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// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

import {Address} from "@openzeppelin/contracts/utils/Address.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {
    SafeERC20
} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {
    IUniswapV2Router02
} from "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
import {
    IUniswapV2Factory
} from "@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol";
import {BuyBackStore} from "./BuyBackStore.sol";
import {FundStore} from "./FundStore.sol";
import {DataStore} from "./DataStore.sol";

import "./Roles.sol";

interface IWrappedNative {
    function deposit() external payable;
    function withdraw(uint256) external;
}

/// @title Swapper
/// @notice Swaps tokens for base token
contract Swapper is Roles {
    using SafeERC20 for IERC20;
    // Constants for unit and BPS divider
    uint256 public constant UNIT = 10 ** 18;
    uint256 public constant BPS_DIVIDER = 10000;

    IERC20 public Pingu;
    address public WNative;

    IUniswapV2Router02 public router;
    IUniswapV2Factory public factory;

    DataStore public DS;
    FundStore public fundStore;
    BuyBackStore public buyBackStore;

    mapping(address => uint256) public minAmount;
    address[] public routeHints;

    // Custom ReentrancyGuard
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;
    uint256 private _status;

    uint256 public maxSlippageBps;

    // Events
    event RouterUpdated(
        address indexed previousRouter,
        address indexed newRouter
    );
    event FactoryUpdated(
        address indexed previousFactory,
        address indexed newFactory
    );
    event WNativeUpdated(
        address indexed previousWNative,
        address indexed newWNative
    );
    event MinAmountUpdated(address indexed token, uint256 minAmount);
    event TokensSwapped(
        address indexed caller,
        address indexed tokenIn,
        uint256 amountIn,
        uint256 amountOut
    );
    event RewardPaid(
        address indexed caller,
        address indexed token,
        uint256 amount
    );
    event MaxSlippageUpdated(uint256 indexed newMaxSlippageBps);

    /// @notice Modifier to prevent reentrancy
    modifier nonReentrant() {
        require(_status != _ENTERED, "Swapper: reentrant call");
        _status = _ENTERED;
        _;
        _status = _NOT_ENTERED;
    }

    /// @notice Initialize the Swapper
    /// @param _router The address of the router
    /// @param ds The address of the DataStore
    /// @param rs The address of the RoleStore
    function initialize(
        address _router,
        address ds,
        address rs
    ) external initializer {
        require(_router != address(0), "Swapper: router is zero");
        require(
            Address.isContract(_router),
            "Swapper: router must be a contract"
        );

        DS = DataStore(ds);
        roleStore = RoleStore(rs);
        _setGov(msg.sender);
        _status = _NOT_ENTERED;
        router = IUniswapV2Router02(_router);
        Pingu = IERC20(DS.getAddress("PINGU"));
        _syncRouterDeps(_router);
    }

    /// @notice Link the Swapper to the protocol contracts
    /// @dev Only callable by governance
    function link() external onlyGov {
        fundStore = FundStore(DS.getAddress("FundStore"));
        buyBackStore = BuyBackStore(DS.getAddress("BuyBackStore"));
        Pingu = IERC20(DS.getAddress("PINGU"));
        _approveTokenIfNeeded(
            address(Pingu),
            address(fundStore),
            type(uint256).max
        );
    }

    /// @notice Set the max slippage in bps
    /// @param newMaxSlippageBps The new max slippage in bps
    /// @dev Only callable by governance
    function setMaxSlippageBps(uint256 newMaxSlippageBps) external onlyGov {
        require(
            newMaxSlippageBps <= BPS_DIVIDER,
            "Swapper: max slippage must be less than or equal to 100%"
        );
        maxSlippageBps = newMaxSlippageBps;
        emit MaxSlippageUpdated(newMaxSlippageBps);
    }

    /// @notice Set the router
    /// @param newRouter The address of the new router
    /// @dev Only callable by governance
    function setRouter(address newRouter) external onlyGov {
        require(newRouter != address(0), "Swapper: router is zero");
        require(
            Address.isContract(newRouter),
            "Swapper: router must be a contract"
        );
        emit RouterUpdated(address(router), newRouter);
        router = IUniswapV2Router02(newRouter);
        _syncRouterDeps(newRouter);
    }

