// File: contracts/Satoshiverse.sol



//SPDX-License-Identifier: GNU General Public License v3.0

          
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  //                                                
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  //

/*
*Welcome to the Satoshiverse! The Satoshiverse is an epic comic NFT collaboration between Apollo NFT Studios, Jose Delbo, and YOU, the NFT community. 
*It tells the story of our hero, Satoshi The Creator and his quest to save the world from the Defenders of Fiat and the many other foes who lie ahead.
*/ 
pragma solidity ^0.8.0;

import "@chainlink/contracts/src/v0.8/VRFConsumerBase.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "./interfaces/ILegionnaire.sol";
import "./utils/Operatorable.sol";
import "./helpers/NumberHelper.sol";


 /**
    * Satoshiverse Legionnaire Avatar NFT Contract V1 
    * Provided by Satoshiverse LLC
    * Authored by brnaldomesi a Senior Solidity Developer @ Herasoft
    */
contract Satoshiverse is VRFConsumerBase, Operatorable, ReentrancyGuard {
  ILegionnaire public legionnaire;

  // Payable Address for the Initial Sale
  address payable public svEthAddr = payable(0x981268bF660454e24DBEa9020D57C2504a538C57);
  
  uint16 _claimSV = 190;
  uint16 _purchaseSV = 3301;

  uint256 SV_MAX = 10000;
  
  uint256 _activeDateTime; 
  uint256 INTERVAL = 3600;
  uint256 randNonce;
  
  // Chainlink
  uint256 randomNess;
  uint256 internal fee;
  bytes32 internal keyHash;
  
  bool revealState;

  bool public claimState = true;
  bool public purchaseState = true;

  bytes32 requestId;

  string[] public leftoverUris;

  mapping(address => mapping(string => uint8)) public tokensCount;

  // Only through Day 4 Mints
  mapping(address => uint8) public purchasedSoFar;
  

  // Set Initial Addresses and Variables Upon Deployment
  constructor(
    address _operator,
    address _uriSetter,
    address _legionnaire,
    address _vrfCoordinator,
    address _link,
    bytes32 _keyHash,
    uint256 _fee
  ) 
    VRFConsumerBase(_vrfCoordinator, _link)
  {
    keyHash = _keyHash;
    fee = _fee;

    legionnaire = ILegionnaire(_legionnaire);

    addOperator(_operator);
    addURISetter(_uriSetter);
  }

// Change the Payment Adddress if Necessary
  function setPaymentAddress(address _svEthAddr) external onlyOwner {
    svEthAddr = payable(_svEthAddr);
  }

 // Operator Account Sets the Contract with a List of Presale Holders Addresses
 // Snapshot was taken 12pm EST Monday November 22, 2021
  function seedPresaleWhiteList(address[] calldata users, string calldata tokenType, uint8[] calldata counts) external onlyOperator {
    require(users.length == counts.length, "Mismatched presale addresses and counts");

    for(uint256 i = 0; i < users.length; i++) {
      tokensCount[users[i]][tokenType] += counts[i];
    }
  }

// Operator can toggle the claim mechanism as On / Off
  function toggleClaim() external onlyOperator {
    claimState = !claimState;
  }
// Operator can toggle the purchasing mechanism as On / Off for the Sale of Legionnaires
  function togglePurchase() external onlyOperator {
    purchaseState = !purchaseState;
  }

// Returns a Random Legionnaire from the set of Random Legionniares 
  function popRandomTokenURI() internal returns(string memory) {
    // leftOverUris === unpurchased / unclaimed Legionnaires 
    uint256 randomIndex = getRandomIndex(leftoverUris.length);
    string memory tokenURI = leftoverUris[randomIndex];
    leftoverUris[randomIndex] = leftoverUris[leftoverUris.length - 1];
    leftoverUris.pop();
    return tokenURI;
  }

