// SPDX-License-Identifier: MIT

pragma solidity ^0.8.15;

import "@openzeppelin/contracts/utils/Strings.sol";

import "../../../../access/ownable/OwnableInternal.sol";

import "./ERC20MetadataInternal.sol";
import "./ERC20MetadataStorage.sol";
import "./IERC20MetadataAdmin.sol";

/**
 * @title ERC20 - Metadata - Admin - Ownable
 * @notice Allows diamond owner to change decimals config or freeze it forever.
 *
 * @custom:type eip-2535-facet
 * @custom:category Tokens
 * @custom:peer-dependencies IERC20Metadata
 * @custom:provides-interfaces IERC20MetadataAdmin
 */
contract ERC20MetadataOwnable is IERC20MetadataAdmin, ERC20MetadataInternal, OwnableInternal {
    function setDecimals(uint8 newDecimals) external override onlyOwner {
        ERC20MetadataStorage.Layout storage l = ERC20MetadataStorage.layout();
        require(!l.decimalsLocked, "ERC20MetadataOwnable: decimals locked");
        l.decimals = newDecimals;
    }

    function lockDecimals() external override onlyOwner {
        ERC20MetadataStorage.Layout storage l = ERC20MetadataStorage.layout();
        l.decimalsLocked = true;
    }
}