    /// @notice Set the minimum amount for a token
    /// @param token The address of the token
    /// @param amount The minimum amount
    /// @dev Only callable by governance
    function setMinAmount(address token, uint256 amount) external onlyGov {
        minAmount[token] = amount;
        emit MinAmountUpdated(token, amount);
    }

    /// @notice Set the minimum amounts for a tokens
    /// @param tokens The addresses of the tokens
    /// @param amounts The minimum amounts
    /// @dev Only callable by governance
    function setMinAmounts(
        address[] calldata tokens,
        uint256[] calldata amounts
    ) external onlyGov {
        require(
            tokens.length == amounts.length,
            "Swapper: array length mismatch"
        );
        for (uint256 i = 0; i < tokens.length; i++) {
            minAmount[tokens[i]] = amounts[i];
            emit MinAmountUpdated(tokens[i], amounts[i]);
        }
    }

    /// @notice Set the route hints
    /// @param tokens The addresses of the tokens
    /// @dev Only callable by governance
    function setRouteHints(address[] calldata tokens) external onlyGov {
        delete routeHints;
        for (uint256 i = 0; i < tokens.length; i++) {
            require(tokens[i] != address(0), "Swapper: zero hint");
            routeHints.push(tokens[i]);
        }
    }

    /// @notice Swap tokens for base token automatically
    /// @param tokensIn The addresses of the tokens in
    /// @param userAddress The address of the user
    /// @return totalBaseOut The total amount of base token out
    /// @dev Only callable by a contract
    function swapTokensForBaseAuto(
        address[] calldata tokensIn,
        address userAddress
    ) external onlyContract nonReentrant returns (uint256 totalBaseOut) {
        uint256 buyBackReward = buyBackStore.getBuyBackReward();
        for (uint256 i = 0; i < tokensIn.length; i++) {
            address tokenIn = tokensIn[i];
            address inputToken = tokenIn == address(0) ? WNative : tokenIn;
            uint256 min = minAmount[inputToken];
            if (min == 0) continue;
            uint256 candidate = buyBackStore.getAssetBalance(tokenIn);
            if (candidate < min) continue;

            address[] memory path = _computePath(inputToken);
            if (path.length == 0) continue;

            uint256 buyBackRewardAmount = (buyBackReward * candidate) /
                BPS_DIVIDER;
            uint256 amountIn = candidate - buyBackRewardAmount;
            if (amountIn == 0) continue;

            uint256 amountOutMin = 0;
            if (maxSlippageBps > 0) {
                try router.getAmountsOut(amountIn, path) returns (
                    uint256[] memory amountsOut
                ) {
                    uint256 expectedOut = amountsOut[amountsOut.length - 1];
                    if (expectedOut == 0) {
                        continue;
                    }
                    amountOutMin =
                        (expectedOut * (BPS_DIVIDER - maxSlippageBps)) /
                        BPS_DIVIDER;
                    if (amountOutMin == 0) {
                        continue;
                    }
                } catch {
                    continue;
                }
            }

            fundStore.transferOut(tokenIn, address(this), amountIn);

            if (tokenIn == address(0)) {
                IWrappedNative(WNative).deposit{value: amountIn}();
            }

            _approveTokenIfNeeded(inputToken, address(router), amountIn);