  // A secure function for Claiming Legionnaires on a specific window of time dependant on the presale token the user has. 
  function claim(uint256 claimedCount) external nonReentrant {
    require(claimState, "Claim is disabled");
    require(block.timestamp >= _activeDateTime, "Presale not start yet");
    
    uint8 genesisTokenCount = tokensCount[msg.sender]['genesis'];
    uint8 platinumTokenCount = tokensCount[msg.sender]['platinum'];
    uint8 goldTokenCount = tokensCount[msg.sender]['gold'];
    uint8 silverTokenCount = tokensCount[msg.sender]['silver'];

    uint256 passedDays = NumberHelper.daysSince(_activeDateTime, INTERVAL);

    uint256 totalCount = genesisTokenCount;
    if (passedDays >= 1) {
        totalCount += platinumTokenCount;
    }
    if (passedDays >= 2) {
        totalCount += goldTokenCount;
    }
    if (passedDays >= 3) {
        totalCount += silverTokenCount;
    }

    uint256 minCount = NumberHelper.min(totalCount, claimedCount);
    require(_claimSV + minCount <= 3301, "No legionnaires left for presale");

    uint256 i = 0;
    uint256 tokenId;
    string memory tokenURI;

    while(i < minCount) {
      if(genesisTokenCount > 0) {
        genesisTokenCount--;
      } else if (passedDays >= 1 && platinumTokenCount > 0) {
        platinumTokenCount--;
      } else if (passedDays >= 2 && goldTokenCount > 0) {
        goldTokenCount--;
      } else if (passedDays >= 3 && silverTokenCount > 0) {
        silverTokenCount--;
      }

      if(revealState) {
        tokenURI = popRandomTokenURI();
      }

      tokenId = _claimSV;
      _claimSV++;
      
      legionnaire.safeMint(msg.sender, tokenId);
      if(!revealState) {
        legionnaire.setTokenURI(tokenId, "placeholder");
      } else {
        legionnaire.setTokenURI(tokenId, tokenURI);
      }
      i++;
    }

    tokensCount[msg.sender]['genesis'] = genesisTokenCount;
    tokensCount[msg.sender]['platinum'] = platinumTokenCount;
    tokensCount[msg.sender]['gold'] = goldTokenCount;
    tokensCount[msg.sender]['silver'] = silverTokenCount;
  }

  
// A secure function to purchase a Legionnaire 
  function purchase(uint256 count) external payable nonReentrant {
    require(purchaseState, "Purchase is disabled");
    require(block.timestamp >= _activeDateTime, "Sale not start yet");
    uint256 passedDays = NumberHelper.daysSince(_activeDateTime, INTERVAL);
    require(passedDays > 3, "Public sale not start yet");
    require(msg.value >= count * .1 ether, "Not enough ether");
    
    uint256 limit; 
    if(passedDays < 5) {
      limit = purchasedSoFar[msg.sender];
      require(count + limit > 0 && count + limit < 3, "Not allowed to purchase that amount");
      purchasedSoFar[msg.sender] += uint8(count);
     // on Day 5 you can only purchase up to 10 / transaction 
    } else if (passedDays < 6) {
      require(count < 11, "Up to 10 only");
    }

    limit = count;
    require(_purchaseSV + limit <= SV_MAX + 1, "No legionnaires left for public sale");

    uint256 tokenId;
    string memory tokenURI;


    for (uint256 i = 0; i < limit; i++) {
      if(revealState) {
        tokenURI = popRandomTokenURI();
      }

      tokenId = _purchaseSV;
      _purchaseSV++;
    
      legionnaire.safeMint(msg.sender, tokenId);
      if(!revealState) {
        legionnaire.setTokenURI(tokenId, "placeholder");
      } else {
        legionnaire.setTokenURI(tokenId, tokenURI);
      }
    }

