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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/Multicall.sol";
import {DataTypes} from "../libraries/DataTypes.sol";
import {IERC20Decimals} from "../interfaces/IERC20Decimals.sol";
import {Errors} from "../libraries/Errors.sol";
import {ILoanTaker} from "../interfaces/ILoanTaker.sol";
import {IIntentStrategy} from "../interfaces/IIntentStrategy.sol";
import {IRegistryV2} from "./interfaces/IRegistryV2.sol";
import {IDLV} from "./interfaces/IDLV.sol";

/**
 * IDEA: Make a lender vault with only one intent at any given time
 * this intent has a strike price coming from another "strategy" contract
 * that relies on an oracle to get spot price of a token and applying
 * a discount factor on it.
 */
contract DelegatedLenderVault is IDLV, ReentrancyGuard, Pausable, Ownable, Multicall {
  using SafeERC20 for IERC20Decimals;

  event CreateLoan(
    address indexed loan,
    address borrower,
    uint256 borrowAmtReceived,
    DataTypes.LoanData data,
    DataTypes.BorrowParams borrowParams
  );
  event Withdraw(address token, uint256 amount);
  event Deposit(uint256 amount);
  event UpgradeLoanImplementation(address newImplementation);

  uint256 internal constant INTEREST_BASE_UNIT = 1e18;

  DataTypes.IntentCollectionV2 internal baseCollection;

  uint8 internal collTokenDecimals;
  bool internal initialized;
  IIntentStrategy public strategy;
  IRegistryV2 public registry;
  address public loanImpl;

  function initialize(address _loanImpl, address _strategy, address _owner) public {
    if (initialized) revert Errors.DLV_AlreadyInitialized();

    initialized = true;
    loanImpl = _loanImpl;
    strategy = IIntentStrategy(_strategy);
    registry = IRegistryV2(msg.sender);

    baseCollection.collToken = strategy.collToken();
    baseCollection.borrowToken = strategy.borrowToken();

    collTokenDecimals = IERC20Decimals(baseCollection.collToken).decimals();

    _transferOwnership(_owner);
  }

  /* -------------------------- Owner only functions -------------------------- */

  /// @notice Pauses the vault
  /// @dev Can only be called by the owner or the pauseGuardian
  function pauseVault() external onlyOwner {
    _pause();
  }

  /// @notice Unpauses the vault
  /// @dev Can only be called by the owner or the unpauseGuardian
  function unpauseVault() external onlyOwner {
    _unpause();
  }

  function withdraw(address token, uint256 amount) external nonReentrant onlyOwner {
    if (amount == 0) revert Errors.ZeroAmtProvided();

    uint256 balance = IERC20Decimals(token).balanceOf(address(this));

    if (amount > balance) revert Errors.AmtExceedsBalance();

    emit Withdraw(token, amount);

    IERC20Decimals(token).safeTransfer(owner(), amount);
  }

  function deposit(uint256 amount) external nonReentrant onlyOwner {
    if (amount == 0) revert Errors.ZeroAmtProvided();

    emit Deposit(amount);

    IERC20Decimals(baseCollection.borrowToken).safeTransferFrom(msg.sender, address(this), amount);
  }

  function upgradeLoanImplementation(address newImplementation) external nonReentrant onlyOwner {
    if (newImplementation == address(0)) revert Errors.ZeroAddressProvided();
    if (newImplementation == loanImpl) revert Errors.DLV_SameLoanImplementation();

    registry.loanImplUpgradeHook(loanImpl, newImplementation);

    emit UpgradeLoanImplementation(newImplementation);

    loanImpl = newImplementation;
  }

  /* --------------------------- Loan creation logic -------------------------- */

  /// @notice Creates a new loan contract and transfers the loan amount to the borrower.
  /// @dev The function first matches the borrow parameters with the intent and calculates the loan amount.
  ///      It then creates a new loan contract and transfers the loan amount to the borrower.
  ///      If the borrower has provided data, it calls the sourceCollateral function on the borrower.
  ///      Finally, it transfers the collateral amount from the borrower to the loan contract.
  /// @param bParams The borrow parameters provided by the borrower.
  /// @param data The data provided by the borrower for sourcing collateral.
  /// @return loanContract The address of the newly created loan contract.
  function createLoan(DataTypes.BorrowParams calldata bParams, bytes calldata data)
    external
    whenNotPaused
    nonReentrant
    returns (address loanContract)
  {
    /// @dev match the borrow parameters with the intent and calculate the loan amount
    (DataTypes.IntentCollectionV2 memory c, uint256 loanAmount) = _matchBorrowParams(bParams);

