Contract Address Details

0xd23a32d31871C58650a226E3b4683dE6Bace7581

Contract Name: Staking

Creator: 0xc7d98c–7f3521 at 0x8516bd–499b73

Balance: 0 CLO

Tokens: Fetching tokens... Error trying to fetch balances.

Transactions: 0 Transactions

Transfers: 0 Transfers

Gas Used: Fetching gas used...

Last Balance Update: 18597412

Transactions Internal Transactions Coin Balance History Code Read Contract Write Contract

Contract name:: Staking
Optimization enabled: true

Compiler version: v0.8.6+commit.11564f7e
Optimization runs: 200

EVM Version: default
Verified at: 2024-09-26T15:34:38.780116Z

Contract source code

// File: contracts/EnumerableSet.sol





pragma solidity ^0.8.0;



/**

 * @dev Library for managing

 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive

 * types.

 *

 * Sets have the following properties:

 *

 * - Elements are added, removed, and checked for existence in constant time

 * (O(1)).

 * - Elements are enumerated in O(n). No guarantees are made on the ordering.

 *

 * ```

 * contract Example {

 *     // Add the library methods

 *     using EnumerableSet for EnumerableSet.AddressSet;

 *

 *     // Declare a set state variable

 *     EnumerableSet.AddressSet private mySet;

 * }

 * ```

 *

 * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256`

 * (`UintSet`) are supported.

 */

library EnumerableSet {



    struct AddressSet {

        // Storage of set values

        address[] _values;



        // Position of the value in the `values` array, plus 1 because index 0

        // means a value is not in the set.

        mapping (address => 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(AddressSet storage set, address value) internal 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(AddressSet storage set, address value) internal 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.



            address 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(AddressSet storage set, address value) internal view returns (bool) {

        return set._indexes[value] != 0;

    }



    /**

     * @dev Returns the number of values on the set. O(1).

     */

    function length(AddressSet storage set) internal 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(AddressSet storage set, uint256 index) internal view returns (address) {

        require(set._values.length > index, "EnumerableSet: index out of bounds");

        return set._values[index];

    }

}


// File: contracts/StakingBIC.sol


pragma solidity ^0.8.0;


interface IBEP20 {
    function transfer(address recipient, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    function mint(address user, uint256 amount) external;
    function balanceOf(address account) external view returns (uint256);
}
abstract contract Ownable {
    address internal _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
/*  we use proxy, so owner will be set in initialize() function
    constructor () {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), msg.sender);
    }
*/
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

contract Staking is Ownable {
    using EnumerableSet for EnumerableSet.AddressSet;

    address public token;   // BIC token
    EnumerableSet.AddressSet usersList; // list of users with stake

    struct User {
        uint256 amount; // amount of deposit
        uint256 weightedTokens; // the user's weighted tokens balance. (weighted tokens = token amount * staked days)
        uint256 previousWeightedTokens;  // the user's weighted tokens balance for previous month.
        uint256 reward; // amount of reward that user may withdraw before ends of staking.
        uint64 unlockTime;   // when can be unstake
        uint64 updated;    // day when updated
        uint64 multiplier; // multiplier (with 2 decimals) applied to deposit ([0.25 .. 1])
        uint8 status;   // 0 - active, 1 - ended (weightedTokens > 0), 2 - ended (previousWeightedTokens > 0), 3 - ended, but not withdrawn
    }

    mapping(address => User[]) public users;  // users deposits array
    mapping(uint256 => uint256) public multiplier;      // staking days => multiplier (with 2 decimals)

    uint256 public withdrawWindow; // user may withdraw during this time when previous lock period ends.
    uint256 public prolongate;    // if user did not withdraw, money locked on next 30 days.
    uint256 public minimumAmount;   // minimum amount for staking

