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pragma solidity ^0.4.24;

/**
* @title IERC165
* @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md
*/
interface IERC165 {

/**
* @notice Query if a contract implements an interface
* @param interfaceId The interface identifier, as specified in ERC-165
* @dev Interface identification is specified in ERC-165. This function
* uses less than 30,000 gas.
*/
function supportsInterface(bytes4 interfaceId)
    external
    view
    returns (bool);
}

/**
* @title ERC165
* @author Matt Condon (@shrugs)
* @dev Implements ERC165 using a lookup table.
*/
contract ERC165 is IERC165 {

bytes4 private constant _InterfaceId_ERC165 = 0x01ffc9a7;
/**
* 0x01ffc9a7 ===
*   bytes4(keccak256('supportsInterface(bytes4)'))
*/

/**
* @dev a mapping of interface id to whether or not it's supported
*/
mapping(bytes4 => bool) internal _supportedInterfaces;

/**
* @dev A contract implementing SupportsInterfaceWithLookup
* implement ERC165 itself
*/
constructor()
    public
{
    _registerInterface(_InterfaceId_ERC165);
}

/**
* @dev implement supportsInterface(bytes4) using a lookup table
*/
function supportsInterface(bytes4 interfaceId)
    external
    view
    returns (bool)
{
    return _supportedInterfaces[interfaceId];
}

/**
* @dev private method for registering an interface
*/
function _registerInterface(bytes4 interfaceId)
    internal
{
    require(interfaceId != 0xffffffff);
    _supportedInterfaces[interfaceId] = true;
}
}


/**
* @title ERC721 Non-Fungible Token Standard basic interface
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract 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) public view returns (uint256 balance);
function ownerOf(uint256 tokenId) public view returns (address owner);

function approve(address to, uint256 tokenId) public;
function getApproved(uint256 tokenId)
    public view returns (address operator);

function setApprovalForAll(address operator, bool _approved) public;
function isApprovedForAll(address owner, address operator)
    public view returns (bool);

function transferFrom(address from, address to, uint256 tokenId) public;
function safeTransferFrom(address from, address to, uint256 tokenId)
    public;

function safeTransferFrom(
    address from,
    address to,
    uint256 tokenId,
    bytes data
)
    public;
}

/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
contract IERC721Receiver {
/**
* @notice Handle the receipt of an NFT
* @dev The ERC721 smart contract calls this function on the recipient
* after a `safeTransfer`. This function MUST return the function selector,
* otherwise the caller will revert the transaction. The selector to be
* returned can be obtained as `this.onERC721Received.selector`. This
* function MAY throw to revert and reject the transfer.
* Note: the ERC721 contract address is always the message sender.
* @param operator The address which called `safeTransferFrom` function
* @param from The address which previously owned the token
* @param tokenId The NFT identifier which is being transferred
* @param data Additional data with no specified format
* @return `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
*/
function onERC721Received(
    address operator,
    address from,
    uint256 tokenId,
    bytes data
)
    public
    returns(bytes4);
}


/**
* @title SafeMath
* @dev Math operations with safety checks that revert on error
*/
library SafeMath {

/**
* @dev Multiplies two numbers, reverts on overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    if (a == 0) {
    return 0;
    }

    uint256 c = a * b;
    require(c / a == b);

    return c;
}

/**
* @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b > 0); // Solidity only automatically asserts when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold

    return c;
}

/**
* @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b <= a);
    uint256 c = a - b;

    return c;
}

/**
* @dev Adds two numbers, reverts on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a);

    return c;
}

/**
* @dev Divides two numbers and returns the remainder (unsigned integer modulo),
* reverts when dividing by zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0);
    return a % b;
}
}

/**
* Utility library of inline functions on addresses
*/
library Address {

/**
* Returns whether the target address is a contract
* @dev This function will return false if invoked during the constructor of a contract,
* as the code is not actually created until after the constructor finishes.
* @param account address of the account to check
* @return whether the target address is a contract
*/
function isContract(address account) internal view returns (bool) {
    uint256 size;
    // XXX Currently there is no better way to check if there is a contract in an address
    // than to check the size of the code at that address.
    // See https://ethereum.stackexchange.com/a/14016/36603
    // for more details about how this works.
    // TODO Check this again before the Serenity release, because all addresses will be
    // contracts then.
    // solium-disable-next-line security/no-inline-assembly
    assembly { size := extcodesize(account) }
    return size > 0;
}

}

/**
* @title ERC721 Non-Fungible Token Standard basic implementation
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721 is ERC165, IERC721 {

using SafeMath for uint256;
using Address for address;

// Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
// which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;

// Mapping from token ID to owner
mapping (uint256 => address) private _tokenOwner;

// Mapping from token ID to approved address
mapping (uint256 => address) private _tokenApprovals;

// Mapping from owner to number of owned token
mapping (address => uint256) private _ownedTokensCount;

