CapitalPool

{{
  "language": "Solidity",
  "sources": {
    "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol": {
      "content": "// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../GSN/ContextUpgradeable.sol";
import "../proxy/Initializable.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 OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal initializer {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal initializer {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view 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;
    }
    uint256[49] private __gap;
}
"
    },
    "@openzeppelin/contracts-upgradeable/GSN/ContextUpgradeable.sol": {
      "content": "// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;
import "../proxy/Initializable.sol";

/*
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal initializer {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal initializer {
    }
    function _msgSender() internal view virtual returns (address payable) {
        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;
    }
    uint256[50] private __gap;
}
"
    },
    "@openzeppelin/contracts-upgradeable/proxy/Initializable.sol": {
      "content": "// SPDX-License-Identifier: MIT

// solhint-disable-next-line compiler-version
pragma solidity >=0.4.24 <0.8.0;


/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 * 
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}.
 * 
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract contract Initializable {

    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || _isConstructor() || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /// @dev Returns true if and only if the function is running in the constructor
    function _isConstructor() private view returns (bool) {
        // extcodesize checks the size of the code stored in an address, and
        // address returns the current address. Since the code is still not
        // deployed when running a constructor, any checks on its code size will
        // yield zero, making it an effective way to detect if a contract is
        // under construction or not.
        address self = address(this);
        uint256 cs;
        // solhint-disable-next-line no-inline-assembly
        assembly { cs := extcodesize(self) }
        return cs == 0;
    }
}
"
    },
    "@openzeppelin/contracts/GSN/Context.sol": {
      "content": "// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/*
 * @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 payable) {
        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;
    }
}
"
    },
    "@openzeppelin/contracts/math/Math.sol": {
      "content": "// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @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, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}
"
    },
    "@openzeppelin/contracts/math/SafeMath.sol": {
      "content": "// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}
"
    },
    "@openzeppelin/contracts/token/ERC20/ERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "../../GSN/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol) {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    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");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}
"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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);
}
"
    },
    "@openzeppelin/contracts/token/ERC20/SafeERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
"
    },
    "@openzeppelin/contracts/utils/Address.sol": {
      "content": "// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @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");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        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);
            }
        }
    }
}
"
    },
    "contracts/abstract/AbstractDependant.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.7.4;

import "../interfaces/IContractsRegistry.sol";

abstract contract AbstractDependant {
    /// @dev keccak256(AbstractDependant.setInjector(address)) - 1
    bytes32 private constant _INJECTOR_SLOT =
        0xd6b8f2e074594ceb05d47c27386969754b6ad0c15e5eb8f691399cd0be980e76;

    modifier onlyInjectorOrZero() {
        address _injector = injector();

        require(_injector == address(0) || _injector == msg.sender, "Dependant: Not an injector");
        _;
    }

    function setInjector(address _injector) external onlyInjectorOrZero {
        bytes32 slot = _INJECTOR_SLOT;

        assembly {
            sstore(slot, _injector)
        }
    }

    /// @dev has to apply onlyInjectorOrZero() modifier
    function setDependencies(IContractsRegistry) external virtual;

    function injector() public view returns (address _injector) {
        bytes32 slot = _INJECTOR_SLOT;

        assembly {
            _injector := sload(slot)
        }
    }
}
"
    },
    "contracts/CapitalPool.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.7.4;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/math/Math.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

import "./libraries/DecimalsConverter.sol";

import "./interfaces/ICapitalPool.sol";
import "./interfaces/IClaimingRegistry.sol";
import "./interfaces/IContractsRegistry.sol";
import "./interfaces/ILeveragePortfolio.sol";
import "./interfaces/ILiquidityRegistry.sol";
import "./interfaces/IPolicyBook.sol";
import "./interfaces/IPolicyBookRegistry.sol";
import "./interfaces/IYieldGenerator.sol";
import "./interfaces/ILeveragePortfolioView.sol";

import "./abstract/AbstractDependant.sol";

import "./Globals.sol";

contract CapitalPool is ICapitalPool, OwnableUpgradeable, AbstractDependant {
    using SafeERC20 for ERC20;
    using SafeMath for uint256;
    using Math for uint256;

    uint256 public constant ADDITIONAL_WITHDRAW_PERIOD = 1 days;