    // for TEST
    /*
    uint256 public withdrawWindow = 1 days; // user may withdraw during this time when previous lock period ends.
    uint256 public prolongate = 2 days;    // if user user did not withdraw, money locked on next 30 days.
    uint256 public minimumAmount = 1;   // minimum amount for staking
    */
    
    uint256 public totalStaked;
    uint256 public totalStakedWeight;
    uint256 public previousTotalStakedWeight;   // the total staked weight for previous month.
    int256  public amountPerWeightedToken;      // amount (with 18 decimals) of profit/loss per weighted token for previous month.
    int256  public monthResultAmount;  // result for previous month
    uint256 public processingStep; // 0 - processing complete, 1 - recalculate Weight, 2 - split result
    uint256 public processedDay;    // last day that was processed
    uint256 public precessedMonth;  // month when profit/loss was added. Admin can add profit/loss only once per month.
    uint256 public nextProcessUser;

    mapping (address => bool) public admins;
    event SetAdmin(address admin, bool isActive);
    event Stake(address user, uint256 amount, uint256 period, uint256 multiplier);
    event Unstake(address user, uint256 amount);
    event WithdrawUSD(address user, uint256 amount);
    event Processed(uint256 number, uint256 total, uint256 step);
    event RemoveUser(address user);
    event RemoveDeposit(address user, uint256 depositId);
    event MonthResult(int256 amount);
    event SplitResult(address user, uint256 depositId, int256 amount);
    event MonthBalances(uint256 totalStaked, uint256 totalBalance);

    // run only once from proxy
    function initialize(address newOwner, address _token) external {
        require(newOwner != address(0) && _owner == address(0)); // run only once
        _owner = newOwner;
        token = _token;
        emit OwnershipTransferred(address(0), msg.sender);
        withdrawWindow = 5 days; // user may withdraw during this time when previous lock period ends.
        prolongate = 30 days;    // if user did not withdraw, money locked on next 30 days.
        minimumAmount = 200 ether;   // minimum amount for staking
        multiplier[90] = 25;    // staking for 90 days = multiplier 0.25 
        multiplier[180] = 50;    // staking for 180 days = multiplier 0.5 
        multiplier[270] = 75;    // staking for 270 days = multiplier 0.75 
        multiplier[360] = 100;    // staking for 180 days = multiplier 1 
    }
    /**
    * @dev Throws if called by any account other than the admin.
    */
    modifier onlyAdmin() {
        require(admins[msg.sender] || owner() == msg.sender, "Caller is not admin");
        _;
    }

    function setAdmin(address admin, bool isActive) external onlyOwner {
        admins[admin] = isActive;
        emit SetAdmin(admin, isActive);
    }

    // set multiplier (with 2 decimals)
    function setMultiplier(uint256 _days, uint256 _multiplier) external onlyOwner {
        require(_multiplier <= 100, "Wrong multiplier");
        multiplier[_days] = _multiplier;
    }

    // set minimumAmount
    function setMinimumAmount(uint256 _minAmount) external onlyOwner {
        minimumAmount = _minAmount;
    }

    // set withdrawWindow in seconds
    function setWithdrawWindow(uint256 time) external onlyOwner {
        withdrawWindow = time;
    }
    // set prolongate in seconds
    function setProlongate(uint256 time) external onlyOwner {
        prolongate = time;
    }

    // get total number of users
    function getUsersNumber() external view returns(uint256) {
        return usersList.length();
    }

    // get total number of deposits of user
    function getUsersDepositsNumber(address user) external view returns(uint256) {
        return users[user].length;
    }

    // get deposits of user
    function getUsersDeposits(address user) external view returns(User[] memory) {
        return users[user];
    }

