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// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity =0.8.21;

import {IOracle} from "./Interface.sol";
import {StableSwapNGOracle} from "./StableSwapNGOracle.sol";

/**
 * @title StableSwapNGOracleFactory
 * @notice Factory contract for deploying StableSwapNGOracle instances.
 */
contract StableSwapNGOracleFactory {
    /**
     * @notice Returns the name of the factory.
     * @return name The factory name string.
     */
    function name() external pure returns (string memory) {
        return "StableSwapNG LP Oracle Factory";
    }

    /**
     * @notice Deploys a new StableSwapNGOracle instance.
     * @param _pool Address of the Curve StableSwap NG pool.
     * @param _feedAsset0 Chainlink feed for the first underlying asset vs USD.
     * @param _feedAsset1 Chainlink feed for the second underlying asset vs USD.
     * @param _feedUsdc Chainlink feed for USDC vs USD.
     * @return oracle The address of the newly deployed StableSwapNGOracle.
     */
    function newStableSwapNGOracle(address _pool, address _feedAsset0, address _feedAsset1, address _feedUsdc)
        external
        returns (IOracle)
    {
        // Deploy a new oracle instance with the provided parameters
        return new StableSwapNGOracle(_pool, _feedAsset0, _feedAsset1, _feedUsdc);
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity =0.8.21;

interface IERC20 {
    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    function decimals() external view returns (uint8);
}

/**
 * @dev Curve StableSwap-NG interface
 */
interface ICurveStableSwapNG is IERC20 {
    function coins(uint256 i) external view returns (address);
    function get_virtual_price() external view returns (uint256);
}

/**
 * @dev Chainlink's data feed interface
 */
interface AggregatorV3Interface {
    function latestRoundData()
        external
        view
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound);
    function decimals() external view returns (uint8);
}

interface IOracle {
    /**
     * Returns the price of 1 asset of collateral token quoted in 1 asset of loan token, scaled by 1e36.
     *
     * It corresponds to the price of 10**(collateral token decimals) assets of collateral token quoted in 10 **(loan token decimals) assets of loan token with 36 + loan token decimals - collateral token decimals decimals of precision.
     */
    function price() external view returns (uint256);
}

interface IERC4626 is IERC20 {
    /**
     * @dev Returns the address of the underlying token used for the Vault for accounting, depositing, and withdrawing.
     *
     * - MUST be an ERC-20 token contract.
     * - MUST NOT revert.
     */
    function asset() external view returns (address assetTokenAddress);

    /**
     * @dev Returns the amount of shares that the Vault would exchange for the amount of assets provided, in an ideal
     * scenario where all the conditions are met.
     *
     * - MUST NOT be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT show any variations depending on the caller.
     * - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange.
     * - MUST NOT revert.
     *
     * NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the
     * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and
     * from.
     */
    function convertToShares(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Returns the amount of assets that the Vault would exchange for the amount of shares provided, in an ideal
     * scenario where all the conditions are met.
     *
     * - MUST NOT be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT show any variations depending on the caller.
     * - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange.
     * - MUST NOT revert.
     *
     * NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the
     * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and
     * from.
     */
    function convertToAssets(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their deposit at the current block, given
     * current on-chain conditions.
     *
     * - MUST return as close to and no more than the exact amount of Vault shares that would be minted in a deposit
     *   call in the same transaction. I.e. deposit should return the same or more shares as previewDeposit if called
     *   in the same transaction.
     * - MUST NOT account for deposit limits like those returned from maxDeposit and should always act as though the
     *   deposit would be accepted, regardless if the user has enough tokens approved, etc.
     * - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToShares and previewDeposit SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by depositing.
     */
    function previewDeposit(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their mint at the current block, given
     * current on-chain conditions.
     *
     * - MUST return as close to and no fewer than the exact amount of assets that would be deposited in a mint call
     *   in the same transaction. I.e. mint should return the same or fewer assets as previewMint if called in the
     *   same transaction.
     * - MUST NOT account for mint limits like those returned from maxMint and should always act as though the mint
     *   would be accepted, regardless if the user has enough tokens approved, etc.
     * - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToAssets and previewMint SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by minting.
     */
    function previewMint(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their withdrawal at the current block,
     * given current on-chain conditions.
     *
     * - MUST return as close to and no fewer than the exact amount of Vault shares that would be burned in a withdraw
     *   call in the same transaction. I.e. withdraw should return the same or fewer shares as previewWithdraw if
     *   called
     *   in the same transaction.
     * - MUST NOT account for withdrawal limits like those returned from maxWithdraw and should always act as though
     *   the withdrawal would be accepted, regardless if the user has enough shares, etc.
     * - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToShares and previewWithdraw SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by depositing.
     */
    function previewWithdraw(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their redeemption at the current block,
     * given current on-chain conditions.
     *
     * - MUST return as close to and no more than the exact amount of assets that would be withdrawn in a redeem call
     *   in the same transaction. I.e. redeem should return the same or more assets as previewRedeem if called in the
     *   same transaction.
     * - MUST NOT account for redemption limits like those returned from maxRedeem and should always act as though the
     *   redemption would be accepted, regardless if the user has enough shares, etc.
     * - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToAssets and previewRedeem SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by redeeming.
     */
    function previewRedeem(uint256 shares) external view returns (uint256 assets);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity =0.8.21;

import {AggregatorV3Interface, IOracle, ICurveStableSwapNG, IERC20, IERC4626} from "./Interface.sol";

