// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IUintRequests {
    error InvalidRequestId();

    /**
     * @notice Get the number of unprocessed request IDs.
     */
    function requestIdsLength() external view returns (uint256);

    /**
     * @notice Get a list of unprocessed request IDs.
     * @param index index of the first request ID
     * @param maxRequestIds maximum number of request IDs to return
     * @return requestIds request IDs
     */
    function requestIds(uint256 index, uint256 maxRequestIds) external view returns (uint256[] memory requestIds);
}