            bool swapSucceeded = false;
            uint256 received = 0;
            try
                router.swapExactTokensForTokens(
                    amountIn,
                    amountOutMin,
                    path,
                    address(this),
                    block.timestamp + 5 minutes
                )
            returns (uint256[] memory amounts) {
                received = amounts[amounts.length - 1];
                totalBaseOut += received;
                swapSucceeded = true;
            } catch {}
            if (swapSucceeded) {
                buyBackStore.decrementAssetBalance(tokenIn, amountIn);
                if (buyBackRewardAmount > 0) {
                    fundStore.transferOut(
                        tokenIn,
                        userAddress,
                        buyBackRewardAmount
                    );
                    emit RewardPaid(userAddress, tokenIn, buyBackRewardAmount);
                    buyBackStore.decrementAssetBalance(
                        tokenIn,
                        buyBackRewardAmount
                    );
                }
                emit TokensSwapped(userAddress, tokenIn, amountIn, received);
            } else {
                if (tokenIn == address(0)) {
                    IWrappedNative(WNative).withdraw(amountIn);
                    fundStore.transferIn{value: amountIn}(
                        address(0),
                        address(this),
                        amountIn
                    );
                } else {
                    _approveTokenIfNeeded(
                        tokenIn,
                        address(fundStore),
                        amountIn
                    );
                    fundStore.transferIn(tokenIn, address(this), amountIn);
                }
            }
        }
        uint256 PinguBalance = IERC20(Pingu).balanceOf(address(this));
        buyBackStore.incrementPinguBalance(PinguBalance);
        fundStore.transferIn(address(Pingu), address(this), PinguBalance);
        return totalBaseOut;
    }

    /// @notice Approve the token if needed
    /// @param token The address of the token
    /// @param spender The address of the spender
    /// @param amount The amount of the token
    /// @dev Internal function
    function _approveTokenIfNeeded(
        address token,
        address spender,
        uint256 amount
    ) internal {
        IERC20 erc20 = IERC20(token);
        uint256 currentAllowance = erc20.allowance(address(this), spender);
        if (currentAllowance < amount) {
            if (currentAllowance > 0) {
                erc20.safeApprove(spender, 0);
            }
            erc20.safeApprove(spender, type(uint256).max);
        }
    }

    /// @notice Compute the path for the swap
    /// @param tokenIn The address of the token in
    /// @return path The path for the swap
    /// @dev Internal function
    function _computePath(
        address tokenIn
    ) internal view returns (address[] memory path) {
        require(tokenIn != address(0), "Swapper: tokenIn is zero");
        require(address(Pingu) != address(0), "Swapper: base not set");
        require(address(factory) != address(0), "Swapper: factory not set");
        if (tokenIn == address(Pingu)) {
            return new address[](0);
        }

        if (_pairExists(tokenIn, address(Pingu))) {
            path = new address[](2);
            path[0] = tokenIn;
            path[1] = address(Pingu);
            return path;
        }

        uint256 hintsLen = routeHints.length;
        address[] memory hops = new address[](hintsLen + 1);
        uint256 count = 0;
        if (
            WNative != address(0) &&
            WNative != tokenIn &&
            WNative != address(Pingu)
        ) {
            hops[count++] = WNative;
        }
        for (uint256 i = 0; i < hintsLen; i++) {
            address h = routeHints[i];
            if (h == address(0) || h == tokenIn || h == address(Pingu))
                continue;
            bool duplicate = false;
            for (uint256 j = 0; j < count; j++) {
                if (hops[j] == h) {
                    duplicate = true;
                    break;
                }
            }
            if (!duplicate) {
                hops[count++] = h;
            }
        }

        for (uint256 i = 0; i < count; i++) {
            address mid = hops[i];
            if (_pairExists(tokenIn, mid) && _pairExists(mid, address(Pingu))) {
                path = new address[](3);
                path[0] = tokenIn;
                path[1] = mid;
                path[2] = address(Pingu);
                return path;
            }
        }

        for (uint256 i = 0; i < count; i++) {
            address midA = hops[i];
            if (!_pairExists(tokenIn, midA)) continue;
            for (uint256 j = 0; j < count; j++) {
                if (j == i) continue;
                address midB = hops[j];
                if (
                    _pairExists(midA, midB) && _pairExists(midB, address(Pingu))
                ) {
                    path = new address[](4);
                    path[0] = tokenIn;
                    path[1] = midA;
                    path[2] = midB;
                    path[3] = address(Pingu);
                    return path;
                }
            }
        }

        return new address[](0);
    }

    /// @notice Check if the pair exists
    /// @param tokenA The address of the token A
    /// @param tokenB The address of the token B
    /// @return True if the pair exists, false otherwise
    /// @dev Internal function
    function _pairExists(
        address tokenA,
        address tokenB
    ) internal view returns (bool) {
        address pair = factory.getPair(tokenA, tokenB);
        return pair != address(0);
    }