    // get deposits of user
    function getUsersDepositsByNumber(uint256 userNumber) external view returns(address, User[] memory) {
        address user = usersList.at(userNumber);
        return (user, users[user]);
    }

    function getTotalBalance() public view returns(uint256 balance) {
        uint256 lastUser = usersList.length();
        for(uint256 precessedUsers = 0; precessedUsers < lastUser; precessedUsers++) {
            address user = usersList.at(precessedUsers);
            uint256 deposits = users[user].length;            
            for (uint256 i = 0; i < deposits; i++) {
                balance += users[user][i].amount;
            }        
        }
    }

    function getTotalStaked() public view returns(uint256 staked) {
        uint256 lastUser = usersList.length();
        for(uint256 precessedUsers = 0; precessedUsers < lastUser; precessedUsers++) {
            address user = usersList.at(precessedUsers);
            uint256 deposits = users[user].length;            
            for (uint256 i = 0; i < deposits; i++) {
                if (users[user][i].status == 0)
                    staked += users[user][i].amount;
            }        
        }
    }
    
    function updateTotalStaked() external onlyAdmin {
        totalStaked = getTotalStaked();
    }

    // Step 0. Call this function 1st day of each month
    // Enter result for previous month
    function monthResult(int256 amount) external onlyOwner {
        require(processingStep == 0, "Previous result was not processed");
        _updateWeight();
        (,uint256 month,) = timestampToDate(block.timestamp);
        //month = block.timestamp / 1 days;  // for TEST
        require(precessedMonth != month, "Result may be added only once per month");
        precessedMonth = month;
        monthResultAmount = amount;
        require (int256(totalStaked) + amount >= 0, "totalStaked less then amount"); 
        if (amount > 0) {
            _safeTransferFrom(token, msg.sender, address(this), uint256(amount));
        }
        processingStep = 1;
        nextProcessUser = 0;
        emit MonthResult(amount);
    }

    // recalculate users weights and total weights to exclude expired staking.
    // Step 1. Call this function 1st day of each month
    // numberUsers - is number of users that will processed at one transaction. Repeat call this function until emit event with number == total.
    function recalculateWeight(uint256 numberUsers) external onlyAdmin {
        require(processingStep == 1, "Wrong step");
        uint256 currentDay = block.timestamp / 1 days;  // number of days that passed
        //uint256 currentDay = block.timestamp / 1 hours;  // for TEST
        uint256 precessedUsers = nextProcessUser;
        uint256 lastUser = usersList.length();
        while (precessedUsers < lastUser) {
            address user = usersList.at(precessedUsers);
            uint256 deposits = users[user].length;
            if (numberUsers >= deposits) {
                numberUsers -= deposits;
            } else {
                nextProcessUser = precessedUsers;
                emit Processed(precessedUsers, lastUser, processingStep);
                return;
            }
            for (uint256 i = 0; i < deposits; i++) {
                _updateUser(currentDay, users[user][i]);
            }        
            precessedUsers++;
        }
        processingStep = 2;
        nextProcessUser = 0;
        emit Processed(precessedUsers, lastUser, 1);

    }
    // call this function 1st day of each month to split month's result among users.
    // numberUsers - is number of users that will processed at one transaction. Repeat call this function until emit event with number == total.
    function splitResult(uint256 numberUsers) external onlyAdmin {
        require(processingStep == 2, "Wrong step");
        int256 _monthResult = monthResultAmount;
        uint256 lastUser = usersList.length();
        if (_monthResult == 0) {    // exit if no amount to split
            processingStep = 0;
            emit Processed(lastUser, lastUser, 2);
            return;
        }
        int256 _previousTotalStakedWeight = int256(previousTotalStakedWeight);
        int256 split;
        uint256 precessedUsers = nextProcessUser;
        while (precessedUsers < lastUser) {
            address user = usersList.at(precessedUsers);
            uint256 deposits = users[user].length;
            if (numberUsers >= deposits) {
                numberUsers -= deposits;
            } else {
                nextProcessUser = precessedUsers;
                totalStaked = uint256(int256(totalStaked) + split); // add to totalStaked split amount
                emit Processed(precessedUsers, lastUser, processingStep);
                return;
            }
            for (uint256 i = 0; i < deposits; i++) {
                int256 wight = int256(users[user][i].previousWeightedTokens);
                if (wight != 0) {
                    int256 stakedAmount = int256(users[user][i].amount);
                    int256 reward = _monthResult * wight * int64(users[user][i].multiplier) / (_previousTotalStakedWeight * 100);
                    split += reward;
                    if (reward > 0) users[user][i].reward += uint256(reward);
                    stakedAmount = stakedAmount + reward;
                    if (stakedAmount < 0) {
                        split = split - stakedAmount;  // unsplit negative values
                        stakedAmount = 0;
                    }
                    users[user][i].amount = uint256(stakedAmount);
                    users[user][i].previousWeightedTokens = 0;
                    emit SplitResult(user, i, reward);                    
                } 
            }        
            precessedUsers++;
        }
        totalStaked = uint256(int256(totalStaked) + split); // add to totalStaked split amount
        processingStep = 0;
        nextProcessUser = 0;
        uint256 bal = IBEP20(token).balanceOf(address(this));
        uint256 totalBalance = getTotalBalance();
        emit MonthBalances(totalStaked, totalBalance);
        if (totalBalance >= totalStaked && bal > totalBalance) // send rest of money to owner
            _safeTransfer(token, owner(), bal - totalBalance);
        emit Processed(precessedUsers, lastUser, 2);
    }

