// File: @thirdweb-dev/contracts/base/ERC20Drop.sol



// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

/// @author thirdweb

import "../openzeppelin-presets/token/ERC20/extensions/ERC20Permit.sol";

import "../extension/ContractMetadata.sol";
import "../extension/Multicall.sol";
import "../extension/Ownable.sol";
import "../extension/PrimarySale.sol";
import "../extension/DropSinglePhase.sol";
import "../extension/interface/IBurnableERC20.sol";

import "../lib/CurrencyTransferLib.sol";

/**
 *      BASE:      ERC20
 *      EXTENSION: DropSinglePhase
 *
 *  The `ERC20Drop` smart contract implements the ERC20 standard.
 *  It includes the following additions to standard ERC20 logic:
 *
 *      - Ownership of the contract, with the ability to restrict certain functions to
 *        only be called by the contract's owner.
 *
 *      - Multicall capability to perform multiple actions atomically
 *
 *      - EIP 2612 compliance: See {ERC20-permit} method, which can be used to change an account's ERC20 allowance by
 *                             presenting a message signed by the account.
 *
 *  The `drop` mechanism in the `DropSinglePhase` extension is a distribution mechanism for tokens. It lets
 *  you set restrictions such as a price to charge, an allowlist etc. when an address atttempts to mint tokens.
 *
 */

contract ERC20Drop is ContractMetadata, Multicall, Ownable, ERC20Permit, PrimarySale, DropSinglePhase, IBurnableERC20 {
    /*//////////////////////////////////////////////////////////////
                            Constructor
    //////////////////////////////////////////////////////////////*/

    constructor(
        address _defaultAdmin,
        string memory _name,
        string memory _symbol,
        address _primarySaleRecipient
    ) ERC20Permit(_name, _symbol) {
        _setupOwner(_defaultAdmin);
        _setupPrimarySaleRecipient(_primarySaleRecipient);
    }

    /*//////////////////////////////////////////////////////////////
                            ERC20 logic
    //////////////////////////////////////////////////////////////*/

    /**
     *  @notice          Lets an owner a given amount of their tokens.
     *  @dev             Caller should own the `_amount` of tokens.
     *
     *  @param _amount   The number of tokens to burn.
     */
    function burn(uint256 _amount) external virtual {
        require(balanceOf(msg.sender) >= _amount, "not enough balance");
        _burn(msg.sender, _amount);
    }

    /**
     *  @notice          Lets an owner burn a given amount of an account's tokens.
     *  @dev             `_account` should own the `_amount` of tokens.
     *
     *  @param _account  The account to burn tokens from.
     *  @param _amount   The number of tokens to burn.
     */
    function burnFrom(address _account, uint256 _amount) external virtual override {
        require(_canBurn(), "Not authorized to burn.");
        require(balanceOf(_account) >= _amount, "not enough balance");
        uint256 decreasedAllowance = allowance(_account, msg.sender) - _amount;
        _approve(_account, msg.sender, 0);
        _approve(_account, msg.sender, decreasedAllowance);
        _burn(_account, _amount);
    }

    /*//////////////////////////////////////////////////////////////
                        Internal (overrideable) functions
    //////////////////////////////////////////////////////////////*/

    /// @dev Collects and distributes the primary sale value of tokens being claimed.
    function _collectPriceOnClaim(
        address _primarySaleRecipient,
        uint256 _quantityToClaim,
        address _currency,
        uint256 _pricePerToken
    ) internal virtual override {
        if (_pricePerToken == 0) {
            return;
        }

        uint256 totalPrice = (_quantityToClaim * _pricePerToken) / 1 ether;
        require(totalPrice > 0, "quantity too low");

        if (_currency == CurrencyTransferLib.NATIVE_TOKEN) {
            require(msg.value == totalPrice, "Must send total price.");
        }

        address saleRecipient = _primarySaleRecipient == address(0) ? primarySaleRecipient() : _primarySaleRecipient;
        CurrencyTransferLib.transferCurrency(_currency, msg.sender, saleRecipient, totalPrice);
    }

    /// @dev Transfers the tokens being claimed.
    function _transferTokensOnClaim(address _to, uint256 _quantityBeingClaimed)
        internal
        virtual
        override
        returns (uint256)
    {
        _mint(_to, _quantityBeingClaimed);
        return 0;
    }

    /// @dev Checks whether platform fee info can be set in the given execution context.
    function _canSetClaimConditions() internal view virtual override returns (bool) {
        return msg.sender == owner();
    }

    /// @dev Returns whether contract metadata can be set in the given execution context.
    function _canSetContractURI() internal view virtual override returns (bool) {
        return msg.sender == owner();
    }

    /// @dev Returns whether tokens can be minted in the given execution context.
    function _canMint() internal view virtual returns (bool) {
        return msg.sender == owner();
    }

    /// @dev Returns whether tokens can be burned in the given execution context.
    function _canBurn() internal view virtual returns (bool) {
        return msg.sender == owner();
    }

    /// @dev Returns whether owner can be set in the given execution context.
    function _canSetOwner() internal view virtual override returns (bool) {
        return msg.sender == owner();
    }

    /// @dev Returns whether primary sale recipient can be set in the given execution context.
    function _canSetPrimarySaleRecipient() internal view virtual override returns (bool) {
        return msg.sender == owner();
    }
}

// File: @thirdweb-dev/contracts/eip/interface/IERC20.sol



// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
interface IERC20 {
    function totalSupply() external view returns (uint256);

