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// SPDX-License-Identifier: MIT

// Proton.sol -- Part of the Charged Particles Protocol
// Copyright (c) 2021 Firma Lux, Inc. <https://charged.fi>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import "../lib/ERC721.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

import "../interfaces/IProton.sol";
import "../interfaces/IUniverse.sol";
import "../interfaces/IChargedState.sol";
import "../interfaces/IChargedSettings.sol";
import "../interfaces/IChargedParticles.sol";

import "../lib/BlackholePrevention.sol";
import "../lib/RelayRecipient.sol";


contract Proton is IProton, ERC721, Ownable, RelayRecipient, ReentrancyGuard, BlackholePrevention {
  using SafeMath for uint256;
  using Address for address payable;
  using Counters for Counters.Counter;

  uint256 constant internal PERCENTAGE_SCALE = 1e4;   // 10000  (100%)
  uint256 constant internal MAX_ROYALTIES = 8e3;      // 8000   (80%)

  IUniverse internal _universe;
  IChargedState internal _chargedState;
  IChargedSettings internal _chargedSettings;
  IChargedParticles internal _chargedParticles;

  Counters.Counter internal _tokenIds;

  mapping (uint256 => address) internal _tokenCreator;
  mapping (uint256 => uint256) internal _tokenCreatorRoyaltiesPct;
  mapping (uint256 => address) internal _tokenCreatorRoyaltiesRedirect;
  mapping (address => uint256) internal _tokenCreatorClaimableRoyalties;

  mapping (uint256 => uint256) internal _tokenSalePrice;
  mapping (uint256 => uint256) internal _tokenLastSellPrice;

  bool internal _paused;


  /***********************************|
  |          Initialization           |
  |__________________________________*/

  constructor() public ERC721("Charged Particles - Proton", "PROTON") {}


  /***********************************|
  |              Public               |
  |__________________________________*/

  function creatorOf(uint256 tokenId) external view virtual override returns (address) {
    return _tokenCreator[tokenId];
  }

  function getSalePrice(uint256 tokenId) external view virtual override returns (uint256) {
    return _tokenSalePrice[tokenId];
  }

  function getLastSellPrice(uint256 tokenId) external view virtual override returns (uint256) {
    return _tokenLastSellPrice[tokenId];
  }

  function getCreatorRoyalties(address account) external view virtual override returns (uint256) {
    return _tokenCreatorClaimableRoyalties[account];
  }

  function getCreatorRoyaltiesPct(uint256 tokenId) external view virtual override returns (uint256) {
    return _tokenCreatorRoyaltiesPct[tokenId];
  }

  function getCreatorRoyaltiesReceiver(uint256 tokenId) external view virtual override returns (address) {
    return _creatorRoyaltiesReceiver(tokenId);
  }

  function claimCreatorRoyalties()
    external
    virtual
    override
    nonReentrant
    whenNotPaused
    returns (uint256)
  {
    return _claimCreatorRoyalties(_msgSender());
  }

  function createChargedParticle(
    address creator,
    address receiver,
    address referrer,
    string memory tokenMetaUri,
    string memory walletManagerId,
    address assetToken,
    uint256 assetAmount,
    uint256 annuityPercent
  )
    external
    virtual
    override
    nonReentrant
    whenNotPaused
    returns (uint256 newTokenId)
  {
    newTokenId = _createChargedParticle(
      creator,
      receiver,
      referrer,
      tokenMetaUri,
      walletManagerId,
      assetToken,
      assetAmount,
      annuityPercent
    );
  }

  function createBasicProton(
    address creator,
    address receiver,
    string memory tokenMetaUri
  )
    external
    virtual
    override
    whenNotPaused
    returns (uint256 newTokenId)
  {
    newTokenId = _createProton(
      creator,
      receiver,
      tokenMetaUri,
      0, // annuityPercent,
      0, // royaltiesPercent
      0  // salePrice
    );
  }

  function createProton(
    address creator,
    address receiver,
    string memory tokenMetaUri,
    uint256 annuityPercent
  )
    external
    virtual
    override
    whenNotPaused
    returns (uint256 newTokenId)
  {
    newTokenId = _createProton(
      creator,
      receiver,
      tokenMetaUri,
      annuityPercent,
      0, // royaltiesPercent
      0  // salePrice
    );
  }

  function createProtonForSale(
    address creator,
    address receiver,
    string memory tokenMetaUri,
    uint256 annuityPercent,
    uint256 royaltiesPercent,
    uint256 salePrice
  )
    external
    virtual
    override
    whenNotPaused
    returns (uint256 newTokenId)
  {
    newTokenId = _createProton(
      creator,
      receiver,
      tokenMetaUri,
      annuityPercent,
      royaltiesPercent,
      salePrice
    );
  }

  function batchProtonsForSale(
    address creator,
    uint256 annuityPercent,
    uint256 royaltiesPercent,
    string[] calldata tokenMetaUris,
    uint256[] calldata salePrices
  )
    external
    virtual
    override
    whenNotPaused
  {
    _batchProtonsForSale(
      creator,
      annuityPercent,
      royaltiesPercent,
      tokenMetaUris,
      salePrices
    );
  }

  function buyProton(uint256 tokenId)
    external
    payable
    virtual
    override
    nonReentrant
    whenNotPaused
    returns (bool)
  {
    return _buyProton(tokenId);
  }

  /***********************************|
  |     Only Token Creator/Owner      |
  |__________________________________*/

  function setSalePrice(uint256 tokenId, uint256 salePrice)
    external
    virtual
    override
    whenNotPaused
    onlyTokenOwnerOrApproved(tokenId)
  {
    _setSalePrice(tokenId, salePrice);
  }

  function setRoyaltiesPct(uint256 tokenId, uint256 royaltiesPct)
    external
    virtual
    override
    whenNotPaused
    onlyTokenCreator(tokenId)
    onlyTokenOwnerOrApproved(tokenId)
  {
    _setRoyaltiesPct(tokenId, royaltiesPct);
  }

  function setCreatorRoyaltiesReceiver(uint256 tokenId, address receiver)
    external
    virtual
    override
    whenNotPaused
    onlyTokenCreator(tokenId)
  {
    _tokenCreatorRoyaltiesRedirect[tokenId] = receiver;
  }


  /***********************************|
  |          Only Admin/DAO           |
  |__________________________________*/

  function setPausedState(bool state) external virtual onlyOwner {
    _paused = state;
    emit PausedStateSet(state);
  }

  /**
    * @dev Setup the ChargedParticles Interface
    */
  function setUniverse(address universe) external virtual onlyOwner {
    _universe = IUniverse(universe);
    emit UniverseSet(universe);
  }

  /**
    * @dev Setup the ChargedParticles Interface
    */
  function setChargedParticles(address chargedParticles) external virtual onlyOwner {
    _chargedParticles = IChargedParticles(chargedParticles);
    emit ChargedParticlesSet(chargedParticles);
  }

  /// @dev Setup the Charged-State Controller
  function setChargedState(address stateController) external virtual onlyOwner {
    _chargedState = IChargedState(stateController);
    emit ChargedStateSet(stateController);
  }

  /// @dev Setup the Charged-Settings Controller
  function setChargedSettings(address settings) external virtual onlyOwner {
    _chargedSettings = IChargedSettings(settings);
    emit ChargedSettingsSet(settings);
  }

  function setTrustedForwarder(address _trustedForwarder) external virtual onlyOwner {
    trustedForwarder = _trustedForwarder;
  }