    // allow owner to unstake token's on user behalf without waiting unlock time.
    // user's deposit will be deleted.
    function unstakeAdmin(address user, uint256 depositId, bool withdrawUSD) external onlyOwner {
        uint256 currentDay = _updateWeight();  // number of days that passed
        User storage u = users[user][depositId];
        _updateUser(currentDay, u);
        uint256 totalAmount = u.amount;

        if (totalAmount != 0) {
            if (withdrawUSD) {
                _safeTransfer(token, owner(), totalAmount);
                emit WithdrawUSD(user, totalAmount);
            }
            else {
                _safeTransfer(token, user, totalAmount);
                emit Unstake(user, totalAmount);
            }
        }
        if (u.status == 0) totalStaked -= totalAmount;
        totalStakedWeight -= u.weightedTokens;
        previousTotalStakedWeight -= u.previousWeightedTokens;

        // delete deposit records
        uint256 lastDepositId = users[user].length - 1;
        if (lastDepositId == 0) {
            users[user].pop();  // delete last deposit
            usersList.remove(user); // remove user from list
            emit RemoveUser(user);
        } else {
            if (depositId != lastDepositId) users[user][depositId] = users[user][lastDepositId];
            users[user].pop();
            emit RemoveDeposit(user, depositId);
        }
    }

    // User stake amount of tokens. 
    // User can't withdraw tokens/USD at least 90 days after first deposit or 30 days after further deposits
    function stake(uint256 amount, uint256 period) external {
        require(amount >= minimumAmount, "Staked amount is less then minimum");
        uint256 mp = multiplier[period];
        require(mp != 0, "Wrong period");
        _safeTransferFrom(token, msg.sender, address(this), amount);
        _stake(msg.sender, amount, period, mp);
    }

    // Owner stake amount of tokens on user behalf. 
    // user - address of user's wallet
    // amount - amount of token to transfer on stake
    // period - number of days when tokens will be locked on stake
    // multiplier_ - multiplier (with 2 decimals) applied to deposit ([0.25 .. 1]). I.e. 25 means 0.25
    function stakeBehalf(address user, uint256 amount, uint256 period, uint256 multiplier_) external onlyOwner {
        require(multiplier_ <= 100, "Wrong multiplier");
        _safeTransferFrom(token, msg.sender, address(this), amount);
        _stake(user, amount, period, multiplier_);
    }