    (bool sent, ) = svEthAddr.call{ value: limit * .1 ether }("");
    require(sent, "Failed to send Ether");

    if(msg.value > count * .1 ether) {
      (sent, ) = payable(msg.sender).call{ value: msg.value - limit * .1 ether }("");
      require(sent, "Failed to send change back to user");
    }
  }

// Operator can set the start time in UNIX stamp for the claim and sale period 
  function setActiveDateTime(uint256 activeDateTime) external onlyOperator {
    _activeDateTime = activeDateTime;
  }


// Operator pushes the set of remaining unclaimed legionnaires going into self-reveal phase
  function pushLeftOverUris(string[] memory leftoverUris_) external onlyOperator {
    require(!revealState, "Self-Reveal already begun");

    for(uint256 i = 0; i < leftoverUris_.length; i++) {
      leftoverUris.push(leftoverUris_[i]);
    }
  }

  // Returns the left over URIs array length
  function getLeftOverUrisLength() public view returns(uint256) {
    return leftoverUris.length;
  }

/*
*
* A function for the Operator to start the period of time for the user to reveal the URI upon mint
*
*/  
  function beginSelfRevealPeriod() external onlyOperator {
    revealState = true;
  }
   
   // A Random Index between zero and range leveraging VRF 
  
  function getRandomIndex(uint256 range) internal returns(uint256) {
    randNonce++;
    return uint256(keccak256(abi.encodePacked(block.timestamp, msg.sender, randNonce, randomNess))) % range;
  }

// Operator can batch mint and trasnfer remaining Legionnaires to a secure address

  function safeBatchMintAndTransfer(address holder, bool isSetUri, uint16 batchSize) external onlyOperator {
    require(revealState, "Have to begin Self-Reveal");
    require(_purchaseSV + batchSize <= SV_MAX + 1, "No legionnaires left for public sale");

    for(uint256 i = _purchaseSV; i < _purchaseSV + batchSize; i++) {
      legionnaire.safeMint(holder, i);
      if(isSetUri) {
        legionnaire.setTokenURI(i, "placeholder");
      }
    }

    _purchaseSV = uint16(_purchaseSV + batchSize);
  }

 // URISetter will call this to randomly pair URIs with NFT Metadata to tokens.
  function pairLegionnairesWithUris(uint16[] memory _tokenIds, string[] memory _tokenURIs) external onlyURISetter {
    require(_tokenIds.length == _tokenURIs.length, "Mismatched ids and URIs");
    require(_tokenIds.length > 0, "Empty parameters");

    while(_tokenIds.length > 0) {
      uint256 length = _tokenIds.length;
      uint256 randomIndex = getRandomIndex(length);
      legionnaire.setTokenURI(_tokenIds[length - 1], _tokenURIs[randomIndex]);
      _tokenURIs[randomIndex] = _tokenURIs[length - 1];
      delete _tokenIds[length - 1];
      delete _tokenURIs[length - 1];

      assembly { mstore(_tokenIds, sub(mload(_tokenIds), 1)) }
      assembly { mstore(_tokenURIs, sub(mload(_tokenURIs), 1)) }
    }
  }

 // Function saves the random nonce from VRF into the contract 
  function fulfillRandomness(bytes32 _requestId, uint256 _randomness) internal override {
    if(requestId == _requestId) {
      randomNess = _randomness;
    }
  }

 // Owner can decrease the total supply not ever exceeding 10,000 Legionnaires
  function setMaxLimit(uint256 maxLimit) external onlyOwner {
    require(maxLimit < 10001, "Exceed max limit 10000");
    SV_MAX = maxLimit;
  }

 // Operator Calls to VRF for a random nonce
  function requestRandomToVRF() external onlyOperator {
    require(LINK.balanceOf(address(this)) >= fee, "Not enough LINK");
    requestId = requestRandomness(keyHash, fee);
  }
}

// File: @chainlink/contracts/src/v0.8/VRFConsumerBase.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./interfaces/LinkTokenInterface.sol";

import "./VRFRequestIDBase.sol";

