////////////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////.////////////////////////////////.////////////////////////////////////
///////////////////////////////////.@.//////////////////////////////////.@./////////////////////////////////
////////////////////////////////.@@.//////////////////////////////////////.@@.//////////////////////////////
/////////////////////////////..@@@.////////////////////////////////////////.@@@..///////////////////////////
///////////////////////////.@@@@@.//////////////////////////////////////////.@@@@@./////////////////////////
/////////////////////////.@@@@@@@////////////////////////////////////////////@@@@@@@.///////////////////////
////////////////////////.@@@@@@@.////////////////////////////////////////////.@@@@@@@.//////////////////////
//////////////////..///.@@@@@@@@//////////////////////////////////////////////@@@@@@@@.///..////////////////
////////////////.@@.//.@@@@@@@@@//////////////////////////////////////////////@@@@@@@@@.//.@@.//////////////
///////////////@@@@.//@@@@@@@@@.//////////////////////////////////////////////.@@@@@@@@@//@@@@@/////////////
//////////////@@@@@@//@@@@@@@@@.//////////////////////////////////////////////.@@@@@@@@@//@@@@@@////////////
/////////////@@@@@@@./@@@@@@@@@@//////////////////////////////////////////////@@@@@@@@@./.@@@@@@@///////////
/////////////@@@@@@@@//@@@@@@@@@.////////////////////////////////////////////.@@@@@@@@@//@@@@@@@@///////////
/////////////@@@@@@@@.//.@@@@@@@@.//////////////////////////////////////////@@@@@@@@@.//.@@@@@@@@///////////
/////////////@@@@@@@@@///.@@@@@@@@@.////////.//////////////////////////////@@@@@@@@@.///@@@@@@@@@///////////
/////////////.@@@@@@@@@///..@@@@@@@.////////.@.///////////////////////////.@@@@@@@.////@@@@@@@@@.///////////
//////////////.@@@@@@@@@.////.@@@@///////////.@@.//////////////////////////.@@@@.////.@@@@@@@@@.////////////
//////////.////.@@@@@@@@@@./////./////////////.@@@@..////////////////////////./////.@@@@@@@@@@.///..////////
//////////@@.///.@@@@@@@@@@@.//////////////////.@@@@@@@@@@./////////////////////..@@@@@@@@@@.///.@@.////////
//////////@@@@.///.@@@@@@@@@@@@.////////////////.@@@@@@@@@@@..///////////////.@@@@@@@@@@@@@.//.@@@@.////////
//////////.@@@@@@.///.@@@@@@@@@@@.///////////////.@@@@@@@@@@@@./////////////.@@@@@@@@@@@.//.@@@@@@@.////////
//////////.@@@@@@@@.////.@@@@@@@@@.///////////////@@@@@@@@@...@////////////.@@@@@@@@@.//..@@@@@@@@@.////////
//////////.@@@@@@@@@@@..////..@@@@@@./////////////@@@@@@@@@ /////////////.@@@@@@..///..@@@@@@@@@@@./////////
///////////.@@@@@@@@@@@@@@..//////.....///////////@@@@@@@@@.///////////...../////..@@@@@@@@@@@@@@@//////////
////////////.@@@@@@@@@@@@@@@@@@....///////////////@@@@@@@@@.///////////////...@@@@@@@@@@@@@@@@@@@.//////////
/////////////.@@@@@@@@@@@@@@@@@@@@@@@@@@@..///////@@@@@@@@@@//////....@@@@@@@@@@@@@@@@@@@@@@@@@@.///////////
//////////////.@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@.///.@@@@@@@@@@/////@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@/////////////
////////////////.@@@@@@@@@@@@@@@@@@@@@@@@@@@@@///@@@@@@@@@@@.///.@@@@@@@@@@@@@@@@@@@@@@@@@@@@.//////////////
//////////////////.@@@@@@@@@@@@@@@@@@@@@@@@@@@@/@@@@@@@@@@@@@./.@@@@@@@@@@@@@@@@@@@@@@@@@@@.////////////////
////////////////////.@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@..//////////////////
//////////////////////..@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@./////////////////////
/////////////////////////..@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@.////////////////////////
/////////////////////////////..@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@..///////////////////////////               
/////////////////////////////////..@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@..///////////////////////////////
//////////////////////////////////////...@@@@@@@@@@@@@@@@@@@@@@@@@@@@...////////////////////////////////////
//////////////////////////////////////////////...@@@@@@@@@@@@@@...//////////////////////////////////////////
//////////////////////////////////////////////////.@@@@@@@@@////////////////////////////////////////////////
////////////////////////////////////////////////.@@@@@./@@@@@///////////////////////////////////////////////
///////////////////////////////////////////////.@@@@@@///@@@@@./////////////////////////////////////////////
/////////////////////////////////////////////.@@@@@@@/.@./@@@@@@.///////////////////////////////////////////
////////////////////////////////////////////@@@@@@@@/.@@@/.@@@@@@@./////////////////////////////////////////
///////////////////////////////////////////.@@@@@@@//@@@@@//@@@@@@@.////////////////////////////////////////
////////////////////////////////////////////.@@@@@./@@@@@@@/.@@@@@./////////////////////////////////////////
//////////////////////////////////////////////.@@./@@@@@@@@@/.@@.///////////////////////////////////////////
///////////////////////////////////////////////../@@@@@@@@@@@/..////////////////////////////////////////////
/////////////////////////////////////////////////@@@@@@@@@@@@@//////////////////////////////////////////////
////////////////////////////////////////////////@@@@@@@@@@@@@@@/////////////////////////////////////////////
///////////////////////////////////////////////@@@@@@.///.@@@@@.////////////////////////////////////////////
//////////////////////////////////////////////.@@..//.@@..//..@@.///////////////////////////////////////////
/////////////////////////////////////////////..//////@@@@//////...//////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////_______///________//____////____//_______//______///////__///__////______////______////////////
/////////////@@_____|//@@@__@@@\/\@@@\  /@@@//|@@@____||@@@_  \/////|@@\ |@@|///  __  \//|@@@_@@\///////////
////////////|@@|//__//|@@|  |@@|//\@@@\/@@@///|@@|__///|@@|_)  |////|@@@\|@@|/|@@|  |@@|/|@@|_)@@|//////////
////////////|@@| |_@|/|@@|  |@@|///\@@@@@@////|@@@__|//|@@@@@@//////|@@.@`@@|/|@@|  |@@|/|@@@@@@////////////
////////////|@@|__|@|/|@@`--'@@|////\@@@@/////|@@|____/|@@|\@@\----.|@@|\@@@|/|@@`--'@@|/|@@|\@@\----.//////
/////////////\______|//\______///////\__//////|_______|| _| `._____||__| \__|//\______///|@_| `._____|//////
////////////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////////