    // Withdraw rewards during allowed window.
    function withdrawRewards(uint256 depositId, uint256 amount, bool withdrawUSD) external {
        User storage u = users[msg.sender][depositId];
        uint256 unlockTime = u.unlockTime;
        if (block.timestamp < unlockTime) {
            uint256 _days = unlockTime - block.timestamp;
            _days = _days % prolongate; 
            require(_days > prolongate - withdrawWindow || _days == 0, "Out of withdraw window");
            uint256 reward = u.reward;
            require(amount <= reward && amount <= u.amount, "Not enough rewards");
            uint256 currentDay = _updateWeight();  // number of days that passed
            _updateUser(currentDay, u);
            u.reward = reward - amount;
            u.amount -= amount;
            if (u.status == 0) totalStaked -= amount;
            if (withdrawUSD) {
                _safeTransfer(token, owner(), amount);
                emit WithdrawUSD(msg.sender, amount);
            }
            else {
                _safeTransfer(token, msg.sender, amount);
                emit Unstake(msg.sender, amount);
            }            
        } else {
            _unstake(msg.sender, depositId, withdrawUSD);
        }
    }

    // unstake tokens to user wallet or withdraw USD (tokens will be send to owner())
    // User can't unstake/withdraw at least 90 days after first deposit or 30 days after further deposits
    function unstake(uint256 depositId, bool withdrawUSD) external {
        require(block.timestamp >= users[msg.sender][depositId].unlockTime, "Account locked");
        _unstake(msg.sender, depositId, withdrawUSD);
    }

    // Stake amount for selected period (in days)
    function _stake(address user, uint256 amount, uint256 period, uint256 multiplier_) internal {
        _updateWeight();
        require(users[user].length < 10, "Allowed 10 deposits per wallet");
        totalStaked += amount;
        usersList.add(user);
        users[user].push(
            User({
                amount: amount, 
                weightedTokens: 0,
                previousWeightedTokens: 0,
                reward: 0,
                unlockTime: uint64(block.timestamp + (period * 1 days)),
                updated: uint64(block.timestamp / 1 days),
                //unlockTime: uint64(block.timestamp + (period * 1 hours)), // for TEST
                //updated: uint64(block.timestamp / 1 hours), // for TEST
                multiplier: uint64(multiplier_),
                status: 0
            })
        );
        emit Stake(user, amount, period, multiplier_);
    }

    function _unstake(address user, uint256 depositId, bool withdrawUSD) internal {
        uint256 currentDay = _updateWeight();  // number of days that passed
        User storage u = users[user][depositId];
        _updateUser(currentDay, u);
        uint256 totalAmount = u.amount;
        u.amount = 0;
        u.reward = 0;
        if (totalAmount != 0) {
            if (withdrawUSD) {
                _safeTransfer(token, owner(), totalAmount);
                emit WithdrawUSD(user, totalAmount);
            }
            else {
                _safeTransfer(token, user, totalAmount);
                emit Unstake(user, totalAmount);
            }
        }

        if(u.previousWeightedTokens == 0 && u.weightedTokens == 0) {
            // delete deposit records
            uint256 lastDepositId = users[user].length - 1;
            if (lastDepositId == 0) {
                users[user].pop();  // delete last deposit
                usersList.remove(user); // remove user from list
                emit RemoveUser(user);
            } else {
                if (depositId != lastDepositId) users[user][depositId] = users[user][lastDepositId];
                users[user].pop();
                emit RemoveDeposit(user, depositId);
            }
        }
    }

