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// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.28;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { IERC4626 } from "@openzeppelin/contracts/interfaces/IERC4626.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import { IBaseStrategy } from "../../interfaces/optimizer/IBaseStrategy.sol";
import { IAvKatStrategy } from "../../interfaces/optimizer/strategies/IAvKatStrategy.sol";
import { IRagaEpochVault } from "../../interfaces/IRagaEpochVault.sol";

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

import { Constants } from "../../optimizer/utils/Constants.sol";
import { NotImplemented, ZeroAddress } from "../../utils/Helpers.sol";
import { RagaEpochVaultStorageLibrary } from "../../libraries/RagaEpochVaultStorageLibrary.sol";

contract AvKatStrategy is BaseStrategy, IAvKatStrategy {
    bytes32 private constant STRATEGY_STORAGE_SLOT = keccak256("AvKatStrategy.strategy.storage");
    bytes32 private constant STRATEGY_CONFIG_SLOT = keccak256("AvKatStrategy.config.storage");

    constructor(address optimizerVault, address avKatVault, address katToken) BaseStrategy(optimizerVault) {
        if (avKatVault == address(0)) revert ZeroAddress();
        _getConfig().avKatVault = avKatVault;
        _getConfig().katToken = katToken;
    }

    function processHook(
        address strategy,
        uint32 transactionType,
        bytes calldata cmd
    )
        external
        override
        onlyDelegateCall(strategy)
        onlyEpochProcessingDelegate
    {
        IAvKatStrategy conn = IAvKatStrategy(strategy);
        IBaseStrategy baseStrategy = IBaseStrategy(strategy);
        BaseStrategyStorage memory cfg = baseStrategy.getBaseStrategyConfig();
        AvKatStrategyConfig memory avKatConfig = conn.getConfig();
        IERC4626 avKatVault = IERC4626(avKatConfig.avKatVault);
        IERC20 katToken = IERC20(avKatConfig.katToken);

        if (transactionType == Constants.AVKAT_TRANSACTION_CODE_DEPOSIT) {
            uint256 assets = _decodeCmdForDeposit(cmd);
            _deposit(avKatVault, katToken, cfg.optimizerVault, assets);
        } else if (transactionType == Constants.AVKAT_TRANSACTION_CODE_RESERVE_FOR_WITHDRAWAL) {
            (uint256 avKATReservedForWithdrawal) = _decodeAvKATReservedForWithdrawal(cmd);
            _reserveForWithdrawalEntryPoint(conn, avKATReservedForWithdrawal);
        } else {
            revert InvalidTransactionType(transactionType);
        }
    }

    function finalizeHook(
        address strategy,
        uint32 transactionType,
        bytes calldata /*cmd*/
    )
        external
        override
        onlyDelegateCall(strategy)
        onlyEpochProcessingDelegate
    {
        IAvKatStrategy conn = IAvKatStrategy(strategy);
        if (transactionType != Constants.AVKAT_TRANSACTION_CODE_FINALIZE) {
            revert InvalidTransactionType(transactionType);
        }

        _finalizeForWithdrawalEntryPoint(conn);
    }

    function claimWithdrawalHook(
        uint256 totalSharesForWithdrawal,
        uint256 totalAssetsForWithdrawalInWithdrawalToken
    )
        external
        override
        onlyOptimizerVault
    {
        AvKatStrategyStorage storage s = _getStorage();

        s.totalSharesToBeClaimed -= totalSharesForWithdrawal;
        s.avKATFinalizedForWithdrawal -= totalAssetsForWithdrawalInWithdrawalToken;
    }

    function reserveForWithdrawal(uint256 avKATReservedForWithdrawal) external onlyOptimizerVault onlyEpochProcessing {
        _reserveAvKATForWithdrawal(avKATReservedForWithdrawal);
    }

    function finalizeForWithdrawal(uint256 totalSharesToBeClaimed)
        external
        onlyOptimizerVault
        onlyEpochProcessing
        returns (uint256)
    {
        return _finalizeAvKATForWithdrawal(totalSharesToBeClaimed);
    }

    function _deposit(IERC4626 avKatVault, IERC20 katToken, address optimizerVault, uint256 assets) internal {
        SafeERC20.forceApprove(katToken, address(avKatVault), assets);
        uint256 shares = avKatVault.deposit(assets, optimizerVault);
        emit KATDeposited(assets, shares);
    }

    function _reserveForWithdrawalEntryPoint(IAvKatStrategy conn, uint256 avKATReservedForWithdrawal) internal {
        conn.reserveForWithdrawal(avKATReservedForWithdrawal);
        emit AvKATReservedForWithdrawal(avKATReservedForWithdrawal);
    }

    function _finalizeForWithdrawalEntryPoint(IAvKatStrategy conn) internal {
        RagaEpochVaultStorageLibrary.RagaEpochVaultStorage storage ds = RagaEpochVaultStorageLibrary._getStorage();
        IRagaEpochVault.EpochData storage epochData = RagaEpochVaultStorageLibrary._getProcessingEpochData(ds);
        uint256 sharesBurned = epochData.sharesBurned;

        uint256 avKATFinalized = conn.finalizeForWithdrawal(sharesBurned);
        RagaEpochVaultStorageLibrary._updateEpochWithdrawalInfo(ds, epochData.epoch, avKATFinalized);