    /// @notice Sync the router dependencies
    /// @param newRouter The address of the new router
    /// @dev Internal function
    function _syncRouterDeps(address newRouter) internal {
        address derivedFactory = IUniswapV2Router02(newRouter).factory();
        require(
            derivedFactory != address(0) && Address.isContract(derivedFactory),
            "Swapper: invalid factory"
        );
        if (address(factory) != derivedFactory) {
            emit FactoryUpdated(address(factory), derivedFactory);
            factory = IUniswapV2Factory(derivedFactory);
        }
        address derivedWNative = IUniswapV2Router02(newRouter).WETH();
        require(derivedWNative != address(0), "Swapper: invalid WNative");
        if (WNative != derivedWNative) {
            emit WNativeUpdated(WNative, derivedWNative);
            WNative = derivedWNative;
        }
    }

    /// @notice Withdraw the native token
    /// @param amount The amount of the native token
    /// @dev Only callable by governance
    function withdrawNative(uint256 amount) external onlyGov {
        require(
            address(this).balance >= amount,
            "Swapper: insufficient balance"
        );
        (bool ok, ) = payable(msg.sender).call{value: amount}("");
        require(ok, "Swapper: native withdraw failed");
    }

    /// @notice Withdraw the ERC20 token
    /// @param token The address of the token
    /// @param amount The amount of the token
    /// @dev Only callable by governance
    function withdrawERC20(address token, uint256 amount) external onlyGov {
        require(
            IERC20(token).balanceOf(address(this)) >= amount,
            "Swapper: insufficient balance"
        );
        IERC20(token).safeTransfer(msg.sender, amount);
    }

    receive() external payable {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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");

        (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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.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 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'
        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) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @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
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

pragma solidity >=0.6.2;

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;
}

pragma solidity >=0.5.0;

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;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.17;

import "./Roles.sol";

/// @title BuyBackStore
/// @notice Persistent storage for BuyBack.sol
contract BuyBackStore is Roles {
    // Constants
    uint256 public constant BPS_DIVIDER = 10000;
    uint256 public constant UNIT = 10 ** 18;

    // Fee share for Buyback
    uint256 public feeShare;

    // Asset to balance
    mapping(address => uint256) private assetsBalances;
    uint256 public pinguBalance;

    // BuyBack reward in bps
    uint256 public buyBackReward;

    // BuyBack paused state
    bool public paused;

    // @notice Initialize the BuyBackStore
    /// @param rs The address of the RoleStore
    function initialize(address rs) external initializer {
        roleStore = RoleStore(rs);
        _setGov(msg.sender);
        pinguBalance = 0;
        feeShare = 3500;
        buyBackReward = 100;
        paused = false;
    }

    /// @notice Set the fee share
    /// @param _feeShare The fee share
    function setFeeShare(uint256 _feeShare) external onlyGov {
        require(_feeShare <= BPS_DIVIDER, "!feeShare");
        feeShare = _feeShare;
    }

    /// @notice Set the buy back reward
    /// @param _buyBackReward The buy back reward
    function setBuyBackReward(uint256 _buyBackReward) external onlyGov {
        require(_buyBackReward <= BPS_DIVIDER, "!reward");
        buyBackReward = _buyBackReward;
    }

    /// @notice Set the paused state
    /// @param _paused The paused state
    function setPaused(bool _paused) external onlyGov {
        paused = _paused;
    }

    /// @notice Increment the asset balance
    /// @param asset The address of the asset
    /// @param amount The amount of the asset
    function incrementAssetBalance(
        address asset,
        uint256 amount
    ) external onlyContract {
        assetsBalances[asset] += amount;
    }

