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

/**
 * IICustomFeed interface.
 */
interface IICustomFeed {
    /**
     * Returns the feed id.
     * @return _feedId The feed id.
     */
    function feedId() external view returns (bytes21 _feedId);

    /**
     * Returns the current feed.
     * @return _value The value of the feed.
     * @return _decimals The decimals of the feed.
     * @return _timestamp The timestamp of the feed.
     */
    function getCurrentFeed()
        external
        payable
        returns (uint256 _value, int8 _decimals, uint64 _timestamp);

    /**
     * Calculates the fee for fetching the feed.
     * @return _fee The fee for fetching the feed.
     */
    function calculateFee() external view returns (uint256 _fee);
}