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contracts...2022-04-07_AirGrabbable.sol

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

contract PooNami is ERC20 {
    constructor() ERC20('PooNami', 'POO') {
        _mint(msg.sender, 1e24);
    }
}

contract AirGrap {

    event GrabCreated(Grab, address indexed sender);
    event GrabClaimed(uint256 indexed grabId, address indexed sender);

    struct Grab {
        IERC20 token;
        uint256 totalAmount;
        uint256 amountPerGrab;
        uint256 totalGrabsPossible;
        uint256 currentGrabCount;
    }

    Grab[] private _grabs;
    // grabId => walletAddress => hasGrabbed
    mapping(uint256 => mapping(address => bool)) public hasGrabbed;

    function getGrab(uint256 grabId) external view returns (Grab memory) {
        return _grabs[grabId];
    }

    // deposit an amount of a token, and how much per user someone can grab
    function depositToken(IERC20 token, uint256 totalAmount, uint256 totalGrabsPossible) external returns (uint256 grabId) {

        require(totalGrabsPossible > 0, 'No grabs specified');

        uint256 amountPerGrab = totalAmount / totalGrabsPossible;
        
        require(amountPerGrab > 0, 'Requires amount per grab more than 0');

        // transfer token to this contract
        token.transferFrom(msg.sender, address(this), totalAmount);

        grabId = _grabs.length;

        Grab memory grab = Grab(
            token,
            totalAmount,
            amountPerGrab,
            totalGrabsPossible,
            0
        );

        // save the grab as a new grab
        _grabs.push(grab);

        emit GrabCreated(grab, msg.sender);
    }


    // claim function -> receive x tokens 
    function claim(uint256 grabId) external {
        // make sure that the grab id exists
        require(grabId < _grabs.length, 'Invalid grab id');
        // only allow one grab per wallet
        require(!hasGrabbed[grabId][msg.sender], 'You have already grabbed');
        // only allow so many grabs
        require(_grabs[grabId].currentGrabCount < _grabs[grabId].totalGrabsPossible, 'No more grabs to be claimed');

        _grabs[grabId].token.transfer(msg.sender, _grabs[grabId].amountPerGrab);

        // makes sure they cannot do it again
        hasGrabbed[grabId][msg.sender] = true;
        _grabs[grabId].currentGrabCount++;

        emit GrabClaimed(grabId, msg.sender);
    }
}