// File: src/SprotoPepesPFP.sol



pragma solidity ^0.8.17;
import "openzeppelin-contracts/contracts/access/Ownable.sol";

interface ERC721TokenReceiver {
    function onERC721Received(
        address operator,
        address from,
        uint tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

contract SprotoPepesPFP is Ownable {
    string public symbol;
    string public name;
    string public CID;

    address public SprotonCommand;

    uint public totalSupply = 0;

    mapping(uint => address) owners;
    mapping(address => uint) balances;

    uint256[] private _allTokens;
    mapping(uint256 => uint256) private _allTokensIndex;
    mapping(uint256 => uint256) private _ownedTokensIndex;
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

    event Transfer(
        address indexed from,
        address indexed to,
        uint indexed tokenId
    );

    constructor(string memory _symbol, string memory _name) { symbol=_symbol; name=_name;}

    function setCID(string memory _CID) public onlyOwner {
        CID = _CID;
    }

    function setSprotonCommand(address _SprotonCommand) public onlyOwner {
        SprotonCommand = _SprotonCommand;
    }

    function mintPFP(address to, uint tokenId) public {
        require(msg.sender == SprotonCommand, "error SprotonCommand");
        _mint(to, tokenId);
    }

    function transferFrom(address from, address to, uint tokenId) public {
        require(msg.sender == SprotonCommand, "error SprotonCommand");
        _transfer(from, to, tokenId);
    }

    function exist(uint tokenId) public view returns (bool) {
        return owners[tokenId] != address(0);
    }

    function supportsInterface(bytes4 interfaceId) public pure returns (bool) {
        return interfaceId == 0x80ac58cd || interfaceId == 0x5b5e139f;
    }

    function balanceOf(address owner) public view returns (uint) {
        require(address(0) != owner, "error owner");
        return balances[owner];
    }

    function ownerOf(uint id) public view returns (address) {
        require(exist(id), "error exist");
        return owners[id];
    }

    function tokenURI(uint id) public view returns (string memory) {
        require(exist(id), "error exist");
        return string(abi.encodePacked("ipfs://", CID, "/", _toString(id),".json"));
    }

    function _mint(address to, uint id) private {
        address from = address(0);
        require(to != address(0), "error to");
        require(owners[id] == address(0), "error owner");

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(id);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, id);
        }

        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(id);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, id);
        }

        balances[to]++;
        owners[id] = to;
        totalSupply++;

        emit Transfer(address(0), to, id);
        require(
            _checkOnERC721Received(address(0), to, id, ""),
            "error ERC721Receiver"
        );
    }

    function _transfer(address from, address to, uint id) private {
        require(exist(id), "error exist");
        require(to != address(0), "error to");
        require(from == ownerOf(id), "error owner");

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(id);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, id);
        }

        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(id);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, id);
        }

        balances[from]--;
        balances[to]++;
        owners[id] = to;

        emit Transfer(from, to, id);
        require(
            _checkOnERC721Received(address(0), to, id, ""),
            "error ERC721Receiver"
        );
    }

    function tokenOfOwnerByIndex(
        address owner,
        uint256 index
    ) public view virtual returns (uint256) {
        require(index < balanceOf(owner), "error balanceOf");
        return _ownedTokens[owner][index];
    }

    function tokenByIndex(uint256 index) public view virtual returns (uint256) {
        require(index < totalSupply, "error totalSupply");
        return _allTokens[index];
    }

    function _addTokenToOwnerEnumeration(address to, uint256 id) private {
        uint256 length = balanceOf(to);
        _ownedTokens[to][length] = id;
        _ownedTokensIndex[id] = length;
    }

    function _addTokenToAllTokensEnumeration(uint256 id) private {
        _allTokensIndex[id] = _allTokens.length;
        _allTokens.push(id);
    }

    function _removeTokenFromOwnerEnumeration(
        address from,
        uint256 id
    ) private {
        uint256 lastTokenIndex = balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[id];

        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId;
            _ownedTokensIndex[lastTokenId] = tokenIndex;
        }

        delete _ownedTokensIndex[id];
        delete _ownedTokens[from][lastTokenIndex];
    }

    function _removeTokenFromAllTokensEnumeration(uint256 id) private {
        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[id];

        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId;
        _allTokensIndex[lastTokenId] = tokenIndex;

        delete _allTokensIndex[id];
        _allTokens.pop();
    }

    function _checkOnERC721Received(
        address from,
        address to,
        uint id,
        bytes memory _data
    ) internal returns (bool) {
        uint size;

        assembly {
            size := extcodesize(to)
        }

        if (size > 0)
            try
                ERC721TokenReceiver(to).onERC721Received(
                    msg.sender,
                    from,
                    id,
                    _data
                )
            returns (bytes4 retval) {
                return
                    retval == ERC721TokenReceiver(to).onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) revert("error ERC721Receiver");
                else
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
            }
        else return true;
    }

    function _toString(uint value) private pure returns (string memory) {
        if (value == 0) return "0";

        uint digits;
        uint tmp = value;

        while (tmp != 0) {
            digits++;
            tmp /= 10;
        }

        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint(value % 10)));
            value /= 10;
        }

        return string(buffer);
    }
}

// File: lib/openzeppelin-contracts/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: lib/openzeppelin-contracts/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;
    }
}