        emit AvKATFinalizedForWithdrawal(avKATFinalized, sharesBurned);
    }

    function _reserveAvKATForWithdrawal(uint256 avKATReservedForWithdrawal) internal {
        AvKatStrategyStorage storage s = _getStorage();
        s.avKATReservedForWithdrawal += avKATReservedForWithdrawal;
    }

    function _finalizeAvKATForWithdrawal(uint256 totalSharesToBeClaimed) internal returns (uint256 avKATReserved) {
        AvKatStrategyStorage storage s = _getStorage();

        avKATReserved = s.avKATReservedForWithdrawal;
        (uint256 avKatPresent, bool isNegative) = balance();

        if (isNegative || avKatPresent < avKATReserved) revert InSufficientAvKAT();

        s.avKATFinalizedForWithdrawal += s.avKATReservedForWithdrawal;
        s.totalSharesToBeClaimed += totalSharesToBeClaimed;
        s.avKATReservedForWithdrawal = 0;
    }

    function balance() public view override returns (uint256 delta, bool isNegative) {
        BaseStrategyStorage storage s = _getBaseStrategyStorage();
        AvKatStrategyConfig storage c = _getConfig();

        IERC4626 avKatVault = IERC4626(c.avKatVault);

        uint256 avKATBalance = avKatVault.balanceOf(s.optimizerVault);
        uint256 avKATFinalized = _getStorage().avKATFinalizedForWithdrawal;

        if (avKATBalance < avKATFinalized) {
            delta = avKATFinalized - avKATBalance;
            isNegative = true;
        } else {
            delta = avKATBalance - avKATFinalized;
            isNegative = false;
        }

        delta = avKatVault.convertToAssets(delta);
    }

    function token() external view override returns (address) {
        return _getConfig().avKatVault;
    }

    function isDepositEnabled() external pure override returns (bool) {
        return true;
    }

    function getConfig() external pure returns (AvKatStrategyConfig memory) {
        return _getConfig();
    }

    function avKATFinalizedForWithdrawal() external view returns (uint256) {
        return _getStorage().avKATFinalizedForWithdrawal;
    }

    function encodeCmdForDeposit(uint256 assets) external pure returns (bytes memory) {
        return abi.encode(assets);
    }

    function encodeCmdForReserveForWithdrawal(uint256 avKATReservedForWithdrawal) external pure returns (bytes memory) {
        return abi.encode(avKATReservedForWithdrawal);
    }

    function encodeCmdForFinalizeForWithdrawal(uint256 totalSharesToBeClaimed) external pure returns (bytes memory) {
        return abi.encode(totalSharesToBeClaimed);
    }

    function _decodeCmdForDeposit(bytes calldata cmd) internal pure returns (uint256) {
        return abi.decode(cmd, (uint256));
    }

    function _decodeAvKATReservedForWithdrawal(bytes calldata cmd) internal pure returns (uint256) {
        return abi.decode(cmd, (uint256));
    }

    function _getConfig() internal pure returns (AvKatStrategyConfig storage s) {
        bytes32 slot = STRATEGY_CONFIG_SLOT;
        assembly {
            s.slot := slot
        }
    }

    function _getStorage() internal pure returns (AvKatStrategyStorage storage s) {
        bytes32 slot = STRATEGY_STORAGE_SLOT;
        assembly {
            s.slot := slot
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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 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);

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC4626.sol)

pragma solidity >=0.6.2;

import {IERC20} from "../token/ERC20/IERC20.sol";
import {IERC20Metadata} from "../token/ERC20/extensions/IERC20Metadata.sol";

/**
 * @dev Interface of the ERC-4626 "Tokenized Vault Standard", as defined in
 * https://eips.ethereum.org/EIPS/eip-4626[ERC-4626].
 */
interface IERC4626 is IERC20, IERC20Metadata {
    event Deposit(address indexed sender, address indexed owner, uint256 assets, uint256 shares);

    event Withdraw(
        address indexed sender,
        address indexed receiver,
        address indexed owner,
        uint256 assets,
        uint256 shares
    );

    /**
     * @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 total amount of the underlying asset that is “managed” by Vault.
     *
     * - SHOULD include any compounding that occurs from yield.
     * - MUST be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT revert.
     */
    function totalAssets() external view returns (uint256 totalManagedAssets);

    /**
     * @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 Returns the maximum amount of the underlying asset that can be deposited into the Vault for the receiver,
     * through a deposit call.
     *
     * - MUST return a limited value if receiver is subject to some deposit limit.
     * - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of assets that may be deposited.
     * - MUST NOT revert.
     */
    function maxDeposit(address receiver) external view returns (uint256 maxAssets);

    /**
     * @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 Mints shares Vault shares to receiver by depositing exactly amount of underlying tokens.
     *
     * - MUST emit the Deposit event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   deposit execution, and are accounted for during deposit.
     * - MUST revert if all of assets cannot be deposited (due to deposit limit being reached, slippage, the user not
     *   approving enough underlying tokens to the Vault contract, etc).
     *
     * NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token.
     */
    function deposit(uint256 assets, address receiver) external returns (uint256 shares);

    /**
     * @dev Returns the maximum amount of the Vault shares that can be minted for the receiver, through a mint call.
     * - MUST return a limited value if receiver is subject to some mint limit.
     * - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of shares that may be minted.
     * - MUST NOT revert.
     */
    function maxMint(address receiver) external view returns (uint256 maxShares);