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

    function allowance(address owner, address spender) external view returns (uint256);

    function transfer(address to, uint256 value) external returns (bool);

    function approve(address spender, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: @thirdweb-dev/contracts/eip/interface/IERC20Metadata.sol



// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

/**
 * @title ERC20Metadata interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
interface IERC20Metadata {
    function name() external view returns (string memory);

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

    function decimals() external view returns (uint8);
}

// File: @thirdweb-dev/contracts/eip/interface/IERC20Permit.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-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.
 */
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].
     */
    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);
}

// File: @thirdweb-dev/contracts/extension/ContractMetadata.sol



// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

/// @author thirdweb

import "./interface/IContractMetadata.sol";

/**
 *  @title   Contract Metadata
 *  @notice  Thirdweb's `ContractMetadata` is a contract extension for any base contracts. It lets you set a metadata URI
 *           for you contract.
 *           Additionally, `ContractMetadata` is necessary for NFT contracts that want royalties to get distributed on OpenSea.
 */

abstract contract ContractMetadata is IContractMetadata {
    /// @notice Returns the contract metadata URI.
    string public override contractURI;

    /**
     *  @notice         Lets a contract admin set the URI for contract-level metadata.
     *  @dev            Caller should be authorized to setup contractURI, e.g. contract admin.
     *                  See {_canSetContractURI}.
     *                  Emits {ContractURIUpdated Event}.
     *
     *  @param _uri     keccak256 hash of the role. e.g. keccak256("TRANSFER_ROLE")
     */
    function setContractURI(string memory _uri) external override {
        if (!_canSetContractURI()) {
            revert("Not authorized");
        }

        _setupContractURI(_uri);
    }

    /// @dev Lets a contract admin set the URI for contract-level metadata.
    function _setupContractURI(string memory _uri) internal {
        string memory prevURI = contractURI;
        contractURI = _uri;

        emit ContractURIUpdated(prevURI, _uri);
    }

    /// @dev Returns whether contract metadata can be set in the given execution context.
    function _canSetContractURI() internal view virtual returns (bool);
}

// File: @thirdweb-dev/contracts/extension/DropSinglePhase.sol



// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

/// @author thirdweb

import "./interface/IDropSinglePhase.sol";
import "../lib/MerkleProof.sol";

abstract contract DropSinglePhase is IDropSinglePhase {
    /*///////////////////////////////////////////////////////////////
                            State variables
    //////////////////////////////////////////////////////////////*/

    /// @dev The active conditions for claiming tokens.
    ClaimCondition public claimCondition;

    /// @dev The ID for the active claim condition.
    bytes32 private conditionId;

    /*///////////////////////////////////////////////////////////////
                                Mappings
    //////////////////////////////////////////////////////////////*/

    /**
     *  @dev Map from a claim condition uid and account to supply claimed by account.
     */
    mapping(bytes32 => mapping(address => uint256)) private supplyClaimedByWallet;

    /*///////////////////////////////////////////////////////////////
                            Drop logic
    //////////////////////////////////////////////////////////////*/

    /// @dev Lets an account claim tokens.
    function claim(
        address _receiver,
        uint256 _quantity,
        address _currency,
        uint256 _pricePerToken,
        AllowlistProof calldata _allowlistProof,
        bytes memory _data
    ) public payable virtual override {
        _beforeClaim(_receiver, _quantity, _currency, _pricePerToken, _allowlistProof, _data);

        bytes32 activeConditionId = conditionId;

        verifyClaim(_dropMsgSender(), _quantity, _currency, _pricePerToken, _allowlistProof);

        // Update contract state.
        claimCondition.supplyClaimed += _quantity;
        supplyClaimedByWallet[activeConditionId][_dropMsgSender()] += _quantity;

        // If there's a price, collect price.
        _collectPriceOnClaim(address(0), _quantity, _currency, _pricePerToken);

        // Mint the relevant NFTs to claimer.
        uint256 startTokenId = _transferTokensOnClaim(_receiver, _quantity);

        emit TokensClaimed(_dropMsgSender(), _receiver, startTokenId, _quantity);

        _afterClaim(_receiver, _quantity, _currency, _pricePerToken, _allowlistProof, _data);
    }

    /// @dev Lets a contract admin set claim conditions.
    function setClaimConditions(ClaimCondition calldata _condition, bool _resetClaimEligibility) external override {
        if (!_canSetClaimConditions()) {
            revert("Not authorized");
        }

        bytes32 targetConditionId = conditionId;
        uint256 supplyClaimedAlready = claimCondition.supplyClaimed;

        if (_resetClaimEligibility) {
            supplyClaimedAlready = 0;
            targetConditionId = keccak256(abi.encodePacked(_dropMsgSender(), block.number));
        }

        if (supplyClaimedAlready > _condition.maxClaimableSupply) {
            revert("max supply claimed");
        }

        claimCondition = ClaimCondition({
            startTimestamp: _condition.startTimestamp,
            maxClaimableSupply: _condition.maxClaimableSupply,
            supplyClaimed: supplyClaimedAlready,
            quantityLimitPerWallet: _condition.quantityLimitPerWallet,
            merkleRoot: _condition.merkleRoot,
            pricePerToken: _condition.pricePerToken,
            currency: _condition.currency,
            metadata: _condition.metadata
        });
        conditionId = targetConditionId;

