// File: /Users/akshaycm/Documents/rfits-token/contracts/abstractions/Balancer.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.8;
import { Ownable, SafeMath } from '../interfaces/CommonImports.sol';
import { IERC20Burnable } from '../interfaces/IERC20Burnable.sol';
import '../interfaces/IUniswapV2Router02.sol';
import '../interfaces/IBalancer.sol';

interface IFreeFromUpTo {
    function freeFromUpTo(address from, uint256 value) external returns (uint256 freed);
    function balanceOf(address account) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
}

contract BalancerNewCHI is Ownable, IBalancer {
    using SafeMath for uint256;

    address internal UniRouter = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    address internal burnAddr = 0x000000000000000000000000000000000000dEaD;
    IFreeFromUpTo public constant chi = IFreeFromUpTo(0x0000000000004946c0e9F43F4Dee607b0eF1fA1c);
    address payable public override treasury;
    IERC20Burnable token;
    IUniswapV2Router02 routerInterface = IUniswapV2Router02(UniRouter);
    address internal WETH = routerInterface.WETH();
    bool shouldDirectBurn = false;

    modifier discountCHI {
        uint256 gasStart = gasleft();
        _;
        uint256 gasSpent = 21000 + gasStart - gasleft() + 16 *
                           msg.data.length;
            if(chi.balanceOf(address(this)) > 0) {
                chi.freeFromUpTo(address(this), (gasSpent + 14154) / 41947);
            }
            else {
                chi.freeFromUpTo(msg.sender, (gasSpent + 14154) / 41947);
            }
    }

    constructor() public {
        treasury = msg.sender;
        require(chi.approve(address(this), uint256(-1)));
    }

    function setToken(address tokenAddr) public onlyOwner {
        token = IERC20Burnable(tokenAddr);
    }

    function toggleBurn() public onlyOwner {
        shouldDirectBurn = !shouldDirectBurn;
    }

    function setTreasury(address treasuryN) external override{
        require(msg.sender == address(token), "only token");
        treasury = payable(treasuryN);
    }

    receive () external payable {}

    /** Path stuff **/
    function getPath(address tokent,bool isSell) internal view returns (address[] memory path){
        path = new address[](2);
        path[0] = isSell ? tokent : WETH;
        path[1] = isSell ? WETH : tokent;
        return path;
    }

    function getSellPath(address tokent) public view returns (address[] memory path) {
        path = getPath(tokent,true);
    }

    function getBuyPath(address tokent) public view returns (address[] memory path){
        path = getPath(tokent,false);
    }
    /** Path stuff end **/

    function rebalance(address rewardRecp) external discountCHI override returns (uint256)  {
        require(msg.sender == address(token), "only token");
        swapEthForTokens();
        uint256 lockableBalance = token.balanceOf(address(this));
        uint256 callerReward = token.getCallerCut(lockableBalance);
        token.transfer(rewardRecp, callerReward);
        if(shouldDirectBurn) {
            token.burn(lockableBalance.sub(callerReward,"Underflow on burn"));
        }
        else {
            token.transfer(burnAddr,lockableBalance.sub(callerReward,"Underflow on burn"));
        }
        return lockableBalance.sub(callerReward,"underflow on return");
    }

    function swapEthForTokens() private {

        uint256 treasuryAmount = token.getCallerCut(address(this).balance);
        (bool success,) = treasury.call{value: treasuryAmount}("");
        require(success,"treasury send failed");

        routerInterface.swapExactETHForTokensSupportingFeeOnTransferTokens{value: address(this).balance}(
                0,
                getBuyPath(address(token)),
                address(this),
                block.timestamp.add(200)
            );
    }

    function swapTokensForETH(uint256 tokenAmount) private {
        //Approve before swap
        token.approve(UniRouter,tokenAmount);
        routerInterface.swapExactTokensForETHSupportingFeeOnTransferTokens(
                tokenAmount,
                0,
                getSellPath(address(token)),
                address(this),
                block.timestamp.add(200)
        );
    }



    function addLiq(uint256 tokenAmount,uint256 ethamount) private {
        //Approve before adding liq
        token.approve(UniRouter,tokenAmount);
        routerInterface.addLiquidityETH{value:ethamount}(
            address(token),
            tokenAmount,
            0,
            ethamount.div(2),//Atleast half of eth should be added
            address(token),
            block.timestamp.add(200)
        );
    }

    function AddLiq() external discountCHI override returns (bool)  {
        //Sell half of the amount to ETH
        uint256 tokenAmount  = token.balanceOf(address(this)).div(2);
        //Swap half of it to eth
        swapTokensForETH(tokenAmount);
        //Add liq with remaining eth and tokens
        addLiq(token.balanceOf(address(this)),address(this).balance);
        //If any eth remains swap to token
        if(address(this).balance > 0)
            swapEthForTokens();
        return true;
    }

}
// File: /Users/akshaycm/Documents/rfits-token/contracts/interfaces/CommonImports.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.8;
import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/math/SafeMath.sol';
import '@openzeppelin/contracts/access/Ownable.sol';
// File: /Users/akshaycm/Documents/rfits-token/contracts/interfaces/IBalancer.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.8;
interface IBalancer {
  function treasury (  ) external view returns ( address payable );
  function setTreasury ( address treasuryN ) external;
  function rebalance ( address rewardRecp ) external returns ( uint256 );
  function AddLiq (  ) external returns (bool);
}
// File: /Users/akshaycm/Documents/rfits-token/contracts/interfaces/IERC20Burnable.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.8;
import {IERC20} from '../interfaces/CommonImports.sol';
interface IERC20Burnable is IERC20 {
    function burn(uint256 amount) external;
    function getLiqAddBudget(uint256 amount) external view returns (uint256);
    function getCallerCut(uint256 amount) external view returns (uint256);
}
// File: /Users/akshaycm/Documents/rfits-token/contracts/interfaces/IUniswapV2Router02.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.8;
interface IUniswapV2Router02 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
      uint amountOutMin,
      address[] calldata path,
      address to,
      uint deadline
    ) external payable;
    function removeLiquidityETH(
      address token,
      uint liquidity,
      uint amountTokenMin,
      uint amountETHMin,
      address to,
      uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function removeLiquidityETHSupportingFeeOnTransferTokens(
      address token,
      uint liquidity,
      uint amountTokenMin,
      uint amountETHMin,
      address to,
      uint deadline
    ) external returns (uint amountETH);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
}
// File: @openzeppelin/contracts/GSN/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/access/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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.
 */
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 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: @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, 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;
    }
}

// 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);
}