    /// @dev apply the premium, platformFee on the loan and calculate the amount the borrower should receive
    (uint256 borrowAmtReceived, uint256 takerPlusMakerFee) =
      _getBorrowAmountMinusPremFee(loanAmount, c.intents[0].interestRate);

    if (borrowAmtReceived == 0) revert Errors.InvalidBorrowAmtReceived();

    /// @dev create a new loan
    DataTypes.LoanData memory loanData = DataTypes.LoanData({
      borrower: msg.sender,
      lenderVault: address(this),
      collToken: c.collToken,
      borrowToken: c.borrowToken,
      collAmt: bParams.collAmt,
      borrowAmt: loanAmount,
      repaidAmt: 0,
      expiresAt: block.timestamp + c.intents[0].duration
    });

    /// @dev transfer the borrow amount to the borrower
    IERC20Decimals(c.borrowToken).safeTransfer(msg.sender, borrowAmtReceived); // optimistically transfer tokens

    /// @notice only transfer fee, if there is fee
    if (takerPlusMakerFee > 0) {
      /// @dev transfer the takerPlusMakerFee to registry
      IERC20Decimals(c.borrowToken).safeTransfer(address(registry), takerPlusMakerFee);
    }

    /// @dev deploy the loan contract
    loanContract = registry.deployLoan(loanImpl, loanData);

    emit CreateLoan(loanContract, msg.sender, borrowAmtReceived, loanData, bParams);

    /// @dev if any data is passed, we do a callback to the msg.sender, for sourcing collateral
    if (data.length != 0) {
      ILoanTaker(msg.sender).sourceCollateral(loanContract, data);
    }

    /// @dev transfer the collateral amount from the borrower to the loan contract
    /// @dev in case this fails the entire tx fails, serves as a check too
    IERC20Decimals(c.collToken).safeTransferFrom(msg.sender, loanContract, bParams.collAmt);
  }

  /* --------------------------- Internal Functions --------------------------- */

  /// @notice Matches the borrow parameters with the intent and calculates the loan amount
  /// @dev This function is used to calculate the loan amount based on the borrow parameters and intent
  /// @param bParams The borrow parameters
  /// @return c The intent collection
  /// @return loanAmount The calculated loan amount
  function _matchBorrowParams(DataTypes.BorrowParams calldata bParams)
    internal
    view
    returns (DataTypes.IntentCollectionV2 memory, uint256)
  {
    if (bParams.collectionId != 1) revert Errors.CollectionDoesNotExist();
    if (bParams.intentId != 0) revert Errors.InvalidIntent();

    (bool invalidHealth, DataTypes.IntentCollectionV2 memory c) = getPopulatedCollection();

    if (invalidHealth) revert Errors.StrategyUnhealthy();

    uint256 loanAmount = (bParams.collAmt * c.intents[0].strikePrice) / (10 ** uint256(collTokenDecimals));

    return (c, loanAmount);
  }

  /// @notice Calculates the borrow amount minus the premium fee
  /// @dev This function calculates the amount the borrower will receive after subtracting the premium fee. It also calculates the sum of taker and maker fees.
  /// @param loanAmount The total loan amount
  /// @param interestRate The interest rate for the loan
  /// @return borrowAmtReceived The amount the borrower will receive after subtracting the premium fee
  /// @return takerPlusMakerFee The sum of taker and maker fees
  function _getBorrowAmountMinusPremFee(uint256 loanAmount, uint256 interestRate)
    internal
    view
    returns (uint256 borrowAmtReceived, uint256 takerPlusMakerFee)
  {
    /// @dev calculate the premium on the loan using the interest rate for the tenure
    /// @notice totalPremium is substracted from loanAmount, thus being charged to the borrower.
    /// @notice only taker fee is charged to borrower, not maker fee.
    uint256 totalPremium = (loanAmount * interestRate) / INTEREST_BASE_UNIT;

    (uint256 _makerFee, uint256 _takerFee) = registry.getMakerTakerFee();

    /// @dev calculate the takerFee
    uint256 takerFee = (totalPremium * _takerFee) / INTEREST_BASE_UNIT;

