Contract Source Code:

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

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(account),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * May emit a {RoleGranted} event.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

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

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @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 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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @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
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

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

pragma solidity ^0.8.0;

import "./math/Math.sol";
import "./math/SignedMath.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import "../interfaces/ILosslessERC20.sol";
import "../interfaces/ILosslessController.sol";

contract LERC20 is Context, ILERC20 {
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    uint256 private _totalSupply;
    string private _name;
    string private _symbol;

    address public recoveryAdmin;
    address private recoveryAdminCandidate;
    bytes32 private recoveryAdminKeyHash;
    address override public admin;
    uint256 public timelockPeriod;
    uint256 public losslessTurnOffTimestamp;
    bool public isLosslessOn = true;
    ILssController public lossless;

    constructor(string memory name_, string memory symbol_, address admin_, address recoveryAdmin_, uint256 timelockPeriod_, address lossless_) {
        require(recoveryAdmin_ != address(0), "LERC20: Recovery admin cannot be zero address");
        require(admin_ != address(0), "LERC20: Recovery admin cannot be zero address");
        _name = name_;
        _symbol = symbol_;
        admin = admin_;
        recoveryAdmin = recoveryAdmin_;
        recoveryAdminCandidate = address(0);
        recoveryAdminKeyHash = "";
        require(timelockPeriod_ > 2 hours, "LERC20: Timelock period must be greater than 0");
        require(timelockPeriod_ < 2 days, "LERC20: Timelock period must be less than 2 days");
        // Note: should not be changed after deployment, due to potential security risk in case of loss of owner private key
        timelockPeriod = timelockPeriod_;
        losslessTurnOffTimestamp = 0;
        require(lossless_ != address(0), "LERC20: Lossless cannot be zero address");
        lossless = ILssController(lossless_);
    }

    // --- LOSSLESS modifiers ---
    modifier lssAprove(address spender, uint256 amount) {
        if (isLosslessOn) {
            lossless.beforeApprove(_msgSender(), spender, amount);
        } 
        _;
    }

    modifier lssTransfer(address recipient, uint256 amount) {
        if (isLosslessOn) {
            lossless.beforeTransfer(_msgSender(), recipient, amount);
        } 
        _;
    }

    modifier lssTransferFrom(address sender, address recipient, uint256 amount) {
        if (isLosslessOn) {
            lossless.beforeTransferFrom(_msgSender(),sender, recipient, amount);
        }
        _;
    }

    modifier lssIncreaseAllowance(address spender, uint256 addedValue) {
        if (isLosslessOn) {
            lossless.beforeIncreaseAllowance(_msgSender(), spender, addedValue);
        }
        _;
    }

    modifier lssDecreaseAllowance(address spender, uint256 subtractedValue) {
        if (isLosslessOn) {
            lossless.beforeDecreaseAllowance(_msgSender(), spender, subtractedValue);
        }
        _;
    }

    modifier onlyRecoveryAdmin() {
        require(_msgSender() == recoveryAdmin, "LERC20: Must be recovery admin");
        _;
    }

    // --- LOSSLESS management ---
    function transferOutBlacklistedFunds(address[] calldata from) override external {
        require(_msgSender() == address(lossless), "LERC20: Only lossless contract");
        require(isLosslessOn, "LERC20: Lossless is off");

        uint256 fromLength = from.length;
        uint256 totalAmount = 0;
        
        for (uint256 i = 0; i < fromLength; i++) {
            address fromAddress = from[i];
            uint256 fromBalance = _balances[fromAddress];
            _balances[fromAddress] = 0;
            totalAmount += fromBalance;
            emit Transfer(fromAddress, address(lossless), fromBalance);
        }

