// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/proxy/ERC1967/ERC1967Proxy.sol";
import "@openzeppelin/contracts/proxy/transparent/TransparentUpgradeableProxy.sol";
import "@openzeppelin/contracts/proxy/transparent/ProxyAdmin.sol";
// Kept for backwards compatibility with older versions of Hardhat and Truffle plugins.
contract AdminUpgradeabilityProxy is TransparentUpgradeableProxy {
    constructor(address logic, address admin, bytes memory data) payable TransparentUpgradeableProxy(logic, admin, data) {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../Proxy.sol";
import "./ERC1967Upgrade.sol";
/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 */
contract ERC1967Proxy is Proxy, ERC1967Upgrade {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     *
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _upgradeToAndCall(_logic, _data, false);
    }
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view virtual override returns (address impl) {
        return ERC1967Upgrade._getImplementation();
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../ERC1967/ERC1967Proxy.sol";
/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 *
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 *
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 *
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 *
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative interface of your proxy.
 */
contract TransparentUpgradeableProxy is ERC1967Proxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {ERC1967Proxy-constructor}.
     */
    constructor(address _logic, address admin_, bytes memory _data) payable ERC1967Proxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _changeAdmin(admin_);
    }
    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _getAdmin()) {
            _;
        } else {
            _fallback();
        }
    }
    /**
     * @dev Returns the current admin.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address admin_) {
        admin_ = _getAdmin();
    }
    /**
     * @dev Returns the current implementation.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address implementation_) {
        implementation_ = _implementation();
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external virtual ifAdmin {
        _changeAdmin(newAdmin);
    }
    /**
     * @dev Upgrade the implementation of the proxy.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeToAndCall(newImplementation, bytes(""), false);
    }
    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeToAndCall(newImplementation, data, true);
    }
    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view virtual returns (address) {
        return _getAdmin();
    }
    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal virtual override {
        require(msg.sender != _getAdmin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./TransparentUpgradeableProxy.sol";
import "../../access/Ownable.sol";
/**
 * @dev This is an auxiliary contract meant to be assigned as the admin of a {TransparentUpgradeableProxy}. For an
 * explanation of why you would want to use this see the documentation for {TransparentUpgradeableProxy}.
 */
contract ProxyAdmin is Ownable {
    /**
     * @dev Returns the current implementation of `proxy`.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function getProxyImplementation(TransparentUpgradeableProxy proxy) public view virtual returns (address) {
        // We need to manually run the static call since the getter cannot be flagged as view
        // bytes4(keccak256("implementation()")) == 0x5c60da1b
        (bool success, bytes memory returndata) = address(proxy).staticcall(hex"5c60da1b");
        require(success);
        return abi.decode(returndata, (address));
    }
    /**
     * @dev Returns the current admin of `proxy`.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function getProxyAdmin(TransparentUpgradeableProxy proxy) public view virtual returns (address) {
        // We need to manually run the static call since the getter cannot be flagged as view
        // bytes4(keccak256("admin()")) == 0xf851a440
        (bool success, bytes memory returndata) = address(proxy).staticcall(hex"f851a440");
        require(success);
        return abi.decode(returndata, (address));
    }
    /**
     * @dev Changes the admin of `proxy` to `newAdmin`.
     *
     * Requirements:
     *
     * - This contract must be the current admin of `proxy`.
     */
    function changeProxyAdmin(TransparentUpgradeableProxy proxy, address newAdmin) public virtual onlyOwner {
        proxy.changeAdmin(newAdmin);
    }
    /**
     * @dev Upgrades `proxy` to `implementation`. See {TransparentUpgradeableProxy-upgradeTo}.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function upgrade(TransparentUpgradeableProxy proxy, address implementation) public virtual onlyOwner {
        proxy.upgradeTo(implementation);
    }
    /**
     * @dev Upgrades `proxy` to `implementation` and calls a function on the new implementation. See
     * {TransparentUpgradeableProxy-upgradeToAndCall}.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function upgradeAndCall(TransparentUpgradeableProxy proxy, address implementation, bytes memory data) public payable virtual onlyOwner {
        proxy.upgradeToAndCall{value: msg.value}(implementation, data);
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())
            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())
            switch result
            // delegatecall returns 0 on error.
            case 0 { revert(0, returndatasize()) }
            default { return(0, returndatasize()) }
        }
    }
    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);
    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback () external payable virtual {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive () external payable virtual {
        _fallback();
    }
    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.2;
import "../beacon/IBeacon.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";
/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967Upgrade {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }
    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(address newImplementation, bytes memory data, bool forceCall) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }
    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallSecure(address newImplementation, bytes memory data, bool forceCall) internal {
        address oldImplementation = _getImplementation();
        // Initial upgrade and setup call
        _setImplementation(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
        // Perform rollback test if not already in progress
        StorageSlot.BooleanSlot storage rollbackTesting = StorageSlot.getBooleanSlot(_ROLLBACK_SLOT);
        if (!rollbackTesting.value) {
            // Trigger rollback using upgradeTo from the new implementation
            rollbackTesting.value = true;
            Address.functionDelegateCall(
                newImplementation,
                abi.encodeWithSignature(
                    "upgradeTo(address)",
                    oldImplementation
                )
            );
            rollbackTesting.value = false;
            // Check rollback was effective
            require(oldImplementation == _getImplementation(), "ERC1967Upgrade: upgrade breaks further upgrades");
            // Finally reset to the new implementation and log the upgrade
            _setImplementation(newImplementation);
            emit Upgraded(newImplementation);
        }
    }
    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(address newBeacon, bytes memory data, bool forceCall) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
    /**
     * @dev Emitted when the beacon is upgraded.
     */
    event BeaconUpgraded(address indexed beacon);
    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }
    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(
            Address.isContract(newBeacon),
            "ERC1967: new beacon is not a contract"
        );
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
 * @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);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }
    struct BooleanSlot {
        bool value;
    }
    struct Bytes32Slot {
        bytes32 value;
    }
    struct Uint256Slot {
        uint256 value;
    }
    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}
// SPDX-License-Identifier: MIT
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 () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: MIT
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) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../ERC1967/ERC1967Upgrade.sol";
/**
 * @dev Base contract for building openzeppelin-upgrades compatible implementations for the {ERC1967Proxy}. It includes
 * publicly available upgrade functions that are called by the plugin and by the secure upgrade mechanism to verify
 * continuation of the upgradability.
 *
 * The {_authorizeUpgrade} function MUST be overridden to include access restriction to the upgrade mechanism.
