// File: @daostack/infra/contracts/votingMachines/IntVoteInterface.sol

pragma solidity ^0.5.4;

interface IntVoteInterface {
    //When implementing this interface please do not only override function and modifier,
    //but also to keep the modifiers on the overridden functions.
    modifier onlyProposalOwner(bytes32 _proposalId) {revert(); _;}
    modifier votable(bytes32 _proposalId) {revert(); _;}

    event NewProposal(
        bytes32 indexed _proposalId,
        address indexed _organization,
        uint256 _numOfChoices,
        address _proposer,
        bytes32 _paramsHash
    );

    event ExecuteProposal(bytes32 indexed _proposalId,
        address indexed _organization,
        uint256 _decision,
        uint256 _totalReputation
    );

    event VoteProposal(
        bytes32 indexed _proposalId,
        address indexed _organization,
        address indexed _voter,
        uint256 _vote,
        uint256 _reputation
    );

    event CancelProposal(bytes32 indexed _proposalId, address indexed _organization );
    event CancelVoting(bytes32 indexed _proposalId, address indexed _organization, address indexed _voter);

    /**
     * @dev register a new proposal with the given parameters. Every proposal has a unique ID which is being
     * generated by calculating keccak256 of a incremented counter.
     * @param _numOfChoices number of voting choices
     * @param _proposalParameters defines the parameters of the voting machine used for this proposal
     * @param _proposer address
     * @param _organization address - if this address is zero the msg.sender will be used as the organization address.
     * @return proposal's id.
     */
    function propose(
        uint256 _numOfChoices,
        bytes32 _proposalParameters,
        address _proposer,
        address _organization
        ) external returns(bytes32);

    function vote(
        bytes32 _proposalId,
        uint256 _vote,
        uint256 _rep,
        address _voter
    )
    external
    returns(bool);

    function cancelVote(bytes32 _proposalId) external;

    function getNumberOfChoices(bytes32 _proposalId) external view returns(uint256);

    function isVotable(bytes32 _proposalId) external view returns(bool);

    /**
     * @dev voteStatus returns the reputation voted for a proposal for a specific voting choice.
     * @param _proposalId the ID of the proposal
     * @param _choice the index in the
     * @return voted reputation for the given choice
     */
    function voteStatus(bytes32 _proposalId, uint256 _choice) external view returns(uint256);

    /**
     * @dev isAbstainAllow returns if the voting machine allow abstain (0)
     * @return bool true or false
     */
    function isAbstainAllow() external pure returns(bool);

    /**
     * @dev getAllowedRangeOfChoices returns the allowed range of choices for a voting machine.
     * @return min - minimum number of choices
               max - maximum number of choices
     */
    function getAllowedRangeOfChoices() external pure returns(uint256 min, uint256 max);
}

// File: openzeppelin-solidity/contracts/token/ERC20/IERC20.sol

pragma solidity ^0.5.0;

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
interface IERC20 {
    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: @daostack/infra/contracts/votingMachines/VotingMachineCallbacksInterface.sol

pragma solidity ^0.5.4;


interface VotingMachineCallbacksInterface {
    function mintReputation(uint256 _amount, address _beneficiary, bytes32 _proposalId) external returns(bool);
    function burnReputation(uint256 _amount, address _owner, bytes32 _proposalId) external returns(bool);

    function stakingTokenTransfer(IERC20 _stakingToken, address _beneficiary, uint256 _amount, bytes32 _proposalId)
    external
    returns(bool);

    function getTotalReputationSupply(bytes32 _proposalId) external view returns(uint256);
    function reputationOf(address _owner, bytes32 _proposalId) external view returns(uint256);
    function balanceOfStakingToken(IERC20 _stakingToken, bytes32 _proposalId) external view returns(uint256);
}

// File: openzeppelin-solidity/contracts/ownership/Ownable.sol

pragma solidity ^0.5.0;

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    constructor () internal {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @return the address of the owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner());
        _;
    }

    /**
     * @return true if `msg.sender` is the owner of the contract.
     */
    function isOwner() public view returns (bool) {
        return msg.sender == _owner;
    }

    /**
     * @dev Allows the current owner to relinquish control of the contract.
     * @notice Renouncing to ownership will leave the contract without an owner.
     * It will not be possible to call the functions with the `onlyOwner`
     * modifier anymore.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Allows the current owner to transfer control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0));
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: @daostack/infra/contracts/Reputation.sol

pragma solidity ^0.5.4;



/**
 * @title Reputation system
 * @dev A DAO has Reputation System which allows peers to rate other peers in order to build trust .
 * A reputation is use to assign influence measure to a DAO'S peers.
 * Reputation is similar to regular tokens but with one crucial difference: It is non-transferable.
 * The Reputation contract maintain a map of address to reputation value.
 * It provides an onlyOwner functions to mint and burn reputation _to (or _from) a specific address.
 */

contract Reputation is Ownable {

    uint8 public decimals = 18;             //Number of decimals of the smallest unit
    // Event indicating minting of reputation to an address.
    event Mint(address indexed _to, uint256 _amount);
    // Event indicating burning of reputation for an address.
    event Burn(address indexed _from, uint256 _amount);

      /// @dev `Checkpoint` is the structure that attaches a block number to a
      ///  given value, the block number attached is the one that last changed the
      ///  value
    struct Checkpoint {

    // `fromBlock` is the block number that the value was generated from
        uint128 fromBlock;

          // `value` is the amount of reputation at a specific block number
        uint128 value;
    }

      // `balances` is the map that tracks the balance of each address, in this
      //  contract when the balance changes the block number that the change
      //  occurred is also included in the map
    mapping (address => Checkpoint[]) balances;

      // Tracks the history of the `totalSupply` of the reputation
    Checkpoint[] totalSupplyHistory;

    /// @notice Constructor to create a Reputation
    constructor(
    ) public
    {
    }

    /// @dev This function makes it easy to get the total number of reputation
    /// @return The total number of reputation
    function totalSupply() public view returns (uint256) {
        return totalSupplyAt(block.number);
    }

  ////////////////
  // Query balance and totalSupply in History
  ////////////////
    /**
    * @dev return the reputation amount of a given owner
    * @param _owner an address of the owner which we want to get his reputation
    */
    function balanceOf(address _owner) public view returns (uint256 balance) {
        return balanceOfAt(_owner, block.number);
    }

      /// @dev Queries the balance of `_owner` at a specific `_blockNumber`
      /// @param _owner The address from which the balance will be retrieved
      /// @param _blockNumber The block number when the balance is queried
      /// @return The balance at `_blockNumber`
    function balanceOfAt(address _owner, uint256 _blockNumber)
    public view returns (uint256)
    {
        if ((balances[_owner].length == 0) || (balances[_owner][0].fromBlock > _blockNumber)) {
            return 0;
          // This will return the expected balance during normal situations
        } else {
            return getValueAt(balances[_owner], _blockNumber);
        }
    }

      /// @notice Total amount of reputation at a specific `_blockNumber`.
      /// @param _blockNumber The block number when the totalSupply is queried
      /// @return The total amount of reputation at `_blockNumber`
    function totalSupplyAt(uint256 _blockNumber) public view returns(uint256) {
        if ((totalSupplyHistory.length == 0) || (totalSupplyHistory[0].fromBlock > _blockNumber)) {
            return 0;
          // This will return the expected totalSupply during normal situations
        } else {
            return getValueAt(totalSupplyHistory, _blockNumber);
        }
    }

      /// @notice Generates `_amount` reputation that are assigned to `_owner`
      /// @param _user The address that will be assigned the new reputation
      /// @param _amount The quantity of reputation generated
      /// @return True if the reputation are generated correctly
    function mint(address _user, uint256 _amount) public onlyOwner returns (bool) {
        uint256 curTotalSupply = totalSupply();
        require(curTotalSupply + _amount >= curTotalSupply); // Check for overflow
        uint256 previousBalanceTo = balanceOf(_user);
        require(previousBalanceTo + _amount >= previousBalanceTo); // Check for overflow
        updateValueAtNow(totalSupplyHistory, curTotalSupply + _amount);
        updateValueAtNow(balances[_user], previousBalanceTo + _amount);
        emit Mint(_user, _amount);
        return true;
    }

      /// @notice Burns `_amount` reputation from `_owner`
      /// @param _user The address that will lose the reputation
      /// @param _amount The quantity of reputation to burn
      /// @return True if the reputation are burned correctly
    function burn(address _user, uint256 _amount) public onlyOwner returns (bool) {
        uint256 curTotalSupply = totalSupply();
        uint256 amountBurned = _amount;
        uint256 previousBalanceFrom = balanceOf(_user);
        if (previousBalanceFrom < amountBurned) {
            amountBurned = previousBalanceFrom;
        }
        updateValueAtNow(totalSupplyHistory, curTotalSupply - amountBurned);
        updateValueAtNow(balances[_user], previousBalanceFrom - amountBurned);
        emit Burn(_user, amountBurned);
        return true;
    }

  ////////////////
  // Internal helper functions to query and set a value in a snapshot array
  ////////////////

      /// @dev `getValueAt` retrieves the number of reputation at a given block number
      /// @param checkpoints The history of values being queried
      /// @param _block The block number to retrieve the value at
      /// @return The number of reputation being queried
    function getValueAt(Checkpoint[] storage checkpoints, uint256 _block) internal view returns (uint256) {
        if (checkpoints.length == 0) {
            return 0;
        }

          // Shortcut for the actual value
        if (_block >= checkpoints[checkpoints.length-1].fromBlock) {
            return checkpoints[checkpoints.length-1].value;
        }
        if (_block < checkpoints[0].fromBlock) {
            return 0;
        }

          // Binary search of the value in the array
        uint256 min = 0;
        uint256 max = checkpoints.length-1;
        while (max > min) {
            uint256 mid = (max + min + 1) / 2;
            if (checkpoints[mid].fromBlock<=_block) {
                min = mid;
            } else {
                max = mid-1;
            }
        }
        return checkpoints[min].value;
    }

      /// @dev `updateValueAtNow` used to update the `balances` map and the
      ///  `totalSupplyHistory`
      /// @param checkpoints The history of data being updated
      /// @param _value The new number of reputation
    function updateValueAtNow(Checkpoint[] storage checkpoints, uint256 _value) internal {
        require(uint128(_value) == _value); //check value is in the 128 bits bounderies
        if ((checkpoints.length == 0) || (checkpoints[checkpoints.length - 1].fromBlock < block.number)) {
            Checkpoint storage newCheckPoint = checkpoints[checkpoints.length++];
            newCheckPoint.fromBlock = uint128(block.number);
            newCheckPoint.value = uint128(_value);
        } else {
            Checkpoint storage oldCheckPoint = checkpoints[checkpoints.length-1];
            oldCheckPoint.value = uint128(_value);
        }
    }
}

// File: ../../openzeppelin-solidity/contracts/math/SafeMath.sol

pragma solidity ^0.5.0;

/**
 * @title SafeMath
 * @dev Unsigned math operations with safety checks that revert on error
 */
library SafeMath {
    /**
    * @dev Multiplies two unsigned integers, 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 unsigned integers truncating the quotient, reverts on division by zero.
    */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 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 unsigned integers, 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 unsigned integers, 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 unsigned integers 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: ../../openzeppelin-solidity/contracts/token/ERC20/ERC20.sol

pragma solidity ^0.5.0;



