// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.7.6;

interface IBaseToken {
    // Do NOT change the order of enum values because it will break backwards compatibility
    enum Status { Open, Paused, Closed }

    event PriceFeedChanged(address indexed priceFeed);
    event StatusUpdated(Status indexed status);

    function close() external;

    /// @notice Update the cached index price of the token.
    /// @param interval The twap interval in seconds.
    function cacheTwap(uint256 interval) external;

    /// @notice Get the price feed address
    /// @dev priceFeed is now priceFeedDispatcher, which dispatches either Chainlink or UniswapV3 price
    /// @return priceFeed the current price feed
    function getPriceFeed() external view returns (address priceFeed);

    function getPausedTimestamp() external view returns (uint256);

    function getPausedIndexPrice() external view returns (uint256);

    function getClosedPrice() external view returns (uint256);

    function isOpen() external view returns (bool);

    function isPaused() external view returns (bool);

    function isClosed() external view returns (bool);
}