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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.27;

import {UUPSUpgradeable} from "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";
import {AccessControlUpgradeable} from "@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol";
import {Address} from "@openzeppelin/contracts/utils/Address.sol";
import {ISfc} from "./interfaces/ISfc.sol";
import {IGasMonetization} from "./interfaces/IGasMonetization.sol";

/**
 * @title Fee Monetization (formerly Gas Monetization) for the Sonic network
 * @custom:security-contact [email protected]
 */
contract GasMonetization is AccessControlUpgradeable, UUPSUpgradeable, IGasMonetization {
    using Address for address payable;

    event FundsAdded(address indexed funder, uint256 amount);
    event FundsWithdrawn(address indexed recipient, uint256 amount);
    event ProjectAdded(
        uint256 indexed projectId,
        address indexed owner,
        address indexed rewardsRecipient,
        string metadataUri,
        uint256 activeFromEpoch,
        address[] contracts
    );
    event ProjectSuspended(uint256 indexed projectId, uint256 suspendedOnEpochNumber);
    event ProjectEnabled(uint256 indexed projectId, uint256 enabledOnEpochNumber);
    event ProjectContractAdded(uint256 indexed projectId, address indexed contractAddress);
    event ProjectContractRemoved(uint256 indexed projectId, address indexed contractAddress);
    event ProjectMetadataUriUpdated(uint256 indexed projectId, string metadataUri);
    event ProjectRewardsRecipientUpdated(uint256 indexed projectId, address recipient);
    event ProjectOwnerUpdated(uint256 indexed projectId, address owner);
    event RewardClaimRequested(uint256 indexed projectId, uint256 requestEpochNumber);
    event RewardClaimCompleted(uint256 indexed projectId, uint256 epochNumber, uint256 amount);
    event RewardClaimCanceled(uint256 indexed projectId, uint256 epochNumber);
    event InvalidRewardClaimAmount(
        uint256 indexed projectId,
        uint256 requestEpochNumber,
        uint256 amount,
        uint256 diffAmount
    );
    event ValidatorsRewarded(uint256 indexed startEpoch, uint256 indexed endEpoch, uint256 amount);
    event InvalidValidatorsRewardingConfirmation(
        uint256 indexed startEpoch,
        uint256 indexed newEndEpoch,
        uint256 indexed oldEndEpoch,
        uint256 newAmount,
        uint256 oldAmount
    );
    event RewardClaimEpochsLimitUpdated(uint256 limit);
    event RewardClaimConfirmationsLimitUpdated(uint256 limit);
    event SfcAddressUpdated(address sfcAddress);

    /**
     * @notice Accounts with this role are eligible to fund this contract.
     */
    bytes32 public constant FUNDER_ROLE = keccak256("FUNDER");

    /**
     * @notice Accounts with this role are eligible to handle funds of this contract.
     */
    bytes32 public constant FUNDS_MANAGER_ROLE = keccak256("FUNDS_MANAGER");

    /**
     * @notice Accounts with this role are eligible to manage projects.
     */
    bytes32 public constant PROJECTS_MANAGER_ROLE = keccak256("PROJECTS_MANAGER");

    /**
     * @notice Accounts with this role are eligible to provide data related to reward claims.
     */
    bytes32 public constant REWARDS_ORACLE_ROLE = keccak256("REWARDS_ORACLE");

    /**
     * @notice A project eligible to claim rewards.
     */
    struct Project {
        address owner;
        address rewardsRecipient;
        string metadataUri;
        uint256 lastClaimEpoch;
        uint256 activeFromEpoch;
        // Used for disabled projects, when the value is 0, the project is still active.
        uint256 activeToEpoch;
    }

    /**
     * @notice The registry of projects implemented as "project id" => "project" mapping.
     */
    mapping(uint256 projectId => Project) public projects;

    /**
     * @notice The registry of contracts assigned to projects implemented as "contract address" => "project id" mapping.
     */
    mapping(address contractAddress => uint256 projectId) public contracts;

    /**
     * @notice The SFC contract used for obtaining current epoch.
     */
    ISfc public sfc;

    /**
     * @notice Restricts reward claims frequency by specified epochs number.
     */
    uint256 public minEpochsBetweenClaims;

    /**
     * @notice The amount of confirmations we need to make a reward claim.
     */
    uint256 public requiredRewardClaimConfirmations;

    /**
     * @notice The last epoch id when this contract was funded.
     */
    uint256 public lastFundedEpoch;

    /**
     * @notice PendingRewardClaimRequest represents a pending reward claim of a project.
     */
    struct PendingRewardClaimRequest {
        uint256 requestedOnEpoch;
        uint256 confirmationsCount;
        uint256 confirmedAmount;
        // Array of rewards oracles, which have confirmed the request.
        address[] confirmedBy;
    }

    /**
     * @notice Registry of pending reward claims implemented as "project id" => "pending reward claim" mapping.
     */
    mapping(uint256 projectId => PendingRewardClaimRequest) public pendingRewardClaims;

    /**
     * @notice The highest used project id.
     */
    uint256 public lastProjectId;

    /**
     * @dev Registry of project owners implemented as "owner address" => "project id" mapping.
     * Owner can have only one project.
     */
    mapping(address owner => uint256 projectId) public ownedProject;

    /**
     * @notice The last epoch for which was validators rewards awarded.
     */
    uint256 public lastValidatorsRewardingEpoch;

    /**
     * @notice A pending validators reward awarding request.
     */
    struct PendingValidatorsReward {
        uint256 endEpoch;
        uint256 amount;
        // Array of rewards oracles, which have confirmed the request.
        address[] confirmedBy;
    }

    /**
     * @notice The current pending validators reward awarding request.
     */
    PendingValidatorsReward public pendingValidatorsReward;

    /** @custom:oz-upgrades-unsafe-allow constructor */
    constructor() {
        _disableInitializers();
    }

