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// SPDX-License-Identifier: AGPL-3.0-only

/*
    Bounty.sol - SKALE Manager
    Copyright (C) 2020-Present SKALE Labs
    @author Dmytro Stebaiev

    SKALE Manager is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    SKALE Manager is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with SKALE Manager.  If not, see <https://www.gnu.org/licenses/>.
*/

pragma solidity 0.8.11;

import "@skalenetwork/skale-manager-interfaces/IBountyV2.sol";
import "@skalenetwork/skale-manager-interfaces/delegation/IDelegationController.sol";
import "@skalenetwork/skale-manager-interfaces/delegation/ITimeHelpers.sol";
import "@skalenetwork/skale-manager-interfaces/INodes.sol";

import "./Permissions.sol";
import "./ConstantsHolder.sol";
import "./delegation/PartialDifferences.sol";


contract BountyV2 is Permissions, IBountyV2 {
    using PartialDifferences for PartialDifferences.Value;
    using PartialDifferences for PartialDifferences.Sequence;

    struct BountyHistory {
        uint month;
        uint bountyPaid;
    }
    
    // TODO: replace with an array when solidity starts supporting it
    uint public constant YEAR1_BOUNTY = 3850e5 * 1e18;
    uint public constant YEAR2_BOUNTY = 3465e5 * 1e18;
    uint public constant YEAR3_BOUNTY = 3080e5 * 1e18;
    uint public constant YEAR4_BOUNTY = 2695e5 * 1e18;
    uint public constant YEAR5_BOUNTY = 2310e5 * 1e18;
    uint public constant YEAR6_BOUNTY = 1925e5 * 1e18;
    uint public constant EPOCHS_PER_YEAR = 12;
    uint public constant SECONDS_PER_DAY = 24 * 60 * 60;
    uint public constant BOUNTY_WINDOW_SECONDS = 3 * SECONDS_PER_DAY;

    bytes32 public constant BOUNTY_REDUCTION_MANAGER_ROLE = keccak256("BOUNTY_REDUCTION_MANAGER_ROLE");
    
    uint private _nextEpoch;
    uint private _epochPool;
    uint private _bountyWasPaidInCurrentEpoch;
    bool public bountyReduction;
    uint public nodeCreationWindowSeconds;

    PartialDifferences.Value private _effectiveDelegatedSum;
    // validatorId   amount of nodes
    mapping (uint => uint) public nodesByValidator; // deprecated

    // validatorId => BountyHistory
    mapping (uint => BountyHistory) private _bountyHistory;

    modifier onlyBountyReductionManager() {
        require(hasRole(BOUNTY_REDUCTION_MANAGER_ROLE, msg.sender), "BOUNTY_REDUCTION_MANAGER_ROLE is required");
        _;
    }

    function calculateBounty(uint nodeIndex)
        external
        override
        allow("SkaleManager")
        returns (uint)
    {
        ConstantsHolder constantsHolder = ConstantsHolder(contractManager.getContract("ConstantsHolder"));
        INodes nodes = INodes(contractManager.getContract("Nodes"));
        ITimeHelpers timeHelpers = ITimeHelpers(contractManager.getContract("TimeHelpers"));
        IDelegationController delegationController = IDelegationController(
            contractManager.getContract("DelegationController")
        );
        
        require(
            _getNextRewardTimestamp(nodeIndex, nodes, timeHelpers) <= block.timestamp,
            "Transaction is sent too early"
        );

        uint validatorId = nodes.getValidatorId(nodeIndex);
        if (nodesByValidator[validatorId] > 0) {
            delete nodesByValidator[validatorId];
        }

        uint currentMonth = timeHelpers.getCurrentMonth();
        _refillEpochPool(currentMonth, timeHelpers, constantsHolder);
        _prepareBountyHistory(validatorId, currentMonth);

        uint bounty = _calculateMaximumBountyAmount(
            _epochPool,
            _effectiveDelegatedSum.getAndUpdateValue(currentMonth),
            _bountyWasPaidInCurrentEpoch,
            nodeIndex,
            _bountyHistory[validatorId].bountyPaid,
            delegationController.getAndUpdateEffectiveDelegatedToValidator(validatorId, currentMonth),
            delegationController.getAndUpdateDelegatedToValidatorNow(validatorId),
            constantsHolder,
            nodes
        );
        _bountyHistory[validatorId].bountyPaid = _bountyHistory[validatorId].bountyPaid + bounty;

        bounty = _reduceBounty(
            bounty,
            nodeIndex,
            nodes,
            constantsHolder
        );
        
        _epochPool = _epochPool - bounty;
        _bountyWasPaidInCurrentEpoch = _bountyWasPaidInCurrentEpoch + bounty;

        return bounty;
    }

    function enableBountyReduction() external override onlyBountyReductionManager {
        bountyReduction = true;
        emit BountyReduction(true);
    }

    function disableBountyReduction() external override onlyBountyReductionManager {
        bountyReduction = false;
        emit BountyReduction(false);
    }

    function setNodeCreationWindowSeconds(uint window) external override allow("Nodes") {
        emit NodeCreationWindowWasChanged(nodeCreationWindowSeconds, window);
        nodeCreationWindowSeconds = window;
    }

    function handleDelegationAdd(
        uint amount,
        uint month
    )
        external
        override
        allow("DelegationController")
    {
        _effectiveDelegatedSum.addToValue(amount, month);
    }

    function handleDelegationRemoving(
        uint amount,
        uint month
    )
        external
        override
        allow("DelegationController")
    {
        _effectiveDelegatedSum.subtractFromValue(amount, month);
    }

    function estimateBounty(uint nodeIndex) external view override returns (uint) {
        ConstantsHolder constantsHolder = ConstantsHolder(contractManager.getContract("ConstantsHolder"));
        INodes nodes = INodes(contractManager.getContract("Nodes"));
        ITimeHelpers timeHelpers = ITimeHelpers(contractManager.getContract("TimeHelpers"));
        IDelegationController delegationController = IDelegationController(
            contractManager.getContract("DelegationController")
        );

        uint currentMonth = timeHelpers.getCurrentMonth();
        uint validatorId = nodes.getValidatorId(nodeIndex);

        uint stagePoolSize;
        (stagePoolSize, ) = _getEpochPool(currentMonth, timeHelpers, constantsHolder);

        return _calculateMaximumBountyAmount(
            stagePoolSize,
            _effectiveDelegatedSum.getValue(currentMonth),
            _nextEpoch == currentMonth + 1 ? _bountyWasPaidInCurrentEpoch : 0,
            nodeIndex,
            _getBountyPaid(validatorId, currentMonth),
            delegationController.getEffectiveDelegatedToValidator(validatorId, currentMonth),
            delegationController.getDelegatedToValidator(validatorId, currentMonth),
            constantsHolder,
            nodes
        );
    }

    function getNextRewardTimestamp(uint nodeIndex) external view override returns (uint) {
        return _getNextRewardTimestamp(
            nodeIndex,
            INodes(contractManager.getContract("Nodes")),
            ITimeHelpers(contractManager.getContract("TimeHelpers"))
        );
    }

    function getEffectiveDelegatedSum() external view override returns (uint[] memory) {
        return _effectiveDelegatedSum.getValues();
    }

    function initialize(address contractManagerAddress) public override initializer {
        Permissions.initialize(contractManagerAddress);
        _nextEpoch = 0;
        _epochPool = 0;
        _bountyWasPaidInCurrentEpoch = 0;
        bountyReduction = false;
        nodeCreationWindowSeconds = 3 * SECONDS_PER_DAY;
    }

