// File: lib/communal/Address.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.6.11 <0.9.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// File: lib/communal/Context.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.6.11;

/*
 * @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 GSN 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 payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
// File: lib/communal/IERC20.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.6.11;

import "./Context.sol";
import "./SafeMath.sol";

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @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);
}


// File: lib/communal/Owned.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.6.11;

// https://docs.synthetix.io/contracts/Owned
contract Owned {
    address public owner;
    address public nominatedOwner;

    constructor (address _owner) public {
        require(_owner != address(0), "Owner address cannot be 0");
        owner = _owner;
        emit OwnerChanged(address(0), _owner);
    }

    function nominateNewOwner(address _owner) external onlyOwner {
        nominatedOwner = _owner;
        emit OwnerNominated(_owner);
    }

    function acceptOwnership() external {
        require(msg.sender == nominatedOwner, "You must be nominated before you can accept ownership");
        emit OwnerChanged(owner, nominatedOwner);
        owner = nominatedOwner;
        nominatedOwner = address(0);
    }

    modifier onlyOwner {
        require(msg.sender == owner, "Only the contract owner may perform this action");
        _;
    }

    event OwnerNominated(address newOwner);
    event OwnerChanged(address oldOwner, address newOwner);
}
// File: lib/communal/ReentrancyGuard.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.6.11;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}
// File: lib/communal/SafeERC20.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.6.11;

import "./IERC20.sol";
import "./SafeMath.sol";
import "./Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
// File: lib/communal/SafeMath.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.6.11;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     *
     * _Available since v2.4.0._
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}
// File: lib/communal/TransferHelper.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.6.11;

// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: APPROVE_FAILED');
    }

    function safeTransfer(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
    }

    function safeTransferFrom(address token, address from, address to, uint value) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FROM_FAILED');
    }

    function safeTransferETH(address to, uint value) internal {
        (bool success,) = to.call{value:value}(new bytes(0));
        require(success, 'TransferHelper: ETH_TRANSFER_FAILED');
    }
}
// File: src/LSDVault.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.11;

import "communal/ReentrancyGuard.sol";
import "communal/Owned.sol";
import "communal/SafeERC20.sol";
import "communal/TransferHelper.sol";
//import "forge-std/console.sol";

/*
* LSD Vault Contract:
* This contract is responsible for holding and managing the deposited LSDs. It mints unshETH to depositors.
*/

//Access control hierarchy
//owner = multisig: used for initial setup + admin functions + unlocking timelocked functions
//admin = team eoa: used for emergency functions and low level configs
//timelock = multisig can propose unlock + 72 hr delay: used for functions that affect user funds

interface IunshETH {
    function minter_mint(address m_address, uint256 m_amount) external;
    function minter_burn_from(address b_address, uint256 b_amount) external;
    function timelock_address() external returns (address);
    function addMinter(address minter_address) external;
    function setTimelock(address _timelock_address) external;
    function removeMinter(address minter_address) external;
}

interface ILSDVault {
    function balanceInUnderlying() external view returns (uint256);
    function exit(uint256 amount) external;
    function shanghaiTime() external returns(uint256);
}

interface IDarknet {
    function checkPrice(address lsd) external view returns (uint256);
}

contract LSDVault is Owned, ReentrancyGuard {
    using SafeERC20 for IERC20;
    /*
    ============================================================================
    State Variables
    ============================================================================
    */
    // address public admin;
    uint256 public shanghaiTime = 1682007600; //timestamp for April 20, 2023 4:20:00PM UTC (~1 wk after ETH network upgrade)
    address public constant v1VaultAddress = address(0xE76Ffee8722c21b390eebe71b67D95602f58237F);
    address public unshETHAddress;
    address public unshethZapAddress;
    address public swapperAddress;
    address public admin;
    address public darknetAddress;

    address[] public supportedLSDs;
    mapping(address => uint256) public lsdIndex; //keep track of reverse mapping of supportedLSDs indices for fast lookup

    struct LSDConfig {
        uint256 targetWeightBps;
        uint256 weightCapBps;
        uint256 absoluteCapEth;
    }

    mapping(address => LSDConfig) public lsdConfigs;
    bool public useWeightCaps;
    bool public useAbsoluteCaps;
    bool public includeV1VaultAssets;
    mapping(address => bool) public isEnabled;

    uint256 public constant _TIMELOCK = 3 days;
    enum TimelockFunctions { MIGRATE, AMM, DARKNET, ZAP }

    struct TimelockProposal {
        address proposedAddress;
        uint256 unlockTime;
    }

    mapping(TimelockFunctions => TimelockProposal) public timelock;

