pragma solidity ^0.8.9;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

contract NameService is ERC721 {

uint256 public maxSupply;

uint256 public totalSupply;

address payable public owner;

uint _id = 0;

// mapping from name to address

mapping(string => address payable) public nameToAddress;

mapping(address => string) public addressToName;

mapping(uint256 => string) public tokenIdToName;

constructor(string memory _name, string memory _symbol)

ERC721(_name, _symbol)

{

}

// function to create a name

function createName(string memory _name) public payable {

// check if the name has already been taken

require(nameToAddress[_name] == address(0), "Name has already been taken");

// assign the name to the address

nameToAddress[_name] = payable(msg.sender);

// assign the name to the address in the addressToName mapping

addressToName[payable(msg.sender)] = _name;

// assign the token ID to the name

tokenIdToName[_id] = _name;

totalSupply++;

_id++;

_safeMint(msg.sender, _id);

}

// function to send ether using a name

function sendEther(string memory _name, uint _value) public payable {

// get the address associated with the name

address payable recipient = nameToAddress[_name];

// send the ether to the address

recipient.transfer(_value);

}

function getName() public view returns (string memory) {

return addressToName[msg.sender];

}

function transferFrom(address from, address to, uint256 tokenId) public override {

super.transferFrom(from, to, tokenId);

tokenIdToName[tokenId] = addressToName[to];

}

}