    // private

    function _refillEpochPool(uint currentMonth, ITimeHelpers timeHelpers, ConstantsHolder constantsHolder) private {
        uint epochPool;
        uint nextEpoch;
        (epochPool, nextEpoch) = _getEpochPool(currentMonth, timeHelpers, constantsHolder);
        if (_nextEpoch < nextEpoch) {
            (_epochPool, _nextEpoch) = (epochPool, nextEpoch);
            _bountyWasPaidInCurrentEpoch = 0;
        }
    }

    function _reduceBounty(
        uint bounty,
        uint nodeIndex,
        INodes nodes,
        ConstantsHolder constants
    )
        private
        returns (uint reducedBounty)
    {
        if (!bountyReduction) {
            return bounty;
        }

        reducedBounty = bounty;

        if (!nodes.checkPossibilityToMaintainNode(nodes.getValidatorId(nodeIndex), nodeIndex)) {
            reducedBounty = reducedBounty / constants.MSR_REDUCING_COEFFICIENT();
        }
    }

    function _prepareBountyHistory(uint validatorId, uint currentMonth) private {
        if (_bountyHistory[validatorId].month < currentMonth) {
            _bountyHistory[validatorId].month = currentMonth;
            delete _bountyHistory[validatorId].bountyPaid;
        }
    }

    function _calculateMaximumBountyAmount(
        uint epochPoolSize,
        uint effectiveDelegatedSum,
        uint bountyWasPaidInCurrentEpoch,
        uint nodeIndex,
        uint bountyPaidToTheValidator,
        uint effectiveDelegated,
        uint delegated,
        ConstantsHolder constantsHolder,
        INodes nodes
    )
        private
        view
        returns (uint)
    {
        if (nodes.isNodeLeft(nodeIndex)) {
            return 0;
        }

        if (block.timestamp < constantsHolder.launchTimestamp()) {
            // network is not launched
            // bounty is turned off
            return 0;
        }
        
        if (effectiveDelegatedSum == 0) {
            // no delegations in the system
            return 0;
        }

        if (constantsHolder.msr() == 0) {
            return 0;
        }

        uint bounty = _calculateBountyShare(
            epochPoolSize + bountyWasPaidInCurrentEpoch,
            effectiveDelegated,
            effectiveDelegatedSum,
            delegated / constantsHolder.msr(),
            bountyPaidToTheValidator
        );

        return bounty;
    }

    function _getFirstEpoch(ITimeHelpers timeHelpers, ConstantsHolder constantsHolder) private view returns (uint) {
        return timeHelpers.timestampToMonth(constantsHolder.launchTimestamp());
    }

    function _getEpochPool(
        uint currentMonth,
        ITimeHelpers timeHelpers,
        ConstantsHolder constantsHolder
    )
        private
        view
        returns (uint epochPool, uint nextEpoch)
    {
        epochPool = _epochPool;
        for (nextEpoch = _nextEpoch; nextEpoch <= currentMonth; ++nextEpoch) {
            epochPool = epochPool + _getEpochReward(nextEpoch, timeHelpers, constantsHolder);
        }
    }

    function _getEpochReward(
        uint epoch,
        ITimeHelpers timeHelpers,
        ConstantsHolder constantsHolder
    )
        private
        view
        returns (uint)
    {
        uint firstEpoch = _getFirstEpoch(timeHelpers, constantsHolder);
        if (epoch < firstEpoch) {
            return 0;
        }
        uint epochIndex = epoch - firstEpoch;
        uint year = epochIndex / EPOCHS_PER_YEAR;
        if (year >= 6) {
            uint power = (year - 6) / 3 + 1;
            if (power < 256) {
                return YEAR6_BOUNTY / 2 ** power / EPOCHS_PER_YEAR;
            } else {
                return 0;
            }
        } else {
            uint[6] memory customBounties = [
                YEAR1_BOUNTY,
                YEAR2_BOUNTY,
                YEAR3_BOUNTY,
                YEAR4_BOUNTY,
                YEAR5_BOUNTY,
                YEAR6_BOUNTY
            ];
            return customBounties[year] / EPOCHS_PER_YEAR;
        }
    }

    function _getBountyPaid(uint validatorId, uint month) private view returns (uint) {
        require(_bountyHistory[validatorId].month <= month, "Can't get bounty paid");
        if (_bountyHistory[validatorId].month == month) {
            return _bountyHistory[validatorId].bountyPaid;
        } else {
            return 0;
        }
    }

    function _getNextRewardTimestamp(uint nodeIndex, INodes nodes, ITimeHelpers timeHelpers)
        private
        view
        returns (uint)
    {
        uint lastRewardTimestamp = nodes.getNodeLastRewardDate(nodeIndex);
        uint lastRewardMonth = timeHelpers.timestampToMonth(lastRewardTimestamp);
        uint lastRewardMonthStart = timeHelpers.monthToTimestamp(lastRewardMonth);
        uint timePassedAfterMonthStart = lastRewardTimestamp - lastRewardMonthStart;
        uint currentMonth = timeHelpers.getCurrentMonth();
        assert(lastRewardMonth <= currentMonth);

        if (lastRewardMonth == currentMonth) {
            uint nextMonthStart = timeHelpers.monthToTimestamp(currentMonth + 1);
            uint nextMonthFinish = timeHelpers.monthToTimestamp(lastRewardMonth + 2);
            if (lastRewardTimestamp < lastRewardMonthStart + nodeCreationWindowSeconds) {
                return nextMonthStart - BOUNTY_WINDOW_SECONDS;
            } else {
                return _min(nextMonthStart + timePassedAfterMonthStart, nextMonthFinish - BOUNTY_WINDOW_SECONDS);
            }
        } else if (lastRewardMonth + 1 == currentMonth) {
            uint currentMonthStart = timeHelpers.monthToTimestamp(currentMonth);
            uint currentMonthFinish = timeHelpers.monthToTimestamp(currentMonth + 1);
            return _min(
                currentMonthStart + _max(timePassedAfterMonthStart, nodeCreationWindowSeconds),
                currentMonthFinish - BOUNTY_WINDOW_SECONDS
            );
        } else {
            uint currentMonthStart = timeHelpers.monthToTimestamp(currentMonth);
            return currentMonthStart + nodeCreationWindowSeconds;
        }
    }

    function _calculateBountyShare(
        uint monthBounty,
        uint effectiveDelegated,
        uint effectiveDelegatedSum,
        uint maxNodesAmount,
        uint paidToValidator
    )
        private
        pure
        returns (uint)
    {
        if (maxNodesAmount > 0) {
            uint totalBountyShare = monthBounty * effectiveDelegated / effectiveDelegatedSum;
            return _min(
                totalBountyShare / maxNodesAmount,
                totalBountyShare - paidToValidator
            );
        } else {
            return 0;
        }
    }

    function _min(uint a, uint b) private pure returns (uint) {
        if (a < b) {
            return a;
        } else {
            return b;
        }
    }

    function _max(uint a, uint b) private pure returns (uint) {
        if (a < b) {
            return b;
        } else {
            return a;
        }
    }

}

// SPDX-License-Identifier: AGPL-3.0-only

/*
    IBountyV2.sol - SKALE Manager Interfaces
    Copyright (C) 2021-Present SKALE Labs
    @author Artem Payvin

    SKALE Manager Interfaces is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    SKALE Manager Interfaces is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with SKALE Manager Interfaces.  If not, see <https://www.gnu.org/licenses/>.
*/

pragma solidity >=0.6.10 <0.9.0;

interface IBountyV2 {

    /**
     * @dev Emitted when bounty reduction is turned on or turned off.
     */
    event BountyReduction(bool status);
    /**
     * @dev Emitted when a node creation window was changed.
     */
    event NodeCreationWindowWasChanged(
        uint oldValue,
        uint newValue
    );

    function calculateBounty(uint nodeIndex) external returns (uint);
    function enableBountyReduction() external;
    function disableBountyReduction() external;
    function setNodeCreationWindowSeconds(uint window) external;
    function handleDelegationAdd(uint amount, uint month) external;
    function handleDelegationRemoving(uint amount, uint month) external;
    function estimateBounty(uint nodeIndex) external view returns (uint);
    function getNextRewardTimestamp(uint nodeIndex) external view returns (uint);
    function getEffectiveDelegatedSum() external view returns (uint[] memory);
}