  /***********************************|
  |          Only Admin/DAO           |
  |      (blackhole prevention)       |
  |__________________________________*/

  function withdrawEther(address payable receiver, uint256 amount) external onlyOwner {
    _withdrawEther(receiver, amount);
  }

  function withdrawErc20(address payable receiver, address tokenAddress, uint256 amount) external onlyOwner {
    _withdrawERC20(receiver, tokenAddress, amount);
  }

  function withdrawERC721(address payable receiver, address tokenAddress, uint256 tokenId) external onlyOwner {
    _withdrawERC721(receiver, tokenAddress, tokenId);
  }


  /***********************************|
  |         Private Functions         |
  |__________________________________*/

  function _setSalePrice(uint256 tokenId, uint256 salePrice) internal virtual {
    // Temp-Lock/Unlock NFT
    //  prevents front-running the sale and draining the value of the NFT just before sale
    _chargedState.setTemporaryLock(address(this), tokenId, (salePrice > 0));

    _tokenSalePrice[tokenId] = salePrice;
    emit SalePriceSet(tokenId, salePrice);
  }

  function _setRoyaltiesPct(uint256 tokenId, uint256 royaltiesPct) internal virtual {
    require(royaltiesPct <= MAX_ROYALTIES, "PRT:E-421");
    _tokenCreatorRoyaltiesPct[tokenId] = royaltiesPct;
    emit CreatorRoyaltiesSet(tokenId, royaltiesPct);
  }

  function _creatorRoyaltiesReceiver(uint256 tokenId) internal view virtual returns (address) {
    address receiver = _tokenCreatorRoyaltiesRedirect[tokenId];
    if (receiver == address(0x0)) {
      receiver = _tokenCreator[tokenId];
    }
    return receiver;
  }

  function _createChargedParticle(
    address creator,
    address receiver,
    address referrer,
    string memory tokenMetaUri,
    string memory walletManagerId,
    address assetToken,
    uint256 assetAmount,
    uint256 annuityPercent
  )
    internal
    virtual
    returns (uint256 newTokenId)
  {
    require(address(_chargedParticles) != address(0x0), "PRT:E-107");

    newTokenId = _createProton(creator, receiver, tokenMetaUri, annuityPercent, 0, 0);

    _chargeParticle(newTokenId, walletManagerId, assetToken, assetAmount, referrer);
  }

  function _createProton(
    address creator,
    address receiver,
    string memory tokenMetaUri,
    uint256 annuityPercent,
    uint256 royaltiesPercent,
    uint256 salePrice
  )
    internal
    virtual
    returns (uint256 newTokenId)
  {
    _tokenIds.increment();

    newTokenId = _tokenIds.current();
    _safeMint(receiver, newTokenId, "");
    _tokenCreator[newTokenId] = creator;

    _setTokenURI(newTokenId, tokenMetaUri);

    if (royaltiesPercent > 0) {
      _setRoyaltiesPct(newTokenId, royaltiesPercent);
    }

    if (salePrice > 0) {
      _setSalePrice(newTokenId, salePrice);
    }

    if (annuityPercent > 0) {
      _chargedSettings.setCreatorAnnuities(
        address(this),
        newTokenId,
        creator,
        annuityPercent
      );
    }
  }

  function _batchProtonsForSale(
    address creator,
    uint256 annuityPercent,
    uint256 royaltiesPercent,
    string[] calldata tokenMetaUris,
    uint256[] calldata salePrices
  )
    internal
    virtual
  {
    require(tokenMetaUris.length == salePrices.length, "PRT:E-202");
    address self = address(this);

    uint256 count = tokenMetaUris.length;
    for (uint256 i = 0; i < count; i++) {
      _tokenIds.increment();
      uint256 newTokenId = _tokenIds.current();

      _safeMint(creator, newTokenId, "");
      _tokenCreator[newTokenId] = creator;

      _setTokenURI(newTokenId, tokenMetaUris[i]);

      if (royaltiesPercent > 0) {
        _setRoyaltiesPct(newTokenId, royaltiesPercent);
      }

      uint256 salePrice = salePrices[i];
      if (salePrice > 0) {
        _setSalePrice(newTokenId, salePrice);
      }

      if (annuityPercent > 0) {
        _chargedSettings.setCreatorAnnuities(
          self,
          newTokenId,
          creator,
          annuityPercent
        );
      }
    }
  }

  function _chargeParticle(
    uint256 tokenId,
    string memory walletManagerId,
    address assetToken,
    uint256 assetAmount,
    address referrer
  )
    internal
    virtual
  {
    _collectAssetToken(_msgSender(), assetToken, assetAmount);

    IERC20(assetToken).approve(address(_chargedParticles), assetAmount);

    _chargedParticles.energizeParticle(
      address(this),
      tokenId,
      walletManagerId,
      assetToken,
      assetAmount,
      referrer
    );
  }

  function _buyProton(uint256 tokenId)
    internal
    virtual
    returns (bool)
  {
    uint256 salePrice = _tokenSalePrice[tokenId];
    require(salePrice > 0, "PRT:E-416");
    require(msg.value >= salePrice, "PRT:E-414");

    uint256 ownerAmount = salePrice;
    uint256 creatorAmount;
    address oldOwner = ownerOf(tokenId);
    address newOwner = _msgSender();

    // Creator Royalties
    address royaltiesReceiver = _creatorRoyaltiesReceiver(tokenId);
    uint256 royaltiesPct = _tokenCreatorRoyaltiesPct[tokenId];
    uint256 lastSellPrice = _tokenLastSellPrice[tokenId];
    if (royaltiesPct > 0 && lastSellPrice > 0 && salePrice > lastSellPrice) {
      creatorAmount = (salePrice - lastSellPrice).mul(royaltiesPct).div(PERCENTAGE_SCALE);
      ownerAmount = ownerAmount.sub(creatorAmount);
    }
    _tokenLastSellPrice[tokenId] = salePrice;

    // Signal to Universe Controller
    if (address(_universe) != address(0)) {
      _universe.onProtonSale(address(this), tokenId, oldOwner, newOwner, salePrice, royaltiesReceiver, creatorAmount);
    }

    // Unlock NFT
    _chargedState.setTemporaryLock(address(this), tokenId, false);

    // Reserve Royalties for Creator
    if (creatorAmount > 0) {
      _tokenCreatorClaimableRoyalties[royaltiesReceiver] = _tokenCreatorClaimableRoyalties[royaltiesReceiver].add(creatorAmount);
    }

    // Transfer Token
    _transfer(oldOwner, newOwner, tokenId);

    // Transfer Payment
    payable(oldOwner).sendValue(ownerAmount);

    emit ProtonSold(tokenId, oldOwner, newOwner, salePrice, royaltiesReceiver, creatorAmount);

