// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import { IERC4907A } from "erc721a/contracts/extensions/IERC4907A.sol";

interface IMintBurnableERC4907 {
    function mint(address to, address tokenAddress, uint256 tokenId) external returns (uint256);
    function burn(uint256 tokenId) external;
}

contract Shadow {
    
    address public immutable shadowToken;

    constructor(address _token) {
        shadowToken = _token;
    }

    function _mintToken(
        address to,
        address token,
        uint256 identifier,
        uint256 duration
    ) internal returns (uint256) {
        uint256 tid = IMintBurnableERC4907(shadowToken).mint(address(this), token, identifier);
        IERC4907A(shadowToken).setUser(tid, to, uint64(duration + block.timestamp));
        return tid;
    }

    function _extendToken(address to, uint256 tokenId, uint256 expires) internal {
        IERC4907A(shadowToken).setUser(tokenId, to, uint64(expires));
    }

    function _burnToken(uint256 tokenId) internal {
        IMintBurnableERC4907(shadowToken).burn(tokenId);
    }
}