/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
 * Originally based on code by FirstBlood:
 * https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 *
 * This implementation emits additional Approval events, allowing applications to reconstruct the allowance status for
 * all accounts just by listening to said events. Note that this isn't required by the specification, and other
 * compliant implementations may not do it.
 */
contract ERC20 is IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowed;

    uint256 private _totalSupply;

    /**
    * @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 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 returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    /**
     * @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 Transfer tokens from one address to another.
     * Note that while this function emits an Approval event, this is not required as per the specification,
     * and other compliant implementations may not emit the event.
     * @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 returns (bool) {
        _allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);
        _transfer(from, to, value);
        emit Approval(from, msg.sender, _allowed[from][msg.sender]);
        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
     * Emits an Approval event.
     * @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
     * Emits an Approval event.
     * @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 Transfer token for a specified addresses
    * @param from The address to transfer from.
    * @param to The address to transfer to.
    * @param value The amount to be transferred.
    */
    function _transfer(address from, address to, uint256 value) internal {
        require(to != address(0));

        _balances[from] = _balances[from].sub(value);
        _balances[to] = _balances[to].add(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 value The amount that will be created.
     */
    function _mint(address account, uint256 value) internal {
        require(account != address(0));

        _totalSupply = _totalSupply.add(value);
        _balances[account] = _balances[account].add(value);
        emit Transfer(address(0), account, value);
    }

    /**
     * @dev Internal function that burns an amount of the token of a given
     * account.
     * @param account The account whose tokens will be burnt.
     * @param value The amount that will be burnt.
     */
    function _burn(address account, uint256 value) internal {
        require(account != address(0));

        _totalSupply = _totalSupply.sub(value);
        _balances[account] = _balances[account].sub(value);
        emit Transfer(account, address(0), value);
    }

    /**
     * @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.
     * Emits an Approval event (reflecting the reduced allowance).
     * @param account The account whose tokens will be burnt.
     * @param value The amount that will be burnt.
     */
    function _burnFrom(address account, uint256 value) internal {
        _allowed[account][msg.sender] = _allowed[account][msg.sender].sub(value);
        _burn(account, value);
        emit Approval(account, msg.sender, _allowed[account][msg.sender]);
    }
}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20Burnable.sol

pragma solidity ^0.5.0;


/**
 * @title Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
contract ERC20Burnable is ERC20 {
    /**
     * @dev Burns a specific amount of tokens.
     * @param value The amount of token to be burned.
     */
    function burn(uint256 value) public {
        _burn(msg.sender, value);
    }

    /**
     * @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 {
        _burnFrom(from, value);
    }
}

// File: contracts/controller/DAOToken.sol

pragma solidity ^0.5.4;





/**
 * @title DAOToken, base on zeppelin contract.
 * @dev ERC20 compatible token. It is a mintable, burnable token.
 */

contract DAOToken is ERC20, ERC20Burnable, Ownable {

    string public name;
    string public symbol;
    // solhint-disable-next-line const-name-snakecase
    uint8 public constant decimals = 18;
    uint256 public cap;

    /**
    * @dev Constructor
    * @param _name - token name
    * @param _symbol - token symbol
    * @param _cap - token cap - 0 value means no cap
    */
    constructor(string memory _name, string memory _symbol, uint256 _cap)
    public {
        name = _name;
        symbol = _symbol;
        cap = _cap;
    }

    /**
     * @dev Function to mint tokens
     * @param _to The address that will receive the minted tokens.
     * @param _amount The amount of tokens to mint.
     */
    function mint(address _to, uint256 _amount) public onlyOwner returns (bool) {
        if (cap > 0)
            require(totalSupply().add(_amount) <= cap);
        _mint(_to, _amount);
        return true;
    }
}

// File: openzeppelin-solidity/contracts/utils/Address.sol

pragma solidity ^0.5.0;

/**
 * Utility library of inline functions on addresses
 */
library Address {
    /**
     * Returns whether the target address is a contract
     * @dev This function will return false if invoked during the constructor of a contract,
     * as the code is not actually created until after the constructor finishes.
     * @param account address of the account to check
     * @return whether the target address is a contract
     */
    function isContract(address account) internal view returns (bool) {
        uint256 size;
        // XXX Currently there is no better way to check if there is a contract in an address
        // than to check the size of the code at that address.
        // See https://ethereum.stackexchange.com/a/14016/36603
        // for more details about how this works.
        // TODO Check this again before the Serenity release, because all addresses will be
        // contracts then.
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
}

// File: contracts/libs/SafeERC20.sol

/*

SafeERC20 by daostack.
The code is based on a fix by SECBIT Team.

USE WITH CAUTION & NO WARRANTY

REFERENCE & RELATED READING
- https://github.com/ethereum/solidity/issues/4116
- https://medium.com/@chris_77367/explaining-unexpected-reverts-starting-with-solidity-0-4-22-3ada6e82308c
- https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca
- https://gist.github.com/BrendanChou/88a2eeb80947ff00bcf58ffdafeaeb61

*/
pragma solidity ^0.5.4;



library SafeERC20 {
    using Address for address;

    bytes4 constant private TRANSFER_SELECTOR = bytes4(keccak256(bytes("transfer(address,uint256)")));
    bytes4 constant private TRANSFERFROM_SELECTOR = bytes4(keccak256(bytes("transferFrom(address,address,uint256)")));
    bytes4 constant private APPROVE_SELECTOR = bytes4(keccak256(bytes("approve(address,uint256)")));

    function safeTransfer(address _erc20Addr, address _to, uint256 _value) internal {

        // Must be a contract addr first!
        require(_erc20Addr.isContract());

        (bool success, bytes memory returnValue) =
        // solhint-disable-next-line avoid-low-level-calls
        _erc20Addr.call(abi.encodeWithSelector(TRANSFER_SELECTOR, _to, _value));
        // call return false when something wrong
        require(success);
        //check return value
        require(returnValue.length == 0 || (returnValue.length == 32 && (returnValue[31] != 0)));
    }

    function safeTransferFrom(address _erc20Addr, address _from, address _to, uint256 _value) internal {

        // Must be a contract addr first!
        require(_erc20Addr.isContract());

        (bool success, bytes memory returnValue) =
        // solhint-disable-next-line avoid-low-level-calls
        _erc20Addr.call(abi.encodeWithSelector(TRANSFERFROM_SELECTOR, _from, _to, _value));
        // call return false when something wrong
        require(success);
        //check return value
        require(returnValue.length == 0 || (returnValue.length == 32 && (returnValue[31] != 0)));
    }

    function safeApprove(address _erc20Addr, address _spender, uint256 _value) internal {

        // Must be a contract addr first!
        require(_erc20Addr.isContract());

        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero.
        require((_value == 0) || (IERC20(_erc20Addr).allowance(address(this), _spender) == 0));

        (bool success, bytes memory returnValue) =
        // solhint-disable-next-line avoid-low-level-calls
        _erc20Addr.call(abi.encodeWithSelector(APPROVE_SELECTOR, _spender, _value));
        // call return false when something wrong
        require(success);
        //check return value
        require(returnValue.length == 0 || (returnValue.length == 32 && (returnValue[31] != 0)));
    }
}

// File: contracts/controller/Avatar.sol

pragma solidity ^0.5.4;







/**
 * @title An Avatar holds tokens, reputation and ether for a controller
 */
contract Avatar is Ownable {
    using SafeERC20 for address;

    string public orgName;
    DAOToken public nativeToken;
    Reputation public nativeReputation;

    event GenericCall(address indexed _contract, bytes _params, bool _success);
    event SendEther(uint256 _amountInWei, address indexed _to);
    event ExternalTokenTransfer(address indexed _externalToken, address indexed _to, uint256 _value);
    event ExternalTokenTransferFrom(address indexed _externalToken, address _from, address _to, uint256 _value);
    event ExternalTokenApproval(address indexed _externalToken, address _spender, uint256 _value);
    event ReceiveEther(address indexed _sender, uint256 _value);
    event MetaData(string _metaData);

    /**
    * @dev the constructor takes organization name, native token and reputation system
    and creates an avatar for a controller
    */
    constructor(string memory _orgName, DAOToken _nativeToken, Reputation _nativeReputation) public {
        orgName = _orgName;
        nativeToken = _nativeToken;
        nativeReputation = _nativeReputation;
    }

    /**
    * @dev enables an avatar to receive ethers
    */
    function() external payable {
        emit ReceiveEther(msg.sender, msg.value);
    }

    /**
    * @dev perform a generic call to an arbitrary contract
    * @param _contract  the contract's address to call
    * @param _data ABI-encoded contract call to call `_contract` address.
    * @return bool    success or fail
    *         bytes - the return bytes of the called contract's function.
    */
    function genericCall(address _contract, bytes memory _data)
    public
    onlyOwner
    returns(bool success, bytes memory returnValue) {
      // solhint-disable-next-line avoid-low-level-calls
        (success, returnValue) = _contract.call(_data);
        emit GenericCall(_contract, _data, success);
    }

    /**
    * @dev send ethers from the avatar's wallet
    * @param _amountInWei amount to send in Wei units
    * @param _to send the ethers to this address
    * @return bool which represents success
    */
    function sendEther(uint256 _amountInWei, address payable _to) public onlyOwner returns(bool) {
        _to.transfer(_amountInWei);
        emit SendEther(_amountInWei, _to);
        return true;
    }

    /**
    * @dev external token transfer
    * @param _externalToken the token contract
    * @param _to the destination address
    * @param _value the amount of tokens to transfer
    * @return bool which represents success
    */
    function externalTokenTransfer(IERC20 _externalToken, address _to, uint256 _value)
    public onlyOwner returns(bool)
    {
        address(_externalToken).safeTransfer(_to, _value);
        emit ExternalTokenTransfer(address(_externalToken), _to, _value);
        return true;
    }

    /**
    * @dev external token transfer from a specific account
    * @param _externalToken the token contract
    * @param _from the account to spend token from
    * @param _to the destination address
    * @param _value the amount of tokens to transfer
    * @return bool which represents success
    */
    function externalTokenTransferFrom(
        IERC20 _externalToken,
        address _from,
        address _to,
        uint256 _value
    )
    public onlyOwner returns(bool)
    {
        address(_externalToken).safeTransferFrom(_from, _to, _value);
        emit ExternalTokenTransferFrom(address(_externalToken), _from, _to, _value);
        return true;
    }

    /**
    * @dev externalTokenApproval approve the spender address to spend a specified amount of tokens
    *      on behalf of msg.sender.
    * @param _externalToken the address of the Token Contract
    * @param _spender address
    * @param _value the amount of ether (in Wei) which the approval is referring to.
    * @return bool which represents a success
    */
    function externalTokenApproval(IERC20 _externalToken, address _spender, uint256 _value)
    public onlyOwner returns(bool)
    {
        address(_externalToken).safeApprove(_spender, _value);
        emit ExternalTokenApproval(address(_externalToken), _spender, _value);
        return true;
    }

    /**
    * @dev metaData emits an event with a string, should contain the hash of some meta data.
    * @param _metaData a string representing a hash of the meta data
    * @return bool which represents a success
    */
    function metaData(string memory _metaData) public onlyOwner returns(bool) {
        emit MetaData(_metaData);
        return true;
    }


}

// File: contracts/universalSchemes/UniversalSchemeInterface.sol

pragma solidity ^0.5.4;


contract UniversalSchemeInterface {

    function updateParameters(bytes32 _hashedParameters) public;

    function getParametersFromController(Avatar _avatar) internal view returns(bytes32);
}