        _balances[address(lossless)] += totalAmount;
    }

    function setLosslessAdmin(address newAdmin) override external onlyRecoveryAdmin {
        require(newAdmin != admin, "LERC20: Cannot set same address");
        emit NewAdmin(newAdmin);
        admin = newAdmin;
    }

    function transferRecoveryAdminOwnership(address candidate, bytes32 keyHash) override  external onlyRecoveryAdmin {
        require(candidate != address(0), "LERC20: Candidate cannot be zero address");
        recoveryAdminCandidate = candidate;
        recoveryAdminKeyHash = keyHash;
        emit NewRecoveryAdminProposal(candidate);
    }

    function acceptRecoveryAdminOwnership(bytes memory key) override external {
        require(_msgSender() == recoveryAdminCandidate, "LERC20: Must be canditate");
        require(keccak256(key) == recoveryAdminKeyHash, "LERC20: Invalid key");
        emit NewRecoveryAdmin(recoveryAdminCandidate);
        require(recoveryAdminCandidate != address(0), "LERC20: Candidate cannot be zero address");
        recoveryAdmin = recoveryAdminCandidate;
        recoveryAdminCandidate = address(0);
        recoveryAdminKeyHash = "";
    }

    function proposeLosslessTurnOff() override external onlyRecoveryAdmin {
        require(losslessTurnOffTimestamp == 0, "LERC20: TurnOff already proposed");
        require(isLosslessOn, "LERC20: Lossless already off");
        losslessTurnOffTimestamp = block.timestamp + timelockPeriod;
        emit LosslessTurnOffProposal(losslessTurnOffTimestamp);
    }

    function executeLosslessTurnOff() override external onlyRecoveryAdmin {
        require(losslessTurnOffTimestamp != 0, "ERC20: TurnOff not proposed");
        require(losslessTurnOffTimestamp <= block.timestamp, "ERC20: Time lock in progress");
        isLosslessOn = false;
        losslessTurnOffTimestamp = 0;
        emit LosslessOff();
    }

    function executeLosslessTurnOn() override external onlyRecoveryAdmin {
        require(!isLosslessOn, "LERC20: Lossless already on");
        losslessTurnOffTimestamp = 0;
        isLosslessOn = true;
        emit LosslessOn();
    }

    function getAdmin() override public view virtual returns (address) {
        return admin;
    }

    // --- ERC20 methods ---

    function name() override public view virtual returns (string memory) {
        return _name;
    }

    function symbol() override public view virtual returns (string memory) {
        return _symbol;
    }

    function decimals() override public view virtual returns (uint8) {
        return 18;
    }

    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount) public virtual override lssTransfer(recipient, amount) returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public virtual override lssAprove(spender, amount) returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public virtual override lssTransferFrom(sender, recipient, amount) returns (bool) {
        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        _transfer(sender, recipient, amount);
        
        _approve(sender, _msgSender(), currentAllowance - amount);

        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) override public virtual lssIncreaseAllowance(spender, addedValue) returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) override public virtual lssDecreaseAllowance(spender, subtractedValue) returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        _approve(_msgSender(), spender, currentAllowance - subtractedValue);

        return true;
    }

    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        _balances[sender] = senderBalance - amount;
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);
    }

    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");
    
        _totalSupply += amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked { 
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);
    }

    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

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

    function _approve(address owner, address spender, uint256 amount) internal virtual {
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return interfaceId == type(IERC20).interfaceId || interfaceId == type(ILERC20).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./ILosslessERC20.sol";
import "./ILosslessGovernance.sol";
import "./ILosslessStaking.sol";
import "./ILosslessReporting.sol";
import "./IProtectionStrategy.sol";

interface ILssController {
    // function getLockedAmount(ILERC20 _token, address _account)  returns (uint256);
    // function getAvailableAmount(ILERC20 _token, address _account) external view returns (uint256 amount);
    function retrieveBlacklistedFunds(address[] calldata _addresses, ILERC20 _token, uint256 _reportId) external returns(uint256);
    function whitelist(address _adr) external view returns (bool);
    function dexList(address _dexAddress) external returns (bool);
    function blacklist(address _adr) external view returns (bool);
    function admin() external view returns (address);
    function pauseAdmin() external view returns (address);
    function recoveryAdmin() external view returns (address);
    function guardian() external view returns (address);
    function losslessStaking() external view returns (ILssStaking);
    function losslessReporting() external view returns (ILssReporting);
    function losslessGovernance() external view returns (ILssGovernance);
    function dexTranferThreshold() external view returns (uint256);
    function settlementTimeLock() external view returns (uint256);
    function extraordinaryRetrievalProposalPeriod() external view returns (uint256);
    