    /**
     * @notice Initialize the contract.
     * @param admin Address of admin.
     * @param sfcAddress Address of SFC contract.
     * @param rewardClaimEpochsFrequencyLimit Limits how often withdrawals can be done.
     * @param rewardClaimRequiredConfirmations Required confirmations to make claim.
     */
    function initialize(
        address admin,
        address sfcAddress,
        uint256 rewardClaimEpochsFrequencyLimit,
        uint256 rewardClaimRequiredConfirmations
    ) external initializer {
        __AccessControl_init();
        __UUPSUpgradeable_init();
        sfc = ISfc(sfcAddress);
        minEpochsBetweenClaims = rewardClaimEpochsFrequencyLimit;
        requiredRewardClaimConfirmations = rewardClaimRequiredConfirmations;
        _grantRole(DEFAULT_ADMIN_ROLE, admin);
        // set sfc as funder by default
        _grantRole(FUNDER_ROLE, sfcAddress);
        // set funds manager role by default to adin
        _grantRole(FUNDS_MANAGER_ROLE, admin);
    }

    /**
     * @notice New reward claim. Only project owner can request.
     * @param projectId Id of project.
     */
    function newRewardClaim(uint256 projectId) external {
        require(projects[projectId].owner == _msgSender(), "GasMonetization: not owner");
        require(pendingRewardClaims[projectId].requestedOnEpoch == 0, "GasMonetization: has pending claim");
        require(
            projects[projectId].activeToEpoch == 0 ||
                projects[projectId].lastClaimEpoch < projects[projectId].activeToEpoch,
            "GasMonetization: project disabled"
        );
        uint256 epoch = sfc.currentSealedEpoch();
        uint256 lastProjectClaimEpoch = projects[projectId].lastClaimEpoch;
        require(
            lastProjectClaimEpoch < lastFundedEpoch && epoch - lastProjectClaimEpoch > minEpochsBetweenClaims,
            "GasMonetization: must wait to claim"
        );
        // prepare new claim
        pendingRewardClaims[projectId].requestedOnEpoch = epoch;
        emit RewardClaimRequested(projectId, epoch);
    }

    /**
     * @notice Confirm reward claim.
     * @param projectId Id of project.
     * @param epochNumber Number of epoch when request was made.
     * @param amount Amount that owner should receive.
     */
    function confirmRewardClaim(uint256 projectId, uint256 epochNumber, uint256 amount) external {
        require(hasRole(REWARDS_ORACLE_ROLE, _msgSender()), "GasMonetization: not rewards oracle");
        require(hasPendingRewardClaim(projectId, epochNumber), "GasMonetization: no claim request");
        PendingRewardClaimRequest storage request = pendingRewardClaims[projectId];
        // set amount when it is the first confirmation
        if (request.confirmationsCount == 0) {
            request.confirmedAmount = amount;
        } else if (request.confirmedAmount != amount) {
            // otherwise if amount is different, invalidate data we obtained so far
            // and emit event, so next attempt can be made
            emit InvalidRewardClaimAmount(projectId, epochNumber, request.confirmedAmount, amount);
            delete pendingRewardClaims[projectId];
            request.requestedOnEpoch = epochNumber;
            return;
        }
        // validate that provider has not already provided data
        for (uint256 i = 0; i < request.confirmedBy.length; ++i) {
            require(request.confirmedBy[i] != _msgSender(), "GasMonetization: already provided");
        }
        // send amount if confirmations threshold is reached and delete request
        if (request.confirmationsCount + 1 >= requiredRewardClaimConfirmations) {
            delete pendingRewardClaims[projectId];
            projects[projectId].lastClaimEpoch = epochNumber;
            if (amount > 0) {
                payable(projects[projectId].rewardsRecipient).sendValue(amount);
            }
            emit RewardClaimCompleted(projectId, epochNumber, amount);
            return;
        }
        // gas optimization
        request.confirmedBy.push(_msgSender());
        request.confirmationsCount++;
    }

    /**
     * @notice Cancel reward claim request.
     * @param projectId Id of project.
     * @param epochNumber Epoch number of claim request.
     */
    function cancelRewardClaim(uint256 projectId, uint256 epochNumber) external {
        require(hasPendingRewardClaim(projectId, epochNumber), "GasMonetization: no claim request");
        PendingRewardClaimRequest storage request = pendingRewardClaims[projectId];
        // only owner or data provider can cancel claim request
        if (projects[projectId].owner == _msgSender()) {
            // also owner must wait to cancel claim request until claim epoch limit is reached
            require(
                sfc.currentEpoch() - request.requestedOnEpoch > minEpochsBetweenClaims,
                "GasMonetization: must wait to cancel"
            );
        } else {
            require(hasRole(PROJECTS_MANAGER_ROLE, _msgSender()), "GasMonetization: not projects manager or owner");
        }
        delete pendingRewardClaims[projectId];
        emit RewardClaimCanceled(projectId, epochNumber);
    }

    /**
     * @notice Confirm validators rewards for an epoch range.
     * @param startEpoch The first epoch of the epoch range.
     * @param endEpoch The last epoch of the epoch range.
     * @param amount The reward that network validators should receive for the period.
     */
    function confirmValidatorsReward(uint256 startEpoch, uint256 endEpoch, uint256 amount) external {
        require(startEpoch <= endEpoch, "FeeM: invalid epoch range");
        require(startEpoch == lastValidatorsRewardingEpoch + 1, "FeeM: non-continuing epoch range");
        require(hasRole(REWARDS_ORACLE_ROLE, _msgSender()), "FeeM: not rewards oracle");
        PendingValidatorsReward storage pending = pendingValidatorsReward;

        // set pending request when it is the first confirmation
        if (pending.confirmedBy.length == 0) {
            pending.endEpoch = endEpoch;
            pending.amount = amount;
        } else if (pending.endEpoch != endEpoch || pending.amount != amount) {
            emit InvalidValidatorsRewardingConfirmation(startEpoch, endEpoch, pending.endEpoch, amount, pending.amount);
            pending.endEpoch = endEpoch;
            pending.amount = amount;
            delete pending.confirmedBy; // invalidate confirmations we obtained so far
            // continue - give the first confirmation for the new values
        }
        // validate that provider has not already provided data
        for (uint256 i = 0; i < pending.confirmedBy.length; ++i) {
            require(pending.confirmedBy[i] != _msgSender(), "FeeM: duplicate confirmation");
        }
        // send the reward if confirmations threshold is reached and delete request
        if (pending.confirmedBy.length + 1 >= requiredRewardClaimConfirmations) {
            delete pendingValidatorsReward;
            lastValidatorsRewardingEpoch = endEpoch;
            if (amount > 0) {
                sfc.distributeExtraReward{value: amount}(endEpoch, true);
            }
            emit ValidatorsRewarded(startEpoch, endEpoch, amount);
        } else {
            pending.confirmedBy.push(_msgSender());
        }
    }

