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// SPDX-License-Identifier: MIT

pragma solidity 0.8.20;

import "@openzeppelin/contracts-upgradeable/utils/ReentrancyGuardUpgradeable.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "./access/AdminControlUpgradeable.sol";
import "./utils/ERC3525TransferHelper.sol";
import "./external/IERC3525.sol";
import "./ISolvBTCMultiAssetPool.sol";
import "./ISolvBTC.sol";

contract SolvBTCMultiAssetPool is ISolvBTCMultiAssetPool, ReentrancyGuardUpgradeable, AdminControlUpgradeable {
    struct SftSlotInfo {
        uint256 holdingValueSftId;
        address erc20;
        bool depositAllowed;
        bool withdrawAllowed;
    }

    mapping(address => mapping(uint256 => SftSlotInfo)) internal _sftSlotInfos;

    event AddSftSlot(address indexed sft, uint256 indexed slot, address indexed erc20, uint256 holdingValueSftId);
    event SftSlotAllowedChanged(address indexed sft, uint256 indexed slot, bool depositAllowed, bool withdrawAllowed);
    event Deposit(
        address indexed owner, address indexed sft, uint256 indexed slot, address erc20, uint256 sftId, uint256 value
    );
    event Withdraw(
        address indexed owner, address indexed sft, uint256 indexed slot, address erc20, uint256 sftId, uint256 value
    );

    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor() {
        _disableInitializers();
    }

    function initialize() external virtual initializer {
        AdminControlUpgradeable.__AdminControl_init(msg.sender);
        ReentrancyGuardUpgradeable.__ReentrancyGuard_init();
    }

    function deposit(address sft_, uint256 sftId_, uint256 value_) external virtual override nonReentrant {
        require(value_ > 0, "SolvBTCMultiAssetPool: deposit amount cannot be 0");
        require(msg.sender == IERC3525(sft_).ownerOf(sftId_), "SolvBTCMultiAssetPool: caller is not sft owner");

        uint256 slot = IERC3525(sft_).slotOf(sftId_);
        SftSlotInfo storage sftSlotInfo = _sftSlotInfos[sft_][slot];
        require(sftSlotInfo.depositAllowed, "SolvBTCMultiAssetPool: sft slot deposit not allowed");

        uint256 sftBalance = IERC3525(sft_).balanceOf(sftId_);
        if (value_ == sftBalance) {
            ERC3525TransferHelper.doTransferIn(sft_, msg.sender, sftId_);
            if (sftSlotInfo.holdingValueSftId == 0) {
                sftSlotInfo.holdingValueSftId = sftId_;
            } else {
                ERC3525TransferHelper.doTransfer(sft_, sftId_, sftSlotInfo.holdingValueSftId, value_);
                ERC3525TransferHelper.doTransferOut(sft_, 0x000000000000000000000000000000000000dEaD, sftId_);
            }
        } else if (value_ < sftBalance) {
            if (sftSlotInfo.holdingValueSftId == 0) {
                sftSlotInfo.holdingValueSftId = ERC3525TransferHelper.doTransferIn(sft_, sftId_, value_);
            } else {
                ERC3525TransferHelper.doTransfer(sft_, sftId_, sftSlotInfo.holdingValueSftId, value_);
            }
        } else {
            revert("SolvBTCMultiAssetPool: deposit amount exceeds sft balance");
        }

        ISolvBTC(sftSlotInfo.erc20).mint(msg.sender, value_);
        emit Deposit(msg.sender, sft_, slot, sftSlotInfo.erc20, sftId_, value_);
    }

    function withdraw(address sft_, uint256 slot_, uint256 sftId_, uint256 value_)
        external
        virtual
        override
        nonReentrant
        returns (uint256 toSftId_)
    {
        require(value_ > 0, "SolvBTCMultiAssetPool: withdraw amount cannot be 0");

        SftSlotInfo storage sftSlotInfo = _sftSlotInfos[sft_][slot_];
        require(sftSlotInfo.withdrawAllowed, "SolvBTCMultiAssetPool: sft slot not allowed");

        uint256 sftSlotBalance = getSftSlotBalance(sft_, slot_);
        require(value_ <= sftSlotBalance, "SolvBTCMultiAssetPool: insufficient balance");

