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// SPDX-License-Identifier: MIT
pragma solidity =0.8.15;

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "./interfaces/IUniswapCheckpoints.sol";
import "./interfaces/IUniswapV2Factory.sol";
import "./interfaces/IUniswapV2Pair.sol";
import "./libraries/FixedPoint.sol";

contract UniswapCheckpoints is IUniswapCheckpoints, OwnableUpgradeable {
    event CheckpointerUpdated(address oldCheckpointer, address newCheckpointer);
    event NewCheckpoint(address baseToken, address quoteToken, uint256 priceCumulative, uint256 timestamp);

    IUniswapV2Factory public uniswapFactory;
    address public checkpointer;

    // Base Currency -> Quote Currency -> Checkpoint Interval
    mapping(address => mapping(address => uint256)) public minCheckpointIntervals;

    // Base Currency -> Quote Currency -> Checkpoint Counts
    mapping(address => mapping(address => uint256)) public checkpointCounts;

    // Base Currency -> Quote Currency -> (Wrapped) Buffer Index -> Checkpoint
    mapping(address => mapping(address => mapping(uint256 => Checkpoint))) public checkpoints;

    uint256 public constant RING_BUFFER_SIZE = 128;
    uint256 public constant DEFAULT_MIN_CHECKPOINT_INTERVAL = 60;

    modifier onlyCheckpointer() {
        require(msg.sender == checkpointer, "UniswapCheckpoints: not checkpointer");
        _;
    }

    function getCurrentCumulativePrice(address baseToken, address quoteToken)
        external
        view
        returns (uint256 priceCumulative)
    {
        priceCumulative = _getCurrentCumulativePrice(baseToken, quoteToken);
    }

    function getLatestCheckpointOlderThan(address baseToken, address quoteToken, uint256 minAge)
        external
        view
        returns (Checkpoint memory checkpoint)
    {
        checkpoint = _getLatestCheckpointOlderThan(baseToken, quoteToken, minAge);
    }

    function __UniswapCheckpoints_init(IUniswapV2Factory _uniswapFactory) public initializer {
        __Ownable_init();

        require(address(_uniswapFactory) != address(0), "UniswapCheckpoints: zero address");

        uniswapFactory = _uniswapFactory;
    }

    function setCheckpointer(address newCheckpointer) external onlyOwner {
        address oldCheckpointer = checkpointer;
        checkpointer = newCheckpointer;
        emit CheckpointerUpdated(oldCheckpointer, newCheckpointer);
    }

    function makeCheckpoint(address baseToken, address quoteToken) external onlyCheckpointer {
        uint256 checkpointCount = checkpointCounts[baseToken][quoteToken];
        if (checkpointCount > 0) {
            // Check if min interval has passed
            uint256 minInterval = getMinCheckpointInterval(baseToken, quoteToken);
            Checkpoint memory lastCheckpoint = getCheckpointAt(baseToken, quoteToken, checkpointCount - 1);
            require(
                block.timestamp - lastCheckpoint.timestamp >= minInterval,
                "UniswapCheckpoints: checkpointing too frequent"
            );
        }

        uint256 priceCumulative = _getCurrentCumulativePrice(baseToken, quoteToken);

        // Insert new checkpoint into ring buffer
        checkpointCounts[baseToken][quoteToken] = checkpointCount + 1;
        checkpoints[baseToken][quoteToken][checkpointCount % RING_BUFFER_SIZE] =
            Checkpoint({priceCumulative: priceCumulative, timestamp: block.timestamp});

        // Emit event for off-chain tracking
        emit NewCheckpoint(baseToken, quoteToken, priceCumulative, block.timestamp);
    }

    function updateMinCheckpointInterval(address baseToken, address quoteToken, uint256 interval)
        external
        onlyOwner
    {
        minCheckpointIntervals[baseToken][quoteToken] = interval;
    }

    function getMinCheckpointInterval(address baseToken, address quoteToken)
        private
        view
        returns (uint256 minInterval)
    {
        minInterval = minCheckpointIntervals[baseToken][quoteToken];
        if (minInterval == 0) {
            minInterval = DEFAULT_MIN_CHECKPOINT_INTERVAL;
        }
    }

    function getCheckpointAt(address baseToken, address quoteToken, uint256 index)
        private
        view
        returns (Checkpoint memory checkpoint)
    {
        checkpoint = checkpoints[baseToken][quoteToken][index % RING_BUFFER_SIZE];
    }