    function _updateUser(uint256 currentDay, User storage u) internal {
        uint8 status = u.status;   // 0 - active, 1 - ended (weightedTokens > 0), 2 - ended (previousWeightedTokens > 0), 3 - ended, but not withdrawn
        if (status == 0) {
            uint256 amount = u.amount;
            uint256 weightedTokens = u.weightedTokens;
            uint256 unlockDay = u.unlockTime / 1 days;
            if (unlockDay <= currentDay) {
                // Stacking ends. 
                (uint256 previousStakedWeight, uint256 stakedWeight) = 
                    _calculateWeight(unlockDay, u.updated, amount, weightedTokens);
                u.updated = uint64(currentDay);
                u.weightedTokens = stakedWeight;
                if (previousStakedWeight != 0)
                    u.previousWeightedTokens = previousStakedWeight;
                if(stakedWeight != 0) {
                    u.status = 1;       // no active staked amount
                } else if (previousStakedWeight != 0) {
                    u.status = 2;
                } else {
                    u.status = 3;
                }
                totalStaked -= amount;
                // Fix previous weight.
                (previousStakedWeight, stakedWeight) = 
                    _calculateWeight(currentDay, unlockDay, amount, u.weightedTokens);
                totalStakedWeight -= stakedWeight;
                if (previousStakedWeight != 0)
                    previousTotalStakedWeight -= previousStakedWeight;
            } else {
                (uint256 previousStakedWeight, uint256 stakedWeight) = 
                    _calculateWeight(currentDay, u.updated, amount, weightedTokens);
                u.updated = uint64(currentDay);
                u.weightedTokens = stakedWeight;
                if (previousStakedWeight != 0)
                    u.previousWeightedTokens = previousStakedWeight;
            }
        } else if (status == 1 && u.updated < currentDay && u.previousWeightedTokens == 0) {
            u.previousWeightedTokens = u.weightedTokens;
            u.weightedTokens = 0;
            if (u.previousWeightedTokens != 0) {
                u.status = 2;
            } else {
                u.status = 3;
            }
        }
    }

    function _updateWeight() internal returns(uint256 currentDay) {
        currentDay = block.timestamp / 1 days;  // number of days that passed
        //currentDay = block.timestamp / 1 hours;  // for TEST
        if (currentDay > processedDay) {
            (uint256 previousStakedWeight, uint256 stakedWeight) = 
                _calculateWeight(currentDay, processedDay, totalStaked, totalStakedWeight);
            processedDay = currentDay;
            totalStakedWeight = stakedWeight;
            if (previousStakedWeight != 0)
                previousTotalStakedWeight = previousStakedWeight;
        }
    }

    function _calculateWeight(uint256 currentDay, uint256 lastUpdate, uint256 amount, uint256 currentStakedWeight) internal pure returns(uint256 previousStakedWeight, uint256 stakedWeight) {
        stakedWeight = currentStakedWeight;
        if (currentDay > lastUpdate) {
            uint256 interval = currentDay - lastUpdate;
            (,,uint day) = _daysToDate(currentDay);
            
            if (day <= interval) {  // new month starts
                uint256 previousInterval = interval - day + 1;
                previousStakedWeight = currentStakedWeight + (amount * previousInterval);
                interval = interval - previousInterval; // number of days passed in current month
                stakedWeight = amount * interval;  // start total staked weight from zero
            }
            else {
                stakedWeight = currentStakedWeight + (amount * interval);
            }
        }        
    }

// TEST ========================================================================================================
/*
    function TEST_calculateWeight(uint256 currentDay, uint256 lastUpdate, uint256 amount, uint256 currentStakedWeight) public pure returns(uint256 previousStakedWeight, uint256 stakedWeight) {
        stakedWeight = currentStakedWeight;
        if (currentDay > lastUpdate) {
            uint256 interval = currentDay - lastUpdate;
            uint day = (currentDay % 24) + 1;   // 1 hour = 1 day, 24 hours = 1 month
            
            if (day <= interval) {  // new month starts
                uint256 previousInterval = interval - day + 1;
                previousStakedWeight = currentStakedWeight + (amount * previousInterval);
                interval = interval - previousInterval; // number of days passed in current month
                stakedWeight = amount * interval;  // start total staked weight from zero
            }
            else {
                stakedWeight = currentStakedWeight + (amount * interval);
            }
        }        
    }
*/
// END TEST ====================================================================================================

    function _safeTransfer(address _token, address to, uint value) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = _token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
    }

    function _safeTransferFrom(address _token, address from, address to, uint value) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = _token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FROM_FAILED');
    }