        ISolvBTC(sftSlotInfo.erc20).burn(msg.sender, value_);

        if (sftId_ == 0) {
            toSftId_ = ERC3525TransferHelper.doTransferOut(sft_, sftSlotInfo.holdingValueSftId, msg.sender, value_);
        } else {
            require(slot_ == IERC3525(sft_).slotOf(sftId_), "SolvBTCMultiAssetPool: slot not matched");
            require(msg.sender == IERC3525(sft_).ownerOf(sftId_), "SolvBTCMultiAssetPool: caller is not sft owner");
            ERC3525TransferHelper.doTransfer(sft_, sftSlotInfo.holdingValueSftId, sftId_, value_);
            toSftId_ = sftId_;
        }

        emit Withdraw(msg.sender, sft_, slot_, sftSlotInfo.erc20, toSftId_, value_);
    }

    function addSftSlotOnlyAdmin(address sft_, uint256 slot_, address erc20_, uint256 holdingValueSftId_)
        external
        virtual
        onlyAdmin
    {
        SftSlotInfo storage sftSlotInfo = _sftSlotInfos[sft_][slot_];
        require(sftSlotInfo.erc20 == address(0), "SolvBTCMultiAssetPool: sft slot already existed");
        require(
            IERC3525(sft_).valueDecimals() == IERC20Metadata(erc20_).decimals(),
            "SolvBTCMultiAssetPool: decimals not matched"
        );
        if (holdingValueSftId_ > 0) {
            require(IERC3525(sft_).slotOf(holdingValueSftId_) == slot_, "SolvBTCMultiAssetPool: slot not matched");
            require(
                IERC3525(sft_).ownerOf(holdingValueSftId_) == address(this), "SolvBTCMultiAssetPool: sftId not owned"
            );
        }

        sftSlotInfo.holdingValueSftId = holdingValueSftId_;
        sftSlotInfo.erc20 = erc20_;
        sftSlotInfo.depositAllowed = true;
        sftSlotInfo.withdrawAllowed = true;
        emit AddSftSlot(sft_, slot_, erc20_, holdingValueSftId_);
    }

    function changeSftSlotAllowedOnlyAdmin(address sft_, uint256 slot_, bool depositAllowed_, bool withdrawAllowed_)
        external
        virtual
        onlyAdmin
    {
        SftSlotInfo storage sftSlotInfo = _sftSlotInfos[sft_][slot_];
        require(sftSlotInfo.erc20 != address(0), "SolvBTCMultiAssetPool: sft slot not existed");

        sftSlotInfo.depositAllowed = depositAllowed_;
        sftSlotInfo.withdrawAllowed = withdrawAllowed_;
        emit SftSlotAllowedChanged(sft_, slot_, depositAllowed_, withdrawAllowed_);
    }

    function isSftSlotDepositAllowed(address sft_, uint256 slot_) public view virtual override returns (bool) {
        return _sftSlotInfos[sft_][slot_].depositAllowed;
    }

    function isSftSlotWithdrawAllowed(address sft_, uint256 slot_) public view virtual override returns (bool) {
        return _sftSlotInfos[sft_][slot_].withdrawAllowed;
    }

    function getERC20(address sft_, uint256 slot_) public view virtual override returns (address) {
        return _sftSlotInfos[sft_][slot_].erc20;
    }

    function getHoldingValueSftId(address sft_, uint256 slot_) public view virtual override returns (uint256) {
        return _sftSlotInfos[sft_][slot_].holdingValueSftId;
    }

    function getSftSlotBalance(address sft_, uint256 slot_) public view virtual override returns (uint256) {
        SftSlotInfo storage sftSlotInfo = _sftSlotInfos[sft_][slot_];
        return sftSlotInfo.holdingValueSftId == 0 ? 0 : IERC3525(sft_).balanceOf(sftSlotInfo.holdingValueSftId);
    }

    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.20;

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Storage of the initializable contract.
     *
     * It's implemented on a custom ERC-7201 namespace to reduce the risk of storage collisions
     * when using with upgradeable contracts.
     *
     * @custom:storage-location erc7201:openzeppelin.storage.Initializable
     */
    struct InitializableStorage {
        /**
         * @dev Indicates that the contract has been initialized.
         */
        uint64 _initialized;
        /**
         * @dev Indicates that the contract is in the process of being initialized.
         */
        bool _initializing;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Initializable")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant INITIALIZABLE_STORAGE = 0xf0c57e16840df040f15088dc2f81fe391c3923bec73e23a9662efc9c229c6a00;

    /**
     * @dev The contract is already initialized.
     */
    error InvalidInitialization();

    /**
     * @dev The contract is not initializing.
     */
    error NotInitializing();

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint64 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that in the context of a constructor an `initializer` may be invoked any
     * number of times. This behavior in the constructor can be useful during testing and is not expected to be used in
     * production.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        // Cache values to avoid duplicated sloads
        bool isTopLevelCall = !$._initializing;
        uint64 initialized = $._initialized;