    /// @dev calculate the makerFee
    /// @notice we don't need a check for makerFee > lenderPremium, because makerFee is always <= premium
    uint256 makerFee = (totalPremium * _makerFee) / INTEREST_BASE_UNIT;

    /// @dev add takerFee to totalPremium, since it is charged to borrower
    totalPremium += takerFee;

    /// @dev check if the totalPremium is greater than the loan amount
    if (totalPremium > loanAmount) revert Errors.PremiumGtLoanAmt();

    /// @dev calculate the amount the borrower will receive. loanAmount - totalPremium
    borrowAmtReceived = loanAmount - totalPremium;
    takerPlusMakerFee = takerFee + makerFee;
  }

  function getPopulatedCollection() public view returns (bool invalidHealth, DataTypes.IntentCollectionV2 memory c) {
    DataTypes.Intent[] memory intents = new DataTypes.Intent[](1);

    (invalidHealth, intents[0]) = strategy.getIntentData();

    invalidHealth = invalidHealth || paused();

    c = baseCollection;
    c.intents = intents;
  }

  function collection(uint256 collectionId) external view returns (DataTypes.IntentCollectionV2 memory c) {
    if (collectionId != 1) revert Errors.CollectionDoesNotExist();

    (, c) = getPopulatedCollection();
  }

  function intent(uint256 collectionId, uint256 intentId)
    external
    view
    returns (address, address, bool, DataTypes.Intent memory)
  {
    if (collectionId != 1) revert Errors.CollectionDoesNotExist();
    if (intentId != 0) revert Errors.InvalidIntent();

    (bool invalidHealth, DataTypes.IntentCollectionV2 memory c) = getPopulatedCollection();

    bool isEnabled = !invalidHealth;
    return (c.collToken, c.borrowToken, isEnabled, c.intents[intentId]);
  }

  /* -------------------------- Integratoor's Getters ------------------------- */

  function reentrancyGuardEntered() external view returns (bool) {
    return _reentrancyGuardEntered();
  }
}

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

pragma solidity ^0.8.0;

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

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

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

pragma solidity ^0.8.0;

import "./Address.sol";

/**
 * @dev Provides a function to batch together multiple calls in a single external call.
 *
 * _Available since v4.1._
 */
abstract contract Multicall {
    /**
     * @dev Receives and executes a batch of function calls on this contract.
     * @custom:oz-upgrades-unsafe-allow-reachable delegatecall
     */
    function multicall(bytes[] calldata data) external virtual returns (bytes[] memory results) {
        results = new bytes[](data.length);
        for (uint256 i = 0; i < data.length; i++) {
            results[i] = Address.functionDelegateCall(address(this), data[i]);
        }
        return results;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import {DataTypes} from "./../../libraries/DataTypes.sol";

interface IDLV {
  function initialize(address _loanImpl, address _strategy, address _owner) external;

  function collection(uint256 collectionId) external view returns (DataTypes.IntentCollectionV2 memory);

  function createLoan(DataTypes.BorrowParams calldata borrowParams, bytes calldata data) external returns (address);
}

// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.19;

import {DataTypes} from "./../../libraries/DataTypes.sol";

interface IRegistryV2 {
  function vaultExists(address vault) external view returns (bool);
  function loanExists(address loan) external view returns (bool);

  function makerFee() external view returns (uint256);
  function takerFee() external view returns (uint256);
  function getMakerTakerFee() external view returns (uint256, uint256);

  function deployVault(address strategy) external returns (address);

  function deployLoan(address impl, DataTypes.LoanData calldata loanData) external returns (address);

  function loanImplUpgradeHook(address oldImpl, address newImpl) external view;
}

// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.8.19;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IERC20Decimals is IERC20 {
  function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.19;

import {DataTypes} from "./../libraries/DataTypes.sol";

interface IIntentStrategy {
  function collToken() external view returns (address);
  function borrowToken() external view returns (address);
  function getIntentData() external view returns (bool health, DataTypes.Intent memory intent);
}

// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.19;

interface ILoanTaker {
  function sourceCollateral(address loanContract, bytes calldata data) external;
  function sourcePrincipal(uint256 repayAmt, uint256 reclaimedAmt, bytes calldata data) external;
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

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

pragma solidity ^0.8.0;

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

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

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

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

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        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));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

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

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @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).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // 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 cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