    IClaimingRegistry public claimingRegistry;
    IPolicyBookRegistry public policyBookRegistry;
    IYieldGenerator public yieldGenerator;
    ILeveragePortfolio public reinsurancePool;
    ILiquidityRegistry public liquidityRegistry;
    ILeveragePortfolioView public leveragePortfolioView;
    ERC20 public stblToken;

    // reisnurance pool vStable balance updated by(premium, interest from defi)
    uint256 public reinsurancePoolBalance;
    // user leverage pool vStable balance updated by(premium, addliq, withdraw liq)
    mapping(address => uint256) public leveragePoolBalance;
    // policy books vStable balances updated by(premium, addliq, withdraw liq)
    mapping(address => uint256) public regularCoverageBalance;
    // all hStable capital balance , updated by (all pool transfer + deposit to dfi + liq cushion)
    uint256 public hardUsdtAccumulatedBalance;
    // all vStable capital balance , updated by (all pool transfer + withdraw from liq cushion)
    uint256 public override virtualUsdtAccumulatedBalance;
    // pool balances tracking
    uint256 public override liquidityCushionBalance;
    address public maintainer;

    uint256 public stblDecimals;

    // new state post v2 deployemnt
    bool public isLiqCushionPaused;
    bool public automaticHardRebalancing;

    uint256 public override rebalanceDuration;
    bool private deployFundsToDefi;

    event PoolBalancesUpdated(
        uint256 hardUsdtAccumulatedBalance,
        uint256 virtualUsdtAccumulatedBalance,
        uint256 liquidityCushionBalance,
        uint256 reinsurancePoolBalance
    );

    event LiquidityCushionRebalanced(
        uint256 liquidityNeede,
        uint256 liquidityWithdraw,
        uint256 liquidityDeposit
    );

    modifier broadcastBalancing() {
        _;
        emit PoolBalancesUpdated(
            hardUsdtAccumulatedBalance,
            virtualUsdtAccumulatedBalance,
            liquidityCushionBalance,
            reinsurancePoolBalance
        );
    }

    modifier onlyPolicyBook() {
        require(policyBookRegistry.isPolicyBook(msg.sender), "CAPL: Not a PolicyBook");
        _;
    }

    modifier onlyReinsurancePool() {
        require(
            address(reinsurancePool) == _msgSender(),
            "RP: Caller is not a reinsurance pool contract"
        );
        _;
    }

    modifier onlyClaimingRegistry() {
        require(
            address(claimingRegistry) == _msgSender(),
            "CP: Caller is not claiming registry contract"
        );
        _;
    }

    modifier onlyMaintainer() {
        require(_msgSender() == maintainer, "CP: not maintainer");
        _;
    }

    modifier onlyYieldGenerator() {
        require(_msgSender() == address(yieldGenerator), "CP: not yield generator");
        _;
    }

    function __CapitalPool_init() external initializer {
        __Ownable_init();
        maintainer = _msgSender();
        rebalanceDuration = 3 days;
        deployFundsToDefi = true;
    }

    function setDependencies(IContractsRegistry _contractsRegistry)
        external
        override
        onlyInjectorOrZero
    {
        claimingRegistry = IClaimingRegistry(_contractsRegistry.getClaimingRegistryContract());
        policyBookRegistry = IPolicyBookRegistry(
            _contractsRegistry.getPolicyBookRegistryContract()
        );
        stblToken = ERC20(_contractsRegistry.getUSDTContract());
        yieldGenerator = IYieldGenerator(_contractsRegistry.getYieldGeneratorContract());
        reinsurancePool = ILeveragePortfolio(_contractsRegistry.getReinsurancePoolContract());
        liquidityRegistry = ILiquidityRegistry(_contractsRegistry.getLiquidityRegistryContract());
        leveragePortfolioView = ILeveragePortfolioView(
            _contractsRegistry.getLeveragePortfolioViewContract()
        );
        stblDecimals = stblToken.decimals();
    }

