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

import "../../IFlareSystemsCalculator.sol";

/**
 * FlareSystemsCalculator internal interface.
 */
interface IIFlareSystemsCalculator is IFlareSystemsCalculator {
    /**
     * Calculates the registration weight of a voter.
     * It is approximation of the staking weight and capped WNat weight to the power of 0.75.
     * @param _voter The address of the voter.
     * @param _rewardEpochId The reward epoch id.
     * @param _votePowerBlockNumber The block number at which the vote power is calculated.
     * @return _registrationWeight The registration weight of the voter.
     * @dev Only VoterRegistry can call this method.
     */
    function calculateRegistrationWeight(
        address _voter,
        uint24 _rewardEpochId,
        uint256 _votePowerBlockNumber
    ) external returns (uint256 _registrationWeight);

    /**
     * Calculates the burn factor for a voter in a given reward epoch.
     * @param _rewardEpochId The reward epoch id.
     * @param _voter The address of the voter.
     */
    function calculateBurnFactorPPM(
        uint24 _rewardEpochId,
        address _voter
    ) external view returns (uint256);
}