// File: src/PirexFees.sol



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

import {Ownable2Step} from "openzeppelin-contracts/contracts/access/Ownable2Step.sol";
import {ERC20} from "solmate/tokens/ERC20.sol";
import {SafeTransferLib} from "solmate/utils/SafeTransferLib.sol";
import {DataTypes} from "./libraries/DataTypes.sol";
import {Errors} from "./libraries/Errors.sol";

/**
 * @title  PirexFees
 * @notice Handling protocol fees distributions
 * @dev    This contract manages the distribution of protocol fees to assigned recipient.
 * @author redactedcartel.finance
 */
contract PirexFees is Ownable2Step {
    /**
     * @dev Library: SafeTransferLib - Provides safe transfer functions for ERC20 tokens.
     */
    using SafeTransferLib for ERC20;

    /**
     * @notice The address designated as the recipient for fees distribution.
     * @dev    This address is configurable and determines where fees is directed.
     */
    address public recipient;

    // Events
    /**
     * @notice Emitted when a fee recipient address is set.
     * @dev    Signals changes to fee recipient addresses.
     * @param  recipient  address  The new address set as the new fee recipient.
     */
    event SetRecipient(address recipient);

    /**
     * @notice Emitted when fees are distributed.
     * @dev    Signals the distribution of fees.
     * @param  token   address  The token address for which fees are distributed.
     * @param  amount  uint256  The amount of fees being distributed.
     */
    event DistributeFees(address token, uint256 amount);

    /**
     * @notice Constructor to initialize the fee recipient addresses.
     * @dev    Initializes the contract with the provided recipient address.
     * @param  _recipient  address  The address of the fee recipient.
     */
    constructor(address _recipient) {
        if (_recipient == address(0)) revert Errors.ZeroAddress();

        recipient = _recipient;
    }

    /**
     * @notice Set a fee recipient address.
     * @dev    Allows the owner to set the fee recipient address.
     * @param  _recipient  address  Fee recipient address.
     */
    function setRecipient(address _recipient) external onlyOwner {
        if (_recipient == address(0)) revert Errors.ZeroAddress();

        emit SetRecipient(_recipient);

        recipient = _recipient;
    }

    /**
     * @notice Distribute fees.
     * @param  from    address  Fee source address.
     * @param  token   address  Fee token address.
     * @param  amount  uint256  Fee token amount.
     */
    function distributeFees(
        address from,
        address token,
        uint256 amount
    ) external {
        emit DistributeFees(token, amount);

        ERC20 t = ERC20(token);

        // Favoring push over pull to reduce accounting complexity for different tokens
        t.safeTransferFrom(from, recipient, amount);
    }
}

// File: lib/openzeppelin-contracts/contracts/access/Ownable2Step.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.0;

import "./Ownable.sol";

/**
 * @dev Contract module which provides 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} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;

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

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

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        address sender = _msgSender();
        require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
        _transferOwnership(sender);
    }
}

// File: lib/solmate/src/tokens/ERC20.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Transfer(address indexed from, address indexed to, uint256 amount);

    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /*//////////////////////////////////////////////////////////////
                            METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string public name;

    string public symbol;

    uint8 public immutable decimals;

    /*//////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;

    mapping(address => mapping(address => uint256)) public allowance;

    /*//////////////////////////////////////////////////////////////
                            EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;

        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }

    /*//////////////////////////////////////////////////////////////
                               ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/

    function approve(address spender, uint256 amount) public virtual returns (bool) {
        allowance[msg.sender][spender] = amount;

        emit Approval(msg.sender, spender, amount);

        return true;
    }

    function transfer(address to, uint256 amount) public virtual returns (bool) {
        balanceOf[msg.sender] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(msg.sender, to, amount);

        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.