    /**
     * @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 Mints exactly shares Vault shares to receiver by depositing amount of underlying tokens.
     *
     * - MUST emit the Deposit event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the mint
     *   execution, and are accounted for during mint.
     * - MUST revert if all of shares cannot be minted (due to deposit limit being reached, slippage, the user not
     *   approving enough underlying tokens to the Vault contract, etc).
     *
     * NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token.
     */
    function mint(uint256 shares, address receiver) external returns (uint256 assets);

    /**
     * @dev Returns the maximum amount of the underlying asset that can be withdrawn from the owner balance in the
     * Vault, through a withdraw call.
     *
     * - MUST return a limited value if owner is subject to some withdrawal limit or timelock.
     * - MUST NOT revert.
     */
    function maxWithdraw(address owner) external view returns (uint256 maxAssets);

    /**
     * @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 Burns shares from owner and sends exactly assets of underlying tokens to receiver.
     *
     * - MUST emit the Withdraw event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   withdraw execution, and are accounted for during withdraw.
     * - MUST revert if all of assets cannot be withdrawn (due to withdrawal limit being reached, slippage, the owner
     *   not having enough shares, etc).
     *
     * Note that some implementations will require pre-requesting to the Vault before a withdrawal may be performed.
     * Those methods should be performed separately.
     */
    function withdraw(uint256 assets, address receiver, address owner) external returns (uint256 shares);

    /**
     * @dev Returns the maximum amount of Vault shares that can be redeemed from the owner balance in the Vault,
     * through a redeem call.
     *
     * - MUST return a limited value if owner is subject to some withdrawal limit or timelock.
     * - MUST return balanceOf(owner) if owner is not subject to any withdrawal limit or timelock.
     * - MUST NOT revert.
     */
    function maxRedeem(address owner) external view returns (uint256 maxShares);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their redemption 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);

    /**
     * @dev Burns exactly shares from owner and sends assets of underlying tokens to receiver.
     *
     * - MUST emit the Withdraw event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   redeem execution, and are accounted for during redeem.
     * - MUST revert if all of shares cannot be redeemed (due to withdrawal limit being reached, slippage, the owner
     *   not having enough shares, etc).
     *
     * NOTE: some implementations will require pre-requesting to the Vault before a withdrawal may be performed.
     * Those methods should be performed separately.
     */
    function redeem(uint256 shares, address receiver, address owner) external returns (uint256 assets);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 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 {
    /**
     * @dev An operation with an ERC-20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @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.encodeCall(token.transfer, (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.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transferFrom, (from, to, 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.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @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.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

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

    /**
     * @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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 {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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 silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.28;

interface IBaseStrategy {
    struct BaseStrategyStorage {
        address optimizerVault;
    }

    // To be called via delegate
    function processHook(address strategy, uint32 transactionType, bytes calldata cmd) external;

    // To be called via delegate
    function finalizeHook(address strategy, uint32 transactionType, bytes calldata cmd) external;

    // To be called directly. How much asset to be deducted from reserve when claiming withdrawal
    function claimWithdrawalHook(
        uint256 totalSharesForWithdrawal,
        uint256 totalAssetsForWithdrawalInWithdrawalToken
    )
        external;

    function getBaseStrategyConfig() external view returns (BaseStrategyStorage memory);

    // Returns balance for vault accounted by the strategy in terms of underlying token
    function balance() external view returns (uint256, bool);

    // Token whitelisted to be deposited in the strategy
    function token() external view returns (address);

    // Whether user can directly deposits token linked to this strategy
    function isDepositEnabled() external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.28;

interface IAvKatStrategy {
    struct AvKatStrategyStorage {
        uint256 avKATFinalizedForWithdrawal;
        uint256 avKATReservedForWithdrawal;
        uint256 totalSharesToBeClaimed;
    }

    struct AvKatStrategyConfig {
        address katToken;
        address avKatVault;
    }

    error InSufficientAvKAT();

    event KATDeposited(uint256 assets, uint256 shares);
    event AvKATReservedForWithdrawal(uint256 avKATReservedForWithdrawal);
    event AvKATFinalizedForWithdrawal(uint256 avKATFinalizedForWithdrawal, uint256 totalSharesToBeClaimed);

    function reserveForWithdrawal(uint256 avKATReservedForWithdrawal) external;
    function finalizeForWithdrawal(uint256 totalSharesToBeClaimed) external returns (uint256);

    function avKATFinalizedForWithdrawal() external view returns (uint256);
    function getConfig() external view returns (AvKatStrategyConfig memory);
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.28;

interface IRagaEpochVault {
    // Enums
    enum EpochStatus {
        ACTIVE,
        PROCESSING,
        FINALIZED
    }

    // Structs
    struct EpochData {
        uint32 epoch;
        uint48 startTime;
        uint48 endTime;
        // Updated whenever a deposit is made
        uint256 assetsDeposited;
        uint256 sharesMinted;
        // Updated whenever epoch is finalized and withdrawals are processed
        // Asset in terms of withdrawal token
        uint256 assetsWithdrawnInWithdrawalToken;
        // Updated on withdrawal request
        uint256 sharesBurned;
        EpochStatus status;
    }

    struct WithdrawalRequest {
        uint256 shares;
        uint32 epoch;
    }

    // Errors
    error NoEpochProcessing();
    error EpochNotFinalized();
    error EpochNotProcessing();
    error PreviousEpochNotFinalized();

