// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @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/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @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, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * 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.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @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`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) 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(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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: UNLICENSED
pragma solidity 0.8.23;

import {IERC20} from "openzeppelin-contracts/token/ERC20/IERC20.sol";

import {IDOTypes} from "./IDOTypes.sol";

/**
 * @title IDOStorage
 * @notice Mapps the storage layout of the {IDO} contract.
 * @dev Diamond proxy (ERC-2535) storage style.
 */
library IDOStorage {
    /**
     * @notice Struct reprensenting the whole storage layout of the IDO contract.
     *
     * @param setUp Main setup of the IDO.
     * @param isCrosschainIDO Boolean to check if the IDO is crosschain or on same network as the LinearVesting.
     *                      It's only set to true by LzIDO constructor.
     * @param refundCaller 
                    - LinearVesting address : when IDO & LinearVesting are on the same network.
                    - LayerZero endpoint address : when IDO happened on a chain BUT LinearVesting deployed on another chain.
     * @param totalBUSDReceivedInAllTier Total BUSD received in all tiers.
     * @param refundStart Start time of the refund period.
     * @param refundEnd End time of the refund period.
     * @param phaseNo Phase number of the IDO.
     * @param rootHash Root hash of the Merkle tree.
     * @param tierDetails Mapping of tier number to its details.
     * @param userDetails Mapping of user address to its details.
     */
    struct IDOStruct {
        IDOTypes.SetUp setUp;
        bool isCrosschainIDO;
        address refundCaller;
        uint256 totalBUSDReceivedInAllTier;
        uint32 refundStart;
        uint32 refundEnd;
        bytes32 rootHash;
        mapping(uint256 => IDOTypes.Tier) tierDetails;
        mapping(address => IDOTypes.User) userDetails;
    }

    /// @notice Storage position of {IDOStruct} in {IDO} contract.
    bytes32 public constant IDO_STORAGE = keccak256("ido.storage");

    /**
     * @return idoStruct Whole storage of {IDO} contract.
     */
    function layout() internal pure returns (IDOStruct storage idoStruct) {
        bytes32 position = IDO_STORAGE;
        assembly {
            idoStruct.slot := position
        }
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.23;

abstract contract IDOTypes {
    bytes32 public constant DEFAULT_WITHDRAW_ROLE =
        keccak256("DEFAULT_WITHDRAW_ROLE");

    event DestinationChainUpdated(
        uint16 indexed oldChainId,
        uint16 indexed newChainId
    );
    event UserInvestment(
        address indexed user,
        uint256 amount,
        uint8 indexed phase
    );
    event UserRefund(address indexed user, uint256 amount);
    event RefundPeriodSet(uint256 start, uint256 end);
    event RefundEnabled(bool enabled);
    event LinearVestingSet(address indexed linearVesting);
    event FundsWithdrawn(address token, address to, uint256 amount);

    error ZeroMaxCap();
    error InvalidTimings();
    error ZeroTiers();
    error ZeroTokenAddress();
    error ZeroUsers();
    error ZeroOwnerAddress();
    error ZeroWithdrawerAddress();
    error SaleAlreadyStarted();
    error InvalidSaleEnd();
    error LengthsMismatch();
    error InvalidTierNumber();
    error InvalidMaxTierCap();
    error InvalidMaxUserCap();
    error ZeroUsersInTier();
    error UserNotAuthenticated();
    error UnknownRefundCaller(address caller);
    error SaleNotStarted();
    error SaleEnded();
    error ExceedsPoolMaxCap();
    error UserNotWhitelisted();
    error AmountLessThanUserMinCap();
    error AmountGreaterThanUserMaxCap();
    error AmountGreaterThanTierMaxCap();
    error InsufficientAllowance();
    error InvalidRefundPeriod();
    error ZeroLinearVesting();
    error RefundPeriodNotActive();
    error LinearVestingNotSet();
    error NoInvestmentFound();
    error AlreadyRefunded();
    error TokensAlreadyClaimed();
    error AmountMustBeGreaterThanZero();
    error InsufficientFunds();
    error CrosschainIDO();

    struct Tier {
        uint256 maxTierCap;
        uint256 minUserCap;
        uint256 maxUserCap;
        uint256 amountRaised;
        uint256 users;
    }

    struct User {
        uint256 investedAmount;
        uint248 tier;
        bool hasRefunded;
    }