// File: contracts/globalConstraints/GlobalConstraintInterface.sol

pragma solidity ^0.5.4;


contract GlobalConstraintInterface {

    enum CallPhase { Pre, Post, PreAndPost }

    function pre( address _scheme, bytes32 _params, bytes32 _method ) public returns(bool);
    function post( address _scheme, bytes32 _params, bytes32 _method ) public returns(bool);
    /**
     * @dev when return if this globalConstraints is pre, post or both.
     * @return CallPhase enum indication  Pre, Post or PreAndPost.
     */
    function when() public returns(CallPhase);
}

// File: contracts/controller/ControllerInterface.sol

pragma solidity ^0.5.4;



/**
 * @title Controller contract
 * @dev A controller controls the organizations tokens ,reputation and avatar.
 * It is subject to a set of schemes and constraints that determine its behavior.
 * Each scheme has it own parameters and operation permissions.
 */
interface ControllerInterface {

    /**
     * @dev Mint `_amount` of reputation that are assigned to `_to` .
     * @param  _amount amount of reputation to mint
     * @param _to beneficiary address
     * @return bool which represents a success
    */
    function mintReputation(uint256 _amount, address _to, address _avatar)
    external
    returns(bool);

    /**
     * @dev Burns `_amount` of reputation from `_from`
     * @param _amount amount of reputation to burn
     * @param _from The address that will lose the reputation
     * @return bool which represents a success
     */
    function burnReputation(uint256 _amount, address _from, address _avatar)
    external
    returns(bool);

    /**
     * @dev mint tokens .
     * @param  _amount amount of token to mint
     * @param _beneficiary beneficiary address
     * @param _avatar address
     * @return bool which represents a success
     */
    function mintTokens(uint256 _amount, address _beneficiary, address _avatar)
    external
    returns(bool);

  /**
   * @dev register or update a scheme
   * @param _scheme the address of the scheme
   * @param _paramsHash a hashed configuration of the usage of the scheme
   * @param _permissions the permissions the new scheme will have
   * @param _avatar address
   * @return bool which represents a success
   */
    function registerScheme(address _scheme, bytes32 _paramsHash, bytes4 _permissions, address _avatar)
    external
    returns(bool);

    /**
     * @dev unregister a scheme
     * @param _avatar address
     * @param _scheme the address of the scheme
     * @return bool which represents a success
     */
    function unregisterScheme(address _scheme, address _avatar)
    external
    returns(bool);

    /**
     * @dev unregister the caller's scheme
     * @param _avatar address
     * @return bool which represents a success
     */
    function unregisterSelf(address _avatar) external returns(bool);

    /**
     * @dev add or update Global Constraint
     * @param _globalConstraint the address of the global constraint to be added.
     * @param _params the constraint parameters hash.
     * @param _avatar the avatar of the organization
     * @return bool which represents a success
     */
    function addGlobalConstraint(address _globalConstraint, bytes32 _params, address _avatar)
    external returns(bool);

    /**
     * @dev remove Global Constraint
     * @param _globalConstraint the address of the global constraint to be remove.
     * @param _avatar the organization avatar.
     * @return bool which represents a success
     */
    function removeGlobalConstraint (address _globalConstraint, address _avatar)
    external  returns(bool);

  /**
    * @dev upgrade the Controller
    *      The function will trigger an event 'UpgradeController'.
    * @param  _newController the address of the new controller.
    * @param _avatar address
    * @return bool which represents a success
    */
    function upgradeController(address _newController, Avatar _avatar)
    external returns(bool);

    /**
    * @dev perform a generic call to an arbitrary contract
    * @param _contract  the contract's address to call
    * @param _data ABI-encoded contract call to call `_contract` address.
    * @param _avatar the controller's avatar address
    * @return bool -success
    *         bytes  - the return value of the called _contract's function.
    */
    function genericCall(address _contract, bytes calldata _data, Avatar _avatar)
    external
    returns(bool, bytes memory);

  /**
   * @dev send some ether
   * @param _amountInWei the amount of ether (in Wei) to send
   * @param _to address of the beneficiary
   * @param _avatar address
   * @return bool which represents a success
   */
    function sendEther(uint256 _amountInWei, address payable _to, Avatar _avatar)
    external returns(bool);

    /**
    * @dev send some amount of arbitrary ERC20 Tokens
    * @param _externalToken the address of the Token Contract
    * @param _to address of the beneficiary
    * @param _value the amount of ether (in Wei) to send
    * @param _avatar address
    * @return bool which represents a success
    */
    function externalTokenTransfer(IERC20 _externalToken, address _to, uint256 _value, Avatar _avatar)
    external
    returns(bool);

    /**
    * @dev transfer token "from" address "to" address
    *      One must to approve the amount of tokens which can be spend from the
    *      "from" account.This can be done using externalTokenApprove.
    * @param _externalToken the address of the Token Contract
    * @param _from address of the account to send from
    * @param _to address of the beneficiary
    * @param _value the amount of ether (in Wei) to send
    * @param _avatar address
    * @return bool which represents a success
    */
    function externalTokenTransferFrom(
    IERC20 _externalToken,
    address _from,
    address _to,
    uint256 _value,
    Avatar _avatar)
    external
    returns(bool);

    /**
    * @dev externalTokenApproval approve the spender address to spend a specified amount of tokens
    *      on behalf of msg.sender.
    * @param _externalToken the address of the Token Contract
    * @param _spender address
    * @param _value the amount of ether (in Wei) which the approval is referring to.
    * @return bool which represents a success
    */
    function externalTokenApproval(IERC20 _externalToken, address _spender, uint256 _value, Avatar _avatar)
    external
    returns(bool);

    /**
    * @dev metaData emits an event with a string, should contain the hash of some meta data.
    * @param _metaData a string representing a hash of the meta data
    * @param _avatar Avatar
    * @return bool which represents a success
    */
    function metaData(string calldata _metaData, Avatar _avatar) external returns(bool);

    /**
     * @dev getNativeReputation
     * @param _avatar the organization avatar.
     * @return organization native reputation
     */
    function getNativeReputation(address _avatar)
    external
    view
    returns(address);

    function isSchemeRegistered( address _scheme, address _avatar) external view returns(bool);

    function getSchemeParameters(address _scheme, address _avatar) external view returns(bytes32);

    function getGlobalConstraintParameters(address _globalConstraint, address _avatar) external view returns(bytes32);

    function getSchemePermissions(address _scheme, address _avatar) external view returns(bytes4);

    /**
     * @dev globalConstraintsCount return the global constraint pre and post count
     * @return uint256 globalConstraintsPre count.
     * @return uint256 globalConstraintsPost count.
     */
    function globalConstraintsCount(address _avatar) external view returns(uint, uint);

    function isGlobalConstraintRegistered(address _globalConstraint, address _avatar) external view returns(bool);
}

// File: contracts/universalSchemes/UniversalScheme.sol

pragma solidity ^0.5.4;






contract UniversalScheme is Ownable, UniversalSchemeInterface {
    bytes32 public hashedParameters; // For other parameters.

    function updateParameters(
        bytes32 _hashedParameters
    )
        public
        onlyOwner
    {
        hashedParameters = _hashedParameters;
    }

    /**
    *  @dev get the parameters for the current scheme from the controller
    */
    function getParametersFromController(Avatar _avatar) internal view returns(bytes32) {
        require(ControllerInterface(_avatar.owner()).isSchemeRegistered(address(this), address(_avatar)),
        "scheme is not registered");
        return ControllerInterface(_avatar.owner()).getSchemeParameters(address(this), address(_avatar));
    }
}

// File: openzeppelin-solidity/contracts/cryptography/ECDSA.sol

pragma solidity ^0.5.0;

/**
 * @title Elliptic curve signature operations
 * @dev Based on https://gist.github.com/axic/5b33912c6f61ae6fd96d6c4a47afde6d
 * TODO Remove this library once solidity supports passing a signature to ecrecover.
 * See https://github.com/ethereum/solidity/issues/864
 */

library ECDSA {
    /**
     * @dev Recover signer address from a message by using their signature
     * @param hash bytes32 message, the hash is the signed message. What is recovered is the signer address.
     * @param signature bytes signature, the signature is generated using web3.eth.sign()
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        bytes32 r;
        bytes32 s;
        uint8 v;

        // Check the signature length
        if (signature.length != 65) {
            return (address(0));
        }

        // Divide the signature in r, s and v variables
        // ecrecover takes the signature parameters, and the only way to get them
        // currently is to use assembly.
        // solhint-disable-next-line no-inline-assembly
        assembly {
            r := mload(add(signature, 0x20))
            s := mload(add(signature, 0x40))
            v := byte(0, mload(add(signature, 0x60)))
        }

        // Version of signature should be 27 or 28, but 0 and 1 are also possible versions
        if (v < 27) {
            v += 27;
        }

        // If the version is correct return the signer address
        if (v != 27 && v != 28) {
            return (address(0));
        } else {
            return ecrecover(hash, v, r, s);
        }
    }

    /**
     * toEthSignedMessageHash
     * @dev prefix a bytes32 value with "\x19Ethereum Signed Message:"
     * and hash the result
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }
}

// File: ../infra/contracts/libs/RealMath.sol

pragma solidity ^0.5.4;

/**
 * RealMath: fixed-point math library, based on fractional and integer parts.
 * Using uint256 as real216x40, which isn't in Solidity yet.
 * Internally uses the wider uint256 for some math.
 *
 * Note that for addition, subtraction, and mod (%), you should just use the
 * built-in Solidity operators. Functions for these operations are not provided.
 *
 */


library RealMath {

    /**
     * How many total bits are there?
     */
    uint256 constant private REAL_BITS = 256;

    /**
     * How many fractional bits are there?
     */
    uint256 constant private REAL_FBITS = 40;

    /**
     * What's the first non-fractional bit
     */
    uint256 constant private REAL_ONE = uint256(1) << REAL_FBITS;

    /**
     * Raise a real number to any positive integer power
     */
    function pow(uint256 realBase, uint256 exponent) internal pure returns (uint256) {

        uint256 tempRealBase = realBase;
        uint256 tempExponent = exponent;

        // Start with the 0th power
        uint256 realResult = REAL_ONE;
        while (tempExponent != 0) {
            // While there are still bits set
            if ((tempExponent & 0x1) == 0x1) {
                // If the low bit is set, multiply in the (many-times-squared) base
                realResult = mul(realResult, tempRealBase);
            }
                // Shift off the low bit
            tempExponent = tempExponent >> 1;
            if (tempExponent != 0) {
                // Do the squaring
                tempRealBase = mul(tempRealBase, tempRealBase);
            }
        }

        // Return the final result.
        return realResult;
    }

    /**
     * Create a real from a rational fraction.
     */
    function fraction(uint216 numerator, uint216 denominator) internal pure returns (uint256) {
        return div(uint256(numerator) * REAL_ONE, uint256(denominator) * REAL_ONE);
    }

    /**
     * Multiply one real by another. Truncates overflows.
     */
    function mul(uint256 realA, uint256 realB) private pure returns (uint256) {
        // When multiplying fixed point in x.y and z.w formats we get (x+z).(y+w) format.
        // So we just have to clip off the extra REAL_FBITS fractional bits.
        uint256 res = realA * realB;
        require(res/realA == realB, "RealMath mul overflow");
        return (res >> REAL_FBITS);
    }