    // Events
    event WithdrawalRequested(address indexed user, uint256 shares, uint256 epoch);
    event WithdrawalClaimed(
        address indexed user, address withdrawalToken, uint256 shares, uint256 assetsInWithdrawalToken
    );

    event EpochStarted(uint256 indexed epoch, uint256 startTime);
    event EpochProcessing(uint256 indexed epoch, uint256 startTime, uint256 endTime, bytes executionData);

    event EpochFinalized(
        uint256 indexed epoch,
        uint256 sharesMinted,
        uint256 assetDeposited,
        uint256 sharesBurned,
        uint256 assetsWithdrawnInWithdrawalToken
    );

    // read-only functions
    function getExecutor() external view returns (address);
    function getCurrentEpoch() external view returns (uint32);
    function getEpochData(uint32 epoch) external view returns (EpochData memory);
    function getWithdrawalToken() external view returns (address);
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.28;

import { IERC4626 } from "@openzeppelin/contracts/interfaces/IERC4626.sol";

import { IRagaEpochVault } from "../../interfaces/IRagaEpochVault.sol";
import { IBaseStrategy } from "../../interfaces/optimizer/IBaseStrategy.sol";
import { IOptimizerVault } from "../../interfaces/optimizer/IOptimizerVault.sol";

import { RagaEpochVaultStorageLibrary } from "../../libraries/RagaEpochVaultStorageLibrary.sol";
import { PermissionDenied, ZeroAddress } from "../../utils/Helpers.sol";

abstract contract BaseStrategy is IBaseStrategy {
    bytes32 private constant BASE_STRATEGY_STORAGE_SLOT = keccak256("BaseStrategy.storage") & ~bytes32(uint256(0xff));

    error NoPrimaryDepositToken();
    error NotWithdrawableByUser();
    error InvalidTransactionType(uint32 transactionType);

    modifier onlyOptimizerVault() {
        BaseStrategyStorage storage s = _getBaseStrategyStorage();
        if (msg.sender != s.optimizerVault) revert PermissionDenied();
        _;
    }

    modifier onlyExecutor() {
        BaseStrategyStorage storage s = _getBaseStrategyStorage();
        if (msg.sender != IRagaEpochVault(s.optimizerVault).getExecutor()) revert PermissionDenied();
        _;
    }

    modifier onlyDelegateCall(address strategy) {
        BaseStrategyStorage memory s = IBaseStrategy(strategy).getBaseStrategyConfig();
        if (address(this) != s.optimizerVault) revert PermissionDenied();
        _;
    }

    modifier onlyEpochProcessingDelegate() {
        require(_isEpochProccessingDelegate(), IRagaEpochVault.NoEpochProcessing());
        _;
    }

    modifier onlyEpochProcessing() {
        BaseStrategyStorage storage s = _getBaseStrategyStorage();
        IRagaEpochVault epochVault = IRagaEpochVault(s.optimizerVault);
        require(_isEpochProcessing(epochVault), IRagaEpochVault.NoEpochProcessing());
        _;
    }

    constructor(address optimizerVault) {
        if (optimizerVault == address(0)) revert ZeroAddress();
        BaseStrategyStorage storage s = _getBaseStrategyStorage();
        s.optimizerVault = optimizerVault;
    }

    function getBaseStrategyConfig() external pure override returns (BaseStrategyStorage memory) {
        return _getBaseStrategyStorage();
    }

    function _isEpochProcessing(IRagaEpochVault epochVault) internal view returns (bool) {
        uint32 currentEpoch = epochVault.getCurrentEpoch();
        if (currentEpoch == 0) return false;
        IRagaEpochVault.EpochData memory epochData = epochVault.getEpochData(currentEpoch - 1);
        return epochData.status == IRagaEpochVault.EpochStatus.PROCESSING;
    }

    function _isEpochProccessingDelegate() internal view returns (bool) {
        RagaEpochVaultStorageLibrary.RagaEpochVaultStorage storage s = RagaEpochVaultStorageLibrary._getStorage();
        uint32 currentEpoch = RagaEpochVaultStorageLibrary._getCurrentEpoch(s);
        if (currentEpoch == 0) return false;
        IRagaEpochVault.EpochData storage epochData = RagaEpochVaultStorageLibrary._getEpochData(s, currentEpoch - 1);
        return epochData.status == IRagaEpochVault.EpochStatus.PROCESSING;
    }

    function _getBaseStrategyStorage() internal pure returns (BaseStrategyStorage storage s) {
        bytes32 slot = BASE_STRATEGY_STORAGE_SLOT;
        assembly {
            s.slot := slot
        }
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.28;

library Constants {
    uint256 constant WAD = 1e18;

    uint32 constant FEE_TYPE_DEPOSIT = 1;
    uint32 constant FEE_TYPE_WITHDRAWAL = 2;
    uint32 constant FEE_TYPE_MANAGEMENT = 3;
    uint32 constant FEE_TYPE_PERFORMANCE = 4;