    /**
     * @notice Add project into registry. This method needs to be called after reserving project id.
     * @param projectId Id of project - must be reserved before.
     * @param owner Address of project owner.
     * @param rewardsRecipient Address of rewards receiver.
     * @param metadataUri Uri of project's metadata.
     * @param projectContracts Array of related contracts.
     */
    function addProject(
        uint256 projectId,
        address owner,
        address rewardsRecipient,
        string calldata metadataUri,
        address[] calldata projectContracts
    ) public {
        require(hasRole(PROJECTS_MANAGER_ROLE, _msgSender()), "GasMonetization: not projects manager");
        // project id must be reserved before and must be in valid range
        require(projectId != 0 && projectId <= lastProjectId, "GasMonetization: projectId not reserved");
        require(projects[projectId].owner == address(0), "GasMonetization: project already exists");
        // owner must be set and must not have any other project
        require(owner != address(0), "GasMonetization: empty owner");
        require(ownedProject[owner] == 0, "GasMonetization: owner already has project");
        require(rewardsRecipient != address(0), "GasMonetization: empty rewards recipient");
        require(bytes(metadataUri).length > 0, "GasMonetization: empty metadata uri");
        // add project
        projects[projectId] = Project({
            owner: owner,
            rewardsRecipient: rewardsRecipient,
            metadataUri: metadataUri,
            lastClaimEpoch: 0,
            activeFromEpoch: sfc.currentEpoch(),
            activeToEpoch: 0
        });
        // add contracts
        for (uint256 i = 0; i < projectContracts.length; ++i) {
            require(contracts[projectContracts[i]] == 0, "GasMonetization: contract already registered");
            contracts[projectContracts[i]] = projectId;
        }
        // add owner
        ownedProject[owner] = projectId;
        emit ProjectAdded(
            projectId,
            projects[projectId].owner,
            projects[projectId].rewardsRecipient,
            projects[projectId].metadataUri,
            projects[projectId].activeFromEpoch,
            projectContracts
        );
    }

    /**
     * @notice Reserve project ID to be used in `AddProject` method.
     * @dev This method is used to reserve project ID before adding project.
     * @return Project ID.
     */
    function reserveProjectId() external returns (uint256) {
        require(hasRole(PROJECTS_MANAGER_ROLE, _msgSender()), "GasMonetization: not projects manager");
        lastProjectId++;
        return lastProjectId;
    }

    /**
     * @notice Add project into registry. This method will resolve project id automatically.
     * @param owner Address of project owner.
     * @param rewardsRecipient Address of rewards receiver.
     * @param metadataUri Uri of project's metadata.
     * @param projectContracts Array of related contracts.
     */
    function addProject(
        address owner,
        address rewardsRecipient,
        string calldata metadataUri,
        address[] calldata projectContracts
    ) external {
        lastProjectId++;
        addProject(lastProjectId, owner, rewardsRecipient, metadataUri, projectContracts);
    }

    /**
     * @notice Suspend project from receiving rewards.
     * @param projectId Id of project.
     */
    function suspendProject(uint256 projectId) external {
        require(hasRole(PROJECTS_MANAGER_ROLE, _msgSender()), "GasMonetization: not projects manager");
        require(projects[projectId].owner != address(0), "GasMonetization: project does not exist");
        require(projects[projectId].activeToEpoch == 0, "GasMonetization: project suspended");
        projects[projectId].activeToEpoch = sfc.currentEpoch();
        emit ProjectSuspended(projectId, projects[projectId].activeToEpoch);
    }

    /**
     * @notice Enable project to receive rewards.
     * @param projectId Id of project.
     */
    function enableProject(uint256 projectId) external {
        require(hasRole(PROJECTS_MANAGER_ROLE, _msgSender()), "GasMonetization: not projects manager");
        require(projects[projectId].owner != address(0), "GasMonetization: project does not exist");
        require(projects[projectId].activeToEpoch != 0, "GasMonetization: project active");
        projects[projectId].activeFromEpoch = sfc.currentEpoch();
        projects[projectId].activeToEpoch = 0;
        emit ProjectEnabled(projectId, projects[projectId].activeFromEpoch);
    }

    /**
     * @notice Add project contract into registry.
     * @param projectId Id of project.
     * @param contractAddress Address of project's contract.
     */
    function addProjectContract(uint256 projectId, address contractAddress) external {
        require(projects[projectId].owner != address(0), "GasMonetization: project does not exist");
        require(hasRole(PROJECTS_MANAGER_ROLE, _msgSender()), "GasMonetization: not projects manager");
        require(projects[projectId].activeToEpoch == 0, "GasMonetization: project suspended");
        _addProjectContract(projectId, contractAddress);
    }

    /**
     * @notice Add multiple project contracts into registry.
     * @param projectId Id of project.
     * @param contractAddresses Array of project's contract addresses.
     */
    function addProjectContracts(uint256 projectId, address[] calldata contractAddresses) external {
        require(projects[projectId].owner != address(0), "GasMonetization: project does not exist");
        require(hasRole(PROJECTS_MANAGER_ROLE, _msgSender()), "GasMonetization: not projects manager");
        require(projects[projectId].activeToEpoch == 0, "GasMonetization: project suspended");
        for (uint256 i = 0; i < contractAddresses.length; ++i) {
            _addProjectContract(projectId, contractAddresses[i]);
        }
    }

    /**
     * @notice Remove project contract from registry.
     * @param projectId Id of project.
     * @param contractAddress Address of contract.
     */
    function removeProjectContract(uint256 projectId, address contractAddress) external {
        require(projects[projectId].owner != address(0), "GasMonetization: project does not exist");
        require(
            projects[projectId].owner == _msgSender() || hasRole(PROJECTS_MANAGER_ROLE, _msgSender()),
            "GasMonetization: not projects manager or owner"
        );
        _removeProjectContract(projectId, contractAddress);
    }

