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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/utils/ReentrancyGuard.sol';

import './interfaces/HMTokenInterface.sol';
import './interfaces/IEscrow.sol';
import './interfaces/IStaking.sol';
import './libs/Stakes.sol';

/**
 * @title Staking contract
 * @dev The Staking contract allows to stake.
 */
contract Staking is IStaking, Ownable, ReentrancyGuard {
    using Stakes for Stakes.Staker;

    // Token address
    address public token;

    // Minimum amount of tokens a staker needs to stake
    uint256 public minimumStake;

    // Time in blocks to unstake
    uint32 public lockPeriod;

    // Staker stakes: staker => Stake
    mapping(address => Stakes.Staker) public stakes;

    // List of stakers
    address[] public stakers;

    // Fee percentage
    uint8 public feePercentage;

    // Accumulated fee balance in the contract
    uint256 public feeBalance;

    mapping(address => bool) public slashers;

    /**
     * @dev Emitted when `staker` stake `tokens` amount.
     */
    event StakeDeposited(address indexed staker, uint256 tokens);

    /**
     * @dev Emitted when `staker` unstaked and locked `tokens` amount `until` block.
     */
    event StakeLocked(address indexed staker, uint256 tokens, uint256 until);

    /**
     * @dev Emitted when `staker` withdraws `tokens` staked.
     */
    event StakeWithdrawn(address indexed staker, uint256 tokens);

    /**
     * @dev Emitted when `staker` was slashed for a total of `tokens` amount.
     */
    event StakeSlashed(
        address indexed staker,
        uint256 tokens,
        address indexed escrowAddress,
        address slashRequester
    );

    /**
     * @dev Emitted when `owner` withdraws the total `amount` of fees.
     */
    event FeeWithdrawn(uint256 amount);

    constructor(
        address _token,
        uint256 _minimumStake,
        uint32 _lockPeriod,
        uint8 _feePercentage
    ) Ownable(msg.sender) {
        token = _token;
        _setMinimumStake(_minimumStake);
        _setLockPeriod(_lockPeriod);
        _setFeePercentage(_feePercentage);
        slashers[owner()] = true;
    }

    /**
     * @dev Set the minimum stake amount.
     * @param _minimumStake Minimum stake
     */
    function setMinimumStake(
        uint256 _minimumStake
    ) external override onlyOwner {
        _setMinimumStake(_minimumStake);
    }

    function _setMinimumStake(uint256 _minimumStake) private {
        require(_minimumStake > 0, 'Must be a positive number');
        minimumStake = _minimumStake;
    }

    /**
     * @dev Set the lock period for unstaking.
     * @param _lockPeriod Period in blocks to wait for token withdrawals after unstaking
     */
    function setLockPeriod(uint32 _lockPeriod) external override onlyOwner {
        _setLockPeriod(_lockPeriod);
    }

    function _setLockPeriod(uint32 _lockPeriod) private {
        require(_lockPeriod > 0, 'Must be a positive number');
        lockPeriod = _lockPeriod;
    }

    /**
     * @dev Set the fee percentage for slashing.
     * @param _feePercentage Fee percentage for slashing
     */
    function setFeePercentage(uint8 _feePercentage) external onlyOwner {
        _setFeePercentage(_feePercentage);
    }

    function _setFeePercentage(uint8 _feePercentage) private {
        require(_feePercentage <= 100, 'Fee cannot exceed 100%');
        feePercentage = _feePercentage;
    }

    /**
     * @dev Getter that returns whether a staker has any available stake.
     * @param _staker Address of the staker
     * @return True if staker has available tokens staked
     */
    function getAvailableStake(
        address _staker
    ) external view override returns (uint256) {
        return stakes[_staker].tokensAvailable();
    }

    /**
     * @dev Get the total amount of tokens staked by the staker.
     * @param _staker Address of the staker
     * @return Amount of tokens staked by the staker
     */
    function getStakedTokens(
        address _staker
    ) external view override returns (uint256) {
        return stakes[_staker].tokensStaked;
    }

