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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.16;

import "@openzeppelin/contracts-upgradeable/interfaces/IERC721Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/interfaces/IERC721ReceiverUpgradeable.sol";

import {Context} from "../../../cake/Context.sol";
import {Base} from "../../../cake/Base.sol";
import "../../../cake/Routing.sol" as Routing;

import {Arrays} from "../../../library/Arrays.sol";
import {CapitalAssets} from "./assets/CapitalAssets.sol";
import {UserEpochTotals, UserEpochTotal} from "./UserEpochTotals.sol";

import {ICapitalLedger, CapitalAssetType} from "../../../interfaces/ICapitalLedger.sol";

using Routing.Context for Context;
using UserEpochTotals for UserEpochTotal;
using Arrays for uint256[];

/**
 * @title CapitalLedger
 * @notice Track Capital held by owners and ensure the Capital has been accounted for.
 * @author Goldfinch
 */
contract CapitalLedger is ICapitalLedger, Base, IERC721ReceiverUpgradeable {
  /// Thrown when attempting to deposit nothing
  error ZeroDeposit();
  /// Thrown when withdrawing an invalid amount for a position
  error InvalidWithdrawAmount(uint256 requested, uint256 max);
  /// Thrown when depositing from address(0)
  error InvalidOwnerIndex();
  /// Thrown when querying token supply with an index greater than the supply
  error IndexGreaterThanTokenSupply();

  struct Position {
    // Owner of the position
    address owner;
    // Index of the position in the ownership array
    uint256 ownedIndex;
    // Address of the underlying asset represented by the position
    address assetAddress;
    // USDC equivalent value of the position. This is first written
    // on position deposit but may be updated on harvesting or kicking
    uint256 usdcEquivalent;
    // When the position was deposited
    uint256 depositTimestamp;
  }

  struct ERC721Data {
    // Id of the ERC721 assetAddress' token
    uint256 assetTokenId;
  }

  /// Data for positions in the vault. Always has a corresponding
  /// entry at the same index in ERC20Data or ERC721 data, but never
  /// both.
  mapping(uint256 => Position) public positions;

  // Which positions an address owns
  mapping(address => uint256[]) private owners;

  /// Total held by each user, while being aware of the deposit epoch
  mapping(address => UserEpochTotal) private totals;

  // The current position index
  uint256 private positionCounter;

  /// ERC721 data corresponding to positions, data has the same index
  /// as its corresponding position.
  mapping(uint256 => ERC721Data) private erc721Datas;

  /// @notice Construct the contract
  constructor(Context _context) Base(_context) {}

  /// @inheritdoc ICapitalLedger
  function depositERC721(
    address owner,
    address assetAddress,
    uint256 assetTokenId
  ) external onlyOperator(Routing.Keys.MembershipOrchestrator) returns (uint256) {
    if (CapitalAssets.getSupportedType(context, assetAddress) != CapitalAssetType.ERC721) {
      revert CapitalAssets.InvalidAsset(assetAddress);
    }
    if (!CapitalAssets.isValid(context, assetAddress, assetTokenId)) {
      revert CapitalAssets.InvalidAssetWithId(assetAddress, assetTokenId);
    }

    IERC721Upgradeable asset = IERC721Upgradeable(assetAddress);
    uint256 usdcEquivalent = CapitalAssets.getUsdcEquivalent(context, asset, assetTokenId);
    uint256 positionId = _mintPosition(owner, assetAddress, usdcEquivalent);

    erc721Datas[positionId] = ERC721Data({assetTokenId: assetTokenId});

    totals[owner].recordIncrease(usdcEquivalent);

    asset.safeTransferFrom(address(context.membershipOrchestrator()), address(this), assetTokenId);

    emit CapitalERC721Deposit({
      owner: owner,
      assetAddress: assetAddress,
      positionId: positionId,
      assetTokenId: assetTokenId,
      usdcEquivalent: usdcEquivalent
    });

    return positionId;
  }

  /// @inheritdoc ICapitalLedger
  function erc721IdOf(uint256 positionId) public view returns (uint256) {
    return erc721Datas[positionId].assetTokenId;
  }

  /// @inheritdoc ICapitalLedger
  function withdraw(uint256 positionId) external onlyOperator(Routing.Keys.MembershipOrchestrator) {
    Position memory position = positions[positionId];
    delete positions[positionId];

    CapitalAssetType assetType = CapitalAssets.getSupportedType(context, position.assetAddress);

    totals[position.owner].recordDecrease(position.usdcEquivalent, position.depositTimestamp);

    uint256[] storage ownersList = owners[position.owner];
    (, bool replaced) = ownersList.reorderingRemove(position.ownedIndex);
    if (replaced) {
      positions[ownersList[position.ownedIndex]].ownedIndex = position.ownedIndex;
    }

    if (assetType == CapitalAssetType.ERC721) {
      uint256 assetTokenId = erc721Datas[positionId].assetTokenId;
      delete erc721Datas[positionId];

      IERC721Upgradeable(position.assetAddress).safeTransferFrom(
        address(this),
        position.owner,
        assetTokenId
      );

      emit CapitalERC721Withdrawal(
        position.owner,
        positionId,
        position.assetAddress,
        position.depositTimestamp
      );
    } else {
      revert InvalidAssetType(assetType);
    }
  }

  /// @inheritdoc ICapitalLedger
  function harvest(uint256 positionId) external onlyOperator(Routing.Keys.MembershipOrchestrator) {
    Position memory position = positions[positionId];
    CapitalAssetType assetType = CapitalAssets.getSupportedType(context, position.assetAddress);

    if (assetType != CapitalAssetType.ERC721) revert InvalidAssetType(assetType);

    CapitalAssets.harvest(
      context,
      position.owner,
      IERC721Upgradeable(position.assetAddress),
      erc721Datas[positionId].assetTokenId
    );

    emit CapitalERC721Harvest({positionId: positionId, assetAddress: position.assetAddress});

    _kick(positionId);
  }

  /// @inheritdoc ICapitalLedger
  function assetAddressOf(uint256 positionId) public view returns (address) {
    return positions[positionId].assetAddress;
  }

  /// @inheritdoc ICapitalLedger
  function ownerOf(uint256 positionId) public view returns (address) {
    return positions[positionId].owner;
  }

  /// @inheritdoc ICapitalLedger
  function totalsOf(
    address addr
  ) external view returns (uint256 eligibleAmount, uint256 totalAmount) {
    return totals[addr].getTotals();
  }

  /// @inheritdoc ICapitalLedger
  function totalSupply() public view returns (uint256) {
    return positionCounter;
  }

  /// @inheritdoc ICapitalLedger
  function balanceOf(address addr) external view returns (uint256) {
    return owners[addr].length;
  }

  /// @inheritdoc ICapitalLedger
  function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256) {
    if (index >= owners[owner].length) revert InvalidOwnerIndex();

    return owners[owner][index];
  }

  /// @inheritdoc ICapitalLedger
  function tokenByIndex(uint256 index) external view returns (uint256) {
    if (index >= totalSupply()) revert IndexGreaterThanTokenSupply();

    return index + 1;
  }

  /// @inheritdoc IERC721ReceiverUpgradeable
  function onERC721Received(
    address,
    address,
    uint256,
    bytes calldata
  ) external pure returns (bytes4) {
    return IERC721ReceiverUpgradeable.onERC721Received.selector;
  }

  //////////////////////////////////////////////////////////////////
  // Private

  function _mintPosition(
    address owner,
    address assetAddress,
    uint256 usdcEquivalent
  ) private returns (uint256 positionId) {
    positionCounter++;

    positionId = positionCounter;
    positions[positionId] = Position({
      owner: owner,
      ownedIndex: owners[owner].length,
      assetAddress: assetAddress,
      usdcEquivalent: usdcEquivalent,
      depositTimestamp: block.timestamp
    });

    owners[owner].push(positionId);
  }

  /**
   * @notice Update the USDC equivalent value of the position, based on the current,
   *  point-in-time valuation of the underlying asset.
   * @param positionId id of the position
   */
  function _kick(uint256 positionId) internal {
    Position memory position = positions[positionId];
    CapitalAssetType assetType = CapitalAssets.getSupportedType(context, position.assetAddress);

    if (assetType != CapitalAssetType.ERC721) revert InvalidAssetType(assetType);

    // Remove the original USDC equivalent value from the owner's total
    totals[position.owner].recordDecrease(position.usdcEquivalent, position.depositTimestamp);

    uint256 usdcEquivalent = CapitalAssets.getUsdcEquivalent(
      context,
      IERC721Upgradeable(position.assetAddress),
      erc721Datas[positionId].assetTokenId
    );

    //  Set the new value & add the new USDC equivalent value back to the owner's total
    positions[positionId].usdcEquivalent = usdcEquivalent;
    totals[position.owner].recordInstantIncrease(usdcEquivalent, position.depositTimestamp);

    emit CapitalPositionAdjustment({
      positionId: positionId,
      assetAddress: position.assetAddress,
      usdcEquivalent: usdcEquivalent
    });
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20Upgradeable.sol";

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../token/ERC721/IERC721ReceiverUpgradeable.sol";

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../token/ERC721/IERC721Upgradeable.sol";

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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 ^0.8.0;

import "../IERC20Upgradeable.sol";
import "../../../utils/AddressUpgradeable.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 SafeERC20Upgradeable {
    using AddressUpgradeable for address;

    function safeTransfer(
        IERC20Upgradeable token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20Upgradeable 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(
        IERC20Upgradeable 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'
        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(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _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(IERC20Upgradeable 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
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721ReceiverUpgradeable {
    /**
     * @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 ^0.8.0;

import "../../utils/introspection/IERC165Upgradeable.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721Upgradeable is IERC165Upgradeable {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @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) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @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");

        (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");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// 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 IERC165Upgradeable {
    /**
     * @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
pragma solidity ^0.8.16;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "../interfaces/IAccessControl.sol";

/// @title Cake access control
/// @author landakram
/// @notice This contact centralizes contract-to-contract access control using a simple
/// access-control list. There are two types of actors: operators and admins. Operators
/// are callers involved in a regular end-user tx. This would likely be another Goldfinch
/// contract for which the current contract is a dependency. Admins are callers allowed
/// for specific admin actions (like changing parameters, topping up funds, etc.).
contract AccessControl is Initializable, IAccessControl {
  /// @dev Mapping from contract address to contract admin;
  mapping(address => address) public admins;

  function initialize(address admin) public initializer {
    admins[address(this)] = admin;
    emit AdminSet(address(this), admin);
  }

  /// @inheritdoc IAccessControl
  function setAdmin(address resource, address admin) external {
    requireSuperAdmin(msg.sender);
    admins[resource] = admin;
    emit AdminSet(resource, admin);
  }

  /// @inheritdoc IAccessControl
  function requireAdmin(address resource, address accessor) public view {
    if (accessor == address(0)) revert ZeroAddress();
    bool isAdmin = admins[resource] == accessor;
    if (!isAdmin) revert RequiresAdmin(resource, accessor);
  }

  /// @inheritdoc IAccessControl
  function requireSuperAdmin(address accessor) public view {
    // The super admin is the admin of this AccessControl contract
    requireAdmin({resource: address(this), accessor: accessor});
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import {Context} from "./Context.sol";
import "./Routing.sol" as Routing;

using Routing.Context for Context;

/// @title Base contract for application-layer
/// @author landakram
/// @notice This base contract is what all application-layer contracts should inherit from.
///  It provides `Context`, as well as some convenience functions for working with it and
///  using access control. All public methods on the inheriting contract should likely
///  use one of the modifiers to assert valid callers.
abstract contract Base {
  error RequiresOperator(address resource, address accessor);
  error ZeroAddress();

  /// @dev this is safe for proxies as immutable causes the context to be written to
  ///  bytecode on deployment. The proxy then treats this as a constant.
  Context immutable context;

  constructor(Context _context) {
    context = _context;
  }

  modifier onlyOperator(bytes4 operatorId) {
    requireOperator(operatorId, msg.sender);
    _;
  }

  modifier onlyOperators(bytes4[2] memory operatorIds) {
    requireAnyOperator(operatorIds, msg.sender);
    _;
  }

  modifier onlyAdmin() {
    context.accessControl().requireAdmin(address(this), msg.sender);
    _;
  }

  function requireAnyOperator(bytes4[2] memory operatorIds, address accessor) private view {
    if (accessor == address(0)) revert ZeroAddress();

    bool validOperator = isOperator(operatorIds[0], accessor) ||
      isOperator(operatorIds[1], accessor);

    if (!validOperator) revert RequiresOperator(address(this), accessor);
  }

  function requireOperator(bytes4 operatorId, address accessor) private view {
    if (accessor == address(0)) revert ZeroAddress();
    if (!isOperator(operatorId, accessor)) revert RequiresOperator(address(this), accessor);
  }

  function isOperator(bytes4 operatorId, address accessor) private view returns (bool) {
    return context.router().contracts(operatorId) == accessor;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import {AccessControl} from "./AccessControl.sol";
import {Router} from "./Router.sol";
import "./Routing.sol" as Routing;

using Routing.Context for Context;

