// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

interface IISupply {
    /**
     * @notice Updates circulating supply
     * @dev Also updates the burn address amount
     */
    function updateCirculatingSupply() external;

    /**
     * @notice Updates authorized inflation and circulating supply - emits event if error
     * @param _inflationAuthorizedWei               Authorized inflation
     * @dev Also updates the burn address amount
     */
    function updateAuthorizedInflationAndCirculatingSupply(
        uint256 _inflationAuthorizedWei
    ) external;

    /**
     * @notice Get approximate circulating supply for given block number from cache - only past block
     * @param _blockNumber                          Block number
     * @return _circulatingSupplyWei Return approximate circulating supply for last known block <= _blockNumber
     */
    function getCirculatingSupplyAtCached(
        uint256 _blockNumber
    ) external returns (uint256 _circulatingSupplyWei);

    /**
     * @notice Get approximate circulating supply for given block number
     * @param _blockNumber                          Block number
     * @return _circulatingSupplyWei Return approximate circulating supply for last known block <= _blockNumber
     */
    function getCirculatingSupplyAt(
        uint256 _blockNumber
    ) external view returns (uint256 _circulatingSupplyWei);

    /**
     * @notice Get total inflatable balance (initial genesis amount + total authorized inflation)
     * @return _inflatableBalanceWei Return inflatable balance
     */
    function getInflatableBalance()
        external
        view
        returns (uint256 _inflatableBalanceWei);
}