// Mapping from owner to operator approvals
mapping (address => mapping (address => bool)) private _operatorApprovals;

bytes4 private constant _InterfaceId_ERC721 = 0x80ac58cd;
/*
* 0x80ac58cd ===
*   bytes4(keccak256('balanceOf(address)')) ^
*   bytes4(keccak256('ownerOf(uint256)')) ^
*   bytes4(keccak256('approve(address,uint256)')) ^
*   bytes4(keccak256('getApproved(uint256)')) ^
*   bytes4(keccak256('setApprovalForAll(address,bool)')) ^
*   bytes4(keccak256('isApprovedForAll(address,address)')) ^
*   bytes4(keccak256('transferFrom(address,address,uint256)')) ^
*   bytes4(keccak256('safeTransferFrom(address,address,uint256)')) ^
*   bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)'))
*/

constructor()
    public
{
    // register the supported interfaces to conform to ERC721 via ERC165
    _registerInterface(_InterfaceId_ERC721);
}

/**
* @dev Gets the balance of the specified address
* @param owner address to query the balance of
* @return uint256 representing the amount owned by the passed address
*/
function balanceOf(address owner) public view returns (uint256) {
    require(owner != address(0));
    return _ownedTokensCount[owner];
}

/**
* @dev Gets the owner of the specified token ID
* @param tokenId uint256 ID of the token to query the owner of
* @return owner address currently marked as the owner of the given token ID
*/
function ownerOf(uint256 tokenId) public view returns (address) {
    address owner = _tokenOwner[tokenId];
    require(owner != address(0));
    return owner;
}

/**
* @dev Approves another address to transfer the given token ID
* The zero address indicates there is no approved address.
* There can only be one approved address per token at a given time.
* Can only be called by the token owner or an approved operator.
* @param to address to be approved for the given token ID
* @param tokenId uint256 ID of the token to be approved
*/
function approve(address to, uint256 tokenId) public {
    address owner = ownerOf(tokenId);
    require(to != owner);
    require(msg.sender == owner || isApprovedForAll(owner, msg.sender));

    _tokenApprovals[tokenId] = to;
    emit Approval(owner, to, tokenId);
}

/**
* @dev Gets the approved address for a token ID, or zero if no address set
* Reverts if the token ID does not exist.
* @param tokenId uint256 ID of the token to query the approval of
* @return address currently approved for the given token ID
*/
function getApproved(uint256 tokenId) public view returns (address) {
    require(_exists(tokenId));
    return _tokenApprovals[tokenId];
}

/**
* @dev Sets or unsets the approval of a given operator
* An operator is allowed to transfer all tokens of the sender on their behalf
* @param to operator address to set the approval
* @param approved representing the status of the approval to be set
*/
function setApprovalForAll(address to, bool approved) public {
    require(to != msg.sender);
    _operatorApprovals[msg.sender][to] = approved;
    emit ApprovalForAll(msg.sender, to, approved);
}

/**
* @dev Tells whether an operator is approved by a given owner
* @param owner owner address which you want to query the approval of
* @param operator operator address which you want to query the approval of
* @return bool whether the given operator is approved by the given owner
*/
function isApprovedForAll(
    address owner,
    address operator
)
    public
    view
    returns (bool)
{
    return _operatorApprovals[owner][operator];
}

/**
* @dev Transfers the ownership of a given token ID to another address
* Usage of this method is discouraged, use `safeTransferFrom` whenever possible
* Requires the msg sender to be the owner, approved, or operator
* @param from current owner of the token
* @param to address to receive the ownership of the given token ID
* @param tokenId uint256 ID of the token to be transferred
*/
function transferFrom(
    address from,
    address to,
    uint256 tokenId
)
    public
{
    require(_isApprovedOrOwner(msg.sender, tokenId));
    require(to != address(0));

    _clearApproval(from, tokenId);
    _removeTokenFrom(from, tokenId);
    _addTokenTo(to, tokenId);

    emit Transfer(from, to, tokenId);
}

/**
* @dev Safely transfers the ownership of a given token ID to another address
* If the target address is a contract, it must implement `onERC721Received`,
* which is called upon a safe transfer, and return the magic value
* `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
* the transfer is reverted.
*
* Requires the msg sender to be the owner, approved, or operator
* @param from current owner of the token
* @param to address to receive the ownership of the given token ID
* @param tokenId uint256 ID of the token to be transferred
*/
function safeTransferFrom(
    address from,
    address to,
    uint256 tokenId
)
    public
{
    // solium-disable-next-line arg-overflow
    safeTransferFrom(from, to, tokenId, "");
}

/**
* @dev Safely transfers the ownership of a given token ID to another address
* If the target address is a contract, it must implement `onERC721Received`,
* which is called upon a safe transfer, and return the magic value
* `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
* the transfer is reverted.
* Requires the msg sender to be the owner, approved, or operator
* @param from current owner of the token
* @param to address to receive the ownership of the given token ID
* @param tokenId uint256 ID of the token to be transferred
* @param _data bytes data to send along with a safe transfer check
*/
function safeTransferFrom(
    address from,
    address to,
    uint256 tokenId,
    bytes _data
)
    public
{
    transferFrom(from, to, tokenId);
    // solium-disable-next-line arg-overflow
    require(_checkAndCallSafeTransfer(from, to, tokenId, _data));
}

/**
* @dev Returns whether the specified token exists
* @param tokenId uint256 ID of the token to query the existence of
* @return whether the token exists
*/
function _exists(uint256 tokenId) internal view returns (bool) {
    address owner = _tokenOwner[tokenId];
    return owner != address(0);
}

