LazyPresale

// Sources flattened with hardhat v3.0.7 https://hardhat.org


// File npm/@chainlink/contracts@1.5.0/src/v0.8/shared/interfaces/AggregatorV3Interface.sol

// Original license: SPDX_License_Identifier: MIT
pragma solidity ^0.8.0;

// solhint-disable-next-line interface-starts-with-i
interface AggregatorV3Interface {
  function decimals() external view returns (uint8);

  function description() external view returns (string memory);

  function version() external view returns (uint256);

  function getRoundData(
    uint80 _roundId
  ) external view returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound);

  function latestRoundData()
    external
    view
    returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound);
}


// File npm/@openzeppelin/contracts@5.4.0/utils/Context.sol

// Original license: 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;
    }
}

// File npm/@openzeppelin/contracts@5.4.0/access/Ownable.sol

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

/**
 * @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);
    }
}




// File npm/@openzeppelin/contracts@5.4.0/access/Ownable2Step.sol

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.20;

/**
 * @dev Contract module which provides access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * This extension of the {Ownable} contract includes a two-step mechanism to transfer
 * ownership, where the new owner must call {acceptOwnership} in order to replace the
 * old one. This can help prevent common mistakes, such as transfers of ownership to
 * incorrect accounts, or to contracts that are unable to interact with the
 * permission system.
 *
 * The initial owner is specified at deployment time in the constructor for `Ownable`. This
 * can later be changed with {transferOwnership} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;

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

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

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     *
     * Setting `newOwner` to the zero address is allowed; this can be used to cancel an initiated ownership transfer.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        address sender = _msgSender();
        if (pendingOwner() != sender) {
            revert OwnableUnauthorizedAccount(sender);
        }
        _transferOwnership(sender);
    }
}


// File npm/@openzeppelin/contracts@5.4.0/token/ERC20/IERC20.sol

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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);
}


// File npm/@openzeppelin/contracts@5.4.0/token/ERC20/utils/SafeERC20.sol

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;


/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 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 {
    /**
     * @dev An operation with an ERC-20 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 Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(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.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    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.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    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.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    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 Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            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 {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            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 silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}


// File npm/@openzeppelin/contracts@5.4.0/interfaces/IERC1363.sol

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC1363.sol)

pragma solidity >=0.6.2;


pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[ERC section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}


// File npm/@openzeppelin/contracts@5.4.0/interfaces/IERC165.sol

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC165.sol)

pragma solidity >=0.4.16;


// File npm/@openzeppelin/contracts@5.4.0/utils/introspection/IERC165.sol

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (utils/introspection/IERC165.sol)




// File npm/@openzeppelin/contracts@5.4.0/interfaces/IERC20.sol

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC20.sol)

pragma solidity >=0.4.16;


// File npm/@openzeppelin/contracts@5.4.0/utils/Pausable.sol

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (utils/Pausable.sol)

pragma solidity ^0.8.20;

/**
 * @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 {
    bool private _paused;

    /**
     * @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);

    /**
     * @dev The operation failed because the contract is paused.
     */
    error EnforcedPause();

    /**
     * @dev The operation failed because the contract is not paused.
     */
    error ExpectedPause();

    /**
     * @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 {
        if (paused()) {
            revert EnforcedPause();
        }
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        if (!paused()) {
            revert ExpectedPause();
        }
    }

    /**
     * @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());
    }
}


// File npm/@openzeppelin/contracts@5.4.0/utils/ReentrancyGuard.sol

// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (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 EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * 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

// File contracts/LazyPresale.sol

// Original license: SPDX_License_Identifier: MIT
pragma solidity ^0.8.20;






/**
 * @title Lazy Token Presale Contract
 * @dev Manages multiple presale stages for Lazy Token with different payment methods (ETH, USDC, USDT)
 */
contract LazyPresale is Ownable2Step, Pausable, ReentrancyGuard {
    uint256 public constant PRECISION = 1e18; // Internal calculations
    uint256 public constant PRICE_DECIMALS = 1e18; // Stage prices
    uint256 public constant ETH_DECIMALS = 1e18; // ETH decimals
    uint256 public constant USDC_DECIMALS = 1e6; // USDC decimals
    uint256 public constant USDT_DECIMALS = 1e6; // USDT decimals
    uint256 public constant CHAINLINK_DECIMALS = 1e8; // Chainlink decimals