    /// @notice distributes the policybook premiums into pools (CP, ULP , RP)
    /// @dev distributes the balances acording to the established percentages
    /// @param _stblAmount amount hardSTBL ingressed into the system
    /// @param _epochsNumber uint256 the number of epochs which the policy holder will pay a premium for
    /// @param _protocolFee uint256 the amount of protocol fee earned by premium
    function addPolicyHoldersHardSTBL(
        uint256 _stblAmount,
        uint256 _epochsNumber,
        uint256 _protocolFee
    ) external override onlyPolicyBook broadcastBalancing returns (uint256) {
        PremiumFactors memory factors;

        factors.vStblOfCP = regularCoverageBalance[_msgSender()];
        factors.premiumPrice = _stblAmount.sub(_protocolFee);

        factors.policyBookFacade = IPolicyBookFacade(IPolicyBook(_msgSender()).policyBookFacade());

        factors.vStblDeployedByRP = DecimalsConverter.convertFrom18(
            factors.policyBookFacade.VUreinsurnacePool(),
            stblDecimals
        );

        factors.userLeveragePoolsCount = factors.policyBookFacade.countUserLeveragePools();
        factors.epochsNumber = _epochsNumber;

        uint256 reinsurancePoolPremium;
        uint256 coveragePoolPremium;

        if (factors.vStblDeployedByRP == 0 && factors.userLeveragePoolsCount == 0) {
            coveragePoolPremium = factors.premiumPrice;
        } else {
            (reinsurancePoolPremium, coveragePoolPremium) = _calcPremiumForAllPools(factors);
        }

        uint256 reinsurancePoolTotalPremium = reinsurancePoolPremium.add(_protocolFee);
        reinsurancePoolBalance = reinsurancePoolBalance.add(reinsurancePoolTotalPremium);
        reinsurancePool.addPolicyPremium(
            _epochsNumber,
            DecimalsConverter.convertTo18(reinsurancePoolTotalPremium, stblDecimals)
        );

        regularCoverageBalance[_msgSender()] = regularCoverageBalance[_msgSender()].add(
            coveragePoolPremium
        );
        hardUsdtAccumulatedBalance = hardUsdtAccumulatedBalance.add(_stblAmount);
        virtualUsdtAccumulatedBalance = virtualUsdtAccumulatedBalance.add(_stblAmount);
        return DecimalsConverter.convertTo18(coveragePoolPremium, stblDecimals);
    }

    function _calcPremiumForAllPools(PremiumFactors memory factors)
        internal
        returns (uint256 reinsurancePoolPremium, uint256 coveragePoolPremium)
    {
        uint256 _totalCoverTokens =
            DecimalsConverter.convertFrom18(
                (IPolicyBook(_msgSender())).totalCoverTokens(),
                stblDecimals
            );

        factors.poolUtilizationRation = _totalCoverTokens.mul(PERCENTAGE_100).div(
            factors.vStblOfCP
        );

        uint256 _participatedLeverageAmounts;

        if (factors.userLeveragePoolsCount > 0) {
            address[] memory _userLeverageArr =
                factors.policyBookFacade.listUserLeveragePools(0, factors.userLeveragePoolsCount);

            for (uint256 i = 0; i < _userLeverageArr.length; i++) {
                _participatedLeverageAmounts = _participatedLeverageAmounts.add(
                    clacParticipatedLeverageAmount(factors, _userLeverageArr[i])
                );
            }
        }
        uint256 totalLiqforPremium =
            factors.vStblOfCP.add(factors.vStblDeployedByRP).add(_participatedLeverageAmounts);

        factors.premiumPerDeployment = (factors.premiumPrice.mul(PRECISION)).div(
            totalLiqforPremium
        );

        reinsurancePoolPremium = _calcReinsurancePoolPremium(factors);

        if (factors.userLeveragePoolsCount > 0) {
            _calcUserLeveragePoolPremium(factors);
        }
        coveragePoolPremium = _calcCoveragePoolPremium(factors);
    }

    /// @notice distributes the hardSTBL from the coverage providers
    /// @dev emits PoolBalancedUpdated event
    /// @param _stblAmount amount hardSTBL ingressed into the system
    function addCoverageProvidersHardSTBL(uint256 _stblAmount)
        external
        override
        onlyPolicyBook
        broadcastBalancing
    {
        regularCoverageBalance[_msgSender()] = regularCoverageBalance[_msgSender()].add(
            _stblAmount
        );
        hardUsdtAccumulatedBalance = hardUsdtAccumulatedBalance.add(_stblAmount);
        virtualUsdtAccumulatedBalance = virtualUsdtAccumulatedBalance.add(_stblAmount);
    }

