Balazs_Homework_1/product_reviews_contract.sol

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.0;

contract productReviews {
    struct Review {
        uint reviewId;
        uint productId;
        string description;
        uint rating;
        address reviewer;
    }

    uint public reviewId = 1;
    Review[] public reviews;

    function addReview(uint _productId, string memory _description, uint _rating) external returns (bool) {
        require(_isRatingOk(_rating) == true);
        reviews.push(Review(reviewId, _productId, _description, _rating, msg.sender));
        reviewId++;
        return true;
    }

    function _isRatingOk(uint _rating) internal pure returns (bool) {
        require(_rating < 6 && _rating > 0);
        return true;
    }

    function isOwner(uint _reviewId) public view returns (bool) {
        require(msg.sender == reviews[_reviewId].reviewer);
        return true;
    }

    function _deleteReview(uint _reviewId) private {
        require(isOwner(_reviewId) == true);
        delete reviews[_reviewId];
    }
}