 *
 * _Available since v4.1._
 */
abstract contract UUPSUpgradeable is ERC1967Upgrade {
    function upgradeTo(address newImplementation) external virtual {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallSecure(newImplementation, bytes(""), false);
    }
    function upgradeToAndCall(address newImplementation, bytes memory data) external payable virtual {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallSecure(newImplementation, data, true);
    }
    function _authorizeUpgrade(address newImplementation) internal virtual;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.2;
import "@openzeppelin/contracts/proxy/utils/UUPSUpgradeable.sol";
abstract contract Proxiable is UUPSUpgradeable {
    function _authorizeUpgrade(address newImplementation) internal override {
        _beforeUpgrade(newImplementation);
    }
    function _beforeUpgrade(address newImplementation) internal virtual;
}
contract ChildOfProxiable is Proxiable {
    function _beforeUpgrade(address newImplementation) internal virtual override {}
}

{"Address.sol":{"content":"// SPDX-License-Identifier: MIT\npragma solidity \u003e0.6.99 \u003c0.8.0;\n\n/**\n * @dev Collection of functions related to the address type\n */\nlibrary Address {\n    /**\n     * @dev Returns true if `account` is a contract.\n     *\n     * [IMPORTANT]\n     * ====\n     * It is unsafe to assume that an address for which this function returns\n     * false is an externally-owned account (EOA) and not a contract.\n     *\n     * Among others, `isContract` will return false for the following\n     * types of addresses:\n     *\n     *  - an externally-owned account\n     *  - a contract in construction\n     *  - an address where a contract will be created\n     *  - an address where a contract lived, but was destroyed\n     * ====\n     */\n    function isContract(address account) internal view returns (bool) {\n        // This method relies in extcodesize, which returns 0 for contracts in\n        // construction, since the code is only stored at the end of the\n        // constructor execution.\n\n        uint256 size;\n        // solhint-disable-next-line no-inline-assembly\n        assembly { size := extcodesize(account) }\n        return size \u003e 0;\n    }\n\n    /**\n     * @dev Replacement for Solidity\u0027s `transfer`: sends `amount` wei to\n     * `recipient`, forwarding all available gas and reverting on errors.\n     *\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\n     * imposed by `transfer`, making them unable to receive funds via\n     * `transfer`. {sendValue} removes this limitation.\n     *\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\n     *\n     * IMPORTANT: because control is transferred to `recipient`, care must be\n     * taken to not create reentrancy vulnerabilities. Consider using\n     * {ReentrancyGuard} or the\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\n     */\n    function sendValue(address payable recipient, uint256 amount) internal {\n        require(address(this).balance \u003e= amount, \"Address: insufficient balance\");\n\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\n        (bool success, ) = recipient.call{ value: amount }(\"\");\n        require(success, \"Address: unable to send value, recipient may have reverted\");\n    }\n\n    /**\n     * @dev Performs a Solidity function call using a low level `call`. A\n     * plain`call` is an unsafe replacement for a function call: use this\n     * function instead.\n     *\n     * If `target` reverts with a revert reason, it is bubbled up by this\n     * function (like regular Solidity function calls).\n     *\n     * Returns the raw returned data. To convert to the expected return value,\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\n     *\n     * Requirements:\n     *\n     * - `target` must be a contract.\n     * - calling `target` with `data` must not revert.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(address target, bytes memory data) internal returns (bytes memory) {\n      return functionCall(target, data, \"Address: low-level call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\n     * `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {\n        return _functionCallWithValue(target, data, 0, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but also transferring `value` wei to `target`.\n     *\n     * Requirements:\n     *\n     * - the calling contract must have an ETH balance of at least `value`.\n     * - the called Solidity function must be `payable`.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {\n        require(address(this).balance \u003e= value, \"Address: insufficient balance for call\");\n        return _functionCallWithValue(target, data, value, errorMessage);\n    }\n\n    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {\n        require(isContract(target), \"Address: call to non-contract\");\n\n        // solhint-disable-next-line avoid-low-level-calls\n        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);\n        if (success) {\n            return returndata;\n        } else {\n            // Look for revert reason and bubble it up if present\n            if (returndata.length \u003e 0) {\n                // The easiest way to bubble the revert reason is using memory via assembly\n\n                // solhint-disable-next-line no-inline-assembly\n                assembly {\n                    let returndata_size := mload(returndata)\n                    revert(add(32, returndata), returndata_size)\n                }\n            } else {\n                revert(errorMessage);\n            }\n        }\n    }\n}\n"},"Context.sol":{"content":"// SPDX-License-Identifier: MIT\npragma solidity \u003e0.6.99 \u003c0.8.0;\n\n/**\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with GSN meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\nabstract contract Context {\n    function _msgSender() internal view virtual returns (address payable) {\n        return msg.sender;\n    }\n\n    function _msgData() internal view virtual returns (bytes memory) {\n        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691\n        return msg.data;\n    }\n}\n"},"IERC20.sol":{"content":"// SPDX-License-Identifier: MIT\npragma solidity \u003e0.6.99 \u003c0.8.0;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n */\ninterface IERC20 {\n    /**\n     * @dev Returns the amount of tokens in existence.\n     */\n    function totalSupply() external view returns (uint256);\n\n    /**\n     * @dev Returns the amount of tokens owned by `account`.\n     */\n    function balanceOf(address account) external view returns (uint256);\n\n    /**\n     * @dev Moves `amount` tokens from the caller\u0027s account to `recipient`.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transfer(address recipient, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Returns the remaining number of tokens that `spender` will be\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\n     * zero by default.