        emit ClaimConditionUpdated(_condition, _resetClaimEligibility);
    }

    /// @dev Checks a request to claim NFTs against the active claim condition's criteria.
    function verifyClaim(
        address _claimer,
        uint256 _quantity,
        address _currency,
        uint256 _pricePerToken,
        AllowlistProof calldata _allowlistProof
    ) public view returns (bool isOverride) {
        ClaimCondition memory currentClaimPhase = claimCondition;
        uint256 claimLimit = currentClaimPhase.quantityLimitPerWallet;
        uint256 claimPrice = currentClaimPhase.pricePerToken;
        address claimCurrency = currentClaimPhase.currency;

        if (currentClaimPhase.merkleRoot != bytes32(0)) {
            (isOverride, ) = MerkleProof.verify(
                _allowlistProof.proof,
                currentClaimPhase.merkleRoot,
                keccak256(
                    abi.encodePacked(
                        _claimer,
                        _allowlistProof.quantityLimitPerWallet,
                        _allowlistProof.pricePerToken,
                        _allowlistProof.currency
                    )
                )
            );
        }

        if (isOverride) {
            claimLimit = _allowlistProof.quantityLimitPerWallet != 0
                ? _allowlistProof.quantityLimitPerWallet
                : claimLimit;
            claimPrice = _allowlistProof.pricePerToken != type(uint256).max
                ? _allowlistProof.pricePerToken
                : claimPrice;
            claimCurrency = _allowlistProof.pricePerToken != type(uint256).max && _allowlistProof.currency != address(0)
                ? _allowlistProof.currency
                : claimCurrency;
        }

        uint256 _supplyClaimedByWallet = supplyClaimedByWallet[conditionId][_claimer];

        if (_currency != claimCurrency || _pricePerToken != claimPrice) {
            revert("!PriceOrCurrency");
        }

        if (_quantity == 0 || (_quantity + _supplyClaimedByWallet > claimLimit)) {
            revert("!Qty");
        }

        if (currentClaimPhase.supplyClaimed + _quantity > currentClaimPhase.maxClaimableSupply) {
            revert("!MaxSupply");
        }

        if (currentClaimPhase.startTimestamp > block.timestamp) {
            revert("cant claim yet");
        }
    }

    /// @dev Returns the supply claimed by claimer for active conditionId.
    function getSupplyClaimedByWallet(address _claimer) public view returns (uint256) {
        return supplyClaimedByWallet[conditionId][_claimer];
    }

    /*////////////////////////////////////////////////////////////////////
        Optional hooks that can be implemented in the derived contract
    ///////////////////////////////////////////////////////////////////*/

    /// @dev Exposes the ability to override the msg sender.
    function _dropMsgSender() internal virtual returns (address) {
        return msg.sender;
    }

    /// @dev Runs before every `claim` function call.
    function _beforeClaim(
        address _receiver,
        uint256 _quantity,
        address _currency,
        uint256 _pricePerToken,
        AllowlistProof calldata _allowlistProof,
        bytes memory _data
    ) internal virtual {}

    /// @dev Runs after every `claim` function call.
    function _afterClaim(
        address _receiver,
        uint256 _quantity,
        address _currency,
        uint256 _pricePerToken,
        AllowlistProof calldata _allowlistProof,
        bytes memory _data
    ) internal virtual {}

    /// @dev Collects and distributes the primary sale value of NFTs being claimed.
    function _collectPriceOnClaim(
        address _primarySaleRecipient,
        uint256 _quantityToClaim,
        address _currency,
        uint256 _pricePerToken
    ) internal virtual;

    /// @dev Transfers the NFTs being claimed.
    function _transferTokensOnClaim(address _to, uint256 _quantityBeingClaimed)
        internal
        virtual
        returns (uint256 startTokenId);

    function _canSetClaimConditions() internal view virtual returns (bool);
}

// File: @thirdweb-dev/contracts/extension/Multicall.sol



// SPDX-License-Identifier: Apache 2.0
pragma solidity ^0.8.0;

/// @author thirdweb

import "../lib/TWAddress.sol";
import "./interface/IMulticall.sol";

/**
 * @dev Provides a function to batch together multiple calls in a single external call.
 *
 * _Available since v4.1._
 */
contract Multicall is IMulticall {
    /**
     *  @notice Receives and executes a batch of function calls on this contract.
     *  @dev Receives and executes a batch of function calls on this contract.
     *
     *  @param data The bytes data that makes up the batch of function calls to execute.
     *  @return results The bytes data that makes up the result of the batch of function calls executed.
     */
    function multicall(bytes[] calldata data) external virtual override returns (bytes[] memory results) {
        results = new bytes[](data.length);
        for (uint256 i = 0; i < data.length; i++) {
            results[i] = TWAddress.functionDelegateCall(address(this), data[i]);
        }
        return results;
    }
}

// File: @thirdweb-dev/contracts/extension/Ownable.sol



// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

/// @author thirdweb

import "./interface/IOwnable.sol";

/**
 *  @title   Ownable
 *  @notice  Thirdweb's `Ownable` is a contract extension to be used with any base contract. It exposes functions for setting and reading
 *           who the 'owner' of the inheriting smart contract is, and lets the inheriting contract perform conditional logic that uses
 *           information about who the contract's owner is.
 */

abstract contract Ownable is IOwnable {
    /// @dev Owner of the contract (purpose: OpenSea compatibility)
    address private _owner;

