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// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.24;

import './ITokenPresale.sol';
import '@chainlink/contracts/src/v0.8/shared/interfaces/AggregatorV3Interface.sol';
import '@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/utils/PausableUpgradeable.sol';
import '@uniswap/lib/contracts/libraries/TransferHelper.sol';

interface IERC20 {
    function decimals() external view returns (uint8);
}

// @notice A contract for handling the token presale, supporting payments in native coins and USD ERC20 tokens.
contract TokenPresale is PausableUpgradeable, OwnableUpgradeable, ITokenPresale {
    uint256 constant FULL_PERCENT = 100;
    uint256 constant TOKEN_BASE = 1e18;
    uint256 constant USD_BASE = 1e6;
    uint256 constant NATIVE_COIN_PRICE_TO_USD_CONVERSION_FACTOR = 1e20;

    AggregatorV3Interface public nativeCoinPriceFeed;
    mapping(address => uint256) public paymentTokensBases;

    uint128 public tokenPrice;

    uint128 public totalCollectedUSD;
    address public treasury;

    mapping(address => uint256) internal _balances;
    mapping(bytes32 => uint256) internal _discounts;
    mapping(address => bool) internal _maintainers;

    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor() {
        _disableInitializers();
    }

    /**
     * @param nativeCoinPriceFeed_ Price feed for the native currency.
     * @param paymentTokens_ Array of accepted USD ERC20 tokens for payment.
     * @param tokenPrice_ Initial price of 1 token in USD, scaled by 1e6.
     * @param treasury_ Address of the treasury to receive payments.
     * @param owner_ The contract owner address.
     */
    function initialize(
        AggregatorV3Interface nativeCoinPriceFeed_,
        address[] calldata paymentTokens_,
        uint128 tokenPrice_,
        address treasury_,
        address owner_
    ) external initializer {
        if (tokenPrice_ == 0) revert InvalidPrice();

        __Ownable_init(owner_);
        _pause();

        nativeCoinPriceFeed = nativeCoinPriceFeed_;
        tokenPrice = tokenPrice_;
        treasury = treasury_;

        for (uint256 i = 0; i < paymentTokens_.length; i++) {
            _addPaymentToken(paymentTokens_[i]);
        }
    }

    /**
     * @notice Owner: Pauses the presale, preventing purchases.
     */
    function pause() external onlyOwner {
        _pause();
    }

    /**
     * @notice Owner: Unpauses the presale, allowing purchases.
     */
    function unpause() external onlyOwner {
        _unpause();
    }

    /**
     * @notice Owner: Credits a recipient with tokens from an external purchase.
     * @param recipient Address receiving the purchased tokens.
     * @param purchasedTokens Amount of tokens purchased.
     * @param paidUSD The amount of the USD used for the purchase, scaled by 1e6;
     * @param paymentDetails Additional details of the payment.
     */
    function creditExternalPurchase(
        address recipient,
        uint256 purchasedTokens,
        uint128 paidUSD,
        bytes[] calldata paymentDetails
    ) external onlyOwner {
        _balances[recipient] += purchasedTokens;
        totalCollectedUSD += paidUSD;

        emit ExternallyPurchased(recipient, purchasedTokens, paidUSD, paymentDetails);
    }

    /**
     * @notice Owner: Updates the discount codes and their corresponding discount percentages.
     * @param data An array of `DiscountCodeData` structs containing discount code hashes and their associated discount percentages [0-99].
     */
    function updateDiscountCodes(DiscountCodeData[] calldata data) external onlyOwner {
        uint256 numOfCodes = data.length;

        for (uint256 i; i < numOfCodes; ++i) {
            if (data[i].discount >= FULL_PERCENT) revert InvalidDiscount();
            _discounts[data[i].discountCodeHash] = data[i].discount;
        }
    }

    /**
     * @notice Owner: Updates the maintainer status of a given account.
     * @param account The address of the account whose maintainer status is being updated.
     * @param isMaintainer Whether the account should be a maintainer or not.
     */
    function updateMaintainerStatus(address account, bool isMaintainer) external onlyOwner {
        if (_maintainers[account] == isMaintainer) revert NoChange();