    /**
     * Divide one real by another real. Truncates overflows.
     */
    function div(uint256 realNumerator, uint256 realDenominator) private pure returns (uint256) {
        // We use the reverse of the multiplication trick: convert numerator from
        // x.y to (x+z).(y+w) fixed point, then divide by denom in z.w fixed point.
        return uint256((uint256(realNumerator) * REAL_ONE) / uint256(realDenominator));
    }

}

// File: ../infra/contracts/votingMachines/ProposalExecuteInterface.sol

pragma solidity ^0.5.4;

interface ProposalExecuteInterface {
    function executeProposal(bytes32 _proposalId, int _decision) external returns(bool);
}

// File: openzeppelin-solidity/contracts/math/Math.sol

pragma solidity ^0.5.0;

/**
 * @title Math
 * @dev Assorted math operations
 */
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 Calculates the average of two numbers. Since these are integers,
    * averages of an even and odd number cannot be represented, and will be
    * rounded down.
    */
    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);
    }
}

// File: ../infra/contracts/votingMachines/GenesisProtocolLogic.sol

pragma solidity ^0.5.4;











/**
 * @title GenesisProtocol implementation -an organization's voting machine scheme.
 */
contract GenesisProtocolLogic is IntVoteInterface {
    using SafeMath for uint256;
    using Math for uint256;
    using RealMath for uint216;
    using RealMath for uint256;
    using Address for address;

    enum ProposalState { None, ExpiredInQueue, Executed, Queued, PreBoosted, Boosted, QuietEndingPeriod}
    enum ExecutionState { None, QueueBarCrossed, QueueTimeOut, PreBoostedBarCrossed, BoostedTimeOut, BoostedBarCrossed}

    //Organization's parameters
    struct Parameters {
        uint256 queuedVoteRequiredPercentage; // the absolute vote percentages bar.
        uint256 queuedVotePeriodLimit; //the time limit for a proposal to be in an absolute voting mode.
        uint256 boostedVotePeriodLimit; //the time limit for a proposal to be in boost mode.
        uint256 preBoostedVotePeriodLimit; //the time limit for a proposal
                                          //to be in an preparation state (stable) before boosted.
        uint256 thresholdConst; //constant  for threshold calculation .
                                //threshold =thresholdConst ** (numberOfBoostedProposals)
        uint256 limitExponentValue;// an upper limit for numberOfBoostedProposals
                                   //in the threshold calculation to prevent overflow
        uint256 quietEndingPeriod; //quite ending period
        uint256 proposingRepReward;//proposer reputation reward.
        uint256 votersReputationLossRatio;//Unsuccessful pre booster
                                          //voters lose votersReputationLossRatio% of their reputation.
        uint256 minimumDaoBounty;
        uint256 daoBountyConst;//The DAO downstake for each proposal is calculate according to the formula
                               //(daoBountyConst * averageBoostDownstakes)/100 .
        uint256 activationTime;//the point in time after which proposals can be created.
        //if this address is set so only this address is allowed to vote of behalf of someone else.
        address voteOnBehalf;
    }

    struct Voter {
        uint256 vote; // YES(1) ,NO(2)
        uint256 reputation; // amount of voter's reputation
        bool preBoosted;
    }

    struct Staker {
        uint256 vote; // YES(1) ,NO(2)
        uint256 amount; // amount of staker's stake
        uint256 amount4Bounty;// amount of staker's stake used for bounty reward calculation.
    }

    struct Proposal {
        bytes32 organizationId; // the organization unique identifier the proposal is target to.
        address callbacks;    // should fulfill voting callbacks interface.
        ProposalState state;
        uint256 winningVote; //the winning vote.
        address proposer;
        //the proposal boosted period limit . it is updated for the case of quiteWindow mode.
        uint256 currentBoostedVotePeriodLimit;
        bytes32 paramsHash;
        uint256 daoBountyRemain; //use for checking sum zero bounty claims.it is set at the proposing time.
        uint256 daoBounty;
        uint256 totalStakes;// Total number of tokens staked which can be redeemable by stakers.
        uint256 confidenceThreshold;
        //The percentage from upper stakes which the caller for the expiration was given.
        uint256 expirationCallBountyPercentage;
        uint[3] times; //times[0] - submittedTime
                       //times[1] - boostedPhaseTime
                       //times[2] -preBoostedPhaseTime;
        bool daoRedeemItsWinnings;
        //      vote      reputation
        mapping(uint256   =>  uint256    ) votes;
        //      vote      reputation
        mapping(uint256   =>  uint256    ) preBoostedVotes;
        //      address     voter
        mapping(address =>  Voter    ) voters;
        //      vote        stakes
        mapping(uint256   =>  uint256    ) stakes;
        //      address  staker
        mapping(address  => Staker   ) stakers;
    }

    event Stake(bytes32 indexed _proposalId,
        address indexed _organization,
        address indexed _staker,
        uint256 _vote,
        uint256 _amount
    );

    event Redeem(bytes32 indexed _proposalId,
        address indexed _organization,
        address indexed _beneficiary,
        uint256 _amount
    );

    event RedeemDaoBounty(bytes32 indexed _proposalId,
        address indexed _organization,
        address indexed _beneficiary,
        uint256 _amount
    );

    event RedeemReputation(bytes32 indexed _proposalId,
        address indexed _organization,
        address indexed _beneficiary,
        uint256 _amount
    );

    event StateChange(bytes32 indexed _proposalId, ProposalState _proposalState);
    event GPExecuteProposal(bytes32 indexed _proposalId, ExecutionState _executionState);
    event ExpirationCallBounty(bytes32 indexed _proposalId, address indexed _beneficiary, uint256 _amount);
    event ConfidenceLevelChange(bytes32 indexed _proposalId, uint256 _confidenceThreshold);

    mapping(bytes32=>Parameters) public parameters;  // A mapping from hashes to parameters
    mapping(bytes32=>Proposal) public proposals; // Mapping from the ID of the proposal to the proposal itself.
    mapping(bytes32=>uint) public orgBoostedProposalsCnt;
           //organizationId => organization
    mapping(bytes32        => address     ) public organizations;
          //organizationId => averageBoostDownstakes
    mapping(bytes32           => uint256              ) public averagesDownstakesOfBoosted;
    uint256 constant public NUM_OF_CHOICES = 2;
    uint256 constant public NO = 2;
    uint256 constant public YES = 1;
    uint256 public proposalsCnt; // Total number of proposals
    IERC20 public stakingToken;
    address constant private GEN_TOKEN_ADDRESS = 0x543Ff227F64Aa17eA132Bf9886cAb5DB55DCAddf;
    uint256 constant private MAX_BOOSTED_PROPOSALS = 4096;

    /**
     * @dev Constructor
     */
    constructor(IERC20 _stakingToken) public {
      //The GEN token (staking token) address is hard coded in the contract by GEN_TOKEN_ADDRESS .
      //This will work for a network which already hosted the GEN token on this address (e.g mainnet).
      //If such contract address does not exist in the network (e.g ganache)
      //the contract will use the _stakingToken param as the
      //staking token address.
        if (address(GEN_TOKEN_ADDRESS).isContract()) {
            stakingToken = IERC20(GEN_TOKEN_ADDRESS);
        } else {
            stakingToken = _stakingToken;
        }
    }

  /**
   * @dev Check that the proposal is votable
   * a proposal is votable if it is in one of the following states:
   *  PreBoosted,Boosted,QuietEndingPeriod or Queued
   */
    modifier votable(bytes32 _proposalId) {
        require(_isVotable(_proposalId));
        _;
    }

    /**
     * @dev register a new proposal with the given parameters. Every proposal has a unique ID which is being
     * generated by calculating keccak256 of a incremented counter.
     * @param _paramsHash parameters hash
     * @param _proposer address
     * @param _organization address
     */
    function propose(uint256, bytes32 _paramsHash, address _proposer, address _organization)
        external
        returns(bytes32)
    {
      // solhint-disable-next-line not-rely-on-time
        require(now > parameters[_paramsHash].activationTime, "not active yet");
        //Check parameters existence.
        require(parameters[_paramsHash].queuedVoteRequiredPercentage >= 50);
        // Generate a unique ID:
        bytes32 proposalId = keccak256(abi.encodePacked(this, proposalsCnt));
        proposalsCnt = proposalsCnt.add(1);
         // Open proposal:
        Proposal memory proposal;
        proposal.callbacks = msg.sender;
        proposal.organizationId = keccak256(abi.encodePacked(msg.sender, _organization));

        proposal.state = ProposalState.Queued;
        // solhint-disable-next-line not-rely-on-time
        proposal.times[0] = now;//submitted time
        proposal.currentBoostedVotePeriodLimit = parameters[_paramsHash].boostedVotePeriodLimit;
        proposal.proposer = _proposer;
        proposal.winningVote = NO;
        proposal.paramsHash = _paramsHash;
        if (organizations[proposal.organizationId] == address(0)) {
            if (_organization == address(0)) {
                organizations[proposal.organizationId] = msg.sender;
            } else {
                organizations[proposal.organizationId] = _organization;
            }
        }
        //calc dao bounty
        uint256 daoBounty =
        parameters[_paramsHash].daoBountyConst.mul(averagesDownstakesOfBoosted[proposal.organizationId]).div(100);
        if (daoBounty < parameters[_paramsHash].minimumDaoBounty) {
            proposal.daoBountyRemain = parameters[_paramsHash].minimumDaoBounty;
        } else {
            proposal.daoBountyRemain = daoBounty;
        }
        proposal.totalStakes = proposal.daoBountyRemain;
        proposals[proposalId] = proposal;
        proposals[proposalId].stakes[NO] = proposal.daoBountyRemain;//dao downstake on the proposal

        emit NewProposal(proposalId, organizations[proposal.organizationId], NUM_OF_CHOICES, _proposer, _paramsHash);
        return proposalId;
    }

    /**
      * @dev executeBoosted try to execute a boosted or QuietEndingPeriod proposal if it is expired
      * @param _proposalId the id of the proposal
      * @return uint256 expirationCallBounty the bounty amount for the expiration call
     */
    function executeBoosted(bytes32 _proposalId) external returns(uint256 expirationCallBounty) {
        Proposal storage proposal = proposals[_proposalId];
        require(proposal.state == ProposalState.Boosted || proposal.state == ProposalState.QuietEndingPeriod,
        "proposal state in not Boosted nor QuietEndingPeriod");
        require(_execute(_proposalId), "proposal need to expire");
        uint256 expirationCallBountyPercentage =
        // solhint-disable-next-line not-rely-on-time
        (uint(1).add(now.sub(proposal.currentBoostedVotePeriodLimit.add(proposal.times[1])).div(15)));
        if (expirationCallBountyPercentage > 100) {
            expirationCallBountyPercentage = 100;
        }
        proposal.expirationCallBountyPercentage = expirationCallBountyPercentage;
        expirationCallBounty = expirationCallBountyPercentage.mul(proposal.stakes[YES]).div(100);
        require(stakingToken.transfer(msg.sender, expirationCallBounty), "transfer to msg.sender failed");
        emit ExpirationCallBounty(_proposalId, msg.sender, expirationCallBounty);
    }

