
        user.rewardDebt = 0;
        // No mass update dont update pending rewards
    }
    function safeClaimTransfer(address _to, uint256 _amount) internal {
        uint256 renaBal = rena.balanceOf(address(this));
        if (_amount > renaBal) {
            rena.transfer(rena.claim(), renaBal);
            IClaim(rena.claim()).setClaim( _to, renaBal);
            renaBalance = rena.balanceOf(address(this));
        } else {
            rena.transfer(rena.claim(), _amount);
            IClaim(rena.claim()).setClaim( _to, _amount);
            renaBalance = rena.balanceOf(address(this));
        }
        //Avoids possible recursion loop
        // proxy?
        transferDevFee();
    }
    // Safe Rena transfer function, just in case if rounding error causes pool to not have enough RENAs.
    function safeRenaTransfer(address _to, uint256 _amount) internal {

        uint256 renaBal = rena.balanceOf(address(this));

        if (_amount > renaBal) {
            rena.transfer(_to, renaBal);
            renaBalance = rena.balanceOf(address(this));
        } else {
            rena.transfer(_to, _amount);
            renaBalance = rena.balanceOf(address(this));
        }
        //Avoids possible recursion loop
        // proxy?
        transferDevFee();
    }


    function transferDevFee() public {
        if(pending_DEV_rewards == 0) return;
        uint256 renaBal = rena.balanceOf(address(this));
        if (pending_DEV_rewards > renaBal) {
            rena.transfer(devaddr, renaBal);
            renaBalance = rena.balanceOf(address(this));
        } else {
            rena.transfer(devaddr, pending_DEV_rewards);
            renaBalance = rena.balanceOf(address(this));
        }
        pending_DEV_rewards = 0;
    }

    // Update dev address by the previous dev.
    function setDevFeeReciever(address _devaddr) public onlyOwner {
        devaddr = _devaddr;
    }

    address private _superAdmin;

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



    /**
     * @dev Returns the address of the current super admin
     */
    function superAdmin() public view returns (address) {
        return _superAdmin;
    }

    /**
     * @dev Throws if called by any account other than the superAdmin
     */
    modifier onlySuperAdmin() {
        require(_superAdmin == _msgSender(), "Super admin : caller is not super admin.");
        _;
    }

    // Assisns super admint to address 0, making it unreachable forever
    function burnSuperAdmin() public virtual onlySuperAdmin {
        emit SuperAdminTransfered(_superAdmin, address(0));
        _superAdmin = address(0);
    }

    // Super admin can transfer its powers to another address
    function newSuperAdmin(address newOwner) public virtual onlySuperAdmin {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit SuperAdminTransfered(_superAdmin, newOwner);
        _superAdmin = newOwner;
    }
}
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * 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: @openzeppelin/contracts/token/ERC20/SafeERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 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 SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 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(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: 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(IERC20 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, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: @openzeppelin/contracts/math/SafeMath.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @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, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @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) {
        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, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * 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);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/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.
 */
abstract 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 virtual 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 virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: contracts/Rena.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;

import '@openzeppelin/contracts/token/ERC20/ERC20.sol';
import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/utils/ReentrancyGuard.sol';
import './dependencies/uniswap-v2-periphery/contracts/dependencies/uniswap-v2-core/contracts/interfaces/IUniswapV2Pair.sol';
import './dependencies/uniswap-v2-periphery/contracts/dependencies/uniswap-v2-core/contracts/interfaces/IUniswapV2Factory.sol';
import './dependencies/uniswap-v2-periphery/contracts/interfaces/IUniswapV2Router02.sol';

import './interfaces/IRebalancer.sol';
import './interfaces/ILPStaking.sol';

contract Rena is ERC20("Rena", "RENA"), Ownable, ReentrancyGuard {
    using SafeMath for uint256;

    //Needed Addresses
    address public WETH;
    address public renaRouter;
    address public uniRouter;
    address public uniFactory;
    address public uniPair;
    address public renaFactory;

    address payable public treasury;

    //Objects
    address payable public rebalancer;
    address public feeDistributor;
    address public claim;
    address public lpStaking;

    //Fee Divisors
    uint16 public feeDivisor;
    uint16 public callerRewardDivisor;
    uint16 public rebalancerDivisor;

    //Map toggles
    mapping(address => bool) feeless;

    //Overflow protected
    uint256 public minimumRebalanceAmount;
    uint256 public lastRebalance;
    uint256 public rebalanceInterval;

    constructor (
        address renaRouter_,
        address uniRouter_,
        uint256 minimumReblanceAmount_,
        uint256 rebalanceInterval_
        ) {
        treasury = msg.sender;

        feeDivisor = 100;
        callerRewardDivisor = 40;
        rebalancerDivisor = 200;

        minimumRebalanceAmount = minimumReblanceAmount_;

        renaRouter = renaRouter_;
        uniRouter = uniRouter_;
        WETH = IUniswapV2Router02(uniRouter).WETH();
        uniFactory = IUniswapV2Router02(uniRouter).factory();
        uniPair = IUniswapV2Factory(uniFactory).createPair(address(this), WETH);
        
        feeless[address(this)] = true;
        feeless[msg.sender] = true;

        lastRebalance = block.timestamp;
        rebalanceInterval = rebalanceInterval_;