        _maintainers[account] = isMaintainer;

        emit MaintainerUpdated(account, isMaintainer);
    }

    /**
     * @notice Owner: Updates the address of the price feed for the native currency.
     * @param newNativeCoinPriceFeed The new address of the price feed for the native currency.
     */
    function updateNativeCoinPriceFeed(address newNativeCoinPriceFeed) external onlyOwner {
        nativeCoinPriceFeed = AggregatorV3Interface(newNativeCoinPriceFeed);
    }

    /**
     * @notice Owner: Updates the status of an ERC20 token as a valid payment method.
     * @param token The token address to update.
     * @param isPaymentToken Whether the token is accepted for payment.
     */
    function updateTokenStatus(address token, bool isPaymentToken) external onlyOwner {
        if (bool(paymentTokensBases[token] != 0) == isPaymentToken) revert NoChange();

        if (isPaymentToken) {
            _addPaymentToken(token);
        } else {
            paymentTokensBases[token] = 0;
        }

        emit TokenStatusUpdated(token, isPaymentToken);
    }

    /**
     * @notice Owner: Updates the treasury address where payments are sent.
     * @param newTreasury The new treasury address.
     */
    function updateTreasuryAddress(address newTreasury) external onlyOwner {
        if (treasury == newTreasury) revert NoChange();

        treasury = newTreasury;

        emit TreasuryAddressUpdated(newTreasury);
    }

    /**
     * @notice Owner/Maintainer: Updates the price of the token.
     * @param newPrice The new price for Token in USD, scaled by 1e6.
     */
    function updateTokenPrice(uint128 newPrice) external {
        if (msg.sender != owner() && !_maintainers[msg.sender]) revert OnlyMaintainer();
        if (newPrice == tokenPrice) revert NoChange();
        if (newPrice == 0) revert InvalidPrice();

        tokenPrice = newPrice;

        emit TokenPriceUpdated(newPrice);
    }

    /**
     * @notice Purchase tokens using native currency.
     * @param recipient The address receiving the purchased tokens.
     * @param discountCode The discount code applied to the purchase.
     */
    function purchaseWithNativeCoin(address recipient, string calldata discountCode) external payable whenNotPaused {
        TransferHelper.safeTransferETH(treasury, msg.value);

        (, int256 nativeCoinPrice, , , ) = nativeCoinPriceFeed.latestRoundData();
        uint256 paidUSD = (msg.value * uint256(nativeCoinPrice)) / NATIVE_COIN_PRICE_TO_USD_CONVERSION_FACTOR;
        uint256 purchasedTokens = _processPurchase(recipient, paidUSD, discountCode);

        emit Purchased(msg.sender, recipient, address(0), msg.value, purchasedTokens, paidUSD, discountCode);
    }

    /**
     * @notice Purchase tokens using an ERC20 token.
     * @param recipient The address receiving the purchased tokens.
     * @param paymentToken The ERC20 token used for payment.
     * @param paymentAmount The amount of the token used for the purchase.
     * @param discountCode The discount code applied to the purchase.
     */
    function purchaseWithToken(
        address recipient,
        address paymentToken,
        uint256 paymentAmount,
        string calldata discountCode
    ) external whenNotPaused {
        uint256 paymentTokenBase = paymentTokensBases[paymentToken];
        if (paymentTokenBase == 0) revert InvalidPaymentToken();

        TransferHelper.safeTransferFrom(paymentToken, msg.sender, treasury, paymentAmount);

        uint256 paidUSD = (paymentAmount * USD_BASE) / paymentTokenBase;
        uint256 purchasedTokens = _processPurchase(recipient, paidUSD, discountCode);

        emit Purchased(msg.sender, recipient, paymentToken, paymentAmount, purchasedTokens, paidUSD, discountCode);
    }

    /**
     * @notice Returns the balance of tokens for `account`.
     */
    function balanceOf(address account) external view returns (uint256) {
        return _balances[account];
    }

    /**
     * @notice Returns the current price of 1 token in native currency.
     * @return The price of 1 token in native coin.
     */
    function tokenPriceInNativeCoin() external view returns (uint256) {
        (, int256 nativeCoinPrice, , , ) = nativeCoinPriceFeed.latestRoundData();
        return (tokenPrice * NATIVE_COIN_PRICE_TO_USD_CONVERSION_FACTOR) / uint256(nativeCoinPrice);
    }