\n     *\n     * This value changes when {approve} or {transferFrom} are called.\n     */\n    function allowance(address owner, address spender) external view returns (uint256);\n\n    /**\n     * @dev Sets `amount` as the allowance of `spender` over the caller\u0027s tokens.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\n     * that someone may use both the old and the new allowance by unfortunate\n     * transaction ordering. One possible solution to mitigate this race\n     * condition is to first reduce the spender\u0027s allowance to 0 and set the\n     * desired value afterwards:\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n     *\n     * Emits an {Approval} event.\n     */\n    function approve(address spender, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\n     * allowance mechanism. `amount` is then deducted from the caller\u0027s\n     * allowance.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\n     * another (`to`).\n     *\n     * Note that `value` may be zero.\n     */\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    /**\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n     * a call to {approve}. `value` is the new allowance.\n     */\n    event Approval(address indexed owner, address indexed spender, uint256 value);\n}\n"},"SafeMath.sol":{"content":"// SPDX-License-Identifier: MIT\npragma solidity \u003e0.6.99 \u003c0.8.0;\n\n/**\n * @dev Wrappers over Solidity\u0027s arithmetic operations with added overflow\n * checks.\n *\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\n * in bugs, because programmers usually assume that an overflow raises an\n * error, which is the standard behavior in high level programming languages.\n * `SafeMath` restores this intuition by reverting the transaction when an\n * operation overflows.\n *\n * Using this library instead of the unchecked operations eliminates an entire\n * class of bugs, so it\u0027s recommended to use it always.\n */\nlibrary SafeMath {\n    /**\n     * @dev Returns the addition of two unsigned integers, reverting on\n     * overflow.\n     *\n     * Counterpart to Solidity\u0027s `+` operator.\n     *\n     * Requirements:\n     *\n     * - Addition cannot overflow.\n     */\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\n        uint256 c = a + b;\n        require(c \u003e= a, \"SafeMath: addition overflow\");\n\n        return c;\n    }\n\n    /**\n     * @dev Returns the subtraction of two unsigned integers, reverting on\n     * overflow (when the result is negative).\n     *\n     * Counterpart to Solidity\u0027s `-` operator.\n     *\n     * Requirements:\n     *\n     * - Subtraction cannot overflow.\n     */\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n        return sub(a, b, \"SafeMath: subtraction overflow\");\n    }\n\n    /**\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\n     * overflow (when the result is negative).\n     *\n     * Counterpart to Solidity\u0027s `-` operator.\n     *\n     * Requirements:\n     *\n     * - Subtraction cannot overflow.\n     */\n    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n        require(b \u003c= a, errorMessage);\n        uint256 c = a - b;\n\n        return c;\n    }\n\n    /**\n     * @dev Returns the multiplication of two unsigned integers, reverting on\n     * overflow.\n     *\n     * Counterpart to Solidity\u0027s `*` operator.\n     *\n     * Requirements:\n     *\n     * - Multiplication cannot overflow.\n     */\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\n        // Gas optimization: this is cheaper than requiring \u0027a\u0027 not being zero, but the\n        // benefit is lost if \u0027b\u0027 is also tested.\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\n        if (a == 0) {\n            return 0;\n        }\n\n        uint256 c = a * b;\n        require(c / a == b, \"SafeMath: multiplication overflow\");\n\n        return c;\n    }\n\n    /**\n     * @dev Returns the integer division of two unsigned integers. Reverts on\n     * division by zero. The result is rounded towards zero.\n     *\n     * Counterpart to Solidity\u0027s `/` operator. Note: this function uses a\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\n     * uses an invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\n        return div(a, b, \"SafeMath: division by zero\");\n    }\n\n    /**\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\n     * division by zero. The result is rounded towards zero.\n     *\n     * Counterpart to Solidity\u0027s `/` operator. Note: this function uses a\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\n     * uses an invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n        require(b \u003e 0, errorMessage);\n        uint256 c = a / b;\n        // assert(a == b * c + a % b); // There is no case in which this doesn\u0027t hold\n\n        return c;\n    }\n\n    /**\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n     * Reverts when dividing by zero.\n     *\n     * Counterpart to Solidity\u0027s `%` operator. This function uses a `revert`\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\n     * invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\n        return mod(a, b, \"SafeMath: modulo by zero\");\n    }\n\n    /**\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n     * Reverts with custom message when dividing by zero.\n     *\n     * Counterpart to Solidity\u0027s `%` operator. This function uses a `revert`\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\n     * invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n        require(b != 0, errorMessage);\n        return a % b;\n    }\n}\n"},"Strong.sol":{"content":"// SPDX-License-Identifier: MIT\npragma solidity \u003e0.6.99 \u003c0.8.0;\n\nimport \"./Context.sol\";\nimport \"./IERC20.sol\";\nimport \"./SafeMath.sol\";\nimport \"./Address.sol\";\n\n/**\n * @dev Implementation of the {IERC20} interface.\n *\n * We have followed general OpenZeppelin guidelines: functions revert instead\n * of returning `false` on failure. This behavior is nonetheless conventional\n * and does not conflict with the expectations of ERC20 applications.\n *\n * Additionally, an {Approval} event is emitted on calls to {transferFrom}.\n * This allows applications to reconstruct the allowance for all accounts just\n * by listening to said events. Other implementations of the EIP may not emit\n * these events, as it isn\u0027t required by the specification.\n *\n * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}\n * functions have been added to mitigate the well-known issues around setting\n * allowances. See {IERC20-approve}.