// 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: 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: GPL-2.0-or-later
pragma solidity >=0.4.0;

/// @title FixedPoint96
/// @notice A library for handling binary fixed point numbers, see https://en.wikipedia.org/wiki/Q_(number_format)
/// @dev Used in SqrtPriceMath.sol
library FixedPoint96 {
    uint8 internal constant RESOLUTION = 96;
    uint256 internal constant Q96 = 0x1000000000000000000000000;
}

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

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

interface IDecentralizedIndex is IERC20 {
  enum IndexType {
    WEIGHTED,
    UNWEIGHTED
  }

  struct Config {
    address partner;
    bool hasTransferTax;
    bool blacklistTKNpTKNPoolV2;
  }

  // all fees: 1 == 0.01%, 10 == 0.1%, 100 == 1%
  struct Fees {
    uint16 burn;
    uint16 bond;
    uint16 debond;
    uint16 buy;
    uint16 sell;
    uint16 partner;
  }

  struct IndexAssetInfo {
    address token;
    uint256 weighting;
    uint256 basePriceUSDX96;
    address c1; // arbitrary contract/address field we can use for an index
    uint256 q1; // arbitrary quantity/number field we can use for an index
  }

  event Create(address indexed newIdx, address indexed wallet);
  event Initialize(address indexed wallet, address v2Pool);
  event Bond(
    address indexed wallet,
    address indexed token,
    uint256 amountTokensBonded,
    uint256 amountTokensMinted
  );
  event Debond(address indexed wallet, uint256 amountDebonded);
  event AddLiquidity(
    address indexed wallet,
    uint256 amountTokens,
    uint256 amountDAI
  );
  event RemoveLiquidity(address indexed wallet, uint256 amountLiquidity);
  event SetPartner(address indexed wallet, address newPartner);
  event SetPartnerFee(address indexed wallet, uint16 newFee);

  function BOND_FEE() external view returns (uint16);

  function DEBOND_FEE() external view returns (uint16);

  function FLASH_FEE_AMOUNT_DAI() external view returns (uint256);

  function PAIRED_LP_TOKEN() external view returns (address);

  function indexType() external view returns (IndexType);

  function created() external view returns (uint256);

  function lpStakingPool() external view returns (address);

  function lpRewardsToken() external view returns (address);

  function partner() external view returns (address);

  function getIdxPriceUSDX96() external view returns (uint256, uint256);

  function isAsset(address token) external view returns (bool);

  function getAllAssets() external view returns (IndexAssetInfo[] memory);

  function getInitialAmount(
    address sToken,
    uint256 sAmount,
    address tToken
  ) external view returns (uint256);

  function getTokenPriceUSDX96(address token) external view returns (uint256);

  function processPreSwapFeesAndSwap() external;

  function bond(address token, uint256 amount, uint256 amountMintMin) external;

  function debond(
    uint256 amount,
    address[] memory token,
    uint8[] memory percentage
  ) external;

  function addLiquidityV2(
    uint256 idxTokens,
    uint256 daiTokens,
    uint256 slippage,
    uint256 deadline
  ) external returns (uint256);

  function removeLiquidityV2(
    uint256 lpTokens,
    uint256 minTokens,
    uint256 minDAI,
    uint256 deadline
  ) external;

  function flash(
    address recipient,
    address token,
    uint256 amount,
    bytes calldata data
  ) external;
}

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

interface IDexAdapter {
  function ASYNC_INITIALIZE() external view returns (bool);

  function V2_ROUTER() external view returns (address);

  function V3_ROUTER() external view returns (address);

  function WETH() external view returns (address);

  function getV3Pool(
    address _token0,
    address _token1,
    int24 _tickSpacing
  ) external view returns (address _pool);

  function getV3Pool(
    address _token0,
    address _token1,
    uint24 _poolFee
  ) external view returns (address _pool);

  function getV2Pool(
    address _token0,
    address _token1
  ) external view returns (address _pool);

  function createV2Pool(
    address _token0,
    address _token1
  ) external returns (address _pool);

  function swapV2Single(
    address _tokenIn,
    address _tokenOut,
    uint256 _amountIn,
    uint256 _amountOutMin,
    address _recipient
  ) external returns (uint256 _amountOut);