/// @title Entry-point for all application-layer contracts.
/// @author landakram
/// @notice This contract provides an interface for retrieving other contract addresses and doing access
///  control.
contract Context {
  /// @notice Used for retrieving other contract addresses.
  /// @dev This variable is immutable. This is done to save gas, as it is expected to be referenced
  /// in every end-user call with a call-chain length > 0. Note that it is written into the contract
  /// bytecode at contract creation time, so if the contract is deployed as the implementation for proxies,
  /// every proxy will share the same Router address.
  Router public immutable router;

  constructor(Router _router) {
    router = _router;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import {AccessControl} from "./AccessControl.sol";
import {IRouter} from "../interfaces/IRouter.sol";

import "./Routing.sol" as Routing;

/// @title Router
/// @author landakram
/// @notice This contract provides service discovery for contracts using the cake framework.
///   It can be used in conjunction with the convenience methods defined in the `Routing.Context`
///   and `Routing.Keys` libraries.
contract Router is Initializable, IRouter {
  /// @notice Mapping of keys to contract addresses. Keys are the first 4 bytes of the keccak of
  ///   the contract's name. See Routing.sol for all options.
  mapping(bytes4 => address) public contracts;

  function initialize(AccessControl accessControl) public initializer {
    contracts[Routing.Keys.AccessControl] = address(accessControl);
  }

  /// @notice Associate a routing key to a contract address
  /// @dev This function is only callable by the Router admin
  /// @param key A routing key (defined in the `Routing.Keys` libary)
  /// @param addr A contract address
  function setContract(bytes4 key, address addr) public {
    AccessControl accessControl = AccessControl(contracts[Routing.Keys.AccessControl]);
    accessControl.requireAdmin(address(this), msg.sender);
    contracts[key] = addr;
    emit SetContract(key, addr);
  }
}

// SPDX-License-Identifier: MIT
// solhint-disable const-name-snakecase

pragma solidity ^0.8.16;

import "@openzeppelin/contracts-upgradeable/interfaces/IERC20Upgradeable.sol";

import {IMembershipVault} from "../interfaces/IMembershipVault.sol";
import {IGFILedger} from "../interfaces/IGFILedger.sol";
import {ICapitalLedger} from "../interfaces/ICapitalLedger.sol";
import {IMembershipDirector} from "../interfaces/IMembershipDirector.sol";
import {IMembershipOrchestrator} from "../interfaces/IMembershipOrchestrator.sol";
import {IMembershipLedger} from "../interfaces/IMembershipLedger.sol";
import {IMembershipCollector} from "../interfaces/IMembershipCollector.sol";
import {IBackerRewards} from "../interfaces/IBackerRewards.sol";

import {ISeniorPool} from "../interfaces/ISeniorPool.sol";
import {IPoolTokens} from "../interfaces/IPoolTokens.sol";
import {IStakingRewards} from "../interfaces/IStakingRewards.sol";
import {IGo} from "../interfaces/IGo.sol";

import {IERC20Splitter} from "../interfaces/IERC20Splitter.sol";
import {Context as ContextContract} from "./Context.sol";
import {IAccessControl} from "../interfaces/IAccessControl.sol";

/// @title Routing.Keys
/// @notice This library is used to define routing keys used by `Router`.
/// @dev We use uints instead of enums for several reasons. First, keys can be re-ordered
///   or removed. This is useful when routing keys are deprecated; they can be moved to a
///   different section of the file. Second, other libraries or contracts can define their
///   own routing keys independent of this global mapping. This is useful for test contracts.
library Keys {
  // Membership
  bytes4 internal constant MembershipOrchestrator = bytes4(keccak256("MembershipOrchestrator"));
  bytes4 internal constant MembershipDirector = bytes4(keccak256("MembershipDirector"));
  bytes4 internal constant GFILedger = bytes4(keccak256("GFILedger"));
  bytes4 internal constant CapitalLedger = bytes4(keccak256("CapitalLedger"));
  bytes4 internal constant MembershipCollector = bytes4(keccak256("MembershipCollector"));
  bytes4 internal constant MembershipLedger = bytes4(keccak256("MembershipLedger"));
  bytes4 internal constant MembershipVault = bytes4(keccak256("MembershipVault"));

  // Tokens
  bytes4 internal constant GFI = bytes4(keccak256("GFI"));
  bytes4 internal constant FIDU = bytes4(keccak256("FIDU"));
  bytes4 internal constant USDC = bytes4(keccak256("USDC"));

  // Cake
  bytes4 internal constant AccessControl = bytes4(keccak256("AccessControl"));
  bytes4 internal constant Router = bytes4(keccak256("Router"));

  // Core
  bytes4 internal constant ReserveSplitter = bytes4(keccak256("ReserveSplitter"));
  bytes4 internal constant PoolTokens = bytes4(keccak256("PoolTokens"));
  bytes4 internal constant SeniorPool = bytes4(keccak256("SeniorPool"));
  bytes4 internal constant StakingRewards = bytes4(keccak256("StakingRewards"));
  bytes4 internal constant ProtocolAdmin = bytes4(keccak256("ProtocolAdmin"));
  bytes4 internal constant PauserAdmin = bytes4(keccak256("PauserAdmin"));
  bytes4 internal constant BackerRewards = bytes4(keccak256("BackerRewards"));
  bytes4 internal constant Go = bytes4(keccak256("Go"));
}

/// @title Routing.Context
/// @notice This library provides convenience functions for getting contracts from `Router`.
library Context {
  function accessControl(ContextContract context) internal view returns (IAccessControl) {
    return IAccessControl(context.router().contracts(Keys.AccessControl));
  }

  function membershipVault(ContextContract context) internal view returns (IMembershipVault) {
    return IMembershipVault(context.router().contracts(Keys.MembershipVault));
  }

  function capitalLedger(ContextContract context) internal view returns (ICapitalLedger) {
    return ICapitalLedger(context.router().contracts(Keys.CapitalLedger));
  }

  function gfiLedger(ContextContract context) internal view returns (IGFILedger) {
    return IGFILedger(context.router().contracts(Keys.GFILedger));
  }

  function gfi(ContextContract context) internal view returns (IERC20Upgradeable) {
    return IERC20Upgradeable(context.router().contracts(Keys.GFI));
  }

  function membershipDirector(ContextContract context) internal view returns (IMembershipDirector) {
    return IMembershipDirector(context.router().contracts(Keys.MembershipDirector));
  }

  function membershipOrchestrator(
    ContextContract context
  ) internal view returns (IMembershipOrchestrator) {
    return IMembershipOrchestrator(context.router().contracts(Keys.MembershipOrchestrator));
  }

  function stakingRewards(ContextContract context) internal view returns (IStakingRewards) {
    return IStakingRewards(context.router().contracts(Keys.StakingRewards));
  }

  function poolTokens(ContextContract context) internal view returns (IPoolTokens) {
    return IPoolTokens(context.router().contracts(Keys.PoolTokens));
  }

  function seniorPool(ContextContract context) internal view returns (ISeniorPool) {
    return ISeniorPool(context.router().contracts(Keys.SeniorPool));
  }

  function fidu(ContextContract context) internal view returns (IERC20Upgradeable) {
    return IERC20Upgradeable(context.router().contracts(Keys.FIDU));
  }

  function usdc(ContextContract context) internal view returns (IERC20Upgradeable) {
    return IERC20Upgradeable(context.router().contracts(Keys.USDC));
  }

  function reserveSplitter(ContextContract context) internal view returns (IERC20Splitter) {
    return IERC20Splitter(context.router().contracts(Keys.ReserveSplitter));
  }

  function membershipLedger(ContextContract context) internal view returns (IMembershipLedger) {
    return IMembershipLedger(context.router().contracts(Keys.MembershipLedger));
  }

  function membershipCollector(
    ContextContract context
  ) internal view returns (IMembershipCollector) {
    return IMembershipCollector(context.router().contracts(Keys.MembershipCollector));
  }

  function protocolAdmin(ContextContract context) internal view returns (address) {
    return context.router().contracts(Keys.ProtocolAdmin);
  }

  function pauserAdmin(ContextContract context) internal view returns (address) {
    return context.router().contracts(Keys.PauserAdmin);
  }

  function backerRewards(ContextContract context) internal view returns (IBackerRewards) {
    return IBackerRewards(context.router().contracts(Keys.BackerRewards));
  }

  function go(ContextContract context) internal view returns (IGo) {
    return IGo(context.router().contracts(Keys.Go));
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

/// @title Cake access control
/// @author landakram
/// @notice This contact centralizes contract-to-contract access control using a simple
/// access-control list. There are two types of actors: operators and admins. Operators
/// are callers involved in a regular end-user tx. This would likely be another Goldfinch
/// contract for which the current contract is a dependency. Admins are callers allowed
/// for specific admin actions (like changing parameters, topping up funds, etc.).
interface IAccessControl {
  error RequiresAdmin(address resource, address accessor);
  error ZeroAddress();

  event AdminSet(address indexed resource, address indexed admin);

  /// @notice Set an admin for a given resource
  /// @param resource An address which with `admin` should be allowed to administer
  /// @param admin An address which should be allowed to administer `resource`
  /// @dev This method is only callable by the super-admin (the admin of this AccessControl
  ///   contract)
  function setAdmin(address resource, address admin) external;

  /// @notice Require a valid admin for a given resource
  /// @param resource An address that `accessor` is attempting to access
  /// @param accessor An address on which to assert access control checks
  /// @dev This method reverts when `accessor` is not a valid admin
  function requireAdmin(address resource, address accessor) external view;

  /// @notice Require a super-admin. A super-admin is an admin of this AccessControl contract.
  /// @param accessor An address on which to assert access control checks
  /// @dev This method reverts when `accessor` is not a valid super-admin
  function requireSuperAdmin(address accessor) external view;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.12;

pragma experimental ABIEncoderV2;

import {ITranchedPool} from "./ITranchedPool.sol";

interface IBackerRewards {
  struct BackerRewardsTokenInfo {
    uint256 rewardsClaimed; // gfi claimed
    uint256 accRewardsPerPrincipalDollarAtMint; // Pool's accRewardsPerPrincipalDollar at PoolToken mint()
  }

  struct BackerRewardsInfo {
    uint256 accRewardsPerPrincipalDollar; // accumulator gfi per interest dollar
  }

  /// @notice Staking rewards parameters relevant to a TranchedPool
  struct StakingRewardsPoolInfo {
    // @notice the value `StakingRewards.accumulatedRewardsPerToken()` at the last checkpoint
    uint256 accumulatedRewardsPerTokenAtLastCheckpoint;
    // @notice last time the rewards info was updated
    //
    // we need this in order to know how much to pro rate rewards after the term is over.
    uint256 lastUpdateTime;
    // @notice staking rewards parameters for each slice of the tranched pool
    StakingRewardsSliceInfo[] slicesInfo;
  }

  /// @notice Staking rewards paramters relevant to a TranchedPool slice
  struct StakingRewardsSliceInfo {
    // @notice fidu share price when the slice is first drawn down
    //
    // we need to save this to calculate what an equivalent position in
    // the senior pool would be at the time the slice is downdown
    uint256 fiduSharePriceAtDrawdown;
    // @notice the amount of principal deployed at the last checkpoint
    //
    // we use this to calculate the amount of principal that should
    // acctually accrue rewards during between the last checkpoint and
    // and subsequent updates
    uint256 principalDeployedAtLastCheckpoint;
    // @notice the value of StakingRewards.accumulatedRewardsPerToken() at time of drawdown
    //
    // we need to keep track of this to use this as a base value to accumulate rewards
    // for tokens. If the token has never claimed staking rewards, we use this value
    // and the current staking rewards accumulator
    uint256 accumulatedRewardsPerTokenAtDrawdown;
    // @notice amount of rewards per token accumulated over the lifetime of the slice that a backer
    //          can claim
    uint256 accumulatedRewardsPerTokenAtLastCheckpoint;
    // @notice the amount of rewards per token accumulated over the lifetime of the slice
    //
    // this value is "unrealized" because backers will be unable to claim against this value.
    // we keep this value so that we can always accumulate rewards for the amount of capital
    // deployed at any point in time, but not allow backers to withdraw them until a payment
    // is made. For example: we want to accumulate rewards when a backer does a drawdown. but
    // a backer shouldn't be allowed to claim rewards until a payment is made.
    //
    // this value is scaled depending on the current proportion of capital currently deployed
    // in the slice. For example, if the staking rewards contract accrued 10 rewards per token
    // between the current checkpoint and a new update, and only 20% of the capital was deployed
    // during that period, we would accumulate 2 (10 * 20%) rewards.
    uint256 unrealizedAccumulatedRewardsPerTokenAtLastCheckpoint;
  }

