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// SPDX-License-Identifier: agpl-3.0

pragma solidity 0.7.5;
pragma experimental ABIEncoderV2;

import './bases/staking/StakingRewards.sol';
import './bases/BaseTokenUpgradeable.sol';
import './bases/staking/interfaces/IOriginatorStaking.sol';
import '../reserve/IReserve.sol';
import '../utils/SafeMathUint128.sol';

import '@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol';
import '@openzeppelin/contracts-upgradeable/token/ERC20/SafeERC20Upgradeable.sol';
import '@openzeppelin/contracts-upgradeable/math/SafeMathUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/proxy/Initializable.sol';


/**
 * @title  OriginatorStaking
 * @notice Contract to stake Originator Hub tokens, tokenize the position and get rewards, inheriting from a distribution manager contract
 * @author Aave / Ethichub
 **/
contract OriginatorStaking is Initializable, StakingRewards, BaseTokenUpgradeable, IStaking, IProjectFundedRewards, IOriginatorManager {
    using SafeERC20Upgradeable for IERC20Upgradeable;
    using SafeMathUpgradeable for uint256;
    using SafeMathUint128 for uint128;

    enum OriginatorStakingState {
        UNINITIALIZED,
        STAKING,
        STAKING_END,
        DEFAULT
    }

    OriginatorStakingState public state;

    IERC20Upgradeable public STAKED_TOKEN;

    /// @notice IReserve to pull from the rewards, needs to have this contract as WITHDRAW role
    IReserve public REWARDS_VAULT;

    bytes32 public constant GOVERNANCE_ROLE = keccak256('GOVERNANCE_ROLE');
 
    uint256 public stakingGoal;
    uint256 public defaultedAmount;

    mapping(address => uint256) public stakerRewardsToClaim;

    bytes32 public constant ORIGINATOR_ROLE = keccak256('ORIGINATOR_ROLE');
    bytes32 public constant AUDITOR_ROLE = keccak256('AUDITOR_ROLE');

    uint256 public DEFAULT_DATE;

    mapping(bytes32 => uint256) public proposerBalances;

    event StateChange(uint256 state);

    event Staked(address indexed from, address indexed onBehalfOf, uint256 amount);
    event Redeem(address indexed from, address indexed to, uint256 amount);
    
    event Withdraw(address indexed proposer, uint256 amount);

    event RewardsAccrued(address user, uint256 amount);
    event RewardsClaimed(address indexed from, address indexed to, uint256 amount);

    event StartRewardsProjectFunded(uint128 previousEmissionPerSecond, uint128 extraEmissionsPerSecond, address lendingContractAddress);
    event EndRewardsProjectFunded(uint128 restoredEmissionsPerSecond, uint128 extraEmissionsPerSecond, address lendingContractAddress);

    modifier onlyGovernance() {
        require(hasRole(GOVERNANCE_ROLE, msg.sender), 'ONLY_GOVERNANCE');
        _;
    }

    modifier onlyEmissionManager() {
        require(hasRole(EMISSION_MANAGER_ROLE, msg.sender), 'ONLY_EMISSION_MANAGER');
        _;
    }

    modifier onlyOnStakingState() {
        require(state == OriginatorStakingState.STAKING, 'ONLY_ON_STAKING_STATE');
        _;
    }

    modifier notZeroAmount(uint256 _amount) {
        require(_amount > 0, 'INVALID_ZERO_AMOUNT');
        _;
    }

    function initialize(
        string memory _name,
        string memory _symbol,
        IERC20Upgradeable _lockedToken,
        IReserve _rewardsVault,
        address _emissionManager,
        uint128 _distributionDuration
    ) public initializer {
        __BaseTokenUpgradeable_init(
            msg.sender,
            0,
            _name,
            _symbol,
            _name
        );
        __StakingRewards_init(_emissionManager, _distributionDuration);
        STAKED_TOKEN = _lockedToken;
        REWARDS_VAULT = _rewardsVault;
        _changeState(OriginatorStakingState.UNINITIALIZED);
    }

    /**
     * @notice Function to set up proposers (originator and auditor)
     * in proposal period.
     * @param _auditor address
     * @param _originator address
     * @param _auditorPercentage uint256 (value * 100 e.g. 20% == 2000)
     * @param _originatorPercentage uint256 (value * 100 e.g. 20% == 2000)
     * @param _stakingGoal uint256 wei amount in Ethix
     * @param _defaultDelay uint256 seconds
     */
    function setUpTerms(
        address _auditor, 
        address _originator,
        address _governance,
        uint256 _auditorPercentage, 
        uint256 _originatorPercentage, 
        uint256 _stakingGoal,
        uint256 _defaultDelay
    ) external override notZeroAmount(_stakingGoal) onlyEmissionManager {
        require(_auditor != _originator, 'PROPOSERS_CANNOT_BE_THE_SAME');
        require(_auditorPercentage != 0 && _originatorPercentage != 0, 'INVALID_PERCENTAGE_ZERO');
        require(state == OriginatorStakingState.UNINITIALIZED, 'ONLY_ON_UNINITILIZED_STATE');