    /**
     * @notice Struct reprensenting the main setup of the IDO.
     */
    struct SetUp {
        address owner;
        uint32 saleStart;
        uint32 saleEnd;
        uint32 totalUsers;
        uint8 noOfTiers;
        uint8 phaseNo;
        address withdrawer;
        address paymentToken;
        uint256 maxCap;
        string name;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @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 amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves `amount` 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 amount) 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 `amount` 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 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` 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 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @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: UNLICENSED
pragma solidity ^0.8.23;

import {IDOStorage} from "../IDOStorage.sol";
import {IDOTypes} from "../IDOTypes.sol";

interface IIDOReadable {
    function getSetUp() external view returns (IDOTypes.SetUp memory);

    function getTotalBUSDReceivedInAllTier() external view returns (uint256);

    function getRefundPeriod()
        external
        view
        returns (uint256 start, uint256 end);

    function isCrosschainIDO()
        external
        view
        returns (bool, address refundCaller);

    function rootHash() external view returns (bytes32);

    function getTierDetails(
        uint256 tier
    ) external view returns (IDOTypes.Tier memory);

    function getUserDetails(
        address user
    ) external view returns (IDOTypes.User memory);

    function getUserRefundEligibility(
        address user
    ) external view returns (bool);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.23;

interface IIDOWritableRestricted {
    function updateMaxCap(uint256 _maxCap) external;

    function updateStartTime(uint256 newsaleStart) external;

    function updateEndTime(uint256 newSaleEnd) external;

    function updateTiers(
        uint256[] memory _tier,
        uint256[] memory _maxTierCap,
        uint256[] memory _minUserCap,
        uint256[] memory _maxUserCap,
        uint256[] memory _tierUsers
    ) external;

    function updateHash(bytes32 _hash) external;

    /**
     * @dev Function to verify the user's eligibility to participate in the sale using merkle tree
     * @dev Merkle leaf should be keccak256(abi.encode(wallet, tier, chainId, saleContractAddress))
     * @param _wallet Address of the user
     * @param _tier Tier of the user
     * @param proof Merkle proof of the user
     * @param _rootHash Root hash of the merkle tree
     */
    function verify(
        address _wallet,
        uint256 _tier,
        bytes32[] calldata proof,
        bytes32 _rootHash
    ) external view returns (bool);

    /**
     * @dev Function to set the refund period
     * @param _refundStart Start time of the refund period
     * @param _refundEnd End time of the refund period
     */
    function setRefundPeriod(
        uint256 _refundStart,
        uint256 _refundEnd
    ) external payable;

    /**
     * @dev Function to set the refund caller address which differs depdning on crosschain compatibility:
                    - LayerZero endpoint address : when IDO happened on a chain BUT LinearVesting deployed on another chain.
                    - LinearVesting address : when IDO & LinearVesting are on the same network.
     * @param _setRefundCaller Address of the linear vesting contract
     */
    function setRefundCaller(address _setRefundCaller) external;

    /**
     * @dev Function which can only be called by the `refundCaller` or lzEndpoint which refunds the user.
     * @param user Address of the user to refund
     */
    function autoRefund(address user) external;

    function withdrawFunds(address token, address to, uint256 amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {UserAllocation} from "../LinearVestingStruct.sol";

interface ILinearVestingReadable {
    /**
     * @notice Get the claimable amount for a user.
     * @param alloc User allocation.
     */
    function getClaimableAmount(
        UserAllocation calldata alloc
    ) external view returns (uint256 claimableAmount);

    function totalVested() external view returns (uint256);

    function totalClaimed() external view returns (uint256);

    function merkleRoot() external view returns (bytes32);

    function startTime() external view returns (uint32);

    function endTime() external view returns (uint32);

    function userClaims(address) external view returns (uint256);

    function refundStart() external view returns (uint256);

    function refundEnd() external view returns (uint256);

    function isCrosschainIDO() external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {UserAllocation} from "../LinearVestingStruct.sol";

interface ILinearVestingWritable {
    /**
     * @notice Claim tokens for a user.
     * @param alloc User allocation.
     * @param proof Merkle proof.
     */
    function claim(
        UserAllocation calldata alloc,
        bytes32[] calldata proof
    ) external returns (bool);