    //Redeem fees in basis points, configurable by multisig
    uint256 public redeemFee = 0;
    uint256 public constant maxRedeemFee = 200; //max 200 basis points = 2% fee

    bool public depositsPaused;
    bool public migrated = false;
    bool public ammEnabled = false;

    bool public withdrawalsPaused = false;
    uint256 public withdrawalUnpauseTime;

    /*
    ============================================================================
    Events
    ============================================================================
    */
    event DepositPauseToggled(bool paused);
    event ShanghaiTimeUpdated(uint256 newTime);
    event UnshethAddressSet(address unshethAddress);
    event UnshethZapAddressSet(address unshethZapAddress);
    event AdminSet(address admin);

    event LSDAdded(address lsd);
    event LSDConfigSet(address lsd, LSDConfig config);
    event LSDDisabled(address lsd);
    event LSDEnabled(address lsd);

    event AbsoluteCapsToggled(bool useAbsoluteCaps);
    event WeightCapsToggled(bool useWeightCaps);
    event IncludeV1VaultAssetsToggled(bool includeV1Assets);
    event RedeemFeeUpdated(uint256 redeemFee);

    event TimelockUpdateProposed(TimelockFunctions _fn, address _newAddress, uint256 _unlockTime);
    event TimelockUpdateCanceled(TimelockFunctions _fn);
    event TimelockUpdateCompleted(TimelockFunctions _fn);

    event VdAmmDisabled(address swapper);

    event WithdrawalsPaused(uint256 withdrawalUnpauseTime);
    event WithdrawalsUnpaused();

    /*
    ============================================================================
    Constructor
    ============================================================================
    */
    constructor(address _owner, address _darknetAddress, address _unshethAddress, address[] memory _lsds) Owned(_owner){
        darknetAddress = _darknetAddress;
        unshETHAddress = _unshethAddress;
        depositsPaused = true;
        for(uint256 i=0; i < _lsds.length; i = unchkIncr(i)) {
            addLSD(_lsds[i]);
            setLSDConfigs(_lsds[i], 2500, 5000, 2500e18); //initialize with 25% target, 50% max, 2500ETH absolute max
        }
        useWeightCaps = false;
        useAbsoluteCaps = false;
        includeV1VaultAssets = false;
    }
    /*
    ============================================================================
    Function Modifiers
    ============================================================================
    */
    modifier onlyZap {
        require(msg.sender == unshethZapAddress, "Only the unsheth Zap contract may perform this action");
        _;
    }

    modifier onlyOwnerOrAdmin {
        require(msg.sender == owner || msg.sender == admin, "Only the owner or admin may perform this action");
        _;
    }

    modifier postShanghai {
        require(block.timestamp >= shanghaiTime + _TIMELOCK, "ShanghaiTime + Timelock has not passed" );
        _;
    }

    modifier onlyWhenPaused {
        require(depositsPaused, "Deposits must be paused before performing this action" );
        _;
    }

    modifier timelockUnlocked(TimelockFunctions _fn) {
        require(timelock[_fn].unlockTime != 0 && timelock[_fn].unlockTime <= block.timestamp, "Function is timelocked");
        require(timelock[_fn].proposedAddress != address(0), "Cannot set zero address");
        _;
    }

    //helper to perform lower gas unchecked increment in for loops
    function unchkIncr(uint256 i) private pure returns(uint256) {
        unchecked { return i+1; }
    }

    /*
    ============================================================================
    Setup functions
    ============================================================================
    */
    function setUnshethZap(address _unshethZapAddress) external onlyOwner {
        require(unshethZapAddress == address(0), "UnshETH zap address already set" );
        unshethZapAddress = _unshethZapAddress;
        emit UnshethZapAddressSet(unshethZapAddress);
    }

    function setAdmin(address _admin) external onlyOwner {
        admin = _admin;
        emit AdminSet(admin);
    }

    /*
    ============================================================================
    LSD configuration functions
    ============================================================================
    */