    /**
     * @notice Adds an ERC20 token to the list of accepted payment tokens.
     * @param paymentToken The ERC20 token to add.
     */
    function _addPaymentToken(address paymentToken) internal {
        uint256 paymentTokenDecimals = IERC20(paymentToken).decimals();
        if (paymentTokenDecimals == 0) revert ZeroDecimalsPaymentToken();

        paymentTokensBases[paymentToken] = 10 ** paymentTokenDecimals;
    }

    /**
     * @notice Processes the purchase and calculates the amount of tokens to credit.
     * @param recipient The address receiving the purchased tokens.
     * @param paidUSD The amount of USD used for the purchase, scaled by 1e6.
     * @param discountCode The discount code applied to the purchase.
     * @return The amount of tokens credited to the recipient.
     */
    function _processPurchase(
        address recipient,
        uint256 paidUSD,
        string calldata discountCode
    ) internal returns (uint256) {
        uint256 discount = _discounts[keccak256(abi.encodePacked(discountCode))];

        uint256 purchasedTokens = ((paidUSD * TOKEN_BASE) * FULL_PERCENT) / (tokenPrice * (FULL_PERCENT - discount));

        if (purchasedTokens == 0) revert InsufficientPurchase();

        totalCollectedUSD += uint128(paidUSD);
        _balances[recipient] += purchasedTokens;

        return purchasedTokens;
    }
}

// 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);
}

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

pragma solidity ^0.8.20;

import {ContextUpgradeable} from "../utils/ContextUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    /// @custom:storage-location erc7201:openzeppelin.storage.Ownable
    struct OwnableStorage {
        address _owner;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Ownable")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant OwnableStorageLocation = 0x9016d09d72d40fdae2fd8ceac6b6234c7706214fd39c1cd1e609a0528c199300;

    function _getOwnableStorage() private pure returns (OwnableStorage storage $) {
        assembly {
            $.slot := OwnableStorageLocation
        }
    }

    /**
     * @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.
     */
    function __Ownable_init(address initialOwner) internal onlyInitializing {
        __Ownable_init_unchained(initialOwner);
    }

    function __Ownable_init_unchained(address initialOwner) internal onlyInitializing {
        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) {
        OwnableStorage storage $ = _getOwnableStorage();
        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 {
        OwnableStorage storage $ = _getOwnableStorage();
        address oldOwner = $._owner;
        $._owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

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

pragma solidity ^0.8.20;

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Storage of the initializable contract.
     *
     * It's implemented on a custom ERC-7201 namespace to reduce the risk of storage collisions
     * when using with upgradeable contracts.
     *
     * @custom:storage-location erc7201:openzeppelin.storage.Initializable
     */
    struct InitializableStorage {
        /**
         * @dev Indicates that the contract has been initialized.
         */
        uint64 _initialized;
        /**
         * @dev Indicates that the contract is in the process of being initialized.
         */
        bool _initializing;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Initializable")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant INITIALIZABLE_STORAGE = 0xf0c57e16840df040f15088dc2f81fe391c3923bec73e23a9662efc9c229c6a00;

    /**
     * @dev The contract is already initialized.
     */
    error InvalidInitialization();

    /**
     * @dev The contract is not initializing.
     */
    error NotInitializing();

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint64 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that in the context of a constructor an `initializer` may be invoked any
     * number of times. This behavior in the constructor can be useful during testing and is not expected to be used in
     * production.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        // Cache values to avoid duplicated sloads
        bool isTopLevelCall = !$._initializing;
        uint64 initialized = $._initialized;

        // Allowed calls:
        // - initialSetup: the contract is not in the initializing state and no previous version was
        //                 initialized
        // - construction: the contract is initialized at version 1 (no reininitialization) and the
        //                 current contract is just being deployed
        bool initialSetup = initialized == 0 && isTopLevelCall;
        bool construction = initialized == 1 && address(this).code.length == 0;

        if (!initialSetup && !construction) {
            revert InvalidInitialization();
        }
        $._initialized = 1;
        if (isTopLevelCall) {
            $._initializing = true;
        }
        _;
        if (isTopLevelCall) {
            $._initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: Setting the version to 2**64 - 1 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint64 version) {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing || $._initialized >= version) {
            revert InvalidInitialization();
        }
        $._initialized = version;
        $._initializing = true;
        _;
        $._initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        _checkInitializing();
        _;
    }