/**
* @dev Returns whether the given spender can transfer a given token ID
* @param spender address of the spender to query
* @param tokenId uint256 ID of the token to be transferred
* @return bool whether the msg.sender is approved for the given token ID,
*  is an operator of the owner, or is the owner of the token
*/
function _isApprovedOrOwner(
    address spender,
    uint256 tokenId
)
    internal
    view
    returns (bool)
{
    address owner = ownerOf(tokenId);
    // Disable solium check because of
    // https://github.com/duaraghav8/Solium/issues/175
    // solium-disable-next-line operator-whitespace
    return (
    spender == owner ||
    getApproved(tokenId) == spender ||
    isApprovedForAll(owner, spender)
    );
}

/**
* @dev Internal function to mint a new token
* Reverts if the given token ID already exists
* @param to The address that will own the minted token
* @param tokenId uint256 ID of the token to be minted by the msg.sender
*/
function _mint(address to, uint256 tokenId) internal {
    require(to != address(0));
    _addTokenTo(to, tokenId);
    emit Transfer(address(0), to, tokenId);
}

/**
* @dev Internal function to burn a specific token
* Reverts if the token does not exist
* @param tokenId uint256 ID of the token being burned by the msg.sender
*/
function _burn(address owner, uint256 tokenId) internal {
    _clearApproval(owner, tokenId);
    _removeTokenFrom(owner, tokenId);
    emit Transfer(owner, address(0), tokenId);
}

/**
* @dev Internal function to clear current approval of a given token ID
* Reverts if the given address is not indeed the owner of the token
* @param owner owner of the token
* @param tokenId uint256 ID of the token to be transferred
*/
function _clearApproval(address owner, uint256 tokenId) internal {
    require(ownerOf(tokenId) == owner);
    if (_tokenApprovals[tokenId] != address(0)) {
    _tokenApprovals[tokenId] = address(0);
    }
}

/**
* @dev Internal function to add a token ID to the list of a given address
* @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 _addTokenTo(address to, uint256 tokenId) internal {
    require(_tokenOwner[tokenId] == address(0));
    _tokenOwner[tokenId] = to;
    _ownedTokensCount[to] = _ownedTokensCount[to].add(1);
}

/**
* @dev Internal function to remove a token ID from the list of a given address
* @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 _removeTokenFrom(address from, uint256 tokenId) internal {
    require(ownerOf(tokenId) == from);
    _ownedTokensCount[from] = _ownedTokensCount[from].sub(1);
    _tokenOwner[tokenId] = address(0);
}

/**
* @dev Internal function to invoke `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 whether the call correctly returned the expected magic value
*/
function _checkAndCallSafeTransfer(
    address from,
    address to,
    uint256 tokenId,
    bytes _data
)
    internal
    returns (bool)
{
    if (!to.isContract()) {
    return true;
    }
    bytes4 retval = IERC721Receiver(to).onERC721Received(
    msg.sender, from, tokenId, _data);
    return (retval == _ERC721_RECEIVED);
}
}

/**
* @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
* @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract IERC721Enumerable is IERC721 {
function totalSupply() public view returns (uint256);
function tokenOfOwnerByIndex(
    address owner,
    uint256 index
)
    public
    view
    returns (uint256 tokenId);

function tokenByIndex(uint256 index) public view returns (uint256);
}

contract ERC721Enumerable is ERC165, ERC721, IERC721Enumerable {
// Mapping from owner to list of owned token IDs
mapping(address => 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;

bytes4 private constant _InterfaceId_ERC721Enumerable = 0x780e9d63;
/**
* 0x780e9d63 ===
*   bytes4(keccak256('totalSupply()')) ^
*   bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) ^
*   bytes4(keccak256('tokenByIndex(uint256)'))
*/

/**
* @dev Constructor function
*/
constructor() public {
    // register the supported interface to conform to ERC721 via ERC165
    _registerInterface(_InterfaceId_ERC721Enumerable);
}

/**
* @dev Gets the token ID at a given index of the tokens list of the requested owner
* @param owner address owning the tokens list to be accessed
* @param index uint256 representing the index to be accessed of the requested tokens list
* @return uint256 token ID at the given index of the tokens list owned by the requested address
*/
function tokenOfOwnerByIndex(
    address owner,
    uint256 index
)
    public
    view
    returns (uint256)
{
    require(index < balanceOf(owner));
    return _ownedTokens[owner][index];
}

/**
* @dev Gets the total amount of tokens stored by the contract
* @return uint256 representing the total amount of tokens
*/
function totalSupply() public view returns (uint256) {
    return _allTokens.length;
}

/**
* @dev Gets the token ID at a given index of all the tokens in this contract
* Reverts if the index is greater or equal to the total number of tokens
* @param index uint256 representing the index to be accessed of the tokens list
* @return uint256 token ID at the given index of the tokens list
*/
function tokenByIndex(uint256 index) public view returns (uint256) {
    require(index < totalSupply());
    return _allTokens[index];
}

/**
* @dev Internal function to add a token ID to the list of a given address
* @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 _addTokenTo(address to, uint256 tokenId) internal {
    super._addTokenTo(to, tokenId);
    uint256 length = _ownedTokens[to].length;
    _ownedTokens[to].push(tokenId);
    _ownedTokensIndex[tokenId] = length;
}