        _setupRole(AUDITOR_ROLE, _auditor);
        _setupRole(ORIGINATOR_ROLE, _originator);
        _setupRole(GOVERNANCE_ROLE, _governance);
            
        _depositProposer(_auditor, _auditorPercentage, _stakingGoal);
        _depositProposer(_originator, _originatorPercentage, _stakingGoal);
        stakingGoal = _stakingGoal;
        DEFAULT_DATE = _defaultDelay.add(DISTRIBUTION_END);
        _changeState(OriginatorStakingState.STAKING);
    }

    /**
     * @notice Function to renew terms in STAKING_END or DEFAULT period.
     * @param _newAuditorPercentage uint256 (value * 100 e.g. 20% == 2000)
     * @param _newOriginatorPercentage uint256 (value * 100 e.g. 20% == 2000)
     * @param _newStakingGoal uint256 wei amount in Ethix
     * @param _newDistributionDuration uint128 seconds (e.g. 365 days == 31536000)
     * @param _newDefaultDelay uint256 seconds (e.g 90 days == 7776000)
     */
    function renewTerms(
        uint256 _newAuditorPercentage,
        uint256 _newOriginatorPercentage,
        uint256 _newStakingGoal,
        uint128 _newDistributionDuration,
        uint256 _newDefaultDelay) external override notZeroAmount(_newStakingGoal) onlyGovernance {
        require(state == OriginatorStakingState.STAKING_END || state == OriginatorStakingState.DEFAULT, 'INVALID_STATE');
        DISTRIBUTION_END = block.timestamp.add(_newDistributionDuration);
        _depositProposer(getRoleMember(AUDITOR_ROLE, 0), _newAuditorPercentage, _newStakingGoal);
        _depositProposer(getRoleMember(ORIGINATOR_ROLE, 0), _newOriginatorPercentage, _newStakingGoal);
        stakingGoal = _newStakingGoal;
        DEFAULT_DATE = _newDefaultDelay.add(DISTRIBUTION_END);
        _changeState(OriginatorStakingState.STAKING);
    }

    /**
     * @notice Function to stake tokens
     * @param _onBehalfOf Address to stake to
     * @param _amount Amount to stake
     **/
    function stake(address _onBehalfOf, uint256 _amount) external override notZeroAmount(_amount) onlyOnStakingState {
        require(!hasReachedGoal(), 'GOAL_HAS_REACHED');

        if (STAKED_TOKEN.balanceOf(address(this)).add(_amount) > stakingGoal) {
            _amount = stakingGoal.sub(STAKED_TOKEN.balanceOf(address(this)));
        }
        uint256 balanceOfUser = balanceOf(_onBehalfOf);
        uint256 accruedRewards =
            _updateUserAssetInternal(_onBehalfOf, address(this), balanceOfUser, totalSupply());
        if (accruedRewards != 0) {
            emit RewardsAccrued(_onBehalfOf, accruedRewards);
            stakerRewardsToClaim[_onBehalfOf] = stakerRewardsToClaim[_onBehalfOf].add(accruedRewards);
        }

        _mint(_onBehalfOf, _amount);
        IERC20Upgradeable(STAKED_TOKEN).safeTransferFrom(msg.sender, address(this), _amount);

        emit Staked(msg.sender, _onBehalfOf, _amount);
    }

    /**
     * @dev Redeems staked tokens, and stop earning rewards
     * @param _to Address to redeem to
     * @param _amount Amount to redeem
     **/
    function redeem(address _to, uint256 _amount) external override notZeroAmount(_amount) {
        require(_checkRedeemEligibilityState(), 'WRONG_STATE');
        require(balanceOf(msg.sender) != 0, 'SENDER_BALANCE_ZERO');

        uint256 balanceOfMessageSender = balanceOf(msg.sender);

        uint256 amountToRedeem =
            (_amount > balanceOfMessageSender) ? balanceOfMessageSender : _amount;

        _updateCurrentUnclaimedRewards(msg.sender, balanceOfMessageSender, true);

        _burn(msg.sender, amountToRedeem);

        IERC20Upgradeable(STAKED_TOKEN).safeTransfer(_to, amountToRedeem);

        emit Redeem(msg.sender, _to, amountToRedeem);
    }

    /**
     * @notice method to withdraw deposited amount.
     * @param _amount Amount to withdraw
     */
    function withdrawProposerStake(uint256 _amount) external override {
        require(state == OriginatorStakingState.STAKING_END, 'ONLY_ON_STAKING_END_STATE');
        bytes32 senderRole = 0x00;
        
        if (msg.sender == getRoleMember(ORIGINATOR_ROLE, 0)) {
            senderRole = ORIGINATOR_ROLE;
        } else if (msg.sender == getRoleMember(AUDITOR_ROLE, 0)) {
            senderRole = AUDITOR_ROLE;
        } else {
            revert('WITHDRAW_PERMISSION_DENIED');
        }
        require(proposerBalances[senderRole] != 0, 'INVALID_ZERO_AMOUNT');

        uint256 amountToWithdraw =
            (_amount > proposerBalances[senderRole]) ? proposerBalances[senderRole] : _amount;

        proposerBalances[senderRole] = proposerBalances[senderRole].sub(amountToWithdraw);
        IERC20Upgradeable(STAKED_TOKEN).safeTransfer(msg.sender, amountToWithdraw);
        emit Withdraw(msg.sender, amountToWithdraw);
    }