    /// @dev Reverts if caller is not the owner.
    modifier onlyOwner() {
        if (msg.sender != _owner) {
            revert("Not authorized");
        }
        _;
    }

    /**
     *  @notice Returns the owner of the contract.
     */
    function owner() public view override returns (address) {
        return _owner;
    }

    /**
     *  @notice Lets an authorized wallet set a new owner for the contract.
     *  @param _newOwner The address to set as the new owner of the contract.
     */
    function setOwner(address _newOwner) external override {
        if (!_canSetOwner()) {
            revert("Not authorized");
        }
        _setupOwner(_newOwner);
    }

    /// @dev Lets a contract admin set a new owner for the contract. The new owner must be a contract admin.
    function _setupOwner(address _newOwner) internal {
        address _prevOwner = _owner;
        _owner = _newOwner;

        emit OwnerUpdated(_prevOwner, _newOwner);
    }

    /// @dev Returns whether owner can be set in the given execution context.
    function _canSetOwner() internal view virtual returns (bool);
}

// File: @thirdweb-dev/contracts/extension/PrimarySale.sol



// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

/// @author thirdweb

import "./interface/IPrimarySale.sol";

/**
 *  @title   Primary Sale
 *  @notice  Thirdweb's `PrimarySale` is a contract extension to be used with any base contract. It exposes functions for setting and reading
 *           the recipient of primary sales, and lets the inheriting contract perform conditional logic that uses information about
 *           primary sales, if desired.
 */

abstract contract PrimarySale is IPrimarySale {
    /// @dev The address that receives all primary sales value.
    address private recipient;

    /// @dev Returns primary sale recipient address.
    function primarySaleRecipient() public view override returns (address) {
        return recipient;
    }

    /**
     *  @notice         Updates primary sale recipient.
     *  @dev            Caller should be authorized to set primary sales info.
     *                  See {_canSetPrimarySaleRecipient}.
     *                  Emits {PrimarySaleRecipientUpdated Event}; See {_setupPrimarySaleRecipient}.
     *
     *  @param _saleRecipient   Address to be set as new recipient of primary sales.
     */
    function setPrimarySaleRecipient(address _saleRecipient) external override {
        if (!_canSetPrimarySaleRecipient()) {
            revert("Not authorized");
        }
        _setupPrimarySaleRecipient(_saleRecipient);
    }

    /// @dev Lets a contract admin set the recipient for all primary sales.
    function _setupPrimarySaleRecipient(address _saleRecipient) internal {
        recipient = _saleRecipient;
        emit PrimarySaleRecipientUpdated(_saleRecipient);
    }

    /// @dev Returns whether primary sale recipient can be set in the given execution context.
    function _canSetPrimarySaleRecipient() internal view virtual returns (bool);
}

// File: @thirdweb-dev/contracts/extension/interface/IBurnableERC20.sol



// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

/// @author thirdweb

interface IBurnableERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) external;

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) external;
}

// File: @thirdweb-dev/contracts/extension/interface/IClaimCondition.sol



// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

/// @author thirdweb

/**
 *  The interface `IClaimCondition` is written for thirdweb's 'Drop' contracts, which are distribution mechanisms for tokens.
 *
 *  A claim condition defines criteria under which accounts can mint tokens. Claim conditions can be overwritten
 *  or added to by the contract admin. At any moment, there is only one active claim condition.
 */

interface IClaimCondition {
    /**
     *  @notice The criteria that make up a claim condition.
     *
     *  @param startTimestamp                 The unix timestamp after which the claim condition applies.
     *                                        The same claim condition applies until the `startTimestamp`
     *                                        of the next claim condition.
     *
     *  @param maxClaimableSupply             The maximum total number of tokens that can be claimed under
     *                                        the claim condition.
     *
     *  @param supplyClaimed                  At any given point, the number of tokens that have been claimed
     *                                        under the claim condition.
     *
     *  @param quantityLimitPerWallet         The maximum number of tokens that can be claimed by a wallet.
     *
     *  @param merkleRoot                     The allowlist of addresses that can claim tokens under the claim
     *                                        condition.
     *
     *  @param pricePerToken                  The price required to pay per token claimed.
     *
     *  @param currency                       The currency in which the `pricePerToken` must be paid.
     *
     *  @param metadata                       Claim condition metadata.
     */
    struct ClaimCondition {
        uint256 startTimestamp;
        uint256 maxClaimableSupply;
        uint256 supplyClaimed;
        uint256 quantityLimitPerWallet;
        bytes32 merkleRoot;
        uint256 pricePerToken;
        address currency;
        string metadata;
    }
}

// File: @thirdweb-dev/contracts/extension/interface/IContractMetadata.sol



// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

/// @author thirdweb

/**
 *  Thirdweb's `ContractMetadata` is a contract extension for any base contracts. It lets you set a metadata URI
 *  for you contract.
 *
 *  Additionally, `ContractMetadata` is necessary for NFT contracts that want royalties to get distributed on OpenSea.
 */

interface IContractMetadata {
    /// @dev Returns the metadata URI of the contract.
    function contractURI() external view returns (string memory);

    /**
     *  @dev Sets contract URI for the storefront-level metadata of the contract.
     *       Only module admin can call this function.
     */
    function setContractURI(string calldata _uri) external;

    /// @dev Emitted when the contract URI is updated.
    event ContractURIUpdated(string prevURI, string newURI);
}

