Contract Source Code:

// SPDX-License-Identifier: MIT License


pragma solidity ^0.8.11;

import "@openzeppelin/contracts/security/ReentrancyGuard.sol";


interface iSabi {
    function balanceOf(address address_) external view returns (uint); 
    function transferFrom(address from_, address to_, uint amount) external returns (bool);
    function burnFrom(address account, uint amount) external;
}

contract WLMarketplace is ReentrancyGuard {

    address public owner;
    
    uint256 public ticketPrice = 1000000000000000000; // 1ETH
    
    /* NEW mapping */
    struct SaleItem {
        uint16 totalSlots;
        uint16 boughtSlots;
        bool isActive;
        uint256 itemPrice;
        address[] buyers;
    }
    mapping (uint => SaleItem) public idToSaleItem;
    // mapping (address => uint) public lastBuyTime;
    //

    constructor() {
        owner = msg.sender;
    }

    address public sabiAddress;
    iSabi public Sabi;
    function setSabi(address _address) external onlyOwner {
        sabiAddress = _address;
        Sabi = iSabi(_address);
    }

    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }


    /*  ======================
        |---Entry Function---|
        ======================
    */

    function buyWL(uint _id) public nonReentrant {
        // used to have payable word in function sig
        require(idToSaleItem[_id].isActive == true, "sale ended");

        require(Sabi.balanceOf(msg.sender) >= idToSaleItem[_id].itemPrice, "insufficent $SABI");
        // require(lastBuyTime[msg.sender] + 1 hours < block.timestamp, "last buy time is less than 72 hours");
        require(idToSaleItem[_id].boughtSlots < idToSaleItem[_id].totalSlots, "slots filled for saleItem");
        for (uint i=0; i<idToSaleItem[_id].buyers.length; i++) {
            require(idToSaleItem[_id].buyers[i] != msg.sender, "already bought from item");           
        }
        // lastBuyTime[msg.sender] = block.timestamp;
        idToSaleItem[_id].boughtSlots++;
        idToSaleItem[_id].buyers.push(msg.sender);
        Sabi.burnFrom(msg.sender, idToSaleItem[_id].itemPrice);
    }

    /*  ======================
        |---View Functions---|
        ======================
    */

    //HELPERS
    // function getLastBuyTimePlus72Hours(address _buyer) public view returns (uint) {
    //     return lastBuyTime[_buyer] + 1 hours;
    // }

    function buyersOfSaleItem(uint16 _id) public view returns (address[] memory) {
        return idToSaleItem[_id].buyers;
    }


    /*  ============================
        |---Owner Only Functions---|
        ============================
    */

    

    function createSaleItem(uint256 _newTicketPrice, uint16 _newId, uint16 _totalSlots) public onlyOwner {
        // ticketPrice = _newTicketPrice;

        idToSaleItem[_newId].totalSlots = _totalSlots;
        idToSaleItem[_newId].boughtSlots = 0;
        idToSaleItem[_newId].isActive = true;
        idToSaleItem[_newId].itemPrice = _newTicketPrice * ticketPrice;
        // idToSaleItem[_newId].buyers = address[]

    }

    function disableSaleItem(uint16 _newId) public onlyOwner {

        idToSaleItem[_newId].isActive = false;

    }



    function setTicketPrice(uint256 _newTicketPrice) public onlyOwner {
        ticketPrice = _newTicketPrice;
    }

    function transferOwnership(address _address) public onlyOwner {
        owner = _address;
    }

    function withdraw() public payable onlyOwner {
        payable(msg.sender).transfer(address(this).balance);
    }

}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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