    /// @notice Decrement the asset balance
    /// @param asset The address of the asset
    /// @param amount The amount of the asset
    function decrementAssetBalance(
        address asset,
        uint256 amount
    ) external onlyContract {
        assetsBalances[asset] = assetsBalances[asset] <= amount
            ? 0
            : assetsBalances[asset] - amount;
    }

    /// @notice Reset the asset balance
    /// @param asset The address of the asset
    function resetAssetBalance(address asset) external onlyContract {
        assetsBalances[asset] = 0;
    }

    /// @notice Increment the Pingu balance
    /// @param amount The amount of the Pingu
    function incrementPinguBalance(uint256 amount) external onlyContract {
        pinguBalance += amount;
    }

    /// @notice Decrement the Pingu balance
    /// @param amount The amount of the Pingu
    function decrementPinguBalance(uint256 amount) external onlyContract {
        pinguBalance = pinguBalance <= amount ? 0 : pinguBalance - amount;
    }

    /// @notice Reset the Pingu balance
    function resetPinguBalance() external onlyContract {
        pinguBalance = 0;
    }

    /// @notice Get the asset balance
    /// @param asset The address of the asset
    /// @return The balance of the asset
    function getAssetBalance(address asset) external view returns (uint256) {
        return assetsBalances[asset];
    }

    /// @notice Get the asset balances
    /// @param assets The addresses of the assets
    /// @return The balances of the assets array
    function getAssetsBalances(
        address[] memory assets
    ) external view returns (uint256[] memory) {
        uint256 length = assets.length;
        uint256[] memory balances = new uint256[](length);
        for (uint256 i = 0; i < length; i++) {
            balances[i] = assetsBalances[assets[i]];
        }
        return balances;
    }

    /// @notice Get the Pingu balance
    /// @return The balance of the Pingu
    function getPinguBalance() external view returns (uint256) {
        return pinguBalance;
    }

    /// @notice Get the fee share
    /// @return The fee share
    function getFeeShare() external view returns (uint256) {
        return feeShare;
    }

    /// @notice Get the buy back reward
    /// @return The buy back reward
    function getBuyBackReward() external view returns (uint256) {
        return buyBackReward;
    }

    /// @notice Get the paused state
    /// @return The paused state
    function isPaused() external view returns (bool) {
        return paused;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.17;

import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import "./Roles.sol";

interface IWrappedNative {
    function deposit() external payable;
    function withdraw(uint256) external;
}

/// @title FundStore
/// @notice Storage of protocol funds
contract FundStore is Roles, ReentrancyGuard {
    // Libraries
    using SafeERC20 for IERC20;
    using Address for address payable;

    /// @notice WETH/Wrapped Native token address for fallback claims
    address public weth;

    /// @notice Pending payouts for recipients when direct transfer fails
    /// @dev Mapping: asset => recipient => pending amount
    mapping(address => mapping(address => uint256)) public pendingPayouts;

    /// @notice Emitted when a transfer fails and amount is stored as pending
    event TransferPending(address indexed asset, address indexed to, uint256 amount);

    /// @notice Emitted when a recipient claims their pending payout
    event TransferClaimed(address indexed asset, address indexed to, uint256 amount, bool asWeth);

    function initialize(address rs) external initializer {
        roleStore = RoleStore(rs);
        _setGov(msg.sender);
    }

    /// @notice Sets the WETH address for fallback claims
    /// @param _weth WETH contract address
    function setWeth(address _weth) external onlyGov {
        require(_weth != address(0), "Invalid WETH address");
        weth = _weth;
    }

    /// @notice Transfers `amount` of `asset` in
    /// @dev Only callable by other protocol contracts
    /// @param asset Asset address, e.g. address(0) for ETH
    /// @param from Address where asset is transferred from
    function transferIn(
        address asset,
        address from,
        uint256 amount
    ) external payable onlyContract {
        if (asset == address(0)) {
            require(amount > 0, "ETH:bad-amount");
            require(msg.value == amount, "ETH:bad-amount");
            return;
        }

        require(msg.value == 0, "ERC20:bad-value");
        if (amount == 0) return;
        IERC20(asset).safeTransferFrom(from, address(this), amount);
    }