/** ****************************************************************************
 * @notice Interface for contracts using VRF randomness
 * *****************************************************************************
 * @dev PURPOSE
 *
 * @dev Reggie the Random Oracle (not his real job) wants to provide randomness
 * @dev to Vera the verifier in such a way that Vera can be sure he's not
 * @dev making his output up to suit himself. Reggie provides Vera a public key
 * @dev to which he knows the secret key. Each time Vera provides a seed to
 * @dev Reggie, he gives back a value which is computed completely
 * @dev deterministically from the seed and the secret key.
 *
 * @dev Reggie provides a proof by which Vera can verify that the output was
 * @dev correctly computed once Reggie tells it to her, but without that proof,
 * @dev the output is indistinguishable to her from a uniform random sample
 * @dev from the output space.
 *
 * @dev The purpose of this contract is to make it easy for unrelated contracts
 * @dev to talk to Vera the verifier about the work Reggie is doing, to provide
 * @dev simple access to a verifiable source of randomness.
 * *****************************************************************************
 * @dev USAGE
 *
 * @dev Calling contracts must inherit from VRFConsumerBase, and can
 * @dev initialize VRFConsumerBase's attributes in their constructor as
 * @dev shown:
 *
 * @dev   contract VRFConsumer {
 * @dev     constuctor(<other arguments>, address _vrfCoordinator, address _link)
 * @dev       VRFConsumerBase(_vrfCoordinator, _link) public {
 * @dev         <initialization with other arguments goes here>
 * @dev       }
 * @dev   }
 *
 * @dev The oracle will have given you an ID for the VRF keypair they have
 * @dev committed to (let's call it keyHash), and have told you the minimum LINK
 * @dev price for VRF service. Make sure your contract has sufficient LINK, and
 * @dev call requestRandomness(keyHash, fee, seed), where seed is the input you
 * @dev want to generate randomness from.
 *
 * @dev Once the VRFCoordinator has received and validated the oracle's response
 * @dev to your request, it will call your contract's fulfillRandomness method.
 *
 * @dev The randomness argument to fulfillRandomness is the actual random value
 * @dev generated from your seed.
 *
 * @dev The requestId argument is generated from the keyHash and the seed by
 * @dev makeRequestId(keyHash, seed). If your contract could have concurrent
 * @dev requests open, you can use the requestId to track which seed is
 * @dev associated with which randomness. See VRFRequestIDBase.sol for more
 * @dev details. (See "SECURITY CONSIDERATIONS" for principles to keep in mind,
 * @dev if your contract could have multiple requests in flight simultaneously.)
 *
 * @dev Colliding `requestId`s are cryptographically impossible as long as seeds
 * @dev differ. (Which is critical to making unpredictable randomness! See the
 * @dev next section.)
 *
 * *****************************************************************************
 * @dev SECURITY CONSIDERATIONS
 *
 * @dev A method with the ability to call your fulfillRandomness method directly
 * @dev could spoof a VRF response with any random value, so it's critical that
 * @dev it cannot be directly called by anything other than this base contract
 * @dev (specifically, by the VRFConsumerBase.rawFulfillRandomness method).
 *
 * @dev For your users to trust that your contract's random behavior is free
 * @dev from malicious interference, it's best if you can write it so that all
 * @dev behaviors implied by a VRF response are executed *during* your
 * @dev fulfillRandomness method. If your contract must store the response (or
 * @dev anything derived from it) and use it later, you must ensure that any
 * @dev user-significant behavior which depends on that stored value cannot be
 * @dev manipulated by a subsequent VRF request.
 *
 * @dev Similarly, both miners and the VRF oracle itself have some influence
 * @dev over the order in which VRF responses appear on the blockchain, so if
 * @dev your contract could have multiple VRF requests in flight simultaneously,
 * @dev you must ensure that the order in which the VRF responses arrive cannot
 * @dev be used to manipulate your contract's user-significant behavior.
 *
 * @dev Since the ultimate input to the VRF is mixed with the block hash of the
 * @dev block in which the request is made, user-provided seeds have no impact
 * @dev on its economic security properties. They are only included for API
 * @dev compatability with previous versions of this contract.
 *
 * @dev Since the block hash of the block which contains the requestRandomness
 * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful
 * @dev miner could, in principle, fork the blockchain to evict the block
 * @dev containing the request, forcing the request to be included in a
 * @dev different block with a different hash, and therefore a different input
 * @dev to the VRF. However, such an attack would incur a substantial economic
 * @dev cost. This cost scales with the number of blocks the VRF oracle waits
 * @dev until it calls responds to a request.
 */
abstract contract VRFConsumerBase is VRFRequestIDBase {