    //Workflow to add new LSD: First addLSD, then setLSDConfigs, then configure it in darknet, then enableLSD
    //New LSD is always added with zero weight and disabled
    //Deposits must be paused before configuring, and should be enabled when done

    function addLSD(address _lsd) public onlyOwner onlyWhenPaused {
        require(lsdIndex[_lsd] == 0, "Lsd has already been added"); //fyi fails on the first lsd being duplicated since it has actual index 0
        supportedLSDs.push(_lsd);
        lsdIndex[_lsd] = supportedLSDs.length-1; //reverse mapping of supportedLSDs indices
        isEnabled[_lsd] = false;
        lsdConfigs[_lsd] = LSDConfig(0, 0, 0);
        emit LSDAdded(_lsd);
    }

    function setLSDConfigs(address _lsd, uint256 _targetWeightBps, uint256 _maxWeightBps, uint256 _maxEthCap) public onlyOwner onlyWhenPaused {
        require(_targetWeightBps <= _maxWeightBps, "Cannot set target above max weight");
        require(_targetWeightBps <= 10000 && _maxWeightBps <= 10000, "Cannot set weight above 1");
        lsdConfigs[_lsd] = LSDConfig(_targetWeightBps, _maxWeightBps, _maxEthCap);
        emit LSDConfigSet(_lsd, lsdConfigs[_lsd]);
    }

    function enableLSD(address _lsd) public onlyOwner onlyWhenPaused {
        require(IDarknet(darknetAddress).checkPrice(_lsd) > 0, "Configure lsd in darknet before enabling");
        require(lsdConfigs[_lsd].targetWeightBps > 0 && lsdConfigs[_lsd].weightCapBps > 0 && lsdConfigs[_lsd].absoluteCapEth > 0, "Set weights before enabling");
        isEnabled[_lsd] = true;
        emit LSDEnabled(_lsd);
    }

    function enableAllLSDs() external onlyOwner onlyWhenPaused {
        for(uint256 i=0; i<supportedLSDs.length; i=unchkIncr(i)) {
            enableLSD(supportedLSDs[i]);
        }
    }

    //Disabling resets configs to zero, need to set before re-enabling
    function disableLSD(address _lsd) external onlyOwner onlyWhenPaused {
        lsdConfigs[_lsd] = LSDConfig(0, 0, 0);
        isEnabled[_lsd] = false;
        emit LSDDisabled(_lsd);
    }

    function toggleWeightCaps() external onlyOwner {
        useWeightCaps = !useWeightCaps;
        emit WeightCapsToggled(useWeightCaps);
    }

    function toggleAbsoluteCaps() external onlyOwner {
        useAbsoluteCaps = !useAbsoluteCaps;
        emit AbsoluteCapsToggled(useAbsoluteCaps);
    }

    function toggleV1VaultAssetsForCaps() external onlyOwner {
        includeV1VaultAssets = !includeV1VaultAssets;
        emit IncludeV1VaultAssetsToggled(includeV1VaultAssets);
    }

    function unpauseDeposits() external onlyOwner onlyWhenPaused {
        uint256 totalTargetWeightBps = 0;
        for(uint256 i=0; i < supportedLSDs.length; i = unchkIncr(i)) {
            uint256 targetWeightBps = lsdConfigs[supportedLSDs[i]].targetWeightBps;
            if(targetWeightBps > 0) {
                require(isEnabled[supportedLSDs[i]], "Need to enable LSD with non-zero target weight");
            }
            totalTargetWeightBps += targetWeightBps;
        }
        require(totalTargetWeightBps == 10000, "Total target weight should equal 1");
        depositsPaused = false;
        emit DepositPauseToggled(depositsPaused);
    }

    function isLsdEnabled(address lsd) public view returns(bool) {
        return isEnabled[lsd];
    }

    function getLsdIndex(address lsd) public view returns(uint256) {
        return lsdIndex[lsd];
    }

    //============================================================================
    //Minting unshETH
    //============================================================================

    function deposit(address lsd, uint256 amount) external onlyZap nonReentrant {
        _deposit(lsd, amount, true);
    }

    //Gas efficient function to mint unshETH while skipping cap checks
    function depositNoCapCheck(address lsd, uint256 amount) external onlyZap nonReentrant {
        _deposit(lsd, amount, false);
    }

    //takes a supported LSD and mints unshETH to the user in proportion
    //this is an internal function, only callable by the approved ETH zap contract
    function _deposit(address lsd, uint256 amount, bool checkAgainstCaps) private {
        require(depositsPaused == false, "Deposits are paused");
        require(migrated == false, "Already migrated, deposit to new vault");
        require(isEnabled[lsd], "LSD is disabled");
        if(checkAgainstCaps) {
            uint256 balance = getCombinedVaultBalance(lsd);
            if(useAbsoluteCaps) {
                require(balance + amount <= getAbsoluteCap(lsd), "Deposit exceeds absolute cap");
            }
            if(useWeightCaps) {
                require(balance + amount <= getWeightCap(lsd, amount), "Deposit exceeds weight based cap");
            }
        }
        uint256 price = getPrice(lsd);
        TransferHelper.safeTransferFrom(lsd, msg.sender, address(this), amount);
        IunshETH(unshETHAddress).minter_mint(msg.sender, price*amount/1e18);
    }