    uint32 constant MORPHO_SUPPLY_TRANSACTION_CODE_SUPPLY = 1001;
    uint32 constant MORPHO_SUPPLY_TRANSACTION_CODE_WITHDRAW = 1002;
    uint32 constant MORPHO_SUPPLY_TRANSACTION_CODE_MAX_WITHDRAWABLE = 1003;
    uint32 constant MORPHO_SUPPLY_TRANSACTION_CODE_WITHDRAW_ALL = 1004;
    uint32 constant MORPHO_SUPPLY_TRANSACTION_CODE_RESET = 1005;
    uint32 constant MORPHO_SUPPLY_TRANASCTION_CODE_RESERVE_FOR_WITHDRAWAL = 1006;
    uint32 constant MORPHO_SUPPLY_TRANSACTION_CODE_FINALIZE = 1007;

    uint32 constant AVKAT_TRANSACTION_CODE_DEPOSIT = 2001;
    uint32 constant AVKAT_TRANSACTION_CODE_RESERVE_FOR_WITHDRAWAL = 2002;
    uint32 constant AVKAT_TRANSACTION_CODE_FINALIZE = 2003;

    uint32 constant KAT_TRANSACTION_CODE_RESERVE_FOR_WITHDRAWAL = 3001;
    uint32 constant KAT_TRANSACTION_CODE_RESET = 3002;
    uint32 constant KAT_TRANSACTION_CODE_FINALIZE = 3003;

    uint32 constant MORPHO_LOOPING_TRANSACTION_CODE_OPEN_POSITION = 4001;
    uint32 constant MORPHO_LOOPING_TRANSACTION_CODE_DEPOSIT_POSITION = 4002;
    uint32 constant MORPHO_LOOPING_TRANSACTION_CODE_WITHDRAW_POSITION = 4003;
    uint32 constant MORPHO_LOOPING_TRANSACTION_CODE_WITHDRAW_ALL_POSITION = 4004;
    uint32 constant MORPHO_LOOPING_TRANSACTION_CODE_RESERVE_FOR_WITHDRAWAL = 4005;
    uint32 constant MORPHO_LOOPING_TRANSACTION_CODE_RESET = 4006;
    uint32 constant MORPHO_LOOPING_TRANSACTION_CODE_FINALIZE = 4007;
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.28;

// common errors
error IncorrectTypeID(uint256 _typeId, address _sender);
error NegativePriceError();
error PriceStaleError();
error CallFailed();
error NotDepositContract(address _address);
error NotExecutor(address _address);
error NotStrategyContract(address _address);
error IncorrectTokenAddress(address _tokenAddress);
error IncorrectValue();
error IncorrectMessageAddress(address _sender);
error ZeroAddress();
error ZeroAmount();
error ZeroValue();
error MinimumDustAmountError();
error NonPayableFunction();
error DivideByZeroError();
error PermissionDenied();
error InvalidLendingThreshold();

error NotImplemented();

// common events

//deposit events

//deposit

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.28;

import { IRagaEpochVault } from "../interfaces/IRagaEpochVault.sol";
import { WithrawalQueueLibrary } from "./WithrawalQueueLibrary.sol";

library RagaEpochVaultStorageLibrary {
    using WithrawalQueueLibrary for WithrawalQueueLibrary.WithdrawalQueue;

    bytes32 internal constant STORAGE_SLOT = keccak256("raga.epoch.vault.storage") & ~bytes32(uint256(0xff));

    struct RagaEpochVaultStorage {
        address executor;
        uint32 currentEpoch;
        // Token in which user will receive the withdrawal funds
        address withdrawalToken;
        mapping(uint32 => IRagaEpochVault.EpochData) epochs;
        mapping(address => WithrawalQueueLibrary.WithdrawalQueue) userWithdrawalQueue;
        // Shares scheduled for withdrawal, yet to be processed and claimed by the user
        uint256 scheduledWithdrawalShares;
        uint256 totalAssetsReservedForWithdrawalInWithdrawalToken;
    }

    function _getStorage() internal pure returns (RagaEpochVaultStorage storage ds) {
        bytes32 slot = STORAGE_SLOT;
        assembly {
            ds.slot := slot
        }
    }

    function _initStorage(RagaEpochVaultStorage storage ds, address withdrawalToken, address executor) internal {
        ds.withdrawalToken = withdrawalToken;
        ds.executor = executor;
    }

    function _updateEpochDepositInfo(RagaEpochVaultStorage storage ds, uint256 shares, uint256 assets) internal {
        uint32 epoch = ds.currentEpoch;
        IRagaEpochVault.EpochData storage epochData = ds.epochs[epoch];

        epochData.sharesMinted += shares;
        epochData.assetsDeposited += assets;
    }

    function _updateEpochWithdrawalInfo(RagaEpochVaultStorage storage ds, uint32 epoch, uint256 assets) internal {
        IRagaEpochVault.EpochData storage epochData = ds.epochs[epoch];
        if (epochData.status != IRagaEpochVault.EpochStatus.PROCESSING) {
            revert IRagaEpochVault.EpochNotProcessing();
        }

        epochData.assetsWithdrawnInWithdrawalToken += assets;
    }

    function _initializeFirstEpoch(RagaEpochVaultStorage storage ds) internal {
        ds.currentEpoch = 0;

        ds.epochs[0] = IRagaEpochVault.EpochData({
            epoch: 0,
            startTime: uint48(block.timestamp),
            endTime: 0,
            status: IRagaEpochVault.EpochStatus.ACTIVE,
            assetsDeposited: 0,
            assetsWithdrawnInWithdrawalToken: 0,
            sharesMinted: 0,
            sharesBurned: 0
        });
    }