// File: @thirdweb-dev/contracts/extension/interface/IDropSinglePhase.sol



// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

/// @author thirdweb

import "./IClaimCondition.sol";

/**
 *  The interface `IDropSinglePhase` is written for thirdweb's 'DropSinglePhase' contracts, which are distribution mechanisms for tokens.
 *
 *  An authorized wallet can set a claim condition for the distribution of the contract's tokens.
 *  A claim condition defines criteria under which accounts can mint tokens. Claim conditions can be overwritten
 *  or added to by the contract admin. At any moment, there is only one active claim condition.
 */

interface IDropSinglePhase is IClaimCondition {
    /**
     *  @param proof Prood of concerned wallet's inclusion in an allowlist.
     *  @param quantityLimitPerWallet The total quantity of tokens the allowlisted wallet is eligible to claim over time.
     *  @param pricePerToken The price per token the allowlisted wallet must pay to claim tokens.
     *  @param currency The currency in which the allowlisted wallet must pay the price for claiming tokens.
     */
    struct AllowlistProof {
        bytes32[] proof;
        uint256 quantityLimitPerWallet;
        uint256 pricePerToken;
        address currency;
    }

    /// @notice Emitted when tokens are claimed via `claim`.
    event TokensClaimed(
        address indexed claimer,
        address indexed receiver,
        uint256 indexed startTokenId,
        uint256 quantityClaimed
    );

    /// @notice Emitted when the contract's claim conditions are updated.
    event ClaimConditionUpdated(ClaimCondition condition, bool resetEligibility);

    /**
     *  @notice Lets an account claim a given quantity of NFTs.
     *
     *  @param receiver                       The receiver of the NFTs to claim.
     *  @param quantity                       The quantity of NFTs to claim.
     *  @param currency                       The currency in which to pay for the claim.
     *  @param pricePerToken                  The price per token to pay for the claim.
     *  @param allowlistProof                 The proof of the claimer's inclusion in the merkle root allowlist
     *                                        of the claim conditions that apply.
     *  @param data                           Arbitrary bytes data that can be leveraged in the implementation of this interface.
     */
    function claim(
        address receiver,
        uint256 quantity,
        address currency,
        uint256 pricePerToken,
        AllowlistProof calldata allowlistProof,
        bytes memory data
    ) external payable;

    /**
     *  @notice Lets a contract admin (account with `DEFAULT_ADMIN_ROLE`) set claim conditions.
     *
     *  @param phase                    Claim condition to set.
     *
     *  @param resetClaimEligibility    Whether to honor the restrictions applied to wallets who have claimed tokens in the current conditions,
     *                                  in the new claim conditions being set.
     */
    function setClaimConditions(ClaimCondition calldata phase, bool resetClaimEligibility) external;
}

// File: @thirdweb-dev/contracts/extension/interface/IMulticall.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/// @author thirdweb

/**
 * @dev Provides a function to batch together multiple calls in a single external call.
 *
 * _Available since v4.1._
 */
interface IMulticall {
    /**
     * @dev Receives and executes a batch of function calls on this contract.
     */
    function multicall(bytes[] calldata data) external returns (bytes[] memory results);
}

// File: @thirdweb-dev/contracts/extension/interface/IOwnable.sol



// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

/// @author thirdweb

/**
 *  Thirdweb's `Ownable` is a contract extension to be used with any base contract. It exposes functions for setting and reading
 *  who the 'owner' of the inheriting smart contract is, and lets the inheriting contract perform conditional logic that uses
 *  information about who the contract's owner is.
 */

interface IOwnable {
    /// @dev Returns the owner of the contract.
    function owner() external view returns (address);

    /// @dev Lets a module admin set a new owner for the contract. The new owner must be a module admin.
    function setOwner(address _newOwner) external;

    /// @dev Emitted when a new Owner is set.
    event OwnerUpdated(address indexed prevOwner, address indexed newOwner);
}

// File: @thirdweb-dev/contracts/extension/interface/IPrimarySale.sol



// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

/// @author thirdweb

/**
 *  Thirdweb's `Primary` is a contract extension to be used with any base contract. It exposes functions for setting and reading
 *  the recipient of primary sales, and lets the inheriting contract perform conditional logic that uses information about
 *  primary sales, if desired.
 */

interface IPrimarySale {
    /// @dev The adress that receives all primary sales value.
    function primarySaleRecipient() external view returns (address);

    /// @dev Lets a module admin set the default recipient of all primary sales.
    function setPrimarySaleRecipient(address _saleRecipient) external;

    /// @dev Emitted when a new sale recipient is set.
    event PrimarySaleRecipientUpdated(address indexed recipient);
}

// File: @thirdweb-dev/contracts/interfaces/IWETH.sol



// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

interface IWETH {
    function deposit() external payable;

    function withdraw(uint256 amount) external;

    function transfer(address to, uint256 value) external returns (bool);
}

// File: @thirdweb-dev/contracts/lib/CurrencyTransferLib.sol



// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

/// @author thirdweb

// Helper interfaces
import { IWETH } from "../interfaces/IWETH.sol";

import "../openzeppelin-presets/token/ERC20/utils/SafeERC20.sol";

library CurrencyTransferLib {
    using SafeERC20 for IERC20;

    /// @dev The address interpreted as native token of the chain.
    address public constant NATIVE_TOKEN = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