    /**
     * @dev Claims an `amount` from Rewards reserve to the address `to`
     * @param _to Address to stake for
     * @param _amount Amount to stake
     **/
    function claimRewards(address payable _to, uint256 _amount) external override {
        uint256 newTotalRewards = _updateCurrentUnclaimedRewards(msg.sender, balanceOf(msg.sender), false);
        uint256 amountToClaim = (_amount == type(uint256).max) ? newTotalRewards : _amount;

        stakerRewardsToClaim[msg.sender] = newTotalRewards.sub(amountToClaim, 'INVALID_AMOUNT');
        require(REWARDS_VAULT.transfer(_to, amountToClaim), 'ERROR_TRANSFER_FROM_VAULT');

        emit RewardsClaimed(msg.sender, _to, amountToClaim);
    }

    /**
     * Function to add an extra emissions per second corresponding to staker rewards when a lending project by this originator
     * is funded.
     * @param _extraEmissionsPerSecond  emissions per second to be added to current ones.
     * @param _lendingContractAddress lending contract address is relationated with this rewards
     */
    function startProjectFundedRewards(uint128 _extraEmissionsPerSecond, address _lendingContractAddress) external override onlyOnStakingState {
        AssetData storage currentDistribution = assets[address(this)];
        uint128 currentEmission = currentDistribution.emissionPerSecond;

        uint128 newEmissionsPerSecond = currentDistribution.emissionPerSecond.add(_extraEmissionsPerSecond);
        DistributionTypes.AssetConfigInput[] memory newAssetConfig = new DistributionTypes.AssetConfigInput[](1);
        newAssetConfig[0] = DistributionTypes.AssetConfigInput({
            emissionPerSecond: newEmissionsPerSecond,
            totalStaked: totalSupply(),
            underlyingAsset: address(this)
        });
        configureAssets(newAssetConfig);

        emit StartRewardsProjectFunded(currentEmission, _extraEmissionsPerSecond, _lendingContractAddress);
    }

    /**
     * Function to end extra emissions per second corresponding to staker rewards when a lending project by this originator
     * is funded.
     * @param _extraEmissionsPerSecond  emissions per second to be added to current ones.
     * @param _lendingContractAddress lending contract address is relationated with this rewards.
     */
    function endProjectFundedRewards(uint128 _extraEmissionsPerSecond, address _lendingContractAddress) external override onlyOnStakingState {
        AssetData storage currentDistribution = assets[address(this)];
        uint128 currentEmission = currentDistribution.emissionPerSecond;
        uint128 newEmissionsPerSecond = currentDistribution.emissionPerSecond.sub(_extraEmissionsPerSecond);
        DistributionTypes.AssetConfigInput[] memory newAssetConfig = new DistributionTypes.AssetConfigInput[](1);
        newAssetConfig[0] = DistributionTypes.AssetConfigInput({
            emissionPerSecond: newEmissionsPerSecond,
            totalStaked: totalSupply(),
            underlyingAsset: address(this)
        });
        configureAssets(newAssetConfig);
        emit EndRewardsProjectFunded(currentEmission, _extraEmissionsPerSecond, _lendingContractAddress);
    }

    /**
     * @notice Amount to substract of the contract when state is default 
     * @param _amount amount to substract
     * @param _role role to substract the amount (Originator, Auditor)
     */
    function liquidateProposerStake(uint256 _amount, bytes32 _role) external override notZeroAmount(_amount) onlyGovernance {
        require(state == OriginatorStakingState.DEFAULT, 'ONLY_ON_DEFAULT');
        require(_role == AUDITOR_ROLE || _role == ORIGINATOR_ROLE, 'INVALID_PROPOSER_ROLE');
        proposerBalances[_role] = proposerBalances[_role].sub(_amount, 'INVALID_LIQUIDATE_AMOUNT');
        IERC20Upgradeable(STAKED_TOKEN).safeTransfer(msg.sender, _amount);
    }

    /**
     * @notice Function to declare contract on staking end state
     * Only governance could change to this state
     **/
    function declareStakingEnd() external override onlyGovernance onlyOnStakingState {
        _endDistributionIfNeeded();
        _changeState(OriginatorStakingState.STAKING_END);
    }

    /**
     * @notice Function to declare as DEFAULT
     * @param _defaultedAmount uint256
     **/
    function declareDefault(uint256 _defaultedAmount) external override onlyGovernance onlyOnStakingState {
        require(block.timestamp >= DEFAULT_DATE, 'DEFAULT_DATE_NOT_REACHED');
        defaultedAmount = _defaultedAmount;
        _endDistributionIfNeeded();
        _changeState(OriginatorStakingState.DEFAULT);
    }