  function swapV3Single(
    address _tokenIn,
    address _tokenOut,
    uint24 _fee,
    uint256 _amountIn,
    uint256 _amountOutMin,
    address _recipient
  ) external returns (uint256 _amountOut);

  function addLiquidity(
    address tokenA,
    address tokenB,
    uint256 amountADesired,
    uint256 amountBDesired,
    uint256 amountAMin,
    uint256 amountBMin,
    address to,
    uint256 deadline
  ) external;

  function removeLiquidity(
    address tokenA,
    address tokenB,
    uint256 liquidity,
    uint256 amountAMin,
    uint256 amountBMin,
    address to,
    uint256 deadline
  ) external;

  function extraRewardsHook(
    address _token0,
    address _token1
  ) external returns (address[] memory tokens, uint256[] memory amounts);
}

// 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
pragma solidity ^0.8.19;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

interface IPEAS is IERC20 {
  event Burn(address indexed user, uint256 amount);

  function burn(uint256 amount) external;
}

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

import './IProtocolFees.sol';

interface IProtocolFeeRouter {
  function protocolFees() external view returns (IProtocolFees);
}

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

interface IProtocolFees {
  event SetYieldAdmin(uint256 newFee);
  event SetYieldBurn(uint256 newFee);

  function DEN() external view returns (uint256);

  function yieldAdmin() external view returns (uint256);

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

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

interface IRewardsWhitelister {
  function whitelist(address token) external view returns (bool);

  function getFullWhitelist() external view returns (address[] memory);
}

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

interface ITokenRewards {
  event AddShares(address indexed wallet, uint256 amount);

  event RemoveShares(address indexed wallet, uint256 amount);

  event ClaimReward(address indexed wallet);

  event DistributeReward(
    address indexed wallet,
    address indexed token,
    uint256 amount
  );

  event DepositRewards(
    address indexed wallet,
    address indexed token,
    uint256 amount
  );

  function totalShares() external view returns (uint256);

  function totalStakers() external view returns (uint256);

  function rewardsToken() external view returns (address);

  function trackingToken() external view returns (address);

  function depositFromPairedLpToken(
    uint256 amount,
    uint256 slippageOverride
  ) external;

  function depositRewards(address token, uint256 amount) external;

  function depositRewardsNoTransfer(address token, uint256 amount) external;

  function claimReward(address wallet) external;

  function setShares(
    address wallet,
    uint256 amount,
    bool sharesRemoving
  ) external;
}

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

interface IV3TwapUtilities {
  function getV3Pool(
    address v3Factory,
    address token0,
    address token1
  ) external view returns (address);

  function getV3Pool(
    address v3Factory,
    address token0,
    address token1,
    uint24 poolFee
  ) external view returns (address);

  function getV3Pool(
    address v3Factory,
    address token0,
    address token1,
    int24 tickSpacing
  ) external view returns (address);

  function getPoolPriceUSDX96(
    address pricePool,
    address nativeStablePool,
    address WETH9
  ) external view returns (uint256);

  function sqrtPriceX96FromPoolAndInterval(
    address pool
  ) external view returns (uint160);

  function priceX96FromSqrtPriceX96(
    uint160 sqrtPriceX96
  ) external pure returns (uint256);
}

// 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 v4.9.0) (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. Compatible with tokens that require the approval to be set to
     * 0 before setting it to a non-zero value.
     */
    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
pragma solidity ^0.8.19;

import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
import '@openzeppelin/contracts/utils/Context.sol';
import '@uniswap/v3-core/contracts/libraries/FixedPoint96.sol';
import './interfaces/IDecentralizedIndex.sol';
import './interfaces/IDexAdapter.sol';
import './interfaces/IPEAS.sol';
import './interfaces/IRewardsWhitelister.sol';
import './interfaces/IProtocolFees.sol';
import './interfaces/IProtocolFeeRouter.sol';
import './interfaces/ITokenRewards.sol';
import './interfaces/IV3TwapUtilities.sol';

contract TokenRewards is ITokenRewards, Context {
  using SafeERC20 for IERC20;