    /**
     * @dev hash the parameters, save them if necessary, and return the hash value
     * @param _params a parameters array
     *    _params[0] - _queuedVoteRequiredPercentage,
     *    _params[1] - _queuedVotePeriodLimit, //the time limit for a proposal to be in an absolute voting mode.
     *    _params[2] - _boostedVotePeriodLimit, //the time limit for a proposal to be in an relative voting mode.
     *    _params[3] - _preBoostedVotePeriodLimit, //the time limit for a proposal to be in an preparation
     *                  state (stable) before boosted.
     *    _params[4] -_thresholdConst
     *    _params[5] -_quietEndingPeriod
     *    _params[6] -_proposingRepReward
     *    _params[7] -_votersReputationLossRatio
     *    _params[8] -_minimumDaoBounty
     *    _params[9] -_daoBountyConst
     *    _params[10] -_activationTime
     * @param _voteOnBehalf - authorized to vote on behalf of others.
    */
    function setParameters(
        uint[11] calldata _params, //use array here due to stack too deep issue.
        address _voteOnBehalf
    )
    external
    returns(bytes32)
    {
        require(_params[0] <= 100 && _params[0] >= 50, "50 <= queuedVoteRequiredPercentage <= 100");
        require(_params[4] <= 16000 && _params[4] > 1000, "1000 < thresholdConst <= 16000");
        require(_params[7] <= 100, "votersReputationLossRatio <= 100");
        require(_params[2] >= _params[5], "boostedVotePeriodLimit >= quietEndingPeriod");
        require(_params[8] > 0, "minimumDaoBounty should be > 0");
        require(_params[9] > 0, "daoBountyConst should be > 0");

        bytes32 paramsHash = getParametersHash(_params, _voteOnBehalf);
        //set a limit for power for a given alpha to prevent overflow
        uint256 limitExponent = 172;//for alpha less or equal 2
        uint256 j = 2;
        for (uint256 i = 2000; i < 16000; i = i*2) {
            if ((_params[4] > i) && (_params[4] <= i*2)) {
                limitExponent = limitExponent/j;
                break;
            }
            j++;
        }

        parameters[paramsHash] = Parameters({
            queuedVoteRequiredPercentage: _params[0],
            queuedVotePeriodLimit: _params[1],
            boostedVotePeriodLimit: _params[2],
            preBoostedVotePeriodLimit: _params[3],
            thresholdConst:uint216(_params[4]).fraction(uint216(1000)),
            limitExponentValue:limitExponent,
            quietEndingPeriod: _params[5],
            proposingRepReward: _params[6],
            votersReputationLossRatio:_params[7],
            minimumDaoBounty:_params[8],
            daoBountyConst:_params[9],
            activationTime:_params[10],
            voteOnBehalf:_voteOnBehalf
        });
        return paramsHash;
    }

    /**
     * @dev redeem a reward for a successful stake, vote or proposing.
     * The function use a beneficiary address as a parameter (and not msg.sender) to enable
     * users to redeem on behalf of someone else.
     * @param _proposalId the ID of the proposal
     * @param _beneficiary - the beneficiary address
     * @return rewards -
     *           [0] stakerTokenReward
     *           [1] voterReputationReward
     *           [2] proposerReputationReward
     */
     // solhint-disable-next-line function-max-lines,code-complexity
    function redeem(bytes32 _proposalId, address _beneficiary) public returns (uint[3] memory rewards) {
        Proposal storage proposal = proposals[_proposalId];
        require((proposal.state == ProposalState.Executed)||(proposal.state == ProposalState.ExpiredInQueue),
        "Proposal should be Executed or ExpiredInQueue");
        Parameters memory params = parameters[proposal.paramsHash];
        uint256 lostReputation;
        if (proposal.winningVote == YES) {
            lostReputation = proposal.preBoostedVotes[NO];
        } else {
            lostReputation = proposal.preBoostedVotes[YES];
        }
        lostReputation = (lostReputation.mul(params.votersReputationLossRatio))/100;
        //as staker
        Staker storage staker = proposal.stakers[_beneficiary];
        uint256 totalStakes = proposal.stakes[NO].add(proposal.stakes[YES]);
        uint256 totalWinningStakes = proposal.stakes[proposal.winningVote];

        if (staker.amount > 0) {
            uint256 totalStakesLeftAfterCallBounty =
            totalStakes.sub(proposal.expirationCallBountyPercentage.mul(proposal.stakes[YES]).div(100));
            if (proposal.state == ProposalState.ExpiredInQueue) {
                //Stakes of a proposal that expires in Queue are sent back to stakers
                rewards[0] = staker.amount;
            } else if (staker.vote == proposal.winningVote) {
                if (staker.vote == YES) {
                    if (proposal.daoBounty < totalStakesLeftAfterCallBounty) {
                        uint256 _totalStakes = totalStakesLeftAfterCallBounty.sub(proposal.daoBounty);
                        rewards[0] = (staker.amount.mul(_totalStakes))/totalWinningStakes;
                    }
                } else {
                    rewards[0] = (staker.amount.mul(totalStakesLeftAfterCallBounty))/totalWinningStakes;
                }
            }
            staker.amount = 0;
        }
            //dao redeem its winnings
        if (proposal.daoRedeemItsWinnings == false &&
            _beneficiary == organizations[proposal.organizationId] &&
            proposal.state != ProposalState.ExpiredInQueue &&
            proposal.winningVote == NO) {
            rewards[0] =
            rewards[0].add((proposal.daoBounty.mul(totalStakes))/totalWinningStakes).sub(proposal.daoBounty);
            proposal.daoRedeemItsWinnings = true;
        }

        //as voter
        Voter storage voter = proposal.voters[_beneficiary];
        if ((voter.reputation != 0) && (voter.preBoosted)) {
            if (proposal.state == ProposalState.ExpiredInQueue) {
              //give back reputation for the voter
                rewards[1] = ((voter.reputation.mul(params.votersReputationLossRatio))/100);
            } else if (proposal.winningVote == voter.vote) {
                rewards[1] = ((voter.reputation.mul(params.votersReputationLossRatio))/100)
                .add((voter.reputation.mul(lostReputation))/proposal.preBoostedVotes[proposal.winningVote]);
            }
            voter.reputation = 0;
        }
        //as proposer
        if ((proposal.proposer == _beneficiary)&&(proposal.winningVote == YES)&&(proposal.proposer != address(0))) {
            rewards[2] = params.proposingRepReward;
            proposal.proposer = address(0);
        }
        if (rewards[0] != 0) {
            proposal.totalStakes = proposal.totalStakes.sub(rewards[0]);
            require(stakingToken.transfer(_beneficiary, rewards[0]), "transfer to beneficiary failed");
            emit Redeem(_proposalId, organizations[proposal.organizationId], _beneficiary, rewards[0]);
        }
        if (rewards[1].add(rewards[2]) != 0) {
            VotingMachineCallbacksInterface(proposal.callbacks)
            .mintReputation(rewards[1].add(rewards[2]), _beneficiary, _proposalId);
            emit RedeemReputation(
            _proposalId,
            organizations[proposal.organizationId],
            _beneficiary,
            rewards[1].add(rewards[2])
            );
        }
    }

    /**
     * @dev redeemDaoBounty a reward for a successful stake.
     * The function use a beneficiary address as a parameter (and not msg.sender) to enable
     * users to redeem on behalf of someone else.
     * @param _proposalId the ID of the proposal
     * @param _beneficiary - the beneficiary address
     * @return redeemedAmount - redeem token amount
     * @return potentialAmount - potential redeem token amount(if there is enough tokens bounty at the organization )
     */
    function redeemDaoBounty(bytes32 _proposalId, address _beneficiary)
    public
    returns(uint256 redeemedAmount, uint256 potentialAmount) {
        Proposal storage proposal = proposals[_proposalId];
        require(proposal.state == ProposalState.Executed);
        uint256 totalWinningStakes = proposal.stakes[proposal.winningVote];
        Staker storage staker = proposal.stakers[_beneficiary];
        if (
            (staker.amount4Bounty > 0)&&
            (staker.vote == proposal.winningVote)&&
            (proposal.winningVote == YES)&&
            (totalWinningStakes != 0)) {
            //as staker
                potentialAmount = (staker.amount4Bounty * proposal.daoBounty)/totalWinningStakes;
            }
        if ((potentialAmount != 0)&&
            (VotingMachineCallbacksInterface(proposal.callbacks)
            .balanceOfStakingToken(stakingToken, _proposalId) >= potentialAmount)) {
            staker.amount4Bounty = 0;
            proposal.daoBountyRemain = proposal.daoBountyRemain.sub(potentialAmount);
            require(
            VotingMachineCallbacksInterface(proposal.callbacks)
            .stakingTokenTransfer(stakingToken, _beneficiary, potentialAmount, _proposalId));
            redeemedAmount = potentialAmount;
            emit RedeemDaoBounty(_proposalId, organizations[proposal.organizationId], _beneficiary, redeemedAmount);
        }
    }

    /**
     * @dev shouldBoost check if a proposal should be shifted to boosted phase.
     * @param _proposalId the ID of the proposal
     * @return bool true or false.
     */
    function shouldBoost(bytes32 _proposalId) public view returns(bool) {
        Proposal memory proposal = proposals[_proposalId];
        return (_score(_proposalId) > threshold(proposal.paramsHash, proposal.organizationId));
    }

    /**
     * @dev threshold return the organization's score threshold which required by
     * a proposal to shift to boosted state.
     * This threshold is dynamically set and it depend on the number of boosted proposal.
     * @param _organizationId the organization identifier
     * @param _paramsHash the organization parameters hash
     * @return uint256 organization's score threshold as real number.
     */
    function threshold(bytes32 _paramsHash, bytes32 _organizationId) public view returns(uint256) {
        uint256 power = orgBoostedProposalsCnt[_organizationId];
        Parameters storage params = parameters[_paramsHash];

        if (power > params.limitExponentValue) {
            power = params.limitExponentValue;
        }

        return params.thresholdConst.pow(power);
    }

  /**
   * @dev hashParameters returns a hash of the given parameters
   */
    function getParametersHash(
        uint[11] memory _params,//use array here due to stack too deep issue.
        address _voteOnBehalf
    )
        public
        pure
        returns(bytes32)
        {
        //double call to keccak256 to avoid deep stack issue when call with too many params.
        return keccak256(
            abi.encodePacked(
            keccak256(
            abi.encodePacked(
                _params[0],
                _params[1],
                _params[2],
                _params[3],
                _params[4],
                _params[5],
                _params[6],
                _params[7],
                _params[8],
                _params[9],
                _params[10])
            ),
            _voteOnBehalf
        ));
    }