    /**
     * @dev Return the total rewards pending to claim by an staker
     * @param _staker The staker address
     * @return The rewards
     */
    function getTotalRewardsBalance(address _staker) external override view returns (uint256) {
        DistributionTypes.UserStakeInput[] memory userStakeInputs =
            new DistributionTypes.UserStakeInput[](1);
        userStakeInputs[0] = DistributionTypes.UserStakeInput({
            underlyingAsset: address(this),
            stakedByUser: balanceOf(_staker),
            totalStaked: totalSupply()
        });
        return stakerRewardsToClaim[_staker].add(_getUnclaimedRewards(_staker, userStakeInputs));
    }

    /**
     * @notice Check if fulfilled the objective (Only valid on STAKING state!!)
     */
    function hasReachedGoal() public override notZeroAmount(stakingGoal) view returns (bool) {
        if (proposerBalances[ORIGINATOR_ROLE].add(proposerBalances[AUDITOR_ROLE]).add(totalSupply()) >= stakingGoal) {
            return true;
        }
        return  false;
    }

    /**
     * @notice Function to transfer participation amount (originator or auditor)
     */
    function _depositProposer(address _proposer, uint256 _percentage, uint256 _goalAmount) internal {
        uint256 percentageAmount = _calculatePercentage(_goalAmount, _percentage);
        uint256 depositAmount = 0;

        if (_proposer == getRoleMember(ORIGINATOR_ROLE, 0)) {
            depositAmount = _calculateDepositAmount(ORIGINATOR_ROLE, percentageAmount);
            proposerBalances[ORIGINATOR_ROLE] = proposerBalances[ORIGINATOR_ROLE].add(depositAmount);
        } else if (_proposer == getRoleMember(AUDITOR_ROLE, 0)) {
            depositAmount = _calculateDepositAmount(AUDITOR_ROLE, percentageAmount);
            proposerBalances[AUDITOR_ROLE] = proposerBalances[AUDITOR_ROLE].add(depositAmount);
        }
        IERC20Upgradeable(STAKED_TOKEN).safeTransferFrom(_proposer, address(this), depositAmount);
    }

    /**
     * @dev Internal ERC20 _transfer of the tokenized staked tokens
     * @param _from Address to transfer from
     * @param _to Address to transfer to
     * @param _amount Amount to transfer
     **/
    function _transfer(
        address _from,
        address _to,
        uint256 _amount
    ) internal override {
        uint256 balanceOfFrom = balanceOf(_from);
        // Sender
        _updateCurrentUnclaimedRewards(_from, balanceOfFrom, true);

        // Recipient
        if (_from != _to) {
            uint256 balanceOfTo = balanceOf(_to);
            _updateCurrentUnclaimedRewards(_to, balanceOfTo, true);
        }

        super._transfer(_from, _to, _amount);
    }

    /** 
     * @dev Check if the state of contract is suitable to redeem
     */
    function _checkRedeemEligibilityState() internal view returns (bool) {
        if (state == OriginatorStakingState.STAKING_END) {
            return true;
        } else if (state == OriginatorStakingState.DEFAULT && defaultedAmount <= proposerBalances[ORIGINATOR_ROLE].add(proposerBalances[AUDITOR_ROLE])) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Updates the user state related with his accrued rewards
     * @param _user Address of the user
     * @param _userBalance The current balance of the user
     * @param _updateStorage Boolean flag used to update or not the stakerRewardsToClaim of the user
     * @return The unclaimed rewards that were added to the total accrued
     **/
    function _updateCurrentUnclaimedRewards(
        address _user,
        uint256 _userBalance,
        bool _updateStorage
    ) internal returns (uint256) {
        uint256 accruedRewards =
            _updateUserAssetInternal(_user, address(this), _userBalance, totalSupply());
        uint256 unclaimedRewards = stakerRewardsToClaim[_user].add(accruedRewards);

        if (accruedRewards != 0) {
            if (_updateStorage) {
                stakerRewardsToClaim[_user] = unclaimedRewards;
            }
            emit RewardsAccrued(_user, accruedRewards);
        }

        return unclaimedRewards;
    }

    /**
     * @notice Function to calculate a percentage of an amount
     * @param _amount Amount to calculate the percentage of
     * @param _percentage Percentage to calculate of this amount
     * @return (amount)
     */
    function _calculatePercentage(uint256 _amount, uint256 _percentage) internal pure returns (uint256) {
        return uint256(_amount.mul(_percentage).div(10000));
    }

    /**
     * @notice Function to get the actual participation amount
     * of proposers according the amount that already exists in the contract
     * @param _role Auditor or originator role
     * @param _percentageAmount Percentage of staking goal amount
     * Note _percentageAmount SHOULD BE GREATER than the previously existing amount
     */
    function _calculateDepositAmount(bytes32 _role, uint256 _percentageAmount) internal view returns (uint256){
        return uint256(_percentageAmount.sub(proposerBalances[_role]));
    }

    /**
     * @notice Function to change contract state
     * @param _newState New contract state
     **/
    function _changeState(OriginatorStakingState _newState) internal {
        state = _newState;
        emit StateChange(uint256(_newState));
    }