/**
* @dev Internal function to remove a token ID from the list of a given address
* @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 _removeTokenFrom(address from, uint256 tokenId) internal {
    super._removeTokenFrom(from, tokenId);

    // To prevent a gap in the array, we store the last token in the index of the token to delete, and
    // then delete the last slot.
    uint256 tokenIndex = _ownedTokensIndex[tokenId];
    uint256 lastTokenIndex = _ownedTokens[from].length.sub(1);
    uint256 lastToken = _ownedTokens[from][lastTokenIndex];

    _ownedTokens[from][tokenIndex] = lastToken;
    // This also deletes the contents at the last position of the array
    _ownedTokens[from].length--;

    // Note that this will handle single-element arrays. In that case, both tokenIndex and lastTokenIndex are going to
    // be zero. Then we can make sure that we will remove tokenId from the ownedTokens list since we are first swapping
    // the lastToken to the first position, and then dropping the element placed in the last position of the list

    _ownedTokensIndex[tokenId] = 0;
    _ownedTokensIndex[lastToken] = tokenIndex;
}

/**
* @dev Internal function to mint a new token
* Reverts if the given token ID already exists
* @param to address the beneficiary that will own the minted token
* @param tokenId uint256 ID of the token to be minted by the msg.sender
*/
function _mint(address to, uint256 tokenId) internal {
    super._mint(to, tokenId);

    _allTokensIndex[tokenId] = _allTokens.length;
    _allTokens.push(tokenId);
}

/**
* @dev Internal function to burn a specific token
* Reverts if the token does not exist
* @param owner owner of the token to burn
* @param tokenId uint256 ID of the token being burned by the msg.sender
*/
function _burn(address owner, uint256 tokenId) internal {
    super._burn(owner, tokenId);

    // Reorg all tokens array
    uint256 tokenIndex = _allTokensIndex[tokenId];
    uint256 lastTokenIndex = _allTokens.length.sub(1);
    uint256 lastToken = _allTokens[lastTokenIndex];

    _allTokens[tokenIndex] = lastToken;
    _allTokens[lastTokenIndex] = 0;

    _allTokens.length--;
    _allTokensIndex[tokenId] = 0;
    _allTokensIndex[lastToken] = tokenIndex;
}
}

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address private _owner;

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

  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  constructor() public {
    _owner = msg.sender;
  }

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

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

  /**
   * @return true if `msg.sender` is the owner of the contract.
   */
  function isOwner() public view returns(bool) {
    return msg.sender == _owner;
  }

  /**
   * @dev Allows the current owner to relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  function renounceOwnership() public contract_onlyOwner {
    emit OwnershipRenounced(_owner);
    _owner = address(0);
  }

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public contract_onlyOwner {
    _transferOwnership(newOwner);
  }

  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address newOwner) internal {
    require(newOwner != address(0));
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }
}


/**
* @title Helper to allow various addresses to mint Chibis
* @dev Adds addresses to mapping that can be true/false queried
*/
contract MintWallets is Ownable {
    mapping (address => bool) internal _mintWallets;
    
    constructor () public {
        _mintWallets[msg.sender] = true;
    }
    
    /**
    * @dev Add a wallet/contract to the mint function functionality
    * @param _address The address/contract to allow minting 
    */
    function setMintAddress(address _address, bool _active) public contract_onlyOwner {
        _mintWallets[_address] = _active;
    }

    /**
    * @dev Check if wallet is true/false
    * @param _address The address/contract to check
    */
    function checkMintAllowed(address _address) public view returns (bool) {
        return _mintWallets[_address];
    }
    
    /**
    * @dev Throws if called by any account other than the owner.
    */
    modifier mintAllowed(address _address) {
        require(_mintWallets[_address]);
        _;
    }
}



/**
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension
* @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract IERC721Metadata is IERC721 {
function name() external view returns (string);
function symbol() external view returns (string);
function tokenURI(uint256 tokenId) public view returns (string);
}

contract ERC721Metadata is ERC165, ERC721, IERC721Metadata, MintWallets {
// Token name
string internal _name;

// Token symbol
string internal _symbol;

string infoUrlPrefix;


bytes4 private constant InterfaceId_ERC721Metadata = 0x5b5e139f;
/**
* 0x5b5e139f ===
*   bytes4(keccak256('name()')) ^
*   bytes4(keccak256('symbol()')) ^
*   bytes4(keccak256('tokenURI(uint256)'))
*/

/**
* @dev Constructor function
*/
constructor(string name, string symbol) public {
    _name = name;
    _symbol = symbol;

    // register the supported interfaces to conform to ERC721 via ERC165
    _registerInterface(InterfaceId_ERC721Metadata);
}

/**
* @dev Gets the token name
* @return string representing the token name
*/
function name() external view returns (string) {
    return _name;
}

/**
* @dev Gets the token symbol
* @return string representing the token symbol
*/
function symbol() external view returns (string) {
    return _symbol;
}

/**
* @dev Returns an URI for a given token ID
* Throws if the token ID does not exist. May return an empty string.
* @param tokenId uint256 ID of the token to query
*/
function tokenURI(uint256 tokenId) public view returns (string) {
    require(_exists(tokenId));
    string memory uri = strConcat(infoUrlPrefix, uint2str(tokenId));
    return uri;
}