    _refundOverpayment(salePrice);
    return true;
  }

  /**
    * @dev Pays out the Creator Royalties of the calling account
    * @param receiver  The receiver of the claimable royalties
    * @return          The amount of Creator Royalties claimed
    */
  function _claimCreatorRoyalties(address receiver) internal virtual returns (uint256) {
    uint256 claimableAmount = _tokenCreatorClaimableRoyalties[receiver];
    require(claimableAmount > 0, "PRT:E-411");

    delete _tokenCreatorClaimableRoyalties[receiver];
    payable(receiver).sendValue(claimableAmount);

    emit RoyaltiesClaimed(receiver, claimableAmount);
  }

  /**
    * @dev Collects the Required Asset Token from the users wallet
    * @param from         The owner address to collect the Assets from
    * @param assetAmount  The Amount of Asset Tokens to Collect
    */
  function _collectAssetToken(address from, address assetToken, uint256 assetAmount) internal virtual {
    uint256 _userAssetBalance = IERC20(assetToken).balanceOf(from);
    require(assetAmount <= _userAssetBalance, "PRT:E-411");
    // Be sure to Approve this Contract to transfer your Asset Token
    require(IERC20(assetToken).transferFrom(from, address(this), assetAmount), "PRT:E-401");
  }

  function _refundOverpayment(uint256 threshold) internal virtual {
    uint256 overage = msg.value.sub(threshold);
    if (overage > 0) {
      payable(_msgSender()).sendValue(overage);
    }
  }

  function _transfer(address from, address to, uint256 tokenId) internal virtual override {
    _tokenSalePrice[tokenId] = 0;
    _chargedState.setTemporaryLock(address(this), tokenId, false);
    super._transfer(from, to, tokenId);
  }


  /***********************************|
  |          GSN/MetaTx Relay         |
  |__________________________________*/

  /// @dev See {BaseRelayRecipient-_msgSender}.
  function _msgSender()
    internal
    view
    virtual
    override(BaseRelayRecipient, Context)
    returns (address payable)
  {
    return BaseRelayRecipient._msgSender();
  }

  /// @dev See {BaseRelayRecipient-_msgData}.
  function _msgData()
    internal
    view
    virtual
    override(BaseRelayRecipient, Context)
    returns (bytes memory)
  {
    return BaseRelayRecipient._msgData();
  }


  /***********************************|
  |             Modifiers             |
  |__________________________________*/

  modifier whenNotPaused() {
      require(!_paused, "PRT:E-101");
      _;
  }

  modifier onlyTokenOwnerOrApproved(uint256 tokenId) {
    require(_isApprovedOrOwner(_msgSender(), tokenId), "PRT:E-105");
    _;
  }

  modifier onlyTokenCreator(uint256 tokenId) {
    require(_tokenCreator[tokenId] == _msgSender(), "PRT:E-104");
    _;
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "@openzeppelin/contracts/GSN/Context.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Metadata.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Enumerable.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import "@openzeppelin/contracts/introspection/ERC165.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/EnumerableSet.sol";
import "@openzeppelin/contracts/utils/EnumerableMap.sol";
import "@openzeppelin/contracts/utils/Strings.sol";

/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable {
    using SafeMath for uint256;
    using Address for address;
    using EnumerableSet for EnumerableSet.UintSet;
    using EnumerableMap for EnumerableMap.UintToAddressMap;
    using Strings for uint256;

    /**
     * @dev Emitted when `tokenId` token is transfered from `from` to `to`.
     */
    event TransferBatch(address indexed from, address indexed to, uint256 startTokenId, uint256 count);

    // 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 holder address to their (enumerable) set of owned tokens
    mapping (address => EnumerableSet.UintSet) private _holderTokens;

    // Enumerable mapping from token ids to their owners
    EnumerableMap.UintToAddressMap private _tokenOwners;

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

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

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Optional mapping for token URIs
    mapping(uint256 => string) private _tokenURIs;

    /*
     *     bytes4(keccak256('balanceOf(address)')) == 0x70a08231
     *     bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e
     *     bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3
     *     bytes4(keccak256('getApproved(uint256)')) == 0x081812fc
     *     bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
     *     bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5
     *     bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde
     *
     *     => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^
     *        0xa22cb465 ^ 0xe985e9c ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd
     */
    bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;

    /*
     *     bytes4(keccak256('name()')) == 0x06fdde03
     *     bytes4(keccak256('symbol()')) == 0x95d89b41
     *     bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd
     *
     *     => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f
     */
    bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;

    /*
     *     bytes4(keccak256('totalSupply()')) == 0x18160ddd
     *     bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59
     *     bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7
     *
     *     => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63
     */
    bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;

        // register the supported interfaces to conform to ERC721 via ERC165
        _registerInterface(_INTERFACE_ID_ERC721);
        _registerInterface(_INTERFACE_ID_ERC721_METADATA);
        _registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view override returns (uint256) {
        require(owner != address(0), "ERC721:E-403");

        return _holderTokens[owner].length();
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view override returns (address) {
        return _tokenOwners.get(tokenId, "ERC721:E-405");
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view override returns (string memory) {
        require(_exists(tokenId), "ERC721:E-405");
        return _tokenURIs[tokenId];
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view override returns (uint256) {
        return _holderTokens[owner].at(index);
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        // _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds
        return _tokenOwners.length();
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view override returns (uint256) {
        (uint256 tokenId, ) = _tokenOwners.at(index);
        return tokenId;
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ownerOf(tokenId);
        require(to != owner, "ERC721:E-111");

        require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()), "ERC721:E-105");

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view override returns (address) {
        require(_exists(tokenId), "ERC721:E-405");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721:E-111");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721:E-105");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721:E-105");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @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.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mecanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory _data) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721:E-402");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view returns (bool) {
        return _tokenOwners.contains(tokenId);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view returns (bool) {
        require(_exists(tokenId), "ERC721:E-405");
        address owner = ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(address to, uint256 tokenId, bytes memory _data) internal virtual {
        _mint(to, tokenId);
        require(_checkOnERC721Received(address(0), to, tokenId, _data), "ERC721:E-402");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMintBatch(address to, uint256 startTokenId, uint256 count, bytes memory _data) internal virtual {
        _mintBatch(to, startTokenId, count);
        require(_checkOnERC721Received(address(0), to, startTokenId, _data), "ERC721:E-402");
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721:E-403");
        require(!_exists(tokenId), "ERC721:E-407");

        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mintBatch(address to, uint256 startTokenId, uint256 count) internal virtual {
        require(to != address(0), "ERC721:E-403");
        require(!_exists(startTokenId), "ERC721:E-407");

        for (uint i = 0; i < count; i++) {
          uint256 tokenId = startTokenId.add(i);
          _holderTokens[to].add(tokenId);
          _tokenOwners.set(tokenId, to);
        }

        emit TransferBatch(address(0), to, startTokenId, count);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(address from, address to, uint256 tokenId) internal virtual {
        require(ownerOf(tokenId) == from, "ERC721:E-102");
        require(to != address(0), "ERC721:E-403");

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _holderTokens[from].remove(tokenId);
        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
        require(_exists(tokenId), "ERC721:E-405");
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data)
        private returns (bool)
    {
        if (!to.isContract()) {
            return true;
        }
        bytes memory returndata = to.functionCall(abi.encodeWithSelector(
            IERC721Receiver(to).onERC721Received.selector,
            _msgSender(),
            from,
            tokenId,
            _data
        ), "ERC721:E-402");
        bytes4 retval = abi.decode(returndata, (bytes4));
        return (retval == _ERC721_RECEIVED);
    }

    function _approve(address to, uint256 tokenId) private {
        _tokenApprovals[tokenId] = to;
        emit Approval(ownerOf(tokenId), to, tokenId);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot 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-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../GSN/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.
 */
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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../math/SafeMath.sol";

