// File: contracts/Traits.sol



// SPDX-License-Identifier: MIT LICENSE

pragma solidity ^0.8.0;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "./interfaces/ITraits.sol";
import "./interfaces/IHND.sol";

contract Traits is Ownable, ITraits {

  using Strings for uint256;

  // struct to store each trait's data for metadata and rendering
  struct Trait {
    string name;
    string png;
  }

  // mapping from trait type (index) to its name
  string[10] private _traitTypes = [
    "Body",
    "Eyes",
    "Face",
    "Headpiece",
    "Tail",
    "Armor",
    "Gloves",
    "Weapon",
    "Shoes",
    "Shield"
  ];
  // storage of each traits name and base64 PNG data
  mapping(uint8 => mapping(uint8 => Trait)) public traitData;
  // mapping from rankIndex to its score
  string[4] private _ranks = [
    "8",
    "7",
    "6",
    "5"
  ];

  IHND public hndNFT;

  constructor() {}

  /** ADMIN */

  function setHND(address _hndNFT) external onlyOwner {
    hndNFT = IHND(_hndNFT);
  }

  function uploadTraits(uint8 traitType, uint8[] calldata traitIds, string[] calldata traitNames, string[] calldata traitPngs) external onlyOwner {
    require(traitIds.length == traitNames.length, "Mismatched inputs");
    for (uint i = 0; i < traitIds.length; i++) {
      traitData[traitType][traitIds[i]] = Trait(
        traitNames[i],
        traitPngs[i]
      );
    }
  }

  /** RENDER */

  /**
   * generates an <image> element using base64 encoded PNGs
   * @param trait the trait storing the PNG data
   * @return the <image> element
   */
  function drawTrait(Trait memory trait) internal pure returns (string memory) {
    return string(abi.encodePacked(
      '<image x="4" y="4" width="32" height="32" image-rendering="pixelated" preserveAspectRatio="xMidYMid" xlink:href="data:image/png;base64,',
      trait.png,
      '"/>'
    ));
  }

  /**
   * generates an entire SVG by composing multiple <image> elements of PNGs
   * @param tokenId the ID of the token to generate an SVG for
   * @return a valid SVG of the Hero / Demon
   */
  function drawSVG(uint256 tokenId) internal view returns (string memory) {
    IHND.HeroDemon memory s = hndNFT.getTokenTraits(tokenId);


    // t.isFemale is cast as 0/1 for false/true
    uint8 isFemale;
    if (s.isFemale) {
        isFemale = 1;
    } 

    string memory svgString;

    if (s.isHero) {   
      svgString = string(abi.encodePacked(
       drawTrait(traitData[0][s.body]),
       drawTrait(traitData[1 + isFemale][s.face]),
       drawTrait(traitData[3 + isFemale][s.headpiecehorns]),
       drawTrait(traitData[5 + isFemale][s.armor]),
       drawTrait(traitData[7][s.gloves]),
       drawTrait(traitData[8][s.shoes]),
       drawTrait(traitData[10][s.shield]),
       drawTrait(traitData[9][s.weapon])
       
      ));
            
    } else {
       svgString = string(abi.encodePacked(
        drawTrait(traitData[11][s.body]),
        drawTrait(traitData[12][s.eyes]),
        drawTrait(traitData[13][s.headpiecehorns]),
        drawTrait(traitData[14][s.tailflame]),
        drawTrait(traitData[15][s.armor]),
        drawTrait(traitData[16][s.weapon])
      ));
            
    }

    return string(abi.encodePacked(
      '<svg id="hndNFT" width="100%" height="100%" version="1.1" viewBox="0 0 40 40" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">',
      svgString,
      "</svg>"
    ));
  }

  /**
   * generates an attribute for the attributes array in the ERC721 metadata standard
   * @param traitType the trait type to reference as the metadata key
   * @param value the token's trait associated with the key
   * @return a JSON dictionary for the single attribute
   */
  function attributeForTypeAndValue(string memory traitType, string memory value) internal pure returns (string memory) {
    return string(abi.encodePacked(
      '{"trait_type":"',
      traitType,
      '","value":"',
      value,
      '"}'
    ));
  }

  /**
   * generates an array composed of all the individual traits and values
   * @param tokenId the ID of the token to compose the metadata for
   * @return a JSON array of all of the attributes for given token ID
   */
  function compileAttributes(uint256 tokenId) internal view returns (string memory) {
    IHND.HeroDemon memory s = hndNFT.getTokenTraits(tokenId);
    string memory traits;

    uint8 isFemale;
    if (s.isFemale) {
        isFemale = 1;
    } 

    if (s.isHero) {
                
      traits = string(abi.encodePacked(
        attributeForTypeAndValue(_traitTypes[0], traitData[0][s.body].name),',',
        attributeForTypeAndValue(_traitTypes[1 + isFemale], traitData[1 + isFemale][s.face].name),',',
        attributeForTypeAndValue(_traitTypes[3 + isFemale], traitData[3 + isFemale][s.headpiecehorns].name),',',
        attributeForTypeAndValue(_traitTypes[5 + isFemale], traitData[5 + isFemale][s.armor].name),',',
        attributeForTypeAndValue(_traitTypes[6], traitData[7][s.gloves].name),',',
        attributeForTypeAndValue(_traitTypes[8], traitData[8][s.shoes].name),',',
        attributeForTypeAndValue(_traitTypes[9], traitData[10][s.shield].name),',',
        attributeForTypeAndValue(_traitTypes[7], traitData[9][s.weapon].name),','
      ));