\n */\ncontract Strong is Context, IERC20 {\n    using SafeMath for uint256;\n    using Address for address;\n\n    mapping (address =\u003e uint256) private _balances;\n\n    mapping (address =\u003e mapping (address =\u003e uint256)) private _allowances;\n\n    uint256 private _totalSupply;\n\n    string private _name = \"Strong\";\n    string private _symbol = \"STRONG\";\n    uint8 private _decimals = 18;\n\n    /**\n     * @dev Sets the specified balances for the specified addresses. \u0027addresses\u0027 and \u0027balances\u0027 arrays\n     * are to be index aligned.\n     */\n    constructor (address[] memory addresses, uint[] memory balances) {\n        require(addresses.length \u003e 0 \u0026\u0026 balances.length \u003e 0, \"STRONG: array length must be greater than zero\");\n        require(addresses.length == balances.length, \"STRONG: arrays length mismatch\");\n\n        for (uint i = 0; i \u003c addresses.length; i++) {\n            _mint(addresses[i], balances[i]);\n        }\n        require(_totalSupply == 10000000e18, \"STRONG: totalSupply must equal 10 million\");\n    }\n\n    /**\n     * @dev Returns the name of the token.\n     */\n    function name() public view returns (string memory) {\n        return _name;\n    }\n\n    /**\n     * @dev Returns the symbol of the token, usually a shorter version of the\n     * name.\n     */\n    function symbol() public view returns (string memory) {\n        return _symbol;\n    }\n\n    /**\n     * @dev Returns the number of decimals used to get its user representation.\n     * For example, if `decimals` equals `2`, a balance of `505` tokens should\n     * be displayed to a user as `5,05` (`505 / 10 ** 2`).\n     *\n     * Tokens usually opt for a value of 18, imitating the relationship between\n     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is\n     * called.\n     *\n     * NOTE: This information is only used for _display_ purposes: it in\n     * no way affects any of the arithmetic of the contract, including\n     * {IERC20-balanceOf} and {IERC20-transfer}.\n     */\n    function decimals() public view returns (uint8) {\n        return _decimals;\n    }\n\n    /**\n     * @dev See {IERC20-totalSupply}.\n     */\n    function totalSupply() public view override returns (uint256) {\n        return _totalSupply;\n    }\n\n    /**\n     * @dev See {IERC20-balanceOf}.\n     */\n    function balanceOf(address account) public view override returns (uint256) {\n        return _balances[account];\n    }\n\n    /**\n     * @dev See {IERC20-transfer}.\n     *\n     * Requirements:\n     *\n     * - `recipient` cannot be the zero address.\n     * - the caller must have a balance of at least `amount`.\n     */\n    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {\n        _transfer(_msgSender(), recipient, amount);\n        return true;\n    }\n\n    /**\n     * @dev See {IERC20-allowance}.\n     */\n    function allowance(address owner, address spender) public view virtual override returns (uint256) {\n        return _allowances[owner][spender];\n    }\n\n    /**\n     * @dev See {IERC20-approve}.\n     *\n     * Requirements:\n     *\n     * - `spender` cannot be the zero address.\n     */\n    function approve(address spender, uint256 amount) public virtual override returns (bool) {\n        _approve(_msgSender(), spender, amount);\n        return true;\n    }\n\n    /**\n     * @dev See {IERC20-transferFrom}.\n     *\n     * Emits an {Approval} event indicating the updated allowance. This is not\n     * required by the EIP. See the note at the beginning of {ERC20};\n     *\n     * Requirements:\n     * - `sender` and `recipient` cannot be the zero address.\n     * - `sender` must have a balance of at least `amount`.\n     * - the caller must have allowance for ``sender``\u0027s tokens of at least\n     * `amount`.\n     */\n    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {\n        _transfer(sender, recipient, amount);\n        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, \"STRONG: transfer amount exceeds allowance\"));\n        return true;\n    }\n\n    /**\n     * @dev Atomically increases the allowance granted to `spender` by the caller.\n     *\n     * This is an alternative to {approve} that can be used as a mitigation for\n     * problems described in {IERC20-approve}.\n     *\n     * Emits an {Approval} event indicating the updated allowance.\n     *\n     * Requirements:\n     *\n     * - `spender` cannot be the zero address.\n     */\n    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {\n        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));\n        return true;\n    }\n\n    /**\n     * @dev Atomically decreases the allowance granted to `spender` by the caller.\n     *\n     * This is an alternative to {approve} that can be used as a mitigation for\n     * problems described in {IERC20-approve}.\n     *\n     * Emits an {Approval} event indicating the updated allowance.\n     *\n     * Requirements:\n     *\n     * - `spender` cannot be the zero address.\n     * - `spender` must have allowance for the caller of at least\n     * `subtractedValue`.\n     */\n    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {\n        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, \"STRONG: decreased allowance below zero\"));\n        return true;\n    }\n\n    /**\n     * @dev Moves tokens `amount` from `sender` to `recipient`.\n     *\n     * This is internal function is equivalent to {transfer}, and can be used to\n     * e.g. implement automatic token fees, slashing mechanisms, etc.\n     *\n     * Emits a {Transfer} event.\n     *\n     * Requirements:\n     *\n     * - `sender` cannot be the zero address.\n     * - `recipient` cannot be the zero address.\n     * - `sender` must have a balance of at least `amount`.\n     */\n    function _transfer(address sender, address recipient, uint256 amount) internal virtual {\n        require(sender != address(0), \"STRONG: transfer from the zero address\");\n        require(recipient != address(0), \"STRONG: transfer to the zero address\");\n\n        _beforeTokenTransfer(sender, recipient, amount);\n\n        _balances[sender] = _balances[sender].sub(amount, \"STRONG: transfer amount exceeds balance\");\n        _balances[recipient] = _balances[recipient].add(amount);\n        emit Transfer(sender, recipient, amount);\n    }\n\n    /** @dev Creates `amount` tokens and assigns them to `account`, increasing\n     * the total supply.\n     *\n     * Emits a {Transfer} event with `from` set to the zero address.\n     *\n     * Requirements\n     *\n     * - `to` cannot be the zero address.\n     */\n    function _mint(address account, uint256 amount) internal virtual {\n        require(account != address(0), \"STRONG: mint to the zero address\");\n\n        _beforeTokenTransfer(address(0), account, amount);\n\n        _totalSupply = _totalSupply.add(amount);\n        _balances[account] = _balances[account].add(amount);\n        emit Transfer(address(0), account, amount);\n    }\n\n    /**\n     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.\n     *\n     * This is internal function is equivalent to `approve`, and can be used to\n     * e.g. set automatic allowances for certain subsystems, etc.