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 * Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the {SafeMath}
 * overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never
 * directly accessed.
 */
library Counters {
    using SafeMath for uint256;

    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        // The {SafeMath} overflow check can be skipped here, see the comment at the top
        counter._value += 1;
    }

    function decrement(Counter storage counter) internal {
        counter._value = counter._value.sub(1);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// SPDX-License-Identifier: MIT

// Proton.sol -- Part of the Charged Particles Protocol
// Copyright (c) 2021 Firma Lux, Inc. <https://charged.fi>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

import "../interfaces/IUniverse.sol";
import "../interfaces/IChargedState.sol";
import "../interfaces/IChargedSettings.sol";
import "../interfaces/IChargedParticles.sol";

import "../lib/BlackholePrevention.sol";
import "../lib/RelayRecipient.sol";


interface IProton is IERC721 {
  event UniverseSet(address indexed universe);
  event ChargedStateSet(address indexed chargedState);
  event ChargedSettingsSet(address indexed chargedSettings);
  event ChargedParticlesSet(address indexed chargedParticles);
  event PausedStateSet(bool isPaused);
  event SalePriceSet(uint256 indexed tokenId, uint256 salePrice);
  event CreatorRoyaltiesSet(uint256 indexed tokenId, uint256 royaltiesPct);
  event FeesWithdrawn(address indexed receiver, uint256 amount);
  event ProtonSold(uint256 indexed tokenId, address indexed oldOwner, address indexed newOwner, uint256 salePrice, address creator, uint256 creatorRoyalties);
  event RoyaltiesClaimed(address indexed receiver, uint256 amountClaimed);

  /***********************************|
  |              Public               |
  |__________________________________*/

  function creatorOf(uint256 tokenId) external view returns (address);
  function getSalePrice(uint256 tokenId) external view returns (uint256);
  function getLastSellPrice(uint256 tokenId) external view returns (uint256);
  function getCreatorRoyalties(address account) external view returns (uint256);
  function getCreatorRoyaltiesPct(uint256 tokenId) external view returns (uint256);
  function getCreatorRoyaltiesReceiver(uint256 tokenId) external view returns (address);

  function buyProton(uint256 tokenId) external payable returns (bool);
  function claimCreatorRoyalties() external returns (uint256);

  function createChargedParticle(
    address creator,
    address receiver,
    address referrer,
    string memory tokenMetaUri,
    string memory walletManagerId,
    address assetToken,
    uint256 assetAmount,
    uint256 annuityPercent
  ) external returns (uint256 newTokenId);

  function createBasicProton(
    address creator,
    address receiver,
    string memory tokenMetaUri
  ) external returns (uint256 newTokenId);

  function createProton(
    address creator,
    address receiver,
    string memory tokenMetaUri,
    uint256 annuityPercent
  ) external returns (uint256 newTokenId);

  function createProtonForSale(
    address creator,
    address receiver,
    string memory tokenMetaUri,
    uint256 annuityPercent,
    uint256 royaltiesPercent,
    uint256 salePrice
  ) external returns (uint256 newTokenId);

  function batchProtonsForSale(
    address creator,
    uint256 annuityPercent,
    uint256 royaltiesPercent,
    string[] calldata tokenMetaUris,
    uint256[] calldata salePrices
  ) external;

  /***********************************|
  |     Only Token Creator/Owner      |
  |__________________________________*/

  function setSalePrice(uint256 tokenId, uint256 salePrice) external;
  function setRoyaltiesPct(uint256 tokenId, uint256 royaltiesPct) external;
  function setCreatorRoyaltiesReceiver(uint256 tokenId, address receiver) external;
}

// SPDX-License-Identifier: MIT

// IUniverse.sol -- Part of the Charged Particles Protocol
// Copyright (c) 2021 Firma Lux, Inc. <https://charged.fi>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

pragma solidity >=0.6.0;

/**
 * @title Universal Controller interface
 * @dev ...
 */
interface IUniverse {

  event ChargedParticlesSet(address indexed chargedParticles);
  event PhotonSet(address indexed photonToken, uint256 maxSupply);
  event ProtonTokenSet(address indexed protonToken);
  event LeptonTokenSet(address indexed leptonToken);
  event QuarkTokenSet(address indexed quarkToken);
  event BosonTokenSet(address indexed bosonToken);
  event EsaMultiplierSet(address indexed assetToken, uint256 multiplier);
  event ElectrostaticAttraction(address indexed account, address photonSource, uint256 energy, uint256 multiplier);
  event ElectrostaticDischarge(address indexed account, address photonSource, uint256 energy);

  function onEnergize(
    address sender,
    address referrer,
    address contractAddress,
    uint256 tokenId,
    string calldata managerId,
    address assetToken,
    uint256 assetEnergy
  ) external;

  function onDischarge(
    address contractAddress,
    uint256 tokenId,
    string calldata managerId,
    address assetToken,
    uint256 creatorEnergy,
    uint256 receiverEnergy
  ) external;

  function onDischargeForCreator(
    address contractAddress,
    uint256 tokenId,
    string calldata managerId,
    address creator,
    address assetToken,
    uint256 receiverEnergy
  ) external;

  function onRelease(
    address contractAddress,
    uint256 tokenId,
    string calldata managerId,
    address assetToken,
    uint256 principalEnergy,
    uint256 creatorEnergy,
    uint256 receiverEnergy
  ) external;

  function onCovalentBond(
    address contractAddress,
    uint256 tokenId,
    string calldata managerId,
    address nftTokenAddress,
    uint256 nftTokenId
  ) external;

  function onCovalentBreak(
    address contractAddress,
    uint256 tokenId,
    string calldata managerId,
    address nftTokenAddress,
    uint256 nftTokenId
  ) external;

  function onProtonSale(
    address contractAddress,
    uint256 tokenId,
    address oldOwner,
    address newOwner,
    uint256 salePrice,
    address creator,
    uint256 creatorRoyalties
  ) external;
}

// SPDX-License-Identifier: MIT

// IChargedSettings.sol -- Part of the Charged Particles Protocol
// Copyright (c) 2021 Firma Lux, Inc. <https://charged.fi>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

pragma solidity >=0.6.0;

import "./IChargedSettings.sol";

/**
 * @notice Interface for Charged State
 */
interface IChargedState {

  /***********************************|
  |             Public API            |
  |__________________________________*/

  function getDischargeTimelockExpiry(address contractAddress, uint256 tokenId) external view returns (uint256 lockExpiry);
  function getReleaseTimelockExpiry(address contractAddress, uint256 tokenId) external view returns (uint256 lockExpiry);
  function getBreakBondTimelockExpiry(address contractAddress, uint256 tokenId) external view returns (uint256 lockExpiry);

  function isApprovedForDischarge(address contractAddress, uint256 tokenId, address operator) external view returns (bool);
  function isApprovedForRelease(address contractAddress, uint256 tokenId, address operator) external view returns (bool);
  function isApprovedForBreakBond(address contractAddress, uint256 tokenId, address operator) external view returns (bool);
  function isApprovedForTimelock(address contractAddress, uint256 tokenId, address operator) external view returns (bool);

  function isEnergizeRestricted(address contractAddress, uint256 tokenId) external view returns (bool);
  function isCovalentBondRestricted(address contractAddress, uint256 tokenId) external view returns (bool);

  function getDischargeState(address contractAddress, uint256 tokenId, address sender) external view
    returns (bool allowFromAll, bool isApproved, uint256 timelock, uint256 tempLockExpiry);
  function getReleaseState(address contractAddress, uint256 tokenId, address sender) external view
    returns (bool allowFromAll, bool isApproved, uint256 timelock, uint256 tempLockExpiry);
  function getBreakBondState(address contractAddress, uint256 tokenId, address sender) external view
    returns (bool allowFromAll, bool isApproved, uint256 timelock, uint256 tempLockExpiry);