/**
* @dev Internal function to burn a specific token
* Reverts if the token does not exist
* @param owner owner of the token to burn
* @param tokenId uint256 ID of the token being burned by the msg.sender
*/
function _burn(address owner, uint256 tokenId) internal {
    super._burn(owner, tokenId);
}

    // set info url for weapons
    function setInfoUrl(string _url) public contract_onlyOwner returns(bool success) {
        infoUrlPrefix = _url;
        return true;
    }
    

    /**
     * 
     * Helper stuff
     * 
     **/
     
    function stringToBytes32(string memory source) internal pure returns (bytes32 result) {
        bytes memory tempEmptyStringTest = bytes(source);
        if (tempEmptyStringTest.length == 0) {
            return 0x0;
        }
    
        assembly {
            result := mload(add(source, 32))
        }
    }
    
    function strConcat(string _a, string _b) internal pure returns (string) {
        return strConcatDoIt(_a, _b, "", "", "");
    }
    
    function strConcatDoIt(string _a, string _b, string _c, string _d, string _e) internal pure returns (string) {
        bytes memory _ba = bytes(_a);
        bytes memory _bb = bytes(_b);
        bytes memory _bc = bytes(_c);
        bytes memory _bd = bytes(_d);
        bytes memory _be = bytes(_e);
        string memory abcde = new string(_ba.length + _bb.length + _bc.length + _bd.length + _be.length);
        bytes memory babcde = bytes(abcde);
        uint k = 0;
        for (uint i = 0; i < _ba.length; i++) babcde[k++] = _ba[i];
        for (i = 0; i < _bb.length; i++) babcde[k++] = _bb[i];
        for (i = 0; i < _bc.length; i++) babcde[k++] = _bc[i];
        for (i = 0; i < _bd.length; i++) babcde[k++] = _bd[i];
        for (i = 0; i < _be.length; i++) babcde[k++] = _be[i];
        return string(babcde);
    }
    
    function uint2str(uint i) internal pure returns (string){
        if (i == 0) return "0";
        uint j = i;
        uint len;
        while (j != 0){
            len++;
            j /= 10;
        }
        bytes memory bstr = new bytes(len);
        uint k = len - 1;
        while (i != 0){
            bstr[k--] = byte(48 + i % 10);
            i /= 10;
        }
        return string(bstr);
    }

    function bytesToUint(bytes b) internal pure returns (uint256) {
      require(b.length == 32);

      bytes32 out;

      for (uint i = 0; i < 32; i++) {
        out |= bytes32(b[i] & 0xFF) >> (i * 8);
      }

      return uint256(out);
    }
    
    
}

/**
* @title Full ERC721 Token
* This implementation includes all the required and some optional functionality of the ERC721 standard
* Moreover, it includes approve all functionality using operator terminology
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721Full is ERC721, ERC721Enumerable, ERC721Metadata {
    
    string name = 'weapons';
    string symbol = 'CBW';
        
    constructor() ERC721Metadata(name, symbol)
        public
    {
        
    }
}


interface ERC20InterfaceClassic {
    function transfer(address to, uint tokens) external returns (bool success);
}

interface ERC20Interface {
    function transferFrom(address from, address to, uint tokens) external returns (bool success);
    function transfer(address to, uint tokens) external;
    function balanceOf(address _owner) external view returns (uint256 _balance);
}



contract Referral is Ownable {
    
    uint refIdCounter;
    uint refCutPerc;
    
    mapping (address => uint) refId;
    mapping (uint => address) refIdAddress;
    mapping (uint => uint) refCut;
    
    event RefPaid(uint refId, address indexed refOwner, uint amount);
    event RefCreated(uint refId, address indexed wallet);

    constructor () public {
        refIdCounter = 0;
        refCutPerc = 12;
    }
    
    // creates a new refid if address has none
    function createRefId() public {
        require(refId[msg.sender] == 0);
        
        refIdCounter++;
        refId[msg.sender] = refIdCounter;
        refIdAddress[refIdCounter] = msg.sender;
        refCut[refIdCounter] = refCutPerc;
        
        emit RefCreated(refIdCounter, msg.sender);
    }
    
    // used to set cut per referrer
    function setRefCut(uint _refId, uint _cut) public contract_onlyOwner {
        refCut[_refId] = _cut;
    }
    
    // user can query his own ref data, not that of others
    function queryRefId() public view returns(uint _refId, uint _refCut, address _address) {
        uint _id = refId[msg.sender];
        return (_id, refCut[_id], refIdAddress[_id]);
    }
    

}


// new and old chibi contract
contract ChibiInterface {
    function queryChibiDNA(uint) public pure returns (
        uint16[13]
        ) {}

    function ownerOf(uint256) public pure returns (address) {}
    
    // legacy support old chibi contract
    function queryChibi(uint) public pure returns (
        string,
        string,
        uint16[13],
        uint256,
        uint256,
        uint,
        uint
        ) {}
    
}


contract WeaponGenesInterface {
    function generateData(uint _tokenId) public view returns (uint, uint);
    function generateRareMythicData(uint _tokenId) public view returns (uint);
    function generateLegendaryData(uint _tokenId) public view returns (uint);
}