        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;

        balanceOf[from] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(from, to, amount);

        return true;
    }

    /*//////////////////////////////////////////////////////////////
                             EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");

        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            address recoveredAddress = ecrecover(
                keccak256(
                    abi.encodePacked(
                        "\x19\x01",
                        DOMAIN_SEPARATOR(),
                        keccak256(
                            abi.encode(
                                keccak256(
                                    "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
                                ),
                                owner,
                                spender,
                                value,
                                nonces[owner]++,
                                deadline
                            )
                        )
                    )
                ),
                v,
                r,
                s
            );

            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
    }

    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(address(0), to, amount);
    }

    function _burn(address from, uint256 amount) internal virtual {
        balanceOf[from] -= amount;

        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }

        emit Transfer(from, address(0), amount);
    }
}

// File: lib/solmate/src/utils/SafeTransferLib.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

import {ERC20} from "../tokens/ERC20.sol";

/// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SafeTransferLib.sol)
/// @dev Use with caution! Some functions in this library knowingly create dirty bits at the destination of the free memory pointer.
/// @dev Note that none of the functions in this library check that a token has code at all! That responsibility is delegated to the caller.
library SafeTransferLib {
    /*//////////////////////////////////////////////////////////////
                             ETH OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferETH(address to, uint256 amount) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Transfer the ETH and store if it succeeded or not.
            success := call(gas(), to, amount, 0, 0, 0, 0)
        }

        require(success, "ETH_TRANSFER_FAILED");
    }

    /*//////////////////////////////////////////////////////////////
                            ERC20 OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferFrom(
        ERC20 token,
        address from,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x23b872dd00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), from) // Append the "from" argument.
            mstore(add(freeMemoryPointer, 36), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 68), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 100 because the length of our calldata totals up like so: 4 + 32 * 3.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 100, 0, 32)
            )
        }

        require(success, "TRANSFER_FROM_FAILED");
    }

    function safeTransfer(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0xa9059cbb00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "TRANSFER_FAILED");
    }

    function safeApprove(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x095ea7b300000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "APPROVE_FAILED");
    }
}

// File: src/libraries/DataTypes.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

/**
 * @title DataTypes
 * @notice Library containing various data structures and enums for the PirexEth.
 * @dev This library provides data structures and enums crucial for the functionality of the Pirex protocol.
 * @author redactedcartel.finance
 */
library DataTypes {
    // Validator struct type
    struct Validator {
        // Publickey of the validator
        bytes pubKey;
        // Signature associated with the validator
        bytes signature;
        // Root hash of deposit data for the validator
        bytes32 depositDataRoot;
        // beneficiazry address to receive pxEth against preDeposit
        address receiver;
    }

    // ValidatorDeque struct type
    struct ValidatorDeque {
        // Beginning index of the validator deque
        int128 _begin;
        // End index of the validator deque
        int128 _end;
        // Mapping of validator index to Validator struct
        mapping(int128 => Validator) _validators;
    }

    // Burner Account Type
    struct BurnerAccount {
        // Address of the burner account
        address account;
        // Amount associated with the burner account
        uint256 amount;
    }

    // Configurable fees
    enum Fees {
        // Fee type for deposit
        Deposit,
        // Fee type for redemption
        Redemption,
        // Fee type for instant redemption
        InstantRedemption
    }

    // Configurable contracts
    enum Contract {
        // PxEth contract
        PxEth,
        // UpxEth contract
        UpxEth,
        // AutoPxEth contract
        AutoPxEth,
        // OracleAdapter contract
        OracleAdapter,
        // PirexEth contract
        PirexEth,
        // RewardRecipient contract
        RewardRecipient
    }

    // Validator statuses
    enum ValidatorStatus {
        // The validator is not staking and has no defined status.
        None,
        // The validator is actively participating in the staking process.
        // It could be in one of the following states: pending_initialized, pending_queued, or active_ongoing.
        Staking,
        // The validator has proceed with the withdrawal process.
        // It represents a meta state for active_exiting, exited_unslashed, and the withdrawal process being possible.
        Withdrawable,
        // The validator's status indicating that ETH is released to the pirexEthValidators
        // It represents the withdrawal_done status.
        Dissolved,
        // The validator's status indicating that it has been slashed due to misbehavior.
        // It serves as a meta state encompassing active_slashed, exited_slashed,
        // and the possibility of starting the withdrawal process (withdrawal_possible) or already completed (withdrawal_done)
        // with the release of ETH, subject to a penalty for the misbehavior.
        Slashed
    }
}