    /// @dev Transfers a given amount of currency.
    function transferCurrency(
        address _currency,
        address _from,
        address _to,
        uint256 _amount
    ) internal {
        if (_amount == 0) {
            return;
        }

        if (_currency == NATIVE_TOKEN) {
            safeTransferNativeToken(_to, _amount);
        } else {
            safeTransferERC20(_currency, _from, _to, _amount);
        }
    }

    /// @dev Transfers a given amount of currency. (With native token wrapping)
    function transferCurrencyWithWrapper(
        address _currency,
        address _from,
        address _to,
        uint256 _amount,
        address _nativeTokenWrapper
    ) internal {
        if (_amount == 0) {
            return;
        }

        if (_currency == NATIVE_TOKEN) {
            if (_from == address(this)) {
                // withdraw from weth then transfer withdrawn native token to recipient
                IWETH(_nativeTokenWrapper).withdraw(_amount);
                safeTransferNativeTokenWithWrapper(_to, _amount, _nativeTokenWrapper);
            } else if (_to == address(this)) {
                // store native currency in weth
                require(_amount == msg.value, "msg.value != amount");
                IWETH(_nativeTokenWrapper).deposit{ value: _amount }();
            } else {
                safeTransferNativeTokenWithWrapper(_to, _amount, _nativeTokenWrapper);
            }
        } else {
            safeTransferERC20(_currency, _from, _to, _amount);
        }
    }

    /// @dev Transfer `amount` of ERC20 token from `from` to `to`.
    function safeTransferERC20(
        address _currency,
        address _from,
        address _to,
        uint256 _amount
    ) internal {
        if (_from == _to) {
            return;
        }

        if (_from == address(this)) {
            IERC20(_currency).safeTransfer(_to, _amount);
        } else {
            IERC20(_currency).safeTransferFrom(_from, _to, _amount);
        }
    }

    /// @dev Transfers `amount` of native token to `to`.
    function safeTransferNativeToken(address to, uint256 value) internal {
        // solhint-disable avoid-low-level-calls
        // slither-disable-next-line low-level-calls
        (bool success, ) = to.call{ value: value }("");
        require(success, "native token transfer failed");
    }

    /// @dev Transfers `amount` of native token to `to`. (With native token wrapping)
    function safeTransferNativeTokenWithWrapper(
        address to,
        uint256 value,
        address _nativeTokenWrapper
    ) internal {
        // solhint-disable avoid-low-level-calls
        // slither-disable-next-line low-level-calls
        (bool success, ) = to.call{ value: value }("");
        if (!success) {
            IWETH(_nativeTokenWrapper).deposit{ value: value }();
            IERC20(_nativeTokenWrapper).safeTransfer(to, value);
        }
    }
}

// File: @thirdweb-dev/contracts/lib/MerkleProof.sol



// SPDX-License-Identifier: Apache 2.0
pragma solidity ^0.8.0;

/// @author thirdweb

/**
 * @dev These functions deal with verification of Merkle Trees proofs.
 *
 * The proofs can be generated using the JavaScript library
 * https://github.com/miguelmota/merkletreejs[merkletreejs].
 * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
 *
 * See `test/utils/cryptography/MerkleProof.test.js` for some examples.
 *
 * Source: https://github.com/ensdomains/governance/blob/master/contracts/MerkleProof.sol
 */
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, uint256) {
        bytes32 computedHash = leaf;
        uint256 index = 0;

        for (uint256 i = 0; i < proof.length; i++) {
            index *= 2;
            bytes32 proofElement = proof[i];

            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
                index += 1;
            }
        }

        // Check if the computed hash (root) is equal to the provided root
        return (computedHash == root, index);
    }
}

// File: @thirdweb-dev/contracts/lib/TWAddress.sol



// SPDX-License-Identifier: Apache 2.0
pragma solidity ^0.8.0;

/// @author thirdweb

/**
 * @dev Collection of functions related to the address type
 */
library TWAddress {
    /**
     * @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
     * ====
     *
     * [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.
     *
     * [EIP1884](https://eips.ethereum.org/EIPS/eip-1884) 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://diligence.consensys.net/posts/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/v0.5.11/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 functionCall(target, data, "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");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @thirdweb-dev/contracts/lib/TWStrings.sol



// SPDX-License-Identifier: Apache 2.0
pragma solidity ^0.8.0;

/// @author thirdweb

/**
 * @dev String operations.
 */
library TWStrings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// File: @thirdweb-dev/contracts/openzeppelin-presets/token/ERC20/ERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "../../../eip/interface/IERC20.sol";
import "../../../eip/interface/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, _allowances[owner][spender] + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = _allowances[owner][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Spend `amount` form the allowance of `owner` toward `spender`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

// File: @thirdweb-dev/contracts/openzeppelin-presets/token/ERC20/extensions/ERC20Permit.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-ERC20Permit.sol)

pragma solidity ^0.8.0;

import "../../../../eip/interface/IERC20Permit.sol";
import "../ERC20.sol";
import "../../../utils/cryptography/EIP712.sol";
import "../../../utils/cryptography/ECDSA.sol";
import "../../../utils/Counters.sol";

/**
 * @dev Implementation 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.
 *
 * _Available since v3.4._
 */
abstract contract ERC20Permit is ERC20, IERC20Permit {
    using Counters for Counters.Counter;

    mapping(address => Counters.Counter) private _nonces;

    // solhint-disable-next-line var-name-mixedcase
    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;

    // solhint-disable-next-line var-name-mixedcase
    uint256 private immutable _CACHED_CHAIN_ID;

