Contract 0xd666d1CC3102cd03e07794A61E5F4333B4239F53 12

 
Txn Hash Method
Block
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To
Value [Txn Fee]
0x0f7dc2b5c2827695ca273315b37a5b35cc2e1e62ae35cda6f30b473b4eb5a271Set Approval For...1954360822024-03-29 12:35:593 hrs 23 mins ago0x6cf4370cba8119b06119c5f23704b9411eedf2a7 IN  Smolverse: Smol Brains Land0 ETH0.00000529 0.01
0xf8994a2fc66c54d2d70c9f917abb113f370788fdf911d1cd524751d32de09cc6Safe Transfer Fr...1954353982024-03-29 12:33:083 hrs 26 mins ago0x2bb9697dfef7bedf83130bc22f09984e968cd4b7 IN  Smolverse: Smol Brains Land0 ETH0.0000069 0.01
0x0bc80ec39c6202daca8e2dac86ffd9e8ba19b37711811a42e09cfd9b8e79c7aeSet Approval For...1949443192024-03-28 2:16:071 day 13 hrs ago0x9bed55880348b950627185c2a8d142acbdc3823e IN  Smolverse: Smol Brains Land0 ETH0.00000254 0.01
0x49e34cdca290b100d7f28f96ca5c3129eea45b299ee88e845f4a269848fbdff8Set Approval For...1947637012024-03-27 13:39:092 days 2 hrs ago0x371c4cf0efeda222fd6461cd5e4f9d62ac61d78e IN  Smolverse: Smol Brains Land0 ETH0.00000409 0.049662
0x5b56c2a43473b3a42e97f4bf98c60b970a2cdf05bf517b97d550209f4b3298a2Set Approval For...1946609172024-03-27 6:29:562 days 9 hrs ago0x048b8384152ff75d310a3d7bf50a50fcad3c62ec IN  Smolverse: Smol Brains Land0 ETH0.00000111 0.01
0xba4894085783f315da9a1bf99c8868840f134ffb9dbcd804e875815eac418f15Set Approval For...1946367802024-03-27 4:49:192 days 11 hrs ago0x2bb9697dfef7bedf83130bc22f09984e968cd4b7 IN  Smolverse: Smol Brains Land0 ETH0.00000093 0.01
0x1ffad5ade3026f8df5b1cde7f2863844aa9e89eb68fc3b2e5560388d0d3857acSafe Transfer Fr...1946362562024-03-27 4:47:082 days 11 hrs ago0xcff13d0b7af3450ef9d0198dc7331e567881406b IN  Smolverse: Smol Brains Land0 ETH0.00000167 0.01
0x55cba58a2f6aeb275598fce1506654193807a2d4dfb785375b3f13915b4c1034Set Approval For...1944304192024-03-26 14:26:443 days 1 hr ago0xcff13d0b7af3450ef9d0198dc7331e567881406b IN  Smolverse: Smol Brains Land0 ETH0.00000229 0.012264
0x67575280e16595ed7d7e9cc3878c8f7c00a45160657a514826a84793d84ca5f2Set Approval For...1943599852024-03-26 9:33:203 days 6 hrs ago0x1fbe3ca9bae81ad615f1b90f92c173f855e9abad IN  Smolverse: Smol Brains Land0 ETH0.000001220.01
0xdf4bce98f64e64a8572899dc8e8694f81bf204145104dc2b94ece2acdb1c3c46Set Approval For...1943294912024-03-26 7:26:203 days 8 hrs ago0x048b8384152ff75d310a3d7bf50a50fcad3c62ec IN  Smolverse: Smol Brains Land0 ETH0.00000091 0.01
0xb99a8a4b6de39f56f1d689a658de6b3fcfeced8e13f4feb37687de54193fde96Safe Transfer Fr...1943067782024-03-26 5:51:473 days 10 hrs ago0xe6bc8a27b11ed1f5a2725e7b21273cd3664ebf89 IN  Smolverse: Smol Brains Land0 ETH0.00000161 0.01
0x6e65497fa5aeff3f2ee8539b117fb19c05b13251f3a3cf0b811287ef3c49ae57Set Approval For...1942628452024-03-26 2:48:253 days 13 hrs ago0x383bd7db5de5b24a2bf1d555bf584d2840791d8d IN  Smolverse: Smol Brains Land0 ETH0.00000105 0.01
0xbaab6d16dcd6cd473bcfd69f9b97971d03f1fe79e8190635cd778cff27de2907Set Approval For...1942371512024-03-26 1:01:273 days 14 hrs ago0xa1f8082b4a40a1d3f8d2ef15d598accfffffd671 IN  Smolverse: Smol Brains Land0 ETH0.00000113 0.01
0x9fd3e2833afde5068de333814fea6260c98463e5d5ce72e77ad353828d59bab0Safe Transfer Fr...1942368832024-03-26 1:00:203 days 14 hrs ago0xa1f8082b4a40a1d3f8d2ef15d598accfffffd671 IN  Smolverse: Smol Brains Land0 ETH0.00000189 0.01