    // Adapted from: https://github.com/compound-finance/open-oracle/blob/0e148fdb0e8cbe4d412548490609679621ab2325/contracts/Uniswap/UniswapLib.sol#L42
    function _getCurrentCumulativePrice(address baseToken, address quoteToken)
        private
        view
        returns (uint256 priceCumulative)
    {
        IUniswapV2Pair pair = IUniswapV2Pair(uniswapFactory.getPair(baseToken, quoteToken));
        require(address(pair) != address(0), "UniswapCheckpoints: pair not found");

        uint32 blockTimestamp = currentBlockTimestamp();

        if (uint160(baseToken) < uint160(quoteToken)) {
            // Base token is token0
            priceCumulative = pair.price0CumulativeLast();
        } else {
            // Base token is token1
            priceCumulative = pair.price1CumulativeLast();
        }

        // if time has elapsed since the last update on the pair, mock the accumulated price values
        (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast) = pair.getReserves();
        if (blockTimestampLast != blockTimestamp) {
            unchecked {
                // subtraction overflow is desired
                uint32 timeElapsed = blockTimestamp - blockTimestampLast;
                // addition overflow is desired
                if (uint160(baseToken) < uint160(quoteToken)) {
                    // Base token is token0
                    // counterfactual
                    priceCumulative += uint256(FixedPoint.fraction(reserve1, reserve0)._x) * timeElapsed;
                } else {
                    // Base token is token1
                    // counterfactual
                    priceCumulative += uint256(FixedPoint.fraction(reserve0, reserve1)._x) * timeElapsed;
                }
            }
        }
    }

    function _getLatestCheckpointOlderThan(address baseToken, address quoteToken, uint256 minAge)
        private
        view
        returns (Checkpoint memory checkpoint)
    {
        uint256 checkpointCount = checkpointCounts[baseToken][quoteToken];
        require(checkpointCount > 0, "UniswapCheckpoints: no checkpoint found");

        // Expensive loop. Cost limited by setting min checkpoint interval to reduce iterations
        uint256 indCheckpoint = checkpointCount - 1;
        while (true) {
            Checkpoint memory currentCheckpoint = getCheckpointAt(baseToken, quoteToken, indCheckpoint);
            if (block.timestamp - currentCheckpoint.timestamp >= minAge) {
                return currentCheckpoint;
            }

            // All items checked?
            require(
                indCheckpoint > 0 && checkpointCount - indCheckpoint < RING_BUFFER_SIZE,
                "UniswapCheckpoints: no valid checkpoint"
            );

            indCheckpoint -= 1;
        }
    }

    // Taken from: https://github.com/compound-finance/open-oracle/blob/0e148fdb0e8cbe4d412548490609679621ab2325/contracts/Uniswap/UniswapLib.sol#L37
    function currentBlockTimestamp() private view returns (uint32) {
        return uint32(block.timestamp % 2 ** 32);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.6.12 <0.9.0;

interface IUniswapCheckpoints {
    struct Checkpoint {
        uint256 priceCumulative;
        uint256 timestamp;
    }

    function getCurrentCumulativePrice(address baseToken, address quoteToken)
        external
        view
        returns (uint256 priceCumulative);

    function getLatestCheckpointOlderThan(address baseToken, address quoteToken, uint256 minAge)
        external
        view
        returns (Checkpoint memory checkpoint);

    function makeCheckpoint(address baseToken, address quoteToken) external;
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.6.12 <0.9.0;

// Taken from: https://github.com/Uniswap/v2-core/blob/4dd59067c76dea4a0e8e4bfdda41877a6b16dedc/contracts/interfaces/IUniswapV2Factory.sol