    // Conversion factors
    uint256 public constant USDC_TO_PRECISION = PRECISION / USDC_DECIMALS; // 1e12
    uint256 public constant USDT_TO_PRECISION = PRECISION / USDT_DECIMALS; // 1e12

    uint256 public constant CHAINLINK_TO_PRECISION =
        PRECISION / CHAINLINK_DECIMALS; // 1e10

    using SafeERC20 for IERC20;

    // Constants
    address public constant ETH_ADDRESS =
        address(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);

    // Token and payment addresses
    address public usdcAddress;
    address public usdtAddress;
    address public ethReceiver;
    address public lazyToken;
    AggregatorV3Interface public ethPriceFeed;

    // State variables
    uint8 public currentStageId;
    bool public claimingEnabled = false;
    uint256 public totalTokensSold;
    uint256 public priceFeedStalenessThreshold;
    uint256 public maxTokensPerUser;

    // Per-user tracking
    mapping(address => uint256) public purchasedTokens;
    mapping(address => bool) public hasClaimed;
    mapping(address => mapping(address => uint256)) public contributions;
    mapping(address => uint256) public totalContributionsByToken;

    // Stage structure
    struct Stage {
        string name;
        uint256 price; // Price in USD with 18 decimals (e.g. $0.035 = 35000000000000000)
        uint256 tokenAllocation;
        uint256 tokensSold;
        bool active;
    }

    // Stages mapping
    mapping(uint8 => Stage) public stages;

    // Events
    event Contribution(
        address indexed user,
        address indexed token,
        uint256 amount,
        uint256 tokensAllocated,
        uint8 indexed stageId,
        uint256 timestamp
    );
    event StageChanged(uint8 oldStageId, uint8 newStageId);
    event ClaimingEnabled();
    event TokensClaimed(address indexed user, uint256 amount);
    event TokenSet(address indexed lazyToken);
    event ERC20Withdrawn(
        address indexed token,
        address indexed to,
        uint256 amount
    );

    /**
     * @dev Constructor sets initial values
     * @param _usdc Address of USDC token
     * @param _usdt Address of USDT token
     * @param _ethReceiver Address to receive ETH contributions
     * @param _priceFeed Chainlink ETH/USD price feed
     */
    constructor(
        address _usdc,
        address _usdt,
        address _ethReceiver,
        address _priceFeed
    ) Ownable(msg.sender) {
        require(_usdc != address(0), "Invalid USDC address");
        require(_usdt != address(0), "Invalid USDT address");
        require(_ethReceiver != address(0), "Invalid ETH receiver address");
        require(_priceFeed != address(0), "Invalid price feed address");

        usdcAddress = _usdc;
        usdtAddress = _usdt;
        ethReceiver = _ethReceiver;
        ethPriceFeed = AggregatorV3Interface(_priceFeed);
        priceFeedStalenessThreshold = 3600; // 1 hour
        maxTokensPerUser = 25000000 * PRECISION; // Default 25M tokens

        // Initialize stages (can also be done via setupStages function)
        setupDefaultStages();
    }

    /**
     * @dev Sets up default presale stages based on the 7-stage community distribution plan
     * Stage prices are in USD with 18 decimals (e.g. $0.050 = 50000000000000000)
     */

    function normalizeUSDCAmount(
        uint256 usdcAmount
    ) public pure returns (uint256) {
        return usdcAmount * USDC_TO_PRECISION;
    }

    function normalizeUSDTAmount(
        uint256 usdtAmount
    ) public pure returns (uint256) {
        return usdtAmount * USDT_TO_PRECISION;
    }

    function setupDefaultStages() private {
        stages[0] = Stage({
            name: "Early Bird",
            price: 500000000000000, // $0.0005
            tokenAllocation: 500000000 * PRECISION, // 500M tokens
            tokensSold: 0,
            active: true
        });

