// SPDX-License-Identifier: MIT
/**
 * @title RealEstateTycoons
 * @author AhmYieTycoon
 * @dev Used for Ethereum projects compatible with OpenSea
 */
pragma solidity ^0.8.0;
interface IERC165 {
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
pragma solidity ^0.8.0;
interface IERC721Receiver {
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}
pragma solidity ^0.8.0;
interface IERC721 is IERC165 {
    event Transfer(
        address indexed from,
        address indexed to,
        uint256 indexed tokenId
    );
    event Approval(
        address indexed owner,
        address indexed approved,
        uint256 indexed tokenId
    );
    event ApprovalForAll(
        address indexed owner,
        address indexed operator,
        bool approved
    );
    function balanceOf(address owner) external view returns (uint256 balance);
    function ownerOf(uint256 tokenId) external view returns (address owner);
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    function approve(address to, uint256 tokenId) external;
    function getApproved(uint256 tokenId)
        external
        view
        returns (address operator);
    function setApprovalForAll(address operator, bool _approved) external;
    function isApprovedForAll(address owner, address operator)
        external
        view
        returns (bool);
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}
pragma solidity ^0.8.0;
interface IERC721Metadata is IERC721 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function tokenURI(uint256 tokenId) external view returns (string memory);
}
pragma solidity ^0.8.0;
interface IERC721Enumerable is IERC721 {
    function totalSupply() external view returns (uint256);
    function tokenOfOwnerByIndex(address owner, uint256 index)
        external
        view
        returns (uint256);
    function tokenByIndex(uint256 index) external view returns (uint256);
}
pragma solidity ^0.8.1;
library Address {
    function isContract(address account) internal view returns (bool) {

        return account.code.length > 0;
    }
    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"
        );
    }
    function functionCall(address target, bytes memory data)
        internal
        returns (bytes memory)
    {
        return functionCall(target, data, "Address: low-level call failed");
    }
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    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"
            );
    }
    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);
    }
    function functionStaticCall(address target, bytes memory data)
        internal
        view
        returns (bytes memory)
    {
        return
            functionStaticCall(
                target,
                data,
                "Address: low-level static call failed"
            );
    }
    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);
    }
    function functionDelegateCall(address target, bytes memory data)
        internal
        returns (bytes memory)
    {
        return
            functionDelegateCall(
                target,
                data,
                "Address: low-level delegate call failed"
            );
    }
    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
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            if (returndata.length > 0) {

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
pragma solidity ^0.8.0;
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

pragma solidity ^0.8.0;

abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );
    constructor() {
        _setOwner(_msgSender());
    }
    function owner() public view virtual returns (address) {
        return _owner;
    }
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }
    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);
    }
}
pragma solidity ^0.8.0;
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    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);
    }
    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);
    }
    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);
    }
}
pragma solidity ^0.8.0;
abstract contract ERC165 is IERC165 {
    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override
        returns (bool)
    {
        return interfaceId == type(IERC165).interfaceId;
    }
}

pragma solidity ^0.8.0;

abstract contract ReentrancyGuard {
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }
    modifier nonReentrant() {
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        _status = _ENTERED;

        _;
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

pragma solidity ^0.8.0;
contract ERC721A is
    Context,
    ERC165,
    IERC721,
    IERC721Metadata,
    IERC721Enumerable
{
    using Address for address;
    using Strings for uint256;

    struct TokenOwnership {
        address addr;
        uint64 startTimestamp;
    }

    struct AddressData {
        uint128 balance;
        uint128 numberMinted;
    }

    uint256 private currentIndex = 0;

