// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0 <0.9.0;

import "../libs/Witnet.sol";

interface IWitOracleTrustless {

    event Rollup(Witnet.Beacon head);

    function determineBeaconIndexFromTimestamp(Witnet.Timestamp timestamp) external pure returns (uint64);
    function determineEpochFromTimestamp(Witnet.Timestamp timestamp) external pure returns (Witnet.BlockNumber);

    function getBeaconByIndex(uint32 index) external view returns (Witnet.Beacon memory);
    function getGenesisBeacon() external pure returns (Witnet.Beacon memory);
    function getLastKnownBeacon() external view returns (Witnet.Beacon memory);
    function getLastKnownBeaconIndex() external view returns (uint32);

    function rollupBeacons(Witnet.FastForward[] calldata ff) external returns (Witnet.Beacon memory);
}