    /**
     * @dev Reverts if the contract is not in an initializing state. See {onlyInitializing}.
     */
    function _checkInitializing() internal view virtual {
        if (!_isInitializing()) {
            revert NotInitializing();
        }
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing) {
            revert InvalidInitialization();
        }
        if ($._initialized != type(uint64).max) {
            $._initialized = type(uint64).max;
            emit Initialized(type(uint64).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint64) {
        return _getInitializableStorage()._initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _getInitializableStorage()._initializing;
    }

    /**
     * @dev Returns a pointer to the storage namespace.
     */
    // solhint-disable-next-line var-name-mixedcase
    function _getInitializableStorage() private pure returns (InitializableStorage storage $) {
        assembly {
            $.slot := INITIALIZABLE_STORAGE
        }
    }
}

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

pragma solidity ^0.8.20;
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

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

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

pragma solidity ^0.8.20;

import {ContextUpgradeable} from "../utils/ContextUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.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 PausableUpgradeable is Initializable, ContextUpgradeable {
    /// @custom:storage-location erc7201:openzeppelin.storage.Pausable
    struct PausableStorage {
        bool _paused;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Pausable")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant PausableStorageLocation = 0xcd5ed15c6e187e77e9aee88184c21f4f2182ab5827cb3b7e07fbedcd63f03300;

    function _getPausableStorage() private pure returns (PausableStorage storage $) {
        assembly {
            $.slot := PausableStorageLocation
        }
    }

    /**
     * @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 Initializes the contract in unpaused state.
     */
    function __Pausable_init() internal onlyInitializing {
        __Pausable_init_unchained();
    }

    function __Pausable_init_unchained() internal onlyInitializing {
        PausableStorage storage $ = _getPausableStorage();
        $._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) {
        PausableStorage storage $ = _getPausableStorage();
        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 {
        PausableStorage storage $ = _getPausableStorage();
        $._paused = true;
        emit Paused(_msgSender());
    }

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

// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.6.0;

// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeApprove: approve failed'
        );
    }

    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeTransfer: transfer failed'
        );
    }

    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::transferFrom: transferFrom failed'
        );
    }

    function safeTransferETH(address to, uint256 value) internal {
        (bool success, ) = to.call{value: value}(new bytes(0));
        require(success, 'TransferHelper::safeTransferETH: ETH transfer failed');
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.24;

interface ITokenPresale {
    struct DiscountCodeData {
        bytes32 discountCodeHash;
        uint256 discount;
    }

    event ExternallyPurchased(
        address indexed recipient,
        uint256 purchasedTokens,
        uint128 paidUSD,
        bytes[] paymentDetails
    );
    event MaintainerUpdated(address account, bool isMaintainer);
    event Purchased(
        address indexed purchaseer,
        address indexed recipient,
        address indexed paymentToken,
        uint256 paymentAmount,
        uint256 purchasedTokens,
        uint256 paidUSD,
        string discountCode
    );
    event TokenStatusUpdated(address token, bool isPaymentToken);
    event TreasuryAddressUpdated(address newTreasury);
    event TokenPriceUpdated(uint256 newPrice);

    error InsufficientPurchase();
    error InvalidDiscount();
    error InvalidPaymentToken();
    error InvalidPrice();
    error NoChange();
    error OnlyMaintainer();
    error ZeroDecimalsPaymentToken();

    function pause() external;
    function unpause() external;

    function creditExternalPurchase(
        address recipient,
        uint256 purchasedTokens,
        uint128 paidUSD,
        bytes[] calldata paymentDetails
    ) external;

    function updateDiscountCodes(DiscountCodeData[] calldata data) external;

    function updateMaintainerStatus(address account, bool isMaintainer) external;

    function updateTokenStatus(address token, bool isPaymentToken) external;

    function updateTreasuryAddress(address newTreasury) external;