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

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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://consensys.net/diligence/blog/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/v0.8.0/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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or 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 {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.8.19;

library DataTypes {
  struct Intent {
    /// @dev strike price of collateral in borrowAsset units
    /// @notice 1 unit collateral = x unit borrowAsset
    uint256 strikePrice;
    uint256 interestRate;
    // uint256 upfrontFee;
    uint256 duration;
  }

  struct IntentCollection {
    address collToken;
    address borrowToken;
    uint256 minSingleLoanAmt;
    uint256 maxSingleLoanAmt;
    uint256 expiresAt;
    bool isEnabled;
    Intent[] intents;
  }

  struct IntentCollectionV2 {
    address collToken;
    address borrowToken;
    Intent[] intents;
  }

  enum IntentCollectionUpdateType {
    CREATE_COLLECTION,
    EXTEND_COLLECTION,
    SET_STATUS_COLLECTION
  }

  struct BorrowParams {
    uint256 collectionId;
    uint256 intentId;
    uint256 collAmt;
  }

  struct LoanData {
    address borrower;
    address lenderVault;
    address collToken;
    address borrowToken;
    uint256 collAmt;
    uint256 borrowAmt;
    uint256 repaidAmt;
    uint256 expiresAt;
  }

  struct LoanExecParams {
    address vault;
    uint256 collSwapAmount;
    BorrowParams borrowParams;
    address swapper;
    bytes swapperData;
  }

  struct LoanRepayParams {
    address loan;
    address swapper;
    uint256 repayAmount;
    bytes swapperData;
  }
}

// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.8.19;

library Errors {
  error AlreadyInitalized();
  error ZeroAmtProvided();
  error AmtExceedsBalance();
  error LoanAmtTooLow();
  error LoanAmtTooHigh();
  error AmtReceivedTooLow();
  error IntentExpired();
  error LoanExpired();
  error LoanNotExpired();
  error LoanNotFound();
  error NoSeizableAmt();
  error CollectionDoesNotExist();
  error CollectionDisabled();
  error UnAuthorized();
  error InvalidVault();
  error InvalidIntent();
  error IntentDisabled();
  error ZeroAddressProvided();
  error VaultNotFound();
  error InvalidArrayLength();
  error MiddlewareNotWhitelisted();
  error MiddlewareNotAllowed();
  error NoPairExists();
  error CallerNotPair();
  error SenderNotPair();
  error LeverageTooHigh();
  error HandleCreateLoanFailed();
  error CollTokenDoesntMatch();
  error InvalidCaller();
  error NoIntentsProvided();
  error InvalidExpiryProvided();
  error FeeTooHigh();
  error PremiumTooHigh();
  error PremiumGtLoanAmt();
  error StrategyUnhealthy();
  error InvalidLoanAmtRange();
  error InvalidBorrowAmtReceived();

  /// DLV
  error DLV_AlreadyInitialized();
  error DLV_SameLoanImplementation();

  /// registry
  error Registry_FeeTooHigh();
  error Registry_UnknownStrategy();
  error Registry_InvalidConstructor();
  error Registry_UnauthorizedLoanImplementation();
  error Registry_UnauthorizedLoanUpgrade();

  /// pyth wrapper
  error PythWrapper_FeedAlreadyExists();
  error PythWrapper_FeedDoesNotExist();
  error PythWrapper_InvalidTimeTolerance();
  error PythWrapper_InvalidMaxSkew();

  /// strategy
  error Strategy_InvalidConstructor();
  error Strategy_InvalidSpotPriceRange();
  error Strategy_InvalidLoanDuration();
  error Strategy_InvalidInterestRate();
  error Strategy_InvalidAdjustmentFactor();
  error Strategy_InvalidOracle();
  error Strategy_Unauthorized();
}

{
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "appendCBOR": true,
    "bytecodeHash": "ipfs",
    "useLiteralContent": false
  },
  "optimizer": {
    "enabled": true,
    "runs": 1002
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "remappings": [
    "@openzeppelin/=node_modules/@openzeppelin/",
    "@uniswap/=node_modules/@uniswap/",
    "@pythnetwork/pyth-sdk-solidity/=node_modules/@pythnetwork/pyth-sdk-solidity/",
    "base64-sol/=node_modules/base64-sol/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/"
  ],
  "viaIR": false
}

• No Contract Security Audit Submitted- Submit Audit Here

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IRegistryV2","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"strategy","outputs":[{"internalType":"contract IIntentStrategy","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpauseVault","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"}],"name":"upgradeLoanImplementation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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