  uint256 constant PRECISION = 10 ** 36;
  uint24 constant REWARDS_POOL_FEE = 10000; // 1%
  int24 constant REWARDS_TICK_SPACING = 200;
  address immutable INDEX_FUND;
  address immutable PAIRED_LP_TOKEN;
  IProtocolFeeRouter immutable PROTOCOL_FEE_ROUTER;
  IRewardsWhitelister immutable REWARDS_WHITELISTER;
  IDexAdapter immutable DEX_ADAPTER;
  IV3TwapUtilities immutable V3_TWAP_UTILS;

  struct Reward {
    uint256 excluded;
    uint256 realized;
  }

  address public immutable override trackingToken;
  address public immutable override rewardsToken; // main rewards token
  uint256 public override totalShares;
  uint256 public override totalStakers;
  mapping(address => uint256) public shares;
  // reward token => user => Reward
  mapping(address => mapping(address => Reward)) public rewards;

  uint256 _rewardsSwapSlippage = 20; // 2%
  // reward token => amount
  mapping(address => uint256) _rewardsPerShare;
  // reward token => amount
  mapping(address => uint256) public rewardsDistributed;
  // reward token => amount
  mapping(address => uint256) public rewardsDeposited;
  // all deposited rewards tokens
  address[] _allRewardsTokens;
  mapping(address => bool) _depositedRewardsToken;

  constructor(
    IProtocolFeeRouter _feeRouter,
    IRewardsWhitelister _rewardsWhitelist,
    IDexAdapter _dexHandler,
    IV3TwapUtilities _v3TwapUtilities,
    address _indexFund,
    address _pairedLpToken,
    address _trackingToken,
    address _rewardsToken
  ) {
    PROTOCOL_FEE_ROUTER = _feeRouter;
    REWARDS_WHITELISTER = _rewardsWhitelist;
    DEX_ADAPTER = _dexHandler;
    V3_TWAP_UTILS = _v3TwapUtilities;
    INDEX_FUND = _indexFund;
    PAIRED_LP_TOKEN = _pairedLpToken;
    trackingToken = _trackingToken;
    rewardsToken = _rewardsToken;
  }

  function setShares(
    address _wallet,
    uint256 _amount,
    bool _sharesRemoving
  ) external override {
    require(_msgSender() == trackingToken, 'UNAUTHORIZED');
    _setShares(_wallet, _amount, _sharesRemoving);
  }

  function _setShares(
    address _wallet,
    uint256 _amount,
    bool _sharesRemoving
  ) internal {
    _processFeesIfApplicable();
    if (_sharesRemoving) {
      _removeShares(_wallet, _amount);
      emit RemoveShares(_wallet, _amount);
    } else {
      _addShares(_wallet, _amount);
      emit AddShares(_wallet, _amount);
    }
  }

  function _addShares(address _wallet, uint256 _amount) internal {
    if (shares[_wallet] > 0) {
      _distributeReward(_wallet);
    }
    uint256 sharesBefore = shares[_wallet];
    totalShares += _amount;
    shares[_wallet] += _amount;
    if (sharesBefore == 0 && shares[_wallet] > 0) {
      totalStakers++;
    }
    _resetExcluded(_wallet);
  }

  function _removeShares(address _wallet, uint256 _amount) internal {
    require(shares[_wallet] > 0 && _amount <= shares[_wallet], 'RE');
    _distributeReward(_wallet);
    totalShares -= _amount;
    shares[_wallet] -= _amount;
    if (shares[_wallet] == 0) {
      totalStakers--;
    }
    _resetExcluded(_wallet);
  }

  function _processFeesIfApplicable() internal {
    IDecentralizedIndex(INDEX_FUND).processPreSwapFeesAndSwap();
  }