  /// @notice Staking rewards parameters relevant to a PoolToken
  struct StakingRewardsTokenInfo {
    // @notice the amount of rewards accumulated the last time a token's rewards were withdrawn
    uint256 accumulatedRewardsPerTokenAtLastWithdraw;
  }

  /// @notice total amount of GFI rewards available, times 1e18
  function totalRewards() external view returns (uint256);

  /// @notice interest $ eligible for gfi rewards, times 1e18
  function maxInterestDollarsEligible() external view returns (uint256);

  /// @notice counter of total interest repayments, times 1e6
  function totalInterestReceived() external view returns (uint256);

  /// @notice totalRewards/totalGFISupply * 100, times 1e18
  function totalRewardPercentOfTotalGFI() external view returns (uint256);

  /// @notice Get backer rewards metadata for a pool token
  function getTokenInfo(uint256 poolTokenId) external view returns (BackerRewardsTokenInfo memory);

  /// @notice Get backer staking rewards metadata for a pool token
  function getStakingRewardsTokenInfo(
    uint256 poolTokenId
  ) external view returns (StakingRewardsTokenInfo memory);

  /// @notice Get backer staking rewards for a pool
  function getBackerStakingRewardsPoolInfo(
    ITranchedPool pool
  ) external view returns (StakingRewardsPoolInfo memory);

  /// @notice Calculates the accRewardsPerPrincipalDollar for a given pool,
  ///   when a interest payment is received by the protocol
  /// @param _interestPaymentAmount Atomic usdc amount of the interest payment
  function allocateRewards(uint256 _interestPaymentAmount) external;

  /// @notice callback for TranchedPools when they drawdown
  /// @param sliceIndex index of the tranched pool slice
  /// @dev initializes rewards info for the calling TranchedPool if it's the first
  ///  drawdown for the given slice
  function onTranchedPoolDrawdown(uint256 sliceIndex) external;

  /// @notice When a pool token is minted for multiple drawdowns,
  ///   set accRewardsPerPrincipalDollarAtMint to the current accRewardsPerPrincipalDollar price
  /// @param poolAddress Address of the pool associated with the pool token
  /// @param tokenId Pool token id
  function setPoolTokenAccRewardsPerPrincipalDollarAtMint(
    address poolAddress,
    uint256 tokenId
  ) external;

  /// @notice PoolToken request to withdraw all allocated rewards
  /// @param tokenId Pool token id
  /// @return amount of rewards withdrawn
  function withdraw(uint256 tokenId) external returns (uint256);

  /**
   * @notice Set BackerRewards and BackerStakingRewards metadata for tokens created by a pool token split.
   * @param originalBackerRewardsTokenInfo backer rewards info for the pool token that was split
   * @param originalStakingRewardsTokenInfo backer staking rewards info for the pool token that was split
   * @param newTokenId id of one of the tokens in the split
   * @param newRewardsClaimed rewardsClaimed value for the new token.
   */
  function setBackerAndStakingRewardsTokenInfoOnSplit(
    BackerRewardsTokenInfo memory originalBackerRewardsTokenInfo,
    StakingRewardsTokenInfo memory originalStakingRewardsTokenInfo,
    uint256 newTokenId,
    uint256 newRewardsClaimed
  ) external;

  /**
   * @notice Calculate the gross available gfi rewards for a PoolToken
   * @param tokenId Pool token id
   * @return The amount of GFI claimable
   */
  function poolTokenClaimableRewards(uint256 tokenId) external view returns (uint256);

  /// @notice Clear all BackerRewards and StakingRewards associated data for `tokenId`
  function clearTokenInfo(uint256 tokenId) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.12;

enum CapitalAssetType {
  INVALID,
  ERC721
}

interface ICapitalLedger {
  /**
   * @notice Emitted when a new capital erc721 deposit has been made
   * @param owner address owning the deposit
   * @param assetAddress address of the deposited ERC721
   * @param positionId id for the deposit
   * @param assetTokenId id of the token from the ERC721 `assetAddress`
   * @param usdcEquivalent usdc equivalent value at the time of deposit
   */
  event CapitalERC721Deposit(
    address indexed owner,
    address indexed assetAddress,
    uint256 positionId,
    uint256 assetTokenId,
    uint256 usdcEquivalent
  );

  /**
   * @notice Emitted when a new ERC721 capital withdrawal has been made
   * @param owner address owning the deposit
   * @param positionId id for the capital position
   * @param assetAddress address of the underlying ERC721
   * @param depositTimestamp block.timestamp of the original deposit
   */
  event CapitalERC721Withdrawal(
    address indexed owner,
    uint256 positionId,
    address assetAddress,
    uint256 depositTimestamp
  );

  /**
   * @notice Emitted when an ERC721 capital asset has been harvested
   * @param positionId id for the capital position
   * @param assetAddress address of the underlying ERC721
   */
  event CapitalERC721Harvest(uint256 indexed positionId, address assetAddress);

  /**
   * @notice Emitted when an ERC721 capital asset has been "kicked", which may cause the underlying
   *  usdc equivalent value to change.
   * @param positionId id for the capital position
   * @param assetAddress address of the underlying ERC721
   * @param usdcEquivalent new usdc equivalent value of the position
   */
  event CapitalPositionAdjustment(
    uint256 indexed positionId,
    address assetAddress,
    uint256 usdcEquivalent
  );

  /// Thrown when called with an invalid asset type for the function. Valid
  /// types are defined under CapitalAssetType
  error InvalidAssetType(CapitalAssetType);

  /**
   * @notice Account for a deposit of `id` for the ERC721 asset at `assetAddress`.
   * @dev reverts with InvalidAssetType if `assetAddress` is not an ERC721
   * @param owner address that owns the position
   * @param assetAddress address of the ERC20 address
   * @param assetTokenId id of the ERC721 asset to add
   * @return id of the newly created position
   */
  function depositERC721(
    address owner,
    address assetAddress,
    uint256 assetTokenId
  ) external returns (uint256);

  /**
   * @notice Get the id of the ERC721 asset held by position `id`. Pair this with
   *  `assetAddressOf` to get the address & id of the nft.
   * @dev reverts with InvalidAssetType if `assetAddress` is not an ERC721
   * @param positionId id of the position
   * @return id of the underlying ERC721 asset
   */
  function erc721IdOf(uint256 positionId) external view returns (uint256);

  /**
   * @notice Completely withdraw a position
   * @param positionId id of the position
   */
  function withdraw(uint256 positionId) external;

  /**
   * @notice Harvests the associated rewards, interest, and other accrued assets
   *  associated with the asset token. For example, if given a PoolToken asset,
   *  this will collect the GFI rewards (if available), redeemable interest, and
   *  redeemable principal, and send that to the `owner`.
   * @param positionId id of the position
   */
  function harvest(uint256 positionId) external;

  /**
   * @notice Get the asset address of the position. Example: For an ERC721 position, this
   *  returns the address of that ERC721 contract.
   * @param positionId id of the position
   * @return asset address of the position
   */
  function assetAddressOf(uint256 positionId) external view returns (address);

  /**
   * @notice Get the owner of a given position.
   * @param positionId id of the position
   * @return owner of the position
   */
  function ownerOf(uint256 positionId) external view returns (address);

  /**
   * @notice Total number of positions in the ledger
   * @return number of positions in the ledger
   */
  function totalSupply() external view returns (uint256);

  /**
   * @notice Get the number of capital positions held by an address
   * @param addr address
   * @return positions held by address
   */
  function balanceOf(address addr) external view returns (uint256);

  /**
   * @notice Returns a position ID owned by `owner` at a given `index` of its position list
   * @param owner owner of the positions
   * @param index index of the owner's balance to get the position ID of
   * @return position id
   *
   * @dev use with {balanceOf} to enumerate all of `owner`'s positions
   */
  function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);

  /**
   * @dev Returns a position ID at a given `index` of all the positions stored by the contract.
   * @param index index to get the position ID at
   * @return position id
   *
   * @dev use with {totalSupply} to enumerate all positions
   */
  function tokenByIndex(uint256 index) external view returns (uint256);

  /**
   * @notice Get the USDC value of `owner`s positions, reporting what is currently
   *  eligible and the total amount.
   * @param owner address owning the positions
   * @return eligibleAmount USDC value of positions eligible for rewards
   * @return totalAmount total USDC value of positions
   *
   * @dev this is used by Membership to determine how much is eligible in
   *  the current epoch vs the next epoch.
   */
  function totalsOf(
    address owner
  ) external view returns (uint256 eligibleAmount, uint256 totalAmount);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.12;
pragma experimental ABIEncoderV2;

interface ICreditLine {
  function borrower() external view returns (address);

  function limit() external view returns (uint256);

  function maxLimit() external view returns (uint256);

  function interestApr() external view returns (uint256);

  function paymentPeriodInDays() external view returns (uint256);

  function principalGracePeriodInDays() external view returns (uint256);

  function termInDays() external view returns (uint256);

  function lateFeeApr() external view returns (uint256);

  function isLate() external view returns (bool);

  function withinPrincipalGracePeriod() external view returns (bool);

  // Accounting variables
  function balance() external view returns (uint256);

  function interestOwed() external view returns (uint256);

  function principalOwed() external view returns (uint256);

  function termEndTime() external view returns (uint256);

  function nextDueTime() external view returns (uint256);

  function interestAccruedAsOf() external view returns (uint256);

  function lastFullPaymentTime() external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.12;

interface IERC20Splitter {
  function lastDistributionAt() external view returns (uint256);

  function distribute() external;

  function replacePayees(address[] calldata _payees, uint256[] calldata _shares) external;

  function pendingDistributionFor(address payee) external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.12;

interface IGFILedger {
  struct Position {
    // Owner of the position
    address owner;
    // Index of the position in the ownership array
    uint256 ownedIndex;
    // Amount of GFI held in the position
    uint256 amount;
    // When the position was deposited
    uint256 depositTimestamp;
  }

  /**
   * @notice Emitted when a new GFI deposit has been made
   * @param owner address owning the deposit
   * @param positionId id for the deposit
   * @param amount how much GFI was deposited
   */
  event GFIDeposit(address indexed owner, uint256 indexed positionId, uint256 amount);

  /**
   * @notice Emitted when a new GFI withdrawal has been made. If the remaining amount is 0, the position has bee removed
   * @param owner address owning the withdrawn position
   * @param positionId id for the position
   * @param remainingAmount how much GFI is remaining in the position
   * @param depositTimestamp block.timestamp of the original deposit
   */
  event GFIWithdrawal(
    address indexed owner,
    uint256 indexed positionId,
    uint256 withdrawnAmount,
    uint256 remainingAmount,
    uint256 depositTimestamp
  );

  /**
   * @notice Account for a new deposit by the owner.
   * @param owner address to account for the deposit
   * @param amount how much was deposited
   * @return how much was deposited
   */
  function deposit(address owner, uint256 amount) external returns (uint256);

  /**
   * @notice Account for a new withdraw by the owner.
   * @param positionId id of the position
   * @return how much was withdrawn
   */
  function withdraw(uint256 positionId) external returns (uint256);

  /**
   * @notice Account for a new withdraw by the owner.
   * @param positionId id of the position
   * @param amount how much to withdraw
   * @return how much was withdrawn
   */
  function withdraw(uint256 positionId, uint256 amount) external returns (uint256);

  /**
   * @notice Get the number of GFI positions held by an address
   * @param addr address
   * @return positions held by address
   */
  function balanceOf(address addr) external view returns (uint256);

  /**
   * @notice Get the owner of a given position.
   * @param positionId id of the position
   * @return owner of the position
   */
  function ownerOf(uint256 positionId) external view returns (address);

  /**
   * @notice Total number of positions in the ledger
   * @return number of positions in the ledger
   */
  function totalSupply() external view returns (uint256);

  /**
   * @notice Returns a position ID owned by `owner` at a given `index` of its position list
   * @param owner owner of the positions
   * @param index index of the owner's balance to get the position ID of
   * @return position id
   *
   * @dev use with {balanceOf} to enumerate all of `owner`'s positions
   */
  function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);