// SPDX-License-Identifier: AGPL-3.0-only

/*
    IDelegationController.sol - SKALE Manager
    Copyright (C) 2018-Present SKALE Labs
    @author Artem Payvin

    SKALE Manager is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    SKALE Manager is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with SKALE Manager.  If not, see <https://www.gnu.org/licenses/>.
*/

pragma solidity >=0.6.10 <0.9.0;

interface IDelegationController {
    enum State {
        PROPOSED,
        ACCEPTED,
        CANCELED,
        REJECTED,
        DELEGATED,
        UNDELEGATION_REQUESTED,
        COMPLETED
    }

    struct Delegation {
        address holder; // address of token owner
        uint validatorId;
        uint amount;
        uint delegationPeriod;
        uint created; // time of delegation creation
        uint started; // month when a delegation becomes active
        uint finished; // first month after a delegation ends
        string info;
    }

    /**
     * @dev Emitted when validator was confiscated.
     */
    event Confiscated(
        uint indexed validatorId,
        uint amount
    );

    /**
     * @dev Emitted when validator was confiscated.
     */
    event SlashesProcessed(
        address indexed holder,
        uint limit
    );

    /**
     * @dev Emitted when a delegation is proposed to a validator.
     */
    event DelegationProposed(
        uint delegationId
    );

    /**
     * @dev Emitted when a delegation is accepted by a validator.
     */
    event DelegationAccepted(
        uint delegationId
    );

    /**
     * @dev Emitted when a delegation is cancelled by the delegator.
     */
    event DelegationRequestCanceledByUser(
        uint delegationId
    );

    /**
     * @dev Emitted when a delegation is requested to undelegate.
     */
    event UndelegationRequested(
        uint delegationId
    );
    
    function getAndUpdateDelegatedToValidatorNow(uint validatorId) external returns (uint);
    function getAndUpdateDelegatedAmount(address holder) external returns (uint);
    function getAndUpdateEffectiveDelegatedByHolderToValidator(address holder, uint validatorId, uint month)
        external
        returns (uint effectiveDelegated);
    function delegate(
        uint validatorId,
        uint amount,
        uint delegationPeriod,
        string calldata info
    )
        external;
    function cancelPendingDelegation(uint delegationId) external;
    function acceptPendingDelegation(uint delegationId) external;
    function requestUndelegation(uint delegationId) external;
    function confiscate(uint validatorId, uint amount) external;
    function getAndUpdateEffectiveDelegatedToValidator(uint validatorId, uint month) external returns (uint);
    function getAndUpdateDelegatedByHolderToValidatorNow(address holder, uint validatorId) external returns (uint);
    function processSlashes(address holder, uint limit) external;
    function processAllSlashes(address holder) external;
    function getEffectiveDelegatedValuesByValidator(uint validatorId) external view returns (uint[] memory);
    function getEffectiveDelegatedToValidator(uint validatorId, uint month) external view returns (uint);
    function getDelegatedToValidator(uint validatorId, uint month) external view returns (uint);
    function getDelegation(uint delegationId) external view returns (Delegation memory);
    function getFirstDelegationMonth(address holder, uint validatorId) external view returns(uint);
    function getDelegationsByValidatorLength(uint validatorId) external view returns (uint);
    function getDelegationsByHolderLength(address holder) external view returns (uint);
    function getState(uint delegationId) external view returns (State state);
    function getLockedInPendingDelegations(address holder) external view returns (uint);
    function hasUnprocessedSlashes(address holder) external view returns (bool);
}

// SPDX-License-Identifier: AGPL-3.0-only

/*
    ITimeHelpers.sol - SKALE Manager
    Copyright (C) 2018-Present SKALE Labs
    @author Artem Payvin

    SKALE Manager is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    SKALE Manager is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with SKALE Manager.  If not, see <https://www.gnu.org/licenses/>.
*/

pragma solidity >=0.6.10 <0.9.0;

interface ITimeHelpers {
    function calculateProofOfUseLockEndTime(uint month, uint lockUpPeriodDays) external view returns (uint timestamp);
    function getCurrentMonth() external view returns (uint);
    function timestampToYear(uint timestamp) external view returns (uint);
    function timestampToMonth(uint timestamp) external view returns (uint);
    function monthToTimestamp(uint month) external view returns (uint timestamp);
    function addDays(uint fromTimestamp, uint n) external pure returns (uint);
    function addMonths(uint fromTimestamp, uint n) external pure returns (uint);
    function addYears(uint fromTimestamp, uint n) external pure returns (uint);
}

// SPDX-License-Identifier: AGPL-3.0-only

/*
    INodes.sol - SKALE Manager
    Copyright (C) 2018-Present SKALE Labs
    @author Artem Payvin

    SKALE Manager is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    SKALE Manager is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with SKALE Manager.  If not, see <https://www.gnu.org/licenses/>.
*/

pragma solidity >=0.6.10 <0.9.0;

import "./utils/IRandom.sol";

interface INodes {
    // All Nodes states
    enum NodeStatus {Active, Leaving, Left, In_Maintenance}

    struct Node {
        string name;
        bytes4 ip;
        bytes4 publicIP;
        uint16 port;
        bytes32[2] publicKey;
        uint startBlock;
        uint lastRewardDate;
        uint finishTime;
        NodeStatus status;
        uint validatorId;
    }

    // struct to note which Nodes and which number of Nodes owned by user
    struct CreatedNodes {
        mapping (uint => bool) isNodeExist;
        uint numberOfNodes;
    }

    struct SpaceManaging {
        uint8 freeSpace;
        uint indexInSpaceMap;
    }

    struct NodeCreationParams {
        string name;
        bytes4 ip;
        bytes4 publicIp;
        uint16 port;
        bytes32[2] publicKey;
        uint16 nonce;
        string domainName;
    }
    
    /**
     * @dev Emitted when a node is created.
     */
    event NodeCreated(
        uint nodeIndex,
        address owner,
        string name,
        bytes4 ip,
        bytes4 publicIP,
        uint16 port,
        uint16 nonce,
        string domainName
    );

    /**
     * @dev Emitted when a node completes a network exit.
     */
    event ExitCompleted(
        uint nodeIndex
    );

    /**
     * @dev Emitted when a node begins to exit from the network.
     */
    event ExitInitialized(
        uint nodeIndex,
        uint startLeavingPeriod
    );

    /**
     * @dev Emitted when a node set to in compliant or compliant.
     */
    event IncompliantNode(
        uint indexed nodeIndex,
        bool status
    );

    /**
     * @dev Emitted when a node set to in maintenance or from in maintenance.
     */
    event MaintenanceNode(
        uint indexed nodeIndex,
        bool status
    );