    /**
     * @notice Function to change DISTRIBUTION_END if timestamp is less than the initial one
     **/
    function _endDistributionIfNeeded() internal {
        if (block.timestamp <= DISTRIBUTION_END) {
            _changeDistributionEndDate(block.timestamp);
        }
    }
}

// SPDX-License-Identifier: agpl-3.0

pragma solidity 0.7.5;
pragma experimental ABIEncoderV2;

import './lib/DistributionTypes.sol';
import './interfaces/IStakingRewards.sol';

import '@openzeppelin/contracts-upgradeable/math/SafeMathUpgradeable.sol';
import '../../../utils/SafeMathUint128.sol';
import '@openzeppelin/contracts-upgradeable/proxy/Initializable.sol';
import '@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol';

/**
 * @title StakingRewards
 * @notice Accounting contract to manage multiple staking distributions
 * @author Aave / Ethichub
 **/
contract StakingRewards is Initializable, IStakingRewards, AccessControlUpgradeable {
    bytes32 public constant EMISSION_MANAGER_ROLE = keccak256('EMISSION_MANAGER');
    using SafeMathUpgradeable for uint256;
    using SafeMathUint128 for uint128;

    struct AssetData {
        uint128 emissionPerSecond;
        uint128 lastUpdateTimestamp;
        uint256 index;
        mapping(address => uint256) users;
    }

    uint256 public DISTRIBUTION_END;

    uint8 constant public PRECISION = 18;

    mapping(address => AssetData) public assets;

    event AssetConfigUpdated(address indexed asset, uint256 emission);
    event AssetIndexUpdated(address indexed asset, uint256 index);
    event UserIndexUpdated(address indexed user, address indexed asset, uint256 index);
    event DistributionEndChanged(uint256 distributionEnd);

    function __StakingRewards_init(address emissionManager, uint256 distributionDuration)
        public
        initializer
    {
        __AccessControl_init_unchained();
        DISTRIBUTION_END = block.timestamp.add(distributionDuration);
        _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _setupRole(EMISSION_MANAGER_ROLE, emissionManager);
    }

    /**
     * @dev Configures the distribution of rewards for a list of assets
     * @param assetsConfigInput The list of configurations to apply
     **/
    function configureAssets(DistributionTypes.AssetConfigInput[] memory assetsConfigInput)
        public
        override
    {
        require(hasRole(EMISSION_MANAGER_ROLE, msg.sender), 'ONLY_EMISSION_MANAGER');

        for (uint256 i = 0; i < assetsConfigInput.length; i++) {
            AssetData storage assetConfig = assets[assetsConfigInput[i].underlyingAsset];

            _updateAssetStateInternal(
                assetsConfigInput[i].underlyingAsset,
                assetConfig,
                assetsConfigInput[i].totalStaked
            );

            assetConfig.emissionPerSecond = assetsConfigInput[i].emissionPerSecond;

            emit AssetConfigUpdated(
                assetsConfigInput[i].underlyingAsset,
                assetsConfigInput[i].emissionPerSecond
            );
        }
    }

    /**
     * @notice Change distribution end datetime
     * @param _distributionEndDate new distribution end datetime (UNIX Timestamp)
     */
    function changeDistributionEndDate(uint256 _distributionEndDate) public override {
        require(hasRole(EMISSION_MANAGER_ROLE, msg.sender), 'ONLY_EMISSION_MANAGER');
        return _changeDistributionEndDate(_distributionEndDate);
    }

    /**
     * @notice Change distribution end datetime internal function
     * @param _distributionEndDate new distribution end datetime (UNIX Timestamp)
     */
    function _changeDistributionEndDate(uint256 _distributionEndDate) internal {
        DISTRIBUTION_END = _distributionEndDate;
        emit DistributionEndChanged(DISTRIBUTION_END);
    }

    /**
     * @dev Updates the state of one distribution, mainly rewards index and timestamp
     * @param underlyingAsset The address used as key in the distribution
     * @param assetConfig Storage pointer to the distribution's config
     * @param totalStaked Current total of staked assets for this distribution
     * @return The new distribution index
     **/
    function _updateAssetStateInternal(
        address underlyingAsset,
        AssetData storage assetConfig,
        uint256 totalStaked
    ) internal returns (uint256) {
        uint256 oldIndex = assetConfig.index;
        uint128 lastUpdateTimestamp = assetConfig.lastUpdateTimestamp;

        if (block.timestamp == lastUpdateTimestamp) {
            return oldIndex;
        }

        uint256 newIndex =
            _getAssetIndex(
                oldIndex,
                assetConfig.emissionPerSecond,
                lastUpdateTimestamp,
                totalStaked
            );

        if (newIndex != oldIndex) {
            assetConfig.index = newIndex;
            emit AssetIndexUpdated(underlyingAsset, newIndex);
        }

        assetConfig.lastUpdateTimestamp = uint128(block.timestamp);