0x9e425b6854ea25d30d251bad87e623127ee56780b0924fb356603c7e8b58dc2dSet Approval For...1942295812024-03-26 0:29:543 days 15 hrs ago0x5d082946dadda4ac0259c4eed8dac62de97078fa IN  Smolverse: Smol Brains Land0 ETH0.00000097 0.01
0xec2174c1f62afa857dccd91a2088bf51dbf7c71717c60363b726bacc7e5bc42cSet Approval For...1942044482024-03-25 22:45:113 days 17 hrs ago0x8fff9657df45b0ed0dd20d7dac48da12082b4c60 IN  Smolverse: Smol Brains Land0 ETH0.00000118 0.01
0x691549bb43fbaefba7fd9d24fc18a8c7f6ae0f4a738e94316e4a712f3c5f3f63Set Approval For...1941445662024-03-25 18:35:243 days 21 hrs ago0x5f8945b999943951a2c3a77465137f96fbba8f9f IN  Smolverse: Smol Brains Land0 ETH0.00000174 0.01
0xf6e13a3778e296ac53b16903b136f27980225ae412895f8ec4cbdbcf8f1560e5Set Approval For...1941320292024-03-25 17:43:113 days 22 hrs ago0x6478c54d7e93801950ef4970424d2e84bd1a7ea1 IN  Smolverse: Smol Brains Land0 ETH0.00000133 0.01
0x4008bab368a2ea0046d7aad8a352fe20793ce503d54f6930e19dea287e9af95bSet Approval For...1940769212024-03-25 13:52:584 days 2 hrs ago0xa89eb822c96e44f2342c8b4d1dbb9d5428b2dbb2 IN  Smolverse: Smol Brains Land0 ETH0.00000127 0.01151
0x864861fd71a734e71712c73d7fd2f14c31cc6f6c64f20dc756021085782a7806Set Approval For...1939516192024-03-25 5:10:184 days 10 hrs ago0x5565535d89c28ed18c97e0243d403c818bea8923 IN  Smolverse: Smol Brains Land0 ETH0.00000087 0.01
0x77e381debf3405c3c1cc16c31ca45e5e7e52c82768b34bec1c93109862d49edfSet Approval For...1936735352024-03-24 9:49:065 days 6 hrs ago0xd95f14b01b3167144f64e04dcae8a40a2d5ca952 IN  Smolverse: Smol Brains Land0 ETH0.00000095 0.01
0x62b858af26892e9c28d8c543fac539fdeebc0f09e6edb589fb5168e939c2996dTransfer From1936545892024-03-24 8:30:145 days 7 hrs ago0x5bcef2a758d33561031251a25749000336773a55 IN  Smolverse: Smol Brains Land0 ETH0.00000163 0.01
0x5e3c0fc7dfbdb806f668b43d935d72c61f530c2fb6dcecf802e7b54d7b2797b8Set Approval For...1934751612024-03-23 19:59:405 days 20 hrs ago0x2d05f736cbfef5f1e84b097e09d48575e8995848 IN  Smolverse: Smol Brains Land0 ETH0.00000121 0.01
0xa2d641ab5af9c85d138f99bb7b758d884f54d1f3a4642d32d2d7b56635810ab7Set Approval For...1934659202024-03-23 19:20:575 days 20 hrs ago0x9be5506636024929eb9f47a57a1e1acd78da41ee IN  Smolverse: Smol Brains Land0 ETH0.000001050.01
0x3edf96acece2c16cc1522f9de33620998c7c4f69be204deede6e03c665a158b3Transfer From1932904042024-03-23 7:07:576 days 8 hrs ago0x4f4487daab94108f10b4a9994e0fd83b3b4d9a36 IN  Smolverse: Smol Brains Land0 ETH0.0000018 0.01
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Latest 25 internal transaction
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0x4ab7ed2b8a8fd86032bc243bfd096a9f83b32caa16acc37344d07d226f53933d720748812023-03-21 9:30:11374 days 6 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0x4ab7ed2b8a8fd86032bc243bfd096a9f83b32caa16acc37344d07d226f53933d720748812023-03-21 9:30:11374 days 6 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0x4ab7ed2b8a8fd86032bc243bfd096a9f83b32caa16acc37344d07d226f53933d720748812023-03-21 9:30:11374 days 6 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0x4ab7ed2b8a8fd86032bc243bfd096a9f83b32caa16acc37344d07d226f53933d720748812023-03-21 9:30:11374 days 6 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0x4ab7ed2b8a8fd86032bc243bfd096a9f83b32caa16acc37344d07d226f53933d720748812023-03-21 9:30:11374 days 6 hrs ago Treasure DAO: Trove Marketplace Smolverse: Smol Brains Land0 ETH