    /**
     * @dev Emitted when a node status changed.
     */
    event IPChanged(
        uint indexed nodeIndex,
        bytes4 previousIP,
        bytes4 newIP
    );
    
    function removeSpaceFromNode(uint nodeIndex, uint8 space) external returns (bool);
    function addSpaceToNode(uint nodeIndex, uint8 space) external;
    function changeNodeLastRewardDate(uint nodeIndex) external;
    function changeNodeFinishTime(uint nodeIndex, uint time) external;
    function createNode(address from, NodeCreationParams calldata params) external;
    function initExit(uint nodeIndex) external;
    function completeExit(uint nodeIndex) external returns (bool);
    function deleteNodeForValidator(uint validatorId, uint nodeIndex) external;
    function checkPossibilityCreatingNode(address nodeAddress) external;
    function checkPossibilityToMaintainNode(uint validatorId, uint nodeIndex) external returns (bool);
    function setNodeInMaintenance(uint nodeIndex) external;
    function removeNodeFromInMaintenance(uint nodeIndex) external;
    function setNodeIncompliant(uint nodeIndex) external;
    function setNodeCompliant(uint nodeIndex) external;
    function setDomainName(uint nodeIndex, string memory domainName) external;
    function makeNodeVisible(uint nodeIndex) external;
    function makeNodeInvisible(uint nodeIndex) external;
    function changeIP(uint nodeIndex, bytes4 newIP, bytes4 newPublicIP) external;
    function numberOfActiveNodes() external view returns (uint);
    function incompliant(uint nodeIndex) external view returns (bool);
    function getRandomNodeWithFreeSpace(
        uint8 freeSpace,
        IRandom.RandomGenerator memory randomGenerator
    )
        external
        view
        returns (uint);
    function isTimeForReward(uint nodeIndex) external view returns (bool);
    function getNodeIP(uint nodeIndex) external view returns (bytes4);
    function getNodeDomainName(uint nodeIndex) external view returns (string memory);
    function getNodePort(uint nodeIndex) external view returns (uint16);
    function getNodePublicKey(uint nodeIndex) external view returns (bytes32[2] memory);
    function getNodeAddress(uint nodeIndex) external view returns (address);
    function getNodeFinishTime(uint nodeIndex) external view returns (uint);
    function isNodeLeft(uint nodeIndex) external view returns (bool);
    function isNodeInMaintenance(uint nodeIndex) external view returns (bool);
    function getNodeLastRewardDate(uint nodeIndex) external view returns (uint);
    function getNodeNextRewardDate(uint nodeIndex) external view returns (uint);
    function getNumberOfNodes() external view returns (uint);
    function getNumberOnlineNodes() external view returns (uint);
    function getActiveNodeIds() external view returns (uint[] memory activeNodeIds);
    function getNodeStatus(uint nodeIndex) external view returns (NodeStatus);
    function getValidatorNodeIndexes(uint validatorId) external view returns (uint[] memory);
    function countNodesWithFreeSpace(uint8 freeSpace) external view returns (uint count);
    function getValidatorId(uint nodeIndex) external view returns (uint);
    function isNodeExist(address from, uint nodeIndex) external view returns (bool);
    function isNodeActive(uint nodeIndex) external view returns (bool);
    function isNodeLeaving(uint nodeIndex) external view returns (bool);
}

// SPDX-License-Identifier: AGPL-3.0-only

/*
    Permissions.sol - SKALE Manager
    Copyright (C) 2018-Present SKALE Labs
    @author Artem Payvin

    SKALE Manager is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    SKALE Manager is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with SKALE Manager.  If not, see <https://www.gnu.org/licenses/>.
*/

pragma solidity 0.8.11;

import "@skalenetwork/skale-manager-interfaces/IContractManager.sol";
import "@skalenetwork/skale-manager-interfaces/IPermissions.sol";

import "./thirdparty/openzeppelin/AccessControlUpgradeableLegacy.sol";


/**
 * @title Permissions
 * @dev Contract is connected module for Upgradeable approach, knows ContractManager
 */
contract Permissions is AccessControlUpgradeableLegacy, IPermissions {
    using AddressUpgradeable for address;
    
    IContractManager public contractManager;

    /**
     * @dev Modifier to make a function callable only when caller is the Owner.
     * 
     * Requirements:
     * 
     * - The caller must be the owner.
     */
    modifier onlyOwner() {
        require(_isOwner(), "Caller is not the owner");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when caller is an Admin.
     * 
     * Requirements:
     * 
     * - The caller must be an admin.
     */
    modifier onlyAdmin() {
        require(_isAdmin(msg.sender), "Caller is not an admin");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when caller is the Owner 
     * or `contractName` contract.
     * 
     * Requirements:
     * 
     * - The caller must be the owner or `contractName`.
     */
    modifier allow(string memory contractName) {
        require(
            contractManager.getContract(contractName) == msg.sender || _isOwner(),
            "Message sender is invalid");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when caller is the Owner 
     * or `contractName1` or `contractName2` contract.
     * 
     * Requirements:
     * 
     * - The caller must be the owner, `contractName1`, or `contractName2`.
     */
    modifier allowTwo(string memory contractName1, string memory contractName2) {
        require(
            contractManager.getContract(contractName1) == msg.sender ||
            contractManager.getContract(contractName2) == msg.sender ||
            _isOwner(),
            "Message sender is invalid");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when caller is the Owner 
     * or `contractName1`, `contractName2`, or `contractName3` contract.
     * 
     * Requirements:
     * 
     * - The caller must be the owner, `contractName1`, `contractName2`, or 
     * `contractName3`.
     */
    modifier allowThree(string memory contractName1, string memory contractName2, string memory contractName3) {
        require(
            contractManager.getContract(contractName1) == msg.sender ||
            contractManager.getContract(contractName2) == msg.sender ||
            contractManager.getContract(contractName3) == msg.sender ||
            _isOwner(),
            "Message sender is invalid");
        _;
    }

    function initialize(address contractManagerAddress) public virtual override initializer {
        AccessControlUpgradeableLegacy.__AccessControl_init();
        _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _setContractManager(contractManagerAddress);
    }

    function _isOwner() internal view returns (bool) {
        return hasRole(DEFAULT_ADMIN_ROLE, msg.sender);
    }

    function _isAdmin(address account) internal view returns (bool) {
        address skaleManagerAddress = contractManager.contracts(keccak256(abi.encodePacked("SkaleManager")));
        if (skaleManagerAddress != address(0)) {
            AccessControlUpgradeableLegacy skaleManager = AccessControlUpgradeableLegacy(skaleManagerAddress);
            return skaleManager.hasRole(keccak256("ADMIN_ROLE"), account) || _isOwner();
        } else {
            return _isOwner();
        }
    }

    function _setContractManager(address contractManagerAddress) private {
        require(contractManagerAddress != address(0), "ContractManager address is not set");
        require(contractManagerAddress.isContract(), "Address is not contract");
        contractManager = IContractManager(contractManagerAddress);
    }
}

// SPDX-License-Identifier: AGPL-3.0-only

/*
    ConstantsHolder.sol - SKALE Manager
    Copyright (C) 2018-Present SKALE Labs
    @author Artem Payvin

    SKALE Manager is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    SKALE Manager is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with SKALE Manager.  If not, see <https://www.gnu.org/licenses/>.
*/

pragma solidity 0.8.11;

import "@skalenetwork/skale-manager-interfaces/IConstantsHolder.sol";

import "./Permissions.sol";


/**
 * @title ConstantsHolder
 * @dev Contract contains constants and common variables for the SKALE Network.
 */
contract ConstantsHolder is Permissions, IConstantsHolder {

    // initial price for creating Node (100 SKL)
    uint public constant NODE_DEPOSIT = 100 * 1e18;

    uint8 public constant TOTAL_SPACE_ON_NODE = 128;

    // part of Node for Small Skale-chain (1/128 of Node)
    uint8 public constant SMALL_DIVISOR = 128;

    // part of Node for Medium Skale-chain (1/32 of Node)
    uint8 public constant MEDIUM_DIVISOR = 32;

    // part of Node for Large Skale-chain (full Node)
    uint8 public constant LARGE_DIVISOR = 1;

    // part of Node for Medium Test Skale-chain (1/4 of Node)
    uint8 public constant MEDIUM_TEST_DIVISOR = 4;

    // typically number of Nodes for Skale-chain (16 Nodes)
    uint public constant NUMBER_OF_NODES_FOR_SCHAIN = 16;

    // number of Nodes for Test Skale-chain (2 Nodes)
    uint public constant NUMBER_OF_NODES_FOR_TEST_SCHAIN = 2;