        return newIndex;
    }

    /**
     * @dev Updates the state of an user in a distribution
     * @param user The user's address
     * @param asset The address of the reference asset of the distribution
     * @param stakedByUser Amount of tokens staked by the user in the distribution at the moment
     * @param totalStaked Total tokens staked in the distribution
     * @return The accrued rewards for the user until the moment
     **/
    function _updateUserAssetInternal(
        address user,
        address asset,
        uint256 stakedByUser,
        uint256 totalStaked
    ) internal returns (uint256) {
        AssetData storage assetData = assets[asset];
        uint256 userIndex = assetData.users[user];
        uint256 accruedRewards = 0;

        uint256 newIndex = _updateAssetStateInternal(asset, assetData, totalStaked);

        if (userIndex != newIndex) {
            if (stakedByUser != 0) {
                accruedRewards = _getRewards(stakedByUser, newIndex, userIndex);
            }

            assetData.users[user] = newIndex;
            emit UserIndexUpdated(user, asset, newIndex);
        }

        return accruedRewards;
    }

    /**
     * @dev Used by "frontend" stake contracts to update the data of an user when claiming rewards from there
     * @param user The address of the user
     * @param stakes List of structs of the user data related with his stake
     * @return The accrued rewards for the user until the moment
     **/
    function _claimRewards(address payable user, DistributionTypes.UserStakeInput[] memory stakes)
        internal
        returns (uint256)
    {
        uint256 accruedRewards = 0;

        for (uint256 i = 0; i < stakes.length; i++) {
            accruedRewards = accruedRewards.add(
                _updateUserAssetInternal(
                    user,
                    stakes[i].underlyingAsset,
                    stakes[i].stakedByUser,
                    stakes[i].totalStaked
                )
            );
        }

        return accruedRewards;
    }

    /**
     * @dev Return the accrued rewards for an user over a list of distribution
     * @param user The address of the user
     * @param stakes List of structs of the user data related with his stake
     * @return The accrued rewards for the user until the moment
     **/
    function _getUnclaimedRewards(address user, DistributionTypes.UserStakeInput[] memory stakes)
        internal
        view
        returns (uint256)
    {
        uint256 accruedRewards = 0;

        for (uint256 i = 0; i < stakes.length; i++) {
            AssetData storage assetConfig = assets[stakes[i].underlyingAsset];
            uint256 assetIndex =
                _getAssetIndex(
                    assetConfig.index,
                    assetConfig.emissionPerSecond,
                    assetConfig.lastUpdateTimestamp,
                    stakes[i].totalStaked
                );

            accruedRewards = accruedRewards.add(
                _getRewards(stakes[i].stakedByUser, assetIndex, assetConfig.users[user])
            );
        }
        return accruedRewards;
    }

    /**
     * @dev Internal function for the calculation of user's rewards on a distribution
     * @param principalUserBalance Amount staked by the user on a distribution
     * @param reserveIndex Current index of the distribution
     * @param userIndex Index stored for the user, representation his staking moment
     * @return The rewards
     **/
    function _getRewards(
        uint256 principalUserBalance,
        uint256 reserveIndex,
        uint256 userIndex
    ) internal view returns (uint256) {
        return principalUserBalance.mul(reserveIndex.sub(userIndex)).div(10**uint256(PRECISION));
    }

    /**
     * @dev Calculates the next value of an specific distribution index, with validations
     * @param currentIndex Current index of the distribution
     * @param emissionPerSecond Representing the total rewards distributed per second per asset unit, on the distribution
     * @param lastUpdateTimestamp Last moment this distribution was updated
     * @param totalBalance of tokens considered for the distribution
     * @return The new index.
     **/
    function _getAssetIndex(
        uint256 currentIndex,
        uint256 emissionPerSecond,
        uint128 lastUpdateTimestamp,
        uint256 totalBalance
    ) internal view returns (uint256) {
        if (
            emissionPerSecond == 0 ||
            totalBalance == 0 ||
            lastUpdateTimestamp == block.timestamp ||
            lastUpdateTimestamp >= DISTRIBUTION_END
        ) {
            return currentIndex;
        }

        uint256 currentTimestamp =
            block.timestamp > DISTRIBUTION_END ? DISTRIBUTION_END : block.timestamp;
        uint256 timeDelta = currentTimestamp.sub(lastUpdateTimestamp);
        return
            emissionPerSecond.mul(timeDelta).mul(10**uint256(PRECISION)).div(totalBalance).add(
                currentIndex
            );
    }

    /**
     * @dev Returns the data of an user on a distribution
     * @param user Address of the user
     * @param asset The address of the reference asset of the distribution
     * @return The new index
     **/
    function getUserAssetData(address user, address asset) public view returns (uint256) {
        return assets[asset].users[user];
    }
}