/**
 *  Weapons for Chibis
 *  
 */
contract Weapons is ERC721Full, Referral {
    
    // couple events
    event WeaponClaimed(address indexed from, uint chibiId, uint weaponTokenId, uint weaponRarity, uint weaponType);
    event WeaponSaleBought(address indexed from, address indexed to, uint weaponTokenId, uint weaponPricePlayer, uint weaponPrice);
    event WeaponBought(address indexed from, uint weaponTokenId, uint weaponRarity, uint weaponType);
    event WeaponMintedToAddr(address indexed from, uint weaponTokenId, uint weaponRarity, uint weaponType, string weaponCode);
    event WeaponForSale(address indexed from, uint weaponTokenId, uint weaponPrice);
    event WeaponSaleCancelled(address indexed from, uint weaponTokenId);

    uint uniqueCounter;

    ChibiInterface chibiContract;

    WeaponGenesInterface genesContract;

    // default weapon price
    uint _weaponPrice;
    uint _rareWeaponPrice;
    uint _mythicWeaponPrice;
    uint _legendaryWeaponPrice;
    
    // sell weapon internally
    mapping(uint256 => uint256) private _weaponSalePrice;
    
    // mapping for Chibi to claim weapon
    mapping(uint256 => bool) private _weaponClaimed;
    
    // our comission
    uint comission;
    
    // for players putting weapons up, to avoid super low prices from botters
    uint minPrice;
    
    struct WeaponsData {
        uint rarity;
        uint weaponType;
    }
    
    bool public gameState;
    bool public gameStateClaim;
    
    mapping(uint256 => WeaponsData) private weapons;
    
    constructor () public {
        
        // min price people can put up weapons
        minPrice = 100;
        
        _weaponPrice = 100;
        _rareWeaponPrice = 200;
        _mythicWeaponPrice = 300;
        _legendaryWeaponPrice = 400;

        uniqueCounter = 0;
        infoUrlPrefix = "https://chibifighters.io/api/weapon.php?id=";

        // set comission percentage inverted
        comission = 80;
        
        gameState = true;
        gameStateClaim = true;
        
    }
    
    // returns min price for weapon sale to avoid cheap sales
    function queryMinPrice() public view returns (uint price) {
        return minPrice;
    }

    	
	function queryDefaultSalePrice(uint rarity) public view returns (uint price) {
		if (rarity == 0) {
			return _weaponPrice;
		}else
		if (rarity == 1) {
			return _rareWeaponPrice;
		}else
		if (rarity == 2) {
			return _mythicWeaponPrice;
		}else
		if (rarity == 3) {
			return _legendaryWeaponPrice;
		}
		return 0;
	}

	// returns min price for weapon sale to avoid cheap sales
	function setMinPrice(uint _minPrice) public contract_onlyOwner returns (uint price) {
		minPrice = _minPrice;
		return minPrice;
	}

	// returns min price for weapon sale to avoid cheap sales
	function setGameState(bool _paused) public contract_onlyOwner returns (bool paused) {
		gameState = _paused;
		return gameState;
	}
	
	// returns min price for weapon sale to avoid cheap sales
	function setGameStateClaim(bool _paused) public contract_onlyOwner returns (bool paused) {
		gameStateClaim = _paused;
		return gameState;
	}
	
	function queryWeaponData(uint _tokenId) public view returns (uint tokenId, address owner, uint rarity, uint weaponType) {
		return (
			_tokenId,
			ownerOf(_tokenId),
			weapons[_tokenId].rarity,
			weapons[_tokenId].weaponType
			);
	}

	
	// check if chibi already claimed weapon
	function queryChibiClaimed(uint chibiId) public view returns (bool success) {
		return _weaponClaimed[chibiId];
	}
	

	function setCommission(uint percent) public contract_onlyOwner returns(bool success) {
		comission = 100 - percent;
		return true;
	}
	
	
	function getCommission() public view contract_onlyOwner returns(uint _comission) {
		return 100 - comission;
	}


	function putWeaponForSale(uint tokenId, uint price) public notPaused returns (bool success) {
		require (msg.sender == ownerOf(tokenId));
		require (price >= minPrice);

		_weaponSalePrice[tokenId] = price;
		approve(this, tokenId);

		emit WeaponForSale(msg.sender, tokenId, price);
		return true;
	}
	
	
	function cancelWeaponSale(uint tokenId) public returns (bool success) {
		require (msg.sender == ownerOf(tokenId));
		_weaponSalePrice[tokenId] = 0;
		
		// remove approval from contract
		_clearApproval(msg.sender, tokenId);

		emit WeaponSaleCancelled(msg.sender, tokenId);
		return true;
	}
	
	
	function buySaleWeapon(uint tokenId) public payable notPaused returns (bool success) {
		require(msg.sender != ownerOf(tokenId));
		require(_weaponSalePrice[tokenId] > 0);
		require(msg.value == _weaponSalePrice[tokenId]);
		require(_isApprovedOrOwner(this, tokenId));
		
		address _to = msg.sender;
		require(_to != address(0));
		
		_weaponSalePrice[tokenId] = 0;
		address _from = ownerOf(tokenId);
		
		uint finalPrice = msg.value / 100 * comission;
		
		// transfer weapon
		_removeTokenFrom(_from, tokenId);
		_addTokenTo(_to, tokenId);
		_clearApproval(msg.sender, tokenId);
	
		emit Transfer(_from, _to, tokenId);

