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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import {BASIS_POINTS, hashAddresses, hashWeights, uncheckedInc} from "./Util.sol";
import "openzeppelin-contracts/contracts/access/Ownable.sol";
import {IERC20} from "openzeppelin-contracts/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol";

error CannotReceiveNative();
error TooManyRecipients();
error EmptyRecipients();
error InvalidRecipientGroup(bytes32 currentRecipientGroup, bytes32 providedRecipientGroup);
error InvalidRecipientWeights(bytes32 currentRecipientWeights, bytes32 providedRecipientWeights);
error OwnerFailedRecieve(address owner, address recipient, uint256 value);
error NoFundsToDistribute();
error InputLengthMismatch();
error InvalidTotalWeight(uint256 totalWeight);

/// @title A distributor of ether or an ERC20 token
/// @notice You can use this contract to distribute ether/token according to defined weights between a group of participants managed by an owner.
/// @dev If a particular recipient is not able to recieve funds at their address, the payment will fallback to the owner.
///      A RewardDistributor can only handle a single, specific asset defined at deployment.
///      This contract assumes that the token does not have a blacklist or other non standard behavior.
contract RewardDistributor is Ownable {
    using SafeERC20 for IERC20;

    /// @notice Amount of gas forwarded to each transfer call.
    /// @dev The recipient group is assumed to be a known group of contracts that won't consume more than this amount.
    uint256 public constant PER_RECIPIENT_GAS = 100_000;

    /// @notice The maximum number of addresses that may be recipients.
    /// @dev This ensures that all sends may always happen within a block.
    uint64 public constant MAX_RECIPIENTS = 64;

    IERC20 public immutable token;

    /// @notice Hash of concat'ed recipient group.
    bytes32 public currentRecipientGroup;
    /// @notice Hash of concat'ed recipient weights.
    bytes32 public currentRecipientWeights;

    /// @notice The recipient couldn't receive rewards, so fallback to owner was triggered.
    event OwnerRecieved(address indexed owner, address indexed recipient, uint256 value);

    /// @notice Address successfully received rewards.
    event RecipientRecieved(address indexed recipient, uint256 value);

    /// @notice New recipients have been set
    event RecipientsUpdated(bytes32 recipientGroup, address[] recipients, bytes32 recipientWeights, uint256[] weights);

    /// @notice It is assumed that all recipients are able to receive eth when called with value but no data
    /// @param _token Address of the ERC20 token to distribute. Use address(0) for ether.
    /// @param recipients Addresses to receive rewards.
    /// @param weights Weights of each recipient in basis points.
    constructor(address _token, address[] memory recipients, uint256[] memory weights) Ownable() {
        setRecipients(recipients, weights);
        token = IERC20(_token);
    }

    /// @notice allows eth to be deposited into this contract
    /// @dev this contract is expected to handle ether appearing in its balance as well as an explicit deposit as long as token == address(0)
    receive() external payable {
        if (address(token) != address(0)) {
            revert CannotReceiveNative();
        }
    }

    /**
     * @notice Distributes previous rewards then updates the recipients to a new group.
     * @param currentRecipients Group of addresses that will receive their final rewards.
     * @param currentWeights Weights of the final rewards.
     * @param newRecipients Group of addresses that will receive future rewards.
     * @param newWeights Weights of the future rewards.
     */
    function distributeAndUpdateRecipients(
        address[] memory currentRecipients,
        uint256[] memory currentWeights,
        address[] memory newRecipients,
        uint256[] memory newWeights
    ) external onlyOwner {
        distributeRewards(currentRecipients, currentWeights);
        setRecipients(newRecipients, newWeights);
    }

    /**
     * @notice Sends rewards to the current group of recipients.
     * @dev The remainder will be kept in the contract.
     * @param recipients Group of addresses to receive rewards.
     * @param weights Weights of each recipient in basis points.
     */
    function distributeRewards(address[] memory recipients, uint256[] memory weights) public {
        if (recipients.length == 0) {
            revert EmptyRecipients();
        }

        if (recipients.length != weights.length) {
            revert InputLengthMismatch();
        }

        bytes32 recipientGroup = hashAddresses(recipients);
        if (recipientGroup != currentRecipientGroup) {
            revert InvalidRecipientGroup(currentRecipientGroup, recipientGroup);
        }

        bytes32 recipientWeights = hashWeights(weights);
        if (recipientWeights != currentRecipientWeights) {
            revert InvalidRecipientWeights(currentRecipientWeights, recipientWeights);
        }