    //// @notice distributes the hardSTBL from the leverage providers
    /// @dev emits PoolBalancedUpdated event
    /// @param _stblAmount amount hardSTBL ingressed into the system
    function addLeverageProvidersHardSTBL(uint256 _stblAmount)
        external
        override
        onlyPolicyBook
        broadcastBalancing
    {
        leveragePoolBalance[_msgSender()] = leveragePoolBalance[_msgSender()].add(_stblAmount);
        hardUsdtAccumulatedBalance = hardUsdtAccumulatedBalance.add(_stblAmount);
        virtualUsdtAccumulatedBalance = virtualUsdtAccumulatedBalance.add(_stblAmount);
    }

    /// @notice distributes the hardSTBL from the reinsurance pool
    /// @dev emits PoolBalancedUpdated event
    /// @param _stblAmount amount hardSTBL ingressed into the system
    function addReinsurancePoolHardSTBL(uint256 _stblAmount)
        external
        override
        onlyReinsurancePool
        broadcastBalancing
    {
        reinsurancePoolBalance = reinsurancePoolBalance.add(_stblAmount);
        hardUsdtAccumulatedBalance = hardUsdtAccumulatedBalance.add(_stblAmount);
        virtualUsdtAccumulatedBalance = virtualUsdtAccumulatedBalance.add(_stblAmount);
    }

    /// @notice rebalances pools acording to v2 specification and dao enforced policies
    /// @dev  emits PoolBalancesUpdated
    function rebalanceLiquidityCushion() public override broadcastBalancing onlyMaintainer {
        require(!isLiqCushionPaused, "CP: liqudity cushion is pasued");

        //check defi protocol balances
        (, uint256 _lostAmount) = yieldGenerator.reevaluateDefiProtocolBalances();

        if (_lostAmount > 0) {
            isLiqCushionPaused = true;
            if (automaticHardRebalancing) {
                defiHardRebalancing();
            }
        }

        // hard rebalancing - Stop all withdrawals from all pools
        if (isLiqCushionPaused) {
            hardUsdtAccumulatedBalance = hardUsdtAccumulatedBalance.add(liquidityCushionBalance);
            liquidityCushionBalance = 0;
            return;
        }

        uint256 _pendingClaimAmount =
            claimingRegistry.getAllPendingClaimsAmount(
                claimingRegistry.getWithdrawClaimRequestIndexListCount()
            );
        uint256 _pendingRewardAmount =
            claimingRegistry.getAllPendingRewardsAmount(
                claimingRegistry.getWithdrawRewardRequestVoterListCount()
            );

        uint256 _pendingWithdrawlAmount =
            liquidityRegistry.getAllPendingWithdrawalRequestsAmount(
                liquidityRegistry.getWithdrawlRequestUsersListCount()
            );

        uint256 _requiredLiquidity =
            _pendingWithdrawlAmount.add(_pendingClaimAmount).add(_pendingRewardAmount);

        _requiredLiquidity = DecimalsConverter.convertFrom18(_requiredLiquidity, stblDecimals);

        (uint256 _deposit, uint256 _withdraw) = getDepositAndWithdraw(_requiredLiquidity);

        liquidityCushionBalance = _requiredLiquidity;

        hardUsdtAccumulatedBalance = 0;

        uint256 _actualAmount;
        if (_deposit > 0) {
            stblToken.safeApprove(address(yieldGenerator), 0);
            stblToken.safeApprove(address(yieldGenerator), _deposit);