  function depositFromPairedLpToken(
    uint256 _amountTknDepositing,
    uint256 _slippageOverride
  ) public override {
    require(PAIRED_LP_TOKEN != rewardsToken, 'R');
    require(_slippageOverride <= 200, 'MS'); // 20%
    if (_amountTknDepositing > 0) {
      IERC20(PAIRED_LP_TOKEN).safeTransferFrom(
        _msgSender(),
        address(this),
        _amountTknDepositing
      );
    }
    uint256 _amountTkn = IERC20(PAIRED_LP_TOKEN).balanceOf(address(this));
    require(_amountTkn > 0, 'A');
    uint256 _adminAmt = _getAdminFeeFromAmount(_amountTkn);
    _amountTkn -= _adminAmt;
    (address _token0, address _token1) = PAIRED_LP_TOKEN < rewardsToken
      ? (PAIRED_LP_TOKEN, rewardsToken)
      : (rewardsToken, PAIRED_LP_TOKEN);
    address _pool;
    try DEX_ADAPTER.getV3Pool(_token0, _token1, REWARDS_POOL_FEE) returns (
      address __pool
    ) {
      _pool = __pool;
    } catch {
      _pool = DEX_ADAPTER.getV3Pool(_token0, _token1, REWARDS_TICK_SPACING);
    }
    uint160 _rewardsSqrtPriceX96 = V3_TWAP_UTILS
      .sqrtPriceX96FromPoolAndInterval(_pool);
    uint256 _rewardsPriceX96 = V3_TWAP_UTILS.priceX96FromSqrtPriceX96(
      _rewardsSqrtPriceX96
    );
    uint256 _amountOut = _token0 == PAIRED_LP_TOKEN
      ? (_rewardsPriceX96 * _amountTkn) / FixedPoint96.Q96
      : (_amountTkn * FixedPoint96.Q96) / _rewardsPriceX96;

    uint256 _slippage = _slippageOverride > 0
      ? _slippageOverride
      : _rewardsSwapSlippage;
    _swapForRewards(
      _amountTkn,
      _amountOut,
      _slippage,
      _slippageOverride > 0,
      _adminAmt
    );
  }

  function depositRewards(address _token, uint256 _amount) external override {
    _depositRewardsFromToken(_msgSender(), _token, _amount, true);
  }

  function depositRewardsNoTransfer(
    address _token,
    uint256 _amount
  ) external override {
    require(_msgSender() == INDEX_FUND, 'AUTH');
    _depositRewardsFromToken(_msgSender(), _token, _amount, false);
  }

  function _depositRewardsFromToken(
    address _user,
    address _token,
    uint256 _amount,
    bool _shouldTransfer
  ) internal {
    require(_amount > 0, 'A');
    require(_isValidRewardsToken(_token), 'V');
    uint256 _finalAmt = _amount;
    if (_shouldTransfer) {
      uint256 _balBefore = IERC20(_token).balanceOf(address(this));
      IERC20(_token).safeTransferFrom(_user, address(this), _finalAmt);
      _finalAmt = IERC20(_token).balanceOf(address(this)) - _balBefore;
    }
    uint256 _adminAmt = _getAdminFeeFromAmount(_finalAmt);
    if (_adminAmt > 0) {
      IERC20(_token).safeTransfer(
        Ownable(address(V3_TWAP_UTILS)).owner(),
        _adminAmt
      );
      _finalAmt -= _adminAmt;
    }
    _depositRewards(_token, _finalAmt);
  }

  function _depositRewards(address _token, uint256 _amountTotal) internal {
    if (!_depositedRewardsToken[_token]) {
      _depositedRewardsToken[_token] = true;
      _allRewardsTokens.push(_token);
    }
    if (_amountTotal == 0) {
      return;
    }
    if (totalShares == 0) {
      require(_token == rewardsToken, 'R');
      _burnRewards(_amountTotal);
      return;
    }

    uint256 _depositAmount = _amountTotal;
    if (_token == rewardsToken) {
      (, uint256 _yieldBurnFee) = _getYieldFees();
      if (_yieldBurnFee > 0) {
        uint256 _burnAmount = (_amountTotal * _yieldBurnFee) /
          PROTOCOL_FEE_ROUTER.protocolFees().DEN();
        if (_burnAmount > 0) {
          _burnRewards(_burnAmount);
          _depositAmount -= _burnAmount;
        }
      }
    }
    rewardsDeposited[_token] += _depositAmount;
    _rewardsPerShare[_token] += (PRECISION * _depositAmount) / totalShares;
    emit DepositRewards(_msgSender(), _token, _depositAmount);
  }