		// transfer ether
		_from.transfer(finalPrice);
			
		emit WeaponSaleBought(_from, _to, tokenId, finalPrice, msg.value);
		return true;
	}
	

	// price for default weapons
	function setWeaponPrice(uint mode, uint _setWeaponPrice) public contract_onlyOwner returns(bool success, uint weaponPrice) {
		if (mode == 0) {
			_weaponPrice = _setWeaponPrice;
		}else
		if (mode == 1) {
			_rareWeaponPrice = _setWeaponPrice;
		}else
		if (mode == 2) {
			_mythicWeaponPrice = _setWeaponPrice;
		}else
		if (mode == 3) {
			_legendaryWeaponPrice = _setWeaponPrice;
		}
		
		return (true, _setWeaponPrice);
	}
	

	// set chibi contract
	function setChibiAddress(address _address) public contract_onlyOwner returns (bool success) {
		chibiContract = ChibiInterface(_address);
		return true;
	}
	
	
	// set genes contract
	function setGenesAddress(address _address) public contract_onlyOwner returns (bool success) {
		genesContract = WeaponGenesInterface(_address);
		return true;
	}
	
	
	// get dna to claim weapons (only way to get founder weapons)
	function getChibiWeaponDna(uint _chibiId) internal view returns (uint weapon, uint rarity) {
		uint16[13] memory _dna = chibiContract.queryChibiDNA(_chibiId);
		
		return (_dna[7], _dna[8]);
	}
	

	// buy a random weapon, can be anything from common to legendary
	function buyWeapon(uint amount, uint _refId) public payable notPaused {
		require(_weaponPrice.mul(amount) == msg.value);
		// founder weapons can not be bought, and nothing that doesn't exist yet

		for (uint i=0;i<amount;i++) {
			uniqueCounter++;
			require(!_exists(uniqueCounter));
			
			// mint also triggers transfer event
			_mint(address(msg.sender), uniqueCounter);
			
			(uint _weaponRarity, uint _weaponType) = genesContract.generateData(uniqueCounter);
			weapons[uniqueCounter].rarity = _weaponRarity;
			weapons[uniqueCounter].weaponType = _weaponType;
			
			emit WeaponBought(msg.sender, uniqueCounter, _weaponRarity, _weaponType);
		}
		
		if (refIdAddress[_refId] != address(0) && msg.sender != refIdAddress[_refId]) {
		    uint amountRef = msg.value.mul(refCut[_refId]).div(100);
		    refIdAddress[_refId].transfer(amountRef);
		    emit RefPaid(_refId, refIdAddress[_refId], amountRef);
		}
	}
	
	
	
	// buy a guaranteed rare weapon
	function buyWeaponRare(uint amount, uint _refId) public payable notPaused {
		require(_rareWeaponPrice.mul(amount) == msg.value);
		// founder weapons can not be bought, and nothing that doesn't exist yet

		for (uint i=0;i<amount;i++) {
			uniqueCounter++;
			require(!_exists(uniqueCounter));
			
			// mint also triggers transfer event
			_mint(address(msg.sender), uniqueCounter);
			
			uint _weaponType = genesContract.generateRareMythicData(uniqueCounter);
			weapons[uniqueCounter].rarity = 1;
			weapons[uniqueCounter].weaponType = _weaponType;

			emit WeaponBought(msg.sender, uniqueCounter, 1, _weaponType);
		}
		
		if (refIdAddress[_refId] != address(0) && msg.sender != refIdAddress[_refId]) {
		    uint amountRef = msg.value.mul(refCut[_refId]).div(100);
		    refIdAddress[_refId].transfer(amountRef);
		    emit RefPaid(_refId, refIdAddress[_refId], amountRef);
		}
	}
	
	
	// buy a guaranteed mythic weapon
	function buyWeaponMythic(uint amount, uint _refId) public payable notPaused {
		require(_mythicWeaponPrice.mul(amount) == msg.value);

		for (uint i=0;i<amount;i++) {
			uniqueCounter++;
			require(!_exists(uniqueCounter));
			
			// mint also triggers transfer event
			_mint(address(msg.sender), uniqueCounter);
			
			uint _weaponType = genesContract.generateRareMythicData(uniqueCounter);
			weapons[uniqueCounter].rarity = 2;
			weapons[uniqueCounter].weaponType = _weaponType;

			emit WeaponBought(msg.sender, uniqueCounter, 2, _weaponType);
		}
		
		if (refIdAddress[_refId] != address(0) && msg.sender != refIdAddress[_refId]) {
		    uint amountRef = msg.value.mul(refCut[_refId]).div(100);
		    refIdAddress[_refId].transfer(amountRef);
		    emit RefPaid(_refId, refIdAddress[_refId], amountRef);
		}
	}
	
	
	// buy a guaranteed legendary weapon
	function buyWeaponLegendary(uint amount, uint _refId) public payable notPaused {
		require(_legendaryWeaponPrice.mul(amount) == msg.value);

		for (uint i=0;i<amount;i++) {
			uniqueCounter++;
			require(!_exists(uniqueCounter));
			