        // Allowed calls:
        // - initialSetup: the contract is not in the initializing state and no previous version was
        //                 initialized
        // - construction: the contract is initialized at version 1 (no reininitialization) and the
        //                 current contract is just being deployed
        bool initialSetup = initialized == 0 && isTopLevelCall;
        bool construction = initialized == 1 && address(this).code.length == 0;

        if (!initialSetup && !construction) {
            revert InvalidInitialization();
        }
        $._initialized = 1;
        if (isTopLevelCall) {
            $._initializing = true;
        }
        _;
        if (isTopLevelCall) {
            $._initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: Setting the version to 2**64 - 1 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint64 version) {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing || $._initialized >= version) {
            revert InvalidInitialization();
        }
        $._initialized = version;
        $._initializing = true;
        _;
        $._initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        _checkInitializing();
        _;
    }

    /**
     * @dev Reverts if the contract is not in an initializing state. See {onlyInitializing}.
     */
    function _checkInitializing() internal view virtual {
        if (!_isInitializing()) {
            revert NotInitializing();
        }
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing) {
            revert InvalidInitialization();
        }
        if ($._initialized != type(uint64).max) {
            $._initialized = type(uint64).max;
            emit Initialized(type(uint64).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint64) {
        return _getInitializableStorage()._initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _getInitializableStorage()._initializing;
    }

    /**
     * @dev Returns a pointer to the storage namespace.
     */
    // solhint-disable-next-line var-name-mixedcase
    function _getInitializableStorage() private pure returns (InitializableStorage storage $) {
        assembly {
            $.slot := INITIALIZABLE_STORAGE
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @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 ReentrancyGuardUpgradeable is Initializable {
    // 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;

    /// @custom:storage-location erc7201:openzeppelin.storage.ReentrancyGuard
    struct ReentrancyGuardStorage {
        uint256 _status;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.ReentrancyGuard")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant ReentrancyGuardStorageLocation = 0x9b779b17422d0df92223018b32b4d1fa46e071723d6817e2486d003becc55f00;

    function _getReentrancyGuardStorage() private pure returns (ReentrancyGuardStorage storage $) {
        assembly {
            $.slot := ReentrancyGuardStorageLocation
        }
    }

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    function __ReentrancyGuard_init() internal onlyInitializing {
        __ReentrancyGuard_init_unchained();
    }

    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        $._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 making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if ($._status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        $._status = ENTERED;
    }

    function _nonReentrantAfter() private {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        $._status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        return $._status == ENTERED;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.20;

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

/**
 * @dev Interface for the optional metadata functions from the ERC20 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 v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the 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 v5.0.0) (utils/introspection/IERC165.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * 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[EIP 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);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.20;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";

abstract contract AdminControlUpgradeable is Initializable {

    event NewAdmin(address oldAdmin, address newAdmin);
    event NewPendingAdmin(address oldPendingAdmin, address newPendingAdmin);

    address public admin;
    address public pendingAdmin;

    modifier onlyAdmin() {
        require(msg.sender == admin, "only admin");
        _;
    }

    modifier onlyPendingAdmin() {
        require(msg.sender == pendingAdmin, "only pending admin");
        _;
    }

    function __AdminControl_init(address admin_) internal onlyInitializing {
        __AdminControl_init_unchained(admin_);
    }

    function __AdminControl_init_unchained(address admin_) internal onlyInitializing {
        admin = admin_;
        emit NewAdmin(address(0), admin_);
    }

    function transferAdmin(address newPendingAdmin_) external virtual onlyAdmin {
        emit NewPendingAdmin(pendingAdmin, newPendingAdmin_);
        pendingAdmin = newPendingAdmin_;        
    }

    function acceptAdmin() external virtual onlyPendingAdmin {
        emit NewAdmin(admin, pendingAdmin);
        admin = pendingAdmin;
        delete pendingAdmin;
    }

    uint256[48] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.20;

import "./IERC721.sol";

interface IERC3525 is IERC721 {
    function valueDecimals() external view returns (uint8);
    function balanceOf(uint256 tokenId) external view returns (uint256);
    function slotOf(uint256 tokenId) external view returns (uint256);
    function allowance(uint256 tokenId, address operator) external view returns (uint256);
    
    function approve(address operator, uint256 tokenId) external payable;
    function approve(uint256 tokenId, address operator, uint256 value) external payable;
    function transferFrom(uint256 fromTokenId, uint256 toTokenId, uint256 value) external payable;
    function transferFrom(uint256 fromTokenId, address to, uint256 value) external payable returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.20;

interface IERC3525Receiver {
    function onERC3525Received(address operator, uint256 fromTokenId, uint256 toTokenId, uint256 value, bytes calldata data) external returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.20;

interface IERC721 {
    function balanceOf(address owner) external view returns (uint256);
    function ownerOf(uint256 tokenId) external view returns (address);
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);
    function getApproved(uint256 tokenId) external view returns (address);
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    function approve(address approved, uint256 tokenId) external payable;
    function setApprovalForAll(address operator, bool approved) external;
    function transferFrom(address from, address to, uint256 tokenId) external payable;
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external payable;
    function safeTransferFrom(address from, address to, uint256 tokenId) external payable;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.20;