\n     *\n     * Emits an {Approval} event.\n     *\n     * Requirements:\n     *\n     * - `owner` cannot be the zero address.\n     * - `spender` cannot be the zero address.\n     */\n    function _approve(address owner, address spender, uint256 amount) internal virtual {\n        require(owner != address(0), \"STRONG: approve from the zero address\");\n        require(spender != address(0), \"STRONG: approve to the zero address\");\n\n        _allowances[owner][spender] = amount;\n        emit Approval(owner, spender, amount);\n    }\n\n    /**\n     * @dev Hook that is called before any transfer of tokens. This includes\n     * minting and burning.\n     *\n     * Calling conditions:\n     *\n     * - when `from` and `to` are both non-zero, `amount` of ``from``\u0027s tokens\n     * will be to transferred to `to`.\n     * - when `from` is zero, `amount` tokens will be minted for `to`.\n     * - when `to` is zero, `amount` of ``from``\u0027s tokens will be burned.\n     * - `from` and `to` are never both zero.\n     *\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n     */\n    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }\n}\n"}}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;
import "./interfaces/IERC20.sol";
import "./interfaces/IMultiNode.sol";
import "./interfaces/IStrongPool.sol";
import "./interfaces/IStrongNFTBonus.sol";
import "./lib/InternalCalls.sol";
import "./lib/MultiNodeSettings.sol";
import "./lib/SbMath.sol";
contract MultiNodeV1 is IMultiNode, InternalCalls, MultiNodeSettings {
  uint private constant _SECONDS_IN_ONE_MINUTE = 60;
  IERC20 public strongToken;
  IStrongNFTBonus public strongNFTBonus;
  uint public totalNodes;
  uint public nodesLimit;
  uint public takeStrongBips;
  address payable public feeCollector;
  mapping(address => bool) private serviceContractEnabled;
  mapping(address => uint) public entityNodeCount;
  mapping(address => uint) public entityCreditUsed;
  mapping(address => mapping(uint => uint)) public entityNodeTypeCount;
  mapping(bytes => uint) public entityNodeType;
  mapping(bytes => uint) public entityNodeCreatedAt;
  mapping(bytes => uint) public entityNodeLastPaidAt;
  mapping(bytes => uint) public entityNodeLastClaimedAt;
  // Events
  event Created(address indexed entity, uint nodeType, uint nodeId, bool usedCredit, uint timestamp);
  event Paid(address indexed entity, uint nodeType, uint nodeId, uint timestamp);
  event Claimed(address indexed entity, uint nodeId, uint reward);
  event MigratedFromService(address indexed service, address indexed entity, uint nodeType, uint nodeId, uint lastPaidAt);
  event SetFeeCollector(address payable collector);
  event SetNFTBonusContract(address strongNFTBonus);
  event SetNodesLimit(uint limit);
  event SetServiceContractEnabled(address service, bool enabled);
  event SetTakeStrongBips(uint bips);
  function init(
    IERC20 _strongToken,
    IStrongNFTBonus _strongNFTBonus,
    address payable _feeCollector
  ) external onlyRole(adminControl.SUPER_ADMIN()) {
    require(_feeCollector != address(0), "no address");
    strongToken = _strongToken;
    strongNFTBonus = _strongNFTBonus;
    feeCollector = _feeCollector;
    InternalCalls.init();
  }
  //
  // Getters
  // -------------------------------------------------------------------------------------------------------------------
  function getRewardBalance() external view returns (uint) {
    return strongToken.balanceOf(address(this));
  }
  function calcDecayedReward(uint _baseRate, uint _decayFactor, uint _minutesPassed) public pure returns (uint) {
    uint power = SbMath._decPow(_decayFactor, _minutesPassed);
    uint cumulativeFraction = SbMath.DECIMAL_PRECISION - power;
    return _baseRate * cumulativeFraction / SbMath.DECIMAL_PRECISION;
  }
  function canNodeBePaid(address _entity, uint _nodeId) public view returns (bool) {
    return doesNodeExist(_entity, _nodeId) && !hasNodeExpired(_entity, _nodeId) && !hasMaxPayments(_entity, _nodeId);
  }
  function doesNodeExist(address _entity, uint _nodeId) public view returns (bool) {
    return entityNodeLastPaidAt[getNodeId(_entity, _nodeId)] > 0;
  }
  function isNodePastDue(address _entity, uint _nodeId) public view returns (bool) {
    bytes memory id = getNodeId(_entity, _nodeId);
    uint nodeType = entityNodeType[id];
    uint lastPaidAt = entityNodeLastPaidAt[id];
    return block.timestamp > (lastPaidAt + getRecurringPaymentCycle(nodeType));
  }
  function hasNodeExpired(address _entity, uint _nodeId) public view returns (bool) {
    bytes memory id = getNodeId(_entity, _nodeId);
    uint nodeType = entityNodeType[id];
    uint lastPaidAt = entityNodeLastPaidAt[id];
    if (lastPaidAt == 0) return true;
    return block.timestamp > (lastPaidAt + getRecurringPaymentCycle(nodeType) + getGracePeriod(nodeType));
  }
  function hasMaxPayments(address _entity, uint _nodeId) public view returns (bool) {
    bytes memory id = getNodeId(_entity, _nodeId);
    uint nodeType = entityNodeType[id];
    uint lastPaidAt = entityNodeLastPaidAt[id];
    uint recurringPaymentCycle = getRecurringPaymentCycle(nodeType);
    uint limit = block.timestamp + recurringPaymentCycle * getPayCyclesLimit(nodeType);
    return lastPaidAt + recurringPaymentCycle >= limit;
  }
  function getNodeId(address _entity, uint _nodeId) public view returns (bytes memory) {
    uint id = _nodeId != 0 ? _nodeId : entityNodeCount[_entity] + 1;
    return abi.encodePacked(_entity, id);
  }
  function getNodeType(address _entity, uint _nodeId) public view returns (uint) {
    return entityNodeType[getNodeId(_entity, _nodeId)];
  }
  function getNodeRecurringFee(address _entity, uint _nodeId) external view returns (uint) {
    return getRecurringFeeInWei(entityNodeType[getNodeId(_entity, _nodeId)]);
  }
  function getNodeClaimingFee(address _entity, uint _nodeId, uint _timestamp) external view returns (uint) {
    uint nodeType = entityNodeType[getNodeId(_entity, _nodeId)];
    uint reward = getRewardAt(_entity, _nodeId, _timestamp);
    return reward * getClaimingFeeNumerator(nodeType) / getClaimingFeeDenominator(nodeType);
  }
  function getNodePaidOn(address _entity, uint _nodeId) external view returns (uint) {
    return entityNodeLastPaidAt[getNodeId(_entity, _nodeId)];
  }
  function getNodeReward(address _entity, uint _nodeId) external view returns (uint) {
    return getRewardAt(_entity, _nodeId, block.timestamp);
  }
  function getRewardAt(address _entity, uint _nodeId, uint _timestamp) public view returns (uint) {
    bytes memory id = getNodeId(_entity, _nodeId);
    uint nodeType = entityNodeType[id];
    uint lastClaimedAt = entityNodeLastClaimedAt[id] != 0 ? entityNodeLastClaimedAt[id] : entityNodeCreatedAt[id];
    uint registeredAt = entityNodeCreatedAt[id];
    if (!doesNodeExist(_entity, _nodeId)) return 0;
    if (hasNodeExpired(_entity, _nodeId)) return 0;
    if (_timestamp > block.timestamp) return 0;