  /**
   * @notice fulfillRandomness handles the VRF response. Your contract must
   * @notice implement it. See "SECURITY CONSIDERATIONS" above for important
   * @notice principles to keep in mind when implementing your fulfillRandomness
   * @notice method.
   *
   * @dev VRFConsumerBase expects its subcontracts to have a method with this
   * @dev signature, and will call it once it has verified the proof
   * @dev associated with the randomness. (It is triggered via a call to
   * @dev rawFulfillRandomness, below.)
   *
   * @param requestId The Id initially returned by requestRandomness
   * @param randomness the VRF output
   */
  function fulfillRandomness(
    bytes32 requestId,
    uint256 randomness
  )
    internal
    virtual;

  /**
   * @dev In order to keep backwards compatibility we have kept the user
   * seed field around. We remove the use of it because given that the blockhash
   * enters later, it overrides whatever randomness the used seed provides.
   * Given that it adds no security, and can easily lead to misunderstandings,
   * we have removed it from usage and can now provide a simpler API.
   */
  uint256 constant private USER_SEED_PLACEHOLDER = 0;

  /**
   * @notice requestRandomness initiates a request for VRF output given _seed
   *
   * @dev The fulfillRandomness method receives the output, once it's provided
   * @dev by the Oracle, and verified by the vrfCoordinator.
   *
   * @dev The _keyHash must already be registered with the VRFCoordinator, and
   * @dev the _fee must exceed the fee specified during registration of the
   * @dev _keyHash.
   *
   * @dev The _seed parameter is vestigial, and is kept only for API
   * @dev compatibility with older versions. It can't *hurt* to mix in some of
   * @dev your own randomness, here, but it's not necessary because the VRF
   * @dev oracle will mix the hash of the block containing your request into the
   * @dev VRF seed it ultimately uses.
   *
   * @param _keyHash ID of public key against which randomness is generated
   * @param _fee The amount of LINK to send with the request
   *
   * @return requestId unique ID for this request
   *
   * @dev The returned requestId can be used to distinguish responses to
   * @dev concurrent requests. It is passed as the first argument to
   * @dev fulfillRandomness.
   */
  function requestRandomness(
    bytes32 _keyHash,
    uint256 _fee
  )
    internal
    returns (
      bytes32 requestId
    )
  {
    LINK.transferAndCall(vrfCoordinator, _fee, abi.encode(_keyHash, USER_SEED_PLACEHOLDER));
    // This is the seed passed to VRFCoordinator. The oracle will mix this with
    // the hash of the block containing this request to obtain the seed/input
    // which is finally passed to the VRF cryptographic machinery.
    uint256 vRFSeed  = makeVRFInputSeed(_keyHash, USER_SEED_PLACEHOLDER, address(this), nonces[_keyHash]);
    // nonces[_keyHash] must stay in sync with
    // VRFCoordinator.nonces[_keyHash][this], which was incremented by the above
    // successful LINK.transferAndCall (in VRFCoordinator.randomnessRequest).
    // This provides protection against the user repeating their input seed,
    // which would result in a predictable/duplicate output, if multiple such
    // requests appeared in the same block.
    nonces[_keyHash] = nonces[_keyHash] + 1;
    return makeRequestId(_keyHash, vRFSeed);
  }

