Contract Address Details

// SPDX-License-Identifier: MIT


// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity 0.8.20;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol


// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}



/*
https://t.me/OAT_PL

//Experimental Proof of concept.  

//Tokens can be locked in the RewardSystem Contract for Minted Rewards

//Nodes can potentially be used as a fill-in Oracle Price feed on Networks not supported by Large Oracle Projects 

//Use at your own risk


*/




contract RewardSystem is ReentrancyGuard {
    IERC20 public token;
    mapping(address => uint256) public lockedBalances;
    mapping(address => uint256) public lastLockedTime;
    address[] public stakers;
    uint256 public totalLocked;

    address constant BURN_ADDRESS = 0x0000000000000000000000000000000000000369; // Burn address
    uint256 public constant LOCK_PERIOD = 14 days; // 14-day lock period for unlocking tokens

    event Locked(address indexed user, uint256 amount);
    event Unlocked(address indexed user, uint256 amount);
    event RewardDistributed(address indexed staker, uint256 reward);
    event RewardsBurned(uint256 amount);

    constructor(address _token) {
        token = IERC20(_token);
    }

    function lockTokens(uint256 amount) external nonReentrant {
        require(token.transferFrom(msg.sender, address(this), amount), "Transfer failed");
        if (lockedBalances[msg.sender] == 0) {
            stakers.push(msg.sender); // Add to stakers array if not already a staker
        }
        lockedBalances[msg.sender] += amount;
        totalLocked += amount;
        lastLockedTime[msg.sender] = block.timestamp; // Update the last locked time
        emit Locked(msg.sender, amount);
    }

    function unlockTokens() external nonReentrant {
        require(block.timestamp >= lastLockedTime[msg.sender] + LOCK_PERIOD, "Tokens are locked, cannot unlock yet");
        uint256 balance = lockedBalances[msg.sender];
        require(balance > 0, "No tokens locked");
        require(token.transfer(msg.sender, balance), "Transfer failed");

        totalLocked -= balance;
        lockedBalances[msg.sender] = 0;
        removeStaker(msg.sender); // Remove from stakers list
        emit Unlocked(msg.sender, balance);
    }

    function distributeRewards(uint256 rewardAmount) external nonReentrant {
        if (totalLocked == 0) {
            token.transfer(BURN_ADDRESS, rewardAmount);
            emit RewardsBurned(rewardAmount);
            return;
        }

        for (uint i = 0; i < stakers.length; i++) {
            address staker = stakers[i];
            uint256 balance = lockedBalances[staker];
            if (balance > 0) {
                uint256 reward = (balance * rewardAmount) / totalLocked;
                token.transfer(staker, reward);
                emit RewardDistributed(staker, reward);
            }
        }
    }

    function removeStaker(address staker) private {
        for (uint i = 0; i < stakers.length; i++) {
            if (stakers[i] == staker) {
                stakers[i] = stakers[stakers.length - 1];
                stakers.pop();
                break;
            }
        }
    }
}