    /**
     * @dev Increments the current epoch and creates a new epoch data entry.
     * @param ds The storage pointer to the RagaEpochVaultStorage struct.
     */
    function _incrementEpoch(RagaEpochVaultStorage storage ds)
        internal
        returns (uint32 newEpoch, uint32 processingEpoch)
    {
        if (ds.currentEpoch > 0) {
            uint32 previousEpoch = ds.currentEpoch - 1;
            if (ds.epochs[previousEpoch].status != IRagaEpochVault.EpochStatus.FINALIZED) {
                revert IRagaEpochVault.PreviousEpochNotFinalized();
            }
        }

        uint48 currentTs = uint48(block.timestamp);

        // Close the current epoch
        ds.epochs[ds.currentEpoch].endTime = currentTs;
        ds.epochs[ds.currentEpoch].status = IRagaEpochVault.EpochStatus.PROCESSING;
        processingEpoch = ds.currentEpoch;

        // Start a new epoch with relevant details
        ds.currentEpoch++;
        ds.epochs[ds.currentEpoch] = IRagaEpochVault.EpochData({
            epoch: ds.currentEpoch,
            startTime: currentTs,
            endTime: 0,
            status: IRagaEpochVault.EpochStatus.ACTIVE,
            assetsDeposited: 0,
            assetsWithdrawnInWithdrawalToken: 0,
            sharesMinted: 0,
            sharesBurned: 0
        });

        newEpoch = ds.currentEpoch;
    }

    function _finalizeEpoch(RagaEpochVaultStorage storage ds, uint32 epoch) internal {
        IRagaEpochVault.EpochData storage proccessingEpoch = ds.epochs[epoch];
        if (proccessingEpoch.status != IRagaEpochVault.EpochStatus.PROCESSING) {
            revert IRagaEpochVault.EpochNotProcessing();
        }

        // Update the status and assets for epoch finalized
        proccessingEpoch.status = IRagaEpochVault.EpochStatus.FINALIZED;

        // Remove the shares burned from the scheduled withdrawal shares as they have been processed
        ds.scheduledWithdrawalShares -= proccessingEpoch.sharesBurned;
    }

    function _createWithdrawalRequest(RagaEpochVaultStorage storage ds, address user, uint256 shares) internal {
        WithrawalQueueLibrary.WithdrawalQueue storage queue = ds.userWithdrawalQueue[user];

        ds.scheduledWithdrawalShares += shares;
        ds.epochs[ds.currentEpoch].sharesBurned += shares;

        if (queue._isEmpty()) {
            queue._enqueue(IRagaEpochVault.WithdrawalRequest({ shares: shares, epoch: ds.currentEpoch }));
            return;
        }

        IRagaEpochVault.WithdrawalRequest storage latestRequest = queue._backMut();
        if (latestRequest.epoch == ds.currentEpoch) {
            latestRequest.shares += shares;
            return;
        }

        queue._enqueue(IRagaEpochVault.WithdrawalRequest({ shares: shares, epoch: ds.currentEpoch }));
    }

    /**
     * @notice Clears the withdrawal queue for a user from all claimable requests
     * @dev Effect step which clears all the claimable requests from the withdrawal queue
     * @param ds The storage pointer to the RagaEpochVaultStorage struct.
     * @param user The address of the user whose withdrawal queue is to be cleared.
     */
    function _aggregateAndClearClaimableWithdrawalRequests(
        RagaEpochVaultStorage storage ds,
        address user
    )
        internal
        returns (uint256 totalShares, uint256 totalAssetsInWithdrawalToken)
    {
        WithrawalQueueLibrary.WithdrawalQueue storage queue = ds.userWithdrawalQueue[user];

        while (!queue._isEmpty()) {
            uint128 idx = queue._head();
            IRagaEpochVault.WithdrawalRequest memory request = queue._peek(idx);

            // Check
            if (ds.epochs[request.epoch].status != IRagaEpochVault.EpochStatus.FINALIZED) {
                break;
            }

            // Effect
            totalShares += request.shares;
            totalAssetsInWithdrawalToken += _calculateAssets(ds, request.epoch, request.shares);

            // Interaction
            queue._dequeueFront();
        }
    }

    function _getCurrentEpoch(RagaEpochVaultStorage storage ds) internal view returns (uint32) {
        return ds.currentEpoch;
    }

    function _getEpochData(
        RagaEpochVaultStorage storage ds,
        uint32 epoch
    )
        internal
        view
        returns (IRagaEpochVault.EpochData storage)
    {
        return ds.epochs[epoch];
    }

    function _getProcessingEpochData(RagaEpochVaultStorage storage ds)
        internal
        view
        returns (IRagaEpochVault.EpochData storage)
    {
        uint32 currentEpoch = _getCurrentEpoch(ds);
        if (currentEpoch == 0) revert IRagaEpochVault.NoEpochProcessing();