    //Gas efficient function to mint unshETH with multiple LSDs in the same txn
    //Checks against caps are skipped as the purpose of this function is for V1 to V2 vault migration
    //Ensure that the indices of amounts correspond to indices of supportedLSDs (can look up using getLsdIndex)
    function depositMultipleNoCapCheck(uint256[4] memory amounts) external onlyZap nonReentrant {
        require(depositsPaused == false, "Deposits are paused");
        require(migrated == false, "Already migrated, deposit to new vault");
        uint256 unshethToMint = 0;
        for(uint256 i=0; i<supportedLSDs.length; i=unchkIncr(i)) {
            address lsd = supportedLSDs[i];
            require(isEnabled[lsd], "LSD is disabled");
            uint256 amount = amounts[i];
            uint256 price = getPrice(lsd);
            uint256 marketRate = getEthConversionRate(lsd);
            //log each transfer
            TransferHelper.safeTransferFrom(lsd, msg.sender, address(this), amount);
            unshethToMint += price*amount/1e18;
        }
        IunshETH(unshETHAddress).minter_mint(msg.sender, unshethToMint);
    }

    function getEthConversionRate(address lsd) public view returns(uint256) {
        return IDarknet(darknetAddress).checkPrice(lsd);
    }

    function getPrice(address lsd) public view returns(uint256) {
        uint256 rate = getEthConversionRate(lsd);
        if(IERC20(unshETHAddress).totalSupply() == 0){
            return rate;
        }
        else {
            return 1e18* rate /stakedETHperunshETH();
        }
    }

    function stakedETHperunshETH() public view returns (uint256) {
        return 1e18*balanceInUnderlying()/IERC20(unshETHAddress).totalSupply();
    }

    function balanceInUnderlying() public view returns (uint256) {
        uint256 underlyingBalance = 0;
        for (uint256 i = 0; i < supportedLSDs.length; i = unchkIncr(i)) {
            uint256 rate = getEthConversionRate(supportedLSDs[i]);
            underlyingBalance += rate *IERC20(supportedLSDs[i]).balanceOf(address(this))/1e18;
        }
        return underlyingBalance;
    }

    function getAbsoluteCap(address lsd) public view returns(uint256) {
        if(!useAbsoluteCaps) {
            return type(uint256).max;
        }
        uint256 absoluteCap = 1e18*lsdConfigs[lsd].absoluteCapEth/getEthConversionRate(lsd);
        return absoluteCap;
    }

    function getWeightCap(address lsd, uint256 marginalDeposit) public view returns(uint256) {
        if(!useWeightCaps) {
            return type(uint256).max;
        }
        uint256 weightCapBps = lsdConfigs[lsd].weightCapBps;
        uint256 rate = getEthConversionRate(lsd);
        uint256 marginalDepositInEth = marginalDeposit*rate/1e18;
        uint256 v1VaultEthBalance = _getV1VaultEthBalance();
        uint256 totalEthBalance = balanceInUnderlying() + v1VaultEthBalance + marginalDepositInEth;
        uint256 weightCapInEth = totalEthBalance*weightCapBps/10000;
        return 1e18*weightCapInEth/rate;
    }

    function getEffectiveCap(address lsd, uint256 marginalDeposit) public view returns(uint256) {
        uint256 absoluteCap = getAbsoluteCap(lsd);
        uint256 weightCap = getWeightCap(lsd, marginalDeposit);
        if(weightCap < absoluteCap) {
            return weightCap;
        } else {
            return absoluteCap;
        }
    }

    function getTargetAmount(address lsd, uint256 marginalDeposit) public view returns(uint256) {
        uint256 targetWeightBps = lsdConfigs[lsd].targetWeightBps;
        uint256 rate = getEthConversionRate(lsd);
        uint256 marginalDepositInEth = marginalDeposit*rate/1e18;
        uint256 v1VaultEthBalance = _getV1VaultEthBalance();
        uint256 totalEthBalance = balanceInUnderlying() + v1VaultEthBalance + marginalDepositInEth;
        uint256 targetInEth = totalEthBalance* targetWeightBps /10000;
        return 1e18*targetInEth/rate;
    }

