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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

contract Access is Ownable, ReentrancyGuard {
  
  event Trade(
    address trader, 
    address subject, 
    address application,
    bool    isBuy, 
    uint256 keyAmount, 
    uint256 ethAmount, 
    uint256 protocolEthAmount, 
    uint256 subjectEthAmount,
    uint256 applicationEthAmount,
    uint256 supply
  );
  
  address public protocolFeeDestination;
  mapping (address => address) public subjectFeeDestination;

  uint256 public protocolFeePercent;
  uint256 public subjectFeePercent;
  uint256 public applicationFeePercent;
  uint256 public FEE_DENOMINATOR = 10000;

  constructor(address protocolFeeDestination_) {
    protocolFeePercent = 30; // 0.3%
    subjectFeePercent = 650; // 6.5%
    applicationFeePercent = 320; // 3.2%
    protocolFeeDestination = protocolFeeDestination_;
  }

  // KeysSubject => (Holder => Balance)
  mapping(address => mapping(address => uint256)) public keysBalance;

  // KeysSubject => Supply
  mapping(address => uint256) public keysSupply;

  function setFeeDestination(address _feeDestination) public onlyOwner {
    require(_feeDestination != address(0));
    protocolFeeDestination = _feeDestination;
  }

  function setSubjectFeeDestination(address _feeDestination) public {
    require(_feeDestination != address(0));
    subjectFeeDestination[msg.sender] = _feeDestination;
  }

  function setProtocolFeePercent(uint256 _feePercent) public onlyOwner {
    require(_feePercent <= 50); // max 0.5% (50/10000)
    protocolFeePercent = _feePercent;
  }

  function setSubjectFeePercent(uint256 _feePercent) public onlyOwner {
    require(_feePercent <= 650); // max 6.5% (650/10000)
    subjectFeePercent = _feePercent;
  }

  function setApplicationFeePercent(uint256 _feePercent) public onlyOwner {
    require(_feePercent <= 350); // max 3.5% (350/10000)
    applicationFeePercent = _feePercent; 
  }

  /*
    Academic motivation for "222":

    I hope the next time I move I get a real easy phone number, something that's real easy to remember. Something like 222-2222.
    I would say, "Sweet." And then people would say, "Mitch, how do I get a hold of you?" I'd say, "Just press 2 for a while. 
    And when I answer, you will know you have pressed 2 enough." - Mitch Hedberg
  */

  function getPrice(uint256 supply, uint256 amount) public pure returns (uint256) {
    require(!(supply == 0 && amount > 1), "First purchase can only be for 1."); // > 1 causes underflow in sum2

    uint256 sum1 = supply == 0 ? 0 : (supply - 1 )* (supply) * (2 * (supply - 1) + 1) / 6;
    uint256 sum2 = supply == 0 && amount == 1 ? 0 : (supply - 1 + amount) * (supply + amount) * (2 * (supply - 1 + amount) + 1) / 6;
    uint256 summation = sum2 - sum1;
    
    return summation * 1 ether / 222; 
  }

  function getBuyPrice(address keysSubject, uint256 amount) public view returns (uint256) {
    return getPrice(keysSupply[keysSubject], amount);
  }

  function getSellPrice(address keysSubject, uint256 amount) public view returns (uint256) {
    return getPrice(keysSupply[keysSubject] - amount, amount);
  }

  function getBuyPriceAfterFee(address keysSubject, uint256 amount) public view returns (uint256) {
    uint256 price = getBuyPrice(keysSubject, amount);
    uint256 protocolFee = price * protocolFeePercent / FEE_DENOMINATOR;
    uint256 subjectFee = price * subjectFeePercent / FEE_DENOMINATOR;
    uint256 applicationFee = price * applicationFeePercent / FEE_DENOMINATOR;
    return price + protocolFee + subjectFee + applicationFee;
  }

  function getSellPriceAfterFee(address keysSubject, uint256 amount) public view returns (uint256) {
    uint256 price = getSellPrice(keysSubject, amount);
    uint256 protocolFee = price * protocolFeePercent / FEE_DENOMINATOR;
    uint256 subjectFee = price * subjectFeePercent / FEE_DENOMINATOR;
    uint256 applicationFee = price * applicationFeePercent / FEE_DENOMINATOR;
    return price - protocolFee - subjectFee - applicationFee;
  }