			// mint also triggers transfer event
			_mint(address(msg.sender), uniqueCounter);
			
			uint _weaponType = genesContract.generateLegendaryData(uniqueCounter);
			weapons[uniqueCounter].rarity = 3;
			weapons[uniqueCounter].weaponType = _weaponType;

			emit WeaponBought(msg.sender, uniqueCounter, 3, _weaponType);
		}
		
		if (refIdAddress[_refId] != address(0) && msg.sender != refIdAddress[_refId]) {
		    uint amountRef = msg.value.mul(refCut[_refId]).div(100);
		    refIdAddress[_refId].transfer(amountRef);
		    emit RefPaid(_refId, refIdAddress[_refId], amountRef);
		}
	}

	// mint weapon as result of voucher purchase or what not
	// code is used to identify weapon and apply required stats
	function mintWeaponToAddr(uint _weaponRarity, uint _weaponType, address _receiver, string _code) public mintAllowed(msg.sender) {

        if (_weaponType < 10 || (_weaponType>=8000 && _weaponType<=8013)) revert();
        
		uniqueCounter++;
		require(!_exists(uniqueCounter));

		// mint also triggers transfer event
		_mint(address(_receiver), uniqueCounter);
		
		weapons[uniqueCounter].rarity = _weaponRarity;
		weapons[uniqueCounter].weaponType = _weaponType;
		
		emit WeaponMintedToAddr(_receiver, uniqueCounter, _weaponRarity, _weaponType, _code);

	}
	
	
	// Chibis can claim their initial weapon
	// that is also the only way to get a founder weapon
	//
	function claimWeapon(uint _chibiId) public claimNotPaused {
		require(chibiContract.ownerOf(_chibiId) == msg.sender);
		require(_weaponClaimed[_chibiId] == false);
		
		uniqueCounter++;
		
		// mark claimed
		_weaponClaimed[_chibiId] = true;
		
		// get weapon dna of chibi
		(uint _weaponType, uint _chibiRarity) = getChibiWeaponDna(_chibiId);
		
		_mint(address(msg.sender), uniqueCounter);
		
		weapons[uniqueCounter].weaponType = _weaponType;

		if (_weaponType < 10 || _weaponType > 7999) {
			weapons[uniqueCounter].rarity = 3;
		} else {
			// rarity comes from chibi when claimed, however legendary chibis still get just a mythic weapon since legendary weapons are either bought or made with a fragment
			if (_chibiRarity == 3) weapons[uniqueCounter].rarity = 2;
				else weapons[uniqueCounter].rarity = _chibiRarity;
		}

		emit WeaponClaimed(msg.sender, _chibiId, uniqueCounter, weapons[uniqueCounter].rarity, weapons[uniqueCounter].weaponType);
		
	}
	
	// old chibi contract
	function claimWeaponOld(uint _chibiId) public notPaused {
		require(chibiContract.ownerOf(_chibiId) == msg.sender);
		require(_weaponClaimed[_chibiId] == false);
		
		uniqueCounter++;
		
		// mark claimed
		_weaponClaimed[_chibiId] = true;
		
		// get weapon dna of chibi
		uint16[13] memory _dna;
		(
		,
		,
		_dna,
		,
		,
		,
		
		) = chibiContract.queryChibi(_chibiId);
		
		uint _weaponType = _dna[7];
		uint _chibiRarity = _dna[8];

		_mint(address(msg.sender), uniqueCounter);
		
		weapons[uniqueCounter].weaponType = _weaponType;

		if (_weaponType < 10 || _weaponType > 7999) {
			weapons[uniqueCounter].rarity = 3;
		}else {
			// rarity comes from chibi when claimed, however legendary chibis still get just a mythic weapon since legendary weapons are either bought or made with a fragment
			if (_chibiRarity == 3) weapons[uniqueCounter].rarity = 2;
				else weapons[uniqueCounter].rarity = _chibiRarity;
		}

		emit WeaponClaimed(msg.sender, _chibiId, uniqueCounter, weapons[uniqueCounter].rarity, weapons[uniqueCounter].weaponType);
		
	}


	function queryForSale(uint _tokenId) public view returns (uint price, address owner) {
		require(_isApprovedOrOwner(this, _tokenId));
		
		return (
			_weaponSalePrice[_tokenId],
			ownerOf(_tokenId)
		);
	}

	
	/**
	* @dev Send Ether to owner
	* @param _address Receiving address
	* @param _amountWei Amount in WEI to send
	**/
	function weiToOwner(address _address, uint _amountWei) public contract_onlyOwner returns (bool success) {
		require(_amountWei <= address(this).balance);
		_address.transfer(_amountWei);
		return true;
	}
	
	function ERC20ToOwner(address _to, uint256 _amount, ERC20Interface _tokenContract) public contract_onlyOwner {
		_tokenContract.transfer(_to, _amount);
	}

	function ERC20ClassicToOwner(address _to, uint256 _amount, ERC20InterfaceClassic _tokenContract) public contract_onlyOwner {
		_tokenContract.transfer(_to, _amount);
	}
	
	function queryERC20(ERC20Interface _tokenContract) public view contract_onlyOwner returns (uint) {
		return _tokenContract.balanceOf(this);
	}


	modifier notPaused() {
		require(gameState == false);
		_;
	}
	
	modifier claimNotPaused() {
		require(gameStateClaim == false);
		_;
	}
	
}