    /**
      * @dev execute check if the proposal has been decided, and if so, execute the proposal
      * @param _proposalId the id of the proposal
      * @return bool true - the proposal has been executed
      *              false - otherwise.
     */
     // solhint-disable-next-line function-max-lines,code-complexity
    function _execute(bytes32 _proposalId) internal votable(_proposalId) returns(bool) {
        Proposal storage proposal = proposals[_proposalId];
        Parameters memory params = parameters[proposal.paramsHash];
        Proposal memory tmpProposal = proposal;
        uint256 totalReputation =
        VotingMachineCallbacksInterface(proposal.callbacks).getTotalReputationSupply(_proposalId);
        //first divide by 100 to prevent overflow
        uint256 executionBar = (totalReputation/100) * params.queuedVoteRequiredPercentage;
        ExecutionState executionState = ExecutionState.None;
        uint256 averageDownstakesOfBoosted;
        uint256 confidenceThreshold;

        if (proposal.votes[proposal.winningVote] > executionBar) {
         // someone crossed the absolute vote execution bar.
            if (proposal.state == ProposalState.Queued) {
                executionState = ExecutionState.QueueBarCrossed;
            } else if (proposal.state == ProposalState.PreBoosted) {
                executionState = ExecutionState.PreBoostedBarCrossed;
            } else {
                executionState = ExecutionState.BoostedBarCrossed;
            }
            proposal.state = ProposalState.Executed;
        } else {
            if (proposal.state == ProposalState.Queued) {
                // solhint-disable-next-line not-rely-on-time
                if ((now - proposal.times[0]) >= params.queuedVotePeriodLimit) {
                    proposal.state = ProposalState.ExpiredInQueue;
                    proposal.winningVote = NO;
                    executionState = ExecutionState.QueueTimeOut;
                } else {
                    confidenceThreshold = threshold(proposal.paramsHash, proposal.organizationId);
                    if (_score(_proposalId) > confidenceThreshold) {
                        //change proposal mode to PreBoosted mode.
                        proposal.state = ProposalState.PreBoosted;
                        // solhint-disable-next-line not-rely-on-time
                        proposal.times[2] = now;
                        proposal.confidenceThreshold = confidenceThreshold;
                    }
                }
            }

            if (proposal.state == ProposalState.PreBoosted) {
                confidenceThreshold = threshold(proposal.paramsHash, proposal.organizationId);
              // solhint-disable-next-line not-rely-on-time
                if ((now - proposal.times[2]) >= params.preBoostedVotePeriodLimit) {
                    if ((_score(_proposalId) > confidenceThreshold) &&
                        (orgBoostedProposalsCnt[proposal.organizationId] < MAX_BOOSTED_PROPOSALS)) {
                       //change proposal mode to Boosted mode.
                        proposal.state = ProposalState.Boosted;
                       // solhint-disable-next-line not-rely-on-time
                        proposal.times[1] = now;
                        orgBoostedProposalsCnt[proposal.organizationId]++;
                       //add a value to average -> average = average + ((value - average) / nbValues)
                        averageDownstakesOfBoosted = averagesDownstakesOfBoosted[proposal.organizationId];
                        // solium-disable-next-line indentation
                        averagesDownstakesOfBoosted[proposal.organizationId] =
                            uint256(int256(averageDownstakesOfBoosted) +
                            ((int256(proposal.stakes[NO])-int256(averageDownstakesOfBoosted))/
                            int256(orgBoostedProposalsCnt[proposal.organizationId])));
                    }
                } else { //check the Confidence level is stable
                    uint256 proposalScore = _score(_proposalId);
                    if (proposalScore <= proposal.confidenceThreshold.min(confidenceThreshold)) {
                        proposal.state = ProposalState.Queued;
                    } else if (proposal.confidenceThreshold > proposalScore) {
                        proposal.confidenceThreshold = confidenceThreshold;
                        emit ConfidenceLevelChange(_proposalId, confidenceThreshold);
                    }
                }
            }
        }

        if ((proposal.state == ProposalState.Boosted) ||
            (proposal.state == ProposalState.QuietEndingPeriod)) {
            // solhint-disable-next-line not-rely-on-time
            if ((now - proposal.times[1]) >= proposal.currentBoostedVotePeriodLimit) {
                proposal.state = ProposalState.Executed;
                executionState = ExecutionState.BoostedTimeOut;
            }
        }

        if (executionState != ExecutionState.None) {
            if ((executionState == ExecutionState.BoostedTimeOut) ||
                (executionState == ExecutionState.BoostedBarCrossed)) {
                orgBoostedProposalsCnt[tmpProposal.organizationId] =
                orgBoostedProposalsCnt[tmpProposal.organizationId].sub(1);
                //remove a value from average = ((average * nbValues) - value) / (nbValues - 1);
                uint256 boostedProposals = orgBoostedProposalsCnt[tmpProposal.organizationId];
                if (boostedProposals == 0) {
                    averagesDownstakesOfBoosted[proposal.organizationId] = 0;
                } else {
                    averageDownstakesOfBoosted = averagesDownstakesOfBoosted[proposal.organizationId];
                    averagesDownstakesOfBoosted[proposal.organizationId] =
                    (averageDownstakesOfBoosted.mul(boostedProposals+1).sub(proposal.stakes[NO]))/boostedProposals;
                }
            }
            emit ExecuteProposal(
            _proposalId,
            organizations[proposal.organizationId],
            proposal.winningVote,
            totalReputation
            );
            emit GPExecuteProposal(_proposalId, executionState);
            ProposalExecuteInterface(proposal.callbacks).executeProposal(_proposalId, int(proposal.winningVote));
            proposal.daoBounty = proposal.daoBountyRemain;
        }
        if (tmpProposal.state != proposal.state) {
            emit StateChange(_proposalId, proposal.state);
        }
        return (executionState != ExecutionState.None);
    }

    /**
     * @dev staking function
     * @param _proposalId id of the proposal
     * @param _vote  NO(2) or YES(1).
     * @param _amount the betting amount
     * @return bool true - the proposal has been executed
     *              false - otherwise.
     */
    function _stake(bytes32 _proposalId, uint256 _vote, uint256 _amount, address _staker) internal returns(bool) {
        // 0 is not a valid vote.
        require(_vote <= NUM_OF_CHOICES && _vote > 0, "wrong vote value");
        require(_amount > 0, "staking amount should be >0");

        if (_execute(_proposalId)) {
            return true;
        }
        Proposal storage proposal = proposals[_proposalId];

        if ((proposal.state != ProposalState.PreBoosted) &&
            (proposal.state != ProposalState.Queued)) {
            return false;
        }

        // enable to increase stake only on the previous stake vote
        Staker storage staker = proposal.stakers[_staker];
        if ((staker.amount > 0) && (staker.vote != _vote)) {
            return false;
        }

        uint256 amount = _amount;
        require(stakingToken.transferFrom(_staker, address(this), amount), "fail transfer from staker");
        proposal.totalStakes = proposal.totalStakes.add(amount); //update totalRedeemableStakes
        staker.amount = staker.amount.add(amount);
        //This is to prevent average downstakes calculation overflow
        //Note that any how GEN cap is 100000000 ether.
        require(staker.amount <= 0x100000000000000000000000000000000, "staking amount is too high");
        require(proposal.totalStakes <= 0x100000000000000000000000000000000, "total stakes is too high");

        if (_vote == YES) {
            staker.amount4Bounty = staker.amount4Bounty.add(amount);
        }
        staker.vote = _vote;

        proposal.stakes[_vote] = amount.add(proposal.stakes[_vote]);
        emit Stake(_proposalId, organizations[proposal.organizationId], _staker, _vote, _amount);
        return _execute(_proposalId);
    }

    /**
     * @dev Vote for a proposal, if the voter already voted, cancel the last vote and set a new one instead
     * @param _proposalId id of the proposal
     * @param _voter used in case the vote is cast for someone else
     * @param _vote a value between 0 to and the proposal's number of choices.
     * @param _rep how many reputation the voter would like to stake for this vote.
     *         if  _rep==0 so the voter full reputation will be use.
     * @return true in case of proposal execution otherwise false
     * throws if proposal is not open or if it has been executed
     * NB: executes the proposal if a decision has been reached
     */
     // solhint-disable-next-line function-max-lines,code-complexity
    function internalVote(bytes32 _proposalId, address _voter, uint256 _vote, uint256 _rep) internal returns(bool) {
        require(_vote <= NUM_OF_CHOICES && _vote > 0, "0 < _vote <= 2");
        if (_execute(_proposalId)) {
            return true;
        }

        Parameters memory params = parameters[proposals[_proposalId].paramsHash];
        Proposal storage proposal = proposals[_proposalId];

        // Check voter has enough reputation:
        uint256 reputation = VotingMachineCallbacksInterface(proposal.callbacks).reputationOf(_voter, _proposalId);
        require(reputation > 0, "_voter must have reputation");
        require(reputation >= _rep, "reputation >= _rep");
        uint256 rep = _rep;
        if (rep == 0) {
            rep = reputation;
        }
        // If this voter has already voted, return false.
        if (proposal.voters[_voter].reputation != 0) {
            return false;
        }
        // The voting itself:
        proposal.votes[_vote] = rep.add(proposal.votes[_vote]);
        //check if the current winningVote changed or there is a tie.
        //for the case there is a tie the current winningVote set to NO.
        if ((proposal.votes[_vote] > proposal.votes[proposal.winningVote]) ||
            ((proposal.votes[NO] == proposal.votes[proposal.winningVote]) &&
            proposal.winningVote == YES)) {
            if (proposal.state == ProposalState.Boosted &&
            // solhint-disable-next-line not-rely-on-time
                ((now - proposal.times[1]) >= (params.boostedVotePeriodLimit - params.quietEndingPeriod))||
                proposal.state == ProposalState.QuietEndingPeriod) {
                //quietEndingPeriod
                if (proposal.state != ProposalState.QuietEndingPeriod) {
                    proposal.currentBoostedVotePeriodLimit = params.quietEndingPeriod;
                    proposal.state = ProposalState.QuietEndingPeriod;
                }
                // solhint-disable-next-line not-rely-on-time
                proposal.times[1] = now;
            }
            proposal.winningVote = _vote;
        }
        proposal.voters[_voter] = Voter({
            reputation: rep,
            vote: _vote,
            preBoosted:((proposal.state == ProposalState.PreBoosted) || (proposal.state == ProposalState.Queued))
        });
        if ((proposal.state == ProposalState.PreBoosted) || (proposal.state == ProposalState.Queued)) {
            proposal.preBoostedVotes[_vote] = rep.add(proposal.preBoostedVotes[_vote]);
            uint256 reputationDeposit = (params.votersReputationLossRatio.mul(rep))/100;
            VotingMachineCallbacksInterface(proposal.callbacks).burnReputation(reputationDeposit, _voter, _proposalId);
        }
        emit VoteProposal(_proposalId, organizations[proposal.organizationId], _voter, _vote, rep);
        return _execute(_proposalId);
    }

    /**
     * @dev _score return the proposal score (Confidence level)
     * For dual choice proposal S = (S+)/(S-)
     * @param _proposalId the ID of the proposal
     * @return uint256 proposal score as real number.
     */
    function _score(bytes32 _proposalId) internal view returns(uint256) {
        Proposal storage proposal = proposals[_proposalId];
        //proposal.stakes[NO] cannot be zero as the dao downstake > 0 for each proposal.
        return uint216(proposal.stakes[YES]).fraction(uint216(proposal.stakes[NO]));
    }

    /**
      * @dev _isVotable check if the proposal is votable
      * @param _proposalId the ID of the proposal
      * @return bool true or false
    */
    function _isVotable(bytes32 _proposalId) internal view returns(bool) {
        ProposalState pState = proposals[_proposalId].state;
        return ((pState == ProposalState.PreBoosted)||
                (pState == ProposalState.Boosted)||
                (pState == ProposalState.QuietEndingPeriod)||
                (pState == ProposalState.Queued)
        );
    }
}

// File: @daostack/infra/contracts/votingMachines/GenesisProtocol.sol

pragma solidity ^0.5.4;




/**
 * @title GenesisProtocol implementation -an organization's voting machine scheme.
 */
contract GenesisProtocol is IntVoteInterface, GenesisProtocolLogic {
    using ECDSA for bytes32;

