// File: /Users/akshaycm/Documents/relay3r.network/contracts/interfaces/Keep3r/IKeep3rV1Mini.sol



//SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;
interface IKeep3rV1Mini {
    function isKeeper(address) external returns (bool);
    function worked(address keeper) external;
    function totalBonded() external view returns (uint);
    function bonds(address keeper, address credit) external view returns (uint);
    function votes(address keeper) external view returns (uint);
    function isMinKeeper(address keeper, uint minBond, uint earned, uint age) external returns (bool);
    function addCreditETH(address job) external payable;
    function workedETH(address keeper) external;
}
// File: /Users/akshaycm/Documents/relay3r.network/contracts/interfaces/Yearn/IYERC20.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
interface IYERC20 {
    function rebalance() external;
    function balanceOf(address account) external view returns (uint);
    function token() external view returns (address);
    function calcPoolValueInToken() external view returns (uint);
}
// File: /Users/akshaycm/Documents/relay3r.network/contracts/jobs/YearnV1EarnKeep3r.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;

import '@openzeppelin/contracts/math/SafeMath.sol';
import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

import '../interfaces/Keep3r/IKeep3rV1Mini.sol';
import '../interfaces/Yearn/IYERC20.sol';

contract YearnV1EarnKeep3r {
    using SafeMath for uint;

    uint constant public THRESHOLD = 500;
    uint constant public BASE = 10000;

    IYERC20[] internal _tokens;

    constructor(address keepertoken) public {
        _tokens.push(IYERC20(0xd6aD7a6750A7593E092a9B218d66C0A814a3436e));
        _tokens.push(IYERC20(0x83f798e925BcD4017Eb265844FDDAbb448f1707D));
        _tokens.push(IYERC20(0x73a052500105205d34Daf004eAb301916DA8190f));
        _tokens.push(IYERC20(0xC2cB1040220768554cf699b0d863A3cd4324ce32));
        _tokens.push(IYERC20(0x26EA744E5B887E5205727f55dFBE8685e3b21951));
        _tokens.push(IYERC20(0xE6354ed5bC4b393a5Aad09f21c46E101e692d447));
        _tokens.push(IYERC20(0x04bC0Ab673d88aE9dbC9DA2380cB6B79C4BCa9aE));
        KP3R = IKeep3rV1Mini(keepertoken);
    }

    function tokens() external view returns (IYERC20[] memory) {
        return _tokens;
    }

    modifier upkeep() {
        require(KP3R.isKeeper(msg.sender), "::isKeeper: keeper is not registered");
        _;
        KP3R.worked(msg.sender);
    }

    IKeep3rV1Mini public KP3R;

    function workable() public view returns (bool) {
        for (uint i = 0; i < _tokens.length; i++) {
            if (shouldRebalance(_tokens[i])) {
                return true;
            }
        }
        return false;
    }

    function shouldRebalance(IYERC20 _token) public view returns (bool) {
        uint _total = _token.calcPoolValueInToken();
        uint _available = IERC20(_token.token()).balanceOf(address(_token));
        return _available >= _total.mul(THRESHOLD).div(BASE);
    }

    function work() external upkeep {
        require(workable(), "YearnV1EarnKeep3r::work: !workable()");
        for (uint i = 0; i < _tokens.length; i++) {
            if (shouldRebalance(_tokens[i])) {
                _tokens[i].rebalance();
            }
        }
    }
}

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



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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;

/**
 * @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);
}