// SPDX-License-Identifier: MIT
// Klaytn Contract Library v1.0.0 (KIP/token/KIP17/extensions/draft-KIP17Votes.sol)
// Based on OpenZeppelin Contracts v4.5.0 (token/ERC721/extensions/draft-ERC721Votes.sol)
// https://github.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v4.5.0

pragma solidity ^0.8.0;

import "../KIP17.sol";
import "../../../../governance/utils/Votes.sol";

/**
 * @dev Extension of KIP17 to support voting and delegation as implemented by {Votes}, where each individual NFT counts
 * as 1 vote unit.
 *
 * Tokens do not count as votes until they are delegated, because votes must be tracked which incurs an additional cost
 * on every transfer. Token holders can either delegate to a trusted representative who will decide how to make use of
 * the votes in governance decisions, or they can delegate to themselves to be their own representative.
 *
 * _Available since v4.5._
 */
abstract contract KIP17Votes is KIP17, Votes {
    /**
     * @dev Adjusts votes when tokens are transferred.
     *
     * Emits a {Votes-DelegateVotesChanged} event.
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        _transferVotingUnits(from, to, 1);
        super._afterTokenTransfer(from, to, tokenId);
    }

    /**
     * @dev Returns the balance of `account`.
     */
    function _getVotingUnits(address account) internal view virtual override returns (uint256) {
        return balanceOf(account);
    }
}