    /**
     * @notice Remove multiple project contracts from registry.
     * @param projectId Id of project.
     * @param contractAddresses Array of contract addresses.
     */
    function removeProjectContracts(uint256 projectId, address[] calldata contractAddresses) external {
        require(projects[projectId].owner != address(0), "GasMonetization: project does not exist");
        require(
            projects[projectId].owner == _msgSender() || hasRole(PROJECTS_MANAGER_ROLE, _msgSender()),
            "GasMonetization: not projects manager or owner"
        );
        for (uint256 i = 0; i < contractAddresses.length; ++i) {
            _removeProjectContract(projectId, contractAddresses[i]);
        }
    }

    /**
     * @notice Update project's metadata uri.
     * @param projectId Id of project.
     * @param metadataUri Uri of project's metadata.
     */
    function updateProjectMetadataUri(uint256 projectId, string calldata metadataUri) external {
        require(projects[projectId].owner != address(0), "GasMonetization: project does not exist");
        require(
            projects[projectId].owner == _msgSender() || hasRole(PROJECTS_MANAGER_ROLE, _msgSender()),
            "GasMonetization: not projects manager or owner"
        );
        require(bytes(metadataUri).length > 0, "GasMonetization: empty metadata uri");
        projects[projectId].metadataUri = metadataUri;
        emit ProjectMetadataUriUpdated(projectId, metadataUri);
    }

    /**
     * @notice Update project's rewards recipient.
     * @param projectId Id of project.
     * @param recipient Address of recipient.
     */
    function updateProjectRewardsRecipient(uint256 projectId, address recipient) external {
        require(projects[projectId].owner != address(0), "GasMonetization: project does not exist");
        require(
            projects[projectId].owner == _msgSender() || hasRole(PROJECTS_MANAGER_ROLE, _msgSender()),
            "GasMonetization: not projects manager or owner"
        );
        projects[projectId].rewardsRecipient = recipient;
        emit ProjectRewardsRecipientUpdated(projectId, recipient);
    }

    /**
     * @notice Update project's owner.
     * @param projectId Id of project.
     * @param newOwner Address of owner.
     */
    function updateProjectOwner(uint256 projectId, address newOwner) external {
        address oldOwner = projects[projectId].owner;
        require(oldOwner != address(0), "GasMonetization: project does not exist");
        require(
            oldOwner == _msgSender() || hasRole(PROJECTS_MANAGER_ROLE, _msgSender()),
            "GasMonetization: not projects manager or owner"
        );
        require(ownedProject[newOwner] == 0, "GasMonetization: owner already has project");
        // set new owner and remove old one
        ownedProject[oldOwner] = 0;
        ownedProject[newOwner] = projectId;
        projects[projectId].owner = newOwner;
        emit ProjectOwnerUpdated(projectId, newOwner);
    }

    /**
     * @notice Add funds.
     */
    function addFunds() public payable {
        require(hasRole(FUNDER_ROLE, _msgSender()), "GasMonetization: not funder");
        require(msg.value > 0, "GasMonetization: no funds sent");
        lastFundedEpoch = sfc.currentSealedEpoch();
        emit FundsAdded(_msgSender(), msg.value);
    }

    /**
     * @notice Withdraw funds.
     * @param recipient Address of recipient.
     * @param amount Amount to be withdrawn.
     */
    function withdrawFunds(address payable recipient, uint256 amount) external {
        require(hasRole(FUNDS_MANAGER_ROLE, _msgSender()), "GasMonetization: not funds manager");
        recipient.sendValue(amount);
        emit FundsWithdrawn(recipient, amount);
    }

    /**
     * @notice Withdraw all funds.
     * @param recipient Address of recipient.
     */
    function withdrawAllFunds(address payable recipient) external {
        require(hasRole(FUNDS_MANAGER_ROLE, _msgSender()), "GasMonetization: not funds manager");
        uint256 balance = address(this).balance;
        recipient.sendValue(balance);
        emit FundsWithdrawn(recipient, balance);
    }

    /**
     * @notice Update reward claim epochs frequency limit.
     * @param limit New limit.
     */
    function updateRewardClaimEpochsFrequencyLimit(uint256 limit) external {
        require(hasRole(DEFAULT_ADMIN_ROLE, _msgSender()), "GasMonetization: not admin");
        minEpochsBetweenClaims = limit;
        emit RewardClaimEpochsLimitUpdated(limit);
    }

    /**
     * @notice Update reward claim required confirmations.
     * @param limit New limit.
     */
    function updateRewardClaimRequiredConfirmations(uint256 limit) public {
        require(hasRole(DEFAULT_ADMIN_ROLE, _msgSender()), "GasMonetization: not admin");
        requiredRewardClaimConfirmations = limit;
        emit RewardClaimConfirmationsLimitUpdated(limit);
    }

    /**
     * @notice Update sfc address.
     * @param newSfc New sfc address.
     */
    function updateSfcAddress(address newSfc) external {
        require(hasRole(DEFAULT_ADMIN_ROLE, _msgSender()), "GasMonetization: not admin");
        sfc = ISfc(newSfc);
        emit SfcAddressUpdated(newSfc);
    }

    /**
     * @notice Check owner has pending reward claim on given epoch id.
     * @param projectId Id of project.
     * @param epochId Id of epoch when request was made.
     */
    function hasPendingRewardClaim(uint256 projectId, uint256 epochId) public view returns (bool) {
        return pendingRewardClaims[projectId].requestedOnEpoch == epochId;
    }

    /**
     * @notice Get project owner.
     * @param projectId Project id.
     */
    function getProjectOwner(uint256 projectId) external view returns (address) {
        return projects[projectId].owner;
    }

    /**
     * @notice Get project rewards recipient.
     * @param projectId Project id.
     */
    function getProjectRewardsRecipient(uint256 projectId) external view returns (address) {
        return projects[projectId].rewardsRecipient;
    }