    // Digest describing the data the user signs according EIP 712.
    // Needs to match what is passed to Metamask.
    bytes32 public constant DELEGATION_HASH_EIP712 =
    keccak256(abi.encodePacked(
    "address GenesisProtocolAddress",
    "bytes32 ProposalId",
    "uint256 Vote",
    "uint256 AmountToStake",
    "uint256 Nonce"
    ));

    mapping(address=>uint256) public stakesNonce; //stakes Nonce

    /**
     * @dev Constructor
     */
    constructor(IERC20 _stakingToken)
    public
    // solhint-disable-next-line no-empty-blocks
    GenesisProtocolLogic(_stakingToken) {
    }

    /**
     * @dev staking function
     * @param _proposalId id of the proposal
     * @param _vote  NO(2) or YES(1).
     * @param _amount the betting amount
     * @return bool true - the proposal has been executed
     *              false - otherwise.
     */
    function stake(bytes32 _proposalId, uint256 _vote, uint256 _amount) external returns(bool) {
        return _stake(_proposalId, _vote, _amount, msg.sender);
    }

    /**
     * @dev stakeWithSignature function
     * @param _proposalId id of the proposal
     * @param _vote  NO(2) or YES(1).
     * @param _amount the betting amount
     * @param _nonce nonce value ,it is part of the signature to ensure that
              a signature can be received only once.
     * @param _signatureType signature type
              1 - for web3.eth.sign
              2 - for eth_signTypedData according to EIP #712.
     * @param _signature  - signed data by the staker
     * @return bool true - the proposal has been executed
     *              false - otherwise.
     */
    function stakeWithSignature(
        bytes32 _proposalId,
        uint256 _vote,
        uint256 _amount,
        uint256 _nonce,
        uint256 _signatureType,
        bytes calldata _signature
        )
        external
        returns(bool)
        {
        // Recreate the digest the user signed
        bytes32 delegationDigest;
        if (_signatureType == 2) {
            delegationDigest = keccak256(
                abi.encodePacked(
                    DELEGATION_HASH_EIP712, keccak256(
                        abi.encodePacked(
                        address(this),
                        _proposalId,
                        _vote,
                        _amount,
                        _nonce)
                    )
                )
            );
        } else {
            delegationDigest = keccak256(
                        abi.encodePacked(
                        address(this),
                        _proposalId,
                        _vote,
                        _amount,
                        _nonce)
                    ).toEthSignedMessageHash();
        }
        address staker = delegationDigest.recover(_signature);
        //a garbage staker address due to wrong signature will revert due to lack of approval and funds.
        require(staker != address(0), "staker address cannot be 0");
        require(stakesNonce[staker] == _nonce);
        stakesNonce[staker] = stakesNonce[staker].add(1);
        return _stake(_proposalId, _vote, _amount, staker);
    }

    /**
     * @dev voting function
     * @param _proposalId id of the proposal
     * @param _vote NO(2) or YES(1).
     * @param _amount the reputation amount to vote with . if _amount == 0 it will use all voter reputation.
     * @param _voter voter address
     * @return bool true - the proposal has been executed
     *              false - otherwise.
     */
    function vote(bytes32 _proposalId, uint256 _vote, uint256 _amount, address _voter)
    external
    votable(_proposalId)
    returns(bool) {
        Proposal storage proposal = proposals[_proposalId];
        Parameters memory params = parameters[proposal.paramsHash];
        address voter;
        if (params.voteOnBehalf != address(0)) {
            require(msg.sender == params.voteOnBehalf);
            voter = _voter;
        } else {
            voter = msg.sender;
        }
        return internalVote(_proposalId, voter, _vote, _amount);
    }

  /**
   * @dev Cancel the vote of the msg.sender.
   * cancel vote is not allow in genesisProtocol so this function doing nothing.
   * This function is here in order to comply to the IntVoteInterface .
   */
    function cancelVote(bytes32 _proposalId) external votable(_proposalId) {
       //this is not allowed
        return;
    }

    /**
      * @dev execute check if the proposal has been decided, and if so, execute the proposal
      * @param _proposalId the id of the proposal
      * @return bool true - the proposal has been executed
      *              false - otherwise.
     */
    function execute(bytes32 _proposalId) external votable(_proposalId) returns(bool) {
        return _execute(_proposalId);
    }

  /**
    * @dev getNumberOfChoices returns the number of choices possible in this proposal
    * @return uint256 that contains number of choices
    */
    function getNumberOfChoices(bytes32) external view returns(uint256) {
        return NUM_OF_CHOICES;
    }

    /**
      * @dev getProposalTimes returns proposals times variables.
      * @param _proposalId id of the proposal
      * @return proposals times array
      */
    function getProposalTimes(bytes32 _proposalId) external view returns(uint[3] memory times) {
        return proposals[_proposalId].times;
    }

    /**
     * @dev voteInfo returns the vote and the amount of reputation of the user committed to this proposal
     * @param _proposalId the ID of the proposal
     * @param _voter the address of the voter
     * @return uint256 vote - the voters vote
     *        uint256 reputation - amount of reputation committed by _voter to _proposalId
     */
    function voteInfo(bytes32 _proposalId, address _voter) external view returns(uint, uint) {
        Voter memory voter = proposals[_proposalId].voters[_voter];
        return (voter.vote, voter.reputation);
    }

    /**
    * @dev voteStatus returns the reputation voted for a proposal for a specific voting choice.
    * @param _proposalId the ID of the proposal
    * @param _choice the index in the
    * @return voted reputation for the given choice
    */
    function voteStatus(bytes32 _proposalId, uint256 _choice) external view returns(uint256) {
        return proposals[_proposalId].votes[_choice];
    }

    /**
    * @dev isVotable check if the proposal is votable
    * @param _proposalId the ID of the proposal
    * @return bool true or false
    */
    function isVotable(bytes32 _proposalId) external view returns(bool) {
        return _isVotable(_proposalId);
    }

    /**
    * @dev proposalStatus return the total votes and stakes for a given proposal
    * @param _proposalId the ID of the proposal
    * @return uint256 preBoostedVotes YES
    * @return uint256 preBoostedVotes NO
    * @return uint256 total stakes YES
    * @return uint256 total stakes NO
    */
    function proposalStatus(bytes32 _proposalId) external view returns(uint256, uint256, uint256, uint256) {
        return (
                proposals[_proposalId].preBoostedVotes[YES],
                proposals[_proposalId].preBoostedVotes[NO],
                proposals[_proposalId].stakes[YES],
                proposals[_proposalId].stakes[NO]
        );
    }

  /**
    * @dev getProposalOrganization return the organizationId for a given proposal
    * @param _proposalId the ID of the proposal
    * @return bytes32 organization identifier
    */
    function getProposalOrganization(bytes32 _proposalId) external view returns(bytes32) {
        return (proposals[_proposalId].organizationId);
    }

    /**
      * @dev getStaker return the vote and stake amount for a given proposal and staker
      * @param _proposalId the ID of the proposal
      * @param _staker staker address
      * @return uint256 vote
      * @return uint256 amount
    */
    function getStaker(bytes32 _proposalId, address _staker) external view returns(uint256, uint256) {
        return (proposals[_proposalId].stakers[_staker].vote, proposals[_proposalId].stakers[_staker].amount);
    }

    /**
      * @dev voteStake return the amount stakes for a given proposal and vote
      * @param _proposalId the ID of the proposal
      * @param _vote vote number
      * @return uint256 stake amount
    */
    function voteStake(bytes32 _proposalId, uint256 _vote) external view returns(uint256) {
        return proposals[_proposalId].stakes[_vote];
    }

  /**
    * @dev voteStake return the winningVote for a given proposal
    * @param _proposalId the ID of the proposal
    * @return uint256 winningVote
    */
    function winningVote(bytes32 _proposalId) external view returns(uint256) {
        return proposals[_proposalId].winningVote;
    }

    /**
      * @dev voteStake return the state for a given proposal
      * @param _proposalId the ID of the proposal
      * @return ProposalState proposal state
    */
    function state(bytes32 _proposalId) external view returns(ProposalState) {
        return proposals[_proposalId].state;
    }

   /**
    * @dev isAbstainAllow returns if the voting machine allow abstain (0)
    * @return bool true or false
    */
    function isAbstainAllow() external pure returns(bool) {
        return false;
    }

    /**
     * @dev getAllowedRangeOfChoices returns the allowed range of choices for a voting machine.
     * @return min - minimum number of choices
               max - maximum number of choices
     */
    function getAllowedRangeOfChoices() external pure returns(uint256 min, uint256 max) {
        return (YES, NO);
    }

    /**
     * @dev score return the proposal score
     * @param _proposalId the ID of the proposal
     * @return uint256 proposal score.
     */
    function score(bytes32 _proposalId) public view returns(uint256) {
        return  _score(_proposalId);
    }
}

// File: contracts/votingMachines/VotingMachineCallbacks.sol

pragma solidity ^0.5.4;




contract VotingMachineCallbacks is VotingMachineCallbacksInterface {

    struct ProposalInfo {
        uint256 blockNumber; // the proposal's block number
        Avatar avatar; // the proposal's avatar
    }

    modifier onlyVotingMachine(bytes32 _proposalId) {
        require(proposalsInfo[msg.sender][_proposalId].avatar != Avatar(address(0)), "only VotingMachine");
        _;
    }

    // VotingMaching  ->  proposalId  ->  ProposalInfo
    mapping(address => mapping(bytes32 => ProposalInfo)) public proposalsInfo;

    function mintReputation(uint256 _amount, address _beneficiary, bytes32 _proposalId)
    external
    onlyVotingMachine(_proposalId)
    returns(bool)
    {
        Avatar avatar = proposalsInfo[msg.sender][_proposalId].avatar;
        if (avatar == Avatar(0)) {
            return false;
        }
        return ControllerInterface(avatar.owner()).mintReputation(_amount, _beneficiary, address(avatar));
    }

    function burnReputation(uint256 _amount, address _beneficiary, bytes32 _proposalId)
    external
    onlyVotingMachine(_proposalId)
    returns(bool)
    {
        Avatar avatar = proposalsInfo[msg.sender][_proposalId].avatar;
        if (avatar == Avatar(0)) {
            return false;
        }
        return ControllerInterface(avatar.owner()).burnReputation(_amount, _beneficiary, address(avatar));
    }

    function stakingTokenTransfer(
        IERC20 _stakingToken,
        address _beneficiary,
        uint256 _amount,
        bytes32 _proposalId)
    external
    onlyVotingMachine(_proposalId)
    returns(bool)
    {
        Avatar avatar = proposalsInfo[msg.sender][_proposalId].avatar;
        if (avatar == Avatar(0)) {
            return false;
        }
        return ControllerInterface(avatar.owner()).externalTokenTransfer(_stakingToken, _beneficiary, _amount, avatar);
    }

    function balanceOfStakingToken(IERC20 _stakingToken, bytes32 _proposalId) external view returns(uint256) {
        Avatar avatar = proposalsInfo[msg.sender][_proposalId].avatar;
        if (proposalsInfo[msg.sender][_proposalId].avatar == Avatar(0)) {
            return 0;
        }
        return _stakingToken.balanceOf(address(avatar));
    }

    function getTotalReputationSupply(bytes32 _proposalId) external view returns(uint256) {
        ProposalInfo memory proposal = proposalsInfo[msg.sender][_proposalId];
        if (proposal.avatar == Avatar(0)) {
            return 0;
        }
        return proposal.avatar.nativeReputation().totalSupplyAt(proposal.blockNumber);
    }

    function reputationOf(address _owner, bytes32 _proposalId) external view returns(uint256) {
        ProposalInfo memory proposal = proposalsInfo[msg.sender][_proposalId];
        if (proposal.avatar == Avatar(0)) {
            return 0;
        }
        return proposal.avatar.nativeReputation().balanceOfAt(_owner, proposal.blockNumber);
    }
}

