// Contract: BlueChipSafe
// Target function: function verifyOwnershipOfTokens(address contractAddress, address primaryAddress) external view returns (uint256)
);

		// Clear approvals
		_approve(address(0), tokenId);

		_balances[owner] -= 1;
		delete _owners[tokenId];

		emit Transfer(owner, address(0), tokenId);
	}

	/**
	 * @dev Transfers `tokenId` from `from` to `to`.
	 *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
	 *
	 * Requirements:
	 *
	 * - `to` cannot be the zero address.
	 * - `tokenId` token must be owned by `from`.
	 *
	 * Emits a {Transfer} event.
	 */
	function _transfer(
		address from,
		address to,
		uint256 tokenId
	) internal virtual {
		require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
		require(to != address(0), "ERC721: transfer to the zero address");

		_beforeTokenTransfer(from, to, tokenId);

		// Clear approvals from the previous owner
		_approve(address(0), tokenId);

		_balances[from] -= 1;
		_balances[to] += 1;
		_owners[tokenId] = to;

		emit Transfer(from, to, tokenId);
	}

	/**
	 * @dev Approve `to` to operate on `tokenId`
	 *
	 * Emits a {Approval} event.
	 */
	function _approve(address to, uint256 tokenId) internal virtual {
		_tokenApprovals[tokenId] = to;
		emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
	}

	/**
	 * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
	 * The call is not executed if the target address is not a contract.
	 *
	 * @param from address representing the previous owner of the given token ID
	 * @param to target address that will receive the tokens
	 * @param tokenId uint256 ID of the token to be transferred
	 * @param _data bytes optional data to send along with the call
	 * @return bool whether the call correctly returned the expected magic value
	 */
	function _checkOnERC721Received(
		address from,
		address to,
		uint256 tokenId,
		bytes memory _data
	) private returns (bool) {
		if (to.isContract()) {
			try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
				return retval == IERC721Receiver.onERC721Received.selector;
			} catch (bytes memory reason) {
				if (reason.length == 0) {
					revert("ERC721: transfer to non ERC721Receiver implementer");
				} else {
					assembly {
						revert(add(32, reason), mload(reason))
					}
				}
			}
		} else {
			return true;
		}
	}

	/**
	 * @dev Hook that is called before any token transfer. This includes minting
	 * and burning.
	 *
	 * Calling conditions:
	 *
	 * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
	 * transferred to `to`.
	 * - When `from` is zero, `tokenId` will be minted for `to`.
	 * - When `to` is zero, ``from``'s `tokenId` 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 tokenId
	) internal virtual {}
}

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
	// Mapping from owner to list of owned token IDs
	mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

	// Mapping from token ID to index of the owner tokens list
	mapping(uint256 => uint256) private _ownedTokensIndex;

	// Array with all token ids, used for enumeration
	uint256[] private _allTokens;

	// Mapping from token id to position in the allTokens array
	mapping(uint256 => uint256) private _allTokensIndex;

	/**
	 * @dev See {IERC165-supportsInterface}.
	 */
	function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
		return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
	}

	/**
	 * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
	 */
	function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
		require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
		return _ownedTokens[owner][index];
	}

	/**
	 * @dev See {IERC721Enumerable-totalSupply}.
	 */
	function totalSupply() public view virtual override returns (uint256) {
		return _allTokens.length;
	}

	/**
	 * @dev See {IERC721Enumerable-tokenByIndex}.
	 */
	function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
		require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
		return _allTokens[index];
	}

	/**
	 * @dev Hook that is called before any token transfer. This includes minting
	 * and burning.
	 *
	 * Calling conditions:
	 *
	 * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
	 * transferred to `to`.
	 * - When `from` is zero, `tokenId` will be minted for `to`.
	 * - When `to` is zero, ``from``'s `tokenId` will be burned.
	 * - `from` cannot be the zero address.
	 * - `to` cannot be the zero address.
	 *
	 * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
	 */
	function _beforeTokenTransfer(
		address from,
		address to,
		uint256 tokenId
	) internal virtual override {
		super._beforeTokenTransfer(from, to, tokenId);

		if (from == address(0)) {
			_addTokenToAllTokensEnumeration(tokenId);
		} else if (from != to) {
			_removeTokenFromOwnerEnumeration(from, tokenId);
		}
		if (to == address(0)) {
			_removeTokenFromAllTokensEnumeration(tokenId);
		} else if (to != from) {
			_addTokenToOwnerEnumeration(to, tokenId);
		}
	}