    /**
     * @notice Get project metadata uri.
     * @param projectId Project id.
     */
    function getProjectMetadataUri(uint256 projectId) external view returns (string memory) {
        return projects[projectId].metadataUri;
    }

    /**
     * @notice Get project last claim epoch.
     * @param projectId Project id.
     */
    function getProjectLastClaimEpoch(uint256 projectId) external view returns (uint256) {
        return projects[projectId].lastClaimEpoch;
    }

    /**
     * @notice Get project active from epoch.
     * @param projectId Project id.
     */
    function getProjectActiveFromEpoch(uint256 projectId) external view returns (uint256) {
        return projects[projectId].activeFromEpoch;
    }

    /**
     * @notice Get project active to epoch.
     * @param projectId Project id.
     */
    function getProjectActiveToEpoch(uint256 projectId) external view returns (uint256) {
        return projects[projectId].activeToEpoch;
    }

    /**
     * @notice Get project id of given contract.
     * @param contractAddress Address of a contract.
     */
    function getProjectIdOfContract(address contractAddress) external view returns (uint256) {
        return contracts[contractAddress];
    }

    /**
     * @notice Get epoch of pending reward claim for given project id.
     * @param projectId Project id.
     */
    function getPendingRewardClaimEpoch(uint256 projectId) external view returns (uint256) {
        return pendingRewardClaims[projectId].requestedOnEpoch;
    }

    /**
     * @notice Get pending reward claim confirmations count.
     * @param projectId Project id.
     */
    function getPendingRewardClaimConfirmationsCount(uint256 projectId) public view returns (uint256) {
        return pendingRewardClaims[projectId].confirmationsCount;
    }

    /**
     * @notice Get pending reward claim confirmed amount.
     * @param projectId Project id.
     */
    function getPendingRewardClaimConfirmedAmount(uint256 projectId) public view returns (uint256) {
        return pendingRewardClaims[projectId].confirmedAmount;
    }

    /**
     * @notice Get pending reward claim addresses confirming current claim.
     * @param projectId Project id.
     */
    function getPendingRewardClaimConfirmedBy(uint256 projectId) public view returns (address[] memory) {
        return pendingRewardClaims[projectId].confirmedBy;
    }

    /**
     * @notice Get addresses confirming pending validators rewarding.
     */
    function getPendingValidatorsRewardConfirmedBy() public view returns (address[] memory) {
        return pendingValidatorsReward.confirmedBy;
    }

    /**
     * @notice Receive function implementation to handle adding funds directly via "send" or "transfer" methods.
     */
    receive() external payable {
        addFunds();
    }

    /**
     * @notice Internal function to add project contract into registry.
     * @param projectId Id of project.
     * @param contractAddress Address of project's contract.
     */
    function _addProjectContract(uint256 projectId, address contractAddress) internal {
        require(contracts[contractAddress] == 0, "GasMonetization: contract already registered");
        contracts[contractAddress] = projectId;
        emit ProjectContractAdded(projectId, contractAddress);
    }

    /**
     * @notice Internal function to remove project contract from registry.
     * @param projectId Id of project.
     * @param contractAddress Address of project's contract.
     */
    function _removeProjectContract(uint256 projectId, address contractAddress) internal {
        require(contracts[contractAddress] == projectId, "GasMonetization: contract not registered");
        delete contracts[contractAddress];
        emit ProjectContractRemoved(projectId, contractAddress);
    }

    /**
     * @dev Override the upgrade authorization check to allow upgrades only from the owner.
     */
    // solhint-disable-next-line no-empty-blocks
    function _authorizeUpgrade(address) internal override onlyRole(DEFAULT_ADMIN_ROLE) {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/AccessControl.sol)

pragma solidity ^0.8.20;

import {IAccessControl} from "@openzeppelin/contracts/access/IAccessControl.sol";
import {ContextUpgradeable} from "../utils/ContextUpgradeable.sol";
import {ERC165Upgradeable} from "../utils/introspection/ERC165Upgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControlUpgradeable is Initializable, ContextUpgradeable, IAccessControl, ERC165Upgradeable {
    struct RoleData {
        mapping(address account => bool) hasRole;
        bytes32 adminRole;
    }

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;


    /// @custom:storage-location erc7201:openzeppelin.storage.AccessControl
    struct AccessControlStorage {
        mapping(bytes32 role => RoleData) _roles;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.AccessControl")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant AccessControlStorageLocation = 0x02dd7bc7dec4dceedda775e58dd541e08a116c6c53815c0bd028192f7b626800;

    function _getAccessControlStorage() private pure returns (AccessControlStorage storage $) {
        assembly {
            $.slot := AccessControlStorageLocation
        }
    }

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with an {AccessControlUnauthorizedAccount} error including the required role.
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    function __AccessControl_init() internal onlyInitializing {
    }

    function __AccessControl_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual returns (bool) {
        AccessControlStorage storage $ = _getAccessControlStorage();
        return $._roles[role].hasRole[account];
    }

    /**
     * @dev Reverts with an {AccessControlUnauthorizedAccount} error if `_msgSender()`
     * is missing `role`. Overriding this function changes the behavior of the {onlyRole} modifier.
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Reverts with an {AccessControlUnauthorizedAccount} error if `account`
     * is missing `role`.
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert AccessControlUnauthorizedAccount(account, role);
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual returns (bytes32) {
        AccessControlStorage storage $ = _getAccessControlStorage();
        return $._roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `callerConfirmation`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address callerConfirmation) public virtual {
        if (callerConfirmation != _msgSender()) {
            revert AccessControlBadConfirmation();
        }

        _revokeRole(role, callerConfirmation);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        AccessControlStorage storage $ = _getAccessControlStorage();
        bytes32 previousAdminRole = getRoleAdmin(role);
        $._roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Attempts to grant `role` to `account` and returns a boolean indicating if `role` was granted.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual returns (bool) {
        AccessControlStorage storage $ = _getAccessControlStorage();
        if (!hasRole(role, account)) {
            $._roles[role].hasRole[account] = true;
            emit RoleGranted(role, account, _msgSender());
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Attempts to revoke `role` to `account` and returns a boolean indicating if `role` was revoked.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual returns (bool) {
        AccessControlStorage storage $ = _getAccessControlStorage();
        if (hasRole(role, account)) {
            $._roles[role].hasRole[account] = false;
            emit RoleRevoked(role, account, _msgSender());
            return true;
        } else {
            return false;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.20;