        stages[1] = Stage({
            name: "Stage 1",
            price: 700000000000000, // $0.0007
            tokenAllocation: 650000000 * PRECISION, // 650M tokens
            tokensSold: 0,
            active: false
        });

        stages[2] = Stage({
            name: "Stage 2",
            price: 900000000000000, // $0.0009
            tokenAllocation: 800000000 * PRECISION, // 800M tokens
            tokensSold: 0,
            active: false
        });

        stages[3] = Stage({
            name: "Stage 3",
            price: 1100000000000000, // $0.0011
            tokenAllocation: 950000000 * PRECISION, // 950M tokens
            tokensSold: 0,
            active: false
        });

        stages[4] = Stage({
            name: "Stage 4",
            price: 1300000000000000, // $0.0013
            tokenAllocation: 1100000000 * PRECISION, // 1.1B tokens
            tokensSold: 0,
            active: false
        });

        stages[5] = Stage({
            name: "Stage 5",
            price: 1500000000000000, // $0.0015
            tokenAllocation: 1250000000 * PRECISION, // 1.25B tokens
            tokensSold: 0,
            active: false
        });

        stages[6] = Stage({
            name: "Stage 6",
            price: 1700000000000000, // $0.0017
            tokenAllocation: 1400000000 * PRECISION, // 1.4B tokens
            tokensSold: 0,
            active: false
        });

        stages[7] = Stage({
            name: "Stage 7",
            price: 1900000000000000, // $0.0019
            tokenAllocation: 1550000000 * PRECISION, // 1.55B tokens
            tokensSold: 0,
            active: false
        });

        stages[8] = Stage({
            name: "Stage 8",
            price: 2100000000000000, // $0.0021
            tokenAllocation: 1700000000 * PRECISION, // 1.7B tokens
            tokensSold: 0,
            active: false
        });

        stages[9] = Stage({
            name: "Stage 9",
            price: 2300000000000000, // $0.0023
            tokenAllocation: 1850000000 * PRECISION, // 1.85B tokens
            tokensSold: 0,
            active: false
        });

        stages[10] = Stage({
            name: "Final Call (The Laziest Mfers)",
            price: 2540000000000000, // $0.00254
            tokenAllocation: 1000000000 * PRECISION, // 1B tokens
            tokensSold: 0,
            active: false
        });

        currentStageId = 0; // Start with Early Bird stage
    }

    /**
     * @dev Set the Lazy token address
     * @param _lazyToken Address of the Lazy token
     */
    function setToken(address _lazyToken) external onlyOwner {
        require(_lazyToken != address(0), "Invalid token address");
        require(lazyToken == address(0), "Token already set");
        lazyToken = _lazyToken;
        emit TokenSet(_lazyToken);
    }

    /**
     * @dev Enable token claiming
     */
    function enableClaiming() external onlyOwner {
        require(lazyToken != address(0), "Token not set");
        claimingEnabled = true;
        emit ClaimingEnabled();
    }

    /**
     * @dev Sets the maximum token purchase limit per user
     * @param _maxTokens The new maximum token limit
     */
    function setMaxTokensPerUser(uint256 _maxTokens) external onlyOwner {
        require(_maxTokens > 0, "Max tokens must be greater than 0");
        maxTokensPerUser = _maxTokens;
    }

    /**
     * @dev Sets the price feed staleness threshold
     * @param _newThreshold The new threshold in seconds
     */
    function setPriceFeedStalenessThreshold(
        uint256 _newThreshold
    ) external onlyOwner {
        require(_newThreshold > 0, "Threshold must be greater than 0");
        priceFeedStalenessThreshold = _newThreshold;
    }

    /**
     * @dev Change to a specific presale stage
     * @param newStageId ID of the new stage
     */
    function setStage(uint8 newStageId) external onlyOwner {
        require(newStageId <= 10, "Invalid stage ID");
        require(newStageId != currentStageId, "Already in this stage");

        // Deactivate current stage
        stages[currentStageId].active = false;

        // Activate new stage
        stages[newStageId].active = true;

        emit StageChanged(currentStageId, newStageId);
        currentStageId = newStageId;
    }