// SPDX-License-Identifier: MIT
// Author: Uni <3
// Intent: Rewards Loyalty Points to the LOYAL early adopters of Governor DAO.
// We Are One. We Are All.

// File: browser/Address.sol

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 v3.3._
     */
    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 v3.3._
     */
    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: browser/SafeERC20.sol

pragma solidity >=0.6.0 <0.8.0;




/**
 * @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: browser/ReentrancyGuard.sol

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 () {
        _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: browser/Context.sol

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: browser/Ownable.sol

pragma solidity >=0.6.0 <0.8.0;

/**
 * @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 () {
        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: browser/Pausable.sol

pragma solidity >=0.6.0 <0.8.0;


/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor () {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!_paused, "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// File: browser/IERC20.sol

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: browser/IStakedRewardsPool.sol

pragma solidity ^0.7.0;


interface IStakedRewardsPool {
	/* Views */

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

	function earned(address account) external view returns (uint256);

	function rewardsToken() external view returns (IERC20);

	function stakingToken() external view returns (IERC20);

	function stakingTokenDecimals() external view returns (uint8);

	function totalSupply() external view returns (uint256);

	/* Mutators */

	function exit() external;

	function getReward() external;

	function getRewardExact(uint256 amount) external;

	function pause() external;

	function recoverUnsupportedERC20(
		IERC20 token,
		address to,
		uint256 amount
	) external;

	function stake(uint256 amount) external;

	function unpause() external;

	function updateReward() external;

	function updateRewardFor(address account) external;

	function withdraw(uint256 amount) external;