        IRagaEpochVault.EpochData storage epochData = _getEpochData(ds, currentEpoch - 1);
        if (epochData.status != IRagaEpochVault.EpochStatus.PROCESSING) revert IRagaEpochVault.NoEpochProcessing();

        return epochData;
    }

    function _aggregateClaimableRequests(
        RagaEpochVaultStorage storage ds,
        address user
    )
        internal
        view
        returns (uint256 totalShares, uint256 totalAssetsInWithdrawalToken)
    {
        WithrawalQueueLibrary.WithdrawalQueue storage queue = ds.userWithdrawalQueue[user];

        for (uint128 i = queue._head(); i < queue._tail(); i++) {
            IRagaEpochVault.WithdrawalRequest memory request = queue._peek(i);

            if (ds.epochs[request.epoch].status != IRagaEpochVault.EpochStatus.FINALIZED) {
                break;
            }

            totalShares += request.shares;
            totalAssetsInWithdrawalToken += _calculateAssets(ds, request.epoch, request.shares);
        }
    }

    function _calculateAssets(
        RagaEpochVaultStorage storage ds,
        uint32 epoch,
        uint256 shares
    )
        internal
        view
        returns (uint256)
    {
        IRagaEpochVault.EpochData storage epochData = ds.epochs[epoch];
        if (epochData.status != IRagaEpochVault.EpochStatus.FINALIZED) revert IRagaEpochVault.EpochNotFinalized();

        if (epochData.sharesBurned == 0) return 0;

        return shares * epochData.assetsWithdrawnInWithdrawalToken / epochData.sharesBurned;
    }

    function _getWithdrawalToken(RagaEpochVaultStorage storage ds) internal view returns (address) {
        return ds.withdrawalToken;
    }

    function _getExecutor(RagaEpochVaultStorage storage ds) internal view returns (address) {
        return ds.executor;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity >=0.6.2;

import {IERC20} from "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC-20 standard.
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC1363.sol)

pragma solidity >=0.6.2;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.28;

interface IOptimizerVault {
    // errors
    error NegativeBalance();

    // structs

    // transactionType: Code to be defined in separately
    struct StrategyExecutionCallData {
        address strategy;
        uint32 transactionType;
        bytes cmd;
    }

    // events
    event DepositToken(address user, address token, uint256 assets, uint256 shares);
    event ClaimWithdrawalHookCalled(
        address strategy, uint256 totalSharesForWithdrawal, uint256 totalAssetsForWithdrawalInWithdrawalToken
    );
    event StrategyProcessHookCalled(address strategy, uint32 transactionType);
    event StrategyFinalizeHookCalled(address strategy, uint32 transactionType);

    event FeeTransferred(address sender, address receiver, address token, uint256 fee);
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.28;

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

library WithrawalQueueLibrary {
    struct WithdrawalQueue {
        uint128 head;
        uint128 tail;
        mapping(uint128 => IRagaEpochVault.WithdrawalRequest) requestMap;
    }

    function _head(WithdrawalQueue storage queue) internal view returns (uint128) {
        return queue.head;
    }

    function _tail(WithdrawalQueue storage queue) internal view returns (uint128) {
        return queue.tail;
    }

    function _length(WithdrawalQueue storage queue) internal view returns (uint128) {
        return queue.tail - queue.head;
    }

    function _isEmpty(WithdrawalQueue storage queue) internal view returns (bool) {
        return queue.tail == queue.head;
    }

    function _enqueue(WithdrawalQueue storage queue, IRagaEpochVault.WithdrawalRequest memory request) internal {
        uint128 idx = queue.tail;
        queue.requestMap[idx] = request;
        unchecked {
            queue.tail = idx + 1;
        }
    }

    function _dequeueFront(WithdrawalQueue storage queue) internal returns (IRagaEpochVault.WithdrawalRequest memory) {
        require(queue.tail > queue.head, "Queue: empty");

        uint128 idx = queue.head;
        IRagaEpochVault.WithdrawalRequest memory request = queue.requestMap[idx];

        delete queue.requestMap[idx];
        unchecked {
            queue.head = idx + 1;
        }

        return request;
    }

    function _dequeueBack(WithdrawalQueue storage queue) internal returns (IRagaEpochVault.WithdrawalRequest memory) {
        require(queue.tail > queue.head, "Queue: empty");

        uint128 idx = queue.tail - 1;
        IRagaEpochVault.WithdrawalRequest memory request = queue.requestMap[idx];

        delete queue.requestMap[idx];
        unchecked {
            queue.tail = idx;
        }

        return request;
    }

    /**
     * @notice Returns a mutable reference to the last element in the queue.
     */
    function _backMut(WithdrawalQueue storage queue) internal view returns (IRagaEpochVault.WithdrawalRequest storage) {
        require(queue.tail > queue.head, "Queue: empty");
        uint128 idx = queue.tail - 1;
        return queue.requestMap[idx];
    }

    function _peek(
        WithdrawalQueue storage queue,
        uint128 idx
    )
        internal
        view
        returns (IRagaEpochVault.WithdrawalRequest memory)
    {
        require(idx >= queue.head && idx < queue.tail, "Queue: index out of bounds");
        return queue.requestMap[idx];
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC20.sol)

pragma solidity >=0.4.16;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC165.sol)

pragma solidity >=0.4.16;

import {IERC165} from "../utils/introspection/IERC165.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (utils/introspection/IERC165.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[ERC section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