    uint256 internal immutable collectionSize;
    uint256 internal immutable maxBatchSize;
    string private _name;
    string private _symbol;
    mapping(uint256 => TokenOwnership) private _ownerships;
    mapping(address => AddressData) private _addressData;
    mapping(uint256 => address) private _tokenApprovals;
    mapping(address => mapping(address => bool)) private _operatorApprovals;
    constructor(
        string memory name_,
        string memory symbol_,
        uint256 maxBatchSize_,
        uint256 collectionSize_
    ) {
        require(
            collectionSize_ > 0,
            "ERC721A: collection must have a nonzero supply"
        );
        require(maxBatchSize_ > 0, "ERC721A: max batch size must be nonzero");
        _name = name_;
        _symbol = symbol_;
        maxBatchSize = maxBatchSize_;
        collectionSize = collectionSize_;
    }
    function totalSupply() public view override returns (uint256) {
        return currentIndex;
    }
    function tokenByIndex(uint256 index) public view override returns (uint256){
        require(index < totalSupply(), "ERC721A: global index out of bounds");
        return index;
    }
    function tokenOfOwnerByIndex(address owner, uint256 index) public view override returns (uint256) {
        require(index < balanceOf(owner), "ERC721A: owner index out of bounds");
        uint256 numMintedSoFar = totalSupply();
        uint256 tokenIdsIdx = 0;
        address currOwnershipAddr = address(0);
        for (uint256 i = 0; i < numMintedSoFar; i++) {
            TokenOwnership memory ownership = _ownerships[i];
            if (ownership.addr != address(0)) {
                currOwnershipAddr = ownership.addr;
            }
            if (currOwnershipAddr == owner) {
                if (tokenIdsIdx == index) {
                    return i;
                }
                tokenIdsIdx++;
            }
        }
        revert("ERC721A: unable to get token of owner by index");
    }
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return interfaceId == type(IERC721).interfaceId || interfaceId == type(IERC721Metadata).interfaceId || interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }
    function balanceOf(address owner) public view override returns (uint256) {
        require(owner != address(0), "ERC721A: balance query for the zero address");
        return uint256(_addressData[owner].balance);
    }

    function _numberMinted(address owner) internal view returns (uint256) {
        require(owner != address(0), "ERC721A: number minted query for the zero address");
        return uint256(_addressData[owner].numberMinted);
    }