  /**
   * @dev Returns a position ID at a given `index` of all the positions stored by the contract.
   * @param index index to get the position ID at
   * @return token id
   *
   * @dev use with {totalSupply} to enumerate all positions
   */
  function tokenByIndex(uint256 index) external view returns (uint256);

  /**
   * @notice Get amount of GFI of `owner`s positions, reporting what is currently
   *  eligible and the total amount.
   * @return eligibleAmount GFI amount of positions eligible for rewards
   * @return totalAmount total GFI amount of positions
   *
   * @dev this is used by Membership to determine how much is eligible in
   *  the current epoch vs the next epoch.
   */
  function totalsOf(
    address owner
  ) external view returns (uint256 eligibleAmount, uint256 totalAmount);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.12;
pragma experimental ABIEncoderV2;

abstract contract IGo {
  uint256 public constant ID_TYPE_0 = 0;
  uint256 public constant ID_TYPE_1 = 1;
  uint256 public constant ID_TYPE_2 = 2;
  uint256 public constant ID_TYPE_3 = 3;
  uint256 public constant ID_TYPE_4 = 4;
  uint256 public constant ID_TYPE_5 = 5;
  uint256 public constant ID_TYPE_6 = 6;
  uint256 public constant ID_TYPE_7 = 7;
  uint256 public constant ID_TYPE_8 = 8;
  uint256 public constant ID_TYPE_9 = 9;
  uint256 public constant ID_TYPE_10 = 10;

  /// @notice Returns the address of the UniqueIdentity contract.
  function uniqueIdentity() external virtual returns (address);

  function go(address account) public view virtual returns (bool);

  function goOnlyIdTypes(
    address account,
    uint256[] calldata onlyIdTypes
  ) public view virtual returns (bool);

  /**
   * @notice Returns whether the provided account is go-listed for use of the SeniorPool on the Goldfinch protocol.
   * @param account The account whose go status to obtain
   * @return true if `account` is go listed
   */
  function goSeniorPool(address account) public view virtual returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.12;

interface IMembershipCollector {
  /// @notice Have the collector distribute `amount` of Fidu to `addr`
  /// @param addr address to distribute to
  /// @param amount amount to distribute
  function distributeFiduTo(address addr, uint256 amount) external;

  /// @notice Get the last epoch finalized by the collector. This means the
  ///  collector will no longer add rewards to the epoch.
  /// @return the last finalized epoch
  function lastFinalizedEpoch() external view returns (uint256);

  /// @notice Get the rewards associated with `epoch`. This amount may change
  ///  until `epoch` has been finalized (is less than or equal to getLastFinalizedEpoch)
  /// @return rewards associated with `epoch`
  function rewardsForEpoch(uint256 epoch) external view returns (uint256);

  /// @notice Estimate rewards for a given epoch. For epochs at or before lastFinalizedEpoch
  ///  this will be the fixed, accurate reward for the epoch. For the current and other
  ///  non-finalized epochs, this will be the value as if the epoch were finalized in that
  ///  moment.
  /// @param epoch epoch to estimate the rewards of
  /// @return rewards associated with `epoch`
  function estimateRewardsFor(uint256 epoch) external view returns (uint256);

  /// @notice Finalize all unfinalized epochs. Causes the reserve splitter to distribute
  ///  if there are unfinalized epochs so all possible rewards are distributed.
  function finalizeEpochs() external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.12;

interface IMembershipDirector {
  /**
   * @notice Adjust an `owner`s membership score and position due to the change
   *  in their GFI and Capital holdings
   * @param owner address who's holdings changed
   * @return id of membership position
   */
  function consumeHoldingsAdjustment(address owner) external returns (uint256);

  /**
   * @notice Collect all membership yield enhancements for the owner.
   * @param owner address to claim rewards for
   * @return amount of yield enhancements collected
   */
  function collectRewards(address owner) external returns (uint256);

  /**
   * @notice Check how many rewards are claimable for the owner. The return
   *  value here is how much would be retrieved by calling `collectRewards`.
   * @param owner address to calculate claimable rewards for
   * @return the amount of rewards that could be claimed by the owner
   */
  function claimableRewards(address owner) external view returns (uint256);

  /**
   * @notice Calculate the membership score
   * @param gfi Amount of gfi
   * @param capital Amount of capital in USDC
   * @return membership score
   */
  function calculateMembershipScore(uint256 gfi, uint256 capital) external view returns (uint256);

  /**
   * @notice Get the current score of `owner`
   * @param owner address to check the score of
   * @return eligibleScore score that is currently eligible for rewards
   * @return totalScore score that will be elgible for rewards next epoch
   */
  function currentScore(
    address owner
  ) external view returns (uint256 eligibleScore, uint256 totalScore);

  /**
   * @notice Get the sum of all member scores that are currently eligible and that will be eligible next epoch
   * @return eligibleTotal sum of all member scores that are currently eligible
   * @return nextEpochTotal sum of all member scores that will be eligible next epoch
   */
  function totalMemberScores()
    external
    view
    returns (uint256 eligibleTotal, uint256 nextEpochTotal);

  /**
   * @notice Estimate the score for an existing member, given some changes in GFI and capital
   * @param memberAddress the member's address
   * @param gfi the change in gfi holdings, denominated in GFI
   * @param capital the change in gfi holdings, denominated in USDC
   * @return score resulting score for the member given the GFI and capital changes
   */
  function estimateMemberScore(
    address memberAddress,
    int256 gfi,
    int256 capital
  ) external view returns (uint256 score);

  /// @notice Finalize all unfinalized epochs. Causes the reserve splitter to distribute
  ///  if there are unfinalized epochs so all possible rewards are distributed.
  function finalizeEpochs() external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.12;

interface IMembershipLedger {
  /**
   * @notice Set `addr`s allocated rewards back to 0
   * @param addr address to reset rewards on
   */
  function resetRewards(address addr) external;

  /**
   * @notice Allocate `amount` rewards for `addr` but do not send them
   * @param addr address to distribute rewards to
   * @param amount amount of rewards to allocate for `addr`
   * @return rewards total allocated to `addr`
   */
  function allocateRewardsTo(address addr, uint256 amount) external returns (uint256 rewards);

  /**
   * @notice Get the rewards allocated to a certain `addr`
   * @param addr the address to check pending rewards for
   * @return rewards pending rewards for `addr`
   */
  function getPendingRewardsFor(address addr) external view returns (uint256 rewards);

  /**
   * @notice Get the alpha parameter for the cobb douglas function. Will always be in (0,1).
   * @return numerator numerator for the alpha param
   * @return denominator denominator for the alpha param
   */
  function alpha() external view returns (uint128 numerator, uint128 denominator);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.12;

import {Context} from "../cake/Context.sol";

struct CapitalDeposit {
  /// Address of the asset being deposited
  /// @dev must be supported in CapitalAssets.sol
  address assetAddress;
  /// Id of the nft
  uint256 id;
}

struct Deposit {
  /// Amount of gfi to deposit
  uint256 gfi;
  /// List of capital deposits
  CapitalDeposit[] capitalDeposits;
}

struct DepositResult {
  uint256 membershipId;
  uint256 gfiPositionId;
  uint256[] capitalPositionIds;
}

struct ERC20Withdrawal {
  uint256 id;
  uint256 amount;
}

struct Withdrawal {
  /// List of gfi token ids to withdraw
  ERC20Withdrawal[] gfiPositions;
  /// List of capital token ids to withdraw
  uint256[] capitalPositions;
}

/**
 * @title MembershipOrchestrator
 * @notice Externally facing gateway to all Goldfinch membership functionality.
 * @author Goldfinch
 */
interface IMembershipOrchestrator {
  /**
   * @notice Deposit multiple assets defined in `multiDeposit`. Assets can include GFI, Staked Fidu,
   *  and others.
   * @param deposit struct describing all the assets to deposit
   * @return ids all of the ids of the created depoits, in the same order as deposit. If GFI is
   *  present, it will be the first id.
   */
  function deposit(Deposit calldata deposit) external returns (DepositResult memory);

  /**
   * @notice Withdraw multiple assets defined in `multiWithdraw`. Assets can be GFI or capital
   *  positions ids. Caller must have been permitted to act upon all of the positions.
   * @param withdrawal all of the GFI and Capital ids to withdraw
   */
  function withdraw(Withdrawal calldata withdrawal) external;

  /**
   * @notice Collect all membership rewards for the caller.
   * @return how many rewards were collected and sent to caller
   */
  function collectRewards() external returns (uint256);

  /**
   * @notice Harvest the rewards, interest, redeemable principal, or other assets
   *  associated with the underlying capital asset. For example, if given a PoolToken,
   *  this will collect the GFI rewards (if available), redeemable interest, and
   *  redeemable principal, and send that to the owner of the capital position.
   * @param capitalPositionIds id of the capital position to harvest the underlying asset of
   */
  function harvest(uint256[] calldata capitalPositionIds) external;

  /**
   * @notice Check how many rewards are claimable at this moment in time for caller.
   * @param addr the address to check claimable rewards for
   * @return how many rewards could be claimed by a call to `collectRewards`
   */
  function claimableRewards(address addr) external view returns (uint256);

  /**
   * @notice Check the voting power of a given address
   * @param addr the address to check the voting power of
   * @return the voting power
   */
  function votingPower(address addr) external view returns (uint256);

  /**
   * @notice Get all GFI in Membership held by `addr`. This returns the current eligible amount and the
   *  total amount of GFI.
   * @param addr the owner
   * @return eligibleAmount how much GFI is currently eligible for rewards
   * @return totalAmount how much GFI is currently eligible for rewards
   */
  function totalGFIHeldBy(
    address addr
  ) external view returns (uint256 eligibleAmount, uint256 totalAmount);

  /**
   * @notice Get all capital, denominated in USDC, in Membership held by `addr`. This returns the current
   *  eligible amount and the total USDC value of capital.
   * @param addr the owner
   * @return eligibleAmount how much USDC of capital is currently eligible for rewards
   * @return totalAmount how much  USDC of capital is currently eligible for rewards
   */
  function totalCapitalHeldBy(
    address addr
  ) external view returns (uint256 eligibleAmount, uint256 totalAmount);

  /**
   * @notice Get the member score of `addr`
   * @param addr the owner
   * @return eligibleScore the currently eligible score
   * @return totalScore the total score that will be eligible next epoch
   *
   * @dev if eligibleScore == totalScore then there are no changes between now and the next epoch
   */
  function memberScoreOf(
    address addr
  ) external view returns (uint256 eligibleScore, uint256 totalScore);

  /**
   * @notice Estimate rewards for a given epoch. For epochs at or before lastFinalizedEpoch
   *  this will be the fixed, accurate reward for the epoch. For the current and other
   *  non-finalized epochs, this will be the value as if the epoch were finalized in that
   *  moment.
   * @param epoch epoch to estimate the rewards of
   * @return rewards associated with `epoch`
   */
  function estimateRewardsFor(uint256 epoch) external view returns (uint256);

  /**
   * @notice Calculate what the Membership Score would be if a `gfi` amount of GFI and `capital` amount
   *  of Capital denominated in USDC were deposited.
   * @param gfi amount of GFI to estimate with
   * @param capital amount of capital to estimate with, denominated in USDC
   * @return score the resulting score
   */
  function calculateMemberScore(uint256 gfi, uint256 capital) external view returns (uint256 score);

  /**
   * @notice Get the sum of all member scores that are currently eligible and that will be eligible next epoch
   * @return eligibleTotal sum of all member scores that are currently eligible
   * @return nextEpochTotal sum of all member scores that will be eligible next epoch
   */
  function totalMemberScores()
    external
    view
    returns (uint256 eligibleTotal, uint256 nextEpochTotal);

  /**
   * @notice Estimate the score for an existing member, given some changes in GFI and capital
   * @param memberAddress the member's address
   * @param gfi the change in gfi holdings, denominated in GFI
   * @param capital the change in gfi holdings, denominated in USDC
   * @return score resulting score for the member given the GFI and capital changes
   */
  function estimateMemberScore(
    address memberAddress,
    int256 gfi,
    int256 capital
  ) external view returns (uint256 score);

  /// @notice Finalize all unfinalized epochs. Causes the reserve splitter to distribute
  ///  if there are unfinalized epochs so all possible rewards are distributed.
  function finalizeEpochs() external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.12;

import "@openzeppelin/contracts-upgradeable/interfaces/IERC721Upgradeable.sol";

struct Position {
  // address owning the position
  address owner;
  // how much of the position is eligible as of checkpointEpoch
  uint256 eligibleAmount;
  // how much of the postion is eligible the epoch after checkpointEpoch
  uint256 nextEpochAmount;
  // when the position was first created
  uint256 createdTimestamp;
  // epoch of the last checkpoint
  uint256 checkpointEpoch;
}