	/**
	 * @dev Private function to add a token to this extension's ownership-tracking data structures.
	 * @param to address representing the new owner of the given token ID
	 * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
	 */
	function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
		uint256 length = ERC721.balanceOf(to);
		_ownedTokens[to][length] = tokenId;
		_ownedTokensIndex[tokenId] = length;
	}

	/**
	 * @dev Private function to add a token to this extension's token tracking data structures.
	 * @param tokenId uint256 ID of the token to be added to the tokens list
	 */
	function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
		_allTokensIndex[tokenId] = _allTokens.length;
		_allTokens.push(tokenId);
	}

	/**
	 * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
	 * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
	 * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
	 * This has O(1) time complexity, but alters the order of the _ownedTokens array.
	 * @param from address representing the previous owner of the given token ID
	 * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
	 */
	function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
		// To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
		// then delete the last slot (swap and pop).

		uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
		uint256 tokenIndex = _ownedTokensIndex[tokenId];

		// When the token to delete is the last token, the swap operation is unnecessary
		if (tokenIndex != lastTokenIndex) {
			uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

			_ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
			_ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
		}

		// This also deletes the contents at the last position of the array
		delete _ownedTokensIndex[tokenId];
		delete _ownedTokens[from][lastTokenIndex];
	}

	/**
	 * @dev Private function to remove a token from this extension's token tracking data structures.
	 * This has O(1) time complexity, but alters the order of the _allTokens array.
	 * @param tokenId uint256 ID of the token to be removed from the tokens list
	 */
	function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
		// To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
		// then delete the last slot (swap and pop).

		uint256 lastTokenIndex = _allTokens.length - 1;
		uint256 tokenIndex = _allTokensIndex[tokenId];

		// When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
		// rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
		// an 'if' statement (like in _removeTokenFromOwnerEnumeration)
		uint256 lastTokenId = _allTokens[lastTokenIndex];

		_allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
		_allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

		// This also deletes the contents at the last position of the array
		delete _allTokensIndex[tokenId];
		_allTokens.pop();
	}
}

abstract contract ReentrancyGuard {
	// Booleans are more expensive than uint256 or any type that takes up a full
	// word because each write operation emits an extra SLOAD to first read the
	// slot's contents, replace the bits taken up by the boolean, and then write
	// back. This is the compiler's defense against contract upgrades and
	// pointer aliasing, and it cannot be disabled.

	// The values being non-zero value makes deployment a bit more expensive,
	// but in exchange the refund on every call to nonReentrant will be lower in
	// amount. Since refunds are capped to a percentage of the total
	// transaction's gas, it is best to keep them low in cases like this one, to
	// increase the likelihood of the full refund coming into effect.
	uint256 private constant _NOT_ENTERED = 1;
	uint256 private constant _ENTERED = 2;

	uint256 private _status;

	constructor() {
		_status = _NOT_ENTERED;
	}

	/**
	 * @dev Prevents a contract from calling itself, directly or indirectly.
	 * Calling a `nonReentrant` function from another `nonReentrant`
	 * function is not supported. It is possible to prevent this from happening
	 * by making the `nonReentrant` function external, and making it call a
	 * `private` function that does the actual work.
	 */
	modifier nonReentrant() {
		// On the first call to nonReentrant, _notEntered will be true
		require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

		// Any calls to nonReentrant after this point will fail
		_status = _ENTERED;

		_;

		// By storing the original value once again, a refund is triggered (see
		// https://eips.ethereum.org/EIPS/eip-2200)
		_status = _NOT_ENTERED;
	}
}

//Interface for all ERC standards that have a balanceOf function that takes in an address and returns uint.
//This includes ERC-721 and ERC-20.
interface IERCStandard {
	function balanceOf(address account) external view returns (uint256);
}