    /// @notice Transfers `amount` of `asset` out
    /// @dev Only callable by other protocol contracts
    /// @dev For ETH: if transfer fails, amount is stored as pending payout (no revert)
    /// @param asset Asset address, e.g. address(0) for ETH
    /// @param to Address where asset is transferred to
    function transferOut(
        address asset,
        address to,
        uint256 amount
    ) external nonReentrant onlyContract {
        if (amount == 0 || to == address(0)) return;
        if (asset == address(0)) {
            (bool success, ) = payable(to).call{value: amount}("");
            if (!success) {
                // Store as pending payout instead of reverting
                pendingPayouts[asset][to] += amount;
                emit TransferPending(asset, to, amount);
            }
        } else {
            IERC20(asset).safeTransfer(to, amount);
        }
    }

    /// @notice Allows recipients to claim their pending ETH payouts as native ETH
    /// @dev Pull-based mechanism to avoid DoS from recipient contracts rejecting ETH
    /// @dev If your contract cannot receive ETH, use claimAsWeth() instead
    function claim() external nonReentrant {
        uint256 amount = pendingPayouts[address(0)][msg.sender];
        require(amount > 0, "Nothing to claim");

        // Clear pending balance before transfer to prevent reentrancy
        pendingPayouts[address(0)][msg.sender] = 0;

        (bool success, ) = payable(msg.sender).call{value: amount}("");
        require(success, "ETH transfer failed");

        emit TransferClaimed(address(0), msg.sender, amount, false);
    }

    /// @notice Allows recipients to claim their pending ETH payouts as WETH
    /// @dev Use this if your contract cannot receive native ETH
    function claimAsWeth() external nonReentrant {
        require(weth != address(0), "WETH not configured");
        
        uint256 amount = pendingPayouts[address(0)][msg.sender];
        require(amount > 0, "Nothing to claim");

        // Clear pending balance before transfer to prevent reentrancy
        pendingPayouts[address(0)][msg.sender] = 0;

        // Wrap ETH to WETH
        IWrappedNative(weth).deposit{value: amount}();
        
        // Transfer WETH to recipient (ERC20 transfer cannot be rejected)
        IERC20(weth).safeTransfer(msg.sender, amount);

        emit TransferClaimed(address(0), msg.sender, amount, true);
    }

    /// @notice Returns the pending payout amount for a recipient
    /// @param recipient Recipient address
    /// @return Pending amount of ETH
    function getPendingPayout(address recipient) external view returns (uint256) {
        return pendingPayouts[address(0)][recipient];
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.17;

import {Governable} from "./Governable.sol";

/// @title DataStore
/// @notice General purpose storage contract
/// @dev Access is restricted to governance
contract DataStore is Governable {
    // Key-value stores
    mapping(bytes32 => uint256) public uintValues;
    mapping(bytes32 => int256) public intValues;
    mapping(bytes32 => address) public addressValues;
    mapping(bytes32 => bytes32) public dataValues;
    mapping(bytes32 => bool) public boolValues;
    mapping(bytes32 => string) public stringValues;

    function initialize() external initializer {
        _setGov(msg.sender);
    }

    /// @param key The key for the record
    /// @param value value to store
    /// @param overwrite Overwrites existing value if set to true
    function setUint(
        string calldata key,
        uint256 value,
        bool overwrite
    ) external onlyGov returns (bool) {
        bytes32 hash = getHash(key);
        if (overwrite || uintValues[hash] == 0) {
            uintValues[hash] = value;
            return true;
        }
        return false;
    }

    /// @param key The key for the record
    function getUint(string calldata key) external view returns (uint256) {
        return uintValues[getHash(key)];
    }