        // calculate individual reward
        uint256 rewards = address(token) == address(0) ? address(this).balance : token.balanceOf(address(this));
        // the reminder will be kept in the contract
        uint256 rewardPerBps = rewards / BASIS_POINTS;
        if (rewardPerBps == 0) {
            revert NoFundsToDistribute();
        }
        for (uint256 r; r < recipients.length; r = uncheckedInc(r)) {
            uint256 individualRewards;
            unchecked {
                // we know weights <= BASIS_POINTS
                individualRewards = rewardPerBps * weights[r];
            }
            // send the funds
            // if the recipient reentry to steal funds, the contract will not have sufficient
            // funds and revert when trying to send fund to the next recipient
            // if the recipient is the last, it doesn't matter since there are no extra fund to steal
            bool success;
            if (address(token) == address(0)) {
                (success,) = recipients[r].call{value: individualRewards, gas: PER_RECIPIENT_GAS}("");
            } else {
                // we assume that this will never revert, because we know we have enough token and the token is "normal"
                token.safeTransfer(recipients[r], individualRewards);
                success = true;
            }

            // if the funds failed to send we send them to the owner for safe keeping
            // then the owner will have the opportunity to distribute them out of band
            if (success) {
                emit RecipientRecieved(recipients[r], individualRewards);
            } else {
                // this case will never be hit if we are using an ERC20 token
                // cache owner in memory
                address _owner = owner();
                (bool ownerSuccess,) = _owner.call{value: individualRewards}("");
                // if this is the case then revert and sort it out
                // it's important that this fail in order to preserve the accounting in this contract.
                // if we dont fail here we enable a re-entrancy attack
                if (!ownerSuccess) {
                    revert OwnerFailedRecieve(_owner, recipients[r], individualRewards);
                }
                emit OwnerRecieved(_owner, recipients[r], individualRewards);
            }
        }
    }

    /**
     * @notice Validates and sets the group of recipient addresses. It is assumed that all recipients are able to receive eth
     * @dev We enforce a max number of recipients to ensure the distribution of rewards fits within a block.
     * @param recipients Group of addresses that will receive future rewards.
     * @param weights Weights of each recipient in basis points.
     */
    function setRecipients(address[] memory recipients, uint256[] memory weights) private {
        if (recipients.length == 0) {
            revert EmptyRecipients();
        }
        if (recipients.length != weights.length) {
            revert InputLengthMismatch();
        }
        if (recipients.length > MAX_RECIPIENTS) {
            // it is expected that all sends may happen within the block gas limit
            revert TooManyRecipients();
        }

        // validate that the total weight is 100%
        uint256 totalWeight = 0;
        for (uint256 i; i < weights.length; i = uncheckedInc(i)) {
            totalWeight += weights[i];
        }
        if (totalWeight != BASIS_POINTS) {
            revert InvalidTotalWeight(totalWeight);
        }

        // create a committment to the recipient group and update current
        bytes32 recipientGroup = hashAddresses(recipients);
        currentRecipientGroup = recipientGroup;

        // create a committment to the recipient weights and update current
        bytes32 recipientWeights = hashWeights(weights);
        currentRecipientWeights = recipientWeights;

        emit RecipientsUpdated(recipientGroup, recipients, recipientWeights, weights);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

uint256 constant BASIS_POINTS = 10000;

// utility free functions

/// @notice sequentially hashes an array of addresses
/// @param addresses array of addresses to be hashed
function hashAddresses(address[] memory addresses) pure returns (bytes32 res) {
    assembly ("memory-safe") {
        // same as keccak256(abi.encodePacked(addresses))
        // save gas since the array is already in the memory
        // we skip the first 32 bytes (length) and hash the next length * 32 bytes
        res := keccak256(add(addresses, 32), mul(mload(addresses), 32))
    }
}

/// @notice sequentially hashes an array of weights
/// @param weights array of weights to be hashed
function hashWeights(uint256[] memory weights) pure returns (bytes32 res) {
    assembly ("memory-safe") {
        // same as keccak256(abi.encodePacked(weights))
        // save gas since the array is already in the memory
        // we skip the first 32 bytes (length) and hash the next length * 32 bytes
        res := keccak256(add(weights, 32), mul(mload(weights), 32))
    }
}