    function _getV1VaultBalance(address lsd) internal view returns(uint256) {
        uint256 v1VaultBalance = 0;
        if(includeV1VaultAssets) {
            v1VaultBalance = IERC20(lsd).balanceOf(v1VaultAddress);
        }
        return v1VaultBalance;
    }

    function _getV1VaultEthBalance() internal view returns(uint256) {
        uint256 v1VaultEthBalance = 0;
        if(includeV1VaultAssets) {
            v1VaultEthBalance = ILSDVault(v1VaultAddress).balanceInUnderlying();
        }
        return v1VaultEthBalance;
    }

    function getCombinedVaultBalance(address lsd) public view returns(uint256) {
        uint256 balance = IERC20(lsd).balanceOf(address(this));
        return balance + _getV1VaultBalance(lsd);
    }


    //============================================================================
    //Helper functions for UI / Zap / AMM
    //============================================================================
    function remainingRoomToCap(address lsd, uint256 marginalDeposit) public view returns(uint256) {
        uint256 combinedBalance = getCombinedVaultBalance(lsd);
        uint256 effectiveCap = getEffectiveCap(lsd, marginalDeposit);
        if(combinedBalance > effectiveCap) {
            return 0;
        } else {
            return (effectiveCap - combinedBalance);
        }
    }

    function remainingRoomToCapInEthTerms(address lsd, uint256 marginalDepositEth) public view returns(uint256) {
        uint256 rate = getEthConversionRate(lsd);
        uint256 marginalDeposit = 1e18*marginalDepositEth/rate;
        return remainingRoomToCap(lsd,marginalDeposit)*getEthConversionRate(lsd)/1e18;
    }

    function remainingRoomToTarget(address lsd, uint256 marginalDeposit) public view returns(uint256) {
        uint256 combinedBalance = getCombinedVaultBalance(lsd);
        uint256 target = getTargetAmount(lsd, marginalDeposit);
        if(combinedBalance > target) {
            return 0;
        } else {
            return (target - combinedBalance);
        }
    }

    function remainingRoomToTargetInEthTerms(address lsd, uint256 marginalDepositEth) public view returns(uint256) {
        uint256 rate = getEthConversionRate(lsd);
        uint256 marginalDeposit = 1e18*marginalDepositEth/rate;
        return remainingRoomToTarget(lsd,marginalDeposit)*rate/1e18;
    }

    //============================================================================
    //Redeeming unshETH
    //============================================================================
    function setRedeemFee(uint256 _redeemFee) external onlyOwner {
        require(_redeemFee <= maxRedeemFee, "Redeem fee too high");
        redeemFee = _redeemFee;
        emit RedeemFeeUpdated(redeemFee);
    }

    function exit(uint256 amount) external nonReentrant {
        require(migrated == false, "Already migrated, use new vault to exit");
        require(block.timestamp > shanghaiTime, "Cannot exit until shanghaiTime");
        require(!withdrawalsPaused || block.timestamp > withdrawalUnpauseTime, "Withdrawals are paused");
        require(IERC20(unshETHAddress).balanceOf(msg.sender) >= amount,  "Insufficient unshETH");
        uint256 shareOfUnsheth = 1e18*amount/IERC20(unshETHAddress).totalSupply();
        uint256 fee = shareOfUnsheth*redeemFee/10000; //redeem fees are 100% retained by remaining unshETH holders
        IunshETH(unshETHAddress).minter_burn_from(msg.sender, amount);
        for (uint256 i = 0; i < supportedLSDs.length; i = unchkIncr(i)) {
            uint256 lsdBalance = IERC20(supportedLSDs[i]).balanceOf(address(this));
            uint256 amountPerLsd = (shareOfUnsheth-fee)*lsdBalance/1e18;
            IERC20(supportedLSDs[i]).safeTransfer(msg.sender, amountPerLsd);
        }
    }

