// File: contracts/NFTMinter.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.14;

import "@openzeppelin/contracts/access/Ownable.sol";
import "./SignedAllowance.sol";

interface INFT { 
    function mint(address to, uint256 qty) external;
    function sweepNFT(address sweeper, uint256 tokenId) external; 
    function unclaimedSupply() external view returns (uint256);
    function totalMinted() external view returns (uint256);
    function MAX_ITEMS() external view returns (uint256);
}

interface IWBMC { 
    function ownerOf(uint256 tokenId) external view returns (address); 
}

contract NFTMinter is Ownable, SignedAllowance{  

    /*///////////////////////////////////////////////////////////////
                            GENERAL STORAGE
    //////////////////////////////////////////////////////////////*/

    INFT private nftContract;
    IWBMC private wbmcContract;

    bool public presaleActive;
    
    bool public publicSaleActive;
    uint256 public publicSalePrice;  // 0 ETH
    uint256 public maxPerPublicMint = 1;

    mapping (uint256 => bool) public claimed;

    /*///////////////////////////////////////////////////////////////
                              CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(address _nftContract, address _wbmcContract) {
        setNFTContract(_nftContract);   
        wbmcContract = IWBMC(_wbmcContract);
    }

    /*///////////////////////////////////////////////////////////////
                        MINTING LOGIC
    //////////////////////////////////////////////////////////////*/

    function presaleOrder(address to, uint256 nonce, bytes memory signature) public {
        require (presaleActive, "Presale not active");

        //qty is stored in the middle 64 bytes
        uint256 qty = uint256(uint64(nonce >> 128));

        // this will throw if the allowance has already been used or is not valid
        _useAllowance(to, nonce, signature);

        nftContract.mint(to, qty); 
    }

    function publicOrder(address to, uint256 qty) public payable {
        
        require(tx.origin == msg.sender, "Only EOAs allowed");
        require (publicSaleActive, "Public sale not active");
        require (qty <= maxPerPublicMint, ">Max per mint");
        require (msg.value >= publicSalePrice * qty, "Minter: Not Enough Eth");

        nftContract.mint(to, qty); 
    }

    function wbmcFreeMint(uint256[] calldata tokenIds) public {
        require (presaleActive, "Presale not active");
        
        uint256 qty = 0;
        
        for (uint256 i=0; i<tokenIds.length; i++) {
            uint256 curTokenId = tokenIds[i];
            if (wbmcContract.ownerOf(curTokenId) == msg.sender && !claimed[curTokenId]) {
                claimed[curTokenId] = true;
                qty++;
            }
        }
        nftContract.mint(msg.sender, qty); 
    }

    function adminMint(address to, uint256 qty) public onlyOwner {
        nftContract.mint(to, qty);
    }

    function donate() public payable {
        //  Thank you!
    }

    /*///////////////////////////////////////////////////////////////
                        VIEWS
    //////////////////////////////////////////////////////////////*/

    function unclaimedSupply() public view returns (uint256) {
        return nftContract.unclaimedSupply();
    }

    /*///////////////////////////////////////////////////////////////
                       ADMIN FUNCTIONS
    //////////////////////////////////////////////////////////////*/

    function setNFTContract(address _newNFT) public onlyOwner {
        nftContract = INFT(_newNFT);
    }

    function switchPresale() public onlyOwner {
        presaleActive = !presaleActive;
    }

    function switchPublicSale() public onlyOwner {
        publicSaleActive = !publicSaleActive;
    }

    function setPublicSalePrice(uint256 _newPublicSalePrice) public onlyOwner {
        publicSalePrice = _newPublicSalePrice;
    }

    /// @notice sets allowance signer, this can be used to revoke all unused allowances already out there
    /// @param newSigner the new signer
    function setAllowancesSigner(address newSigner) external onlyOwner {
        _setAllowancesSigner(newSigner);
    }

    function setMaxPerPublicMint(uint256 _newMaxPerMint) public onlyOwner {
        maxPerPublicMint = _newMaxPerMint;
    }

    /*///////////////////////////////////////////////////////////////
                       WITHDRAWALS
    //////////////////////////////////////////////////////////////*/

    /// @notice Withdraws funds from the contract to msg.sender who is always the owner.
    /// @param amt amount to withdraw in wei
    function withdraw(uint256 amt) public onlyOwner {
        payable(msg.sender).transfer(amt);
    }

    /*///////////////////////////////////////////////////////////////
                       ERC721Receiver interface compatibility
    //////////////////////////////////////////////////////////////*/

    function onERC721Received(
    address, 
    address, 
    uint256, 
    bytes calldata
    ) external pure returns(bytes4) {
        return bytes4(keccak256("I do not receive ERC721"));
    } 
}

//   That's all, folks!



// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

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

// File: contracts/SignedAllowance.sol



//SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

import '@openzeppelin/contracts/utils/cryptography/ECDSA.sol';

/// @title SignedAllowance
/// @author Simon Fremaux (@dievardump)
contract SignedAllowance {
    using ECDSA for bytes32;

    // list of already used allowances
    mapping(bytes32 => bool) public usedAllowances;

    // address used to sign the allowances
    address private _allowancesSigner;

    /// @notice Helper to know allowancesSigner address
    /// @return the allowance signer address
    function allowancesSigner() public view virtual returns (address) {
        return _allowancesSigner;
    }

    /// @notice Helper that creates the message that signer needs to sign to allow a mint
    ///         this is usually also used when creating the allowances, to ensure "message"
    ///         is the same
    /// @param account the account to allow
    /// @param nonce the nonce
    /// @return the message to sign
    function createMessage(address account, uint256 nonce)
        public
        view
        returns (bytes32)
    {
        return keccak256(abi.encode(account, nonce, address(this)));
    }

    /// @notice Helper that creates a list of messages that signer needs to sign to allow mintings
    /// @param accounts the accounts to allow
    /// @param nonces the corresponding nonces
    /// @return messages the messages to sign
  /*  
    // function is commented out to save space in the contract
    // to batch create message will need to use for loop with the createMessage function

    function createMessages(address[] memory accounts, uint256[] memory nonces)
        external
        view
        returns (bytes32[] memory messages)
    {
        require(accounts.length == nonces.length, '!LENGTH_MISMATCH!');
        messages = new bytes32[](accounts.length);
        for (uint256 i; i < accounts.length; i++) {
            messages[i] = createMessage(accounts[i], nonces[i]);
        }
    } */

    /// @notice This function verifies that the current request is valid
    /// @dev It ensures that _allowancesSigner signed a message containing (account, nonce, address(this))
    ///      and that this message was not already used
    /// @param account the account the allowance is associated to
    /// @param nonce the nonce associated to this allowance
    /// @param signature the signature by the allowance signer wallet
    /// @return the message to mark as used
    function validateSignature(
        address account,
        uint256 nonce,
        bytes memory signature
    ) public view returns (bytes32) {
        return
            _validateSignature(account, nonce, signature, allowancesSigner());
    }

    /// @dev It ensures that signer signed a message containing (account, nonce, address(this))
    ///      and that this message was not already used
    /// @param account the account the allowance is associated to
    /// @param nonce the nonce associated to this allowance
    /// @param signature the signature by the allowance signer wallet
    /// @param signer the signer
    /// @return the message to mark as used
    function _validateSignature(
        address account,
        uint256 nonce,
        bytes memory signature,
        address signer
    ) internal view returns (bytes32) {
        bytes32 message = createMessage(account, nonce)
            .toEthSignedMessageHash();

        // verifies that the sha3(account, nonce, address(this)) has been signed by signer
        require(message.recover(signature) == signer, '!INVALID_SIGNATURE!');

        // verifies that the allowances was not already used
        require(usedAllowances[message] == false, '!ALREADY_USED!');

        return message;
    }

    /// @notice internal function that verifies an allowance and marks it as used
    ///         this function throws if signature is wrong or this nonce for this user has already been used
    /// @param account the account the allowance is associated to
    /// @param nonce the nonce
    /// @param signature the signature by the allowance wallet
    function _useAllowance(
        address account,
        uint256 nonce,
        bytes memory signature
    ) internal {
        bytes32 message = validateSignature(account, nonce, signature);
        usedAllowances[message] = true;
    }

    /// @notice Allows to change the allowance signer. This can be used to revoke any signed allowance not already used
    /// @param newSigner the new signer address
    function _setAllowancesSigner(address newSigner) internal {
        _allowancesSigner = newSigner;
    }
}
// File: @openzeppelin/contracts/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: @openzeppelin/contracts/utils/cryptography/ECDSA.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.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
    }

    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");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' 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) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        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 if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // 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))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } 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 (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // 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) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @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", Strings.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) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

// File: @openzeppelin/contracts/utils/Strings.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @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);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}