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3pragma solidity 0.8.4;
4pragma experimental ABIEncoderV2;
5
6import "../interfaces/IStaking.sol";
7import "../interfaces/IVoteOlive.sol";
8import "../interfaces/IManager.sol";
9import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
10import {SafeMathUpgradeable as SafeMath} from "@openzeppelin/contracts-upgradeable/utils/math/SafeMathUpgradeable.sol";
11import {MathUpgradeable as Math} from "@openzeppelin/contracts-upgradeable/utils/math/MathUpgradeable.sol";
12import {IERC20Upgradeable as IERC20} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
13import {SafeERC20Upgradeable as SafeERC20} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
14import {OwnableUpgradeable as Ownable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
15import {EnumerableSetUpgradeable as EnumerableSet} from "@openzeppelin/contracts-upgradeable/utils/structs/EnumerableSetUpgradeable.sol";
16import {PausableUpgradeable as Pausable} from "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
17import {ReentrancyGuardUpgradeable as ReentrancyGuard} from "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";
18import "../interfaces/events/BalanceUpdateEvent.sol";
19
20
21contract Staking is IStaking, Initializable, Ownable, Pausable, ReentrancyGuard {
22    using SafeMath for uint256;