// SPDX-License-Identifier: CC0-1.0
pragma solidity ^0.8.24;

import {ISRC20} from "@openzeppelin/contracts/token/SRC20/ISRC20.sol";
import {ISRC20Metadata} from "@openzeppelin/contracts/token/SRC20/extensions/ISRC20Metadata.sol";

interface ISRC20Checkpointed is ISRC20, ISRC20Metadata {
    /**
     * @dev Error thrown when querying a checkpoint that is in the future.
     * @param checkpoint The requested checkpoint.
     * @param currentCheckpoint The current checkpoint nonce.
     */
    error SRC20FutureCheckpoint(uint48 checkpoint, uint48 currentCheckpoint);

    /**
     * @dev Returns the value of tokens in existence at specified checkpoint.
     * @param checkpoint The checkpoint to get the total supply at.
     * @notice Reverts with SRC20FutureCheckpoint if checkpoint > checkpointNonce().
     */
    function totalSupplyAt(uint48 checkpoint) external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account` at specified checkpoint.
     * @param account The account to get the balance of.
     * @param checkpoint The checkpoint to get the balance at.
     * @notice Reverts with SRC20FutureCheckpoint if checkpoint > checkpointNonce().
     */
    function balanceOfAt(address account, uint48 checkpoint) external view returns (uint256);

    /**
     * @dev Returns the current checkpoint nonce.
     */
    function checkpointNonce() external view returns (uint48);
}