    function pause() external;
    function unpause() external;
    function setAdmin(address _newAdmin) external;
    function setRecoveryAdmin(address _newRecoveryAdmin) external;
    function setPauseAdmin(address _newPauseAdmin) external;
    function setSettlementTimeLock(uint256 _newTimelock) external;
    function setDexTransferThreshold(uint256 _newThreshold) external;
    function setDexList(address[] calldata _dexList, bool _value) external;
    function setWhitelist(address[] calldata _addrList, bool _value) external;
    function addToBlacklist(address _adr) external;
    function resolvedNegatively(address _adr) external;
    function setStakingContractAddress(ILssStaking _adr) external;
    function setReportingContractAddress(ILssReporting _adr) external; 
    function setGovernanceContractAddress(ILssGovernance _adr) external;
    function setTokenMintLimit(ILERC20 _token, uint256 limit) external;
    function setTokenMintPeriod(ILERC20 _token, uint256 _period) external;
    function setTokenBurnLimit(ILERC20 _token, uint256 _limit) external;
    function setTokenBurnPeriod(ILERC20 _token, uint256 _period) external;
    function proposeNewSettlementPeriod(ILERC20 _token, uint256 _seconds) external;
    function executeNewSettlementPeriod(ILERC20 _token) external;
    function activateEmergency(ILERC20 _token) external;
    function deactivateEmergency(ILERC20 _token) external;
    function setGuardian(address _newGuardian) external;
    function removeProtectedAddress(ILERC20 _token, address _protectedAddresss) external;
    function beforeTransfer(address _sender, address _recipient, uint256 _amount) external;
    function beforeTransferFrom(address _msgSender, address _sender, address _recipient, uint256 _amount) external;
    function beforeApprove(address _sender, address _spender, uint256 _amount) external;
    function beforeIncreaseAllowance(address _msgSender, address _spender, uint256 _addedValue) external;
    function beforeDecreaseAllowance(address _msgSender, address _spender, uint256 _subtractedValue) external;
    function beforeMint(address _to, uint256 _amount) external;
    function beforeBurn(address _account, uint256 _amount) external;
    function afterTransfer(address _sender, address _recipient, uint256 _amount) external;
    function setProtectedAddress(ILERC20 _token, address _protectedAddress, ProtectionStrategy _strategy) external;
    function setExtraordinaryRetrievalPeriod(uint256 _newPEriod) external;
    function extraordinaryRetrieval(ILERC20 _token, address[] calldata addresses, uint256 fundsToRetrieve) external;