	/* Events */

	event RewardPaid(address indexed account, uint256 amount);
	event Staked(address indexed account, uint256 amount);
	event Withdrawn(address indexed account, uint256 amount);
	event Recovered(IERC20 token, address indexed to, uint256 amount);
}

// File: browser/IStakedRewardsPoolTimedRate.sol

pragma solidity ^0.7.0;


interface IStakedRewardsPoolTimedRate is IStakedRewardsPool {
	/* Views */

	function accruedRewardPerToken() external view returns (uint256);

	function hasEnded() external view returns (bool);

	function hasStarted() external view returns (bool);

	function lastTimeRewardApplicable() external view returns (uint256);

	function periodDuration() external view returns (uint256);

	function periodEndTime() external view returns (uint256);

	function periodStartTime() external view returns (uint256);

	function rewardRate() external view returns (uint256);

	function timeRemainingInPeriod() external view returns (uint256);

	/* Mutators */

	function addToRewardsAllocation(uint256 amount) external;

	function setNewPeriod(uint256 startTime, uint256 endTime) external;

	/* Events */

	event RewardAdded(uint256 amount);
	event NewPeriodSet(uint256 startTIme, uint256 endTime);
}

// File: browser/SafeMath.sol

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.
     */
    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.
     */
    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.
     */
    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.
     */
    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.
     */
    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: browser/Math.sol

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}

// File: browser/StakedRewardsPool.sol

pragma solidity ^0.7.0;

abstract contract StakedRewardsPool is Context,	ReentrancyGuard, Ownable, Pausable, IStakedRewardsPool {
	using SafeERC20 for IERC20;
	using SafeMath for uint256;

	mapping(address => uint256) internal _rewards;

	uint8 private _stakingTokenDecimals;
	IERC20 private _rewardsToken;
	IERC20 private _stakingToken;
	uint256 private _stakingTokenBase;

	mapping(address => uint256) private _balances;
	uint256 private _totalSupply;

	constructor(IERC20 rewardsToken_, IERC20 stakingToken_, uint8 stakingTokenDecimals_) Ownable() {
		// Prevent overflow, though 76 would create a safe but unusable contract
		require(stakingTokenDecimals_ < 77, 'SR Pool: 76 decimals limit');
		_rewardsToken = rewardsToken_;
		_stakingToken = stakingToken_;
		_stakingTokenDecimals = stakingTokenDecimals_;
		_stakingTokenBase = 10**stakingTokenDecimals_;
	}


	/* Public Views */

	function balanceOf(address account) public view override returns (uint256) { return _balances[account]; }

	function earned(address account) public view virtual override returns (uint256);

	function rewardsToken() public view override returns (IERC20) {	return _rewardsToken; }

	function stakingToken() public view override returns (IERC20) {	return _stakingToken; }

	function stakingTokenDecimals() public view override returns (uint8) { return _stakingTokenDecimals; }

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

	/* Public Mutators */

	function exit() public override nonReentrant { _exit();	}

	function getReward() public override nonReentrant {	_getReward(); }

	function getRewardExact(uint256 amount) public override nonReentrant { _getRewardExact(amount);	}

	function pause() public override onlyOwner { _pause(); }

	function recoverUnsupportedERC20(IERC20 token, address to, uint256 amount) public override onlyOwner { _recoverUnsupportedERC20(token, to, amount); }

	function stake(uint256 amount) public override nonReentrant whenNotPaused {	_stakeFrom(_msgSender(), amount); }

	function unpause() public override onlyOwner { _unpause(); }

	function updateReward() public override nonReentrant { _updateRewardFor(_msgSender()); }

	function updateRewardFor(address account) public override nonReentrant { _updateRewardFor(account); }

	function withdraw(uint256 amount) public override nonReentrant { _withdraw(amount); }

	function _getStakingTokenBase() internal view returns (uint256) { return _stakingTokenBase; }