    /**
     * @dev Calculate number of days from 1/1/1970 to selected date.
     * @param year The year number
     * @param month The month number
     * @param day The day number
     * @return _days number of day.
     */
    function _daysFromDate(uint year, uint month, uint day) internal pure returns (uint _days) {
        require(year >= 1970);
        int _year = int(year);
        int _month = int(month);
        int _day = int(day);

        int __days = _day
          - 32075
          + 1461 * (_year + 4800 + (_month - 14) / 12) / 4
          + 367 * (_month - 2 - (_month - 14) / 12 * 12) / 12
          - 3 * ((_year + 4900 + (_month - 14) / 12) / 100) / 4
          - 2440588;

        _days = uint(__days);
    }

    /**
     * @dev Calculate timestamp (UNIX time) of selected date and time.
     * @param year The year number
     * @param month The month number
     * @param day The day number
     * @param hour number of hours
     * @param minute number of minutes
     * @param second number of seconds
     * @return timestamp UNIX time
     */
    function timestampFromDateTime(uint year, uint month, uint day, uint hour, uint minute, uint second) internal pure returns (uint timestamp) {
        timestamp = _daysFromDate(year, month, day) * 86400 + hour * 3600 + minute * 60 + second;
    }

    function _daysToDate(uint _days) internal pure returns (uint year, uint month, uint day) {
        int __days = int(_days);

        int L = __days + 68569 + 2440588;
        int N = 4 * L / 146097;
        L = L - (146097 * N + 3) / 4;
        int _year = 4000 * (L + 1) / 1461001;
        L = L - 1461 * _year / 4 + 31;
        int _month = 80 * L / 2447;
        int _day = L - 2447 * _month / 80;
        L = _month / 11;
        _month = _month + 2 - 12 * L;
        _year = 100 * (N - 49) + _year + L;

        year = uint(_year);
        month = uint(_month);
        day = uint(_day);
    }

    /**
     * @dev Calculate date from timestamp (UNIX time) .
     * @param timestamp UNIX time
     * @return year The year number
     * @return month The month number
     * @return day The day number
     */
    function timestampToDate(uint timestamp) internal pure returns (uint year, uint month, uint day) {
        (year, month, day) = _daysToDate(timestamp / 86400);
    }
}