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint256);

    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(uint256) external view returns (address pair);

    function allPairsLength() external view returns (uint256);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;

    function setFeeToSetter(address) external;
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.6.12 <0.9.0;

// Taken from: https://github.com/Uniswap/v2-core/blob/4dd59067c76dea4a0e8e4bfdda41877a6b16dedc/contracts/interfaces/IUniswapV2Pair.sol

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

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

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(address from, address to, uint256 value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s)
        external;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);

    function burn(address to) external returns (uint256 amount0, uint256 amount1);

    function swap(uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity =0.8.15;

// Taken from: https://github.com/compound-finance/open-oracle/blob/0e148fdb0e8cbe4d412548490609679621ab2325/contracts/Uniswap/UniswapLib.sol

// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))
library FixedPoint {
    // range: [0, 2**112 - 1]
    // resolution: 1 / 2**112
    struct uq112x112 {
        uint224 _x;
    }

    // returns a uq112x112 which represents the ratio of the numerator to the denominator
    // equivalent to encode(numerator).div(denominator)
    function fraction(uint112 numerator, uint112 denominator) internal pure returns (uq112x112 memory) {
        require(denominator > 0, "FixedPoint: DIV_BY_ZERO");
        return uq112x112((uint224(numerator) << 112) / denominator);
    }

    // decode a uq112x112 into a uint with 18 decimals of precision
    function decode112with18(uq112x112 memory self) internal pure returns (uint256) {
        // we only have 256 - 224 = 32 bits to spare, so scaling up by ~60 bits is dangerous
        // instead, get close to:
        //  (x * 1e18) >> 112
        // without risk of overflowing, e.g.:
        //  (x) / 2 ** (112 - lg(1e18))
        return uint256(self._x) / 5192296858534827;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @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 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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.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. Equivalent to `reinitializer(1)`.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.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.
     *
     * `initializer` is equivalent to `reinitializer(1)`, so 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.
     *
     * 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.
     */
    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.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @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 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");

        (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");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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);
            }
        }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldCheckpointer","type":"address"},{"indexed":false,"internalType":"address","name":"newCheckpointer","type":"address"}],"name":"CheckpointerUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint8","name":"version","type":"uint8"}],"name":"Initialized","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"baseToken","type":"address"},{"indexed":false,"internalType":"address","name":"quoteToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"priceCumulative","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"NewCheckpoint","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[],"name":"DEFAULT_MIN_CHECKPOINT_INTERVAL","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"RING_BUFFER_SIZE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IUniswapV2Factory","name":"_uniswapFactory","type":"address"}],"name":"__UniswapCheckpoints_init","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"checkpointCounts","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"checkpointer","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"checkpoints","outputs":[{"internalType":"uint256","name":"priceCumulative","type":"uint256"},{"internalType":"uint256","name":"timestamp","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"baseToken","type":"address"},{"internalType":"address","name":"quoteToken","type":"address"}],"name":"getCurrentCumulativePrice","outputs":[{"internalType":"uint256","name":"priceCumulative","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"baseToken","type":"address"},{"internalType":"address","name":"quoteToken","type":"address"},{"internalType":"uint256","name":"minAge","type":"uint256"}],"name":"getLatestCheckpointOlderThan","outputs":[{"components":[{"internalType":"uint256","name":"priceCumulative","type":"uint256"},{"internalType":"uint256","name":"timestamp","type":"uint256"}],"internalType":"struct IUniswapCheckpoints.Checkpoint","name":"checkpoint","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"baseToken","type":"address"},{"internalType":"address","name":"quoteToken","type":"address"}],"name":"makeCheckpoint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"minCheckpointIntervals","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newCheckpointer","type":"address"}],"name":"setCheckpointer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"uniswapFactory","outputs":[{"internalType":"contract IUniswapV2Factory","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"baseToken","type":"address"},{"internalType":"address","name":"quoteToken","type":"address"},{"internalType":"uint256","name":"interval","type":"uint256"}],"name":"updateMinCheckpointInterval","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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