    /**
     * @dev Get current ETH/USD price from Chainlink
     * @return ETH price in USD with 18 decimals
     */
    function getEthPrice() public view returns (uint256) {
        // Get latest price from Chainlink (returns price with 8 decimals)
        (
            ,
            /* uint80 roundID */ int256 price,
            ,
            /*uint256 startedAt*/ uint256 updatedAt /*uint80 answeredInRound*/,

        ) = ethPriceFeed.latestRoundData();

        require(price > 0, "Invalid ETH price");
        require(
            block.timestamp - updatedAt <= priceFeedStalenessThreshold,
            "Stale ETH price"
        );

        // Convert to 18 decimals
        return uint256(price) * CHAINLINK_TO_PRECISION;
    }

    /**
     * @dev Buy tokens with ETH
     */
    function buyWithETH(
        uint256 minTokensOut
    ) external payable nonReentrant whenNotPaused {
        require(msg.value > 0, "ETH amount must be greater than 0");
        Stage storage stage = stages[currentStageId];
        require(stage.active, "Current stage not active");

        // Calculate USD value of ETH
        uint256 ethPrice = getEthPrice();
        uint256 ethInUSD = (msg.value * ethPrice) / PRECISION;

        // Calculate token amount
        uint256 totalTokens = (ethInUSD * PRECISION) / stage.price;

        require(totalTokens >= minTokensOut, "Slippage limit exceeded");

        // Check token allocation
        require(
            stage.tokensSold + totalTokens <= stage.tokenAllocation,
            "Exceeds stage allocation"
        );

        // Check user purchase limit
        require(
            purchasedTokens[msg.sender] + totalTokens <= maxTokensPerUser,
            "Exceeds user purchase limit"
        );

        // Update token statistics
        stage.tokensSold += totalTokens;
        totalTokensSold += totalTokens;
        purchasedTokens[msg.sender] += totalTokens;
        contributions[msg.sender][ETH_ADDRESS] += msg.value;
        totalContributionsByToken[ETH_ADDRESS] += msg.value;

        // Transfer ETH to receiver
        (bool sent, ) = payable(ethReceiver).call{value: msg.value}("");
        require(sent, "ETH transfer failed");

        emit Contribution(
            msg.sender,
            ETH_ADDRESS,
            msg.value,
            totalTokens,
            currentStageId,
            block.timestamp
        );
    }

    function calculateTokensFromUSD(
        uint256 usdAmount,
        uint256 stagePrice
    ) public pure returns (uint256) {
        require(stagePrice > 0, "Invalid stage price");
        return (usdAmount * PRECISION) / stagePrice;
    }

    function _executePurchase(
        address user,
        address token,
        uint256 paymentAmount,
        uint256 tokenAmount,
        uint256 minTokensOut
    ) internal {
        require(tokenAmount >= minTokensOut, "Slippage limit exceeded");

        Stage storage stage = stages[currentStageId];

        // Check allocations
        require(
            stage.tokensSold + tokenAmount <= stage.tokenAllocation,
            "Exceeds stage allocation"
        );
        require(
            purchasedTokens[user] + tokenAmount <= maxTokensPerUser,
            "Exceeds user purchase limit"
        );

        // Update state
        stage.tokensSold += tokenAmount;
        totalTokensSold += tokenAmount;
        purchasedTokens[user] += tokenAmount;
        contributions[user][token] += paymentAmount;
        totalContributionsByToken[token] += paymentAmount;

        emit Contribution(
            user,
            token,
            paymentAmount,
            tokenAmount,
            currentStageId,
            block.timestamp
        );
    }

    /**
     * @dev Buy tokens with USDC
     * @param amount Amount of USDC (in USDC decimals - 6)
     */

    function buyWithUSDC(
        uint256 amount,
        uint256 minTokensOut
    ) external nonReentrant whenNotPaused {
        require(amount > 0, "Amount must be greater than 0");
        Stage storage stage = stages[currentStageId];
        require(stage.active, "Current stage not active");

        // Normalize USDC amount to 18 decimals
        uint256 normalizedAmount = normalizeUSDCAmount(amount);

        // Calculate token amount using precise function
        uint256 tokenAmount = calculateTokensFromUSD(
            normalizedAmount,
            stage.price
        );