    // solhint-disable-next-line var-name-mixedcase
    address private immutable _CACHED_THIS;

    // solhint-disable-next-line var-name-mixedcase
    bytes32 private immutable _PERMIT_TYPEHASH =
        keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");

    /**
     * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`.
     *
     * It's a good idea to use the same `name` that is defined as the ERC20 token name.
     */
    constructor(string memory name_, string memory symbol_) ERC20(name_, symbol_) {
        _CACHED_CHAIN_ID = block.chainid;
        _CACHED_THIS = address(this);
        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator();
    }

    /**
     * @dev See {IERC20Permit-permit}.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        require(block.timestamp <= deadline, "ERC20Permit: expired deadline");

        bytes32 structHash = keccak256(abi.encode(_PERMIT_TYPEHASH, owner, spender, value, _useNonce(owner), deadline));

        bytes32 hash = ECDSA.toTypedDataHash(DOMAIN_SEPARATOR(), structHash);

        address signer = ECDSA.recover(hash, v, r, s);
        require(signer == owner, "ERC20Permit: invalid signature");

        _approve(owner, spender, value);
    }

    /**
     * @dev See {IERC20Permit-nonces}.
     */
    function nonces(address owner) public view virtual override returns (uint256) {
        return _nonces[owner].current();
    }

    /**
     * @dev See {IERC20Permit-DOMAIN_SEPARATOR}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() public view override returns (bytes32) {
        if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator();
        }
    }

    function _buildDomainSeparator() private view returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name())),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

    /**
     * @dev "Consume a nonce": return the current value and increment.
     *
     * _Available since v4.1._
     */
    function _useNonce(address owner) internal virtual returns (uint256 current) {
        Counters.Counter storage nonce = _nonces[owner];
        current = nonce.current();
        nonce.increment();
    }
}

// File: @thirdweb-dev/contracts/openzeppelin-presets/token/ERC20/utils/SafeERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../../../../eip/interface/IERC20.sol";
import "../../../../lib/TWAddress.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 TWAddress for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    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));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    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");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @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");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: @thirdweb-dev/contracts/openzeppelin-presets/utils/Context.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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;
    }
}

// File: @thirdweb-dev/contracts/openzeppelin-presets/utils/Counters.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

// File: @thirdweb-dev/contracts/openzeppelin-presets/utils/cryptography/ECDSA.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../../../lib/TWStrings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV // Deprecated in v4.8
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 27);
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32 message) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, "\x19Ethereum Signed Message:\n32")
            mstore(0x1c, hash)
            message := keccak256(0x00, 0x3c)
        }
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", TWStrings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32 data) {
        /// @solidity memory-safe-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, "\x19\x01")
            mstore(add(ptr, 0x02), domainSeparator)
            mstore(add(ptr, 0x22), structHash)
            data := keccak256(ptr, 0x42)
        }
    }

    /**
     * @dev Returns an Ethereum Signed Data with intended validator, created from a
     * `validator` and `data` according to the version 0 of EIP-191.
     *
     * See {recover}.
     */
    function toDataWithIntendedValidatorHash(address validator, bytes memory data) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x00", validator, data));
    }
}

// File: @thirdweb-dev/contracts/openzeppelin-presets/utils/cryptography/EIP712.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/draft-EIP712.sol)

pragma solidity ^0.8.0;

import "./ECDSA.sol";

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712 {
    /* solhint-disable var-name-mixedcase */
    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
    // invalidate the cached domain separator if the chain id changes.
    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
    uint256 private immutable _CACHED_CHAIN_ID;
    address private immutable _CACHED_THIS;

    bytes32 private immutable _HASHED_NAME;
    bytes32 private immutable _HASHED_VERSION;
    bytes32 private immutable _TYPE_HASH;

    /* solhint-enable var-name-mixedcase */

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        bytes32 typeHash = keccak256(
            "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
        );
        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
        _CACHED_CHAIN_ID = block.chainid;
        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
        _CACHED_THIS = address(this);
        _TYPE_HASH = typeHash;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
        }
    }

    function _buildDomainSeparator(
        bytes32 typeHash,
        bytes32 nameHash,
        bytes32 versionHash
    ) private view returns (bytes32) {
        return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this)));
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
    }
}

// File: contracts/Contract.sol



//     _____  ________  _______   __    __ 
//    |     \|        \|       \ |  \  /  \
//     \$$$$$| $$$$$$$$| $$$$$$$\| $$ /  $$
//       | $$| $$__    | $$__| $$| $$/  $$ 
//  __   | $$| $$  \   | $$    $$| $$  $$  
// |  \  | $$| $$$$$   | $$$$$$$\| $$$$$\  
// | $$__| $$| $$_____ | $$  | $$| $$ \$$\ 
//  \$$    $$| $$     \| $$  | $$| $$  \$$\
//   \$$$$$$  \$$$$$$$$ \$$   \$$ \$$   \$$
//
// JERK Token
// The world's first Fap-to-Earn (F2E) token & NFT! 🍆💦💰 
// Earn $JERK tokens with Proof of Jerk™.
// https://twitter.com/JERK_ETH

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@thirdweb-dev/contracts/base/ERC20Drop.sol";

/// @title JERK Token ERC20 contract
/// @author kzoink
/// @notice Fungible token for the JERK ecosystem
/// @dev Inherits ERC20Drop contract from thirdweb
contract Contract is ERC20Drop { //, Pausable {