    if (_timestamp <= lastClaimedAt) return 0;
    uint minutesTotal = (_timestamp - registeredAt) / _SECONDS_IN_ONE_MINUTE;
    uint reward = calcDecayedReward(
      getRewardBaseRate(nodeType),
      getRewardDecayFactor(nodeType),
      minutesTotal
    );
    if (lastClaimedAt > 0) {
      uint minutesToLastClaim = (lastClaimedAt - registeredAt) / _SECONDS_IN_ONE_MINUTE;
      uint rewardAtLastClaim = calcDecayedReward(getRewardBaseRate(nodeType), getRewardDecayFactor(nodeType), minutesToLastClaim);
      reward = reward - rewardAtLastClaim;
    }
    uint bonus = getNftBonusAt(_entity, _nodeId, _timestamp);
    return reward + bonus;
  }
  function getNftBonusAt(address _entity, uint _nodeId, uint _timestamp) public view returns (uint) {
    if (address(strongNFTBonus) == address(0)) return 0;
    bytes memory id = getNodeId(_entity, _nodeId);
    uint nodeType = entityNodeType[id];
    uint lastClaimedAt = entityNodeLastClaimedAt[id] != 0 ? entityNodeLastClaimedAt[id] : entityNodeCreatedAt[id];
    string memory bonusName = strongNFTBonus.getStakedNftBonusName(_entity, uint128(_nodeId), address(this));
    if (keccak256(abi.encode(bonusName)) == keccak256(abi.encode(""))) return 0;
    uint bonusValue = getNftBonusValue(nodeType, bonusName);
    return bonusValue > 0
    ? strongNFTBonus.getBonusValue(_entity, uint128(_nodeId), lastClaimedAt, _timestamp, bonusValue)
    : 0;
  }
  function getEntityRewards(address _entity, uint _timestamp) public view returns (uint) {
    uint reward = 0;
    for (uint nodeId = 1; nodeId <= entityNodeCount[_entity]; nodeId++) {
      reward = reward + getRewardAt(_entity, nodeId, _timestamp > 0 ? _timestamp : block.timestamp);
    }
    return reward;
  }
  function getEntityCreditAvailable(address _entity, uint _timestamp) public view returns (uint) {
    return getEntityRewards(_entity, _timestamp) - entityCreditUsed[_entity];
  }
  function getNodesRecurringFee(address _entity, uint _fromNode, uint _toNode) external view returns (uint) {
    uint fee = 0;
    uint fromNode = _fromNode > 0 ? _fromNode : 1;
    uint toNode = _toNode > 0 ? _toNode : entityNodeCount[_entity];
    for (uint nodeId = fromNode; nodeId <= toNode; nodeId++) {
      if (canNodeBePaid(_entity, nodeId)) fee = fee + getRecurringFeeInWei(getNodeType(_entity, nodeId));
    }
    return fee;
  }
  function getNodesClaimingFee(address _entity, uint _timestamp, uint _fromNode, uint _toNode) external view returns (uint) {
    uint fee = 0;
    uint fromNode = _fromNode > 0 ? _fromNode : 1;
    uint toNode = _toNode > 0 ? _toNode : entityNodeCount[_entity];
    for (uint nodeId = fromNode; nodeId <= toNode; nodeId++) {
      uint reward = getRewardAt(_entity, nodeId, _timestamp > 0 ? _timestamp : block.timestamp);
      if (reward > 0) {
        uint nodeType = getNodeType(_entity, nodeId);
        fee = fee + reward * getClaimingFeeNumerator(nodeType) / getClaimingFeeDenominator(nodeType);
      }
    }
    return fee;
  }
  //
  // Actions
  // -------------------------------------------------------------------------------------------------------------------
  function createNode(uint _nodeType, bool _useCredit) external payable {
    uint fee = getCreatingFeeInWei(_nodeType);
    uint strongFee = getStrongFeeInWei(_nodeType);
    uint nodeTypeLimit = getNodesLimit(_nodeType);
    require(nodeTypeActive[_nodeType], "invalid type");
    require(nodesLimit == 0 || entityNodeCount[msg.sender] < nodesLimit, "over limit");
    require(nodeTypeLimit == 0 || entityNodeTypeCount[msg.sender][_nodeType] < nodeTypeLimit, "over limit");
    require(msg.value >= fee, "invalid fee");
    uint nodeId = entityNodeCount[msg.sender] + 1;
    bytes memory id = getNodeId(msg.sender, nodeId);
    totalNodes = totalNodes + 1;
    entityNodeType[id] = _nodeType;
    entityNodeCreatedAt[id] = block.timestamp;
    entityNodeLastPaidAt[id] = block.timestamp;
    entityNodeCount[msg.sender] = entityNodeCount[msg.sender] + 1;
    entityNodeTypeCount[msg.sender][_nodeType] = entityNodeTypeCount[msg.sender][_nodeType] + 1;
    emit Created(msg.sender, _nodeType, nodeId, _useCredit, block.timestamp);
    if (_useCredit) {
      require(getEntityCreditAvailable(msg.sender, block.timestamp) >= strongFee, "not enough");
      entityCreditUsed[msg.sender] = entityCreditUsed[msg.sender] + strongFee;
    } else {
      uint takeStrong = strongFee * takeStrongBips / 10000;
      require(strongToken.transferFrom(msg.sender, feeCollector, takeStrong), "transfer failed");
      if (strongFee > takeStrong) {
        require(strongToken.transferFrom(msg.sender, address(this), strongFee - takeStrong), "transfer failed");
      }
    }
    sendValue(feeCollector, fee);
    if (msg.value > fee) sendValue(payable(msg.sender), msg.value - fee);
  }
  function claim(uint _nodeId, uint _timestamp, address _toStrongPool) public payable returns (uint) {
    address entity = msg.sender == address(strongNFTBonus) ? tx.origin : msg.sender;
    bytes memory id = getNodeId(entity, _nodeId);
    uint nodeType = entityNodeType[id];
    uint lastClaimedAt = entityNodeLastClaimedAt[id] != 0 ? entityNodeLastClaimedAt[id] : entityNodeCreatedAt[id];
    require(doesNodeExist(entity, _nodeId), "doesnt exist");
    require(!hasNodeExpired(entity, _nodeId), "node expired");
    require(!isNodePastDue(entity, _nodeId), "past due");
    require(_timestamp <= block.timestamp, "bad timestamp");
    require(lastClaimedAt + 900 < _timestamp, "too soon");
    uint reward = getRewardAt(entity, _nodeId, _timestamp);
    require(reward > 0, "no reward");
    require(strongToken.balanceOf(address(this)) >= reward, "over balance");
    uint fee = reward * getClaimingFeeNumerator(nodeType) / getClaimingFeeDenominator(nodeType);
    require(msg.value >= fee, "invalid fee");
    entityNodeLastClaimedAt[id] = _timestamp;
    emit Claimed(entity, _nodeId, reward);
    if (entityCreditUsed[msg.sender] > 0) {
      if (entityCreditUsed[msg.sender] > reward) {
        entityCreditUsed[msg.sender] = entityCreditUsed[msg.sender] - reward;
        reward = 0;
      } else {
        reward = reward - entityCreditUsed[msg.sender];
        entityCreditUsed[msg.sender] = 0;
      }
    }
    if (reward > 0) {
      if (_toStrongPool != address(0)) IStrongPool(_toStrongPool).mineFor(entity, reward);
      else require(strongToken.transfer(entity, reward), "transfer failed");
    }
    sendValue(feeCollector, fee);
    if (isUserCall() && msg.value > fee) sendValue(payable(msg.sender), msg.value - fee);
    return fee;
  }
  function claimAll(uint _timestamp, address _toStrongPool, uint _fromNode, uint _toNode) external payable makesInternalCalls {
    require(entityNodeCount[msg.sender] > 0, "no nodes");
    uint valueLeft = msg.value;
    uint fromNode = _fromNode > 0 ? _fromNode : 1;
    uint toNode = _toNode > 0 ? _toNode : entityNodeCount[msg.sender];
    for (uint nodeId = fromNode; nodeId <= toNode; nodeId++) {
      uint reward = getRewardAt(msg.sender, nodeId, _timestamp);