	/* Internal Mutators */

	function _exit() internal virtual {
		_withdraw(_balances[_msgSender()]);
		_getReward();
	}

	function _getReward() internal virtual {
		_updateRewardFor(_msgSender());
		uint256 reward = _rewards[_msgSender()];
		if (reward > 0) {
			_rewards[_msgSender()] = 0;
			_rewardsToken.safeTransfer(_msgSender(), reward); // consider transfer
		
			emit RewardPaid(_msgSender(), reward);
		}
	}

	function _getRewardExact(uint256 amount) internal virtual {
		_updateRewardFor(_msgSender());
		uint256 reward = _rewards[_msgSender()];
		require(amount <= reward, 'SR Pool: cannot redeem more rewards than earned');
		
		_rewards[_msgSender()] = reward.sub(amount);
		_rewardsToken.safeTransfer(_msgSender(), amount); // consider transfer
		
		emit RewardPaid(_msgSender(), amount);
	}

	function _recoverUnsupportedERC20(IERC20 token, address to,	uint256 amount) internal virtual {
		require(token != _stakingToken, 'StakedRewardsPool: cannot withdraw the staking token');
		require(token != _rewardsToken, 'StakedRewardsPool: cannot withdraw the rewards token');
		
		token.safeTransfer(to, amount);
		
		emit Recovered(token, to, amount);
	}

	function _stakeFrom(address account, uint256 amount) internal virtual {
		require(account != address(0), 'SR Pool: cannot stake from the zero address');
		require(amount > 0, 'SR Pool: cannot stake zero');
		
		_updateRewardFor(account);
		
		_totalSupply = _totalSupply.add(amount);
		_balances[account] = _balances[account].add(amount);
		_stakingToken.safeTransferFrom(account, address(this), amount);
		
		emit Staked(account, amount);
	}

	function _updateRewardFor(address account) internal virtual;

	function _withdraw(uint256 amount) internal virtual {
		require(amount > 0, 'StakedRewardsPool: cannot withdraw zero');
		
		_updateRewardFor(_msgSender());
		
		_totalSupply = _totalSupply.sub(amount);
		_balances[_msgSender()] = _balances[_msgSender()].sub(amount);
		_stakingToken.safeTransfer(_msgSender(), amount);
		_getReward();
		
		emit Withdrawn(_msgSender(), amount);
	}
}

// File: browser/LoyaltyMine.sol

pragma solidity ^0.7.0;

// Accuracy in block.timestamp is not needed.
// https://consensys.github.io/smart-contract-best-practices/recommendations/#the-15-second-rule
/* solhint-disable not-rely-on-time */

contract LoyaltyMine is StakedRewardsPool, IStakedRewardsPoolTimedRate {
	using SafeMath for uint256;

	uint256 private _accruedRewardPerToken;
	mapping(address => uint256) private _accruedRewardPerTokenPaid;
	uint256 private _lastUpdateTime;
	uint256 private _periodEndTime;
	uint256 private _periodStartTime;
	uint256 private _rewardRate;

	modifier whenStarted {
		require(hasStarted(), 'SRPTR: current rewards distribution period has not yet begun');
		_;
	}

	constructor(IERC20 rewardsToken, IERC20 stakingToken, uint8 stakingTokenDecimals, uint256 periodStartTime_, uint256 periodEndTime_)
	StakedRewardsPool(rewardsToken, stakingToken, stakingTokenDecimals) {
		_periodStartTime = periodStartTime_;
		_periodEndTime = periodEndTime_;
	}

	// Represents the ratio of reward token to staking token accrued thus far
	// multiplied by 10**stakingTokenDecimal (in event of a fraction).
	function accruedRewardPerToken() public view override returns (uint256) {
		uint256 totalSupply = totalSupply();
		if (totalSupply == 0) {
			return _accruedRewardPerToken;
		}

		uint256 lastUpdateTime = _lastUpdateTime;
		uint256 lastTimeApplicable = lastTimeRewardApplicable();