    function updateTokenPrice(uint128 newPrice) external;

    function purchaseWithNativeCoin(address recipient, string calldata discountCode) external payable;

    function purchaseWithToken(
        address recipient,
        address paymentToken,
        uint256 paymentAmount,
        string calldata discountCode
    ) external;

    function balanceOf(address account) external view returns (uint256);

    function tokenPriceInNativeCoin() external view returns (uint256);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"EnforcedPause","type":"error"},{"inputs":[],"name":"ExpectedPause","type":"error"},{"inputs":[],"name":"InsufficientPurchase","type":"error"},{"inputs":[],"name":"InvalidDiscount","type":"error"},{"inputs":[],"name":"InvalidInitialization","type":"error"},{"inputs":[],"name":"InvalidPaymentToken","type":"error"},{"inputs":[],"name":"InvalidPrice","type":"error"},{"inputs":[],"name":"NoChange","type":"error"},{"inputs":[],"name":"NotInitializing","type":"error"},{"inputs":[],"name":"OnlyMaintainer","type":"error"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"OwnableInvalidOwner","type":"error"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"OwnableUnauthorizedAccount","type":"error"},{"inputs":[],"name":"ZeroDecimalsPaymentToken","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"uint256","name":"purchasedTokens","type":"uint256"},{"indexed":false,"internalType":"uint128","name":"paidUSD","type":"uint128"},{"indexed":false,"internalType":"bytes[]","name":"paymentDetails","type":"bytes[]"}],"name":"ExternallyPurchased","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint64","name":"version","type":"uint64"}],"name":"Initialized","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"bool","name":"isMaintainer","type":"bool"}],"name":"MaintainerUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"purchaseer","type":"address"},{"indexed":true,"internalType":"address","name":"recipient","type":"address"},{"indexed":true,"internalType":"address","name":"paymentToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"paymentAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"purchasedTokens","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"paidUSD","type":"uint256"},{"indexed":false,"internalType":"string","name":"discountCode","type":"string"}],"name":"Purchased","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"newPrice","type":"uint256"}],"name":"TokenPriceUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"bool","name":"isPaymentToken","type":"bool"}],"name":"TokenStatusUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"newTreasury","type":"address"}],"name":"TreasuryAddressUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"purchasedTokens","type":"uint256"},{"internalType":"uint128","name":"paidUSD","type":"uint128"},{"internalType":"bytes[]","name":"paymentDetails","type":"bytes[]"}],"name":"creditExternalPurchase","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract AggregatorV3Interface","name":"nativeCoinPriceFeed_","type":"address"},{"internalType":"address[]","name":"paymentTokens_","type":"address[]"},{"internalType":"uint128","name":"tokenPrice_","type":"uint128"},{"internalType":"address","name":"treasury_","type":"address"},{"internalType":"address","name":"owner_","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"nativeCoinPriceFeed","outputs":[{"internalType":"contract AggregatorV3Interface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"paymentTokensBases","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"string","name":"discountCode","type":"string"}],"name":"purchaseWithNativeCoin","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"address","name":"paymentToken","type":"address"},{"internalType":"uint256","name":"paymentAmount","type":"uint256"},{"internalType":"string","name":"discountCode","type":"string"}],"name":"purchaseWithToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"tokenPrice","outputs":[{"internalType":"uint128","name":"","type":"uint128"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenPriceInNativeCoin","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalCollectedUSD","outputs":[{"internalType":"uint128","name":"","type":"uint128"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"treasury","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"discountCodeHash","type":"bytes32"},{"internalType":"uint256","name":"discount","type":"uint256"}],"internalType":"struct ITokenPresale.DiscountCodeData[]","name":"data","type":"tuple[]"}],"name":"updateDiscountCodes","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"bool","name":"isMaintainer","type":"bool"}],"name":"updateMaintainerStatus","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newNativeCoinPriceFeed","type":"address"}],"name":"updateNativeCoinPriceFeed","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint128","name":"newPrice","type":"uint128"}],"name":"updateTokenPrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"bool","name":"isPaymentToken","type":"bool"}],"name":"updateTokenStatus","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newTreasury","type":"address"}],"name":"updateTreasuryAddress","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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