  /***********************************|
  |      Only NFT Owner/Operator      |
  |__________________________________*/

  function setDischargeApproval(address contractAddress, uint256 tokenId, address operator) external;
  function setReleaseApproval(address contractAddress, uint256 tokenId, address operator) external;
  function setBreakBondApproval(address contractAddress, uint256 tokenId, address operator) external;
  function setTimelockApproval(address contractAddress, uint256 tokenId, address operator) external;
  function setApprovalForAll(address contractAddress, uint256 tokenId, address operator) external;

  function setPermsForRestrictCharge(address contractAddress, uint256 tokenId, bool state) external;
  function setPermsForAllowDischarge(address contractAddress, uint256 tokenId, bool state) external;
  function setPermsForAllowRelease(address contractAddress, uint256 tokenId, bool state) external;
  function setPermsForRestrictBond(address contractAddress, uint256 tokenId, bool state) external;
  function setPermsForAllowBreakBond(address contractAddress, uint256 tokenId, bool state) external;

  function setDischargeTimelock(
    address contractAddress,
    uint256 tokenId,
    uint256 unlockBlock
  ) external;

  function setReleaseTimelock(
    address contractAddress,
    uint256 tokenId,
    uint256 unlockBlock
  ) external;

  function setBreakBondTimelock(
    address contractAddress,
    uint256 tokenId,
    uint256 unlockBlock
  ) external;

  /***********************************|
  |         Only NFT Contract         |
  |__________________________________*/

  function setTemporaryLock(
    address contractAddress,
    uint256 tokenId,
    bool isLocked
  ) external;

  /***********************************|
  |          Particle Events          |
  |__________________________________*/

  event ChargedSettingsSet(address indexed settingsController);

  event DischargeApproval(address indexed contractAddress, uint256 indexed tokenId, address indexed owner, address operator);
  event ReleaseApproval(address indexed contractAddress, uint256 indexed tokenId, address indexed owner, address operator);
  event BreakBondApproval(address indexed contractAddress, uint256 indexed tokenId, address indexed owner, address operator);
  event TimelockApproval(address indexed contractAddress, uint256 indexed tokenId, address indexed owner, address operator);

  event TokenDischargeTimelock(address indexed contractAddress, uint256 indexed tokenId, address indexed operator, uint256 unlockBlock);
  event TokenReleaseTimelock(address indexed contractAddress, uint256 indexed tokenId, address indexed operator, uint256 unlockBlock);
  event TokenBreakBondTimelock(address indexed contractAddress, uint256 indexed tokenId, address indexed operator, uint256 unlockBlock);
  event TokenTempLock(address indexed contractAddress, uint256 indexed tokenId, uint256 unlockBlock);

  event PermsSetForRestrictCharge(address indexed contractAddress, uint256 indexed tokenId, bool state);
  event PermsSetForAllowDischarge(address indexed contractAddress, uint256 indexed tokenId, bool state);
  event PermsSetForAllowRelease(address indexed contractAddress, uint256 indexed tokenId, bool state);
  event PermsSetForRestrictBond(address indexed contractAddress, uint256 indexed tokenId, bool state);
  event PermsSetForAllowBreakBond(address indexed contractAddress, uint256 indexed tokenId, bool state);
}

// SPDX-License-Identifier: MIT

// IChargedSettings.sol -- Part of the Charged Particles Protocol
// Copyright (c) 2021 Firma Lux, Inc. <https://charged.fi>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

pragma solidity >=0.6.0;

import "./IWalletManager.sol";
import "./IBasketManager.sol";

/**
 * @notice Interface for Charged Settings
 */
interface IChargedSettings {

  /***********************************|
  |             Public API            |
  |__________________________________*/

  function isContractOwner(address contractAddress, address account) external view returns (bool);
  function getCreatorAnnuities(address contractAddress, uint256 tokenId) external view returns (address creator, uint256 annuityPct);
  function getCreatorAnnuitiesRedirect(address contractAddress, uint256 tokenId) external view returns (address);
  function getTempLockExpiryBlocks() external view returns (uint256);
  function getTimelockApprovals(address operator) external view returns (bool timelockAny, bool timelockOwn);
  function getAssetRequirements(address contractAddress, address assetToken) external view
    returns (string memory requiredWalletManager, bool energizeEnabled, bool restrictedAssets, bool validAsset, uint256 depositCap, uint256 depositMin, uint256 depositMax);
  function getNftAssetRequirements(address contractAddress, address nftTokenAddress) external view
    returns (string memory requiredBasketManager, bool basketEnabled, uint256 maxNfts);

  // ERC20
  function isWalletManagerEnabled(string calldata walletManagerId) external view returns (bool);
  function getWalletManager(string calldata walletManagerId) external view returns (IWalletManager);

  // ERC721
  function isNftBasketEnabled(string calldata basketId) external view returns (bool);
  function getBasketManager(string calldata basketId) external view returns (IBasketManager);

  /***********************************|
  |         Only NFT Creator          |
  |__________________________________*/

  function setCreatorAnnuities(address contractAddress, uint256 tokenId, address creator, uint256 annuityPercent) external;
  function setCreatorAnnuitiesRedirect(address contractAddress, uint256 tokenId, address creator, address receiver) external;


  /***********************************|
  |      Only NFT Contract Owner      |
  |__________________________________*/

  function setRequiredWalletManager(address contractAddress, string calldata walletManager) external;
  function setRequiredBasketManager(address contractAddress, string calldata basketManager) external;
  function setAssetTokenRestrictions(address contractAddress, bool restrictionsEnabled) external;
  function setAllowedAssetToken(address contractAddress, address assetToken, bool isAllowed) external;
  function setAssetTokenLimits(address contractAddress, address assetToken, uint256 depositMin, uint256 depositMax) external;
  function setMaxNfts(address contractAddress, address nftTokenAddress, uint256 maxNfts) external;

  /***********************************|
  |          Only Admin/DAO           |
  |__________________________________*/

  function enableNftContracts(address[] calldata contracts) external;
  function setPermsForCharge(address contractAddress, bool state) external;
  function setPermsForBasket(address contractAddress, bool state) external;
  function setPermsForTimelockAny(address contractAddress, bool state) external;
  function setPermsForTimelockSelf(address contractAddress, bool state) external;

