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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

interface IERC165 {
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

interface IERC721 is IERC165 {
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    function balanceOf(address owner) external view returns (uint256);
    function ownerOf(uint256 tokenId) external view returns (address);
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
    function safeTransferFrom(address from, address to, uint256 tokenId) external;
    function transferFrom(address from, address to, uint256 tokenId) external;
    function approve(address to, uint256 tokenId) external;
    function setApprovalForAll(address operator, bool approved) external;
    function getApproved(uint256 tokenId) external view returns (address);
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

interface IERC721Metadata is IERC721 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

interface IERC721Receiver {
    function onERC721Received(address operator, address from, uint256 tokenId, bytes memory data) external returns (bytes4);
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}

abstract contract ERC165 is IERC165 {
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

contract NFT1Collection is Context, ERC165, IERC721, IERC721Metadata {
    using Strings for uint256;

    string private _name;
    string private _symbol;
    address private _owner;

    mapping(uint256 => address) private _owners;
    mapping(address => uint256) private _balances;
    mapping(uint256 => address) private _tokenApprovals;
    mapping(address => mapping(address => bool)) private _operatorApprovals;
    mapping(uint256 => string) private _tokenURIs;

    uint256 private _nextTokenId;

    modifier onlyOwner() {
        require(msg.sender == _owner, "Not owner");
        _;
    }

    constructor() {
        _owner = msg.sender;
        _name = "NFT1 Art Collection";
        _symbol = "NFT1";
        _nextTokenId = 1;
    }

    // --- Core ERC721 Logic ---
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return interfaceId == type(IERC721).interfaceId ||
               interfaceId == type(IERC721Metadata).interfaceId ||
               super.supportsInterface(interfaceId);
    }

    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: zero address");
        return _balances[owner];
    }

    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: invalid token ID");
        return _owners[tokenId];
    }

    function name() public view virtual override returns (string memory) {
        return _name;
    }

    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);
        string memory uri = _tokenURIs[tokenId];
        return bytes(uri).length > 0 ? uri : tokenId.toString();  // ✅ Fix
    }

    // --- Minting (Restricted) ---
    function mint(address to, string memory uri) public onlyOwner returns (uint256) {
        uint256 tokenId = _nextTokenId++;
        _mint(to, tokenId);
        _setTokenURI(tokenId, uri);
        return tokenId;
    }

    // --- Internal Logic ---
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to zero address");
        require(!_exists(tokenId), "ERC721: token exists");
        _balances[to]++;
        _owners[tokenId] = to;
        emit Transfer(address(0), to, tokenId);
    }

    function _setTokenURI(uint256 tokenId, string memory uri) internal virtual {
        require(_exists(tokenId), "ERC721: token does not exist");
        _tokenURIs[tokenId] = uri;
    }

    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    // --- Approvals & Transfers ---
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = _owners[tokenId];  // ✅ Fix
        require(to != owner, "ERC721: approval to current owner");
        require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()), "ERC721: not authorized");
        _approve(to, tokenId);
    }

    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(_owners[tokenId], to, tokenId);  // ✅ Fix
    }

    function _setApprovalForAll(address owner, address operator, bool approved) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    function _transfer(address from, address to, uint256 tokenId) internal virtual {
        require(_owners[tokenId] == from, "ERC721: transfer from incorrect owner");  // ✅ Fix
        require(to != address(0), "ERC721: transfer to zero address");
        _approve(address(0), tokenId);
        _balances[from]--;
        _balances[to]++;
        _owners[tokenId] = to;
        emit Transfer(from, to, tokenId);
    }

    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        address owner = _owners[tokenId];  // ✅ Fix
        return spender == owner || isApprovedForAll(owner, spender) || _tokenApprovals[tokenId] == spender;
    }

    // --- Safe Transfer with ERC721Receiver Check ---
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: not authorized");
        _transfer(from, to, tokenId);
        if (to.code.length > 0) {
            _checkOnERC721Received(from, to, tokenId, data);  // ✅ Ajout
        }
    }

    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory data) internal virtual {
        try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 response) {
            require(response == IERC721Receiver.onERC721Received.selector, "ERC721: ERC721Receiver rejected tokens");
        } catch {
            revert("ERC721: transfer to non-ERC721Receiver implementer");
        }
    }

    // --- Standard Overrides ---
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);
        return _tokenApprovals[tokenId];
    }

    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: not authorized");
        _transfer(from, to, tokenId);
    }

    function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }
}

library Strings {
    function toString(uint256 value) internal pure returns (string memory) {
        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--;
            buffer[digits] = bytes1(uint8(48 + value % 10));
            value /= 10;
        }
        return string(buffer);
    }
}

{
  "evmVersion": "cancun",
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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