    /**
     * @dev Get list of stakers
     * @param _startIndex Index of the first staker to return.
     * @param _limit Maximum number of stakers to return.
     * @return List of staker's addresses, and stake data
     */
    function getListOfStakers(
        uint256 _startIndex,
        uint256 _limit
    ) external view returns (address[] memory, Stakes.Staker[] memory) {
        uint256 _stakersCount = stakers.length;

        require(_startIndex < _stakersCount, 'Start index out of bounds');

        uint256 endIndex = _startIndex + _limit > _stakersCount
            ? _stakersCount
            : _startIndex + _limit;
        address[] memory _stakerAddresses = new address[](
            endIndex - _startIndex
        );
        Stakes.Staker[] memory _stakers = new Stakes.Staker[](
            endIndex - _startIndex
        );

        for (uint256 i = _startIndex; i < endIndex; i++) {
            _stakerAddresses[i - _startIndex] = stakers[i];
            _stakers[i - _startIndex] = stakes[stakers[i]];
        }

        return (_stakerAddresses, _stakers);
    }

    /**
     * @dev Deposit tokens on the staker stake.
     * @param _tokens Amount of tokens to stake
     */
    function stake(uint256 _tokens) external override {
        require(_tokens > 0, 'Must be a positive number');
        Stakes.Staker storage staker = stakes[msg.sender];
        require(
            staker.tokensAvailable() + _tokens >= minimumStake,
            'Total stake is below the minimum threshold'
        );

        if (staker.tokensStaked == 0) {
            stakers.push(msg.sender);
        }

        _safeTransferFrom(token, msg.sender, address(this), _tokens);
        staker.deposit(_tokens);

        emit StakeDeposited(msg.sender, _tokens);
    }

    /**
     * @dev Unstake tokens from the staker's stake, locking them until lock period expires.
     * @param _tokens Amount of tokens to unstake
     */
    function unstake(uint256 _tokens) external override nonReentrant {
        require(_tokens > 0, 'Must be a positive number');
        Stakes.Staker storage staker = stakes[msg.sender];
        require(
            staker.tokensLocked == 0 ||
                staker.tokensLockedUntil <= block.number,
            'Unstake in progress, complete it first'
        );
        uint256 stakeAvailable = staker.tokensAvailable();
        require(stakeAvailable >= _tokens, 'Insufficient amount to unstake');

        uint256 tokensToWithdraw = staker.tokensWithdrawable();
        if (tokensToWithdraw > 0) {
            _withdraw(msg.sender);
        }

        staker.lockTokens(_tokens, lockPeriod);

        emit StakeLocked(
            msg.sender,
            staker.tokensLocked,
            staker.tokensLockedUntil
        );
    }

    /**
     * @dev Withdraw staker tokens once the lock period has passed.
     */
    function withdraw() external override nonReentrant {
        _withdraw(msg.sender);
    }

    function _withdraw(address _staker) private {
        uint256 tokensToWithdraw = stakes[_staker].withdrawTokens();
        require(
            tokensToWithdraw > 0,
            'Stake has no available tokens for withdrawal'
        );
        _safeTransfer(token, _staker, tokensToWithdraw);

        emit StakeWithdrawn(_staker, tokensToWithdraw);
    }

    /**
     * @dev Slash the staker's stake.
     * @param _staker Address of staker to slash
     * @param _escrowAddress Escrow address
     * @param _tokens Amount of tokens to slash from the staker's stake
     */
    function slash(
        address _slashRequester,
        address _staker,
        address _escrowAddress,
        uint256 _tokens
    ) external override onlySlasher nonReentrant {
        require(
            _slashRequester != address(0),
            'Must be a valid slash requester address'
        );
        require(_escrowAddress != address(0), 'Must be a valid escrow address');
        Stakes.Staker storage staker = stakes[_staker];
        require(_tokens > 0, 'Must be a positive number');
        require(
            _tokens <= staker.tokensStaked,
            'Slash amount exceeds staked amount'
        );

        uint256 feeAmount = (_tokens * feePercentage) / 100;
        uint256 tokensToSlash = _tokens - feeAmount;

        staker.release(tokensToSlash);
        feeBalance += feeAmount;

