Cryo Explorer Ethereum Mainnet

pragma solidity ^0.8.22;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract MarsStake {
    address public lmc;

    struct User {
        uint256 stake;
        uint256 init;
    }

    mapping(address => User) public users;

    address[] public userAddresses;

    constructor() {
        //test
        // lmc = 0x5195b2709770180903b7aCB3841B081Ec7b6DfFf;
        //main
        lmc = 0x8983CF891867942d06AD6CEb9B9002de860E202d;
    }

    function getUserAddressesLength() external view returns (uint256) {
        return userAddresses.length;
    }

    function stake(uint256 amount) external {
        User storage user = users[msg.sender];
        if (user.init == 0) {
            userAddresses.push(msg.sender);
        }
        IERC20(lmc).transferFrom(msg.sender, address(this), amount);
        user.stake += amount;
        user.init = 1;
    }

    function unstake(uint256 amount) external {
        User storage user = users[msg.sender];
        require(user.stake >= amount, "Insufficient balance");
        IERC20(lmc).transfer(msg.sender, amount);
        user.stake -= amount;
    }

    function getPendingPoint(address addr) external view returns (uint256) {
        User memory user = users[addr];
        uint256 stakeUint = user.stake / 360 ether;
        return stakeUint * 1000;
    }
}

// SPDX-License-Identifier: MIT
// 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);
}