    // number of Nodes for Test Skale-chain (4 Nodes)
    uint public constant NUMBER_OF_NODES_FOR_MEDIUM_TEST_SCHAIN = 4;    

    // number of seconds in one year
    uint32 public constant SECONDS_TO_YEAR = 31622400;

    // initial number of monitors
    uint public constant NUMBER_OF_MONITORS = 24;

    uint public constant OPTIMAL_LOAD_PERCENTAGE = 80;

    uint public constant ADJUSTMENT_SPEED = 1000;

    uint public constant COOLDOWN_TIME = 60;

    uint public constant MIN_PRICE = 10**6;

    uint public constant MSR_REDUCING_COEFFICIENT = 2;

    uint public constant DOWNTIME_THRESHOLD_PART = 30;

    uint public constant BOUNTY_LOCKUP_MONTHS = 2;

    uint public constant ALRIGHT_DELTA = 134161;
    uint public constant BROADCAST_DELTA = 177490;
    uint public constant COMPLAINT_BAD_DATA_DELTA = 80995;
    uint public constant PRE_RESPONSE_DELTA = 100061;
    uint public constant COMPLAINT_DELTA = 104611;
    uint public constant RESPONSE_DELTA = 49132;

    // MSR - Minimum staking requirement
    uint public msr;

    // Reward period - 30 days (each 30 days Node would be granted for bounty)
    uint32 public rewardPeriod;

    // Allowable latency - 150000 ms by default
    uint32 public allowableLatency;

    /**
     * Delta period - 1 hour (1 hour before Reward period became Monitors need
     * to send Verdicts and 1 hour after Reward period became Node need to come
     * and get Bounty)
     */
    uint32 public deltaPeriod;

    /**
     * Check time - 2 minutes (every 2 minutes monitors should check metrics
     * from checked nodes)
     */
    uint public checkTime;

    //Need to add minimal allowed parameters for verdicts

    uint public launchTimestamp;

    uint public rotationDelay;

    uint public proofOfUseLockUpPeriodDays;

    uint public proofOfUseDelegationPercentage;

    uint public limitValidatorsPerDelegator;

    uint256 public firstDelegationsMonth; // deprecated

    // date when schains will be allowed for creation
    uint public schainCreationTimeStamp;

    uint public minimalSchainLifetime;

    uint public complaintTimeLimit;

    bytes32 public constant CONSTANTS_HOLDER_MANAGER_ROLE = keccak256("CONSTANTS_HOLDER_MANAGER_ROLE");

    modifier onlyConstantsHolderManager() {
        require(hasRole(CONSTANTS_HOLDER_MANAGER_ROLE, msg.sender), "CONSTANTS_HOLDER_MANAGER_ROLE is required");
        _;
    }

    /**
     * @dev Allows the Owner to set new reward and delta periods
     * This function is only for tests.
     */
    function setPeriods(uint32 newRewardPeriod, uint32 newDeltaPeriod) external override onlyConstantsHolderManager {
        require(
            newRewardPeriod >= newDeltaPeriod && newRewardPeriod - newDeltaPeriod >= checkTime,
            "Incorrect Periods"
        );
        emit ConstantUpdated(
            keccak256(abi.encodePacked("RewardPeriod")),
            uint(rewardPeriod),
            uint(newRewardPeriod)
        );
        rewardPeriod = newRewardPeriod;
        emit ConstantUpdated(
            keccak256(abi.encodePacked("DeltaPeriod")),
            uint(deltaPeriod),
            uint(newDeltaPeriod)
        );
        deltaPeriod = newDeltaPeriod;
    }

    /**
     * @dev Allows the Owner to set the new check time.
     * This function is only for tests.
     */
    function setCheckTime(uint newCheckTime) external override onlyConstantsHolderManager {
        require(rewardPeriod - deltaPeriod >= checkTime, "Incorrect check time");
        emit ConstantUpdated(
            keccak256(abi.encodePacked("CheckTime")),
            uint(checkTime),
            uint(newCheckTime)
        );
        checkTime = newCheckTime;
    }    

    /**
     * @dev Allows the Owner to set the allowable latency in milliseconds.
     * This function is only for testing purposes.
     */
    function setLatency(uint32 newAllowableLatency) external override onlyConstantsHolderManager {
        emit ConstantUpdated(
            keccak256(abi.encodePacked("AllowableLatency")),
            uint(allowableLatency),
            uint(newAllowableLatency)
        );
        allowableLatency = newAllowableLatency;
    }

    /**
     * @dev Allows the Owner to set the minimum stake requirement.
     */
    function setMSR(uint newMSR) external override onlyConstantsHolderManager {
        emit ConstantUpdated(
            keccak256(abi.encodePacked("MSR")),
            uint(msr),
            uint(newMSR)
        );
        msr = newMSR;
    }

    /**
     * @dev Allows the Owner to set the launch timestamp.
     */
    function setLaunchTimestamp(uint timestamp) external override onlyConstantsHolderManager {
        require(
            block.timestamp < launchTimestamp,
            "Cannot set network launch timestamp because network is already launched"
        );
        emit ConstantUpdated(
            keccak256(abi.encodePacked("LaunchTimestamp")),
            uint(launchTimestamp),
            uint(timestamp)
        );
        launchTimestamp = timestamp;
    }

    /**
     * @dev Allows the Owner to set the node rotation delay.
     */
    function setRotationDelay(uint newDelay) external override onlyConstantsHolderManager {
        emit ConstantUpdated(
            keccak256(abi.encodePacked("RotationDelay")),
            uint(rotationDelay),
            uint(newDelay)
        );
        rotationDelay = newDelay;
    }

    /**
     * @dev Allows the Owner to set the proof-of-use lockup period.
     */
    function setProofOfUseLockUpPeriod(uint periodDays) external override onlyConstantsHolderManager {
        emit ConstantUpdated(
            keccak256(abi.encodePacked("ProofOfUseLockUpPeriodDays")),
            uint(proofOfUseLockUpPeriodDays),
            uint(periodDays)
        );
        proofOfUseLockUpPeriodDays = periodDays;
    }

    /**
     * @dev Allows the Owner to set the proof-of-use delegation percentage
     * requirement.
     */
    function setProofOfUseDelegationPercentage(uint percentage) external override onlyConstantsHolderManager {
        require(percentage <= 100, "Percentage value is incorrect");
        emit ConstantUpdated(
            keccak256(abi.encodePacked("ProofOfUseDelegationPercentage")),
            uint(proofOfUseDelegationPercentage),
            uint(percentage)
        );
        proofOfUseDelegationPercentage = percentage;
    }

    /**
     * @dev Allows the Owner to set the maximum number of validators that a
     * single delegator can delegate to.
     */
    function setLimitValidatorsPerDelegator(uint newLimit) external override onlyConstantsHolderManager {
        emit ConstantUpdated(
            keccak256(abi.encodePacked("LimitValidatorsPerDelegator")),
            uint(limitValidatorsPerDelegator),
            uint(newLimit)
        );
        limitValidatorsPerDelegator = newLimit;
    }

    function setSchainCreationTimeStamp(uint timestamp) external override onlyConstantsHolderManager {
        emit ConstantUpdated(
            keccak256(abi.encodePacked("SchainCreationTimeStamp")),
            uint(schainCreationTimeStamp),
            uint(timestamp)
        );
        schainCreationTimeStamp = timestamp;
    }

    function setMinimalSchainLifetime(uint lifetime) external override onlyConstantsHolderManager {
        emit ConstantUpdated(
            keccak256(abi.encodePacked("MinimalSchainLifetime")),
            uint(minimalSchainLifetime),
            uint(lifetime)
        );
        minimalSchainLifetime = lifetime;
    }

    function setComplaintTimeLimit(uint timeLimit) external override onlyConstantsHolderManager {
        emit ConstantUpdated(
            keccak256(abi.encodePacked("ComplaintTimeLimit")),
            uint(complaintTimeLimit),
            uint(timeLimit)
        );
        complaintTimeLimit = timeLimit;
    }

    function initialize(address contractsAddress) public override initializer {
        Permissions.initialize(contractsAddress);

        msr = 0;
        rewardPeriod = 2592000;
        allowableLatency = 150000;
        deltaPeriod = 3600;
        checkTime = 300;
        launchTimestamp = type(uint).max;
        rotationDelay = 12 hours;
        proofOfUseLockUpPeriodDays = 90;
        proofOfUseDelegationPercentage = 50;
        limitValidatorsPerDelegator = 20;
        firstDelegationsMonth = 0;
        complaintTimeLimit = 1800;
    }
}