    /// @param key The key for the record
    /// @param value value to store
    /// @param overwrite Overwrites existing value if set to true
    function setInt(
        string calldata key,
        int256 value,
        bool overwrite
    ) external onlyGov returns (bool) {
        bytes32 hash = getHash(key);
        if (overwrite || intValues[hash] == 0) {
            intValues[hash] = value;
            return true;
        }
        return false;
    }

    /// @param key The key for the record
    function getInt(string calldata key) external view returns (int256) {
        return intValues[getHash(key)];
    }

    /// @param key The key for the record
    /// @param value address to store
    /// @param overwrite Overwrites existing value if set to true
    function setAddress(
        string calldata key,
        address value,
        bool overwrite
    ) external onlyGov returns (bool) {
        bytes32 hash = getHash(key);
        if (overwrite || addressValues[hash] == address(0)) {
            addressValues[hash] = value;
            return true;
        }
        return false;
    }

    /// @param key The key for the record
    function getAddress(string calldata key) external view returns (address) {
        return addressValues[getHash(key)];
    }

    /// @param key The key for the record
    /// @param value byte value to store
    function setData(
        string calldata key,
        bytes32 value
    ) external onlyGov returns (bool) {
        dataValues[getHash(key)] = value;
        return true;
    }

    /// @param key The key for the record
    function getData(string calldata key) external view returns (bytes32) {
        return dataValues[getHash(key)];
    }

    /// @param key The key for the record
    /// @param value value to store (true / false)
    function setBool(
        string calldata key,
        bool value
    ) external onlyGov returns (bool) {
        boolValues[getHash(key)] = value;
        return true;
    }

    /// @param key The key for the record
    function getBool(string calldata key) external view returns (bool) {
        return boolValues[getHash(key)];
    }

    /// @param key The key for the record
    /// @param value string to store
    function setString(
        string calldata key,
        string calldata value
    ) external onlyGov returns (bool) {
        stringValues[getHash(key)] = value;
        return true;
    }

    /// @param key The key for the record
    function getString(
        string calldata key
    ) external view returns (string memory) {
        return stringValues[getHash(key)];
    }

    /// @param key string to hash
    function getHash(string memory key) public pure returns (bytes32) {
        return keccak256(abi.encodePacked(key));
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.17;

import "./Governable.sol";
import "./RoleStore.sol";

/// @title Roles
/// @notice Role-based access control mechanism via onlyContract modifier
abstract contract Roles is Governable {
    bytes32 internal constant CONTRACT_ROLE = keccak256("CONTRACT");

    RoleStore public roleStore;

    /// @dev Reverts if caller address has not the contract role
    modifier onlyContract() {
        require(roleStore.hasRole(msg.sender, CONTRACT_ROLE), "!contract-role");
        _;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

pragma solidity >=0.6.2;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

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

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)

pragma solidity ^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 making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.17;

import {Initializable} from "@openzeppelin/contracts/proxy/utils/Initializable.sol";

/// @title Governable
/// @notice Basic access control mechanism, gov has access to certain functions
abstract contract Governable is Initializable {
    address public gov;

    event SetGov(address prevGov, address nextGov);

    /// @dev Reverts if called by any account other than gov
    modifier onlyGov() {
        require(msg.sender == gov, "!gov");
        _;
    }

    /// @notice Sets a new governance address
    /// @dev Only callable by governance
    function setGov(address _gov) external onlyGov {
        _setGov(_gov);
    }

    /// @notice Sets a new governance address
    /// @dev Internal function without access restriction
    function _setGov(address _gov) internal {
        require(_gov != address(0), "!zero-gov");
        address prevGov = gov;
        gov = _gov;
        emit SetGov(prevGov, _gov);
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.17;

import "./EnumerableSet.sol";
import "./Governable.sol";

/**
 * @title  RoleStore
 * @notice Role-based access control mechanism. Governance can grant and
 *         revoke roles dynamically via {grantRole} and {revokeRole}
 */
contract RoleStore is Governable {
    // Libraries
    using EnumerableSet for EnumerableSet.AddressSet;
    using EnumerableSet for EnumerableSet.Bytes32Set;

    event RoleGranted(
        bytes32 indexed role,
        address indexed account,
        address indexed sender
    );
    event RoleRevoked(
        bytes32 indexed role,
        address indexed account,
        address indexed sender
    );