/**
 * @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]
 * ```solidity
 * 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 Storage of the initializable contract.
     *
     * It's implemented on a custom ERC-7201 namespace to reduce the risk of storage collisions
     * when using with upgradeable contracts.
     *
     * @custom:storage-location erc7201:openzeppelin.storage.Initializable
     */
    struct InitializableStorage {
        /**
         * @dev Indicates that the contract has been initialized.
         */
        uint64 _initialized;
        /**
         * @dev Indicates that the contract is in the process of being initialized.
         */
        bool _initializing;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Initializable")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant INITIALIZABLE_STORAGE = 0xf0c57e16840df040f15088dc2f81fe391c3923bec73e23a9662efc9c229c6a00;

    /**
     * @dev The contract is already initialized.
     */
    error InvalidInitialization();

    /**
     * @dev The contract is not initializing.
     */
    error NotInitializing();

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint64 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 in the context of a constructor an `initializer` may be invoked any
     * number of times. This behavior in the constructor can be useful during testing and is not expected to be used in
     * production.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        // Cache values to avoid duplicated sloads
        bool isTopLevelCall = !$._initializing;
        uint64 initialized = $._initialized;

        // Allowed calls:
        // - initialSetup: the contract is not in the initializing state and no previous version was
        //                 initialized
        // - construction: the contract is initialized at version 1 (no reininitialization) and the
        //                 current contract is just being deployed
        bool initialSetup = initialized == 0 && isTopLevelCall;
        bool construction = initialized == 1 && address(this).code.length == 0;

        if (!initialSetup && !construction) {
            revert InvalidInitialization();
        }
        $._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 2**64 - 1 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint64 version) {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing || $._initialized >= version) {
            revert InvalidInitialization();
        }
        $._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() {
        _checkInitializing();
        _;
    }

    /**
     * @dev Reverts if the contract is not in an initializing state. See {onlyInitializing}.
     */
    function _checkInitializing() internal view virtual {
        if (!_isInitializing()) {
            revert NotInitializing();
        }
    }

    /**
     * @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 {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing) {
            revert InvalidInitialization();
        }
        if ($._initialized != type(uint64).max) {
            $._initialized = type(uint64).max;
            emit Initialized(type(uint64).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint64) {
        return _getInitializableStorage()._initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _getInitializableStorage()._initializing;
    }

    /**
     * @dev Returns a pointer to the storage namespace.
     */
    // solhint-disable-next-line var-name-mixedcase
    function _getInitializableStorage() private pure returns (InitializableStorage storage $) {
        assembly {
            $.slot := INITIALIZABLE_STORAGE
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (proxy/utils/UUPSUpgradeable.sol)

pragma solidity ^0.8.20;

import {IERC1822Proxiable} from "@openzeppelin/contracts/interfaces/draft-IERC1822.sol";
import {ERC1967Utils} from "@openzeppelin/contracts/proxy/ERC1967/ERC1967Utils.sol";
import {Initializable} from "./Initializable.sol";

/**
 * @dev An upgradeability mechanism designed for UUPS proxies. The functions included here can perform an upgrade of an
 * {ERC1967Proxy}, when this contract is set as the implementation behind such a proxy.
 *
 * A security mechanism ensures that an upgrade does not turn off upgradeability accidentally, although this risk is
 * reinstated if the upgrade retains upgradeability but removes the security mechanism, e.g. by replacing
 * `UUPSUpgradeable` with a custom implementation of upgrades.
 *
 * The {_authorizeUpgrade} function must be overridden to include access restriction to the upgrade mechanism.
 */
abstract contract UUPSUpgradeable is Initializable, IERC1822Proxiable {
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    address private immutable __self = address(this);

    /**
     * @dev The version of the upgrade interface of the contract. If this getter is missing, both `upgradeTo(address)`
     * and `upgradeToAndCall(address,bytes)` are present, and `upgradeTo` must be used if no function should be called,
     * while `upgradeToAndCall` will invoke the `receive` function if the second argument is the empty byte string.
     * If the getter returns `"5.0.0"`, only `upgradeToAndCall(address,bytes)` is present, and the second argument must
     * be the empty byte string if no function should be called, making it impossible to invoke the `receive` function
     * during an upgrade.
     */
    string public constant UPGRADE_INTERFACE_VERSION = "5.0.0";

    /**
     * @dev The call is from an unauthorized context.
     */
    error UUPSUnauthorizedCallContext();

    /**
     * @dev The storage `slot` is unsupported as a UUID.
     */
    error UUPSUnsupportedProxiableUUID(bytes32 slot);

    /**
     * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
     * a proxy contract with an implementation (as defined in ERC-1967) pointing to self. This should only be the case
     * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
     * function through ERC-1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
     * fail.
     */
    modifier onlyProxy() {
        _checkProxy();
        _;
    }

    /**
     * @dev Check that the execution is not being performed through a delegate call. This allows a function to be
     * callable on the implementing contract but not through proxies.
     */
    modifier notDelegated() {
        _checkNotDelegated();
        _;
    }

    function __UUPSUpgradeable_init() internal onlyInitializing {
    }

    function __UUPSUpgradeable_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev Implementation of the ERC-1822 {proxiableUUID} function. This returns the storage slot used by the
     * implementation. It is used to validate the implementation's compatibility when performing an upgrade.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy. This is guaranteed by the `notDelegated` modifier.
     */
    function proxiableUUID() external view virtual notDelegated returns (bytes32) {
        return ERC1967Utils.IMPLEMENTATION_SLOT;
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`, and subsequently execute the function call
     * encoded in `data`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     *
     * @custom:oz-upgrades-unsafe-allow-reachable delegatecall
     */
    function upgradeToAndCall(address newImplementation, bytes memory data) public payable virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, data);
    }

    /**
     * @dev Reverts if the execution is not performed via delegatecall or the execution
     * context is not of a proxy with an ERC-1967 compliant implementation pointing to self.
     * See {_onlyProxy}.
     */
    function _checkProxy() internal view virtual {
        if (
            address(this) == __self || // Must be called through delegatecall
            ERC1967Utils.getImplementation() != __self // Must be called through an active proxy
        ) {
            revert UUPSUnauthorizedCallContext();
        }
    }

    /**
     * @dev Reverts if the execution is performed via delegatecall.
     * See {notDelegated}.
     */
    function _checkNotDelegated() internal view virtual {
        if (address(this) != __self) {
            // Must not be called through delegatecall
            revert UUPSUnauthorizedCallContext();
        }
    }

    /**
     * @dev Function that should revert when `msg.sender` is not authorized to upgrade the contract. Called by
     * {upgradeToAndCall}.
     *
     * Normally, this function will use an xref:access.adoc[access control] modifier such as {Ownable-onlyOwner}.
     *
     * ```solidity
     * function _authorizeUpgrade(address) internal onlyOwner {}
     * ```
     */
    function _authorizeUpgrade(address newImplementation) internal virtual;

    /**
     * @dev Performs an implementation upgrade with a security check for UUPS proxies, and additional setup call.
     *
     * As a security check, {proxiableUUID} is invoked in the new implementation, and the return value
     * is expected to be the implementation slot in ERC-1967.
     *
     * Emits an {IERC1967-Upgraded} event.
     */
    function _upgradeToAndCallUUPS(address newImplementation, bytes memory data) private {
        try IERC1822Proxiable(newImplementation).proxiableUUID() returns (bytes32 slot) {
            if (slot != ERC1967Utils.IMPLEMENTATION_SLOT) {
                revert UUPSUnsupportedProxiableUUID(slot);
            }
            ERC1967Utils.upgradeToAndCall(newImplementation, data);
        } catch {
            // The implementation is not UUPS
            revert ERC1967Utils.ERC1967InvalidImplementation(newImplementation);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;
import {Initializable} from "../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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/ERC165.sol)

pragma solidity ^0.8.20;

import {IERC165} from "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import {Initializable} from "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC-165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 */