0xab534f58c464d7503c1a0e94ac0428204b2ea456797bce3869ccff4467fa10e9720681772023-03-21 9:02:38374 days 6 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0xab534f58c464d7503c1a0e94ac0428204b2ea456797bce3869ccff4467fa10e9720681772023-03-21 9:02:38374 days 6 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0xab534f58c464d7503c1a0e94ac0428204b2ea456797bce3869ccff4467fa10e9720681772023-03-21 9:02:38374 days 6 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0xab534f58c464d7503c1a0e94ac0428204b2ea456797bce3869ccff4467fa10e9720681772023-03-21 9:02:38374 days 6 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0xab534f58c464d7503c1a0e94ac0428204b2ea456797bce3869ccff4467fa10e9720681772023-03-21 9:02:38374 days 6 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0xab534f58c464d7503c1a0e94ac0428204b2ea456797bce3869ccff4467fa10e9720681772023-03-21 9:02:38374 days 6 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0xab534f58c464d7503c1a0e94ac0428204b2ea456797bce3869ccff4467fa10e9720681772023-03-21 9:02:38374 days 6 hrs ago 0xcca920553ccc9aca80919e614325167d9ec37b4a Smolverse: Smol Brains Land0 ETH
0xab534f58c464d7503c1a0e94ac0428204b2ea456797bce3869ccff4467fa10e9720681772023-03-21 9:02:38374 days 6 hrs ago 0xcca920553ccc9aca80919e614325167d9ec37b4a Smolverse: Smol Brains Land0 ETH
0xab534f58c464d7503c1a0e94ac0428204b2ea456797bce3869ccff4467fa10e9720681772023-03-21 9:02:38374 days 6 hrs ago 0xcca920553ccc9aca80919e614325167d9ec37b4a Smolverse: Smol Brains Land0 ETH
0x477861f976dea93998723a3adde9488496f2ba2d02326414ab328356bb2ca048720680882023-03-21 9:02:16374 days 6 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0x477861f976dea93998723a3adde9488496f2ba2d02326414ab328356bb2ca048720680882023-03-21 9:02:16374 days 6 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0x477861f976dea93998723a3adde9488496f2ba2d02326414ab328356bb2ca048720680882023-03-21 9:02:16374 days 6 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0x477861f976dea93998723a3adde9488496f2ba2d02326414ab328356bb2ca048720680882023-03-21 9:02:16374 days 6 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0x477861f976dea93998723a3adde9488496f2ba2d02326414ab328356bb2ca048720680882023-03-21 9:02:16374 days 6 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0x477861f976dea93998723a3adde9488496f2ba2d02326414ab328356bb2ca048720680882023-03-21 9:02:16374 days 6 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0x477861f976dea93998723a3adde9488496f2ba2d02326414ab328356bb2ca048720680882023-03-21 9:02:16374 days 6 hrs ago 0xcca920553ccc9aca80919e614325167d9ec37b4a Smolverse: Smol Brains Land0 ETH
0x477861f976dea93998723a3adde9488496f2ba2d02326414ab328356bb2ca048720680882023-03-21 9:02:16374 days 6 hrs ago 0xcca920553ccc9aca80919e614325167d9ec37b4a Smolverse: Smol Brains Land0 ETH
0x477861f976dea93998723a3adde9488496f2ba2d02326414ab328356bb2ca048720680882023-03-21 9:02:16374 days 6 hrs ago 0xcca920553ccc9aca80919e614325167d9ec37b4a Smolverse: Smol Brains Land0 ETH
0x8c88429bb54ef4fc15eb388e8a853ecfaf485fe727773993ffd5c7c89ddb9380720667902023-03-21 8:57:00374 days 7 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
0x8c88429bb54ef4fc15eb388e8a853ecfaf485fe727773993ffd5c7c89ddb9380720667902023-03-21 8:57:00374 days 7 hrs ago Smolverse: Smol Brains Land Smolverse: Smol Brains0 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
Land