/**
 * @title IMembershipVault
 * @notice Track assets held by owners in a vault, as well as the total held in the vault. Assets
 *  are not accounted for until the next epoch for MEV protection.
 * @author Goldfinch
 */
interface IMembershipVault is IERC721Upgradeable {
  /**
   * @notice Emitted when an owner has adjusted their holdings in a vault
   * @param owner the owner increasing their holdings
   * @param eligibleAmount the new eligible amount
   * @param nextEpochAmount the new next epoch amount
   */
  event AdjustedHoldings(address indexed owner, uint256 eligibleAmount, uint256 nextEpochAmount);

  /**
   * @notice Emitted when the total within the vault has changed
   * @param eligibleAmount new current amount
   * @param nextEpochAmount new next epoch amount
   */
  event VaultTotalUpdate(uint256 eligibleAmount, uint256 nextEpochAmount);

  /**
   * @notice Get the current value of `owner`. This changes depending on the current
   *  block.timestamp as increased holdings are not accounted for until the subsequent epoch.
   * @param owner address owning the positions
   * @return sum of all positions held by an address
   */
  function currentValueOwnedBy(address owner) external view returns (uint256);

  /**
   * @notice Get the total value in the vault as of block.timestamp
   * @return total value in the vault as of block.timestamp
   */
  function currentTotal() external view returns (uint256);

  /**
   * @notice Get the total value in the vault as of epoch
   * @return total value in the vault as of epoch
   */
  function totalAtEpoch(uint256 epoch) external view returns (uint256);

  /**
   * @notice Get the position owned by `owner`
   * @return position owned by `owner`
   */
  function positionOwnedBy(address owner) external view returns (Position memory);

  /**
   * @notice Record an adjustment in holdings. Eligible assets will update this epoch and
   *  total assets will become eligible the subsequent epoch.
   * @param owner the owner to checkpoint
   * @param eligibleAmount amount of points to apply to the current epoch
   * @param nextEpochAmount amount of points to apply to the next epoch
   * @return id of the position
   */
  function adjustHoldings(
    address owner,
    uint256 eligibleAmount,
    uint256 nextEpochAmount
  ) external returns (uint256);

  /**
   * @notice Checkpoint a specific owner & the vault total
   * @param owner the owner to checkpoint
   *
   * @dev to collect rewards, this must be called before `increaseHoldings` or
   *  `decreaseHoldings`. Those functions must call checkpoint internally
   *  so the historical data will be lost otherwise.
   */
  function checkpoint(address owner) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.12;
pragma experimental ABIEncoderV2;

import "./openzeppelin/IERC721.sol";

interface IPoolTokens is IERC721 {
  struct TokenInfo {
    address pool;
    uint256 tranche;
    uint256 principalAmount;
    uint256 principalRedeemed;
    uint256 interestRedeemed;
  }

  struct MintParams {
    uint256 principalAmount;
    uint256 tranche;
  }

  struct PoolInfo {
    uint256 totalMinted;
    uint256 totalPrincipalRedeemed;
    bool created;
  }

  /**
   * @notice Called by pool to create a debt position in a particular tranche and amount
   * @param params Struct containing the tranche and the amount
   * @param to The address that should own the position
   * @return tokenId The token ID (auto-incrementing integer across all pools)
   */
  function mint(MintParams calldata params, address to) external returns (uint256);

  /**
   * @notice Redeem principal and interest on a pool token. Called by valid pools as part of their redemption
   *  flow
   * @param tokenId pool token id
   * @param principalRedeemed principal to redeem. This cannot exceed the token's principal amount, and
   *  the redemption cannot cause the pool's total principal redeemed to exceed the pool's total minted
   *  principal
   * @param interestRedeemed interest to redeem.
   */
  function redeem(uint256 tokenId, uint256 principalRedeemed, uint256 interestRedeemed) external;

  /**
   * @notice Withdraw a pool token's principal up to the token's principalAmount. Called by valid pools
   *  as part of their withdraw flow before the pool is locked (i.e. before the principal is committed)
   * @param tokenId pool token id
   * @param principalAmount principal to withdraw
   */
  function withdrawPrincipal(uint256 tokenId, uint256 principalAmount) external;

  /**
   * @notice Burns a specific ERC721 token and removes deletes the token metadata for PoolTokens, BackerReards,
   *  and BackerStakingRewards
   * @param tokenId uint256 id of the ERC721 token to be burned.
   */
  function burn(uint256 tokenId) external;

  /**
   * @notice Called by the GoldfinchFactory to register the pool as a valid pool. Only valid pools can mint/redeem
   * tokens
   * @param newPool The address of the newly created pool
   */
  function onPoolCreated(address newPool) external;

  function getTokenInfo(uint256 tokenId) external view returns (TokenInfo memory);

  function getPoolInfo(address pool) external view returns (PoolInfo memory);

  /// @notice Query if `pool` is a valid pool. A pool is valid if it was created by the Goldfinch Factory
  function validPool(address pool) external view returns (bool);

  function isApprovedOrOwner(address spender, uint256 tokenId) external view returns (bool);

  /**
   * @notice Splits a pool token into two smaller positions. The original token is burned and all
   * its associated data is deleted.
   * @param tokenId id of the token to split.
   * @param newPrincipal1 principal amount for the first token in the split. The principal amount for the
   *  second token in the split is implicitly the original token's principal amount less newPrincipal1
   * @return tokenId1 id of the first token in the split
   * @return tokenId2 id of the second token in the split
   */
  function splitToken(
    uint256 tokenId,
    uint256 newPrincipal1
  ) external returns (uint256 tokenId1, uint256 tokenId2);

  /**
   * @notice Mint event emitted for a new TranchedPool deposit or when an existing pool token is
   *  split
   * @param owner address to which the token was minted
   * @param pool tranched pool that the deposit was in
   * @param tokenId ERC721 tokenId
   * @param amount the deposit amount
   * @param tranche id of the tranche of the deposit
   */
  event TokenMinted(
    address indexed owner,
    address indexed pool,
    uint256 indexed tokenId,
    uint256 amount,
    uint256 tranche
  );

  /**
   * @notice Redeem event emitted when interest and/or principal is redeemed in the token's pool
   * @param owner owner of the pool token
   * @param pool tranched pool that the token belongs to
   * @param principalRedeemed amount of principal redeemed from the pool
   * @param interestRedeemed amount of interest redeemed from the pool
   * @param tranche id of the tranche the token belongs to
   */
  event TokenRedeemed(
    address indexed owner,
    address indexed pool,
    uint256 indexed tokenId,
    uint256 principalRedeemed,
    uint256 interestRedeemed,
    uint256 tranche
  );

  /**
   * @notice Burn event emitted when the token owner/operator manually burns the token or burns
   *  it implicitly by splitting it
   * @param owner owner of the pool token
   * @param pool tranched pool that the token belongs to
   */
  event TokenBurned(address indexed owner, address indexed pool, uint256 indexed tokenId);

  /**
   * @notice Split event emitted when the token owner/operator splits the token
   * @param pool tranched pool to which the orginal and split tokens belong
   * @param tokenId id of the original token that was split
   * @param newTokenId1 id of the first split token
   * @param newPrincipal1 principalAmount of the first split token
   * @param newTokenId2 id of the second split token
   * @param newPrincipal2 principalAmount of the second split token
   */
  event TokenSplit(
    address indexed owner,
    address indexed pool,
    uint256 indexed tokenId,
    uint256 newTokenId1,
    uint256 newPrincipal1,
    uint256 newTokenId2,
    uint256 newPrincipal2
  );

  /**
   * @notice Principal Withdrawn event emitted when a token's principal is withdrawn from the pool
   *  BEFORE the pool's drawdown period
   * @param pool tranched pool of the token
   * @param principalWithdrawn amount of principal withdrawn from the pool
   */
  event TokenPrincipalWithdrawn(
    address indexed owner,
    address indexed pool,
    uint256 indexed tokenId,
    uint256 principalWithdrawn,
    uint256 tranche
  );
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

/// @title IRouter
/// @author landakram
/// @notice This contract provides service discovery for contracts using the cake framework.
///   It can be used in conjunction with the convenience methods defined in the `Routing.Context`
///   and `Routing.Keys` libraries.
interface IRouter {
  event SetContract(bytes4 indexed key, address indexed addr);

  /// @notice Associate a routing key to a contract address
  /// @dev This function is only callable by the Router admin
  /// @param key A routing key (defined in the `Routing.Keys` libary)
  /// @param addr A contract address
  function setContract(bytes4 key, address addr) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.12;
pragma experimental ABIEncoderV2;

import {ITranchedPool} from "./ITranchedPool.sol";
import {ISeniorPoolEpochWithdrawals} from "./ISeniorPoolEpochWithdrawals.sol";

abstract contract ISeniorPool is ISeniorPoolEpochWithdrawals {
  uint256 public sharePrice;
  uint256 public totalLoansOutstanding;
  uint256 public totalWritedowns;

  function deposit(uint256 amount) external virtual returns (uint256 depositShares);

  function depositWithPermit(
    uint256 amount,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external virtual returns (uint256 depositShares);

  /**
   * @notice Withdraw `usdcAmount` of USDC, bypassing the epoch withdrawal system. Callable
   * by Zapper only.
   */
  function withdraw(uint256 usdcAmount) external virtual returns (uint256 amount);

  /**
   * @notice Withdraw `fiduAmount` of FIDU converted to USDC at the current share price,
   * bypassing the epoch withdrawal system. Callable by Zapper only
   */
  function withdrawInFidu(uint256 fiduAmount) external virtual returns (uint256 amount);

  function invest(ITranchedPool pool) external virtual returns (uint256);

  function estimateInvestment(ITranchedPool pool) external view virtual returns (uint256);

  function redeem(uint256 tokenId) external virtual;

  function writedown(uint256 tokenId) external virtual;

  function calculateWritedown(
    uint256 tokenId
  ) external view virtual returns (uint256 writedownAmount);

  function sharesOutstanding() external view virtual returns (uint256);

  function assets() external view virtual returns (uint256);

  function getNumShares(uint256 amount) public view virtual returns (uint256);

  event DepositMade(address indexed capitalProvider, uint256 amount, uint256 shares);
  event WithdrawalMade(address indexed capitalProvider, uint256 userAmount, uint256 reserveAmount);
  event InterestCollected(address indexed payer, uint256 amount);
  event PrincipalCollected(address indexed payer, uint256 amount);
  event ReserveFundsCollected(address indexed user, uint256 amount);
  event ReserveSharesCollected(address indexed user, address indexed reserve, uint256 amount);

  event PrincipalWrittenDown(address indexed tranchedPool, int256 amount);
  event InvestmentMadeInSenior(address indexed tranchedPool, uint256 amount);
  event InvestmentMadeInJunior(address indexed tranchedPool, uint256 amount);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.12;

pragma experimental ABIEncoderV2;

interface ISeniorPoolEpochWithdrawals {
  /**
   * @notice A withdrawal epoch
   * @param endsAt timestamp the epoch ends
   * @param fiduRequested amount of fidu requested in the epoch, including fidu
   *                      carried over from previous epochs
   * @param fiduLiquidated Amount of fidu that was liquidated at the end of this epoch
   * @param usdcAllocated Amount of usdc that was allocated to liquidate fidu.
   *                      Does not consider withdrawal fees.
   */
  struct Epoch {
    uint256 endsAt;
    uint256 fiduRequested;
    uint256 fiduLiquidated;
    uint256 usdcAllocated;
  }

  /**
   * @notice A user's request for withdrawal
   * @param epochCursor id of next epoch the user can liquidate their request
   * @param fiduRequested amount of fidu left to liquidate since last checkpoint
   * @param usdcWithdrawable amount of usdc available for a user to withdraw
   */
  struct WithdrawalRequest {
    uint256 epochCursor;
    uint256 usdcWithdrawable;
    uint256 fiduRequested;
  }

  /**
   * @notice Returns the amount of unallocated usdc in the senior pool, taking into account
   *         usdc that _will_ be allocated to withdrawals when a checkpoint happens
   */
  function usdcAvailable() external view returns (uint256);

  /// @notice Current duration of withdrawal epochs, in seconds
  function epochDuration() external view returns (uint256);

  /// @notice Update epoch duration
  function setEpochDuration(uint256 newEpochDuration) external;

  /// @notice The current withdrawal epoch
  function currentEpoch() external view returns (Epoch memory);

  /// @notice Get request by tokenId. A request is considered active if epochCursor > 0.
  function withdrawalRequest(uint256 tokenId) external view returns (WithdrawalRequest memory);