    /**
     * @notice Get the claimable amount for a user.
     * @param alloc User allocation.
     */
    function getClaimableAmount(
        UserAllocation calldata alloc
    ) external view returns (uint256 claimableAmount);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {UserAllocation} from "../../LinearVestingStruct.sol";

interface ILinearVestingWritableRestricted {
    /**
     * @notice Update the merkle root and vesting period.
     * @param merkleRoot_ New merkle root.
     * @param startTime_ New start time. Can be set in past as we need such purpose, e.g. contract is
     *                   NOT deployed whereas the vesting period should have already started.
     * @param endTime_ New end time.
     * @param toClaim Amount of tokens to lock for claiming. If it's zero, tokens won't be transferred to the contract.
     */
    function update(
        bytes32 merkleRoot_,
        uint32 startTime_,
        uint32 endTime_,
        uint256 toClaim
    ) external returns (bool);

    function setRefundPeriod(
        uint256 _refundStart,
        uint256 _refundEnd
    ) external;
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.23;

import {ILinearVestingReadable} from "./readable/ILinearVestingReadable.sol";

import {LinearVestingWritable} from "./writable/LinearVestingWritable.sol";
import {LinearVestingReadable} from "./readable/LinearVestingReadable.sol";

import {UserAllocation} from "./LinearVestingStruct.sol";

/// @dev ONLY cloneable w/ minimal proxy (ERC-1167) - NOT UPGRADABLE.
contract LinearVesting is LinearVestingWritable, LinearVestingReadable {
    constructor(
        address _token,
        address _ido
    ) LinearVestingWritable(_token, _ido) {}

    function getClaimableAmount(
        UserAllocation calldata alloc
    )
        public
        view
        override(LinearVestingWritable, ILinearVestingReadable)
        returns (uint256 claimableAmount)
    {
        return LinearVestingWritable.getClaimableAmount(alloc);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {ILinearVestingReadable} from "./ILinearVestingReadable.sol";

import {LinearVestingStorage} from "../LinearVestingStorage.sol";

abstract contract LinearVestingReadable is ILinearVestingReadable {
    function startTime() external view returns (uint32) {
        return LinearVestingStorage.layout().ledger.startTime;
    }

    function endTime() external view returns (uint32) {
        return LinearVestingStorage.layout().ledger.startTime;
    }

    function totalVested() external view returns (uint256) {
        return LinearVestingStorage.layout().ledger.totalVested;
    }

    function totalClaimed() external view returns (uint256) {
        return LinearVestingStorage.layout().ledger.totalClaimed;
    }

    function merkleRoot() external view returns (bytes32) {
        return LinearVestingStorage.layout().ledger.merkleRoot;
    }

    function userClaims(address user) external view returns (uint256) {
        return LinearVestingStorage.layout().userClaims[user];
    }

    function refundStart() external view returns (uint256) {
        return LinearVestingStorage.layout().refundStart;
    }

    function refundEnd() external view returns (uint256) {
        return LinearVestingStorage.layout().refundEnd;
    }

    function isCrosschainIDO() external view returns (bool) {
        return LinearVestingStorage.layout().isCrosschainIDO;
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.23;

import {LinearVestingTypes} from "./LinearVestingTypes.sol";

library LinearVestingStorage {
    bytes32 public constant STORAGE_SLOT = keccak256("linearvesting.storage");

    struct Storage {
        LinearVestingTypes.SetUp setUp;
        LinearVestingTypes.Ledger ledger;
        mapping(address => uint256) userClaims;
        bool isCrosschainIDO;
        uint256 refundStart;
        uint256 refundEnd;
    }

    function layout() internal pure returns (Storage storage strg) {
        bytes32 slot = STORAGE_SLOT;
        assembly {
            strg.slot := slot
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

/** @title UserAllocation is used to claim the user's allocation
 * @param user is the address of the user
 * @param amount is the total amount of tokens to claim
 * @param startAmount is the amount of tokens available at TGE
 */
struct UserAllocation {
    address user;
    uint256 amount;
    uint256 startAmount;
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.23;

abstract contract LinearVestingTypes {
    event LinearVestingSetUp(SetUp setUp);

    event SettingsUpdated(
        uint32 indexed start,
        uint32 indexed end,
        uint256 totalVested
    );
    event Claimed(address indexed token, address indexed user, uint256 amount);

    event RefundPeriodUpdated(uint256 indexed start, uint256 indexed end);

    error InvalidTimings();
    error AllocNotFound();
    error NoTokensToClaim();
    error InvalidMerkleRoot();
    error ZeroTokenAddress();
    error NotAuthorized();
    error HasRefunded();
    error NoIDO();
    error RefundNotEnabled();
    error AlreadyClaimedOrRenounced();
    error isCrosschainIDO();