            _actualAmount = yieldGenerator.deposit(_deposit);
            if (_actualAmount < _deposit) {
                hardUsdtAccumulatedBalance = hardUsdtAccumulatedBalance.add(
                    (_deposit.sub(_actualAmount))
                );
            }
        } else if (_withdraw > 0) {
            _actualAmount = yieldGenerator.withdraw(_withdraw);
            if (_actualAmount < _withdraw) {
                liquidityCushionBalance = liquidityCushionBalance.sub(
                    (_withdraw.sub(_actualAmount))
                );
            }
        }

        emit LiquidityCushionRebalanced(_requiredLiquidity, _withdraw, _deposit);
    }

    /// @param _rebalanceDuration parameter passes in seconds
    function setRebalanceDuration(uint256 _rebalanceDuration) public onlyOwner {
        require(_rebalanceDuration <= 7 days, "CP: invalid rebalance duration");
        rebalanceDuration = _rebalanceDuration;
    }

    function defiHardRebalancing() public onlyOwner {
        (uint256 _totalDeposit, uint256 _lostAmount) =
            yieldGenerator.reevaluateDefiProtocolBalances();

        if (_lostAmount > 0 && _totalDeposit > _lostAmount) {
            uint256 _lostPercentage =
                _lostAmount.mul(PERCENTAGE_100).div(virtualUsdtAccumulatedBalance);

            address[] memory _policyBooksArr =
                policyBookRegistry.list(0, policyBookRegistry.count());
            ///@dev we should update all coverage pools liquidity before leverage pool
            /// in order to do leverage rebalancing for all pools at once
            for (uint256 i = 0; i < _policyBooksArr.length; i++) {
                if (policyBookRegistry.isUserLeveragePool(_policyBooksArr[i])) continue;

                _updatePoolLiquidity(_policyBooksArr[i], 0, _lostPercentage, PoolType.COVERAGE);
            }

            address[] memory _userLeverageArr =
                policyBookRegistry.listByType(
                    IPolicyBookFabric.ContractType.VARIOUS,
                    0,
                    policyBookRegistry.countByType(IPolicyBookFabric.ContractType.VARIOUS)
                );

            for (uint256 i = 0; i < _userLeverageArr.length; i++) {
                _updatePoolLiquidity(_userLeverageArr[i], 0, _lostPercentage, PoolType.LEVERAGE);
            }
            yieldGenerator.defiHardRebalancing();
        }
    }

    /// @dev when calling this function we have to have either _lostAmount == 0 or _lostPercentage == 0
    function _updatePoolLiquidity(
        address _poolAddress,
        uint256 _lostAmount,
        uint256 _lostPercentage,
        PoolType poolType
    ) internal {
        IPolicyBook _pool = IPolicyBook(_poolAddress);

        if (_lostPercentage > 0) {
            uint256 _currentLiquidity = _pool.totalLiquidity();
            _lostAmount = _currentLiquidity.mul(_lostPercentage).div(PERCENTAGE_100);
        }
        _pool.updateLiquidity(_lostAmount);

        uint256 _stblLostAmount = DecimalsConverter.convertFrom18(_lostAmount, stblDecimals);

        if (poolType == PoolType.COVERAGE) {
            regularCoverageBalance[_poolAddress] = regularCoverageBalance[_poolAddress].sub(
                _stblLostAmount
            );
        } else if (poolType == PoolType.LEVERAGE) {
            leveragePoolBalance[_poolAddress] = leveragePoolBalance[_poolAddress].sub(
                _stblLostAmount
            );
        } else if (poolType == PoolType.REINSURANCE) {
            reinsurancePoolBalance = reinsurancePoolBalance.sub(_stblLostAmount);
        }

        if (_lostPercentage > 0) {
            virtualUsdtAccumulatedBalance = virtualUsdtAccumulatedBalance.sub(_stblLostAmount);
        }
    }

    /// @notice Fullfils policybook claims by transfering the balance to claimer
    /// @param _claimer, address of the claimer recieving the withdraw
    /// @param _stblClaimAmount uint256 amount to of the claim
    function fundClaim(
        address _claimer,
        uint256 _stblClaimAmount,
        address _policyBookAddress
    ) external override onlyClaimingRegistry returns (uint256 _actualAmount) {
        _actualAmount = _withdrawFromLiquidityCushion(_claimer, _stblClaimAmount);

        _dispatchLiquidities(
            _policyBookAddress,
            DecimalsConverter.convertTo18(_actualAmount, stblDecimals)
        );
    }

    function _dispatchLiquidities(address _policyBookAddress, uint256 _claimAmount) internal {
        IPolicyBook policyBook = IPolicyBook(_policyBookAddress);
        IPolicyBookFacade policyBookFacade = policyBook.policyBookFacade();

        uint256 totalCoveragedLiquidity = policyBook.totalLiquidity();
        uint256 totalLeveragedLiquidity = policyBookFacade.totalLeveragedLiquidity();
        uint256 totalPoolLiquidity = totalCoveragedLiquidity.add(totalLeveragedLiquidity);