    } else {

      traits = string(abi.encodePacked(
        attributeForTypeAndValue(_traitTypes[0], traitData[11][s.body].name),',',
        attributeForTypeAndValue(_traitTypes[1], traitData[12][s.eyes].name),',',
        attributeForTypeAndValue(_traitTypes[3], traitData[13][s.headpiecehorns].name),',',
        attributeForTypeAndValue(_traitTypes[4], traitData[14][s.tailflame].name),',',
        attributeForTypeAndValue(_traitTypes[8], traitData[15][s.armor].name),',',
        attributeForTypeAndValue(_traitTypes[7], traitData[16][s.weapon].name),',',
        attributeForTypeAndValue("Rank Score", _ranks[s.rankIndex]),','
      ));
    }
    return string(abi.encodePacked(
      '[',
      traits,
      '{"trait_type":"Generation","value":',
      tokenId <= hndNFT.getPaidTokens() ? '"Gen 0"' : '"Gen 1"',
      '},{"trait_type":"Type","value":',
      s.isHero ? '"Hero"' : '"Demon"',
      '}]'
    ));
  }

  /**
   * generates a base64 encoded metadata response without referencing off-chain content
   * @param tokenId the ID of the token to generate the metadata for
   * @return a base64 encoded JSON dictionary of the token's metadata and SVG
   */
  function tokenURI(uint256 tokenId) public view override returns (string memory) {
    require(_msgSender() == address(hndNFT), "hmmmm what doing?");
    IHND.HeroDemon memory s = hndNFT.getTokenTraits(tokenId);

    string memory metadata = string(abi.encodePacked(
      '{"name": "',
      s.isHero ? 'Hero #' : 'Demon #',
      tokenId.toString(),
      '", "description": "A Great War Has Broken Out In The Kingdom Of Fantasia. Play As Heroes And Demons In The War. Earn Experience In The Form Of $EXP Tokens In Battle. Spend $EXP In-Game. All the metadata and images are generated and stored 100% on-chain. No IPFS. NO API. Just the Ethereum blockchain.", "image": "data:image/svg+xml;base64,',
      base64(bytes(drawSVG(tokenId))),
      '", "attributes":',
      compileAttributes(tokenId),
      "}"
    ));

    return string(abi.encodePacked(
      "data:application/json;base64,",
      base64(bytes(metadata))
    ));
  }

  /** BASE 64 - Written by Brech Devos */
  
  string internal constant TABLE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';

  function base64(bytes memory data) internal pure returns (string memory) {
    if (data.length == 0) return '';
    
    // load the table into memory
    string memory table = TABLE;

    // multiply by 4/3 rounded up
    uint256 encodedLen = 4 * ((data.length + 2) / 3);

    // add some extra buffer at the end required for the writing
    string memory result = new string(encodedLen + 32);

    assembly {
      // set the actual output length
      mstore(result, encodedLen)
      
      // prepare the lookup table
      let tablePtr := add(table, 1)
      
      // input ptr
      let dataPtr := data
      let endPtr := add(dataPtr, mload(data))
      
      // result ptr, jump over length
      let resultPtr := add(result, 32)
      
      // run over the input, 3 bytes at a time
      for {} lt(dataPtr, endPtr) {}
      {
          dataPtr := add(dataPtr, 3)
          
          // read 3 bytes
          let input := mload(dataPtr)
          
          // write 4 characters
          mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr(18, input), 0x3F)))))
          resultPtr := add(resultPtr, 1)
          mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr(12, input), 0x3F)))))
          resultPtr := add(resultPtr, 1)
          mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr( 6, input), 0x3F)))))
          resultPtr := add(resultPtr, 1)
          mstore(resultPtr, shl(248, mload(add(tablePtr, and(        input,  0x3F)))))
          resultPtr := add(resultPtr, 1)
      }
      
      // padding with '='
      switch mod(mload(data), 3)
      case 1 { mstore(sub(resultPtr, 2), shl(240, 0x3d3d)) }
      case 2 { mstore(sub(resultPtr, 1), shl(248, 0x3d)) }
    }
    
    return result;
  }
}
// File: contracts/interfaces/IHND.sol



// SPDX-License-Identifier: MIT LICENSE

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";

interface IHND is IERC721Enumerable {

    // game data storage
    struct HeroDemon {
        bool isHero;
        bool isFemale;
        uint8 body;
        uint8 face;
        uint8 eyes;
        uint8 headpiecehorns;
        uint8 gloves;
        uint8 armor;
        uint8 weapon;
        uint8 shield;
        uint8 shoes;
        uint8 tailflame;
        uint8 rankIndex;
    }

    function minted() external returns (uint16);
    function updateOriginAccess(uint16[] memory tokenIds) external;
    function mint(address recipient, uint256 seed) external;
    function burn(uint256 tokenId) external;
    function getMaxTokens() external view returns (uint256);
    function getPaidTokens() external view returns (uint256);
    function getTokenTraits(uint256 tokenId) external view returns (HeroDemon memory);
    function getTokenWriteBlock(uint256 tokenId) external view returns(uint64);
    function isHero(uint256 tokenId) external view returns(bool);
  
}
// File: contracts/interfaces/ITraits.sol



// SPDX-License-Identifier: MIT LICENSE 

pragma solidity ^0.8.0;

interface ITraits {
  function tokenURI(uint256 tokenId) external view returns (string memory);
}
// File: @openzeppelin/contracts/utils/Strings.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

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

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

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

    /**
     * @dev 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 {
        _transferOwnership(address(0));
    }

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

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

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}