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

import "../../userInterfaces/IVPToken.sol";
import "../../userInterfaces/IGovernanceVotePower.sol";

interface IIGovernanceVotePower is IGovernanceVotePower {
    /**
     * Update vote powers when tokens are transfered.
     **/
    function updateAtTokenTransfer(
        address _from, 
        address _to, 
        uint256 _fromBalance,
        uint256 _toBalance,
        uint256 _amount
    ) external;
    
    /**
     * Set the cleanup block number.
     * Historic data for the blocks before `cleanupBlockNumber` can be erased,
     * history before that block should never be used since it can be inconsistent.
     * In particular, cleanup block number must be before current vote power block.
     * @param _blockNumber The new cleanup block number.
     */
    function setCleanupBlockNumber(uint256 _blockNumber) external;
    
    /**
     * Set the contract that is allowed to call history cleaning methods.
     */
    function setCleanerContract(address _cleanerContract) external;
        
   /**
    * @notice Get the token that this governance vote power contract belongs to.
    */
    function ownerToken() external view returns(IVPToken);
}