Compiler Version
v0.8.7+commit.e28d00a7

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 20 : Land.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.7;

import '@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol';
import '@openzeppelin/contracts/utils/math/Math.sol';
import '@openzeppelin/contracts/utils/Strings.sol';
import '@openzeppelin/contracts/utils/Counters.sol';
import './SmolBrain.sol';
import "./MinterControl.sol";

contract Land is MinterControl, ERC721Enumerable {
    using Strings for uint256;
    using Counters for Counters.Counter;

    Counters.Counter private _tokenIdTracker;
    string public baseURI;

    /// @dev 18 decimals
    uint256 public landMaxLevel;
    /// @dev 18 decimals
    uint256 public levelIQCost;

    /// @dev tokenId => land level
    mapping(uint256 => uint256) public landLevels;

    SmolBrain public smolBrain;

    event LandMint(address indexed to, uint256 tokenId);
    event LandUpgrade(uint256 indexed tokenId, uint256 availableLevel);
    event LandMaxLevel(uint256 landMaxLevel);
    event LevelIQCost(uint256 levelIQCost);
    event SmolBrainSet(address smolBrain);

    constructor() ERC721("Smol Brain Land", "SmolBrainLand") {}

    function supportsInterface(bytes4 interfaceId) public view override(ERC721Enumerable, AccessControl) returns (bool) {
        return ERC721Enumerable.supportsInterface(interfaceId) || AccessControl.supportsInterface(interfaceId);
    }

    function mint(address _to) external onlyMinter {
        emit LandMint(_to, _tokenIdTracker.current());

        _safeMint(_to, _tokenIdTracker.current());
        _tokenIdTracker.increment();
    }

    function tokenURI(uint256 _tokenId) public view override returns (string memory) {
        require(_exists(_tokenId), "Land: URI query for nonexistent token");

        (, uint256 availableLevel) = canUpgrade(_tokenId);
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, availableLevel.toString())) : "";
    }

    /// @param _tokenId tokenId of the land
    /// @return isUpgradeAvailable true if higher level is available
    /// @return availableLevel what level can land be upgraded to
    function canUpgrade(uint256 _tokenId) public view returns (bool isUpgradeAvailable, uint256 availableLevel) {
        uint256 highestIQ = findBiggestBrainIQ(ownerOf(_tokenId));
        uint256 averageIQ = smolBrain.averageIQ();
        uint256 maxLevel = Math.min(averageIQ / levelIQCost, landMaxLevel);
        availableLevel = Math.min(highestIQ / levelIQCost, maxLevel);
        uint256 storedLevel = landLevels[_tokenId];
        if (storedLevel < availableLevel) {
            isUpgradeAvailable = true;
        }
    }

    /// @param _owner owner of the land
    /// @return highestIQ IQ of the biggest brain
    function findBiggestBrainIQ(address _owner) public view returns (uint256 highestIQ) {
        uint256 length = smolBrain.balanceOf(_owner);

        for (uint256 i = 0; i < length; i++) {
            uint256 tokenId = smolBrain.tokenOfOwnerByIndex(_owner, i);
            uint256 IQ = smolBrain.scanBrain(tokenId);
            if (IQ > highestIQ) {
                highestIQ = IQ;
            }
        }
    }