  /**
   * @notice Submit a request to withdraw `fiduAmount` of FIDU. Request is rejected
   * if caller already owns a request token. A non-transferrable request token is
   * minted to the caller
   * @return tokenId token minted to caller
   */
  function requestWithdrawal(uint256 fiduAmount) external returns (uint256 tokenId);

  /**
   * @notice Add `fiduAmount` FIDU to a withdrawal request for `tokenId`. Caller
   * must own tokenId
   */
  function addToWithdrawalRequest(uint256 fiduAmount, uint256 tokenId) external;

  /**
   * @notice Cancel request for tokenId. The fiduRequested (minus a fee) is returned
   * to the caller. Caller must own tokenId.
   * @return fiduReceived the fidu amount returned to the caller
   */
  function cancelWithdrawalRequest(uint256 tokenId) external returns (uint256 fiduReceived);

  /**
   * @notice Transfer the usdcWithdrawable of request for tokenId to the caller.
   * Caller must own tokenId
   */
  function claimWithdrawalRequest(uint256 tokenId) external returns (uint256 usdcReceived);

  /// @notice Emitted when the epoch duration is changed
  event EpochDurationChanged(uint256 newDuration);

  /// @notice Emitted when a new withdraw request has been created
  event WithdrawalRequested(
    uint256 indexed epochId,
    uint256 indexed tokenId,
    address indexed operator,
    uint256 fiduRequested
  );

  /// @notice Emitted when a user adds to their existing withdraw request
  /// @param epochId epoch that the withdraw was added to
  /// @param tokenId id of token that represents the position being added to
  /// @param operator address that added to the request
  /// @param fiduRequested amount of additional fidu added to request
  event WithdrawalAddedTo(
    uint256 indexed epochId,
    uint256 indexed tokenId,
    address indexed operator,
    uint256 fiduRequested
  );

  /// @notice Emitted when a withdraw request has been canceled
  event WithdrawalCanceled(
    uint256 indexed epochId,
    uint256 indexed tokenId,
    address indexed operator,
    uint256 fiduCanceled,
    uint256 reserveFidu
  );

  /// @notice Emitted when an epoch has been checkpointed
  /// @param epochId id of epoch that ended
  /// @param endTime timestamp the epoch ended
  /// @param fiduRequested amount of FIDU oustanding when the epoch ended
  /// @param usdcAllocated amount of USDC allocated to liquidate FIDU
  /// @param fiduLiquidated amount of FIDU liquidated using `usdcAllocated`
  event EpochEnded(
    uint256 indexed epochId,
    uint256 endTime,
    uint256 fiduRequested,
    uint256 usdcAllocated,
    uint256 fiduLiquidated
  );

  /// @notice Emitted when an epoch could not be finalized and is extended instead
  /// @param epochId id of epoch that was extended
  /// @param newEndTime new epoch end time
  /// @param oldEndTime previous epoch end time
  event EpochExtended(uint256 indexed epochId, uint256 newEndTime, uint256 oldEndTime);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.12;

pragma experimental ABIEncoderV2;

import {IERC721} from "./openzeppelin/IERC721.sol";
import {IERC721Metadata} from "./openzeppelin/IERC721Metadata.sol";
import {IERC721Enumerable} from "./openzeppelin/IERC721Enumerable.sol";

interface IStakingRewards is IERC721, IERC721Metadata, IERC721Enumerable {
  /// @notice Get the staking rewards position
  /// @param tokenId id of the position token
  /// @return position the position
  function getPosition(uint256 tokenId) external view returns (StakedPosition memory position);

  /// @notice Unstake an amount of `stakingToken()` (FIDU, FiduUSDCCurveLP, etc) associated with
  ///   a given position and transfer to msg.sender. Any remaining staked amount will continue to
  ///   accrue rewards.
  /// @dev This function checkpoints rewards
  /// @param tokenId A staking position token ID
  /// @param amount Amount of `stakingToken()` to be unstaked from the position
  function unstake(uint256 tokenId, uint256 amount) external;

  /// @notice Add `amount` to an existing FIDU position (`tokenId`)
  /// @param tokenId A staking position token ID
  /// @param amount Amount of `stakingToken()` to be added to tokenId's position
  function addToStake(uint256 tokenId, uint256 amount) external;

  /// @notice Returns the staked balance of a given position token.
  /// @dev The value returned is the bare amount, not the effective amount. The bare amount represents
  ///   the number of tokens the user has staked for a given position. The effective amount is the bare
  ///   amount multiplied by the token's underlying asset type multiplier. This multiplier is a crypto-
  ///   economic parameter determined by governance.
  /// @param tokenId A staking position token ID
  /// @return Amount of staked tokens denominated in `stakingToken().decimals()`
  function stakedBalanceOf(uint256 tokenId) external view returns (uint256);

  /// @notice Deposit to FIDU and USDC into the Curve LP, and stake your Curve LP tokens in the same transaction.
  /// @param fiduAmount The amount of FIDU to deposit
  /// @param usdcAmount The amount of USDC to deposit
  function depositToCurveAndStakeFrom(
    address nftRecipient,
    uint256 fiduAmount,
    uint256 usdcAmount
  ) external;

  /// @notice "Kick" a user's reward multiplier. If they are past their lock-up period, their reward
  ///   multiplier will be reset to 1x.
  /// @dev This will also checkpoint their rewards up to the current time.
  function kick(uint256 tokenId) external;

  /// @notice Accumulated rewards per token at the last checkpoint
  function accumulatedRewardsPerToken() external view returns (uint256);

  /// @notice The block timestamp when rewards were last checkpointed
  function lastUpdateTime() external view returns (uint256);

  /// @notice Claim rewards for a given staked position
  /// @param tokenId A staking position token ID
  /// @return amount of rewards claimed
  function getReward(uint256 tokenId) external returns (uint256);

  /* ========== EVENTS ========== */

  event RewardAdded(uint256 reward);
  event Staked(
    address indexed user,
    uint256 indexed tokenId,
    uint256 amount,
    StakedPositionType positionType,
    uint256 baseTokenExchangeRate
  );
  event DepositedAndStaked(
    address indexed user,
    uint256 depositedAmount,
    uint256 indexed tokenId,
    uint256 amount
  );
  event DepositedToCurve(
    address indexed user,
    uint256 fiduAmount,
    uint256 usdcAmount,
    uint256 tokensReceived
  );
  event DepositedToCurveAndStaked(
    address indexed user,
    uint256 fiduAmount,
    uint256 usdcAmount,
    uint256 indexed tokenId,
    uint256 amount
  );
  event AddToStake(
    address indexed user,
    uint256 indexed tokenId,
    uint256 amount,
    StakedPositionType positionType
  );
  event Unstaked(
    address indexed user,
    uint256 indexed tokenId,
    uint256 amount,
    StakedPositionType positionType
  );
  event UnstakedMultiple(address indexed user, uint256[] tokenIds, uint256[] amounts);
  event RewardPaid(address indexed user, uint256 indexed tokenId, uint256 reward);
  event RewardsParametersUpdated(
    address indexed who,
    uint256 targetCapacity,
    uint256 minRate,
    uint256 maxRate,
    uint256 minRateAtPercent,
    uint256 maxRateAtPercent
  );
  event EffectiveMultiplierUpdated(
    address indexed who,
    StakedPositionType positionType,
    uint256 multiplier
  );
}

/// @notice Indicates which ERC20 is staked
enum StakedPositionType {
  Fidu,
  CurveLP
}

struct Rewards {
  uint256 totalUnvested;
  uint256 totalVested;
  // @dev DEPRECATED (definition kept for storage slot)
  //   For legacy vesting positions, this was used in the case of slashing.
  //   For non-vesting positions, this is unused.
  uint256 totalPreviouslyVested;
  uint256 totalClaimed;
  uint256 startTime;
  // @dev DEPRECATED (definition kept for storage slot)
  //   For legacy vesting positions, this is the endTime of the vesting.
  //   For non-vesting positions, this is 0.
  uint256 endTime;
}

struct StakedPosition {
  // @notice Staked amount denominated in `stakingToken().decimals()`
  uint256 amount;
  // @notice Struct describing rewards owed with vesting
  Rewards rewards;
  // @notice Multiplier applied to staked amount when locking up position
  uint256 leverageMultiplier;
  // @notice Time in seconds after which position can be unstaked
  uint256 lockedUntil;
  // @notice Type of the staked position
  StakedPositionType positionType;
  // @notice Multiplier applied to staked amount to denominate in `baseStakingToken().decimals()`
  // @dev This field should not be used directly; it may be 0 for staked positions created prior to GIP-1.
  //  If you need this field, use `safeEffectiveMultiplier()`, which correctly handles old staked positions.
  uint256 unsafeEffectiveMultiplier;
  // @notice Exchange rate applied to staked amount to denominate in `baseStakingToken().decimals()`
  // @dev This field should not be used directly; it may be 0 for staked positions created prior to GIP-1.
  //  If you need this field, use `safeBaseTokenExchangeRate()`, which correctly handles old staked positions.
  uint256 unsafeBaseTokenExchangeRate;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.12;
pragma experimental ABIEncoderV2;

import {IV2CreditLine} from "./IV2CreditLine.sol";

abstract contract ITranchedPool {
  IV2CreditLine public creditLine;
  uint256 public createdAt;
  enum Tranches {
    Reserved,
    Senior,
    Junior
  }

  struct TrancheInfo {
    uint256 id;
    uint256 principalDeposited;
    uint256 principalSharePrice;
    uint256 interestSharePrice;
    uint256 lockedUntil;
  }

  struct PoolSlice {
    TrancheInfo seniorTranche;
    TrancheInfo juniorTranche;
    uint256 totalInterestAccrued;
    uint256 principalDeployed;
  }

  function initialize(
    address _config,
    address _borrower,
    uint256 _juniorFeePercent,
    uint256 _limit,
    uint256 _interestApr,
    uint256 _paymentPeriodInDays,
    uint256 _termInDays,
    uint256 _lateFeeApr,
    uint256 _principalGracePeriodInDays,
    uint256 _fundableAt,
    uint256[] calldata _allowedUIDTypes
  ) public virtual;

  /**
   * @notice Get the array of all UID types that are allowed to interact with this pool.
   * @return array of UID types
   *
   * @dev This only exists on TranchedPools deployed from Nov 2022 onward
   */
  function getAllowedUIDTypes() external view virtual returns (uint256[] memory);

  function getTranche(uint256 tranche) external view virtual returns (TrancheInfo memory);

  function pay(uint256 amount) external virtual;

  function poolSlices(uint256 index) external view virtual returns (PoolSlice memory);

  function lockJuniorCapital() external virtual;

  function lockPool() external virtual;

  function initializeNextSlice(uint256 _fundableAt) external virtual;

  function totalJuniorDeposits() external view virtual returns (uint256);

  function drawdown(uint256 amount) external virtual;

  function setFundableAt(uint256 timestamp) external virtual;

  function deposit(uint256 tranche, uint256 amount) external virtual returns (uint256 tokenId);

  function assess() external virtual;

  function depositWithPermit(
    uint256 tranche,
    uint256 amount,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external virtual returns (uint256 tokenId);

  function availableToWithdraw(
    uint256 tokenId
  ) external view virtual returns (uint256 interestRedeemable, uint256 principalRedeemable);

  function withdraw(
    uint256 tokenId,
    uint256 amount
  ) external virtual returns (uint256 interestWithdrawn, uint256 principalWithdrawn);

  function withdrawMax(
    uint256 tokenId
  ) external virtual returns (uint256 interestWithdrawn, uint256 principalWithdrawn);

  function withdrawMultiple(
    uint256[] calldata tokenIds,
    uint256[] calldata amounts
  ) external virtual;

  function numSlices() external view virtual returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.12;
pragma experimental ABIEncoderV2;

import {ICreditLine} from "./ICreditLine.sol";

abstract contract IV2CreditLine is ICreditLine {
  function principal() external view virtual returns (uint256);

  function totalInterestAccrued() external view virtual returns (uint256);

  function termStartTime() external view virtual returns (uint256);

  function setLimit(uint256 newAmount) external virtual;

  function setMaxLimit(uint256 newAmount) external virtual;

  function setBalance(uint256 newBalance) external virtual;

  function setPrincipal(uint256 _principal) external virtual;

  function setTotalInterestAccrued(uint256 _interestAccrued) external virtual;

  function drawdown(uint256 amount) external virtual;

  function assess() external virtual returns (uint256, uint256, uint256);

  function initialize(
    address _config,
    address owner,
    address _borrower,
    uint256 _limit,
    uint256 _interestApr,
    uint256 _paymentPeriodInDays,
    uint256 _termInDays,
    uint256 _lateFeeApr,
    uint256 _principalGracePeriodInDays
  ) public virtual;

  function setTermEndTime(uint256 newTermEndTime) external virtual;

  function setNextDueTime(uint256 newNextDueTime) external virtual;

  function setInterestOwed(uint256 newInterestOwed) external virtual;

  function setPrincipalOwed(uint256 newPrincipalOwed) external virtual;

  function setInterestAccruedAsOf(uint256 newInterestAccruedAsOf) external virtual;

  function setWritedownAmount(uint256 newWritedownAmount) external virtual;

  function setLastFullPaymentTime(uint256 newLastFullPaymentTime) external virtual;

  function setLateFeeApr(uint256 newLateFeeApr) external virtual;
}

pragma solidity >=0.6.0;

// This file copied from OZ, but with the version pragma updated to use >=.