  /***********************************|
  |          Particle Events          |
  |__________________________________*/

  event DepositCapSet(address assetToken, uint256 depositCap);
  event TempLockExpirySet(uint256 expiryBlocks);

  event WalletManagerRegistered(string indexed walletManagerId, address indexed walletManager);
  event BasketManagerRegistered(string indexed basketId, address indexed basketManager);

  event RequiredWalletManagerSet(address indexed contractAddress, string walletManager);
  event RequiredBasketManagerSet(address indexed contractAddress, string basketManager);
  event AssetTokenRestrictionsSet(address indexed contractAddress, bool restrictionsEnabled);
  event AllowedAssetTokenSet(address indexed contractAddress, address assetToken, bool isAllowed);
  event AssetTokenLimitsSet(address indexed contractAddress, address assetToken, uint256 assetDepositMin, uint256 assetDepositMax);
  event MaxNftsSet(address indexed contractAddress, address indexed nftTokenAddress, uint256 maxNfts);

  event TokenCreatorConfigsSet(address indexed contractAddress, uint256 indexed tokenId, address indexed creatorAddress, uint256 annuityPercent);
  event TokenCreatorAnnuitiesRedirected(address indexed contractAddress, uint256 indexed tokenId, address indexed redirectAddress);

  event PermsSetForCharge(address indexed contractAddress, bool state);
  event PermsSetForBasket(address indexed contractAddress, bool state);
  event PermsSetForTimelockAny(address indexed contractAddress, bool state);
  event PermsSetForTimelockSelf(address indexed contractAddress, bool state);
}

// SPDX-License-Identifier: MIT

// IChargedParticles.sol -- Part of the Charged Particles Protocol
// Copyright (c) 2021 Firma Lux, Inc. <https://charged.fi>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

pragma solidity >=0.6.0;

/**
 * @notice Interface for Charged Particles
 */
interface IChargedParticles {

  /***********************************|
  |             Public API            |
  |__________________________________*/

  function getStateAddress() external view returns (address stateAddress);
  function getSettingsAddress() external view returns (address settingsAddress);

  function baseParticleMass(address contractAddress, uint256 tokenId, string calldata walletManagerId, address assetToken) external returns (uint256);
  function currentParticleCharge(address contractAddress, uint256 tokenId, string calldata walletManagerId, address assetToken) external returns (uint256);
  function currentParticleKinetics(address contractAddress, uint256 tokenId, string calldata walletManagerId, address assetToken) external returns (uint256);
  function currentParticleCovalentBonds(address contractAddress, uint256 tokenId, string calldata basketManagerId) external view returns (uint256);

  /***********************************|
  |        Particle Mechanics         |
  |__________________________________*/

  function energizeParticle(
      address contractAddress,
      uint256 tokenId,
      string calldata walletManagerId,
      address assetToken,
      uint256 assetAmount,
    address referrer
  ) external returns (uint256 yieldTokensAmount);

  function dischargeParticle(
      address receiver,
      address contractAddress,
      uint256 tokenId,
      string calldata walletManagerId,
      address assetToken
  ) external returns (uint256 creatorAmount, uint256 receiverAmount);

  function dischargeParticleAmount(
      address receiver,
      address contractAddress,
      uint256 tokenId,
      string calldata walletManagerId,
      address assetToken,
      uint256 assetAmount
  ) external returns (uint256 creatorAmount, uint256 receiverAmount);

  function dischargeParticleForCreator(
      address receiver,
      address contractAddress,
      uint256 tokenId,
      string calldata walletManagerId,
      address assetToken,
      uint256 assetAmount
  ) external returns (uint256 receiverAmount);

  function releaseParticle(
      address receiver,
      address contractAddress,
      uint256 tokenId,
      string calldata walletManagerId,
      address assetToken
  ) external returns (uint256 creatorAmount, uint256 receiverAmount);

  function releaseParticleAmount(
    address receiver,
    address contractAddress,
    uint256 tokenId,
    string calldata walletManagerId,
    address assetToken,
    uint256 assetAmount
  ) external returns (uint256 creatorAmount, uint256 receiverAmount);

  function covalentBond(
    address contractAddress,
    uint256 tokenId,
    string calldata basketManagerId,
    address nftTokenAddress,
    uint256 nftTokenId
  ) external returns (bool success);

  function breakCovalentBond(
    address receiver,
    address contractAddress,
    uint256 tokenId,
    string calldata basketManagerId,
    address nftTokenAddress,
    uint256 nftTokenId
  ) external returns (bool success);

  /***********************************|
  |          Particle Events          |
  |__________________________________*/

  event UniverseSet(address indexed universeAddress);
  event ChargedStateSet(address indexed chargedState);
  event ChargedSettingsSet(address indexed chargedSettings);
  event LeptonTokenSet(address indexed leptonToken);
}

// SPDX-License-Identifier: MIT

// BlackholePrevention.sol -- Part of the Charged Particles Protocol
// Copyright (c) 2021 Firma Lux, Inc. <https://charged.fi>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

pragma solidity >=0.6.0;

import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

/**
 * @notice Prevents ETH or Tokens from getting stuck in a contract by allowing
 *  the Owner/DAO to pull them out on behalf of a user
 * This is only meant to contracts that are not expected to hold tokens, but do handle transferring them.
 */
contract BlackholePrevention {
  using Address for address payable;
  using SafeERC20 for IERC20;

  event WithdrawStuckEther(address indexed receiver, uint256 amount);
  event WithdrawStuckERC20(address indexed receiver, address indexed tokenAddress, uint256 amount);
  event WithdrawStuckERC721(address indexed receiver, address indexed tokenAddress, uint256 indexed tokenId);

  function _withdrawEther(address payable receiver, uint256 amount) internal virtual {
    require(receiver != address(0x0), "BHP:E-403");
    if (address(this).balance >= amount) {
      receiver.sendValue(amount);
      emit WithdrawStuckEther(receiver, amount);
    }
  }

  function _withdrawERC20(address payable receiver, address tokenAddress, uint256 amount) internal virtual {
    require(receiver != address(0x0), "BHP:E-403");
    if (IERC20(tokenAddress).balanceOf(address(this)) >= amount) {
      IERC20(tokenAddress).safeTransfer(receiver, amount);
      emit WithdrawStuckERC20(receiver, tokenAddress, amount);
    }
  }

  function _withdrawERC721(address payable receiver, address tokenAddress, uint256 tokenId) internal virtual {
    require(receiver != address(0x0), "BHP:E-403");
    if (IERC721(tokenAddress).ownerOf(tokenId) == address(this)) {
      IERC721(tokenAddress).transferFrom(address(this), receiver, tokenId);
      emit WithdrawStuckERC721(receiver, tokenAddress, tokenId);
    }
  }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0;

import "@opengsn/gsn/contracts/BaseRelayRecipient.sol";

contract RelayRecipient is BaseRelayRecipient {
  function versionRecipient() external override view returns (string memory) {
    return "1.0.0-beta.1/charged-particles.relay.recipient";
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

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

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transfered 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;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

import "./IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {

    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

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);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data)
    external returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
contract ERC165 is IERC165 {
    /*
     * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
     */
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    constructor () internal {
        // Derived contracts need only register support for their own interfaces,
        // we register support for ERC165 itself here
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     *
     * Time complexity O(1), guaranteed to always use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) public view override returns (bool) {
        return _supportedInterfaces[interfaceId];
    }