    // Set of roles
    EnumerableSet.Bytes32Set internal roles;

    // Role -> address
    mapping(bytes32 => EnumerableSet.AddressSet) internal roleMembers;

    function initialize() external initializer {
        _setGov(msg.sender);
    }

    /// @notice Grants `role` to `account`
    /// @dev Only callable by governance
    function grantRole(address account, bytes32 role) external onlyGov {
        // add role if not already present
        if (!roles.contains(role)) roles.add(role);

        require(roleMembers[role].add(account));
        emit RoleGranted(role, account, msg.sender);
    }

    /// @notice Revokes `role` from `account`
    /// @dev Only callable by governance
    function revokeRole(address account, bytes32 role) external onlyGov {
        require(roleMembers[role].remove(account));
        emit RoleRevoked(role, account, msg.sender);

        // Remove role if it has no longer any members
        if (roleMembers[role].length() == 0) {
            roles.remove(role);
        }
    }

    /// @notice Returns `true` if `account` has been granted `role`
    function hasRole(
        address account,
        bytes32 role
    ) external view returns (bool) {
        return roleMembers[role].contains(account);
    }

    /// @notice Returns number of roles
    function getRoleCount() external view returns (uint256) {
        return roles.length();
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/Address.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!Address.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Internal function that returns the initialized version. Returns `_initialized`
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Internal function that returns the initialized version. Returns `_initializing`
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.

pragma solidity 0.8.17;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 *  Trying to delete such a structure from storage will likely result in data corruption, rendering the structure unusable.
 *  See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 *  In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an array of EnumerableSet.
 * ====
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastValue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastValue;
                // Update the index for the moved value
                set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(
        Set storage set,
        bytes32 value
    ) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(
        Set storage set,
        uint256 index
    ) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(
        Bytes32Set storage set,
        bytes32 value
    ) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(
        Bytes32Set storage set,
        bytes32 value
    ) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(
        Bytes32Set storage set,
        bytes32 value
    ) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(
        Bytes32Set storage set,
        uint256 index
    ) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(
        Bytes32Set storage set
    ) internal view returns (bytes32[] memory) {
        bytes32[] memory store = _values(set._inner);
        bytes32[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(
        AddressSet storage set,
        address value
    ) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(
        AddressSet storage set,
        address value
    ) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(
        AddressSet storage set,
        address value
    ) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(
        AddressSet storage set,
        uint256 index
    ) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(
        AddressSet storage set
    ) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(
        UintSet storage set,
        uint256 value
    ) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(
        UintSet storage set,
        uint256 value
    ) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(
        UintSet storage set,
        uint256 index
    ) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(
        UintSet storage set
    ) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

{
  "remappings": [
    "@openzeppelin/=lib/openzeppelin-contracts/",
    "chainlink/=node_modules/@chainlink/",
    "pyth-sdk-solidity/=node_modules/@pythnetwork/pyth-sdk-solidity/",
    "@uniswap/v2-periphery/=node_modules/@uniswap/v2-periphery/",
    "@uniswap/v2-core/=node_modules/@uniswap/v2-core/",
    "ds-test/=lib/openzeppelin-contracts-upgradeable/lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin/=lib/openzeppelin-contracts-upgradeable/contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "viaIR": true
}

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DataStore","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"Pingu","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"UNIT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"WNative","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"buyBackStore","outputs":[{"internalType":"contract BuyBackStore","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"factory","outputs":[{"internalType":"contract IUniswapV2Factory","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fundStore","outputs":[{"internalType":"contract FundStore","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"gov","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_router","type":"address"},{"internalType":"address","name":"ds","type":"address"},{"internalType":"address","name":"rs","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"link","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"maxSlippageBps","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"minAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"roleStore","outputs":[{"internalType":"contract RoleStore","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"routeHints","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"router","outputs":[{"internalType":"contract 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