// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import { ReentrancyErrors } from "../interfaces/ReentrancyErrors.sol";

import "./ConsiderationConstants.sol";

/**
 * @title ReentrancyGuard
 * @author 0age
 * @notice ReentrancyGuard contains a storage variable and related functionality
 *         for protecting against reentrancy.
 */
contract ReentrancyGuard is ReentrancyErrors {
    // Prevent reentrant calls on protected functions.
    uint256 private _reentrancyGuard;

    /**
     * @dev Initialize the reentrancy guard during deployment.
     */
    constructor() {
        // Initialize the reentrancy guard in a cleared state.
        _reentrancyGuard = _NOT_ENTERED;
    }

    /**
     * @dev Internal function to ensure that the sentinel value for the
     *      reentrancy guard is not currently set and, if not, to set the
     *      sentinel value for the reentrancy guard.
     */
    function _setReentrancyGuard() internal {
        // Ensure that the reentrancy guard is not already set.
        _assertNonReentrant();

        // Set the reentrancy guard.
        _reentrancyGuard = _ENTERED;
    }

    /**
     * @dev Internal function to unset the reentrancy guard sentinel value.
     */
    function _clearReentrancyGuard() internal {
        // Clear the reentrancy guard.
        _reentrancyGuard = _NOT_ENTERED;
    }

    /**
     * @dev Internal view function to ensure that the sentinel value for the
            reentrancy guard is not currently set.
     */
    function _assertNonReentrant() internal view {
        // Ensure that the reentrancy guard is not currently set.
        if (_reentrancyGuard != _NOT_ENTERED) {
            revert NoReentrantCalls();
        }
    }
}