// SPDX-License-Identifier: AGPL-3.0-only

/*
    PartialDifferences.sol - SKALE Manager
    Copyright (C) 2018-Present SKALE Labs
    @author Dmytro Stebaiev

    SKALE Manager is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    SKALE Manager is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with SKALE Manager.  If not, see <https://www.gnu.org/licenses/>.
*/

pragma solidity 0.8.11;

import "../utils/MathUtils.sol";
import "../utils/FractionUtils.sol";

/**
 * @title Partial Differences Library
 * @dev This library contains functions to manage Partial Differences data
 * structure. Partial Differences is an array of value differences over time.
 * 
 * For example: assuming an array [3, 6, 3, 1, 2], partial differences can
 * represent this array as [_, 3, -3, -2, 1].
 * 
 * This data structure allows adding values on an open interval with O(1)
 * complexity.
 * 
 * For example: add +5 to [3, 6, 3, 1, 2] starting from the second element (3),
 * instead of performing [3, 6, 3+5, 1+5, 2+5] partial differences allows
 * performing [_, 3, -3+5, -2, 1]. The original array can be restored by
 * adding values from partial differences.
 */
library PartialDifferences {
    using MathUtils for uint;

    struct Sequence {
             // month => diff
        mapping (uint => uint) addDiff;
             // month => diff
        mapping (uint => uint) subtractDiff;
             // month => value
        mapping (uint => uint) value;

        uint firstUnprocessedMonth;
        uint lastChangedMonth;
    }

    struct Value {
             // month => diff
        mapping (uint => uint) addDiff;
             // month => diff
        mapping (uint => uint) subtractDiff;

        uint value;
        uint firstUnprocessedMonth;
        uint lastChangedMonth;
    }

    // functions for sequence

    function addToSequence(Sequence storage sequence, uint diff, uint month) internal {
        require(sequence.firstUnprocessedMonth <= month, "Cannot add to the past");
        if (sequence.firstUnprocessedMonth == 0) {
            sequence.firstUnprocessedMonth = month;
        }
        sequence.addDiff[month] = sequence.addDiff[month] + diff;
        if (sequence.lastChangedMonth != month) {
            sequence.lastChangedMonth = month;
        }
    }

    function subtractFromSequence(Sequence storage sequence, uint diff, uint month) internal {
        require(sequence.firstUnprocessedMonth <= month, "Cannot subtract from the past");
        if (sequence.firstUnprocessedMonth == 0) {
            sequence.firstUnprocessedMonth = month;
        }
        sequence.subtractDiff[month] = sequence.subtractDiff[month] + diff;
        if (sequence.lastChangedMonth != month) {
            sequence.lastChangedMonth = month;
        }
    }

    function getAndUpdateValueInSequence(Sequence storage sequence, uint month) internal returns (uint) {
        if (sequence.firstUnprocessedMonth == 0) {
            return 0;
        }

        if (sequence.firstUnprocessedMonth <= month) {
            for (uint i = sequence.firstUnprocessedMonth; i <= month; ++i) {
                uint nextValue = (sequence.value[i - 1] + sequence.addDiff[i]).boundedSub(sequence.subtractDiff[i]);
                if (sequence.value[i] != nextValue) {
                    sequence.value[i] = nextValue;
                }
                if (sequence.addDiff[i] > 0) {
                    delete sequence.addDiff[i];
                }
                if (sequence.subtractDiff[i] > 0) {
                    delete sequence.subtractDiff[i];
                }
            }
            sequence.firstUnprocessedMonth = month + 1;
        }

        return sequence.value[month];
    }

    function reduceSequence(
        Sequence storage sequence,
        FractionUtils.Fraction memory reducingCoefficient,
        uint month) internal
    {
        require(month + 1 >= sequence.firstUnprocessedMonth, "Cannot reduce value in the past");
        require(
            reducingCoefficient.numerator <= reducingCoefficient.denominator,
            "Increasing of values is not implemented");
        if (sequence.firstUnprocessedMonth == 0) {
            return;
        }
        uint value = getAndUpdateValueInSequence(sequence, month);
        if (value.approximatelyEqual(0)) {
            return;
        }

        sequence.value[month] = sequence.value[month]
            * reducingCoefficient.numerator
            / reducingCoefficient.denominator;

        for (uint i = month + 1; i <= sequence.lastChangedMonth; ++i) {
            sequence.subtractDiff[i] = sequence.subtractDiff[i]
                * reducingCoefficient.numerator
                / reducingCoefficient.denominator;
        }
    }

    // functions for value

    function addToValue(Value storage sequence, uint diff, uint month) internal {
        require(sequence.firstUnprocessedMonth <= month, "Cannot add to the past");
        if (sequence.firstUnprocessedMonth == 0) {
            sequence.firstUnprocessedMonth = month;
            sequence.lastChangedMonth = month;
        }
        if (month > sequence.lastChangedMonth) {
            sequence.lastChangedMonth = month;
        }

        if (month >= sequence.firstUnprocessedMonth) {
            sequence.addDiff[month] = sequence.addDiff[month] + diff;
        } else {
            sequence.value = sequence.value + diff;
        }
    }

    function subtractFromValue(Value storage sequence, uint diff, uint month) internal {
        require(sequence.firstUnprocessedMonth <= month + 1, "Cannot subtract from the past");
        if (sequence.firstUnprocessedMonth == 0) {
            sequence.firstUnprocessedMonth = month;
            sequence.lastChangedMonth = month;
        }
        if (month > sequence.lastChangedMonth) {
            sequence.lastChangedMonth = month;
        }

        if (month >= sequence.firstUnprocessedMonth) {
            sequence.subtractDiff[month] = sequence.subtractDiff[month] + diff;
        } else {
            sequence.value = sequence.value.boundedSub(diff);
        }
    }

    function getAndUpdateValue(Value storage sequence, uint month) internal returns (uint) {
        require(
            month + 1 >= sequence.firstUnprocessedMonth,
            "Cannot calculate value in the past");
        if (sequence.firstUnprocessedMonth == 0) {
            return 0;
        }

        if (sequence.firstUnprocessedMonth <= month) {
            uint value = sequence.value;
            for (uint i = sequence.firstUnprocessedMonth; i <= month; ++i) {
                value = (value + sequence.addDiff[i]).boundedSub(sequence.subtractDiff[i]);
                if (sequence.addDiff[i] > 0) {
                    delete sequence.addDiff[i];
                }
                if (sequence.subtractDiff[i] > 0) {
                    delete sequence.subtractDiff[i];
                }
            }
            if (sequence.value != value) {
                sequence.value = value;
            }
            sequence.firstUnprocessedMonth = month + 1;
        }

        return sequence.value;
    }

    function reduceValue(
        Value storage sequence,
        uint amount,
        uint month)
        internal returns (FractionUtils.Fraction memory)
    {
        require(month + 1 >= sequence.firstUnprocessedMonth, "Cannot reduce value in the past");
        if (sequence.firstUnprocessedMonth == 0) {
            return FractionUtils.createFraction(0);
        }
        uint value = getAndUpdateValue(sequence, month);
        if (value.approximatelyEqual(0)) {
            return FractionUtils.createFraction(0);
        }

        uint _amount = amount;
        if (value < amount) {
            _amount = value;
        }

