// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import {IERC721} from "@openzeppelin/contracts/interfaces/IERC721.sol";
import {IERC721Receiver} from "@openzeppelin/contracts/interfaces/IERC721Receiver.sol";
import {IRegistry} from "./IRegistry.sol";

interface INFTLocker is IERC721 {
    function registry() external view returns (IRegistry);

    function balanceOfNFT(uint256) external view returns (uint256);

    function isStaked(uint256) external view returns (bool);

    function epoch() external view returns (uint256);

    function userPointEpoch(uint256) external view returns (uint256);

    function userPointHistory(uint256, uint256)
        external
        view
        returns (Point memory);

    function pointHistory(uint256) external view returns (Point memory);

    function totalSupplyWithoutDecay() external view returns (uint256);

    function isApprovedOrOwner(address, uint256) external view returns (bool);

    function totalSupply() external view returns (uint256);

    function totalSupplyAt(uint256 _block) external view returns (uint256);

    function merge(uint256 _from, uint256 _to) external;

    function blockNumber() external view returns (uint256);

    function checkpoint() external;

    function depositFor(uint256 _tokenId, uint256 _value) external;

    function createLockFor(
        uint256 _value,
        uint256 _lockDuration,
        address _to,
        bool _stakeNFT
    ) external returns (uint256);

    function migrateTokenFor(
        uint256 _value,
        uint256 _lockDuration,
        address _to
    ) external returns (uint256);

    function createLock(
        uint256 _value,
        uint256 _lockDuration,
        bool _stakeNFT
    ) external returns (uint256);

    enum DepositType {
        DEPOSIT_FOR_TYPE,
        CREATE_LOCK_TYPE,
        INCREASE_LOCK_AMOUNT,
        INCREASE_UNLOCK_TIME,
        MERGE_TYPE
    }

    struct Point {
        int128 bias;
        int128 slope; // # -dweight / dt
        uint256 ts;
        uint256 blk; // block
    }

    /* We cannot really do block numbers per se b/c slope is per time, not per block
     * and per block could be fairly bad b/c Ethereum changes blocktimes.
     * What we can do is to extrapolate ***At functions */

    struct LockedBalance {
        int128 amount;
        uint256 end;
        uint256 start;
    }

    event Deposit(
        address indexed provider,
        uint256 tokenId,
        uint256 value,
        uint256 indexed locktime,
        DepositType deposit_type,
        uint256 ts
    );

    event Withdraw(
        address indexed provider,
        uint256 tokenId,
        uint256 value,
        uint256 ts
    );

    event Supply(uint256 prevSupply, uint256 supply);
}