Contract ABI

[{"type":"event","name":"MonthBalances","inputs":[{"type":"uint256","name":"totalStaked","internalType":"uint256","indexed":false},{"type":"uint256","name":"totalBalance","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"MonthResult","inputs":[{"type":"int256","name":"amount","internalType":"int256","indexed":false}],"anonymous":false},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"Processed","inputs":[{"type":"uint256","name":"number","internalType":"uint256","indexed":false},{"type":"uint256","name":"total","internalType":"uint256","indexed":false},{"type":"uint256","name":"step","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"RemoveDeposit","inputs":[{"type":"address","name":"user","internalType":"address","indexed":false},{"type":"uint256","name":"depositId","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"RemoveUser","inputs":[{"type":"address","name":"user","internalType":"address","indexed":false}],"anonymous":false},{"type":"event","name":"SetAdmin","inputs":[{"type":"address","name":"admin","internalType":"address","indexed":false},{"type":"bool","name":"isActive","internalType":"bool","indexed":false}],"anonymous":false},{"type":"event","name":"SplitResult","inputs":[{"type":"address","name":"user","internalType":"address","indexed":false},{"type":"uint256","name":"depositId","internalType":"uint256","indexed":false},{"type":"int256","name":"amount","internalType":"int256","indexed":false}],"anonymous":false},{"type":"event","name":"Stake","inputs":[{"type":"address","name":"user","internalType":"address","indexed":false},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false},{"type":"uint256","name":"period","internalType":"uint256","indexed":false},{"type":"uint256","name":"multiplier","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"Unstake","inputs":[{"type":"address","name":"user","internalType":"address","indexed":false},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"WithdrawUSD","inputs":[{"type":"address","name":"user","internalType":"address","indexed":false},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"admins","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"int256","name":"","internalType":"int256"}],"name":"amountPerWeightedToken","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"balance","internalType":"uint256"}],"name":"getTotalBalance","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"staked","internalType":"uint256"}],"name":"getTotalStaked","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"tuple[]","name":"","internalType":"struct Staking.User[]","components":[{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"uint256","name":"weightedTokens","internalType":"uint256"},{"type":"uint256","name":"previousWeightedTokens","internalType":"uint256"},{"type":"uint256","name":"reward","internalType":"uint256"},{"type":"uint64","name":"unlockTime","internalType":"uint64"},{"type":"uint64","name":"updated","internalType":"uint64"},{"type":"uint64","name":"multiplier","internalType":"uint64"},{"type":"uint8","name":"status","internalType":"uint8"}]}],"name":"getUsersDeposits","inputs":[{"type":"address","name":"user","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"},{"type":"tuple[]","name":"","internalType":"struct Staking.User[]","components":[{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"uint256","name":"weightedTokens","internalType":"uint256"},{"type":"uint256","name":"previousWeightedTokens","internalType":"uint256"},{"type":"uint256","name":"reward","internalType":"uint256"},{"type":"uint64","name":"unlockTime","internalType":"uint64"},{"type":"uint64","name":"updated","internalType":"uint64"},{"type":"uint64","name":"multiplier","internalType":"uint64"},{"type":"uint8","name":"status","internalType":"uint8"}]}],"name":"getUsersDepositsByNumber","inputs":[{"type":"uint256","name":"userNumber","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"getUsersDepositsNumber","inputs":[{"type":"address","name":"user","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"getUsersNumber","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"initialize","inputs":[{"type":"address","name":"newOwner","internalType":"address"},{"type":"address","name":"_token","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"minimumAmount","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"monthResult","inputs":[{"type":"int256","name":"amount","internalType":"int256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"int256","name":"","internalType":"int256"}],"name":"monthResultAmount","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"multiplier","inputs":[{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"nextProcessUser","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"precessedMonth","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"previousTotalStakedWeight","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"processedDay","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"processingStep","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"prolongate","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"recalculateWeight","inputs":[{"type":"uint256","name":"numberUsers","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setAdmin","inputs":[{"type":"address","name":"admin","internalType":"address"},{"type":"bool","name":"isActive","internalType":"bool"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setMinimumAmount","inputs":[{"type":"uint256","name":"_minAmount","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setMultiplier","inputs":[{"type":"uint256","name":"_days","internalType":"uint256"},{"type":"uint256","name":"_multiplier","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setProlongate","inputs":[{"type":"uint256","name":"time","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setWithdrawWindow","inputs":[{"type":"uint256","name":"time","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"splitResult","inputs":[{"type":"uint256","name":"numberUsers","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"stake","inputs":[{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"uint256","name":"period","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"stakeBehalf","inputs":[{"type":"address","name":"user","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"uint256","name":"period","internalType":"uint256"},{"type":"uint256","name":"multiplier_","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"token","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalStaked","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalStakedWeight","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"unstake","inputs":[{"type":"uint256","name":"depositId","internalType":"uint256"},{"type":"bool","name":"withdrawUSD","internalType":"bool"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"unstakeAdmin","inputs":[{"type":"address","name":"user","internalType":"address"},{"type":"uint256","name":"depositId","internalType":"uint256"},{"type":"bool","name":"withdrawUSD","internalType":"bool"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updateTotalStaked","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"uint256","name":"weightedTokens","internalType":"uint256"},{"type":"uint256","name":"previousWeightedTokens","internalType":"uint256"},{"type":"uint256","name":"reward","internalType":"uint256"},{"type":"uint64","name":"unlockTime","internalType":"uint64"},{"type":"uint64","name":"updated","internalType":"uint64"},{"type":"uint64","name":"multiplier","internalType":"uint64"},{"type":"uint8","name":"status","internalType":"uint8"}],"name":"users","inputs":[{"type":"address","name":"","internalType":"address"},{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"withdrawRewards","inputs":[{"type":"uint256","name":"depositId","internalType":"uint256"},{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"bool","name":"withdrawUSD","internalType":"bool"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"withdrawWindow","inputs":[]}]

Contract Creation Code

Verify & Publish

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