abstract contract ERC165Upgradeable is Initializable, IERC165 {
    function __ERC165_init() internal onlyInitializing {
    }

    function __ERC165_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (access/IAccessControl.sol)

pragma solidity ^0.8.20;

/**
 * @dev External interface of AccessControl declared to support ERC-165 detection.
 */
interface IAccessControl {
    /**
     * @dev The `account` is missing a role.
     */
    error AccessControlUnauthorizedAccount(address account, bytes32 neededRole);

    /**
     * @dev The caller of a function is not the expected one.
     *
     * NOTE: Don't confuse with {AccessControlUnauthorizedAccount}.
     */
    error AccessControlBadConfirmation();

    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call. This account bears the admin role (for the granted role).
     * Expected in cases where the role was granted using the internal {AccessControl-_grantRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `callerConfirmation`.
     */
    function renounceRole(bytes32 role, address callerConfirmation) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (interfaces/draft-IERC1822.sol)

pragma solidity ^0.8.20;

/**
 * @dev ERC-1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822Proxiable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC1967.sol)

pragma solidity ^0.8.20;

/**
 * @dev ERC-1967: Proxy Storage Slots. This interface contains the events defined in the ERC.
 */
interface IERC1967 {
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Emitted when the beacon is changed.
     */
    event BeaconUpgraded(address indexed beacon);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (proxy/beacon/IBeacon.sol)

pragma solidity ^0.8.20;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {UpgradeableBeacon} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (proxy/ERC1967/ERC1967Utils.sol)

pragma solidity ^0.8.21;

import {IBeacon} from "../beacon/IBeacon.sol";
import {IERC1967} from "../../interfaces/IERC1967.sol";
import {Address} from "../../utils/Address.sol";
import {StorageSlot} from "../../utils/StorageSlot.sol";

/**
 * @dev This library provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[ERC-1967] slots.
 */
library ERC1967Utils {
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1.
     */
    // solhint-disable-next-line private-vars-leading-underscore
    bytes32 internal constant IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev The `implementation` of the proxy is invalid.
     */
    error ERC1967InvalidImplementation(address implementation);

    /**
     * @dev The `admin` of the proxy is invalid.
     */
    error ERC1967InvalidAdmin(address admin);

    /**
     * @dev The `beacon` of the proxy is invalid.
     */
    error ERC1967InvalidBeacon(address beacon);

    /**
     * @dev An upgrade function sees `msg.value > 0` that may be lost.
     */
    error ERC1967NonPayable();

    /**
     * @dev Returns the current implementation address.
     */
    function getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(IMPLEMENTATION_SLOT).value;
    }

    /**
     * @dev Stores a new address in the ERC-1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        if (newImplementation.code.length == 0) {
            revert ERC1967InvalidImplementation(newImplementation);
        }
        StorageSlot.getAddressSlot(IMPLEMENTATION_SLOT).value = newImplementation;
    }

    /**
     * @dev Performs implementation upgrade with additional setup call if data is nonempty.
     * This function is payable only if the setup call is performed, otherwise `msg.value` is rejected
     * to avoid stuck value in the contract.
     *
     * Emits an {IERC1967-Upgraded} event.
     */
    function upgradeToAndCall(address newImplementation, bytes memory data) internal {
        _setImplementation(newImplementation);
        emit IERC1967.Upgraded(newImplementation);

        if (data.length > 0) {
            Address.functionDelegateCall(newImplementation, data);
        } else {
            _checkNonPayable();
        }
    }

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1.
     */
    // solhint-disable-next-line private-vars-leading-underscore
    bytes32 internal constant ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Returns the current admin.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by ERC-1967) using
     * the https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(ADMIN_SLOT).value;
    }

    /**
     * @dev Stores a new address in the ERC-1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        if (newAdmin == address(0)) {
            revert ERC1967InvalidAdmin(address(0));
        }
        StorageSlot.getAddressSlot(ADMIN_SLOT).value = newAdmin;
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {IERC1967-AdminChanged} event.
     */
    function changeAdmin(address newAdmin) internal {
        emit IERC1967.AdminChanged(getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is the keccak-256 hash of "eip1967.proxy.beacon" subtracted by 1.
     */
    // solhint-disable-next-line private-vars-leading-underscore
    bytes32 internal constant BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

    /**
     * @dev Returns the current beacon.
     */
    function getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(BEACON_SLOT).value;
    }

    /**
     * @dev Stores a new beacon in the ERC-1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        if (newBeacon.code.length == 0) {
            revert ERC1967InvalidBeacon(newBeacon);
        }

        StorageSlot.getAddressSlot(BEACON_SLOT).value = newBeacon;

        address beaconImplementation = IBeacon(newBeacon).implementation();
        if (beaconImplementation.code.length == 0) {
            revert ERC1967InvalidImplementation(beaconImplementation);
        }
    }

    /**
     * @dev Change the beacon and trigger a setup call if data is nonempty.
     * This function is payable only if the setup call is performed, otherwise `msg.value` is rejected
     * to avoid stuck value in the contract.
     *
     * Emits an {IERC1967-BeaconUpgraded} event.
     *
     * CAUTION: Invoking this function has no effect on an instance of {BeaconProxy} since v5, since
     * it uses an immutable beacon without looking at the value of the ERC-1967 beacon slot for
     * efficiency.
     */
    function upgradeBeaconToAndCall(address newBeacon, bytes memory data) internal {
        _setBeacon(newBeacon);
        emit IERC1967.BeaconUpgraded(newBeacon);

        if (data.length > 0) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        } else {
            _checkNonPayable();
        }
    }

    /**
     * @dev Reverts if `msg.value` is not zero. It can be used to avoid `msg.value` stuck in the contract
     * if an upgrade doesn't perform an initialization call.
     */
    function _checkNonPayable() private {
        if (msg.value > 0) {
            revert ERC1967NonPayable();
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/Address.sol)

pragma solidity ^0.8.20;

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

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @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://consensys.net/diligence/blog/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/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert Errors.InsufficientBalance(address(this).balance, amount);
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert Errors.FailedCall();
        }
    }

    /**
     * @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 or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {Errors.FailedCall} error.
     *
     * 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.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @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`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert Errors.InsufficientBalance(address(this).balance, value);
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {Errors.FailedCall}) in case
     * of an unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {Errors.FailedCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

    /**
     * @dev Reverts with returndata if present. Otherwise reverts with {Errors.FailedCall}.
     */
    function _revert(bytes memory returndata) 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
            assembly ("memory-safe") {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert Errors.FailedCall();
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/Errors.sol)

pragma solidity ^0.8.20;

/**
 * @dev Collection of common custom errors used in multiple contracts
 *
 * IMPORTANT: Backwards compatibility is not guaranteed in future versions of the library.
 * It is recommended to avoid relying on the error API for critical functionality.
 *
 * _Available since v5.1._
 */
library Errors {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error InsufficientBalance(uint256 balance, uint256 needed);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedCall();

    /**
     * @dev The deployment failed.
     */
    error FailedDeployment();

    /**
     * @dev A necessary precompile is missing.
     */
    error MissingPrecompile(address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/IERC165.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[ERC section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/StorageSlot.sol)
// This file was procedurally generated from scripts/generate/templates/StorageSlot.js.

pragma solidity ^0.8.20;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC-1967 implementation slot:
 * ```solidity
 * contract ERC1967 {
 *     // Define the slot. Alternatively, use the SlotDerivation library to derive the slot.
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(newImplementation.code.length > 0);
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * TIP: Consider using this library along with {SlotDerivation}.
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    struct Int256Slot {
        int256 value;
    }