/// @notice increments an integer without checking for overflows
/// @dev from https://github.com/ethereum/solidity/issues/11721#issuecomment-890917517
function uncheckedInc(uint256 x) pure returns (uint256) {
    unchecked {
        return x + 1;
    }
}

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

pragma solidity ^0.8.0;

import "../utils/Context.sol";

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

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _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);
    }
}

// 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 v4.7.0) (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");
        }
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

// 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);
}

// 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 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 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 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) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(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);
            }
        }
    }
}

{
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "nitro-contracts/=lib/nitro-contracts/",
    "@arbitrum/=lib/arbitrum-sdk/node_modules/@arbitrum/nitro-contracts/src/",
    "@offchainlabs/=lib/arbitrum-sdk/node_modules/@offchainlabs/upgrade-executor/src/",
    "@openzeppelin/=lib/arbitrum-sdk/node_modules/@openzeppelin/",
    "hardhat/=lib/arbitrum-sdk/node_modules/hardhat/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 20000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "viaIR": false,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address[]","name":"recipients","type":"address[]"},{"internalType":"uint256[]","name":"weights","type":"uint256[]"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"CannotReceiveNative","type":"error"},{"inputs":[],"name":"EmptyRecipients","type":"error"},{"inputs":[],"name":"InputLengthMismatch","type":"error"},{"inputs":[{"internalType":"bytes32","name":"currentRecipientGroup","type":"bytes32"},{"internalType":"bytes32","name":"providedRecipientGroup","type":"bytes32"}],"name":"InvalidRecipientGroup","type":"error"},{"inputs":[{"internalType":"bytes32","name":"currentRecipientWeights","type":"bytes32"},{"internalType":"bytes32","name":"providedRecipientWeights","type":"bytes32"}],"name":"InvalidRecipientWeights","type":"error"},{"inputs":[{"internalType":"uint256","name":"totalWeight","type":"uint256"}],"name":"InvalidTotalWeight","type":"error"},{"inputs":[],"name":"NoFundsToDistribute","type":"error"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"OwnerFailedRecieve","type":"error"},{"inputs":[],"name":"TooManyRecipients","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"OwnerRecieved","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"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"RecipientRecieved","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"recipientGroup","type":"bytes32"},{"indexed":false,"internalType":"address[]","name":"recipients","type":"address[]"},{"indexed":false,"internalType":"bytes32","name":"recipientWeights","type":"bytes32"},{"indexed":false,"internalType":"uint256[]","name":"weights","type":"uint256[]"}],"name":"RecipientsUpdated","type":"event"},{"inputs":[],"name":"MAX_RECIPIENTS","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PER_RECIPIENT_GAS","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"currentRecipientGroup","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"currentRecipientWeights","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"currentRecipients","type":"address[]"},{"internalType":"uint256[]","name":"currentWeights","type":"uint256[]"},{"internalType":"address[]","name":"newRecipients","type":"address[]"},{"internalType":"uint256[]","name":"newWeights","type":"uint256[]"}],"name":"distributeAndUpdateRecipients","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"recipients","type":"address[]"},{"internalType":"uint256[]","name":"weights","type":"uint256[]"}],"name":"distributeRewards","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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-----Decoded View---------------
Arg [0] : _token (address): 0x722E8BdD2ce80A4422E880164f2079488e115365
Arg [1] : recipients (address[]): 0x7C058ad1D0Ee415f7e7f30e62DB1BCf568470a10,0x6A075E9a02eef6978DD66cB63DE430a8c0C419E9
Arg [2] : weights (uint256[]): 9700,300

-----Encoded View---------------
9 Constructor Arguments found :
Arg [0] : 000000000000000000000000722e8bdd2ce80a4422e880164f2079488e115365
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [2] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [4] : 0000000000000000000000007c058ad1d0ee415f7e7f30e62db1bcf568470a10
Arg [5] : 0000000000000000000000006a075e9a02eef6978dd66cb63de430a8c0c419e9
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [7] : 00000000000000000000000000000000000000000000000000000000000025e4
Arg [8] : 000000000000000000000000000000000000000000000000000000000000012c