  LinkTokenInterface immutable internal LINK;
  address immutable private vrfCoordinator;

  // Nonces for each VRF key from which randomness has been requested.
  //
  // Must stay in sync with VRFCoordinator[_keyHash][this]
  mapping(bytes32 /* keyHash */ => uint256 /* nonce */) private nonces;

  /**
   * @param _vrfCoordinator address of VRFCoordinator contract
   * @param _link address of LINK token contract
   *
   * @dev https://docs.chain.link/docs/link-token-contracts
   */
  constructor(
    address _vrfCoordinator,
    address _link
  ) {
    vrfCoordinator = _vrfCoordinator;
    LINK = LinkTokenInterface(_link);
  }

  // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF
  // proof. rawFulfillRandomness then calls fulfillRandomness, after validating
  // the origin of the call
  function rawFulfillRandomness(
    bytes32 requestId,
    uint256 randomness
  )
    external
  {
    require(msg.sender == vrfCoordinator, "Only VRFCoordinator can fulfill");
    fulfillRandomness(requestId, randomness);
  }
}

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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].
 */
abstract 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() {
        _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;
    }
}

// File: contracts/interfaces/ILegionnaire.sol



//SPDX-License-Identifier: GNU General Public License v3.0
pragma solidity ^0.8.0;

// Interface for Legionnaire token
interface ILegionnaire {
  
  function safeMint(address to, uint256 tokenId) external;

  function setTokenURI(uint256 tokenId, string memory _tokenURI) external;
}

// File: contracts/utils/Operatorable.sol



//SPDX-License-Identifier: GNU General Public License v3.0
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";

contract Operatorable is Ownable, AccessControl {
  bytes32 public constant OPERATOR_ROLE = keccak256("OPERATOR_ROLE");
  bytes32 public constant URI_SETTER_ROLE = keccak256("URI_SETTER_ROLE");

  /**
    * @dev Restricted to members of the `operator` role.
    */
  modifier onlyOperator() {
    require(hasRole(OPERATOR_ROLE, msg.sender), "Operatorable: CALLER_NO_OPERATOR_ROLE");
    _;
  }

  modifier onlyURISetter() {
    require(hasRole(URI_SETTER_ROLE, msg.sender), "Settable: CALLER_NO_URI_SETTER_ROLE");
    _;
  }

  constructor() {
    _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
    _setupRole(OPERATOR_ROLE, msg.sender);
    _setupRole(URI_SETTER_ROLE, msg.sender);
  }

  /**
    * @dev Add an `_account` to the `operator` role.
    */
  function addOperator(address _account) public onlyOwner {
    grantRole(OPERATOR_ROLE, _account);
  }

  /**
    * @dev Remove an `_account` from the `operator` role.
    */
  function removeOperator(address _account) public onlyOwner {
    revokeRole(OPERATOR_ROLE, _account);
  }

  function addURISetter(address _account) public onlyOwner {
    grantRole(URI_SETTER_ROLE, _account);
  }

  function removeURISetter(address _account) public onlyOwner {
    revokeRole(URI_SETTER_ROLE, _account);
  }

  /**
    * @dev Check if an _account is operator.
    */
  function isOperator(address _account) public view returns (bool) {
    return hasRole(OPERATOR_ROLE, _account);
  }

  /**
    * @dev Check if an _account is operator.
    */
  function isURISetter(address _account) public view returns (bool) {
    return hasRole(URI_SETTER_ROLE, _account);
  }
}