    //============================================================================
    //Timelock functions
    //============================================================================
    function createTimelockProposal(TimelockFunctions _fn, address _proposedAddress) public onlyOwner {
        require(_proposedAddress != address(0), "Cannot propose zero address");
        uint256 unlockTime = block.timestamp + _TIMELOCK;
        timelock[_fn] = TimelockProposal(_proposedAddress, unlockTime);
        emit TimelockUpdateProposed(_fn, _proposedAddress, unlockTime);
    }

    function cancelTimelockProposal(TimelockFunctions _fn) public onlyOwner {
        timelock[_fn] = TimelockProposal(address(0), 0);
        emit TimelockUpdateCanceled(_fn);
    }

    function _completeTimelockProposal(TimelockFunctions _fn) internal onlyOwner {
        timelock[_fn] = TimelockProposal(address(0), 0);
        emit TimelockUpdateCompleted(_fn);
    }

    function updateUnshethZapAddress() external onlyOwner timelockUnlocked(TimelockFunctions.ZAP) {
        unshethZapAddress = timelock[TimelockFunctions.ZAP].proposedAddress;
        _completeTimelockProposal(TimelockFunctions.ZAP);
    }

    function updateDarknetAddress() external onlyOwner timelockUnlocked(TimelockFunctions.DARKNET) {
        darknetAddress = timelock[TimelockFunctions.DARKNET].proposedAddress;
        _completeTimelockProposal(TimelockFunctions.DARKNET);
    }

    function migrateVault() external onlyOwner postShanghai timelockUnlocked(TimelockFunctions.MIGRATE) {
        require(IunshETH(unshETHAddress).timelock_address() == address(this), "LSDVault cannot change unshETH minter");
        address proposedVaultAddress = timelock[TimelockFunctions.MIGRATE].proposedAddress;
        for (uint256 i = 0; i < supportedLSDs.length; i = unchkIncr(i)) {
            uint256 balance = IERC20(supportedLSDs[i]).balanceOf(address(this));
            IERC20(supportedLSDs[i]).safeTransfer(proposedVaultAddress, balance);
        }
        IunshETH unshETH = IunshETH(unshETHAddress);
        unshETH.addMinter(proposedVaultAddress);
        unshETH.setTimelock(proposedVaultAddress);
        unshETH.removeMinter(address(this));
        migrated = true;
        _completeTimelockProposal(TimelockFunctions.MIGRATE);
    }

    function setVdAmm() external onlyOwner postShanghai timelockUnlocked(TimelockFunctions.AMM) {
        //revoke approvals to current swapper
        if(swapperAddress != address(0)) {
            _setApprovals(swapperAddress, 0);
        }
        //give max approvals to proposed swapper
        address proposedSwapper = timelock[TimelockFunctions.AMM].proposedAddress;
        _setApprovals(proposedSwapper, type(uint256).max);
        swapperAddress = proposedSwapper;
        ammEnabled = true;
        _completeTimelockProposal(TimelockFunctions.AMM);
    }

    function _setApprovals(address spender, uint256 limit) internal {
        for (uint256 i = 0; i < supportedLSDs.length; i = unchkIncr(i)) {
            TransferHelper.safeApprove(supportedLSDs[i], spender, limit);
        }
    }

    //============================================================================
    //Admin and emergency functions
    //============================================================================
    function updateShanghaiTime(uint256 _newTime) external onlyOwnerOrAdmin {
        require(_newTime < shanghaiTime + 4 weeks, "Cannot extend more than 4 weeks" );
        require(_newTime > block.timestamp, "Cannot set shanghaiTime in the past" );
        shanghaiTime = _newTime;
        emit ShanghaiTimeUpdated(shanghaiTime);
    }

    function pauseDeposits() external onlyOwnerOrAdmin {
        require(depositsPaused == false, "Already paused" );
        depositsPaused = true;
        emit DepositPauseToggled(depositsPaused);
    }
    
    function pauseWithdrawals(uint256 _unpauseTime) external onlyOwnerOrAdmin {
        //Max admin withdrawal pause is 1 day less than timelock (2 days), can't unpause again for 1 day after prev pause ends
        require(_unpauseTime <= block.timestamp + _TIMELOCK - 1 days, "Cannot pause withdrawals too long");
        require(block.timestamp >= withdrawalUnpauseTime + 1 days, "Need 1 day cooldown before pausing again");
        withdrawalUnpauseTime = _unpauseTime;
        withdrawalsPaused = true;
        emit WithdrawalsPaused(withdrawalUnpauseTime);
    }

    function unpauseWithdrawals() external onlyOwnerOrAdmin {
        withdrawalsPaused = false;
        emit WithdrawalsUnpaused();
    }

    function disableVdAmm() external onlyOwnerOrAdmin {
        require(swapperAddress != address(0), "Vdamm is not set");
        _setApprovals(swapperAddress, 0);
        emit VdAmmDisabled(swapperAddress);
    }

}