    /**
     * @notice Struct reprensenting the main setup of LinearVesting.
     *
     * @param vestedToken Address of the token to be claimed.
     * @param ido Address of the IDO contract, the vesting is linked to.
     */
    struct SetUp {
        address vestedToken;
        address ido;
    }

    /**
     * @dev Struct representing the ledger/main storage of LinearVesting.
     *
     * @param startTime Start time of the vesting.
     * @param endTime End time of the vesting.
     * @param totalVested amount of vested tokens over the whole existence of the contract (to be claimed by users)
     * @param totalClaimed amount of claimed tokens over the whole existence of the contract.
     * @param merkleRoot Merkle root of user allocations.
     */
    struct Ledger {
        uint32 startTime;
        uint32 endTime;
        uint256 totalVested;
        uint256 totalClaimed;
        bytes32 merkleRoot;
    }
}

abstract contract LinearVestingOAppTypes {
    event RenouncedClaimAndSentCrosschainRefund(
        address indexed user,
        uint32 dstEID,
        bytes32 indexed guid,
        uint256 fee
    );

    event LinearVestingOAppSetUp(
        address indexed token,
        address srcEndpoint,
        uint32 srcEID,
        uint32 dstEID,
        address indexed dstAddress
    );

    error InvalidOrigin(uint32 eid, address sender);

    /**
     * @notice Struct representing the setup parameters for LinearVestingOApp.
     * @param srcEndpoint Address of the source endpoint for LayerZero communication.
     * @param dstEID Destination chain's endpoint ID.
     * @param dstAddress Address of the destination contract on the other chain.
     * @param executor Address of the executor contract.
     * @param nativeCap Maximum amount of native tokens that can be sent in a single transaction.
     * @param sendLibrary Address of the send library for LayerZero.
     * @param receiveLibrary Address of the receive library for LayerZero.
     * @param receiveTimeout Timeout period for receiving messages.
     */
    struct OAppSetUp {
        address srcEndpoint;
        uint32 dstEID;
        address dstAddress;
        address executor;
        uint256 nativeCap;
        address sendLibrary;
        address receiveLibrary;
        uint32 receiveTimeout;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {IERC20} from "openzeppelin-contracts/token/ERC20/IERC20.sol";

import {SafeERC20} from "openzeppelin-contracts/token/ERC20/utils/SafeERC20.sol";

import {ReentrancyGuard} from "openzeppelin-contracts/security/ReentrancyGuard.sol";
import {MerkleProof} from "openzeppelin-contracts/utils/cryptography/MerkleProof.sol";

import {ILinearVestingWritable} from "./ILinearVestingWritable.sol";
import {IIDOReadable} from "../../ido/readable/IIDOReadable.sol";
import {IIDOWritableRestricted} from "../../ido/writable/restricted/IIDOWritableRestricted.sol";

import {LinearVestingWritableRestricted} from "./restricted/LinearVestingWritableRestricted.sol";
import {LinearVestingTypes} from "../LinearVestingTypes.sol";
import {LinearVestingStorage} from "../LinearVestingStorage.sol";

import {UserAllocation} from "../LinearVestingStruct.sol";

/**
 * @title LinearVesting contract
 * @notice A contract to handle linear vesting of tokens.
 * @dev This contract is NOT MADE to be used:
 *           - for a crosschain linear vesting. A vesting of a token will always happen on one and single chain,
 *           - to claim deflationary tokens.
 */
abstract contract LinearVestingWritable is
    ILinearVestingWritable,
    LinearVestingWritableRestricted,
    ReentrancyGuard
{
    using SafeERC20 for IERC20;

    constructor(
        address _token,
        address _ido
    ) LinearVestingWritableRestricted(_token, _ido) {}

    /// @inheritdoc ILinearVestingWritable
    function claim(
        UserAllocation calldata alloc,
        bytes32[] calldata proof
    ) external override nonReentrant whenNotPaused returns (bool) {
        if (alloc.user != msg.sender) {
            revert NotAuthorized();
        }

        if (
            LinearVestingStorage.layout().setUp.ido != address(0) &&
            IIDOReadable(LinearVestingStorage.layout().setUp.ido)
                .getUserDetails(alloc.user)
                .hasRefunded
        ) {
            revert HasRefunded();
        }