  function _distributeReward(address _wallet) internal {
    if (shares[_wallet] == 0) {
      return;
    }
    for (uint256 _i; _i < _allRewardsTokens.length; _i++) {
      address _token = _allRewardsTokens[_i];
      uint256 _amount = getUnpaid(_token, _wallet);
      rewards[_token][_wallet].realized += _amount;
      rewards[_token][_wallet].excluded = _cumulativeRewards(
        _token,
        shares[_wallet]
      );
      if (_amount > 0) {
        rewardsDistributed[_token] += _amount;
        IERC20(_token).safeTransfer(_wallet, _amount);
        emit DistributeReward(_wallet, _token, _amount);
      }
    }
  }

  function _resetExcluded(address _wallet) internal {
    for (uint256 _i; _i < _allRewardsTokens.length; _i++) {
      address _token = _allRewardsTokens[_i];
      rewards[_token][_wallet].excluded = _cumulativeRewards(
        _token,
        shares[_wallet]
      );
    }
  }

  function _burnRewards(uint256 _burnAmount) internal {
    try IPEAS(rewardsToken).burn(_burnAmount) {} catch {
      IERC20(rewardsToken).safeTransfer(address(0xdead), _burnAmount);
    }
  }

  function _isValidRewardsToken(address _token) internal view returns (bool) {
    return _token == rewardsToken || REWARDS_WHITELISTER.whitelist(_token);
  }

  function _getAdminFeeFromAmount(
    uint256 _amount
  ) internal view returns (uint256) {
    (uint256 _yieldAdminFee, ) = _getYieldFees();
    if (_yieldAdminFee == 0) {
      return 0;
    }
    return
      (_amount * _yieldAdminFee) / PROTOCOL_FEE_ROUTER.protocolFees().DEN();
  }

  function _getYieldFees()
    internal
    view
    returns (uint256 _admin, uint256 _burn)
  {
    IProtocolFees _fees = PROTOCOL_FEE_ROUTER.protocolFees();
    if (address(_fees) != address(0)) {
      _admin = _fees.yieldAdmin();
      _burn = _fees.yieldBurn();
    }
  }

  function _swapForRewards(
    uint256 _amountIn,
    uint256 _amountOut,
    uint256 _slippage,
    bool _isSlipOverride,
    uint256 _adminAmt
  ) internal {
    uint256 _balBefore = IERC20(rewardsToken).balanceOf(address(this));
    IERC20(PAIRED_LP_TOKEN).safeIncreaseAllowance(
      address(DEX_ADAPTER),
      _amountIn
    );
    try
      DEX_ADAPTER.swapV3Single(
        PAIRED_LP_TOKEN,
        rewardsToken,
        REWARDS_POOL_FEE,
        _amountIn,
        (_amountOut * (1000 - _slippage)) / 1000,
        address(this)
      )
    {
      if (_adminAmt > 0) {
        IERC20(PAIRED_LP_TOKEN).safeTransfer(
          Ownable(address(V3_TWAP_UTILS)).owner(),
          _adminAmt
        );
      }
      _rewardsSwapSlippage = 20;
      _depositRewards(
        rewardsToken,
        IERC20(rewardsToken).balanceOf(address(this)) - _balBefore
      );
    } catch {
      if (!_isSlipOverride && _rewardsSwapSlippage < 200) {
        _rewardsSwapSlippage += 10;
      }
      IERC20(PAIRED_LP_TOKEN).safeDecreaseAllowance(
        address(DEX_ADAPTER),
        _amountIn
      );
    }
  }

  function claimReward(address _wallet) external override {
    _distributeReward(_wallet);
    emit ClaimReward(_wallet);
  }

  function getUnpaid(
    address _token,
    address _wallet
  ) public view returns (uint256) {
    if (shares[_wallet] == 0) {
      return 0;
    }
    uint256 earnedRewards = _cumulativeRewards(_token, shares[_wallet]);
    uint256 rewardsExcluded = rewards[_token][_wallet].excluded;
    if (earnedRewards <= rewardsExcluded) {
      return 0;
    }
    return earnedRewards - rewardsExcluded;
  }

  function _cumulativeRewards(
    address _token,
    uint256 _share
  ) internal view returns (uint256) {
    return (_share * _rewardsPerShare[_token]) / PRECISION;
  }
}

{
  "compilationTarget": {
    "contracts/TokenRewards.sol": "TokenRewards"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "none"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}