    /**
     * @dev Registers the contract as an implementer of the interface defined by
     * `interfaceId`. Support of the actual ERC165 interface is automatic and
     * registering its interface id is not required.
     *
     * See {IERC165-supportsInterface}.
     *
     * Requirements:
     *
     * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
     */
    function _registerInterface(bytes4 interfaceId) internal virtual {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256`
 * (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint256(_at(set._inner, index)));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Library for managing an enumerable variant of Solidity's
 * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]
 * type.
 *
 * Maps have the following properties:
 *
 * - Entries are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Entries are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableMap for EnumerableMap.UintToAddressMap;
 *
 *     // Declare a set state variable
 *     EnumerableMap.UintToAddressMap private myMap;
 * }
 * ```
 *
 * As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are
 * supported.
 */
library EnumerableMap {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Map type with
    // bytes32 keys and values.
    // The Map implementation uses private functions, and user-facing
    // implementations (such as Uint256ToAddressMap) are just wrappers around
    // the underlying Map.
    // This means that we can only create new EnumerableMaps for types that fit
    // in bytes32.

    struct MapEntry {
        bytes32 _key;
        bytes32 _value;
    }

    struct Map {
        // Storage of map keys and values
        MapEntry[] _entries;

        // Position of the entry defined by a key in the `entries` array, plus 1
        // because index 0 means a key is not in the map.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function _set(Map storage map, bytes32 key, bytes32 value) private returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex == 0) { // Equivalent to !contains(map, key)
            map._entries.push(MapEntry({ _key: key, _value: value }));
            // The entry is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            map._indexes[key] = map._entries.length;
            return true;
        } else {
            map._entries[keyIndex - 1]._value = value;
            return false;
        }
    }

    /**
     * @dev Removes a key-value pair from a map. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function _remove(Map storage map, bytes32 key) private returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex != 0) { // Equivalent to contains(map, key)
            // To delete a key-value pair from the _entries array in O(1), we swap the entry to delete with the last one
            // in the array, and then remove the last entry (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = keyIndex - 1;
            uint256 lastIndex = map._entries.length - 1;

            // When the entry to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            MapEntry storage lastEntry = map._entries[lastIndex];

            // Move the last entry to the index where the entry to delete is
            map._entries[toDeleteIndex] = lastEntry;
            // Update the index for the moved entry
            map._indexes[lastEntry._key] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved entry was stored
            map._entries.pop();

            // Delete the index for the deleted slot
            delete map._indexes[key];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function _contains(Map storage map, bytes32 key) private view returns (bool) {
        return map._indexes[key] != 0;
    }

    /**
     * @dev Returns the number of key-value pairs in the map. O(1).
     */
    function _length(Map storage map) private view returns (uint256) {
        return map._entries.length;
    }

   /**
    * @dev Returns the key-value pair stored at position `index` in the map. O(1).
    *
    * Note that there are no guarantees on the ordering of entries inside the
    * array, and it may change when more entries are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Map storage map, uint256 index) private view returns (bytes32, bytes32) {
        require(map._entries.length > index, "EnumerableMap: index out of bounds");

        MapEntry storage entry = map._entries[index];
        return (entry._key, entry._value);
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function _get(Map storage map, bytes32 key) private view returns (bytes32) {
        return _get(map, key, "EnumerableMap: nonexistent key");
    }

    /**
     * @dev Same as {_get}, with a custom error message when `key` is not in the map.
     */
    function _get(Map storage map, bytes32 key, string memory errorMessage) private view returns (bytes32) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, errorMessage); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    // UintToAddressMap

    struct UintToAddressMap {
        Map _inner;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(UintToAddressMap storage map, uint256 key, address value) internal returns (bool) {
        return _set(map._inner, bytes32(key), bytes32(uint256(value)));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function remove(UintToAddressMap storage map, uint256 key) internal returns (bool) {
        return _remove(map._inner, bytes32(key));
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function contains(UintToAddressMap storage map, uint256 key) internal view returns (bool) {
        return _contains(map._inner, bytes32(key));
    }

    /**
     * @dev Returns the number of elements in the map. O(1).
     */
    function length(UintToAddressMap storage map) internal view returns (uint256) {
        return _length(map._inner);
    }

   /**
    * @dev Returns the element stored at position `index` in the set. O(1).
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) {
        (bytes32 key, bytes32 value) = _at(map._inner, index);
        return (uint256(key), address(uint256(value)));
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(UintToAddressMap storage map, uint256 key) internal view returns (address) {
        return address(uint256(_get(map._inner, bytes32(key))));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     */
    function get(UintToAddressMap storage map, uint256 key, string memory errorMessage) internal view returns (address) {
        return address(uint256(_get(map._inner, bytes32(key), errorMessage)));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev String operations.
 */
library Strings {
    /**
     * @dev Converts a `uint256` to its ASCII `string` 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);
        uint256 index = digits - 1;
        temp = value;
        while (temp != 0) {
            buffer[index--] = byte(uint8(48 + temp % 10));
            temp /= 10;
        }
        return string(buffer);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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);
}

// SPDX-License-Identifier: MIT

// IWalletManager.sol -- Part of the Charged Particles Protocol
// Copyright (c) 2021 Firma Lux, Inc. <https://charged.fi>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

pragma solidity >=0.6.0;

/**
 * @title Particle Wallet Manager interface
 * @dev The wallet-manager for underlying assets attached to Charged Particles
 * @dev Manages the link between NFTs and their respective Smart-Wallets
 */
interface IWalletManager {

  event ControllerSet(address indexed controller);
  event PausedStateSet(bool isPaused);
  event NewSmartWallet(address indexed contractAddress, uint256 indexed tokenId, address indexed smartWallet, address creator, uint256 annuityPct);
  event WalletEnergized(address indexed contractAddress, uint256 indexed tokenId, address indexed assetToken, uint256 assetAmount, uint256 yieldTokensAmount);
  event WalletDischarged(address indexed contractAddress, uint256 indexed tokenId, address indexed assetToken, uint256 creatorAmount, uint256 receiverAmount);
  event WalletDischargedForCreator(address indexed contractAddress, uint256 indexed tokenId, address indexed assetToken, address creator, uint256 receiverAmount);
  event WalletReleased(address indexed contractAddress, uint256 indexed tokenId, address indexed receiver, address assetToken, uint256 principalAmount, uint256 creatorAmount, uint256 receiverAmount);
  event WalletRewarded(address indexed contractAddress, uint256 indexed tokenId, address indexed receiver, address rewardsToken, uint256 rewardsAmount);

  function isPaused() external view returns (bool);

  function isReserveActive(address contractAddress, uint256 tokenId, address assetToken) external view returns (bool);
  function getReserveInterestToken(address contractAddress, uint256 tokenId, address assetToken) external view returns (address);