        LinearVestingStorage.Storage storage strg = LinearVestingStorage
            .layout();

        if (
            !MerkleProof.verify(
                proof,
                strg.ledger.merkleRoot,
                keccak256(abi.encode(alloc))
            )
        ) {
            revert AllocNotFound();
        }

        uint256 tokens = getClaimableAmount(alloc);
        if (tokens == 0) {
            revert NoTokensToClaim();
        }

        address token = strg.setUp.vestedToken;

        strg.userClaims[alloc.user] += tokens;
        strg.ledger.totalClaimed += tokens;
        IERC20(token).safeTransfer(alloc.user, tokens);

        emit Claimed(token, alloc.user, tokens);

        return true;
    }

    /// @inheritdoc ILinearVestingWritable
    function getClaimableAmount(
        UserAllocation calldata alloc
    ) public view virtual override returns (uint256 claimableAmount) {
        LinearVestingStorage.Storage storage strg = LinearVestingStorage
            .layout();

        if (strg.ledger.startTime > block.timestamp) return 0;

        uint256 amount = alloc.amount;

        if (block.timestamp < strg.ledger.endTime) {
            claimableAmount = _claimableAmount(
                amount,
                alloc.startAmount,
                1e36
            );
        } else {
            claimableAmount = amount;
        }

        claimableAmount -= strg.userClaims[alloc.user];
    }

    /**
     * @dev Internal function to allow test on precision.
     * @param amount Total amount of tokens a user will claim.
     * @param startAmount Initial amount of tokens a user had unlocked before vesting starts.
     * @param precision Precision to use for the calculation - set a 1e36 by default.
     */
    function _claimableAmount(
        uint256 amount,
        uint256 startAmount,
        uint256 precision
    ) internal view returns (uint256) {
        Ledger memory ledger = LinearVestingStorage.layout().ledger;

        uint256 timePassed = block.timestamp - ledger.startTime;
        uint256 totalTime = ledger.endTime - ledger.startTime; // endTime < startTime, 0 is impossible
        uint256 timePassedRatio = (timePassed * precision) / totalTime; // result on 10^36

        /**
         * @dev with 1e36 precision, calculation safe with tokens up to 10^40,
         *      max uint256 is 2^256-1 = 1.15e77
         */
        return
            (((amount - startAmount) * timePassedRatio) / precision) +
            startAmount;
    }

    function renounceClaimAndRefund() external payable virtual {
        _renounceClaim();

        SetUp storage setUp = LinearVestingStorage.layout().setUp;

        if (setUp.ido == address(0)) {
            revert NoIDO();
        }

        IIDOWritableRestricted(setUp.ido).autoRefund(msg.sender);
    }

    function _renounceClaim() internal {
        LinearVestingStorage.Storage storage strg = LinearVestingStorage
            .layout();

        if (strg.refundStart == 0 || strg.refundEnd == 0) {
            revert RefundNotEnabled();
        }
        if (strg.userClaims[msg.sender] > 0) {
            revert AlreadyClaimedOrRenounced();
        }

        strg.userClaims[msg.sender] = type(uint256).max;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {IERC20} from "openzeppelin-contracts/token/ERC20/IERC20.sol";

import {SafeERC20} from "openzeppelin-contracts/token/ERC20/utils/SafeERC20.sol";

import {Ownable} from "openzeppelin-contracts/access/Ownable.sol";
import {Pausable} from "openzeppelin-contracts/security/Pausable.sol";

import {ILinearVestingWritableRestricted} from "./ILinearVestingWritableRestricted.sol";

import {LinearVestingTypes} from "../../LinearVestingTypes.sol";
import {LinearVestingStorage} from "../../LinearVestingStorage.sol";

/**
 * @title LinearVesting contract
 * @notice A contract to handle linear vesting of tokens.
 * @dev This contract is NOT MADE to be used:
 *           - for a crosschain linear vesting. A vesting of a token will always happen on one and single chain,
 *           - to claim deflationary tokens.
 */
abstract contract LinearVestingWritableRestricted is
    ILinearVestingWritableRestricted,
    LinearVestingTypes,
    Ownable,
    Pausable
{
    using SafeERC20 for IERC20;

    constructor(address _token, address _ido) {
        if (_token == address(0)) {
            revert ZeroTokenAddress();
        }