        // Validate and execute purchase
        _executePurchase(
            msg.sender,
            usdcAddress,
            amount,
            tokenAmount,
            minTokensOut
        );

        // Transfer USDC from sender
        IERC20(usdcAddress).safeTransferFrom(msg.sender, address(this), amount);
    }

    /**
     * @dev Buy tokens with USDT
     * @param amount Amount of USDT (in USDT decimals - 6)
     */
    function buyWithUSDT(
        uint256 amount,
        uint256 minTokensOut
    ) external nonReentrant whenNotPaused {
        require(amount > 0, "Amount must be greater than 0");
        Stage storage stage = stages[currentStageId];
        require(stage.active, "Current stage not active");

        // Normalize USDT amount to 18 decimals
        uint256 normalizedAmount = normalizeUSDTAmount(amount);

        // Calculate token amount using precise function
        uint256 tokenAmount = calculateTokensFromUSD(
            normalizedAmount,
            stage.price
        );

        // Validate and execute purchase
        _executePurchase(
            msg.sender,
            usdtAddress,
            amount,
            tokenAmount,
            minTokensOut
        );

        // Transfer USDT from sender
        IERC20(usdtAddress).safeTransferFrom(msg.sender, address(this), amount);
    }

    /**
     * @dev Claim tokens after presale ends and claiming is enabled
     */
    function claim() external nonReentrant {
        require(claimingEnabled, "Claiming not enabled yet");
        require(purchasedTokens[msg.sender] > 0, "No tokens to claim");
        require(!hasClaimed[msg.sender], "Already claimed");

        uint256 amount = purchasedTokens[msg.sender];
        hasClaimed[msg.sender] = true;

        // Transfer tokens to user
        IERC20(lazyToken).safeTransfer(msg.sender, amount);

        emit TokensClaimed(msg.sender, amount);
    }

    /**
     * @dev Withdraw ERC20 tokens from the contract
     * @param token The token address (USDC or USDT)
     */
    function withdrawERC20(address token) external onlyOwner {
        require(
            token == usdcAddress || token == usdtAddress,
            "Unsupported token"
        );
        uint256 balance = IERC20(token).balanceOf(address(this));
        require(balance > 0, "No tokens to withdraw");

        IERC20(token).safeTransfer(msg.sender, balance);
        emit ERC20Withdrawn(token, msg.sender, balance);
    }

    /**
     * @dev Get current stage details
     * @return name Stage name
     * @return price Stage price in USD (18 decimals)
     * @return tokenAllocation Total tokens allocated to this stage
     * @return tokensSold Tokens sold in this stage
     * @return active Whether this stage is active
     */
    function getCurrentStage()
        external
        view
        returns (
            string memory name,
            uint256 price,
            uint256 tokenAllocation,
            uint256 tokensSold,
            bool active
        )
    {
        Stage memory stage = stages[currentStageId];
        return (
            stage.name,
            stage.price,
            stage.tokenAllocation,
            stage.tokensSold,
            stage.active
        );
    }

    /**
     * @dev Pause the contract
     */
    function pause() external onlyOwner {
        _pause();
    }

    /**
     * @dev Unpause the contract
     */
    function unpause() external onlyOwner {
        _unpause();
    }

    // Support existing functions for frontend compatibility

    /**
     * @dev Get contribution amount for a user and token
     * @param user The user address
     * @param token The token address (ETH, USDC, or USDT)
     * @return The contribution amount
     */
    function getContribution(
        address user,
        address token
    ) external view returns (uint256) {
        require(
            token == ETH_ADDRESS ||
                token == usdcAddress ||
                token == usdtAddress,
            "Unsupported token"
        );
        return contributions[user][token];
    }

    /**
     * @dev Get total contributions for a token
     * @param token The token address (ETH, USDC, or USDT)
     * @return The total contribution amount
     */
    function totalContributions(address token) external view returns (uint256) {
        require(
            token == ETH_ADDRESS ||
                token == usdcAddress ||
                token == usdtAddress,
            "Unsupported token"
        );
        return totalContributionsByToken[token];
    }
}