        _safeTransfer(token, _slashRequester, tokensToSlash);

        emit StakeSlashed(
            _staker,
            tokensToSlash,
            _escrowAddress,
            _slashRequester
        );
    }

    /**
     * @dev Withdraw the total amount of fees accumulated.
     */
    function withdrawFees() external override onlyOwner nonReentrant {
        require(feeBalance > 0, 'No fees to withdraw');
        uint256 amount = feeBalance;
        feeBalance = 0;

        _safeTransfer(token, msg.sender, amount);

        emit FeeWithdrawn(amount);
    }

    /**
     * @dev Add a new slasher address.
     */
    function addSlasher(address _slasher) external override onlyOwner {
        require(_slasher != address(0), 'Invalid slasher address');
        require(!slashers[_slasher], 'Address is already a slasher');
        slashers[_slasher] = true;
    }

    /**
     * @dev Remove an existing slasher address.
     */
    function removeSlasher(address _slasher) external override onlyOwner {
        require(slashers[_slasher], 'Address is not a slasher');
        delete slashers[_slasher];
    }

    modifier onlySlasher() {
        require(slashers[msg.sender], 'Caller is not a slasher');
        _;
    }

    /**
     * @dev Safe transfer helper
     */
    function _safeTransfer(
        address _token,
        address _to,
        uint256 _value
    ) private {
        SafeERC20.safeTransfer(IERC20(_token), _to, _value);
    }

    /**
     * @dev Safe transferFrom helper
     */
    function _safeTransferFrom(
        address _token,
        address _from,
        address _to,
        uint256 _value
    ) private {
        SafeERC20.safeTransferFrom(IERC20(_token), _from, _to, _value);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC20Permit} from "../extensions/IERC20Permit.sol";
import {Address} from "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev An operation with an ERC20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data);
        if (returndata.length != 0 && !abi.decode(returndata, (bool))) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return success && (returndata.length == 0 || abi.decode(returndata, (bool))) && address(token).code.length > 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Address.sol)

pragma solidity ^0.8.20;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error AddressInsufficientBalance(address account);

    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedInnerCall();

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert AddressInsufficientBalance(address(this));
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert FailedInnerCall();
        }
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {FailedInnerCall} error.
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert AddressInsufficientBalance(address(this));
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {FailedInnerCall}) in case of an
     * unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {FailedInnerCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

    /**
     * @dev Reverts with returndata if present. Otherwise reverts with {FailedInnerCall}.
     */
    function _revert(bytes memory returndata) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert FailedInnerCall();
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant NOT_ENTERED = 1;
    uint256 private constant ENTERED = 2;

    uint256 private _status;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    constructor() {
        _status = NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        _status = ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == ENTERED;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2;

interface HMTokenInterface {
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(
        address indexed _owner,
        address indexed _spender,
        uint256 _value
    );

    /// @param _owner The address from which the balance will be retrieved
    /// @return balance The balance
    function balanceOf(address _owner) external view returns (uint256 balance);

    /// @notice send `_value` token to `_to` from `msg.sender`
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return success Whether the transfer was successful or not
    function transfer(
        address _to,
        uint256 _value
    ) external returns (bool success);

    /// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
    /// @param _from The address of the sender
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return success Whether the transfer was successful or not
    function transferFrom(
        address _from,
        address _to,
        uint256 _value
    ) external returns (bool success);

    function transferBulk(
        address[] calldata _tos,
        uint256[] calldata _values,
        uint256 _txId
    ) external returns (uint256 _bulkCount);

    /// @notice `msg.sender` approves `_spender` to spend `_value` tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @param _value The amount of tokens to be approved for transfer
    /// @return success Whether the approval was successful or not
    function approve(
        address _spender,
        uint256 _value
    ) external returns (bool success);