        SetUp storage setUp = LinearVestingStorage.layout().setUp;

        setUp.vestedToken = _token;
        setUp.ido = _ido;

        emit LinearVestingSetUp(setUp);
    }

    function pause() public onlyOwner {
        _pause();
    }

    function unpause() public onlyOwner {
        _unpause();
    }

    /// @inheritdoc ILinearVestingWritableRestricted
    function update(
        bytes32 merkleRoot_,
        uint32 startTime_,
        uint32 endTime_,
        uint256 toClaim
    ) external override onlyOwner returns (bool) {
        if (merkleRoot_ == bytes32(0)) {
            revert InvalidMerkleRoot();
        }

        if (endTime_ < startTime_) {
            revert InvalidTimings();
        }

        Ledger storage ledger = LinearVestingStorage.layout().ledger;

        ledger.merkleRoot = merkleRoot_;
        ledger.startTime = startTime_;
        ledger.endTime = endTime_;

        if (toClaim > 0) {
            IERC20(LinearVestingStorage.layout().setUp.vestedToken)
                .safeTransferFrom(msg.sender, address(this), toClaim);
            ledger.totalVested += toClaim;
        }

        emit SettingsUpdated(startTime_, endTime_, ledger.totalVested);

        return true;
    }

    /// @notice Only IDO is allowed to call this function in a non-crosschain config.
    /// Otherwise LayerZero will call _setRefundPeriod.
    function setRefundPeriod(
        uint256 _refundStart,
        uint256 _refundEnd
    ) external virtual {
        LinearVestingStorage.Storage storage strg = LinearVestingStorage
            .layout();

        if (strg.isCrosschainIDO) {
            revert isCrosschainIDO();
        }

        if (strg.setUp.ido != msg.sender) {
            revert NotAuthorized();
        }

        _setRefundPeriod(strg, _refundStart, _refundEnd);
    }

    /// @dev Only called by LayerZero endpoint call
    function _setRefundPeriod(
        LinearVestingStorage.Storage storage strg,
        uint256 _refundStart,
        uint256 _refundEnd
    ) internal {
        strg.refundStart = _refundStart;
        strg.refundEnd = _refundEnd;

        emit RefundPeriodUpdated(_refundStart, _refundEnd);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.2) (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Tree proofs.
 *
 * The tree and the proofs can be generated using our
 * https://github.com/OpenZeppelin/merkle-tree[JavaScript library].
 * You will find a quickstart guide in the readme.
 *
 * WARNING: You should avoid using leaf values that are 64 bytes long prior to
 * hashing, or use a hash function other than keccak256 for hashing leaves.
 * This is because the concatenation of a sorted pair of internal nodes in
 * the merkle tree could be reinterpreted as a leaf value.
 * OpenZeppelin's JavaScript library generates merkle trees that are safe
 * against this attack out of the box.
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(bytes32[] memory proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }

    /**
     * @dev Calldata version of {verify}
     *
     * _Available since v4.7._
     */
    function verifyCalldata(bytes32[] calldata proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
        return processProofCalldata(proof, leaf) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     *
     * _Available since v4.4._
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            computedHash = _hashPair(computedHash, proof[i]);
        }
        return computedHash;
    }

    /**
     * @dev Calldata version of {processProof}
     *
     * _Available since v4.7._
     */
    function processProofCalldata(bytes32[] calldata proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            computedHash = _hashPair(computedHash, proof[i]);
        }
        return computedHash;
    }

    /**
     * @dev Returns true if the `leaves` can be simultaneously proven to be a part of a merkle tree defined by
     * `root`, according to `proof` and `proofFlags` as described in {processMultiProof}.
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function multiProofVerify(
        bytes32[] memory proof,
        bool[] memory proofFlags,
        bytes32 root,
        bytes32[] memory leaves
    ) internal pure returns (bool) {
        return processMultiProof(proof, proofFlags, leaves) == root;
    }

    /**
     * @dev Calldata version of {multiProofVerify}
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function multiProofVerifyCalldata(
        bytes32[] calldata proof,
        bool[] calldata proofFlags,
        bytes32 root,
        bytes32[] memory leaves
    ) internal pure returns (bool) {
        return processMultiProofCalldata(proof, proofFlags, leaves) == root;
    }