/**
 * @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);
}

pragma solidity >=0.6.2;

// This file copied from OZ, but with the version pragma updated to use >= & reference other >= pragma interfaces.
// NOTE: Modified to reference our updated pragma version of IERC165
import "./IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
  event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
  event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
  event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

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

  /**
   * @dev Returns the owner of the NFT specified by `tokenId`.
   */
  function ownerOf(uint256 tokenId) external view returns (address owner);

  /**
   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
   * another (`to`).
   *
   *
   *
   * Requirements:
   * - `from`, `to` cannot be zero.
   * - `tokenId` must be owned by `from`.
   * - If the caller is not `from`, it must be have been allowed to move this
   * NFT by either {approve} or {setApprovalForAll}.
   */
  function safeTransferFrom(address from, address to, uint256 tokenId) external;

  /**
   * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
   * another (`to`).
   *
   * Requirements:
   * - If the caller is not `from`, it must be approved to move this NFT by
   * either {approve} or {setApprovalForAll}.
   */
  function transferFrom(address from, address to, uint256 tokenId) external;

  function approve(address to, uint256 tokenId) external;

  function getApproved(uint256 tokenId) external view returns (address operator);

  function setApprovalForAll(address operator, bool _approved) external;

  function isApprovedForAll(address owner, address operator) external view returns (bool);

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

pragma solidity >=0.6.2;

// This file copied from OZ, but with the version pragma updated to use >=.

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

  function tokenOfOwnerByIndex(
    address owner,
    uint256 index
  ) external view returns (uint256 tokenId);

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

pragma solidity >=0.6.2;

// This file copied from OZ, but with the version pragma updated to use >=.

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

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

  function tokenURI(uint256 tokenId) external view returns (string memory);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.16;

library Arrays {
  /**
   * @notice Removes an item from an array and replaces it with the (previously) last element in the array so
   *  there are no empty spaces. Assumes that `array` is not empty and index is valid.
   * @param array the array to remove from
   * @param index index of the item to remove
   * @return newLength length of the resulting array
   * @return replaced whether or not the index was replaced. Only false if the removed item was the last item
   *  in the array.
   */
  function reorderingRemove(
    uint256[] storage array,
    uint256 index
  ) internal returns (uint256 newLength, bool replaced) {
    newLength = array.length - 1;
    replaced = newLength != index;

    if (replaced) {
      array[index] = array[newLength];
    }

    array.pop();
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.16;

library FiduConversions {
  uint256 internal constant FIDU_MANTISSA = 1e18;
  uint256 internal constant USDC_MANTISSA = 1e6;
  uint256 internal constant USDC_TO_FIDU_MANTISSA = FIDU_MANTISSA / USDC_MANTISSA;
  uint256 internal constant FIDU_USDC_CONVERSION_DECIMALS = USDC_TO_FIDU_MANTISSA * FIDU_MANTISSA;

  /**
   * @notice Convert Usdc to Fidu using a given share price
   * @param usdcAmount amount of usdc to convert
   * @param sharePrice share price to use to convert
   * @return fiduAmount converted fidu amount
   */
  function usdcToFidu(uint256 usdcAmount, uint256 sharePrice) internal pure returns (uint256) {
    return sharePrice > 0 ? (usdcAmount * FIDU_USDC_CONVERSION_DECIMALS) / sharePrice : 0;
  }

  /**
   * @notice Convert fidu to USDC using a given share price
   * @param fiduAmount fidu amount to convert
   * @param sharePrice share price to do the conversion with
   * @return usdcReceived usdc that will be received after converting
   */
  function fiduToUsdc(uint256 fiduAmount, uint256 sharePrice) internal pure returns (uint256) {
    return (fiduAmount * sharePrice) / FIDU_USDC_CONVERSION_DECIMALS;
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.16;

library Epochs {
  uint256 internal constant EPOCH_SECONDS = 7 days;

  /**
   * @notice Get the epoch containing the timestamp `s`
   * @param s the timestamp
   * @return corresponding epoch
   */
  function fromSeconds(uint256 s) internal pure returns (uint256) {
    return s / EPOCH_SECONDS;
  }

  /**
   * @notice Get the current epoch for the block.timestamp
   * @return current epoch
   */
  function current() internal view returns (uint256) {
    return fromSeconds(block.timestamp);
  }

  /**
   * @notice Get the start timestamp for the current epoch
   * @return current epoch start timestamp
   */
  function currentEpochStartTimestamp() internal view returns (uint256) {
    return startOf(current());
  }

  /**
   * @notice Get the previous epoch given block.timestamp
   * @return previous epoch
   */
  function previous() internal view returns (uint256) {
    return current() - 1;
  }

  /**
   * @notice Get the next epoch given block.timestamp
   * @return next epoch
   */
  function next() internal view returns (uint256) {
    return current() + 1;
  }

  /**
   * @notice Get the Unix timestamp of the start of `epoch`
   * @param epoch the epoch
   * @return unix timestamp
   */
  function startOf(uint256 epoch) internal pure returns (uint256) {
    return epoch * EPOCH_SECONDS;
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.16;

import {Epochs} from "./Epochs.sol";

/// @dev Epoch Awareness
/// The Membership system relies on an epoch structure to incentivize economic behavior. Deposits
/// are tracked by epoch and only count toward yield enhancements if they have been present for
/// an entire epoch. This means positions have a specific lifetime:
/// 1. Deposit Epoch - Positions are in the membership system but do not count for rewards as they
///      were not in since the beginning of the epoch. Deposits are externally triggered.
/// 2. Eligible Epoch - Positions are in the membership system and count for rewards as they have been
///      present the entire epoch.
/// 3. Withdrawal Epoch - Positions are no longer in the membership system and forfeit their rewards
///      for the withdrawal epoch. Rewards are forfeited as the position was not present for the
///      entire epoch when withdrawn. Withdrawals are externally triggered.
///
/// All of these deposits' value is summed together to calculate the yield enhancement. A naive
/// approach is, for every summation query, iterate over all deposits and check if they were deposited
/// in the current epoch (so case (1)) or in a previous epoch (so case (2)). This has a high gas
/// cost, so we use another approach: UserEpochTotal.
///
/// UserEpochTotal is the total of the user's deposits as of its lastEpochUpdate- the last epoch that
/// the total was updated in. For that epoch, it tracks:
/// 1. Eligible Amount - The sum of deposits that are in their Eligible Epoch for the current epoch
/// 2. Total Amount - The sum of deposits that will be in their Eligible Epoch for the next epoch
///
/// It is not necessary to track previous epochs as deposits in those will already be eligible, or they
/// will have been withdrawn and already affected the eligible amount.
///
/// It is also unnecessary to track future epochs beyond the next one. Any deposit in the current epoch
/// will become eligible in the next epoch. It is not possible to have a deposit (or withdrawal) take
/// effect any further in the future.

struct UserEpochTotal {
  /// Total amount that will be eligible for membership, after `checkpointedAt` epoch
  uint256 totalAmount;
  /// Amount eligible for membership, as of `checkpointedAt` epoch
  uint256 eligibleAmount;
  /// Last epoch the total was checkpointed at
  uint256 checkpointedAt;
}

library UserEpochTotals {
  error InvalidDepositEpoch(uint256 epoch);

  /// @notice Record an increase of `amount` in the `total`. This is counted toward the
  ///  nextAmount as deposits must be present for an entire epoch to be valid.
  /// @param total storage pointer to the UserEpochTotal
  /// @param amount amount to increase the total by
  function recordIncrease(UserEpochTotal storage total, uint256 amount) internal {
    _checkpoint(total);

    total.totalAmount += amount;
  }

  /// @notice Record an increase of `amount` instantly based on the time of the deposit.
  ///  This is counted either:
  ///  1. To just the totalAmount if the deposit was this epoch
  ///  2. To both the totalAmount and eligibleAmount if the deposit was before this epoch
  /// @param total storage pointer to the UserEpochTotal
  /// @param amount amount to increase the total by
  function recordInstantIncrease(
    UserEpochTotal storage total,
    uint256 amount,
    uint256 depositTimestamp
  ) internal {
    uint256 depositEpoch = Epochs.fromSeconds(depositTimestamp);
    if (depositEpoch > Epochs.current()) revert InvalidDepositEpoch(depositEpoch);

    _checkpoint(total);

    if (depositEpoch < Epochs.current()) {
      // If this was deposited earlier, then it also counts towards eligible
      total.eligibleAmount += amount;
    }

    total.totalAmount += amount;
  }

  /// @notice Record a decrease of `amount` in the `total`. Depending on the `depositTimestamp`
  ///  this will withdraw from the total's currentAmount (if it's withdrawn from an already valid deposit)
  ///  or from the total's nextAmount (if it's withdrawn from a deposit this epoch).
  /// @param total storage pointer to the UserEpochTotal
  /// @param amount amount to decrease the total by
  /// @param depositTimestamp timestamp of the deposit associated with `amount`
  function recordDecrease(
    UserEpochTotal storage total,
    uint256 amount,
    uint256 depositTimestamp
  ) internal {
    uint256 depositEpoch = Epochs.fromSeconds(depositTimestamp);
    if (depositEpoch > Epochs.current()) revert InvalidDepositEpoch(depositEpoch);

    _checkpoint(total);

    total.totalAmount -= amount;

    if (depositEpoch < Epochs.current()) {
      // If this was deposited earlier, then it would have been promoted in _checkpoint and must be removed.
      total.eligibleAmount -= amount;
    }
  }

  /// @notice Get the up-to-date current and next amount for the `_total`. UserEpochTotals
  ///  may have a lastEpochUpdate of long ago. This returns the current and next amounts as if it had
  ///  been checkpointed just now.
  /// @param _total storage pointer to the UserEpochTotal
  /// @return current the currentAmount of the UserEpochTotal
  /// @return next the nextAmount of the UserEpochTotal
  function getTotals(
    UserEpochTotal storage _total
  ) internal view returns (uint256 current, uint256 next) {
    UserEpochTotal memory total = _total;
    if (Epochs.current() == total.checkpointedAt) {
      return (total.eligibleAmount, total.totalAmount);
    }

    return (total.totalAmount, total.totalAmount);
  }

  //////////////////////////////////////////////////////////////////
  // Private

  function _checkpoint(UserEpochTotal storage total) private {
    // Only promote the total amount if we've moved to the next epoch
    // after the last checkpoint.
    if (Epochs.current() <= total.checkpointedAt) return;

    total.eligibleAmount = total.totalAmount;

    total.checkpointedAt = Epochs.current();
  }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.16;

import "@openzeppelin/contracts-upgradeable/interfaces/IERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/interfaces/IERC721Upgradeable.sol";

import {Context} from "../../../../cake/Context.sol";
import {CapitalAssetType} from "../../../../interfaces/ICapitalLedger.sol";
import "../../../../cake/Routing.sol" as Routing;

/// @dev Adding a New Asset Type
/// 1. Create a new library in this directory of the name <AssetType>Asset.sol
/// 2. The library must implement the same functions as the other assets:
///   2.1 AssetType
///   2.2 isType
///   2.3 isValid - if the asset is an ERC721
///   2.4 getUsdcEquivalent
/// 3. Import the library below in "Supported assets"
/// 4. Add the new library to the corresponding `getSupportedType` function in this file
/// 5. Add the new library to the corresponding `getUsdcEquivalent` function in this file
/// 6. If the new library is an ERC721, add it to the `isValid` function in this file

// Supported assets
import {PoolTokensAsset} from "./PoolTokensAsset.sol";
import {StakedFiduAsset} from "./StakedFiduAsset.sol";

using Routing.Context for Context;

library CapitalAssets {
  /// Thrown when an asset has been requested that does not exist
  error InvalidAsset(address assetAddress);
  /// Thrown when an asset has been requested that does not exist
  error InvalidAssetWithId(address assetAddress, uint256 assetTokenId);