  function buyKeys(address application, address keysSubject, uint256 amount) public payable nonReentrant {
    require(application != address(0), "Application cannot be null.");
    require(protocolFeeDestination != address(0), "Protocol cannot be null.");
    require(amount > 0, "Amount cannot be zero.");

    uint256 supply = keysSupply[keysSubject];
    require(supply > 0 || keysSubject == msg.sender, "Only the keys' subject can buy the first key.");
    
    uint256 price = getPrice(supply, amount);
    uint256 protocolFee = price * protocolFeePercent / FEE_DENOMINATOR;
    uint256 subjectFee = price * subjectFeePercent / FEE_DENOMINATOR;
    uint256 applicationFee = price * applicationFeePercent / FEE_DENOMINATOR;
    
    require(msg.value >= price + protocolFee + subjectFee + applicationFee, "Insufficient payment.");
    
    keysBalance[keysSubject][msg.sender] = keysBalance[keysSubject][msg.sender] + amount;
    keysSupply[keysSubject] = supply + amount;

    emit Trade(
      msg.sender,     // address  trader
      keysSubject,    // address  subject
      application,    // address  application
      true,           // bool     isBuy
      amount,         // uint256  keyAmount
      price,          // uint256  ethAmount
      protocolFee,    // uint256  protocolEthAmount
      subjectFee,     // uint256  subjectEthAmount
      applicationFee, // uint256  applicationEthAmount
      supply + amount // uint256  supply
    );

    transferFunds(protocolFeeDestination, protocolFee);
    transferFunds(application, applicationFee);
    transferFunds(getSubjectFeeDestination(keysSubject), subjectFee);

    uint256 remainder = msg.value - (price + protocolFee + subjectFee + applicationFee);

    if (remainder > 0) {
      transferFunds(msg.sender, remainder);
    }
  }

  function sellKeys(address application, address keysSubject, uint256 amount) public nonReentrant {
    uint256 supply = keysSupply[keysSubject];
    require(supply > amount, "Cannot sell the last key.");

    require(application != address(0), "Application cannot be null.");
    require(protocolFeeDestination != address(0), "Protocol cannot be null.");
    require(amount > 0, "Amount cannot be zero.");

    uint256 price = getPrice(supply - amount, amount);
    uint256 protocolFee = price * protocolFeePercent / FEE_DENOMINATOR;
    uint256 applicationFee = price * applicationFeePercent / FEE_DENOMINATOR;
    uint256 subjectFee = price * subjectFeePercent / FEE_DENOMINATOR;

    require(keysBalance[keysSubject][msg.sender] >= amount, "Insufficient keys.");

    keysBalance[keysSubject][msg.sender] = keysBalance[keysSubject][msg.sender] - amount;
    keysSupply[keysSubject] = supply - amount;

    emit Trade(
      msg.sender,     // address  trader
      keysSubject,    // address  subject
      application,    // address  application
      false,          // bool     isBuy
      amount,         // uint256  keyAmount
      price,          // uint256  ethAmount
      protocolFee,    // uint256  protocolEthAmount
      subjectFee,     // uint256  subjectEthAmount
      applicationFee, // uint256  applicationEthAmount
      supply - amount // uint256  supply
    );

    transferFunds(protocolFeeDestination, protocolFee);
    transferFunds(application, applicationFee);
    transferFunds(getSubjectFeeDestination(keysSubject), subjectFee);
    transferFunds(msg.sender, price - protocolFee - subjectFee - applicationFee);
  }

  function transferFunds(address recipient, uint256 amount) private {
    (bool success,) = recipient.call{value: amount}("");
    require(success, "Failed to transfer funds.");
  }

  function getSubjectFeeDestination(address subject) private view returns (address) {
    address subjectFeeDest = subject;
    if (subjectFeeDestination[subject] != address(0)) {
      subjectFeeDest = subjectFeeDestination[subject];
    }
    return subjectFeeDest;
  }
}

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

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

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 making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

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

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

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

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

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

{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "london",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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00000000000000000000000091fd9ee7a7947c66dd80eeba403714d81a6930a9

-----Decoded View---------------
Arg [0] : protocolFeeDestination_ (address): 0x91fD9Ee7a7947c66dd80eebA403714d81A6930a9

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000091fd9ee7a7947c66dd80eeba403714d81a6930a9