// SPDX-License-Identifier: gpl-3.0

pragma solidity 0.7.5;

import '../ERCs/ERC677/ERC677Upgradeable.sol';
import '../ERCs/ERC2612/ERC2612Upgradeable.sol';

import '@openzeppelin/contracts-upgradeable/proxy/Initializable.sol';
contract BaseTokenUpgradeable is Initializable, ERC677Upgradeable, ERC2612Upgradeable {

    function __BaseTokenUpgradeable_init(
        address _initialAccount,
        uint256 _initialBalance,
        string memory _name,
        string memory _symbol,
        string memory _EIP712Name
    ) public initializer {
        __ERC677_init(_initialAccount, _initialBalance, _name, _symbol);
        __ERC2612_init(_EIP712Name);
    }

    function permit(
        address _holder,
        address _spender,
        uint256 _nonce,
        uint256 _expiry,
        bool _allowed,
        uint8 _v,
        bytes32 _r,
        bytes32 _s
    ) public override {
        bytes32 digest =
            keccak256(
                abi.encodePacked(
                    '\x19\x01',
                    DOMAIN_SEPARATOR,
                    keccak256(
                        abi.encode(PERMIT_TYPEHASH, _holder, _spender, _nonce, _expiry, _allowed)
                    )
                )
            );
        require(_holder != address(0), 'Token: invalid-address-0');
        require(_holder == ecrecover(digest, _v, _r, _s), 'Token: invalid-permit');
        require(_expiry == 0 || block.timestamp <= _expiry, 'Token: permit-expired');
        require(_nonce == nonces[_holder]++, 'Token: invalid-nonce');
        uint256 _amount =
            _allowed ? 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff : 0;
        _approve(_holder, _spender, _amount);
    }
}

// SPDX-License-Identifier: agpl-3.0

pragma solidity 0.7.5;


interface IOriginatorManager {
    function setUpTerms(
        address auditor,
        address originator,
        address governance,
        uint256 auditorPercentage,
        uint256 originatorPercentage,
        uint256 stakingGoal,
        uint256 defaultDelay
    ) external;

    function renewTerms(
        uint256 newAuditorPercentage,
        uint256 newOriginatorPercentage,
        uint256 newStakingGoal,
        uint128 newDistributionDuration,
        uint256 newDefaultDelay
    ) external;

    function declareDefault(uint256 defaultedAmount) external;
    function liquidateProposerStake(uint256 amount, bytes32 role) external;
    function declareStakingEnd() external;
    function hasReachedGoal() external view returns (bool);
}


interface IProjectFundedRewards {
    function startProjectFundedRewards(uint128 extraEmissionsPerSecond, address lendingContractAddress) external;
    function endProjectFundedRewards(uint128 extraEmissionsPerSecond, address lendingContractAddress) external;
}


interface IStaking {
    function stake(address to, uint256 amount) external;
    function redeem(address to, uint256 amount) external;
    function claimRewards(address payable to, uint256 amount) external;
    function withdrawProposerStake(uint256 amount) external;
    function getTotalRewardsBalance(address staker) external view returns (uint256);
}

// SPDX-License-Identifier: gpl-3.0

pragma solidity 0.7.5;

interface IReserve {
    event Transfer(address indexed to, uint256 amount);
    event RescueFunds(address token, address indexed to, uint256 amount);

    function balance() external view returns (uint256);

    function transfer(address payable _to, uint256 _value) external returns (bool);

    function rescueFunds(
        address _tokenToRescue,
        address _to,
        uint256 _amount
    ) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMathUint128 {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint128 a, uint128 b) internal pure returns (uint128) {
        uint128 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint128 a, uint128 b) internal pure returns (uint128) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint128 a, uint128 b, string memory errorMessage) internal pure returns (uint128) {
        require(b <= a, errorMessage);
        uint128 c = a - b;

        return c;
    }
    

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint128 a, uint128 b) internal pure returns (uint128) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint128 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint128 a, uint128 b) internal pure returns (uint128) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint128 a, uint128 b, string memory errorMessage) internal pure returns (uint128) {
        require(b > 0, errorMessage);
        uint128 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint128 a, uint128 b) internal pure returns (uint128) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint128 a, uint128 b, string memory errorMessage) internal pure returns (uint128) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

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

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20Upgradeable.sol";
import "../../math/SafeMathUpgradeable.sol";
import "../../utils/AddressUpgradeable.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20Upgradeable {
    using SafeMathUpgradeable for uint256;
    using AddressUpgradeable for address;

    function safeTransfer(IERC20Upgradeable token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20Upgradeable token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20Upgradeable token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20Upgradeable token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMathUpgradeable {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

// solhint-disable-next-line compiler-version
pragma solidity >=0.4.24 <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 {UpgradeableProxy-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.
 */
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() {
        require(_initializing || _isConstructor() || !_initialized, "Initializable: contract is already initialized");

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

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /// @dev Returns true if and only if the function is running in the constructor
    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

// SPDX-License-Identifier: agpl-3.0

pragma solidity 0.7.5;
pragma experimental ABIEncoderV2;

library DistributionTypes {
    struct AssetConfigInput {
        uint128 emissionPerSecond;
        uint256 totalStaked;
        address underlyingAsset;
    }

    struct UserStakeInput {
        address underlyingAsset;
        uint256 stakedByUser;
        uint256 totalStaked;
    }
}

