// File: contracts/RockHarness.sol



// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.4;

// This is a revised version of the original EtherRock contract 0x37504ae0282f5f334ed29b4548646f887977b7cc with all the rock owners and rock properties the same at the time this new contract is being deployed.
// The original contract at 0x37504ae0282f5f334ed29b4548646f887977b7cc had a simple mistake in the buyRock() function. The line:
// require(rocks[rockNumber].currentlyForSale = true);
// Had to have double equals, as follows:
// require(rocks[rockNumber].currentlyForSale == true);
// Therefore in the original contract, anyone could buy anyone elses rock for the same price the owner purchased it for (regardless of whether the owner chose to sell it or not)

import "@openzeppelin/contracts/access/Ownable.sol";

contract EtherRock is Ownable {
    bool public rockIsForSale = false;
    uint256 public sellableRockNumber = 69;
    uint256 public sellableRockPriceGwei = 2;

    constructor() {}

    function getRockInfo(uint256 rockNumber)
        public
        returns (
            address,
            bool,
            uint256,
            uint256
        )
    {
        if (rockNumber == sellableRockNumber) {
            return (address(0), rockIsForSale, sellableRockPriceGwei, 0);
        }

        return (address(0), false, 0, 0);
    }

    function buyRock(uint256 rockNumber) public payable {
        require(rockNumber == sellableRockNumber);
        require(rockIsForSale);
        require(msg.value == sellableRockPriceGwei);

        rockIsForSale = false;
    }

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

    function setState(bool isForSale, uint256 price) public onlyOwner {
        rockIsForSale = isForSale;
        sellableRockPriceGwei = price;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}