// Contract: dice
// Target function: function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool)
(address from, address to, uint256 tokenId, bytes calldata data) external;
}

interface IERC721Metadata is IERC721 {
    //@dev Returns the token collection name.
    function name() external view returns (string memory);

    //@dev Returns the token collection symbol.
    function symbol() external view returns (string memory);

    //@dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external returns (bytes4);
}

library Address {
    /**
     * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] 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);
    }

    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private 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);
            }
        }
    }
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

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() {
        _setOwner(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        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 {
        _setOwner(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");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

abstract contract Functionality {
    function toString(uint256 value) internal pure returns (string memory) {
        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);
    }
    
    bool private _reentryKey = false;
    modifier reentryLock {
        require(!_reentryKey, "attempt to reenter a locked function");
        _reentryKey = true;
        _;
        _reentryKey = false;
    }
}


// ******************************************************************************************************************************
// **************************************************  Start of Main Contract ***************************************************
// ******************************************************************************************************************************

contract dice is IERC721, Ownable, Functionality {

    using Address for address;
    
    // Token name
    string private _name;

    // Token symbol
    string private _symbol;
    
    // URI Root Location for Json Files
    string private _baseURI;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;
    
    //for setting purchase limits per collection
    mapping(uint256 => mapping(address => uint256)) public numPurchased;
    
    struct diceGroup {
        bool diceLock;
        
        uint256 numTokens; //tokens minted so far
        uint256 maxTokens; //max tokens of this type
        uint256 startId; //Start location for tokenID
        uint256 price; //Cost in wei
        uint256 payoutPercent;
        uint256 payoutBalance;
        uint256 giveawayBalance;
        uint256 purchaseThreshold;
        
        string tokenURI;
        address payoutAddress;
    }
    
    diceGroup[] collection;
    
    //TokenID to collection ID
    mapping (uint256 => uint256) diceType;
    
    //Holder's Dice Bag
    mapping (address => uint256[]) diceBag;
    
    //Global Variables
    uint256 totalTokensReserved;
    uint256 primaryBalance;
    
    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor() {
        _name = "DICE";
        _symbol = "DICE";
        _baseURI = "https://triple7dice.club/metadata/contract.json";
    }

    // **************************************** Internal Functions *******************
    function createDice(uint256 maxTokens, uint256 price, string memory uri_, uint256 maxPurchase) external onlyOwner reentryLock {
        //initialize the new token
        diceGroup memory newDice;
        newDice.numTokens = 0;
        newDice.maxTokens = maxTokens;
        newDice.startId = totalTokensReserved;
        newDice.payoutAddress = address(0);
        newDice.payoutPercent = 0;
        newDice.giveawayBalance = 0;
        newDice.price = price;
        newDice.tokenURI = uri_;
        newDice.diceLock = true;
        newDice.purchaseThreshold = maxPurchase;
        
        //Incriment the allocation variable
        totalTokensReserved += maxTokens;
        
        //Add the new token to the collection
        collection.push(newDice);
    }
    
    function mint(uint256 ID, uint256 amount) external payable {
        diceGroup memory tempId = collection[ID];
        uint256 price = tempId.price;
        
        require(amount > 0, "You must mint a positive number");
        require(numPurchased[ID][_msgSender()] + amount <= tempId.purchaseThreshold, "Can't mint that many");
        require(amount + tempId.numTokens + tempId.giveawayBalance <= tempId.maxTokens, "Not enough dice remaining");
        require(msg.value >= price * amount, "You can't afford that");
        require(!tempId.diceLock, "Those dice are not for sale");
        
        //handle payouts
        uint256 reserve = (amount * price * tempId.payoutPercent) / 100;
        uint256 leftoverBalance = (price * amount) - reserve;
        collection[ID].payoutBalance += reserve;
        primaryBalance += leftoverBalance;
        
        //mint tokens and update tallies
        uint256 tokenStart = collection[ID].startId + collection[ID].numTokens;
        for ( uint256 i; i < amount; i++) {
            _safeMint(_msgSender(), tokenStart + i);
            diceType[tokenStart + i] = ID;
        }
        collection[ID].numTokens +=amount;
        
        if ((price * amount) < msg.value) {
            uint256 change = (msg.value - (price*amount));
            (bool success, ) = msg.sender.call{value: change}("");
            require(success, "Mint: unable to send change to user");
        }
        
    }
    
    function founderMint(uint256 ID, address[] memory to) external reentryLock{
        uint256 arraySize = to.length;
        require(_msgSender() == collection[ID].payoutAddress || _msgSender() == owner());
        diceGroup memory tempId = collection[ID];
        require(tempId.numTokens + tempId.giveawayBalance + arraySize <= tempId.maxTokens, "Not enough dice remaining");

        uint256 tokenStart = tempId.startId + tempId.numTokens;
        collection[ID].numTokens += arraySize;

        if (collection[ID].giveawayBalance >= arraySize) {
            collection[ID].giveawayBalance -= arraySize;
        } else {
            collection[ID].giveawayBalance = 0;
        }
        
        for (uint256 i; i < arraySize; i++) {
            diceType[tokenStart + i] = ID;
            _safeMint(to[i], tokenStart + i);
        }
    }
    
    function assignFounder(uint256 ID, uint256 founderPercentage, address receiver, uint256 freebies) external onlyOwner {
        //Approve a sponsored account to receive payment or ammend contract terms
        collection[ID].payoutPercent = founderPercentage;
        collection[ID].payoutAddress = receiver;
        collection[ID].giveawayBalance = freebies;
    }
    
    function ownerFunds() external view onlyOwner returns(uint256) {
        return primaryBalance;
    }
    
    function withdraw(uint256 sendAmount) external onlyOwner {
        require(sendAmount <= primaryBalance);
        primaryBalance -= sendAmount;
        
        (bool success, ) = msg.sender.call{value: sendAmount}("");
        require(success, "Transaction Unsuccessful");
    }
    
    function receiveFunds(uint256 ID) external reentryLock {
        //Verify ownership of the token class
        require(collection[ID].payoutAddress != address(0));
        require(_msgSender() == collection[ID].payoutAddress, "Unauthorized Transaction!");
        
        uint256 sendAmount = collection[ID].payoutBalance;
        collection[ID].payoutBalance = 0;
        
        (bool success, ) = msg.sender.call{value: sendAmount}("");
        require(success, "Transaction Unsuccessful");
    }