    event AdminChange(address indexed _newAdmin);
    event RecoveryAdminChange(address indexed _newAdmin);
    event PauseAdminChange(address indexed _newAdmin);
    event GuardianSet(address indexed _oldGuardian, address indexed _newGuardian);
    event NewProtectedAddress(ILERC20 indexed _token, address indexed _protectedAddress, address indexed _strategy);
    event RemovedProtectedAddress(ILERC20 indexed _token, address indexed _protectedAddress);
    event NewSettlementPeriodProposal(ILERC20 indexed _token, uint256 _seconds);
    event SettlementPeriodChange(ILERC20 indexed _token, uint256 _proposedTokenLockTimeframe);
    event NewSettlementTimelock(uint256 indexed _timelock);
    event NewDexThreshold(uint256 indexed _newThreshold);
    event NewDex(address indexed _dexAddress);
    event DexRemoval(address indexed _dexAddress);
    event NewWhitelistedAddress(address indexed _whitelistAdr);
    event WhitelistedAddressRemoval(address indexed _whitelistAdr);
    event NewBlacklistedAddress(address indexed _blacklistedAddres);
    event AccountBlacklistRemoval(address indexed _adr);
    event NewStakingContract(ILssStaking indexed _newAdr);
    event NewReportingContract(ILssReporting indexed _newAdr);
    event NewGovernanceContract(ILssGovernance indexed _newAdr);
    event EmergencyActive(ILERC20 indexed _token);
    event EmergencyDeactivation(ILERC20 indexed _token);
    event NewMint(ILERC20 indexed token, address indexed account, uint256 indexed amount);
    event NewMintLimit(ILERC20 indexed token, uint256 indexed limit);
    event NewMintPeriod(ILERC20 indexed token, uint256 indexed period);
    event NewBurn(ILERC20 indexed token, address indexed account, uint256 indexed amount);
    event NewBurnLimit(ILERC20 indexed token, uint256 indexed limit);
    event NewBurnPeriod(ILERC20 indexed token, uint256 indexed period);
    event NewExtraordinaryPeriod(uint256 indexed extraordinaryRetrievalProposalPeriod);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface ILERC20 {
    function name() external view returns (string memory);
    function admin() external view returns (address);
    function getAdmin() external view returns (address);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address _account) external view returns (uint256);
    function transfer(address _recipient, uint256 _amount) external returns (bool);
    function allowance(address _owner, address _spender) external view returns (uint256);
    function approve(address _spender, uint256 _amount) external returns (bool);
    function transferFrom(address _sender, address _recipient, uint256 _amount) external returns (bool);
    function increaseAllowance(address _spender, uint256 _addedValue) external returns (bool);
    function decreaseAllowance(address _spender, uint256 _subtractedValue) external returns (bool);
    
    function transferOutBlacklistedFunds(address[] calldata _from) external;
    function setLosslessAdmin(address _newAdmin) external;
    function transferRecoveryAdminOwnership(address _candidate, bytes32 _keyHash) external;
    function acceptRecoveryAdminOwnership(bytes memory _key) external;
    function proposeLosslessTurnOff() external;
    function executeLosslessTurnOff() external;
    function executeLosslessTurnOn() external;

    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
    event NewAdmin(address indexed _newAdmin);
    event NewRecoveryAdminProposal(address indexed _candidate);
    event NewRecoveryAdmin(address indexed _newAdmin);
    event LosslessTurnOffProposal(uint256 _turnOffDate);
    event LosslessOff();
    event LosslessOn();
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./ILosslessERC20.sol";
import "./ILosslessStaking.sol";
import "./ILosslessReporting.sol";
import "./ILosslessController.sol";

interface ILssGovernance {
    function LSS_TEAM_INDEX() external view returns(uint256);
    function TOKEN_OWNER_INDEX() external view returns(uint256);
    function COMMITEE_INDEX() external view returns(uint256);
    function committeeMembersCount() external view returns(uint256);
    function walletDisputePeriod() external view returns(uint256);
    function losslessStaking() external view returns (ILssStaking);
    function losslessReporting() external view returns (ILssReporting);
    function losslessController() external view returns (ILssController);
    function isCommitteeMember(address _account) external view returns(bool);
    function getIsVoted(uint256 _reportId, uint256 _voterIndex) external view returns(bool);
    function getVote(uint256 _reportId, uint256 _voterIndex) external view returns(bool);
    function isReportSolved(uint256 _reportId) external view returns(bool);
    function reportResolution(uint256 _reportId) external view returns(bool);
    function getAmountReported(uint256 _reportId) external view returns(uint256);
    
    function setDisputePeriod(uint256 _timeFrame) external;
    function addCommitteeMembers(address[] memory _members) external;
    function removeCommitteeMembers(address[] memory _members) external;
    function losslessVote(uint256 _reportId, bool _vote) external;
    function tokenOwnersVote(uint256 _reportId, bool _vote) external;
    function committeeMemberVote(uint256 _reportId, bool _vote) external;
    function resolveReport(uint256 _reportId) external;
    function proposeWallet(uint256 _reportId, address wallet) external;
    function rejectWallet(uint256 _reportId) external;
    function retrieveFunds(uint256 _reportId) external;
    function retrieveCompensation() external;
    function claimCommitteeReward(uint256 _reportId) external;
    function setCompensationAmount(uint256 _amount) external;
    function losslessClaim(uint256 _reportId) external;
    function extaordinaryRetrieval(address[] calldata _address, ILERC20 _token) external;