		// Allow staking at any time without earning undue rewards.
		// The following is guaranteed if the next `if` is true:
		// lastUpdateTime == previous _periodEndTime || lastUpdateTime == 0
		if (_periodStartTime > lastUpdateTime) {
			// Prevent underflow
			if (_periodStartTime > lastTimeApplicable) {
				return _accruedRewardPerToken;
			}
			lastUpdateTime = _periodStartTime;
		}

		uint256 dt = lastTimeApplicable.sub(lastUpdateTime);

		if (dt == 0) {
			return _accruedRewardPerToken;
		}

		uint256 accruedReward = _rewardRate.mul(dt);
		return _accruedRewardPerToken.add(accruedReward.mul(_getStakingTokenBase()).div(totalSupply));
	}

	function earned(address account) public view override(IStakedRewardsPool, StakedRewardsPool) returns (uint256) {
		// Divide by stakingTokenBase in accordance with accruedRewardPerToken()
		return
			balanceOf(account)
				.mul(accruedRewardPerToken().sub(_accruedRewardPerTokenPaid[account]))
				.div(_getStakingTokenBase())
				.add(_rewards[account]);
	}

	function hasStarted() public view override returns (bool) {	return block.timestamp >= _periodStartTime; }

	function hasEnded() public view override returns (bool) { return block.timestamp >= _periodEndTime;	}

	function lastTimeRewardApplicable() public view override returns (uint256) {
		// Returns 0 if we have never run a staking period, else most recent historical endTime.
		if (!hasStarted()) {
			return _lastUpdateTime;
		}
		return Math.min(block.timestamp, _periodEndTime);
	}

	function periodDuration() public view override returns (uint256) { return _periodEndTime.sub(_periodStartTime);	}

	function periodEndTime() public view override returns (uint256) { return _periodEndTime; }

	function periodStartTime() public view override returns (uint256) { return _periodStartTime; }

	function rewardRate() public view override returns (uint256) { return _rewardRate; }

	function timeRemainingInPeriod() public view override whenStarted returns (uint256)	{
		if (hasEnded()) {
			return 0;
		}

		return _periodEndTime.sub(block.timestamp);
	}

	/* Public Mutators */

	function addToRewardsAllocation(uint256 amount)	public override nonReentrant onlyOwner {
		_addToRewardsAllocation(amount);
	}

	function setNewPeriod(uint256 startTime, uint256 endTime) public override onlyOwner {
		require(!hasStarted() || hasEnded(), 'SRPTR: cannot change an ongoing staking period');
		require(endTime > startTime, 'SRPTR: ends before the fun begins');
		// The lastTimeRewardApplicable() function would not allow rewards for a past period that was never initiated.
		require(startTime > block.timestamp, 'SRPTR: startTime must be greater than the current block time');
		// Ensure rewards are fully granted before changing the period.
		_updateAccrual();

		if (hasEnded()) {
			// Reset reward rate if this a **new** period (not changing one)
			// Note: you MUST addToRewardsAllocation again if you forgot to call
			// this after the previous period ended but before adding rewards.
			_rewardRate = 0;
		} else {
			// Update reward rate for new duration.
			uint256 totalReward = _rewardRate.mul(periodDuration());
			_rewardRate = totalReward.div(endTime.sub(startTime));
		}

		_periodStartTime = startTime;
		_periodEndTime = endTime;

		emit NewPeriodSet(startTime, endTime);
	}

	/* Internal Mutators */

	// Ensure that the amount param is equal to the amount you've added to the contract, otherwise the funds will run out before _periodEndTime.
	// If called during an ongoing staking period, then the amount will be allocated to the current staking period, otherwise the next period.
	function _addToRewardsAllocation(uint256 amount) internal {
		// TODO Require that amount <= available rewards (see below)
		_updateAccrual();

		// Update reward rate based on remaining time.
		uint256 remainingTime;
		if (!hasStarted() || hasEnded()) {
			remainingTime = periodDuration();
		} else {
			remainingTime = timeRemainingInPeriod();
		}

		_rewardRate = _rewardRate.add(amount.div(remainingTime));

		emit RewardAdded(amount);
	}

	function _updateAccrual() internal {
		_accruedRewardPerToken = accruedRewardPerToken();
		_lastUpdateTime = lastTimeRewardApplicable();
	}

	// This logic is needed for any interaction that may manipulate rewards.
	function _updateRewardFor(address account) internal override {
		_updateAccrual();
		// Allocate accrued rewards.
		_rewards[account] = earned(account);
		// Remove ability to earn rewards on or before the current timestamp.
		_accruedRewardPerTokenPaid[account] = _accruedRewardPerToken;
	}
}

{
  "compilationTarget": {
    "LoyaltyMine.sol": "LoyaltyMine"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}