        FractionUtils.Fraction memory reducingCoefficient =
            FractionUtils.createFraction(value.boundedSub(_amount), value);
        reduceValueByCoefficient(sequence, reducingCoefficient, month);
        return reducingCoefficient;
    }

    function reduceValueByCoefficient(
        Value storage sequence,
        FractionUtils.Fraction memory reducingCoefficient,
        uint month)
        internal
    {
        reduceValueByCoefficientAndUpdateSumIfNeeded(
            sequence,
            sequence,
            reducingCoefficient,
            month,
            false);
    }

    function reduceValueByCoefficientAndUpdateSum(
        Value storage sequence,
        Value storage sumSequence,
        FractionUtils.Fraction memory reducingCoefficient,
        uint month) internal
    {
        reduceValueByCoefficientAndUpdateSumIfNeeded(
            sequence,
            sumSequence,
            reducingCoefficient,
            month,
            true);
    }

    function reduceValueByCoefficientAndUpdateSumIfNeeded(
        Value storage sequence,
        Value storage sumSequence,
        FractionUtils.Fraction memory reducingCoefficient,
        uint month,
        bool hasSumSequence) internal
    {
        require(month + 1 >= sequence.firstUnprocessedMonth, "Cannot reduce value in the past");
        if (hasSumSequence) {
            require(month + 1 >= sumSequence.firstUnprocessedMonth, "Cannot reduce value in the past");
        }
        require(
            reducingCoefficient.numerator <= reducingCoefficient.denominator,
            "Increasing of values is not implemented");
        if (sequence.firstUnprocessedMonth == 0) {
            return;
        }
        uint value = getAndUpdateValue(sequence, month);
        if (value.approximatelyEqual(0)) {
            return;
        }

        uint newValue = sequence.value * reducingCoefficient.numerator / reducingCoefficient.denominator;
        if (hasSumSequence) {
            subtractFromValue(sumSequence, sequence.value.boundedSub(newValue), month);
        }
        sequence.value = newValue;

        for (uint i = month + 1; i <= sequence.lastChangedMonth; ++i) {
            uint newDiff = sequence.subtractDiff[i]
                * reducingCoefficient.numerator
                / reducingCoefficient.denominator;
            if (hasSumSequence) {
                sumSequence.subtractDiff[i] = sumSequence.subtractDiff[i]
                    .boundedSub(sequence.subtractDiff[i].boundedSub(newDiff));
            }
            sequence.subtractDiff[i] = newDiff;
        }
    }

    function getValueInSequence(Sequence storage sequence, uint month) internal view returns (uint) {
        if (sequence.firstUnprocessedMonth == 0) {
            return 0;
        }

        if (sequence.firstUnprocessedMonth <= month) {
            uint value = sequence.value[sequence.firstUnprocessedMonth - 1];
            for (uint i = sequence.firstUnprocessedMonth; i <= month; ++i) {
                value = value + sequence.addDiff[i] - sequence.subtractDiff[i];
            }
            return value;
        } else {
            return sequence.value[month];
        }
    }

    function getValuesInSequence(Sequence storage sequence) internal view returns (uint[] memory values) {
        if (sequence.firstUnprocessedMonth == 0) {
            return values;
        }
        uint begin = sequence.firstUnprocessedMonth - 1;
        uint end = sequence.lastChangedMonth + 1;
        if (end <= begin) {
            end = begin + 1;
        }
        values = new uint[](end - begin);
        values[0] = sequence.value[sequence.firstUnprocessedMonth - 1];
        for (uint i = 0; i + 1 < values.length; ++i) {
            uint month = sequence.firstUnprocessedMonth + i;
            values[i + 1] = values[i] + sequence.addDiff[month] - sequence.subtractDiff[month];
        }
    }

    function getValue(Value storage sequence, uint month) internal view returns (uint) {
        require(
            month + 1 >= sequence.firstUnprocessedMonth,
            "Cannot calculate value in the past");
        if (sequence.firstUnprocessedMonth == 0) {
            return 0;
        }

        if (sequence.firstUnprocessedMonth <= month) {
            uint value = sequence.value;
            for (uint i = sequence.firstUnprocessedMonth; i <= month; ++i) {
                value = value + sequence.addDiff[i] - sequence.subtractDiff[i];
            }
            return value;
        } else {
            return sequence.value;
        }
    }

    function getValues(Value storage sequence) internal view returns (uint[] memory values) {
        if (sequence.firstUnprocessedMonth == 0) {
            return values;
        }
        uint begin = sequence.firstUnprocessedMonth - 1;
        uint end = sequence.lastChangedMonth + 1;
        if (end <= begin) {
            end = begin + 1;
        }
        values = new uint[](end - begin);
        values[0] = sequence.value;
        for (uint i = 0; i + 1 < values.length; ++i) {
            uint month = sequence.firstUnprocessedMonth + i;
            values[i + 1] = values[i] + sequence.addDiff[month] - sequence.subtractDiff[month];
        }
    }
}

// SPDX-License-Identifier: AGPL-3.0-only

/*
    IRandom.sol - SKALE Manager Interfaces
    Copyright (C) 2022-Present SKALE Labs
    @author Dmytro Stebaiev

    SKALE Manager Interfaces is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    SKALE Manager Interfaces is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with SKALE Manager Interfaces.  If not, see <https://www.gnu.org/licenses/>.
*/

pragma solidity >=0.6.10 <0.9.0;


interface IRandom {
    struct RandomGenerator {
        uint seed;
    }
}

// SPDX-License-Identifier: AGPL-3.0-only

/*
    IContractManager.sol - SKALE Manager Interfaces
    Copyright (C) 2021-Present SKALE Labs
    @author Dmytro Stebaeiv

    SKALE Manager Interfaces is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    SKALE Manager Interfaces is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with SKALE Manager Interfaces.  If not, see <https://www.gnu.org/licenses/>.
*/

pragma solidity >=0.6.10 <0.9.0;

interface IContractManager {
    /**
     * @dev Emitted when contract is upgraded.
     */
    event ContractUpgraded(string contractsName, address contractsAddress);

    function initialize() external;
    function setContractsAddress(string calldata contractsName, address newContractsAddress) external;
    function contracts(bytes32 nameHash) external view returns (address);
    function getDelegationPeriodManager() external view returns (address);
    function getBounty() external view returns (address);
    function getValidatorService() external view returns (address);
    function getTimeHelpers() external view returns (address);
    function getConstantsHolder() external view returns (address);
    function getSkaleToken() external view returns (address);
    function getTokenState() external view returns (address);
    function getPunisher() external view returns (address);
    function getContract(string calldata name) external view returns (address);
}

// SPDX-License-Identifier: AGPL-3.0-only

/*
    IPermissions.sol - SKALE Manager
    Copyright (C) 2018-Present SKALE Labs
    @author Artem Payvin

    SKALE Manager is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    SKALE Manager is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with SKALE Manager.  If not, see <https://www.gnu.org/licenses/>.
*/

pragma solidity >=0.6.10 <0.9.0;

interface IPermissions {
    function initialize(address contractManagerAddress) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "@openzeppelin/contracts-upgradeable/utils/structs/EnumerableSetUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
import "@skalenetwork/skale-manager-interfaces/thirdparty/openzeppelin/IAccessControlUpgradeableLegacy.sol";
import "./InitializableWithGap.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms.
 *
 * 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:
 *
 * ```
 * 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}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, _msgSender()));
 *     ...
 * }
 * ```
 *
 * 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}.
 */
abstract contract AccessControlUpgradeableLegacy is InitializableWithGap, ContextUpgradeable, IAccessControlUpgradeableLegacy {
    function __AccessControl_init() internal initializer {
        __Context_init_unchained();
        __AccessControl_init_unchained();
    }

    function __AccessControl_init_unchained() internal initializer {


    }

    using EnumerableSetUpgradeable for EnumerableSetUpgradeable.AddressSet;

    struct RoleData {
        EnumerableSetUpgradeable.AddressSet members;
        bytes32 adminRole;
    }

    mapping (bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view override returns (bool) {
        return _roles[role].members.contains(account);
    }