    /// @param _tokenId tokenId of the land
    function upgrade(uint256 _tokenId) external {
        require(upgradeSafe(_tokenId), "Land: nothing to upgrade");
    }

    function upgradeSafe(uint256 _tokenId) public returns (bool) {
        (bool isUpgradeAvailable, uint256 availableLevel) = canUpgrade(_tokenId);
        if (isUpgradeAvailable) {
            landLevels[_tokenId] = availableLevel;
            emit LandUpgrade(_tokenId, availableLevel);
        }
        return isUpgradeAvailable;
    }

    function _beforeTokenTransfer(
        address _from,
        address _to,
        uint256 _tokenId
    ) internal override {
        super._beforeTokenTransfer(_from, _to, _tokenId);

        require(balanceOf(_to) == 0, "Land: can own only one land");
        if (_from != address(0)) upgradeSafe(_tokenId);
    }

    function _baseURI() internal view override returns (string memory) {
        return baseURI;
    }

    // ADMIN

    function setSmolBrain(address _smolBrain) external onlyOwner {
        smolBrain = SmolBrain(_smolBrain);
        emit SmolBrainSet(_smolBrain);
    }

    function setMaxLevel(uint256 _landMaxLevel) external onlyOwner {
        landMaxLevel = _landMaxLevel;
        emit LandMaxLevel(_landMaxLevel);
    }

    function setLevelIQCost(uint256 _levelIQCost) external onlyOwner {
        levelIQCost = _levelIQCost;
        emit LevelIQCost(_levelIQCost);
    }

    function setBaseURI(string memory _baseURItoSet) external onlyOwner {
        baseURI = _baseURItoSet;
    }
}

File 2 of 20 : ERC721Enumerable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}

File 3 of 20 : Math.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a / b + (a % b == 0 ? 0 : 1);
    }
}

File 4 of 20 : Strings.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

File 5 of 20 : Counters.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

File 6 of 20 : SmolBrain.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.7;

import '@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol';
import '@openzeppelin/contracts/utils/math/Math.sol';
import '@openzeppelin/contracts/utils/Strings.sol';
import '@openzeppelin/contracts/utils/Counters.sol';
import './School.sol';
import './Land.sol';
import "./MinterControl.sol";

contract SmolBrain is MinterControl, ERC721Enumerable {
    using Strings for uint256;
    using Counters for Counters.Counter;

    uint256 constant LAST_MALE = 6710;
    uint256 constant LAST_FEMALE = 13421;

    enum Gender { Male, Female }

    Counters.Counter private _maleTokenIdTracker;
    Counters.Counter private _femaleTokenIdTracker;
    string public baseURI;

    /// @dev 18 decimals
    uint256 public brainMaxLevel;
    /// @dev 18 decimals
    uint256 public levelIQCost;

    School public school;
    Land public land;

    // tokenId => IQ
    mapping(uint256 => uint256) public brainz;

    event SmolBrainMint(address to, uint256 tokenId, Gender gender);
    event LevelIQCost(uint256 levelIQCost);
    event LandMaxLevel(uint256 brainMaxLevel);
    event SchoolSet(address school);
    event LandSet(address land);

    modifier onlySchool() {
        require(msg.sender == address(school), "SmolBrain: !school");
        _;
    }

    constructor(address _luckyWinner) ERC721("Smol Brain", "SmolBrain") {
        _femaleTokenIdTracker._value = LAST_MALE + 1;
        _mint(_luckyWinner, Gender.Male);
    }

    function supportsInterface(bytes4 interfaceId) public view override(ERC721Enumerable, AccessControl) returns (bool) {
        return ERC721Enumerable.supportsInterface(interfaceId) || AccessControl.supportsInterface(interfaceId);
    }

    function mintMale(address _to) external onlyMinter {
        _mint(_to, Gender.Male);
    }

    function mintFemale(address _to) external onlyMinter {
        _mint(_to, Gender.Female);
    }

    function getGender(uint256 _tokenId) public pure returns (Gender) {
        return _tokenId <= LAST_MALE ? Gender.Male : Gender.Female;
    }

    function tokenURI(uint256 _tokenId) public view override returns (string memory) {
        require(_exists(_tokenId), "SmolBrain: URI query for nonexistent token");

        uint256 level = Math.min(scanBrain(_tokenId) / levelIQCost, brainMaxLevel);
        return bytes(baseURI).length > 0 ?
            string(abi.encodePacked(
                baseURI,
                _tokenId.toString(),
                "/",
                level.toString()
            ))
            : "";
    }

    function scanBrain(uint256 _tokenId) public view returns (uint256 IQ) {
        IQ = brainz[_tokenId] + school.iqEarned(_tokenId);
    }

    function averageIQ() public view returns (uint256) {
        if (totalSupply() == 0) return 0;
        uint256 totalIQ = school.totalIQ();
        return totalIQ / totalSupply();
    }