      if (reward > 0) {
        require(valueLeft > 0, "not enough");
        uint paid = claim(nodeId, _timestamp, _toStrongPool);
        valueLeft = valueLeft - paid;
      }
    }
    if (valueLeft > 0) sendValue(payable(msg.sender), valueLeft);
  }
  function pay(uint _nodeId) public payable returns (uint) {
    bytes memory id = getNodeId(msg.sender, _nodeId);
    uint nodeType = entityNodeType[id];
    uint fee = getRecurringFeeInWei(nodeType);
    require(canNodeBePaid(msg.sender, _nodeId), "cant pay");
    require(msg.value >= fee, "invalid fee");
    entityNodeLastPaidAt[id] = entityNodeLastPaidAt[id] + getRecurringPaymentCycle(nodeType);
    emit Paid(msg.sender, nodeType, _nodeId, entityNodeLastPaidAt[id]);
    sendValue(feeCollector, fee);
    if (isUserCall() && msg.value > fee) sendValue(payable(msg.sender), msg.value - fee);
    return fee;
  }
  function payAll(uint _fromNode, uint _toNode) external payable makesInternalCalls {
    require(entityNodeCount[msg.sender] > 0, "no nodes");
    uint valueLeft = msg.value;
    uint fromNode = _fromNode > 0 ? _fromNode : 1;
    uint toNode = _toNode > 0 ? _toNode : entityNodeCount[msg.sender];
    for (uint nodeId = fromNode; nodeId <= toNode; nodeId++) {
      if (!canNodeBePaid(msg.sender, nodeId)) continue;
      require(valueLeft > 0, "not enough");
      uint paid = pay(nodeId);
      valueLeft = valueLeft - paid;
    }
    if (valueLeft > 0) sendValue(payable(msg.sender), valueLeft);
  }
  function migrateNode(address _entity, uint _nodeType, uint _lastPaidAt) external returns (uint) {
    require(serviceContractEnabled[msg.sender], "no service");
    require(nodeTypeActive[_nodeType], "invalid type");
    uint nodeId = entityNodeCount[_entity] + 1;
    bytes memory id = getNodeId(_entity, nodeId);
    totalNodes = totalNodes + 1;
    entityNodeType[id] = _nodeType;
    entityNodeCreatedAt[id] = _lastPaidAt;
    entityNodeLastPaidAt[id] = _lastPaidAt;
    entityNodeCount[_entity] = entityNodeCount[_entity] + 1;
    entityNodeTypeCount[_entity][_nodeType] = entityNodeTypeCount[_entity][_nodeType] + 1;
    emit MigratedFromService(msg.sender, _entity, _nodeType, nodeId, _lastPaidAt);
    return nodeId;
  }
  //
  // Admin
  // -------------------------------------------------------------------------------------------------------------------
  function deposit(uint _amount) external onlyRole(adminControl.SUPER_ADMIN()) {
    require(_amount > 0);
    require(strongToken.transferFrom(msg.sender, address(this), _amount), "transfer failed");
  }
  function withdraw(address _destination, uint _amount) external onlyRole(adminControl.SUPER_ADMIN()) {
    require(_amount > 0);
    require(strongToken.balanceOf(address(this)) >= _amount, "over balance");
    require(strongToken.transfer(_destination, _amount), "transfer failed");
  }
  function approveStrongPool(IStrongPool _strongPool, uint _amount) external onlyRole(adminControl.SUPER_ADMIN()) {
    require(strongToken.approve(address(_strongPool), _amount), "approve failed");
  }
  function setFeeCollector(address payable _feeCollector) external onlyRole(adminControl.SUPER_ADMIN()) {
    require(_feeCollector != address(0));
    feeCollector = _feeCollector;
    emit SetFeeCollector(_feeCollector);
  }
  function setNFTBonusContract(address _contract) external onlyRole(adminControl.SERVICE_ADMIN()) {
    strongNFTBonus = IStrongNFTBonus(_contract);
    emit SetNFTBonusContract(_contract);
  }
  function setNodesLimit(uint _limit) external onlyRole(adminControl.SERVICE_ADMIN()) {
    nodesLimit = _limit;
    emit SetNodesLimit(_limit);
  }
  function setServiceContractEnabled(address _contract, bool _enabled) external onlyRole(adminControl.SERVICE_ADMIN()) {
    serviceContractEnabled[_contract] = _enabled;
    emit SetServiceContractEnabled(_contract, _enabled);
  }
  function setTakeStrongBips(uint _bips) external onlyRole(adminControl.SUPER_ADMIN()) {
    require(_bips <= 10000, "invalid value");
    takeStrongBips = _bips;
    emit SetTakeStrongBips(_bips);
  }
  function sendValue(address payable recipient, uint256 amount) internal {
    require(address(this).balance >= amount, "insufficient balance");
    // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
    (bool success,) = recipient.call{value : amount}("");
    require(success, "send failed");
  }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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);
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0;
interface IMultiNode {
  function doesNodeExist(address entity, uint nodeId) external view returns (bool);
  function hasNodeExpired(address entity, uint nodeId) external view returns (bool);
  function claim(uint nodeId, uint timestamp, address toStrongPool) external payable returns (uint);
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0;
interface IStrongPool {
  function mineFor(address miner, uint256 amount) external;
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0;
interface IStrongNFTBonus {
  function getBonus(address _entity, uint128 _nodeId, uint256 _from, uint256 _to) external view returns (uint256);
  function getBonusValue(address _entity, uint128 _nodeId, uint256 _from, uint256 _to, uint256 _bonusValue) external view returns (uint256);
  function getStakedNftBonusName(address _entity, uint128 _nodeId, address _serviceContract) external view returns (string memory);
  function migrateNFT(address _entity, uint128 _fromNodeId, uint128 _toNodeId, address _toServiceContract) external;
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0;
import "./Context.sol";
abstract contract InternalCalls is Context {
  uint private constant _NOT_MAKING_INTERNAL_CALLS = 1;
  uint private constant _MAKING_INTERNAL_CALLS = 2;
  uint private _internal_calls_status;
  modifier makesInternalCalls() {
    _internal_calls_status = _MAKING_INTERNAL_CALLS;
    _;
    _internal_calls_status = _NOT_MAKING_INTERNAL_CALLS;
  }
  function init() internal {
    _internal_calls_status = _NOT_MAKING_INTERNAL_CALLS;
  }
  function isInternalCall() internal view returns (bool) {
    return _internal_calls_status == _MAKING_INTERNAL_CALLS;
  }
  function isContractCall() internal view returns (bool) {
    return _msgSender() != tx.origin;
  }
  function isUserCall() internal view returns (bool) {
    return !isInternalCall() && !isContractCall();
  }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0;
import "./AdminAccess.sol";
contract MultiNodeSettings is AdminAccess {
  uint constant public NODE_TYPE_REWARD_BASE_RATE = 0;
  uint constant public NODE_TYPE_REWARD_DECAY_FACTOR = 1;
  uint constant public NODE_TYPE_FEE_STRONG = 2;
  uint constant public NODE_TYPE_FEE_CREATE = 3;
  uint constant public NODE_TYPE_FEE_RECURRING = 4;
  uint constant public NODE_TYPE_FEE_CLAIMING_NUMERATOR = 5;
  uint constant public NODE_TYPE_FEE_CLAIMING_DENOMINATOR = 6;
  uint constant public NODE_TYPE_RECURRING_CYCLE_SECONDS = 7;