{
  "remappings": [
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "@openzeppelin/contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "@spectra-core/src/=lib/spectra-core/src/",
    "@pythnetwork/pyth-sdk-solidity/=node_modules/@pythnetwork/pyth-sdk-solidity/",
    "hardhat/=node_modules/hardhat/",
    "@morpho-blue/=lib/morpho-blue/",
    "ds-test/=lib/openzeppelin-foundry-upgrades/lib/solidity-stringutils/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "halmos-cheatcodes/=lib/openzeppelin-contracts-upgradeable/lib/halmos-cheatcodes/src/",
    "morpho-blue/=lib/morpho-blue/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin-erc20-basic/=lib/spectra-core/lib/openzeppelin-contracts/contracts/token/ERC20/",
    "openzeppelin-erc20-extensions/=lib/spectra-core/lib/openzeppelin-contracts-upgradeable/contracts/token/ERC20/extensions/",
    "openzeppelin-erc20/=lib/spectra-core/lib/openzeppelin-contracts-upgradeable/contracts/token/ERC20/",
    "openzeppelin-foundry-upgrades/=lib/openzeppelin-foundry-upgrades/src/",
    "openzeppelin-math/=lib/spectra-core/lib/openzeppelin-contracts/contracts/utils/math/",
    "openzeppelin-proxy/=lib/spectra-core/lib/openzeppelin-contracts-upgradeable/contracts/proxy/utils/",
    "openzeppelin-utils/=lib/spectra-core/lib/openzeppelin-contracts/contracts/utils/",
    "solidity-stringutils/=lib/openzeppelin-foundry-upgrades/lib/solidity-stringutils/",
    "spectra-core/=lib/spectra-core/",
    "v3-core/=lib/v3-core/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 50
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "cancun",
  "viaIR": false
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"optimizerVault","type":"address"},{"internalType":"address","name":"avKatVault","type":"address"},{"internalType":"address","name":"katToken","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"EpochNotProcessing","type":"error"},{"inputs":[],"name":"InSufficientAvKAT","type":"error"},{"inputs":[{"internalType":"uint32","name":"transactionType","type":"uint32"}],"name":"InvalidTransactionType","type":"error"},{"inputs":[],"name":"NoEpochProcessing","type":"error"},{"inputs":[],"name":"NoPrimaryDepositToken","type":"error"},{"inputs":[],"name":"NotWithdrawableByUser","type":"error"},{"inputs":[],"name":"PermissionDenied","type":"error"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"SafeERC20FailedOperation","type":"error"},{"inputs":[],"name":"ZeroAddress","type":"error"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"avKATFinalizedForWithdrawal","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"totalSharesToBeClaimed","type":"uint256"}],"name":"AvKATFinalizedForWithdrawal","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"avKATReservedForWithdrawal","type":"uint256"}],"name":"AvKATReservedForWithdrawal","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"assets","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"shares","type":"uint256"}],"name":"KATDeposited","type":"event"},{"inputs":[],"name":"avKATFinalizedForWithdrawal","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"balance","outputs":[{"internalType":"uint256","name":"delta","type":"uint256"},{"internalType":"bool","name":"isNegative","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"totalSharesForWithdrawal","type":"uint256"},{"internalType":"uint256","name":"totalAssetsForWithdrawalInWithdrawalToken","type":"uint256"}],"name":"claimWithdrawalHook","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"assets","type":"uint256"}],"name":"encodeCmdForDeposit","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"totalSharesToBeClaimed","type":"uint256"}],"name":"encodeCmdForFinalizeForWithdrawal","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"avKATReservedForWithdrawal","type":"uint256"}],"name":"encodeCmdForReserveForWithdrawal","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"totalSharesToBeClaimed","type":"uint256"}],"name":"finalizeForWithdrawal","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"strategy","type":"address"},{"internalType":"uint32","name":"transactionType","type":"uint32"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"finalizeHook","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getBaseStrategyConfig","outputs":[{"components":[{"internalType":"address","name":"optimizerVault","type":"address"}],"internalType":"struct IBaseStrategy.BaseStrategyStorage","name":"","type":"tuple"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"getConfig","outputs":[{"components":[{"internalType":"address","name":"katToken","type":"address"},{"internalType":"address","name":"avKatVault","type":"address"}],"internalType":"struct IAvKatStrategy.AvKatStrategyConfig","name":"","type":"tuple"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"isDepositEnabled","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"strategy","type":"address"},{"internalType":"uint32","name":"transactionType","type":"uint32"},{"internalType":"bytes","name":"cmd","type":"bytes"}],"name":"processHook","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"avKATReservedForWithdrawal","type":"uint256"}],"name":"reserveForWithdrawal","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000c385fee416dcd3731aa3abdccd36dd57dca01223000000000000000000000000297612c171fc8adce32ac333085a9ee1f2bcc1da000000000000000000000000cd6863bb697d7cee5b7ed8dea7d803374f7e4aa6

-----Decoded View---------------
Arg [0] : optimizerVault (address): 0xC385FeE416DCd3731Aa3aBDCCd36dd57dca01223
Arg [1] : avKatVault (address): 0x297612c171fc8ADce32ac333085a9Ee1F2BCC1Da
Arg [2] : katToken (address): 0xCD6863bB697d7CEE5b7Ed8deA7D803374F7e4Aa6

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000c385fee416dcd3731aa3abdccd36dd57dca01223
Arg [1] : 000000000000000000000000297612c171fc8adce32ac333085a9ee1f2bcc1da
Arg [2] : 000000000000000000000000cd6863bb697d7cee5b7ed8dea7d803374f7e4aa6