        // COVERAGE CONTRIBUTION
        uint256 coverageContribution =
            totalCoveragedLiquidity.mul(PERCENTAGE_100).div(totalPoolLiquidity);
        uint256 coverageLoss = _claimAmount.mul(coverageContribution).div(PERCENTAGE_100);
        _updatePoolLiquidity(_policyBookAddress, coverageLoss, 0, PoolType.COVERAGE);

        // LEVERAGE CONTRIBUTION
        address[] memory _userLeverageArr =
            policyBookFacade.listUserLeveragePools(0, policyBookFacade.countUserLeveragePools());
        for (uint256 i = 0; i < _userLeverageArr.length; i++) {
            uint256 leverageContribution =
                policyBookFacade.LUuserLeveragePool(_userLeverageArr[i]).mul(PERCENTAGE_100).div(
                    totalPoolLiquidity
                );
            uint256 leverageLoss = _claimAmount.mul(leverageContribution).div(PERCENTAGE_100);
            _updatePoolLiquidity(_userLeverageArr[i], leverageLoss, 0, PoolType.LEVERAGE);
        }

        // REINSURANCE CONTRIBUTION
        uint256 reinsuranceContribution =
            (policyBookFacade.LUreinsurnacePool().add(policyBookFacade.VUreinsurnacePool()))
                .mul(PERCENTAGE_100)
                .div(totalPoolLiquidity);
        uint256 reinsuranceLoss = _claimAmount.mul(reinsuranceContribution).div(PERCENTAGE_100);
        _updatePoolLiquidity(address(reinsurancePool), reinsuranceLoss, 0, PoolType.REINSURANCE);
    }

    /// @notice Fullfils policybook claims by transfering the balance to claimer
    /// @param _voter, address of the voter recieving the withdraw
    /// @param _stblRewardAmount uint256 amount to of the reward
    function fundReward(address _voter, uint256 _stblRewardAmount)
        external
        override
        onlyClaimingRegistry
        returns (uint256 _actualAmount)
    {
        _actualAmount = _withdrawFromLiquidityCushion(_voter, _stblRewardAmount);

        _updatePoolLiquidity(
            address(reinsurancePool),
            DecimalsConverter.convertTo18(_actualAmount, stblDecimals),
            0,
            PoolType.REINSURANCE
        );
    }

    /// @notice add instant withdawal amount from defi protocol (withdraw all fund) to the hardSTBL
    /// @param _stblAmount amount hardSTBL returned to the system
    /// @param _accumaltedAmount amount hardstable of defi interest returned to the dein treasury
    function addWithdrawalHardSTBL(uint256 _stblAmount, uint256 _accumaltedAmount)
        external
        override
        onlyYieldGenerator
        broadcastBalancing
    {
        if (hardUsdtAccumulatedBalance == 0) {
            // previous balance hold in the contract
            hardUsdtAccumulatedBalance = 543676;
        }
        // only add to hardUsdtAccumulatedBalance as this balance already added to virtual balance
        hardUsdtAccumulatedBalance = hardUsdtAccumulatedBalance.add(_stblAmount);

        if (_accumaltedAmount != 0) {
            // send defi interest to treasury
            address _receiver = 0x505E6D4a723c956c36f022BBcDC103c2b3D6025F;
            stblToken.safeTransfer(_receiver, _accumaltedAmount);
        }
    }