//interface for ERC-1155 (semi-fungible) assets.
interface IERC1155 {
	function balanceOf(address _owner, uint256 _id) external view returns (uint256);
}

contract BlueChipSafe is ERC721Enumerable, Ownable, ReentrancyGuard {

	using Strings for uint256;

	string public _baseTokenURI;
	uint256 public PRICE = 0.05 ether;
	uint256 public BURN_REPLACE_PRICE = 0.05 ether;
	bool public PAUSED = true;
	bool public SELF_MINT_PAUSED = true;
	uint256 public NUM_MINTED = 1; //start index at 1 so that no one owns token #0
	mapping(address => uint256) private tokenOwnerToIdMapping;
	mapping(uint256 => address) private tokenIdToOwnerMapping;
	mapping(address => uint256) private discountPricingMapping;

	constructor() ERC721("Blue Chip Safe", "BCS") {}

	//Mints BCS Token to associatedWallet.
	function mintVerificationToken(address associatedWallet) external payable nonReentrant {
		require( !PAUSED, "Minting paused" );
		require( msg.value >= PRICE, "Incorrect ether amount" );
		require( tokenOwnerToIdMapping[associatedWallet] == 0, "There is already a token associated with this wallet");
		_safeMint(associatedWallet, NUM_MINTED);
		tokenOwnerToIdMapping[associatedWallet] = NUM_MINTED;
		tokenIdToOwnerMapping[NUM_MINTED] = associatedWallet;
		NUM_MINTED += 1;
	}

	//Mints BCS Token to caller.
	function mintVerificationTokenToSelf() external payable nonReentrant {
		require( !SELF_MINT_PAUSED, "Minting paused" );
		require( msg.value >= PRICE, "Incorrect ether amount" );
		address sender = msg.sender;
		require( tokenOwnerToIdMapping[sender] == 0, "There is already a token associated with this wallet");
		_safeMint(sender, NUM_MINTED);
		tokenOwnerToIdMapping[sender] = NUM_MINTED;
		tokenIdToOwnerMapping[NUM_MINTED] = sender;
		NUM_MINTED += 1;
	}

	//Mints BCS Token to associatedWallet with discount pricing.
	function mintVerificationTokenWithDiscount(address associatedWallet, address discountContractAddress) external payable nonReentrant {
		require( !PAUSED, "Minting paused" );
		require( discountPricingMapping[discountContractAddress] > 0, "No discounts available for discount contract address");
		require( IERCStandard(discountContractAddress).balanceOf(associatedWallet) > 0, "Associated wallet is inelegible for discount." );
		require( msg.value >= discountPricingMapping[discountContractAddress], "Incorrect ether amount" );
		require( tokenOwnerToIdMapping[associatedWallet] == 0, "There is already a token associated with this wallet");
		_safeMint(associatedWallet, NUM_MINTED);
		tokenOwnerToIdMapping[associatedWallet] = NUM_MINTED;
		tokenIdToOwnerMapping[NUM_MINTED] = associatedWallet;
		NUM_MINTED += 1;
	}

	//Mints BCS Token to caller with discount pricing.
	function mintVerificationTokenToSelfWithDiscount(address discountContractAddress) external payable nonReentrant {
		require( !SELF_MINT_PAUSED, "Minting paused" );
		address sender = msg.sender;
		require( discountPricingMapping[discountContractAddress] > 0, "No discounts available for discount contract address");
		require( IERCStandard(discountContractAddress).balanceOf(sender) > 0, "Caller is inelegible for discount." );
		require( msg.value >= discountPricingMapping[discountContractAddress], "Incorrect ether amount" );
		require( tokenOwnerToIdMapping[sender] == 0, "There is already a token associated with this wallet");
		_safeMint(sender, NUM_MINTED);
		tokenOwnerToIdMapping[sender] = NUM_MINTED;
		tokenIdToOwnerMapping[NUM_MINTED] = sender;
		NUM_MINTED += 1;
	}

	//Burns and replaces existing BCS Token to its associated wallet. Only the associated wallet of a particular BCS Token can burn and replace it.
	function burnAndReplace() external payable nonReentrant {
		address associatedWallet = msg.sender;
		require( msg.value >= BURN_REPLACE_PRICE, "Incorrect ether amount" );
		require( tokenOwnerToIdMapping[associatedWallet] > 0, "There is no token associated with this wallet");
		_burn(tokenOwnerToIdMapping[associatedWallet]);
		_safeMint(associatedWallet, NUM_MINTED);
		tokenOwnerToIdMapping[associatedWallet] = NUM_MINTED;
		tokenIdToOwnerMapping[NUM_MINTED] = associatedWallet;
		NUM_MINTED += 1;
	}