    /// @param _owner The address of the account owning tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @return remaining Amount of remaining tokens allowed to spent
    function allowance(
        address _owner,
        address _spender
    ) external view returns (uint256 remaining);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IEscrow {
    enum EscrowStatuses {
        Launched,
        Pending,
        Partial,
        Paid,
        Complete,
        Cancelled
    }

    function status() external view returns (EscrowStatuses);

    function addTrustedHandlers(address[] memory _handlers) external;

    function setup(
        address _reputationOracle,
        address _recordingOracle,
        address _exchangeOracle,
        uint8 _reputationOracleFeePercentage,
        uint8 _recordingOracleFeePercentage,
        uint8 _exchangeOracleFeePercentage,
        string memory _url,
        string memory _hash
    ) external;

    function cancel() external returns (bool);

    function withdraw(address _token) external returns (bool);

    function complete() external;

    function storeResults(string memory _url, string memory _hash) external;

    function bulkPayOut(
        address[] memory _recipients,
        uint256[] memory _amounts,
        string memory _url,
        string memory _hash,
        uint256 _txId,
        bool forceComplete
    ) external;

    function bulkPayOut(
        address[] memory _recipients,
        uint256[] memory _amounts,
        string memory _url,
        string memory _hash,
        uint256 _txId
    ) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import '../libs/Stakes.sol';

interface IStaking {
    function setMinimumStake(uint256 _minimumStake) external;

    function setLockPeriod(uint32 _lockPeriod) external;

    function getAvailableStake(address _staker) external view returns (uint256);

    function getStakedTokens(address _staker) external view returns (uint256);

    function stake(uint256 _tokens) external;

    function unstake(uint256 _tokens) external;

    function withdraw() external;

    function slash(
        address _slasher,
        address _staker,
        address _escrowAddress,
        uint256 _tokens
    ) external;

    function getListOfStakers(
        uint256 _startIndex,
        uint256 _limit
    ) external view returns (address[] memory, Stakes.Staker[] memory);

    function withdrawFees() external;

    function addSlasher(address _slasher) external;

    function removeSlasher(address _slasher) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title Structures, methods and data are available to manage the staker state.
 */
library Stakes {
    struct Staker {
        uint256 tokensStaked; // Tokens staked by the Staker
        uint256 tokensLocked; // Tokens locked for withdrawal
        uint256 tokensLockedUntil; // Tokens locked until time
    }

    /**
     * @dev Deposit tokens to the staker stake.
     * @param stake Staker struct
     * @param _tokens Amount of tokens to deposit
     */
    function deposit(Stakes.Staker storage stake, uint256 _tokens) internal {
        stake.tokensStaked += _tokens;
    }

    /**
     * @dev Release tokens from the staker stake.
     * @param stake Staker struct
     * @param _tokens Amount of tokens to release
     */
    function release(Stakes.Staker storage stake, uint256 _tokens) internal {
        stake.tokensStaked -= _tokens;
    }

    /**
     * @dev Lock tokens until a lock period pass.
     * @param stake Staker struct
     * @param _tokens Amount of tokens to unstake
     * @param _period Period in blocks that need to pass before withdrawal
     */
    function lockTokens(
        Stakes.Staker storage stake,
        uint256 _tokens,
        uint256 _period
    ) internal {
        stake.tokensLocked += _tokens;
        stake.tokensLockedUntil = block.number + _period;
    }

    /**
     * @dev Unlock tokens.
     * @param stake Staker struct
     * @param _tokens Amount of tokens to unlock
     */
    function unlockTokens(
        Stakes.Staker storage stake,
        uint256 _tokens
    ) internal {
        stake.tokensLocked -= _tokens;
        stake.tokensLockedUntil = 0;
    }

    /**
     * @dev Return all tokens available for withdrawal.
     * @param stake Staker struct
     * @return Amount of tokens available for withdrawal
     */
    function withdrawTokens(
        Stakes.Staker storage stake
    ) internal returns (uint256) {
        uint256 tokensToWithdraw = tokensWithdrawable(stake);

        if (tokensToWithdraw > 0) {
            unlockTokens(stake, tokensToWithdraw);
            release(stake, tokensToWithdraw);
        }

        return tokensToWithdraw;
    }

    /**
     * @dev Return all tokens available in stake.
     * @param stake Staker struct
     * @return Token amount
     */
    function tokensAvailable(
        Stakes.Staker memory stake
    ) internal pure returns (uint256) {
        return stake.tokensStaked - stake.tokensLocked;
    }