    struct StringSlot {
        string value;
    }

    struct BytesSlot {
        bytes value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        assembly ("memory-safe") {
            r.slot := slot
        }
    }

    /**
     * @dev Returns a `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly ("memory-safe") {
            r.slot := slot
        }
    }

    /**
     * @dev Returns a `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly ("memory-safe") {
            r.slot := slot
        }
    }

    /**
     * @dev Returns a `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly ("memory-safe") {
            r.slot := slot
        }
    }

    /**
     * @dev Returns a `Int256Slot` with member `value` located at `slot`.
     */
    function getInt256Slot(bytes32 slot) internal pure returns (Int256Slot storage r) {
        assembly ("memory-safe") {
            r.slot := slot
        }
    }

    /**
     * @dev Returns a `StringSlot` with member `value` located at `slot`.
     */
    function getStringSlot(bytes32 slot) internal pure returns (StringSlot storage r) {
        assembly ("memory-safe") {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `StringSlot` representation of the string storage pointer `store`.
     */
    function getStringSlot(string storage store) internal pure returns (StringSlot storage r) {
        assembly ("memory-safe") {
            r.slot := store.slot
        }
    }

    /**
     * @dev Returns a `BytesSlot` with member `value` located at `slot`.
     */
    function getBytesSlot(bytes32 slot) internal pure returns (BytesSlot storage r) {
        assembly ("memory-safe") {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BytesSlot` representation of the bytes storage pointer `store`.
     */
    function getBytesSlot(bytes storage store) internal pure returns (BytesSlot storage r) {
        assembly ("memory-safe") {
            r.slot := store.slot
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.27;

interface IGasMonetization {
    function addProject(
        uint256 projectId,
        address owner,
        address rewardsRecipient,
        string calldata metadataUri,
        address[] calldata projectContracts
    ) external;

    function addProject(
        address owner,
        address rewardsRecipient,
        string calldata metadataUri,
        address[] calldata projectContracts
    ) external;

    function getProjectIdOfContract(address contractAddress) external view returns (uint256);

    function getProjectOwner(uint256 projectId) external view returns (address);

    function lastProjectId() external view returns (uint256);

    function addProjectContract(uint256 projectId, address contractAddress) external;

    function removeProjectContract(uint256 projectId, address contractAddress) external;

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

    function suspendProject(uint256 projectId) external;

    function getProjectActiveToEpoch(uint256 projectId) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.27;

interface ISfc {
    function currentEpoch() external view returns (uint256);
    function currentSealedEpoch() external view returns (uint256);
    function distributeExtraReward(uint256 epoch, bool withBurn) external payable;
}

{
  "evmVersion": "cancun",
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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