    /// @notice Withdraws liquidity from a specific policbybook to the user
    /// @param _sender, address of the user beneficiary of the withdraw
    /// @param _stblAmount uint256 amount to be withdrawn
    function withdrawLiquidity(
        address _sender,
        uint256 _stblAmount,
        bool _isLeveragePool
    ) external override onlyPolicyBook broadcastBalancing returns (uint256 _actualAmount) {
        _actualAmount = _withdrawFromLiquidityCushion(_sender, _stblAmount);

        if (_isLeveragePool) {
            leveragePoolBalance[_msgSender()] = leveragePoolBalance[_msgSender()].sub(
                _actualAmount
            );
        } else {
            regularCoverageBalance[_msgSender()] = regularCoverageBalance[_msgSender()].sub(
                _actualAmount
            );
        }
    }

    function batchWithdrawLiquidity(address[] calldata _policyBookList) external {
        require(_policyBookList.length != 0 , "CP: invalid policy book list");
        require(_policyBookList.length <= 10, "CP: too many policy books");
        uint256 _totalAmount;

        for (uint256 i = 0; i < _policyBookList.length; i++) { 
            require(policyBookRegistry.isPolicyBook(_policyBookList[i]),"cp: invalid policy book");
            require(IERC20(_policyBookList[i]).balanceOf(msg.sender) != 0, "CP: insufficient liquidity");
            _totalAmount = _totalAmount.add(IPolicyBook(_policyBookList[i]).removeLiquidity(msg.sender));
        }
        _totalAmount =   DecimalsConverter.convertFrom18(_totalAmount, stblDecimals);
        require(hardUsdtAccumulatedBalance >= _totalAmount, "CP: insuficient liquidity");
        hardUsdtAccumulatedBalance = hardUsdtAccumulatedBalance.sub(_totalAmount);
        virtualUsdtAccumulatedBalance = virtualUsdtAccumulatedBalance.sub(_totalAmount);

        stblToken.safeTransfer(
            msg.sender,
           _totalAmount
        );
    }

    function setMaintainer(address _newMainteiner) public onlyOwner {
        require(_newMainteiner != address(0), "CP: invalid maintainer address");
        maintainer = _newMainteiner;
    }

    function pauseLiquidityCushionRebalancing(bool _paused) public onlyOwner {
        require(_paused != isLiqCushionPaused, "CP: invalid paused state");

        isLiqCushionPaused = _paused;

        if (isLiqCushionPaused) {
            hardUsdtAccumulatedBalance = hardUsdtAccumulatedBalance.add(liquidityCushionBalance);
            liquidityCushionBalance = 0;
        }
    }

    function automateHardRebalancing(bool _isAutomatic) public onlyOwner {
        require(_isAutomatic != automaticHardRebalancing, "CP: invalid state");

        automaticHardRebalancing = _isAutomatic;
    }

    function allowDeployFundsToDefi(bool _deployFundsToDefi) public onlyOwner {
        require(_deployFundsToDefi != deployFundsToDefi, "CP: invalid input");

        //can not disabled deploy funds to defi in case there is deposited amount
        if (!_deployFundsToDefi) {
            require(yieldGenerator.totalDeposit() == 0, "CP: Can't disable deploy funds");
        }

        deployFundsToDefi = _deployFundsToDefi;

        // check isLiqCushionPaused isn't have the same state before update it
        if (isLiqCushionPaused != !deployFundsToDefi) {
            pauseLiquidityCushionRebalancing(!deployFundsToDefi);
        }
    }

    function _withdrawFromLiquidityCushion(address _sender, uint256 _stblAmount)
        internal
        broadcastBalancing
        returns (uint256 _actualAmount)
    {
        //withdraw from hardbalance if defi deployment is pasued
        //if (!deployFundsToDefi) {
        require(hardUsdtAccumulatedBalance >= _stblAmount, "CP: insuficient liquidity");
        hardUsdtAccumulatedBalance = hardUsdtAccumulatedBalance.sub(_stblAmount);
        _actualAmount = _stblAmount;
        // } else {
        //     //withdraw from liq cushion service if defi deployment is enabled
        //     require(!isLiqCushionPaused, "CP: withdraw is pasued");

        //     if (_stblAmount > liquidityCushionBalance) {
        //         uint256 _diffAmount = _stblAmount.sub(liquidityCushionBalance);
        //         if (hardUsdtAccumulatedBalance >= _diffAmount) {
        //             hardUsdtAccumulatedBalance = hardUsdtAccumulatedBalance.sub(_diffAmount);
        //             liquidityCushionBalance = liquidityCushionBalance.add(_diffAmount);
        //         } else if (hardUsdtAccumulatedBalance > 0) {
        //             liquidityCushionBalance = liquidityCushionBalance.add(
        //                 hardUsdtAccumu