    /// @param _tokenId tokenId of the land
    function schoolDrop(uint256 _tokenId, uint256 _iqEarned) external onlySchool {
        brainz[_tokenId] += _iqEarned;
    }

    function _mint(address _to, Gender _gender) internal {
        uint256 _tokenId;
        if (_gender == Gender.Male) {
            _tokenId = _maleTokenIdTracker.current();
            _maleTokenIdTracker.increment();
            require(_tokenId <= LAST_MALE, "SmolBrain: exceeded tokenId for male");
        } else {
            _tokenId = _femaleTokenIdTracker.current();
            _femaleTokenIdTracker.increment();
            require(_tokenId <= LAST_FEMALE, "SmolBrain: exceeded tokenId for female");
        }

        emit SmolBrainMint(_to, _tokenId, _gender);
        _safeMint(_to, _tokenId);
    }

    function _beforeTokenTransfer(
        address _from,
        address _to,
        uint256 _tokenId
    ) internal override {
        super._beforeTokenTransfer(_from, _to, _tokenId);

        if (address(school) != address(0))
            require(!school.isAtSchool(_tokenId), "SmolBrain: is at school. Drop school to transfer.");
        if (_from != address(0))
            land.upgradeSafe(land.tokenOfOwnerByIndex(_from, 0));
    }

    function _baseURI() internal view override returns (string memory) {
        return baseURI;
    }

    // ADMIN

    function setSchool(address _school) external onlyOwner {
        school = School(_school);
        emit SchoolSet(_school);
    }

    function setLand(address _land) external onlyOwner {
        land = Land(_land);
        emit LandSet(_land);
    }

    function setLevelIQCost(uint256 _levelIQCost) external onlyOwner {
        levelIQCost = _levelIQCost;
        emit LevelIQCost(_levelIQCost);
    }

    function setMaxLevel(uint256 _brainMaxLevel) external onlyOwner {
        brainMaxLevel = _brainMaxLevel;
        emit LandMaxLevel(_brainMaxLevel);
    }

    function setBaseURI(string memory _baseURItoSet) external onlyOwner {
        baseURI = _baseURItoSet;
    }
}

File 7 of 20 : MinterControl.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.7;

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

abstract contract MinterControl is AccessControl {
    bytes32 public constant SMOLBRAIN_OWNER_ROLE = keccak256("SMOLBRAIN_OWNER_ROLE");
    bytes32 public constant SMOLBRAIN_MINTER_ROLE = keccak256("SMOLBRAIN_MINTER_ROLE");

    modifier onlyOwner() {
        require(hasRole(SMOLBRAIN_OWNER_ROLE, _msgSender()), "MinterControl: not a SMOLBRAIN_OWNER_ROLE");
        _;
    }

    modifier onlyMinter() {
        require(isMinter(_msgSender()), "MinterControl: not a SMOLBRAIN_MINTER_ROLE");
        _;
    }

    constructor() {
        _setRoleAdmin(SMOLBRAIN_OWNER_ROLE, SMOLBRAIN_OWNER_ROLE);
        _setRoleAdmin(SMOLBRAIN_MINTER_ROLE, SMOLBRAIN_OWNER_ROLE);

        _setupRole(SMOLBRAIN_OWNER_ROLE, _msgSender());
    }

    function grantMinter(address _minter) external {
        grantRole(SMOLBRAIN_MINTER_ROLE, _minter);
    }

    function isMinter(address _minter) public view returns (bool) {
        return hasRole(SMOLBRAIN_MINTER_ROLE, _minter);
    }

    function grantOwner(address _owner) external {
        grantRole(SMOLBRAIN_OWNER_ROLE, _owner);
    }

    function isOwner(address _owner) public view returns (bool) {
        return hasRole(SMOLBRAIN_OWNER_ROLE, _owner);
    }
}

File 8 of 20 : ERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

File 9 of 20 : IERC721Enumerable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

File 10 of 20 : IERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

File 11 of 20 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

File 12 of 20 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

File 13 of 20 : Address.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 14 of 20 : Context.sol
// SPDX-License-Identifier: MIT