    /**
     * @dev Tokens available for withdrawal after lock period.
     * @param stake Staker struct
     * @return Token amount
     */
    function tokensWithdrawable(
        Stakes.Staker memory stake
    ) internal view returns (uint256) {
        if (
            stake.tokensLockedUntil == 0 ||
            block.number < stake.tokensLockedUntil
        ) {
            return 0;
        }
        return stake.tokensLocked;
    }
}

{
  "viaIR": true,
  "optimizer": {
    "enabled": true,
    "runs": 10
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

[{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_minimumStake","type":"uint256"},{"internalType":"uint32","name":"_lockPeriod","type":"uint32"},{"internalType":"uint8","name":"_feePercentage","type":"uint8"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address","name":"target","type":"address"}],"name":"AddressEmptyCode","type":"error"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"AddressInsufficientBalance","type":"error"},{"inputs":[],"name":"FailedInnerCall","type":"error"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"OwnableInvalidOwner","type":"error"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"OwnableUnauthorizedAccount","type":"error"},{"inputs":[],"name":"ReentrancyGuardReentrantCall","type":"error"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"SafeERC20FailedOperation","type":"error"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"FeeWithdrawn","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokens","type":"uint256"}],"name":"StakeDeposited","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokens","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"until","type":"uint256"}],"name":"StakeLocked","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokens","type":"uint256"},{"indexed":true,"internalType":"address","name":"escrowAddress","type":"address"},{"indexed":false,"internalType":"address","name":"slashRequester","type":"address"}],"name":"StakeSlashed","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokens","type":"uint256"}],"name":"StakeWithdrawn","type":"event"},{"inputs":[{"internalType":"address","name":"_slasher","type":"address"}],"name":"addSlasher","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"feeBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"feePercentage","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_staker","type":"address"}],"name":"getAvailableStake","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_startIndex","type":"uint256"},{"internalType":"uint256","name":"_limit","type":"uint256"}],"name":"getListOfStakers","outputs":[{"internalType":"address[]","name":"","type":"address[]"},{"components":[{"internalType":"uint256","name":"tokensStaked","type":"uint256"},{"internalType":"uint256","name":"tokensLocked","type":"uint256"},{"internalType":"uint256","name":"tokensLockedUntil","type":"uint256"}],"internalType":"struct Stakes.Staker[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_staker","type":"address"}],"name":"getStakedTokens","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lockPeriod","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minimumStake","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_slasher","type":"address"}],"name":"removeSlasher","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint8","name":"_feePercentage","type":"uint8"}],"name":"setFeePercentage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"_lockPeriod","type":"uint32"}],"name":"setLockPeriod","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_minimumStake","type":"uint256"}],"name":"setMinimumStake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_slashRequester","type":"address"},{"internalType":"address","name":"_staker","type":"address"},{"internalType":"address","name":"_escrowAddress","type":"address"},{"internalType":"uint256","name":"_tokens","type":"uint256"}],"name":"slash","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"slashers","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokens","type":"uint256"}],"name":"stake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"stakers","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"stakes","outputs":[{"internalType":"uint256","name":"tokensStaked","type":"uint256"},{"internalType":"uint256","name":"tokensLocked","type":"uint256"},{"internalType":"uint256","name":"tokensLockedUntil","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokens","type":"uint256"}],"name":"unstake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawFees","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000792abbcc99c01dbdec49c9fa9a828a186da45c33000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000003e80000000000000000000000000000000000000000000000000000000000000001

-----Decoded View---------------
Arg [0] : _token (address): 0x792abbcC99c01dbDec49c9fa9A828a186Da45C33
Arg [1] : _minimumStake (uint256): 1
Arg [2] : _lockPeriod (uint32): 1000
Arg [3] : _feePercentage (uint8): 1

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000792abbcc99c01dbdec49c9fa9a828a186da45c33
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [2] : 00000000000000000000000000000000000000000000000000000000000003e8
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000001