    /// @notice Pause flag
    bool private isPaused;

    /// @notice Blacklist of wallets that to prevent from transacting this token (used to blacklist bad actors)
    mapping(address => bool) private blacklisted;

    /// @notice Maximum transfer amount per transaction in basis points (used for antiwhale protection)
    /// @dev E.g., 50 - 0.5% of total supply. Set to 0 to turn off.
    uint256 private maxTransferAmountRate;

    constructor(
        address _defaultAdmin,
        string memory _name,
        string memory _symbol,
        address _primarySaleRecipient
    )
        ERC20Drop(
            _defaultAdmin,
            _name,
            _symbol,
            _primarySaleRecipient
        )
    {
        isPaused = false;

        maxTransferAmountRate = 0; // Max transfer amount rate set to 0 by default to turn off
    }

    /// @notice Returns true if the contract is paused, and false otherwise
    function paused() public view virtual returns (bool) {
        //return isPaused;
        return isPaused;
    }

    /// @notice Pauses transfers
    function pause() public onlyOwner {
        _pause();
    }

    /// @notice Pauses transfers
    function _pause() internal virtual whenNotPaused {
        isPaused = true;
        emit Paused(_msgSender());
    }

    /// @notice Unpauses transfers
    function unpause() public onlyOwner {
        _unpause();
    }

    /// @notice Unpauses transfers
    function _unpause() internal virtual whenPaused {
        isPaused = false;
        emit Unpaused(_msgSender());
    }

    /// @notice Function to set the maximum transfer amount rate per transaction
    /// @param _maxTransferAmountRate Max amount of supply that can be transferred in basis points (E.g., 50 - 0.5% of total supply)
    function setMaxTransferAmountRate(uint256 _maxTransferAmountRate) external onlyOwner {
        maxTransferAmountRate = _maxTransferAmountRate;
        emit MaxTransferAmountRateSet(_maxTransferAmountRate);
    }

    /// @notice Returns the max buy amount
    /// @return Max transfer amount (in tokens)
    function maxTransferAmount() public view returns (uint256) {
        return totalSupply() * maxTransferAmountRate / 10000;
    }

    /// @notice Add a wallet to the blacklist
    /// @param _address The address to be added to the blacklist
    function addToBlacklist(address _address) external onlyOwner {
        blacklisted[_address] = true;
        emit AddedToBlacklist(_address);
    }

    /// @notice Remove a wallet from the blacklist
    /// @param _address The address to be removed from the blacklist
    function removeFromBlacklist(address _address) external onlyOwner {
        blacklisted[_address] = false;
        emit RemovedFromBlacklist(_address);
    }

    /// @notice Pause functionality
    /// @param from The sender of the transfer
    /// @param to The recipient of the transfer
    /// @param amount The amount of the transfer (prior to any applicable tax)
    function _beforeTokenTransfer(address from, address to, uint256 amount)
        internal
        whenNotPaused
        override
    {
        super._beforeTokenTransfer(from, to, amount);
    }

    /// @notice Override the transfer function to apply tax based on the whitelist
    /// @param sender The sender of the transfer
    /// @param recipient The recipient of the transfer
    /// @param amount The amount of the transfer (prior to any applicable tax)
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal override antiWhale(sender, recipient, amount) notBlacklisted(msg.sender) notBlacklisted(recipient) {
        super._transfer(sender, recipient, amount);
    }

    /// @notice Override the transferFrom function to apply anti-whale, tax, and blacklist functions
    /// @param sender The sender of the transfer
    /// @param recipient The recipient of the transfer
    /// @param amount The amount of the transfer (prior to any applicable tax)
    /// @return True if the transfer succeeded
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public override antiWhale(sender, recipient, amount) notBlacklisted(msg.sender) notBlacklisted(recipient) returns (bool) {
        return super.transferFrom(sender, recipient, amount);
    }

    /// @notice Throws if the contract is paused
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /// @notice Throws if the contract is not paused
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /// @notice Modifier to make a function callable only when the contract is paused
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /// @notice Modifier to make a function callable only when the contract is paused
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /// @notice Modifier to insert antiwhale protections
    /// @param sender The sender of the transfer
    /// @param recipient The recipient of the transfer
    /// @param amount The amount of the transfer
    modifier antiWhale(address sender, address recipient, uint256 amount) 
    {
        if (maxTransferAmount() > 0) 
        {
            require(amount <= maxTransferAmount(), "Transfer amount exceeds the maxTransferAmount");
        }
        _;
    }

    /// @notice Modifier to insert blacklist check
    /// @param _address The address to check for blacklisting
    modifier notBlacklisted(address _address) {
        require(!blacklisted[_address], "Account is blacklisted");
        _;
    }

    /// @dev Emitted when the pause is triggered
    /// @param account The account that triggered the pause
    event Paused(address account);
    /// @dev Emitted when the pause is lifted
    /// @param account The account that lifted the pause
    event Unpaused(address account);
    /// @dev Emitted when a max transfer amount rate is set
    /// @param rate The max transfer rate (percentage of the total supply) in basis points
    event MaxTransferAmountRateSet(uint256 rate);
    /// @dev Emitted when an account is blacklisted
    /// @param account The account added to the blacklist
    event AddedToBlacklist(address indexed account);
    /// @dev Emitted when an account is removed from the blacklist
    /// @param account The account removed from the blacklist
    event RemovedFromBlacklist(address indexed account);
}