/**
 * @title StableSwapNGOracle
 * @notice Oracle providing the price of a Curve StableSwap NG LP token in USD,
 *         scaled by 1e36. It calculates the LP token value based on the underlying
 *         asset balances (fetched via POOL.balances) and their Chainlink prices.
 */
contract StableSwapNGOracle is IOracle {
    // --- State Variables ---
    /// @notice Address of the Curve StableSwap NG pool.
    ICurveStableSwapNG public immutable POOL;
    /// @notice ERC-4626 share token of first underlying asset (e.g., sUSDe)
    IERC4626 public immutable SHARE_0;
    /// @notice ERC-4626 share token of second underlying asset (e.g., sUSDS)
    IERC4626 public immutable SHARE_1;

    /// @notice Chainlink feed for the first underlying asset vs USD (e.g., USDe/USD).
    AggregatorV3Interface public immutable FEED_ASSET_0;
    /// @notice Chainlink feed for the second underlying asset vs USD (e.g., USDS/USD).
    AggregatorV3Interface public immutable FEED_ASSET_1;
    /// @notice Chainlink feed for USDC vs USD.
    AggregatorV3Interface public immutable FEED_USDC;

    // --- Constructor ---
    constructor(address _pool, address _feedAsset0, address _feedAsset1, address _feedUsdc) {
        POOL = ICurveStableSwapNG(_pool);
        FEED_ASSET_0 = AggregatorV3Interface(_feedAsset0);
        FEED_ASSET_1 = AggregatorV3Interface(_feedAsset1);
        FEED_USDC = AggregatorV3Interface(_feedUsdc);

        SHARE_0 = IERC4626(POOL.coins(0));
        SHARE_1 = IERC4626(POOL.coins(1));

        // Check for feed decimals
        require(FEED_ASSET_0.decimals() == 8, "Feed 0 decimals != 8");
        require(FEED_ASSET_1.decimals() == 8, "Feed 1 decimals != 8");
        require(FEED_USDC.decimals() == 8, "Feed USDC decimals != 8");
    }

    /**
     * @notice Returns the price of the LP token in USDC, scaled by 1e36
     * @dev Fetches underlying balances, gets their USD prices from Chainlink,
     *      calculates total USD value, derives per-LP-token USD value,
     *      and converts it to USDC value using the USDC/USD feed.
     * @return price The price of one LP token unit in USDC, scaled by 1e36.
     */
    function price() external view returns (uint256) {
        uint256 asset0Price = _getChainlinkPrice(FEED_ASSET_0, 86400); // Decimals: 8
        uint256 asset1Price = _getChainlinkPrice(FEED_ASSET_1, 86400); // Decimals: 8

        uint256 lpPrice = POOL.get_virtual_price() * (asset0Price < asset1Price ? asset0Price : asset1Price); // Decimals: 18+8=26

        uint256 usdcPrice = _getChainlinkPrice(FEED_USDC, 86400); // Decimals: 8

        // Calculate the price of the LP token in USDC (scaled by 1e36)
        uint256 lpUsdcPrice = (lpPrice * 1e18) / usdcPrice; // Decimals: 26+18-8=36

        return lpUsdcPrice;
    }

    /**
     * @notice Fetches the latest price from a Chainlink feed with validation.
     * @dev Reverts if the price is invalid (<= 0) or too old (older than heartbeat).
     * @param feed The Chainlink AggregatorV3Interface address.
     * @param heartbeat The maximum allowed age of the price feed update in seconds.
     * @return price The latest price from the feed, assuming 8 decimals.
     */
    function _getChainlinkPrice(AggregatorV3Interface feed, uint256 heartbeat) internal view returns (uint256) {
        (, int256 answer,, uint256 updatedAt,) = feed.latestRoundData();
        require(answer > 0, "Invalid price");
        require(block.timestamp - updatedAt < heartbeat, "Price too old");
        return uint256(answer); // Price has 8 decimals
    }
}

{
  "remappings": [
    "@openzeppelin-contracts/=dependencies/@openzeppelin-contracts-5.2.0/",
    "forge-std/=dependencies/forge-std-1.9.6/",
    "morpho-blue/=dependencies/morpho-blue-1.0.0/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "shanghai",
  "viaIR": false,
  "libraries": {}
}

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