    function ownershipOf(uint256 tokenId) internal view returns (TokenOwnership memory) {
        require(_exists(tokenId), "ERC721A: owner query for nonexistent token");
        uint256 lowestTokenToCheck;
        if (tokenId >= maxBatchSize) {
            lowestTokenToCheck = tokenId - maxBatchSize + 1;
        }
        for (uint256 curr = tokenId; curr >= lowestTokenToCheck; curr--) {
            TokenOwnership memory ownership = _ownerships[curr];
            if (ownership.addr != address(0)) {
                return ownership;
            }
        }
        revert("ERC721A: unable to determine the owner of token");
    }
    function ownerOf(uint256 tokenId) public view override returns (address) {
        return ownershipOf(tokenId).addr;
    }
    function name() public view virtual override returns (string memory) {
        return _name;
    }
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }
    function approve(address to, uint256 tokenId) public override {
        address owner = ERC721A.ownerOf(tokenId);
        require(to != owner, "ERC721A: approval to current owner");
        require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()), "ERC721A: approve caller is not owner nor approved for all");
        _approve(to, tokenId, owner);
    }
    function getApproved(uint256 tokenId) public view override returns (address) {
        require(_exists(tokenId), "ERC721A: approved query for nonexistent token");
        return _tokenApprovals[tokenId];
    }
    function setApprovalForAll(address operator, bool approved) public override {
        require(operator != _msgSender(), "ERC721A: approve to caller");
        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }
    function transferFrom(address from, address to, uint256 tokenId) public override {
        _transfer(from, to, tokenId);
    }
    function safeTransferFrom(address from, address to, uint256 tokenId) public override {
        safeTransferFrom(from, to, tokenId, "");
    }
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public override {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721A: transfer to non ERC721Receiver implementer");
    }
    function _exists(uint256 tokenId) internal view returns (bool) {
        return tokenId < currentIndex;
    }
    function _safeMint(address to, uint256 quantity) internal {
        _safeMint(to, quantity, "");
    }
    function _safeMint(address to, uint256 quantity, bytes memory _data) internal {
        uint256 startTokenId = currentIndex;
        require(to != address(0), "ERC721A: mint to the zero address");
        require(!_exists(startTokenId), "ERC721A: token already minted");
        require(quantity <= maxBatchSize, "ERC721A: quantity to mint too high");
        _beforeTokenTransfers(address(0), to, startTokenId, quantity);
        AddressData memory addressData = _addressData[to];
        _addressData[to] = AddressData(
            addressData.balance + uint128(quantity),
            addressData.numberMinted + uint128(quantity)
        );
        _ownerships[startTokenId] = TokenOwnership(to, uint64(block.timestamp));
        uint256 updatedIndex = startTokenId;
        for (uint256 i = 0; i < quantity; i++) {
            emit Transfer(address(0), to, updatedIndex);
            require(_checkOnERC721Received(address(0), to, updatedIndex, _data), "ERC721A: transfer to non ERC721Receiver implementer");
            updatedIndex++;
        }
        currentIndex = updatedIndex;
        _afterTokenTransfers(address(0), to, startTokenId, quantity);
    }
    function _transfer(address from, address to, uint256 tokenId) private {
        TokenOwnership memory prevOwnership = ownershipOf(tokenId);
        bool isApprovedOrOwner = (_msgSender() == prevOwnership.addr ||
            getApproved(tokenId) == _msgSender() ||
            isApprovedForAll(prevOwnership.addr, _msgSender()));
        require(isApprovedOrOwner, "ERC721A: transfer caller is not owner nor approved");
        require(prevOwnership.addr == from, "ERC721A: transfer from incorrect owner");
        require(to != address(0), "ERC721A: transfer to the zero address");
        _beforeTokenTransfers(from, to, tokenId, 1);
        _approve(address(0), tokenId, prevOwnership.addr);
        _addressData[from].balance -= 1;
        _addressData[to].balance += 1;
        _ownerships[tokenId] = TokenOwnership(to, uint64(block.timestamp));
        uint256 nextTokenId = tokenId + 1;
        if (_ownerships[nextTokenId].addr == address(0)) {
            if (_exists(nextTokenId)) {
                _ownerships[nextTokenId] = TokenOwnership(
                    prevOwnership.addr,
                    prevOwnership.startTimestamp
                );
            }
        }
        emit Transfer(from, to, tokenId);
        _afterTokenTransfers(from, to, tokenId, 1);
    }
    function _approve(address to, uint256 tokenId, address owner) private {
        _tokenApprovals[tokenId] = to;
        emit Approval(owner, to, tokenId);
    }
    uint256 public nextOwnerToExplicitlySet = 0;
    function _setOwnersExplicit(uint256 quantity) internal {
        uint256 oldNextOwnerToSet = nextOwnerToExplicitlySet;
        require(quantity > 0, "quantity must be nonzero");
        uint256 endIndex = oldNextOwnerToSet + quantity - 1;
        if (endIndex > collectionSize - 1) {
            endIndex = collectionSize - 1;
        }
        require(_exists(endIndex), "not enough minted yet for this cleanup");
        for (uint256 i = oldNextOwnerToSet; i <= endIndex; i++) {
            if (_ownerships[i].addr == address(0)) {
                TokenOwnership memory ownership = ownershipOf(i);
                _ownerships[i] = TokenOwnership(
                    ownership.addr,
                    ownership.startTimestamp
                );
            }
        }
        nextOwnerToExplicitlySet = endIndex + 1;
    }
    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(to).onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721A: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }
    function _beforeTokenTransfers(address from, address to, uint256 startTokenId, uint256 quantity) internal virtual {}
    function _afterTokenTransfers(address from, address to, uint256 startTokenId, uint256 quantity) internal virtual {}
}

pragma solidity ^0.8.0;
library MerkleProof {
    function verify(
        bytes32[] memory proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }
    function processProof(bytes32[] memory proof, bytes32 leaf)
        internal
        pure
        returns (bytes32)
    {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];
            if (computedHash <= proofElement) {
                computedHash = _efficientHash(computedHash, proofElement);
            } else {
                computedHash = _efficientHash(proofElement, computedHash);
            }
        }
        return computedHash;
    }

    function _efficientHash(bytes32 a, bytes32 b)
        private
        pure
        returns (bytes32 value)
    {
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            value := keccak256(0x00, 0x40)
        }
    }
}

pragma solidity ^0.8.0;
contract RealEstateTycoons is Ownable, ERC721A, ReentrancyGuard {

    bool public publicSale = false;
    bool public whitelistSale = false;
    bool public revealed = false;

    uint256 constant public reserve = 777;
    
    uint256 public maxPerTxWL = 10;
    uint256 public maxPerWalletWL = 10;

    uint256 public maxPerTx = 10;
    uint256 public maxPerWallet = 10;