  uint constant public NODE_TYPE_GRACE_PERIOD_SECONDS = 8;
  uint constant public NODE_TYPE_PAY_CYCLES_LIMIT = 9;
  uint constant public NODE_TYPE_NODES_LIMIT = 10;
  mapping(uint => bool) public nodeTypeActive;
  mapping(uint => bool) public nodeTypeHasSettings;
  mapping(uint => mapping(uint => uint)) public nodeTypeSettings;
  mapping(uint => mapping(string => uint)) public nodeTypeNFTBonus;
  // Events
  event SetNodeTypeActive(uint nodeType, bool active);
  event SetNodeTypeSetting(uint nodeType, uint settingId, uint value);
  event SetNodeTypeHasSettings(uint nodeType, bool hasSettings);
  event SetNodeTypeNFTBonus(uint nodeType, string bonusName, uint value);
  //
  // Getters
  // -------------------------------------------------------------------------------------------------------------------
  function getRewardBaseRate(uint _nodeType) public view returns (uint) {
    return getCustomSettingOrDefaultIfZero(_nodeType, NODE_TYPE_REWARD_BASE_RATE);
  }
  function getRewardDecayFactor(uint _nodeType) public view returns (uint) {
    return getCustomSettingOrDefaultIfZero(_nodeType, NODE_TYPE_REWARD_DECAY_FACTOR);
  }
  function getClaimingFeeNumerator(uint _nodeType) public view returns (uint) {
    return getCustomSettingOrDefaultIfZero(_nodeType, NODE_TYPE_FEE_CLAIMING_NUMERATOR);
  }
  function getClaimingFeeDenominator(uint _nodeType) public view returns (uint) {
    return getCustomSettingOrDefaultIfZero(_nodeType, NODE_TYPE_FEE_CLAIMING_DENOMINATOR);
  }
  function getCreatingFeeInWei(uint _nodeType) public view returns (uint) {
    return getCustomSettingOrDefaultIfZero(_nodeType, NODE_TYPE_FEE_CREATE);
  }
  function getRecurringFeeInWei(uint _nodeType) public view returns (uint) {
    return getCustomSettingOrDefaultIfZero(_nodeType, NODE_TYPE_FEE_RECURRING);
  }
  function getStrongFeeInWei(uint _nodeType) public view returns (uint) {
    return getCustomSettingOrDefaultIfZero(_nodeType, NODE_TYPE_FEE_STRONG);
  }
  function getRecurringPaymentCycle(uint _nodeType) public view returns (uint) {
    return getCustomSettingOrDefaultIfZero(_nodeType, NODE_TYPE_RECURRING_CYCLE_SECONDS);
  }
  function getGracePeriod(uint _nodeType) public view returns (uint) {
    return getCustomSettingOrDefaultIfZero(_nodeType, NODE_TYPE_GRACE_PERIOD_SECONDS);
  }
  function getPayCyclesLimit(uint _nodeType) public view returns (uint) {
    return getCustomSettingOrDefaultIfZero(_nodeType, NODE_TYPE_PAY_CYCLES_LIMIT);
  }
  function getNodesLimit(uint _nodeType) public view returns (uint) {
    return getCustomSettingOrDefaultIfZero(_nodeType, NODE_TYPE_NODES_LIMIT);
  }
  function getNftBonusValue(uint _nodeType, string memory _bonusName) public view returns (uint) {
    return nodeTypeNFTBonus[_nodeType][_bonusName] > 0
    ? nodeTypeNFTBonus[_nodeType][_bonusName]
    : nodeTypeNFTBonus[0][_bonusName];
  }
  //
  // Setters
  // -------------------------------------------------------------------------------------------------------------------
  function setNodeTypeActive(uint _nodeType, bool _active) external onlyRole(adminControl.SERVICE_ADMIN()) {
    // Node type 0 is being used as a placeholder for the default settings for node types that don't have custom ones,
    // So it shouldn't be activated and used to create nodes
    require(_nodeType > 0, "invalid type");
    nodeTypeActive[_nodeType] = _active;
    emit SetNodeTypeActive(_nodeType, _active);
  }
  function setNodeTypeHasSettings(uint _nodeType, bool _hasSettings) external onlyRole(adminControl.SERVICE_ADMIN()) {
    nodeTypeHasSettings[_nodeType] = _hasSettings;
    emit SetNodeTypeHasSettings(_nodeType, _hasSettings);
  }
  function setNodeTypeSetting(uint _nodeType, uint _settingId, uint _value) external onlyRole(adminControl.SERVICE_ADMIN()) {
    nodeTypeHasSettings[_nodeType] = true;
    nodeTypeSettings[_nodeType][_settingId] = _value;
    emit SetNodeTypeSetting(_nodeType, _settingId, _value);
  }
  function setNodeTypeNFTBonus(uint _nodeType, string memory _bonusName, uint _value) external onlyRole(adminControl.SERVICE_ADMIN()) {
    nodeTypeNFTBonus[_nodeType][_bonusName] = _value;
    emit SetNodeTypeNFTBonus(_nodeType, _bonusName, _value);
  }
  // -------------------------------------------------------------------------------------------------------------------
  function getCustomSettingOrDefaultIfZero(uint _nodeType, uint _setting) internal view returns (uint) {
    return nodeTypeHasSettings[_nodeType] && nodeTypeSettings[_nodeType][_setting] > 0
    ? nodeTypeSettings[_nodeType][_setting]
    : nodeTypeSettings[0][_setting];
  }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0;
library SbMath {
  uint internal constant DECIMAL_PRECISION = 1e18;
  /*
  * Multiply two decimal numbers and use normal rounding rules:
  * -round product up if 19'th mantissa digit >= 5
  * -round product down if 19'th mantissa digit < 5
  *
  * Used only inside the exponentiation, _decPow().
  */
  function decMul(uint x, uint y) internal pure returns (uint decProd) {
    uint prod_xy = x * y;
    decProd = (prod_xy + (DECIMAL_PRECISION / 2)) / DECIMAL_PRECISION;
  }
  /*
  * _decPow: Exponentiation function for 18-digit decimal base, and integer exponent n.
  *
  * Uses the efficient "exponentiation by squaring" algorithm. O(log(n)) complexity.
  *
  * The exponent is capped to avoid reverting due to overflow. The cap 525600000 equals
  * "minutes in 1000 years": 60 * 24 * 365 * 1000
  */
  function _decPow(uint _base, uint _minutes) internal pure returns (uint) {
    if (_minutes > 525_600_000) _minutes = 525_600_000;  // cap to avoid overflow
    if (_minutes == 0) return DECIMAL_PRECISION;
    uint y = DECIMAL_PRECISION;
    uint x = _base;
    uint n = _minutes;
    // Exponentiation-by-squaring
    while (n > 1) {
      if (n % 2 == 0) {
        x = decMul(x, x);
        n = n / 2;
      } else { // if (n % 2 != 0)
        y = decMul(x, y);
        x = decMul(x, x);
        n = (n - 1) / 2;
      }
    }
    return decMul(x, y);
  }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0;
/*
 * @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 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) {
        return 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;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0;
import "../interfaces/IAdminControl.sol";
abstract contract AdminAccess {
  IAdminControl public adminControl;
  modifier onlyRole(uint8 _role) {
    require(address(adminControl) == address(0) || adminControl.hasRole(_role, msg.sender), "no access");
    _;
  }
  function addAdminControlContract(IAdminControl _contract) external onlyRole(0) {
    adminControl = _contract;
  }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0;
interface IAdminControl {
  function hasRole(uint8 _role, address _account) external view returns (bool);
  function SUPER_ADMIN() external view returns (uint8);
  function ADMIN() external view returns (uint8);
  function SERVICE_ADMIN() external view returns (uint8);
}