    event NewCommitteeMembers(address[] _members);
    event CommitteeMembersRemoval(address[] _members);
    event LosslessTeamPositiveVote(uint256 indexed _reportId);
    event LosslessTeamNegativeVote(uint256 indexed _reportId);
    event TokenOwnersPositiveVote(uint256 indexed _reportId);
    event TokenOwnersNegativeVote(uint256 indexed _reportId);
    event CommitteeMemberPositiveVote(uint256 indexed _reportId, address indexed _member);
    event CommitteeMemberNegativeVote(uint256 indexed _reportId, address indexed _member);
    event ReportResolve(uint256 indexed _reportId, bool indexed _resolution);
    event WalletProposal(uint256 indexed _reportId, address indexed _wallet);
    event CommitteeMemberClaim(uint256 indexed _reportId, address indexed _member, uint256 indexed _amount);
    event CommitteeMajorityReach(uint256 indexed _reportId, bool indexed _result);
    event NewDisputePeriod(uint256 indexed _newPeriod);
    event WalletRejection(uint256 indexed _reportId);
    event FundsRetrieval(uint256 indexed _reportId, uint256 indexed _amount);
    event CompensationRetrieval(address indexed _wallet, uint256 indexed _amount);
    event LosslessClaim(ILERC20 indexed _token, uint256 indexed _reportID, uint256 indexed _amount);
    event ExtraordinaryProposalAccept(ILERC20 indexed _token);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./ILosslessERC20.sol";
import "./ILosslessGovernance.sol";
import "./ILosslessStaking.sol";
import "./ILosslessController.sol";

interface ILssReporting {
  function reporterReward() external returns(uint256);
  function losslessReward() external returns(uint256);
  function stakersReward() external returns(uint256);
  function committeeReward() external returns(uint256);
  function reportLifetime() external view returns(uint256);
  function reportingAmount() external returns(uint256);
  function reportCount() external returns(uint256);
  function stakingToken() external returns(ILERC20);
  function losslessController() external returns(ILssController);
  function losslessGovernance() external returns(ILssGovernance);
  function getVersion() external pure returns (uint256);
  function getRewards() external view returns (uint256 _reporter, uint256 _lossless, uint256 _committee, uint256 _stakers);
  function report(ILERC20 _token, address _account) external returns (uint256);
  function reporterClaimableAmount(uint256 _reportId) external view returns (uint256);
  function getReportInfo(uint256 _reportId) external view returns(address _reporter,
        address _reportedAddress,
        address _secondReportedAddress,
        uint256 _reportTimestamps,
        ILERC20 _reportTokens,
        bool _secondReports,
        bool _reporterClaimStatus);
  
  function pause() external;
  function unpause() external;
  function setStakingToken(ILERC20 _stakingToken) external;
  function setLosslessGovernance(ILssGovernance _losslessGovernance) external;
  function setReportingAmount(uint256 _reportingAmount) external;
  function setReporterReward(uint256 _reward) external;
  function setLosslessReward(uint256 _reward) external;
  function setStakersReward(uint256 _reward) external;
  function setCommitteeReward(uint256 _reward) external;
  function setReportLifetime(uint256 _lifetime) external;
  function secondReport(uint256 _reportId, address _account) external;
  function reporterClaim(uint256 _reportId) external;
  function retrieveCompensation(address _adr, uint256 _amount) external;