// File: src/libraries/Errors.sol



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

library Errors {
    /**
     * @dev Zero address specified
     */
    error ZeroAddress();

    /**
     * @dev Zero amount specified
     */
    error ZeroAmount();

    /**
     * @dev Invalid fee specified
     */
    error InvalidFee();

    /**
     * @dev Invalid max fee specified
     */
    error InvalidMaxFee();

    /**
     * @dev Zero multiplier used
     */
    error ZeroMultiplier();

    /**
     * @dev ETH deposit is paused
     */
    error DepositingEtherPaused();

    /**
     * @dev ETH deposit is not paused
     */
    error DepositingEtherNotPaused();

    /**
     * @dev Contract is paused
     */
    error Paused();

    /**
     * @dev Contract is not paused
     */
    error NotPaused();

    /**
     * @dev Validator not yet dissolved
     */
    error NotDissolved();

    /**
     * @dev Validator not yet withdrawable
     */
    error NotWithdrawable();

    /**
     * @dev Validator has been previously used before
     */
    error NoUsedValidator();

    /**
     * @dev Not oracle adapter
     */
    error NotOracleAdapter();

    /**
     * @dev Not reward recipient
     */
    error NotRewardRecipient();

    /**
     * @dev Exceeding max value
     */
    error ExceedsMax();

    /**
     * @dev No rewards available
     */
    error NoRewards();

    /**
     * @dev Not PirexEth
     */
    error NotPirexEth();

    /**
     * @dev Not minter
     */
    error NotMinter();

    /**
     * @dev Not burner
     */
    error NotBurner();

    /**
     * @dev Empty string
     */
    error EmptyString();

    /**
     * @dev Validator is Not Staking
     */
    error ValidatorNotStaking();

    /**
     * @dev not enough buffer
     */
    error NotEnoughBuffer();

    /**
     * @dev validator queue empty
     */
    error ValidatorQueueEmpty();

    /**
     * @dev out of bounds
     */
    error OutOfBounds();

    /**
     * @dev cannot trigger validator exit
     */
    error NoValidatorExit();

    /**
     * @dev cannot initiate redemption partially
     */
    error NoPartialInitiateRedemption();

    /**
     * @dev not enough validators
     */
    error NotEnoughValidators();

    /**
     * @dev not enough ETH
     */
    error NotEnoughETH();

    /**
     * @dev max processed count is invalid (< 1)
     */
    error InvalidMaxProcessedCount();

    /**
     * @dev fromIndex and toIndex are invalid
     */
    error InvalidIndexRanges();

    /**
     * @dev ETH is not allowed
     */
    error NoETHAllowed();

    /**
     * @dev ETH is not passed
     */
    error NoETH();

    /**
     * @dev validator status is neither dissolved nor slashed
     */
    error StatusNotDissolvedOrSlashed();

    /**
     * @dev validator status is neither withdrawable nor staking
     */
    error StatusNotWithdrawableOrStaking();

    /**
     * @dev account is not approved
     */
    error AccountNotApproved();

    /**
     * @dev invalid token specified
     */
    error InvalidToken();

    /**
     * @dev not same as deposit size
     */
    error InvalidAmount();

    /**
     * @dev contract not recognised
     */
    error UnrecorgnisedContract();

    /**
     * @dev empty array
     */
    error EmptyArray();

    /**
     * @dev arrays length mismatch
     */
    error MismatchedArrayLengths();
}

// File: lib/openzeppelin-contracts/contracts/access/Ownable.sol



// 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);
    }
}

// File: lib/openzeppelin-contracts/contracts/utils/Context.sol



// 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;
    }
}