  function getTotal(address contractAddress, uint256 tokenId, address assetToken) external returns (uint256);
  function getPrincipal(address contractAddress, uint256 tokenId, address assetToken) external returns (uint256);
  function getInterest(address contractAddress, uint256 tokenId, address assetToken) external returns (uint256 creatorInterest, uint256 ownerInterest);
  function getRewards(address contractAddress, uint256 tokenId, address rewardToken) external returns (uint256);

  function energize(address contractAddress, uint256 tokenId, address assetToken, uint256 assetAmount) external returns (uint256 yieldTokensAmount);
  function discharge(address receiver, address contractAddress, uint256 tokenId, address assetToken, address creatorRedirect) external returns (uint256 creatorAmount, uint256 receiverAmount);
  function dischargeAmount(address receiver, address contractAddress, uint256 tokenId, address assetToken, uint256 assetAmount, address creatorRedirect) external returns (uint256 creatorAmount, uint256 receiverAmount);
  function dischargeAmountForCreator(address receiver, address contractAddress, uint256 tokenId, address creator, address assetToken, uint256 assetAmount) external returns (uint256 receiverAmount);
  function release(address receiver, address contractAddress, uint256 tokenId, address assetToken, address creatorRedirect) external returns (uint256 principalAmount, uint256 creatorAmount, uint256 receiverAmount);
  function releaseAmount(address receiver, address contractAddress, uint256 tokenId, address assetToken, uint256 assetAmount, address creatorRedirect) external returns (uint256 principalAmount, uint256 creatorAmount, uint256 receiverAmount);
  function withdrawRewards(address receiver, address contractAddress, uint256 tokenId, address rewardsToken, uint256 rewardsAmount) external returns (uint256 amount);
  function executeForAccount(address contractAddress, uint256 tokenId, address externalAddress, uint256 ethValue, bytes memory encodedParams) external returns (bytes memory);
  function getWalletAddressById(address contractAddress, uint256 tokenId, address creator, uint256 annuityPct) external returns (address);

  function withdrawEther(address contractAddress, uint256 tokenId, address payable receiver, uint256 amount) external;
  function withdrawERC20(address contractAddress, uint256 tokenId, address payable receiver, address tokenAddress, uint256 amount) external;
  function withdrawERC721(address contractAddress, uint256 tokenId, address payable receiver, address nftTokenAddress, uint256 nftTokenId) external;
}

// SPDX-License-Identifier: MIT

// IBasketManager.sol -- Part of the Charged Particles Protocol
// Copyright (c) 2021 Firma Lux, Inc. <https://charged.fi>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

pragma solidity >=0.6.0;

/**
 * @title Particle Basket Manager interface
 * @dev The basket-manager for underlying assets attached to Charged Particles
 * @dev Manages the link between NFTs and their respective Smart-Baskets
 */
interface IBasketManager {

  event ControllerSet(address indexed controller);
  event PausedStateSet(bool isPaused);
  event NewSmartBasket(address indexed contractAddress, uint256 indexed tokenId, address indexed smartBasket);
  event BasketAdd(address indexed contractAddress, uint256 indexed tokenId, address basketTokenAddress, uint256 basketTokenId);
  event BasketRemove(address indexed receiver, address indexed contractAddress, uint256 indexed tokenId, address basketTokenAddress, uint256 basketTokenId);

  function isPaused() external view returns (bool);

  function getTokenTotalCount(address contractAddress, uint256 tokenId) external view returns (uint256);
  function getTokenCountByType(address contractAddress, uint256 tokenId, address basketTokenAddress, uint256 basketTokenId) external returns (uint256);

  function addToBasket(address contractAddress, uint256 tokenId, address basketTokenAddress, uint256 basketTokenId) external returns (bool);
  function removeFromBasket(address receiver, address contractAddress, uint256 tokenId, address basketTokenAddress, uint256 basketTokenId) external returns (bool);
  function executeForAccount(address contractAddress, uint256 tokenId, address externalAddress, uint256 ethValue, bytes memory encodedParams) external returns (bytes memory);
  function getBasketAddressById(address contractAddress, uint256 tokenId) external returns (address);

  function withdrawEther(address contractAddress, uint256 tokenId, address payable receiver, uint256 amount) external;
  function withdrawERC20(address contractAddress, uint256 tokenId, address payable receiver, address tokenAddress, uint256 amount) external;
  function withdrawERC721(address contractAddress, uint256 tokenId, address payable receiver, address nftTokenAddress, uint256 nftTokenId) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier:MIT
// solhint-disable no-inline-assembly
pragma solidity ^0.6.2;

import "./interfaces/IRelayRecipient.sol";

/**
 * A base contract to be inherited by any contract that want to receive relayed transactions
 * A subclass must use "_msgSender()" instead of "msg.sender"
 */
abstract contract BaseRelayRecipient is IRelayRecipient {

    /*
     * Forwarder singleton we accept calls from
     */
    address public trustedForwarder;

    function isTrustedForwarder(address forwarder) public override view returns(bool) {
        return forwarder == trustedForwarder;
    }

    /**
     * return the sender of this call.
     * if the call came through our trusted forwarder, return the original sender.
     * otherwise, return `msg.sender`.
     * should be used in the contract anywhere instead of msg.sender
     */
    function _msgSender() internal override virtual view returns (address payable ret) {
        if (msg.data.length >= 24 && isTrustedForwarder(msg.sender)) {
            // At this point we know that the sender is a trusted forwarder,
            // so we trust that the last bytes of msg.data are the verified sender address.
            // extract sender address from the end of msg.data
            assembly {
                ret := shr(96,calldataload(sub(calldatasize(),20)))
            }
        } else {
            return msg.sender;
        }
    }

    /**
     * return the msg.data of this call.
     * if the call came through our trusted forwarder, then the real sender was appended as the last 20 bytes
     * of the msg.data - so this method will strip those 20 bytes off.
     * otherwise, return `msg.data`
     * should be used in the contract instead of msg.data, where the difference matters (e.g. when explicitly
     * signing or hashing the
     */
    function _msgData() internal override virtual view returns (bytes memory ret) {
        if (msg.data.length >= 24 && isTrustedForwarder(msg.sender)) {
            // At this point we know that the sender is a trusted forwarder,
            // we copy the msg.data , except the last 20 bytes (and update the total length)
            assembly {
                let ptr := mload(0x40)
                // copy only size-20 bytes
                let size := sub(calldatasize(),20)
                // structure RLP data as <offset> <length> <bytes>
                mstore(ptr, 0x20)
                mstore(add(ptr,32), size)
                calldatacopy(add(ptr,64), 0, size)
                return(ptr, add(size,64))
            }
        } else {
            return msg.data;
        }
    }
}

// SPDX-License-Identifier:MIT
pragma solidity ^0.6.2;

/**
 * a contract must implement this interface in order to support relayed transaction.
 * It is better to inherit the BaseRelayRecipient as its implementation.
 */
abstract contract IRelayRecipient {

    /**
     * return if the forwarder is trusted to forward relayed transactions to us.
     * the forwarder is required to verify the sender's signature, and verify
     * the call is not a replay.
     */
    function isTrustedForwarder(address forwarder) public virtual view returns(bool);

    /**
     * return the sender of this call.
     * if the call came through our trusted forwarder, then the real sender is appended as the last 20 bytes
     * of the msg.data.
     * otherwise, return `msg.sender`
     * should be used in the contract anywhere instead of msg.sender
     */
    function _msgSender() internal virtual view returns (address payable);

    /**
     * return the msg.data of this call.
     * if the call came through our trusted forwarder, then the real sender was appended as the last 20 bytes
     * of the msg.data - so this method will strip those 20 bytes off.
     * otherwise, return `msg.data`
     * should be used in the contract instead of msg.data, where the difference matters (e.g. when explicitly
     * signing or hashing the
     */
    function _msgData() internal virtual view returns (bytes memory);

    function versionRecipient() external virtual view returns (string memory);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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