  event ReportSubmission(ILERC20 indexed _token, address indexed _account, uint256 indexed _reportId);
  event SecondReportSubmission(ILERC20 indexed _token, address indexed _account, uint256 indexed _reportId);
  event NewReportingAmount(uint256 indexed _newAmount);
  event NewStakingToken(ILERC20 indexed _token);
  event NewGovernanceContract(ILssGovernance indexed _adr);
  event NewReporterReward(uint256 indexed _newValue);
  event NewLosslessReward(uint256 indexed _newValue);
  event NewStakersReward(uint256 indexed _newValue);
  event NewCommitteeReward(uint256 indexed _newValue);
  event NewReportLifetime(uint256 indexed _newValue);
  event ReporterClaim(address indexed _reporter, uint256 indexed _reportId, uint256 indexed _amount);
  event CompensationRetrieve(address indexed _adr, uint256 indexed _amount);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./ILosslessERC20.sol";
import "./ILosslessGovernance.sol";
import "./ILosslessReporting.sol";
import "./ILosslessController.sol";

interface ILssStaking {
  function stakingToken() external returns(ILERC20);
  function losslessReporting() external returns(ILssReporting);
  function losslessController() external returns(ILssController);
  function losslessGovernance() external returns(ILssGovernance);
  function stakingAmount() external returns(uint256);
  function getVersion() external pure returns (uint256);
  function getIsAccountStaked(uint256 _reportId, address _account) external view returns(bool);
  function getStakerCoefficient(uint256 _reportId, address _address) external view returns (uint256);
  function stakerClaimableAmount(uint256 _reportId) external view returns (uint256);
  function reportCoefficient(uint256 _reportId) external view returns (uint256);
  
  function pause() external;
  function unpause() external;
  function setLssReporting(ILssReporting _losslessReporting) external;
  function setStakingToken(ILERC20 _stakingToken) external;
  function setLosslessGovernance(ILssGovernance _losslessGovernance) external;
  function setStakingAmount(uint256 _stakingAmount) external;
  function stake(uint256 _reportId) external;
  function stakerClaim(uint256 _reportId) external;

  event NewStake(ILERC20 indexed _token, address indexed _account, uint256 indexed _reportId);
  event StakerClaim(address indexed _staker, ILERC20 indexed _token, uint256 indexed _reportID, uint256 _amount);
  event NewStakingAmount(uint256 indexed _newAmount);
  event NewStakingToken(ILERC20 indexed _newToken);
  event NewReportingContract(ILssReporting indexed _newContract);
  event NewGovernanceContract(ILssGovernance indexed _newContract);
}

pragma solidity ^0.8.0;

interface ProtectionStrategy {
    function isTransferAllowed(address token, address sender, address recipient, uint256 amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./core/LERC20.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";

contract SKRBridged is Context, LERC20, AccessControl {
    constructor(
      address admin_, 
      address recoveryAdmin_, 
      uint256 timelockPeriod_, 
      address lossless_,
      address minter_
    ) LERC20(
      "Saakuru", 
      "SKR", 
      admin_, 
      recoveryAdmin_, 
      timelockPeriod_, 
      lossless_
    ) {
        require(minter_ != address(0), "SKRBridged: initial owner is the zero address");
        _grantRole(DEFAULT_ADMIN_ROLE, admin_);
        _grantRole(keccak256("MINTER_ROLE"), minter_);
    }

    modifier lssBurn(address account, uint256 amount) {
        if (isLosslessOn) {
            lossless.beforeBurn(account, amount);
        } 
        _;
    }

    function burn(uint256 amount) public virtual lssBurn(_msgSender(), amount) {
        _burn(_msgSender(), amount);
    }

    function burnFrom(address account, uint256 amount) public virtual lssBurn(account, amount) {
        uint256 currentAllowance = allowance(account, _msgSender());
        require(currentAllowance >= amount, "ERC20: burn amount exceeds allowance");
        unchecked {
            _approve(account, _msgSender(), currentAllowance - amount);
        }
        _burn(account, amount);
    }

    function mint(address to, uint256 amount) public onlyRole(keccak256("MINTER_ROLE")) {
        _mint(to, amount);
    }

    function supportsInterface(bytes4 interfaceId) 
        public 
        view virtual 
        override(AccessControl, LERC20)
        returns (bool) {
        return super.supportsInterface(interfaceId);
    }
}