  /**
   * @notice Check if a specific `assetAddress` has a corresponding capital asset
   *  implementation and returns the asset type. Returns INVALID if no
   *  such asset exists.
   * @param context goldfinch context for routing
   * @param assetAddress the address of the asset's contract
   * @return type of the asset
   */
  function getSupportedType(
    Context context,
    address assetAddress
  ) internal view returns (CapitalAssetType) {
    if (StakedFiduAsset.isType(context, assetAddress)) return StakedFiduAsset.AssetType;
    if (PoolTokensAsset.isType(context, assetAddress)) return PoolTokensAsset.AssetType;

    return CapitalAssetType.INVALID;
  }

  //////////////////////////////////////////////////////////////////
  // ERC721

  /**
   * @notice Check if a specific token for a supported asset is valid or not. Returns false
   *  if the asset is not supported or the token is invalid
   * @param context goldfinch context for routing
   * @param assetAddress the address of the asset's contract
   * @param assetTokenId the token id
   * @return whether or not a specific token id of asset address is supported
   */
  function isValid(
    Context context,
    address assetAddress,
    uint256 assetTokenId
  ) internal view returns (bool) {
    if (StakedFiduAsset.isType(context, assetAddress))
      return StakedFiduAsset.isValid(context, assetTokenId);
    if (PoolTokensAsset.isType(context, assetAddress))
      return PoolTokensAsset.isValid(context, assetTokenId);

    return false;
  }

  /**
   * @notice Get the point-in-time USDC equivalent value of the ERC721 asset. This
   *  specifically attempts to return the "principle" or "at-risk" USDC value of
   *  the asset and does not include rewards, interest, or other benefits.
   * @param context goldfinch context for routing
   * @param asset ERC721 to evaluate
   * @param assetTokenId id of the token to evaluate
   * @return USDC equivalent value
   */
  function getUsdcEquivalent(
    Context context,
    IERC721Upgradeable asset,
    uint256 assetTokenId
  ) internal view returns (uint256) {
    if (PoolTokensAsset.isType(context, address(asset))) {
      return PoolTokensAsset.getUsdcEquivalent(context, assetTokenId);
    }

    if (StakedFiduAsset.isType(context, address(asset))) {
      return StakedFiduAsset.getUsdcEquivalent(context, assetTokenId);
    }

    revert InvalidAsset(address(asset));
  }

  /**
   * @notice Harvests the associated rewards, interest, and other accrued assets
   *  associated with the asset token. For example, if given a PoolToken asset,
   *  this will collect the GFI rewards (if available), redeemable interest, and
   *  redeemable principal, and send that to the `owner`.
   * @param context goldfinch context for routing
   * @param owner address to send the harvested assets to
   * @param asset ERC721 to harvest
   * @param assetTokenId id of the token to harvest
   */
  function harvest(
    Context context,
    address owner,
    IERC721Upgradeable asset,
    uint256 assetTokenId
  ) internal {
    if (PoolTokensAsset.isType(context, address(asset))) {
      return PoolTokensAsset.harvest(context, owner, assetTokenId);
    }

    if (StakedFiduAsset.isType(context, address(asset))) {
      return StakedFiduAsset.harvest(context, owner, assetTokenId);
    }

    revert InvalidAsset(address(asset));
  }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.16;

import "@openzeppelin/contracts-upgradeable/interfaces/IERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/interfaces/IERC721Upgradeable.sol";
// solhint-disable-next-line max-line-length
import {SafeERC20Upgradeable as SafeERC20} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";

import {Context} from "../../../../cake/Context.sol";
import "../../../../cake/Routing.sol" as Routing;

import {CapitalAssetType} from "../../../../interfaces/ICapitalLedger.sol";
import {IPoolTokens} from "../../../../interfaces/IPoolTokens.sol";

import {ITranchedPool} from "../../../../interfaces/ITranchedPool.sol";

using Routing.Context for Context;
using SafeERC20 for IERC20Upgradeable;

library PoolTokensAsset {
  /// Thrown when trying to harvest a pool token when not go-listed
  error NotGoListed(address owner);

  CapitalAssetType public constant AssetType = CapitalAssetType.ERC721;

  /**
   * @notice Get the type of asset that this contract adapts.
   * @return the asset type
   */
  function isType(Context context, address assetAddress) internal view returns (bool) {
    return assetAddress == address(context.poolTokens());
  }

  /**
   * @notice Get whether or not the given asset is valid
   * @return true if the represented tranche is or may be drawn down (so true if assets are doing work)
   */
  function isValid(Context context, uint256 assetTokenId) internal view returns (bool) {
    IPoolTokens.TokenInfo memory tokenInfo = context.poolTokens().getTokenInfo(assetTokenId);
    ITranchedPool tranchedPool = ITranchedPool(tokenInfo.pool);

    return tranchedPool.getTranche(tokenInfo.tranche).lockedUntil != 0;
  }

  /**
   * @notice Get the point-in-time USDC equivalent value of the Pool Token asset. This
   *  specifically attempts to return the "principle" or "at-risk" USDC value of
   *  the asset and does not include rewards, interest, or other benefits.
   * @param context goldfinch context for routing
   * @param assetTokenId tokenId of the Pool Token to evaluate
   * @return USDC equivalent value
   */
  function getUsdcEquivalent(
    Context context,
    uint256 assetTokenId
  ) internal view returns (uint256) {
    IPoolTokens.TokenInfo memory tokenInfo = context.poolTokens().getTokenInfo(assetTokenId);
    return tokenInfo.principalAmount - tokenInfo.principalRedeemed;
  }

  /**
   * @notice Harvest GFI rewards and redeemable interest and principal on PoolToken with id
   *  `assetTokenId` and send the harvested assets to `owner`.
   * @param context goldfinch context for routing
   * @param owner address to send the harvested assets to
   * @param assetTokenId id of the position to harvest
   */
  function harvest(Context context, address owner, uint256 assetTokenId) internal {
    IPoolTokens.TokenInfo memory tokenInfo = context.poolTokens().getTokenInfo(assetTokenId);
    ITranchedPool tranchedPool = ITranchedPool(tokenInfo.pool);

    if (!context.go().goOnlyIdTypes(owner, getAllowedUIDs(tokenInfo.pool))) {
      revert NotGoListed(owner);
    }

    (uint256 interestWithdrawn, uint256 principalWithdrawn) = tranchedPool.withdrawMax(
      assetTokenId
    );
    context.usdc().safeTransfer(owner, interestWithdrawn + principalWithdrawn);

    try context.backerRewards().withdraw(assetTokenId) returns (uint256 rewards) {
      // Withdraw can throw if the pool is late or if it's an early pool and doesn't
      // have associated backer rewards. Try/catch so the interest and principal can
      // still be harvested.

      context.gfi().safeTransfer(owner, rewards);
    } catch {}
  }

  function getAllowedUIDs(address poolAddress) private view returns (uint256[] memory allowedUIDs) {
    // TranchedPools are non-upgradeable and have different capabilites. One of the differences
    // is the `getAllowedUIDTypes` function, which is only available in contracts deployed from
    // Nov 2022 onward. To get around this limitation, we hardcode the expected UID requirements
    // based on the pool address for previous contracts. Otherwise, we use the available method.
    // Pools below are listed in chronological order for convenience.

    if (
      poolAddress == 0xefeB69eDf6B6999B0e3f2Fa856a2aCf3bdEA4ab5 || // almavest 3
      poolAddress == 0xaA2ccC5547f64C5dFfd0a624eb4aF2543A67bA65 || // tugende
      poolAddress == 0xc9BDd0D3B80CC6EfE79a82d850f44EC9B55387Ae || // cauris
      poolAddress == 0xe6C30756136e07eB5268c3232efBFBe645c1BA5A || // almavest 4
      poolAddress == 0x1d596D28A7923a22aA013b0e7082bbA23DAA656b // almavest 5
    ) {
      // Legacy pools that had custom checks upon signup

      allowedUIDs = new uint256[](1);
      allowedUIDs[0] = 0;
      return allowedUIDs;
    }

    if (poolAddress == 0x418749e294cAbce5A714EfcCC22a8AAde6F9dB57 /* almavest 6 */) {
      // Old pool that has internal UID check but does not provide a gas-efficient UID interface
      // Copied the pool's UID requirements below

      allowedUIDs = new uint256[](1);
      allowedUIDs[0] = 0;
      return allowedUIDs;
    }

    if (
      poolAddress == 0x00c27FC71b159a346e179b4A1608a0865e8A7470 || // stratos
      poolAddress == 0xd09a57127BC40D680Be7cb061C2a6629Fe71AbEf // cauris 2
    ) {
      // Old pools that have internal UID check but do not provide a gas-efficient UID interface
      // Copied the pools' UID requirements below

      allowedUIDs = new uint256[](2);
      allowedUIDs[0] = 0;
      allowedUIDs[1] = 1;
      return allowedUIDs;
    }

    if (
      poolAddress == 0xb26B42Dd5771689D0a7faEea32825ff9710b9c11 || // lend east 1
      poolAddress == 0x759f097f3153f5d62FF1C2D82bA78B6350F223e3 || // almavest 7
      poolAddress == 0x89d7C618a4EeF3065DA8ad684859a547548E6169 // addem capital
    ) {
      // Old pools that have internal UID check but do not provide a gas-efficient UID interface
      // Copied the pools' UID requirements below

      allowedUIDs = new uint256[](4);
      allowedUIDs[0] = 0;
      allowedUIDs[1] = 1;
      allowedUIDs[2] = 3;
      allowedUIDs[3] = 4;
      return allowedUIDs;
    }

    // All other and future pools implement getAllowedUIDTypes
    return ITranchedPool(poolAddress).getAllowedUIDTypes();
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.16;

import "@openzeppelin/contracts-upgradeable/interfaces/IERC20Upgradeable.sol";
// solhint-disable-next-line max-line-length
import {SafeERC20Upgradeable as SafeERC20} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";

import "../../../../library/FiduConversions.sol";
import {Context} from "../../../../cake/Context.sol";
import "../../../../cake/Routing.sol" as Routing;

import {CapitalAssetType} from "../../../../interfaces/ICapitalLedger.sol";
import {IStakingRewards, StakedPositionType} from "../../../../interfaces/IStakingRewards.sol";
import {ISeniorPool} from "../../../../interfaces/ISeniorPool.sol";

using Routing.Context for Context;
using SafeERC20 for IERC20Upgradeable;

library StakedFiduAsset {
  CapitalAssetType public constant AssetType = CapitalAssetType.ERC721;

  /**
   * @notice Get the type of asset that this contract adapts.
   * @return the asset type
   */
  function isType(Context context, address assetAddress) internal view returns (bool) {
    return assetAddress == address(context.stakingRewards());
  }

  /**
   * @notice Get whether or not the given asset is valid
   * @return true if the asset is Fidu type (not CurveLP)
   */
  function isValid(Context context, uint256 assetTokenId) internal view returns (bool) {
    return
      context.stakingRewards().getPosition(assetTokenId).positionType == StakedPositionType.Fidu;
  }

  /**
   * @notice Get the point-in-time USDC equivalent value of the ERC721 asset. This
   *  specifically attempts to return the "principle" or "at-risk" USDC value of
   *  the asset and does not include rewards, interest, or other benefits.
   * @param context goldfinch context for routing
   * @param assetTokenId id of the position to evaluate
   * @return USDC equivalent value
   */
  function getUsdcEquivalent(
    Context context,
    uint256 assetTokenId
  ) internal view returns (uint256) {
    uint256 stakedFiduBalance = context.stakingRewards().stakedBalanceOf(assetTokenId);
    return FiduConversions.fiduToUsdc(stakedFiduBalance, context.seniorPool().sharePrice());
  }

  /**
   * @notice Harvest GFI rewards on a staked fidu token and send them to `owner`.
   * @param context goldfinch context for routing
   * @param owner address to send the GFI to
   * @param assetTokenId id of the position to harvest
   */
  function harvest(Context context, address owner, uint256 assetTokenId) internal {
    // Sends reward to owner (this contract)
    uint256 reward = context.stakingRewards().getReward(assetTokenId);

    if (reward > 0) {
      context.gfi().safeTransfer(owner, reward);
    }
  }
}

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000d16bc944bf20c86c4ed47ce1a330a18538674c83

-----Decoded View---------------
Arg [0] : _context (address): 0xd16BC944Bf20c86c4ED47Ce1a330a18538674C83

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000d16bc944bf20c86c4ed47ce1a330a18538674c83