interface IERC721Receiver {
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.20;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import "./external/IERC721Receiver.sol";
import "./external/IERC3525Receiver.sol";

interface ISolvBTC is IERC20, IERC721Receiver, IERC3525Receiver, IERC165 {

    error ERC721NotReceivable(address token);
    error ERC3525NotReceivable(address token);

    function mint(address account, uint256 value) external;
    function burn(address account, uint256 value) external;
    function burn(uint256 value) external;

    function solvBTCMultiAssetPool() external view returns (address);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.20;

interface ISolvBTCMultiAssetPool {
    function deposit(address sft_, uint256 sftId_, uint256 value_) external;
    function withdraw(address sft, uint256 slot, uint256 sftId, uint256 value) external returns (uint256 toSftId_);

    function isSftSlotDepositAllowed(address sft_, uint256 slot_) external view returns (bool);
    function isSftSlotWithdrawAllowed(address sft_, uint256 slot_) external view returns (bool);
    function getERC20(address sft_, uint256 slot_) external view returns (address);
    function getHoldingValueSftId(address sft_, uint256 slot_) external view returns (uint256);
    function getSftSlotBalance(address sft_, uint256 slot_) external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.20;

interface ERC721Interface {
    function approve(address to, uint256 tokenId) external;
    function transferFrom(address from, address to, uint256 tokenId) external;
    function safeTransferFrom(address from, address to, uint256 tokenId) external;
}

interface ERC3525Interface {
    function approve(uint256 tokenId, address to, uint256 allowance) external payable;
    function transferFrom(uint256 fromTokenId, uint256 toTokenId, uint256 value) external payable;
    function transferFrom(uint256 fromTokenId, address to, uint256 value) external payable returns (uint256); 
}

library ERC3525TransferHelper {
    function doApproveId(address underlying, address to, uint256 tokenId) internal {
        ERC721Interface token = ERC721Interface(underlying);
        token.approve(to, tokenId);
    }

    function doApproveValue(address underlying, uint256 tokenId, address to, uint256 allowance) internal {
        ERC3525Interface token = ERC3525Interface(underlying);
        token.approve(tokenId, to, allowance);
    }

    function doTransferIn(address underlying, address from, uint256 tokenId) internal {
        ERC721Interface token = ERC721Interface(underlying);
        token.transferFrom(from, address(this), tokenId);
    }
    
    function doSafeTransferIn(address underlying, address from, uint256 tokenId) internal {
        ERC721Interface token = ERC721Interface(underlying);
        token.safeTransferFrom(from, address(this), tokenId);
    }

    function doSafeTransferOut(address underlying, address to, uint256 tokenId) internal {
        ERC721Interface token = ERC721Interface(underlying);
        token.safeTransferFrom(address(this), to, tokenId);
    }

    function doTransferOut(address underlying, address to, uint256 tokenId) internal {
        ERC721Interface token = ERC721Interface(underlying);
        token.transferFrom(address(this), to, tokenId);
    }

    function doTransferIn(address underlying, uint256 fromTokenId, uint256 value) internal returns (uint256 newTokenId) {
        ERC3525Interface token = ERC3525Interface(underlying);
        return token.transferFrom(fromTokenId, address(this), value);
    }

    function doTransferOut(address underlying, uint256 fromTokenId, address to, uint256 value) internal returns (uint256 newTokenId) {
        ERC3525Interface token = ERC3525Interface(underlying);
        newTokenId = token.transferFrom(fromTokenId, to, value);
    }

    function doTransfer(address underlying, address from, address to, uint256 tokenId) internal {
        ERC721Interface token = ERC721Interface(underlying);
        token.transferFrom(from, to, tokenId);
    }

    function doTransfer(address underlying, uint256 fromTokenId, uint256 toTokenId, uint256 value) internal {
        ERC3525Interface token = ERC3525Interface(underlying);
        token.transferFrom(fromTokenId, toTokenId, value);
    }

}

{
  "optimizer": {
    "enabled": true,
    "runs": 1
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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internalType":"address","name":"sft_","type":"address"},{"internalType":"uint256","name":"slot_","type":"uint256"}],"name":"isSftSlotWithdrawAllowed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingAdmin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newPendingAdmin_","type":"address"}],"name":"transferAdmin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sft_","type":"address"},{"internalType":"uint256","name":"slot_","type":"uint256"},{"internalType":"uint256","name":"sftId_","type":"uint256"},{"internalType":"uint256","name":"value_","type":"uint256"}],"name":"withdraw","outputs":[{"internalType":"uint256","name":"toSftId_","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}]

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