// SPDX-License-Identifier: agpl-3.0

pragma solidity 0.7.5;
pragma experimental ABIEncoderV2;

import '../lib/DistributionTypes.sol';

interface IStakingRewards {
    function changeDistributionEndDate(uint256 date) external;
    function configureAssets(DistributionTypes.AssetConfigInput[] memory assetsConfigInput)
        external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/EnumerableSetUpgradeable.sol";
import "../utils/AddressUpgradeable.sol";
import "../utils/ContextUpgradeable.sol";
import "../proxy/Initializable.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, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControlUpgradeable is Initializable, ContextUpgradeable {
    function __AccessControl_init() internal initializer {
        __Context_init_unchained();
        __AccessControl_init_unchained();
    }

    function __AccessControl_init_unchained() internal initializer {
    }
    using EnumerableSetUpgradeable for EnumerableSetUpgradeable.AddressSet;
    using AddressUpgradeable for address;

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

    mapping (bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, 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);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view 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 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 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 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 {
        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 {
        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 {
        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.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        emit RoleAdminChanged(role, _roles[role].adminRole, adminRole);
        _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

pragma solidity >=0.6.2 <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;
        // solhint-disable-next-line no-inline-assembly
        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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            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] = toDeleteIndex + 1; // All indexes are 1-based

            // 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) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // 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);
    }

    // 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))));
    }


    // 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));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;
import "../proxy/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 GSN 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 initializer {
        __Context_init_unchained();
    }

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

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
    uint256[50] private __gap;
}

// SPDX-License-Identifier: gpl-3.0

pragma solidity 0.7.5;

import './IERC677.sol';
import './IERC677Receiver.sol';

import '@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol';
import '@openzeppelin/contracts-upgradeable/proxy/Initializable.sol';

contract ERC677Upgradeable is Initializable, IERC677, ERC20Upgradeable {
    /**
     * @dev Sets the values for {_name} and {_symbol}, initializes {_decimals} with
     * a default value of 18. And mints {_initialBalance} to address {_initialAccount}
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    function __ERC677_init(
        address _initialAccount,
        uint256 _initialBalance,
        string memory _name,
        string memory _symbol
    ) internal initializer {
        __ERC20_init(_name, _symbol);
        if (_initialBalance != 0) {
          _mint(_initialAccount, _initialBalance);
        }
    }

    /**
     * @dev check if an address is a contract.
     * @param _addr The address to check.
     */
    function isContract(address _addr) private view returns (bool hasCode) {
        uint256 length;
        assembly {
            length := extcodesize(_addr)
        }
        return length > 0;
    }

    /**
     * @dev transfer token to a contract address with additional data if the recipient is a contact.
     * @param _to The address to transfer to.
     * @param _value The amount to be transferred.
     * @param _data The extra data to be passed to the receiving contract.
     */
    function transferAndCall(
        address _to,
        uint256 _value,
        bytes memory _data
    ) public virtual override returns (bool success) {
        require(super.transfer(_to, _value), 'ERC677Upgradeable: transfer failed');
        if (isContract(_to)) {
            IERC677Receiver(_to).onTokenTransfer(msg.sender, _value, _data);
        }
        return true;
    }
}

// SPDX-License-Identifier: gpl-3.0

pragma solidity 0.7.5;

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

abstract contract ERC2612Upgradeable is Initializable {
    // --- EIP712 niceties ---
    bytes32 public DOMAIN_SEPARATOR;
    // bytes32 public constant PERMIT_TYPEHASH = keccak256("Permit(address holder,address spender,uint256 nonce,uint256 expiry,bool allowed)");
    bytes32 public PERMIT_TYPEHASH;

    string public version;
    mapping(address => uint256) public nonces;

    function __ERC2612_init(string memory _EIP712Name) internal initializer {
        version = '1';
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256(
                    'EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'
                ),
                keccak256(bytes(_EIP712Name)),
                keccak256(bytes(version)),
                getChainId(),
                address(this)
            )
        );
        PERMIT_TYPEHASH = 0xea2aa0a1be11a07ed86d755c93467f4f82362b452371d1ba94d1715123511acb;
    }

    function permit(
        address holder,
        address spender,
        uint256 nonce,
        uint256 expiry,
        bool allowed,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual;

    function getChainId() public pure returns (uint256 chainId) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            chainId := chainid()
        }
    }
}

// SPDX-License-Identifier: gpl-3.0

pragma solidity 0.7.5;

interface IERC677 {
    function transferAndCall(
        address to,
        uint256 value,
        bytes memory data
    ) external returns (bool ok);

    event Transfer(address indexed from, address indexed to, uint256 value, bytes data);
}

// SPDX-License-Identifier: gpl-3.0

pragma solidity 0.7.5;

interface IERC677Receiver {
    function onTokenTransfer(
        address from,
        uint256 amount,
        bytes calldata data
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../../utils/ContextUpgradeable.sol";
import "./IERC20Upgradeable.sol";
import "../../math/SafeMathUpgradeable.sol";
import "../../proxy/Initializable.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable {
    using SafeMathUpgradeable for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal initializer {
        __Context_init_unchained();
        __ERC20_init_unchained(name_, symbol_);
    }

    function __ERC20_init_unchained(string memory name_, string memory symbol_) internal initializer {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
    uint256[44] private __gap;
}

{
  "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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