        _mint(msg.sender, 11000000 * 1e18);
    }


    function _transfer(address from, address to, uint256 amount) internal override {
        if(feeDivisor > 0 && feeless[from] == false && feeless[to] == false) {
            uint256 feeAmount = amount.div(feeDivisor);
            super._transfer(from, address(feeDistributor), feeAmount);
            super._transfer(from, to, amount.sub(feeAmount));
        }
        else {
            super._transfer(from, to, amount);
        }
    }

    function toggleFeeless(address addr_) external onlyOwner {
        feeless[addr_] = !feeless[addr_];
    }

    function changeRebalanceInterval(uint256 interval_) external onlyOwner {
        rebalanceInterval = interval_;
    }


    function changeFeeDivisor(uint16 feeDivisor_) external onlyOwner {
        require(feeDivisor_ >= 10, "Must not be greater than 10% total fee");
        feeDivisor = feeDivisor_;
    }

    function changeCallerRewardDivisor(uint16 callerRewardDivisor_) external onlyOwner {
        require(callerRewardDivisor_ >= 10, "Must not be greater than 10% total");
        callerRewardDivisor = callerRewardDivisor_;
    }
    
    function changeMinRebalancerAmount(uint256 minimumRebalanceAmount_) external onlyOwner {
        require(minimumRebalanceAmount_ >= 1, "Must be greater than 1");
        minimumRebalanceAmount = minimumRebalanceAmount_;
    }

    function changeRebalalncerDivisor(uint16 rebalancerDivisor_) external onlyOwner {
        require(rebalancerDivisor_ >= 10, "Must not be greater than 10% total");
        rebalancerDivisor = rebalancerDivisor_;
    }

    function setUniRouter(address uniRouter_) external onlyOwner {
        uniRouter = uniRouter_;
        uniFactory = IUniswapV2Router02(uniRouter).factory();
        WETH = IUniswapV2Router02(uniRouter).WETH();
        uniPair = IUniswapV2Factory(uniFactory).getPair(WETH, address(this));
        if( uniPair == address(0))
            uniPair = IUniswapV2Factory(uniFactory).createPair(address(this), WETH);
    }

    function setRenaRouter(address renaRouter_) external onlyOwner {
        renaRouter = renaRouter_;
        renaFactory = IUniswapV2Router02(renaRouter).factory();
        feeless[renaRouter_] = true;
    }
    

    function setRebalancer(address payable rebalancer_) external onlyOwner {
        rebalancer = rebalancer_;
        feeless[rebalancer_] = true;
    }

    function setClaim(address claim_) external onlyOwner {
        claim = claim_;
        feeless[claim_] = true;
    }

    function setlpStaking(address lpStaking_) external onlyOwner {
        lpStaking = lpStaking_;
        feeless[lpStaking_] = true;
    }

    function setFeeDistributor(address payable feeDistributor_) external onlyOwner {
        feeDistributor = feeDistributor_;
        feeless[feeDistributor_] = true;
    }

    function rebalance() external nonReentrant {
        require(balanceOf(msg.sender) > minimumRebalanceAmount, "You aren't part of the syndicate");
        require(block.timestamp > lastRebalance + rebalanceInterval, "Too Soon");
        lastRebalance = block.timestamp;

        IRebalancer(rebalancer).rebalance(callerRewardDivisor, rebalancerDivisor);
    }
}

// File: contracts/interfaces/IClaim.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;

interface IClaim {
    function claim(uint256 requested_) external payable;
    function setClaim(address _from, uint256 _amount) external;
}
// File: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @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) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

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

    /**
     * @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");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        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: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../../utils/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";

/**
 * @dev Implementation of the {IERC20} 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 {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-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 ERC20 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 {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

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

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

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

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

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

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

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

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

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

    /**
     * @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), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @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 virtual {
        require(account != address(0), "ERC20: mint to the zero address");

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

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

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

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

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

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

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

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

// File: @openzeppelin/contracts/utils/ReentrancyGuard.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    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;
    }
}

// File: contracts/dependencies/uniswap-v2-periphery/contracts/dependencies/uniswap-v2-core/contracts/interfaces/IUniswapV2Pair.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;

import "./IUniswapV2ERC20.sol";

interface IUniswapV2Pair is IUniswapV2ERC20 {
    // event Approval(address indexed owner, address indexed spender, uint value);
    // event Transfer(address indexed from, address indexed to, uint value);

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

    // 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;

    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 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;
}

// File: contracts/dependencies/uniswap-v2-periphery/contracts/dependencies/uniswap-v2-core/contracts/interfaces/IUniswapV2Factory.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;

interface IUniswapV2Factory {
    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;
}

// File: contracts/dependencies/uniswap-v2-periphery/contracts/interfaces/IUniswapV2Router02.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;

import './IUniswapV2Router01.sol';

interface IUniswapV2Router02 is IUniswapV2Router01 {
    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: contracts/interfaces/IRebalancer.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;

interface IRebalancer {
    function rebalance(uint16 callerRewardDivisor, uint16 rebalanceDivisor) external;
    function refill() payable external;
}
// File: contracts/interfaces/ILPStaking.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;

interface ILPStaking {
    function withdrawFromTo(address owner, uint256 _pid, uint256 _amount, address _to) external;
    function claim(address _from, uint256 _pid) external;
    function pendingrena(uint256 pid_, address account_) external view returns(uint256);
    function addPendingRewards() external;
    function massUpdatePools() external;      
}
// File: contracts/dependencies/uniswap-v2-periphery/contracts/dependencies/uniswap-v2-core/contracts/interfaces/IUniswapV2ERC20.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;

interface IUniswapV2ERC20 {
    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;
}

// File: contracts/dependencies/uniswap-v2-periphery/contracts/interfaces/IUniswapV2Router01.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;

interface IUniswapV2Router01 {
    function factory() external view returns (address);
    function WETH() external view 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) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) 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);
}