    /**
     * @dev Returns the root of a tree reconstructed from `leaves` and sibling nodes in `proof`. The reconstruction
     * proceeds by incrementally reconstructing all inner nodes by combining a leaf/inner node with either another
     * leaf/inner node or a proof sibling node, depending on whether each `proofFlags` item is true or false
     * respectively.
     *
     * CAUTION: Not all merkle trees admit multiproofs. To use multiproofs, it is sufficient to ensure that: 1) the tree
     * is complete (but not necessarily perfect), 2) the leaves to be proven are in the opposite order they are in the
     * tree (i.e., as seen from right to left starting at the deepest layer and continuing at the next layer).
     *
     * _Available since v4.7._
     */
    function processMultiProof(
        bytes32[] memory proof,
        bool[] memory proofFlags,
        bytes32[] memory leaves
    ) internal pure returns (bytes32 merkleRoot) {
        // This function rebuilds the root hash by traversing the tree up from the leaves. The root is rebuilt by
        // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
        // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
        // the merkle tree.
        uint256 leavesLen = leaves.length;
        uint256 proofLen = proof.length;
        uint256 totalHashes = proofFlags.length;

        // Check proof validity.
        require(leavesLen + proofLen - 1 == totalHashes, "MerkleProof: invalid multiproof");

        // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
        // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
        bytes32[] memory hashes = new bytes32[](totalHashes);
        uint256 leafPos = 0;
        uint256 hashPos = 0;
        uint256 proofPos = 0;
        // At each step, we compute the next hash using two values:
        // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
        //   get the next hash.
        // - depending on the flag, either another value from the "main queue" (merging branches) or an element from the
        //   `proof` array.
        for (uint256 i = 0; i < totalHashes; i++) {
            bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
            bytes32 b = proofFlags[i]
                ? (leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++])
                : proof[proofPos++];
            hashes[i] = _hashPair(a, b);
        }

        if (totalHashes > 0) {
            require(proofPos == proofLen, "MerkleProof: invalid multiproof");
            unchecked {
                return hashes[totalHashes - 1];
            }
        } else if (leavesLen > 0) {
            return leaves[0];
        } else {
            return proof[0];
        }
    }

    /**
     * @dev Calldata version of {processMultiProof}.
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function processMultiProofCalldata(
        bytes32[] calldata proof,
        bool[] calldata proofFlags,
        bytes32[] memory leaves
    ) internal pure returns (bytes32 merkleRoot) {
        // This function rebuilds the root hash by traversing the tree up from the leaves. The root is rebuilt by
        // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
        // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
        // the merkle tree.
        uint256 leavesLen = leaves.length;
        uint256 proofLen = proof.length;
        uint256 totalHashes = proofFlags.length;

        // Check proof validity.
        require(leavesLen + proofLen - 1 == totalHashes, "MerkleProof: invalid multiproof");

        // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
        // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
        bytes32[] memory hashes = new bytes32[](totalHashes);
        uint256 leafPos = 0;
        uint256 hashPos = 0;
        uint256 proofPos = 0;
        // At each step, we compute the next hash using two values:
        // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
        //   get the next hash.
        // - depending on the flag, either another value from the "main queue" (merging branches) or an element from the
        //   `proof` array.
        for (uint256 i = 0; i < totalHashes; i++) {
            bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
            bytes32 b = proofFlags[i]
                ? (leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++])
                : proof[proofPos++];
            hashes[i] = _hashPair(a, b);
        }

        if (totalHashes > 0) {
            require(proofPos == proofLen, "MerkleProof: invalid multiproof");
            unchecked {
                return hashes[totalHashes - 1];
            }
        } else if (leavesLen > 0) {
            return leaves[0];
        } else {
            return proof[0];
        }
    }

    function _hashPair(bytes32 a, bytes32 b) private pure returns (bytes32) {
        return a < b ? _efficientHash(a, b) : _efficientHash(b, a);
    }

    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            value := keccak256(0x00, 0x40)
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../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.
 *
 * By default, the owner account will be the one that deploys the contract. 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;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @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 {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @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 {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _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 v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @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;

    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
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // 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
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../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 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.encodeWithSelector(token.transfer.selector, 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.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 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);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @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.encodeWithSelector(token.approve.selector, spender, value);

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

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @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, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @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.isContract(address(token));
    }
}

{
  "compilationTarget": {
    "src/linearvesting/LinearVesting.sol": "LinearVesting"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 20000
  },
  "remappings": []
}