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;
    }
}

File 15 of 20 : ERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

File 16 of 20 : IERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

File 17 of 20 : School.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.7;

import '@openzeppelin/contracts/access/Ownable.sol';
import './SmolBrain.sol';

contract School is Ownable {
    uint256 public constant WEEK = 5 minutes;
    /// @dev 18 decimals
    uint256 public iqPerWeek;
    /// @dev 18 decimals
    uint256 public totalIqStored;
    /// @dev unix timestamp
    uint256 public lastRewardTimestamp;
    uint256 public smolBrainSupply;

    SmolBrain public smolBrain;

    mapping(uint256 => uint256) public timestampJoined;

    event JoinSchool(uint256 tokenId);
    event DropSchool(uint256 tokenId);
    event SetIqPerWeek(uint256 iqPerWeek);
    event SmolBrainSet(address smolBrain);

    modifier onlySmolBrainOwner(uint256 _tokenId) {
        require(smolBrain.ownerOf(_tokenId) == msg.sender, "School: only owner can send to school");
        _;
    }

    modifier atSchool(uint256 _tokenId, bool expectedAtSchool) {
        require(isAtSchool(_tokenId) == expectedAtSchool, "School: wrong school attendance");
        _;
    }

    modifier updateTotalIQ(bool isJoining) {
        if (smolBrainSupply > 0) {
            totalIqStored = totalIQ();
        }
        lastRewardTimestamp = block.timestamp;
        isJoining ? smolBrainSupply++ : smolBrainSupply--;
        _;
    }

    function totalIQ() public view returns (uint256) {
        uint256 timeDelta = block.timestamp - lastRewardTimestamp;
        return totalIqStored + smolBrainSupply * iqPerWeek * timeDelta / WEEK;
    }

    function iqEarned(uint256 _tokenId) public view returns (uint256 iq) {
        if (timestampJoined[_tokenId] == 0) return 0;
        uint256 timedelta = block.timestamp - timestampJoined[_tokenId];
        iq = iqPerWeek * timedelta / WEEK;
    }

    function isAtSchool(uint256 _tokenId) public view returns (bool) {
        return timestampJoined[_tokenId] > 0;
    }

    function join(uint256 _tokenId)
        external
        onlySmolBrainOwner(_tokenId)
        atSchool(_tokenId, false)
        updateTotalIQ(true)
    {
        timestampJoined[_tokenId] = block.timestamp;
        emit JoinSchool(_tokenId);
    }

    function drop(uint256 _tokenId)
        external
        onlySmolBrainOwner(_tokenId)
        atSchool(_tokenId, true)
        updateTotalIQ(false)
    {
        smolBrain.schoolDrop(_tokenId, iqEarned(_tokenId));
        timestampJoined[_tokenId] = 0;
        emit DropSchool(_tokenId);
    }

    // ADMIN

    function setSmolBrain(address _smolBrain) external onlyOwner {
        smolBrain = SmolBrain(_smolBrain);
        emit SmolBrainSet(_smolBrain);
    }

    /// @param _iqPerWeek NUmber of IQ points to earn a week, 18 decimals
    function setIqPerWeek(uint256 _iqPerWeek) external onlyOwner {
        iqPerWeek = _iqPerWeek;
        emit SetIqPerWeek(_iqPerWeek);
    }
}

File 18 of 20 : Ownable.sol
// SPDX-License-Identifier: MIT

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() {
        _setOwner(_msgSender());
    }

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

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

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 19 of 20 : AccessControl.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role, _msgSender());
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(uint160(account), 20),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    function _grantRole(bytes32 role, address account) private {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    function _revokeRole(bytes32 role, address account) private {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

File 20 of 20 : IAccessControl.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

Contract ABI

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tes32"},{"internalType":"address","name":"account","type":"address"}],"name":"grantRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"hasRole","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_minter","type":"address"}],"name":"isMinter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_owner","type":"address"}],"name":"isOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"landLevels","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"landMaxLevel","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"levelIQCost","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"renounceRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"revokeRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_baseURItoSet","type":"string"}],"name":"setBaseURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_levelIQCost","type":"uint256"}],"name":"setLevelIQCost","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_landMaxLevel","type":"uint256"}],"name":"setMaxLevel","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_smolBrain","type":"address"}],"name":"setSmolBrain","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"smolBrain","outputs":[{"internalType":"contract SmolBrain","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"upgrade","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"upgradeSafe","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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