// File: contracts/helpers/NumberHelper.sol



//SPDX-License-Identifier: GNU General Public License v3.0
pragma solidity ^0.8.0;

library NumberHelper {
  function min(uint a, uint b) internal pure returns (uint) {
    return a < b ? a : b;
  }

  function daysSince(uint256 _activeDateTime, uint256 _interval) internal view returns (uint256) {
    unchecked {
      uint256 passedTime = (block.timestamp - _activeDateTime) / _interval;
      if( passedTime < 24) {
        return 1;
      } else if( passedTime < 48 ) {
        return 2;
      } else if( passedTime < 72 ) {
        return 3;
      } else if( passedTime < 96 ) {
        return 4;
      } else if( passedTime < 120 ) {
        return 5;
      } else if( passedTime < 144 ) {
        return 6;
      } else if( passedTime < 168 ) {
        return 7;
      } else {
        return 8;
      }
    }
  }
}

// File: @chainlink/contracts/src/v0.8/interfaces/LinkTokenInterface.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface LinkTokenInterface {

  function allowance(
    address owner,
    address spender
  )
    external
    view
    returns (
      uint256 remaining
    );

  function approve(
    address spender,
    uint256 value
  )
    external
    returns (
      bool success
    );

  function balanceOf(
    address owner
  )
    external
    view
    returns (
      uint256 balance
    );

  function decimals()
    external
    view
    returns (
      uint8 decimalPlaces
    );

  function decreaseApproval(
    address spender,
    uint256 addedValue
  )
    external
    returns (
      bool success
    );

  function increaseApproval(
    address spender,
    uint256 subtractedValue
  ) external;

  function name()
    external
    view
    returns (
      string memory tokenName
    );

  function symbol()
    external
    view
    returns (
      string memory tokenSymbol
    );

  function totalSupply()
    external
    view
    returns (
      uint256 totalTokensIssued
    );

  function transfer(
    address to,
    uint256 value
  )
    external
    returns (
      bool success
    );

  function transferAndCall(
    address to,
    uint256 value,
    bytes calldata data
  )
    external
    returns (
      bool success
    );

  function transferFrom(
    address from,
    address to,
    uint256 value
  )
    external
    returns (
      bool success
    );

}

// File: @chainlink/contracts/src/v0.8/VRFRequestIDBase.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract VRFRequestIDBase {

  /**
   * @notice returns the seed which is actually input to the VRF coordinator
   *
   * @dev To prevent repetition of VRF output due to repetition of the
   * @dev user-supplied seed, that seed is combined in a hash with the
   * @dev user-specific nonce, and the address of the consuming contract. The
   * @dev risk of repetition is mostly mitigated by inclusion of a blockhash in
   * @dev the final seed, but the nonce does protect against repetition in
   * @dev requests which are included in a single block.
   *
   * @param _userSeed VRF seed input provided by user
   * @param _requester Address of the requesting contract
   * @param _nonce User-specific nonce at the time of the request
   */
  function makeVRFInputSeed(
    bytes32 _keyHash,
    uint256 _userSeed,
    address _requester,
    uint256 _nonce
  )
    internal
    pure
    returns (
      uint256
    )
  {
    return uint256(keccak256(abi.encode(_keyHash, _userSeed, _requester, _nonce)));
  }

  /**
   * @notice Returns the id for this request
   * @param _keyHash The serviceAgreement ID to be used for this request
   * @param _vRFInputSeed The seed to be passed directly to the VRF
   * @return The id for this request
   *
   * @dev Note that _vRFInputSeed is not the seed passed by the consuming
   * @dev contract, but the one generated by makeVRFInputSeed
   */
  function makeRequestId(
    bytes32 _keyHash,
    uint256 _vRFInputSeed
  )
    internal
    pure
    returns (
      bytes32
    )
  {
    return keccak256(abi.encodePacked(_keyHash, _vRFInputSeed));
  }
}
// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }

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

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

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



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role, _msgSender());
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(uint160(account), 20),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    function _grantRole(bytes32 role, address account) private {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    function _revokeRole(bytes32 role, address account) private {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

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



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

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



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

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



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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