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) public view override returns (uint256) {
        return _roles[role].members.length();
    }

    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) public view override returns (address) {
        return _roles[role].members.at(index);
    }

    /**
     * @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 override returns (bytes32) {
        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.
     */
    function grantRole(bytes32 role, address account) public virtual override {
        require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant");

        _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.
     */
    function revokeRole(bytes32 role, address account) public virtual override {
        require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke");

        _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 granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        _roles[role].adminRole = adminRole;
    }

    function _grantRole(bytes32 role, address account) private {
        if (_roles[role].members.add(account)) {
            emit RoleGranted(role, account, _msgSender());
        }
    }

    function _revokeRole(bytes32 role, address account) private {
        if (_roles[role].members.remove(account)) {
            emit RoleRevoked(role, account, _msgSender());
        }
    }

    uint256[49] private __gap;
}

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

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSetUpgradeable {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

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

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

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

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

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

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

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

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

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

            return true;
        } else {
            return false;
        }
    }

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

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

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

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

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

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

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

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

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

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

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

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

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

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

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

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

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

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

        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

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

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

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

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

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

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

        assembly {
            result := store
        }

        return result;
    }
}

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

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

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

    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;
    }
    uint256[50] private __gap;
}

// SPDX-License-Identifier: AGPL-3.0-only

/*
    IAccessControlUpgradeableLegacy.sol - SKALE Manager
    Copyright (C) 2018-Present SKALE Labs
    @author Artem Payvin

    SKALE Manager is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    SKALE Manager is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with SKALE Manager.  If not, see <https://www.gnu.org/licenses/>.
*/

pragma solidity >=0.6.10 <0.9.0;

interface IAccessControlUpgradeableLegacy {
    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {_setupRole}.
     */
    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);
    
    function grantRole(bytes32 role, address account) external;
    function revokeRole(bytes32 role, address account) external;
    function renounceRole(bytes32 role, address account) external;
    function hasRole(bytes32 role, address account) external view returns (bool);
    function getRoleMemberCount(bytes32 role) external view returns (uint256);
    function getRoleMember(bytes32 role, uint256 index) external view returns (address);
    function getRoleAdmin(bytes32 role) external view returns (bytes32);
}

// SPDX-License-Identifier: AGPL-3.0-only

pragma solidity ^0.8.7;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";


contract InitializableWithGap is Initializable {
    uint256[50] private ______gap;
}

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

pragma solidity ^0.8.0;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have 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.
 *
 * 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 initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

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

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

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

    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

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

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: AGPL-3.0-only

/*
    IConstantsHolder.sol - SKALE Manager Interfaces
    Copyright (C) 2021-Present SKALE Labs
    @author Artem Payvin

    SKALE Manager Interfaces is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    SKALE Manager Interfaces is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with SKALE Manager Interfaces.  If not, see <https://www.gnu.org/licenses/>.
*/

pragma solidity >=0.6.10 <0.9.0;

interface IConstantsHolder {

    /**
     * @dev Emitted when constants updated.
     */
    event ConstantUpdated(
        bytes32 indexed constantHash,
        uint previousValue,
        uint newValue
    );

    function setPeriods(uint32 newRewardPeriod, uint32 newDeltaPeriod) external;
    function setCheckTime(uint newCheckTime) external;
    function setLatency(uint32 newAllowableLatency) external;
    function setMSR(uint newMSR) external;
    function setLaunchTimestamp(uint timestamp) external;
    function setRotationDelay(uint newDelay) external;
    function setProofOfUseLockUpPeriod(uint periodDays) external;
    function setProofOfUseDelegationPercentage(uint percentage) external;
    function setLimitValidatorsPerDelegator(uint newLimit) external;
    function setSchainCreationTimeStamp(uint timestamp) external;
    function setMinimalSchainLifetime(uint lifetime) external;
    function setComplaintTimeLimit(uint timeLimit) external;
    function msr() external view returns (uint);
    function launchTimestamp() external view returns (uint);
    function rotationDelay() external view returns (uint);
    function limitValidatorsPerDelegator() external view returns (uint);
    function schainCreationTimeStamp() external view returns (uint);
    function minimalSchainLifetime() external view returns (uint);
    function complaintTimeLimit() external view returns (uint);
}

// SPDX-License-Identifier: AGPL-3.0-only

/*
    MathUtils.sol - SKALE Manager
    Copyright (C) 2018-Present SKALE Labs
    @author Dmytro Stebaiev

    SKALE Manager is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    SKALE Manager is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with SKALE Manager.  If not, see <https://www.gnu.org/licenses/>.
*/

pragma solidity 0.8.11;


library MathUtils {

    uint constant private _EPS = 1e6;

    event UnderflowError(
        uint a,
        uint b
    );    

    function boundedSub(uint256 a, uint256 b) internal returns (uint256) {
        if (a >= b) {
            return a - b;
        } else {
            emit UnderflowError(a, b);
            return 0;
        }
    }

    function boundedSubWithoutEvent(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a >= b) {
            return a - b;
        } else {
            return 0;
        }
    }

    function muchGreater(uint256 a, uint256 b) internal pure returns (bool) {
        assert(type(uint).max - _EPS > b);
        return a > b + _EPS;
    }

    function approximatelyEqual(uint256 a, uint256 b) internal pure returns (bool) {
        if (a > b) {
            return a - b < _EPS;
        } else {
            return b - a < _EPS;
        }
    }
}

// SPDX-License-Identifier: AGPL-3.0-only

/*
    FractionUtils.sol - SKALE Manager
    Copyright (C) 2018-Present SKALE Labs
    @author Dmytro Stebaiev

    SKALE Manager is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    SKALE Manager is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with SKALE Manager.  If not, see <https://www.gnu.org/licenses/>.
*/

pragma solidity 0.8.11;


library FractionUtils {

    struct Fraction {
        uint numerator;
        uint denominator;
    }

    function createFraction(uint numerator, uint denominator) internal pure returns (Fraction memory) {
        require(denominator > 0, "Division by zero");
        Fraction memory fraction = Fraction({numerator: numerator, denominator: denominator});
        reduceFraction(fraction);
        return fraction;
    }

    function createFraction(uint value) internal pure returns (Fraction memory) {
        return createFraction(value, 1);
    }

    function reduceFraction(Fraction memory fraction) internal pure {
        uint _gcd = gcd(fraction.numerator, fraction.denominator);
        fraction.numerator = fraction.numerator / _gcd;
        fraction.denominator = fraction.denominator / _gcd;
    }
    
    // numerator - is limited by 7*10^27, we could multiply it numerator * numerator - it would less than 2^256-1
    function multiplyFraction(Fraction memory a, Fraction memory b) internal pure returns (Fraction memory) {
        return createFraction(a.numerator * b.numerator, a.denominator * b.denominator);
    }

    function gcd(uint a, uint b) internal pure returns (uint) {
        uint _a = a;
        uint _b = b;
        if (_b > _a) {
            (_a, _b) = swap(_a, _b);
        }
        while (_b > 0) {
            _a = _a % _b;
            (_a, _b) = swap (_a, _b);
        }
        return _a;
    }

    function swap(uint a, uint b) internal pure returns (uint, uint) {
        return (b, a);
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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