    uint256 public maxToken = 7777;
    uint256 public price = 0.055 ether;

    string private _baseTokenURI;
    string public notRevealedUri = "";

    bytes32 root;

    constructor(string memory _NAME, string memory _SYMBOL)
        ERC721A(_NAME, _SYMBOL, maxPerWallet, maxToken)
    {}

    modifier callerIsUser() {
        require(tx.origin == msg.sender, "The caller is another contract");
        _;
    }

    function numberMinted(address owner) public view returns (uint256) {
        return _numberMinted(owner);
    }

    function getOwnershipData(uint256 tokenId) external view returns (TokenOwnership memory) {
        return ownershipOf(tokenId);
    }

    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        if (revealed == false) {
            return notRevealedUri;
        }

        string memory _tokenURI = super.tokenURI(tokenId);
        return bytes(_tokenURI).length > 0 ? string(abi.encodePacked(_tokenURI, ".json")) : "";
    }

    function verify(bytes32[] memory proof) internal view returns (bool) {
        bytes32 leaf = keccak256(abi.encodePacked(msg.sender));
        return MerkleProof.verify(proof, root, leaf);
    }

    function mint(uint256 quantity) external payable callerIsUser {
        require(publicSale, "SALE_HAS_NOT_STARTED_YET");
        require(quantity > 0, "INVALID_QUANTITY");
        require(quantity <= maxPerTx, "CANNOT_MINT_THAT_MANY");
        require(numberMinted(msg.sender) + quantity <= maxPerWallet, "PER_WALLET_LIMIT_REACHED");
        require(totalSupply() + quantity <= maxToken, "NOT_ENOUGH_SUPPLY_TO_MINT_DESIRED_AMOUNT");
        require(msg.value == (price * quantity), "INVALID_ETH");
        _safeMint(msg.sender, quantity);
    }

    function whitelistMint(uint256 quantity, bytes32[] memory proof) external payable callerIsUser {
        require(whitelistSale, "SALE_HAS_NOT_STARTED_YET");
        require(quantity > 0, "INVALID_QUANTITY");
        require(quantity <= maxPerTxWL, "CANNOT_MINT_THAT_MANY");
        require(numberMinted(msg.sender) + quantity <= maxPerWalletWL, "WHITELIST_PER_WALLET_LIMIT_REACHED");
        require(totalSupply() + quantity <= maxToken, "NOT_ENOUGH_SUPPLY_TO_MINT_DESIRED_AMOUNT");
        require(msg.value == (price * quantity), "INVALID_ETH");
        require(verify(proof), "ADDRESS_NOT_WHITELISTED");
        _safeMint(msg.sender, quantity);
    }

    function teamAllocationMint(address _address, uint256 quantity) external onlyOwner {
        require(totalSupply() + quantity <= maxToken, "NOT_ENOUGH_SUPPLY_TO_GIVEAWAY_DESIRED_AMOUNT");
        _safeMint(_address, quantity);
    }

    function _baseURI() internal view virtual override returns (string memory) {
        return _baseTokenURI;
    }

    function setPrice(uint256 _PriceInWEI) external onlyOwner {
        price = _PriceInWEI;
    }

    function setMaxPerTxWL(uint256 _maxPerTxWL) external onlyOwner {
        maxPerTxWL = _maxPerTxWL;
    }

    function setMaxPerTx(uint256 _maxPerTx) external onlyOwner {
        maxPerTx = _maxPerTx;
    }

    function setMaxPerWalletWL(uint256 _maxPerWalletWL) external onlyOwner {
        maxPerWalletWL = _maxPerWalletWL;
    }

    function setRoot(bytes32 _root) external onlyOwner {
        root = _root;
    }

    function flipPublicSaleState() external onlyOwner {
        publicSale = !publicSale;
    }

    function flipWhitelistState() external onlyOwner {
        whitelistSale = !whitelistSale;
    }

    function setNotRevealedURI(string memory _notRevealedURI) external onlyOwner {
        notRevealedUri = _notRevealedURI;
    }

    function reveal() external onlyOwner {
        revealed = !revealed;
    }

    function setBaseURI(string calldata baseURI) external onlyOwner {
        _baseTokenURI = baseURI;
    }

    function withdraw() external onlyOwner {
        payable(msg.sender).transfer(address(this).balance);
    }
}