pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;

struct Proposal {
    // Creator of the proposal
    address proposer;
    // target addresses for the call to be made
    address target;
    // The block at which voting begins
    uint256 startTime;
    // The block at which voting ends: votes must be cast prior to this block
    uint256 endTime;
    // Current number of votes in favor of this proposal
    uint256 forVotes;
    // Current number of votes in opposition to this proposal
    uint256 againstVotes;
    // Flag marking whether the proposal has been executed
    bool executed;
    // Flag marking whether the proposal voting time has been extended
    // Voting time can be extended once, if the proposal outcome has changed during CLOSING_PERIOD
    bool extended;
}

interface IGovernance {
    function proposals(uint256 index) external view returns (Proposal memory);

    function proposalCount() external view returns (uint256);

    function lockedBalance(address account) external view returns (uint256);

    function propose(address target, string memory description) external returns (uint256);

    function castVote(uint256 proposalId, bool support) external;

    function lock(address owner, uint256 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external;

    function lockWithApproval(uint256 amount) external;

    function unlock(uint256 amount) external;

    function execute(uint256 proposalId) external payable;
}