// File: universalSchemes/ContributionReward.sol

pragma solidity ^0.5.4;






/**
 * @title A scheme for proposing and rewarding contributions to an organization
 * @dev An agent can ask an organization to recognize a contribution and reward
 * him with token, reputation, ether or any combination.
 */

contract ContributionReward is UniversalScheme, VotingMachineCallbacks, ProposalExecuteInterface {
    using SafeMath for uint;

    event NewContributionProposal(
        address indexed _avatar,
        bytes32 indexed _proposalId,
        address indexed _intVoteInterface,
        string _descriptionHash,
        int256 _reputationChange,
        uint[5]  _rewards,
        IERC20 _externalToken,
        address _beneficiary
    );

    event ProposalExecuted(address indexed _avatar, bytes32 indexed _proposalId, int256 _param);

    event RedeemReputation(
        address indexed _avatar,
        bytes32 indexed _proposalId,
        address indexed _beneficiary,
        int256 _amount);

    event RedeemEther(address indexed _avatar,
        bytes32 indexed _proposalId,
        address indexed _beneficiary,
        uint256 _amount);

    event RedeemNativeToken(address indexed _avatar,
        bytes32 indexed _proposalId,
        address indexed _beneficiary,
        uint256 _amount);

    event RedeemExternalToken(address indexed _avatar,
        bytes32 indexed _proposalId,
        address indexed _beneficiary,
        uint256 _amount);

    // A struct holding the data for a contribution proposal
    struct ContributionProposal {
        uint256 nativeTokenReward; // Reward asked in the native token of the organization.
        int256 reputationChange; // Organization reputation reward requested.
        uint256 ethReward;
        IERC20 externalToken;
        uint256 externalTokenReward;
        address payable beneficiary;
        uint256 periodLength;
        uint256 numberOfPeriods;
        uint256 executionTime;
        uint[4] redeemedPeriods;
    }

    // A mapping from the organization (Avatar) address to the saved data of the organization:
    mapping(address=>mapping(bytes32=>ContributionProposal)) public organizationsProposals;

    // A mapping from hashes to parameters (use to store a particular configuration on the controller)
    // A contribution fee can be in the organization token or the scheme token or a combination
    struct Parameters {
      // a fee (in the organization's token) that is to be paid for submitting a contribution
        uint256 orgNativeTokenFee;
        bytes32 voteApproveParams;
        IntVoteInterface intVote;
    }

    // A mapping from hashes to parameters (use to store a particular configuration on the controller)
    mapping(bytes32=>Parameters) public parameters;

    /**
    * @dev execution of proposals, can only be called by the voting machine in which the vote is held.
    * @param _proposalId the ID of the voting in the voting machine
    * @param _param a parameter of the voting result, 1 yes and 2 is no.
    */
    function executeProposal(bytes32 _proposalId, int256 _param) external onlyVotingMachine(_proposalId) returns(bool) {
        ProposalInfo memory proposal = proposalsInfo[msg.sender][_proposalId];
        require(organizationsProposals[address(proposal.avatar)][_proposalId].executionTime == 0);
        require(organizationsProposals[address(proposal.avatar)][_proposalId].beneficiary != address(0));
        // Check if vote was successful:
        if (_param == 1) {
          // solhint-disable-next-line not-rely-on-time
            organizationsProposals[address(proposal.avatar)][_proposalId].executionTime = now;
        }
        emit ProposalExecuted(address(proposal.avatar), _proposalId, _param);
        return true;
    }

    /**
    * @dev hash the parameters, save them if necessary, and return the hash value
    */
    function setParameters(
        uint256 _orgNativeTokenFee,
        bytes32 _voteApproveParams,
        IntVoteInterface _intVote
    ) public returns(bytes32)
    {
        bytes32 paramsHash = getParametersHash(
            _orgNativeTokenFee,
            _voteApproveParams,
            _intVote
        );
        parameters[paramsHash].orgNativeTokenFee = _orgNativeTokenFee;
        parameters[paramsHash].voteApproveParams = _voteApproveParams;
        parameters[paramsHash].intVote = _intVote;
        return paramsHash;
    }

    /**
    * @dev return a hash of the given parameters
    * @param _orgNativeTokenFee the fee for submitting a contribution in organizations native token
    * @param _voteApproveParams parameters for the voting machine used to approve a contribution
    * @param _intVote the voting machine used to approve a contribution
    * @return a hash of the parameters
    */
    // TODO: These fees are messy. Better to have a _fee and _feeToken pair,
    //just as in some other contract (which one?) with some sane default
    function getParametersHash(
        uint256 _orgNativeTokenFee,
        bytes32 _voteApproveParams,
        IntVoteInterface _intVote
    ) public pure returns(bytes32)
    {
        return (keccak256(abi.encodePacked(_voteApproveParams, _orgNativeTokenFee, _intVote)));
    }

    /**
    * @dev Submit a proposal for a reward for a contribution:
    * @param _avatar Avatar of the organization that the contribution was made for
    * @param _descriptionHash A hash of the proposal's description
    * @param _reputationChange - Amount of reputation change requested .Can be negative.
    * @param _rewards rewards array:
    *         rewards[0] - Amount of tokens requested per period
    *         rewards[1] - Amount of ETH requested per period
    *         rewards[2] - Amount of external tokens requested per period
    *         rewards[3] - Period length - if set to zero it allows immediate redeeming after execution.
    *         rewards[4] - Number of periods
    * @param _externalToken Address of external token, if reward is requested there
    * @param _beneficiary Who gets the rewards
    */
    function proposeContributionReward(
        Avatar _avatar,
        string memory _descriptionHash,
        int256 _reputationChange,
        uint[5] memory _rewards,
        IERC20 _externalToken,
        address payable _beneficiary
    )
    public
    returns(bytes32)
    {
        validateProposalParams(_reputationChange, _rewards);
        Parameters memory controllerParams = parameters[getParametersFromController(_avatar)];
        // Pay fees for submitting the contribution:
        if (controllerParams.orgNativeTokenFee > 0) {
            _avatar.nativeToken().transferFrom(msg.sender, address(_avatar), controllerParams.orgNativeTokenFee);
        }

        bytes32 contributionId = controllerParams.intVote.propose(
        2,
        controllerParams.voteApproveParams,
        msg.sender,
        address(_avatar)
        );

        address payable beneficiary = _beneficiary;
        if (beneficiary == address(0)) {
            beneficiary = msg.sender;
        }

        ContributionProposal memory proposal = ContributionProposal({
            nativeTokenReward: _rewards[0],
            reputationChange: _reputationChange,
            ethReward: _rewards[1],
            externalToken: _externalToken,
            externalTokenReward: _rewards[2],
            beneficiary: beneficiary,
            periodLength: _rewards[3],
            numberOfPeriods: _rewards[4],
            executionTime: 0,
            redeemedPeriods:[uint(0), uint(0), uint(0), uint(0)]
        });
        organizationsProposals[address(_avatar)][contributionId] = proposal;

        emit NewContributionProposal(
            address(_avatar),
            contributionId,
            address(controllerParams.intVote),
            _descriptionHash,
            _reputationChange,
            _rewards,
            _externalToken,
            beneficiary
        );

        proposalsInfo[address(controllerParams.intVote)][contributionId] = ProposalInfo({
            blockNumber:block.number,
            avatar:_avatar
        });
        return contributionId;
    }

    /**
    * @dev RedeemReputation reward for proposal
    * @param _proposalId the ID of the voting in the voting machine
    * @param _avatar address of the controller
    * @return reputation the redeemed reputation.
    */
    function redeemReputation(bytes32 _proposalId, Avatar _avatar) public returns(int256 reputation) {

        ContributionProposal memory _proposal = organizationsProposals[address(_avatar)][_proposalId];
        ContributionProposal storage proposal = organizationsProposals[address(_avatar)][_proposalId];
        require(proposal.executionTime != 0);
        uint256 periodsToPay = getPeriodsToPay(_proposalId, address(_avatar), 0);

        //set proposal reward to zero to prevent reentrancy attack.
        proposal.reputationChange = 0;
        reputation = int(periodsToPay) * _proposal.reputationChange;
        if (reputation > 0) {
            require(
            ControllerInterface(
            _avatar.owner()).mintReputation(uint(reputation), _proposal.beneficiary, address(_avatar)));
        } else if (reputation < 0) {
            require(
            ControllerInterface(
            _avatar.owner()).burnReputation(uint(reputation*(-1)), _proposal.beneficiary, address(_avatar)));
        }
        if (reputation != 0) {
            proposal.redeemedPeriods[0] = proposal.redeemedPeriods[0].add(periodsToPay);
            emit RedeemReputation(address(_avatar), _proposalId, _proposal.beneficiary, reputation);
        }
        //restore proposal reward.
        proposal.reputationChange = _proposal.reputationChange;
    }

    /**
    * @dev RedeemNativeToken reward for proposal
    * @param _proposalId the ID of the voting in the voting machine
    * @param _avatar address of the controller
    * @return amount the redeemed nativeToken.
    */
    function redeemNativeToken(bytes32 _proposalId, Avatar _avatar) public returns(uint256 amount) {

        ContributionProposal memory _proposal = organizationsProposals[address(_avatar)][_proposalId];
        ContributionProposal storage proposal = organizationsProposals[address(_avatar)][_proposalId];
        require(proposal.executionTime != 0);
        uint256 periodsToPay = getPeriodsToPay(_proposalId, address(_avatar), 1);
        //set proposal rewards to zero to prevent reentrancy attack.
        proposal.nativeTokenReward = 0;

        amount = periodsToPay.mul(_proposal.nativeTokenReward);
        if (amount > 0) {
            require(ControllerInterface(_avatar.owner()).mintTokens(amount, _proposal.beneficiary, address(_avatar)));
            proposal.redeemedPeriods[1] = proposal.redeemedPeriods[1].add(periodsToPay);
            emit RedeemNativeToken(address(_avatar), _proposalId, _proposal.beneficiary, amount);
        }

        //restore proposal reward.
        proposal.nativeTokenReward = _proposal.nativeTokenReward;
    }

    /**
    * @dev RedeemEther reward for proposal
    * @param _proposalId the ID of the voting in the voting machine
    * @param _avatar address of the controller
    * @return amount ether redeemed amount
    */
    function redeemEther(bytes32 _proposalId, Avatar _avatar) public returns(uint256 amount) {

        ContributionProposal memory _proposal = organizationsProposals[address(_avatar)][_proposalId];
        ContributionProposal storage proposal = organizationsProposals[address(_avatar)][_proposalId];
        require(proposal.executionTime != 0);
        uint256 periodsToPay = getPeriodsToPay(_proposalId, address(_avatar), 2);
        //set proposal rewards to zero to prevent reentrancy attack.
        proposal.ethReward = 0;
        amount = periodsToPay.mul(_proposal.ethReward);

        if (amount > 0) {
            require(ControllerInterface(_avatar.owner()).sendEther(amount, _proposal.beneficiary, _avatar));
            proposal.redeemedPeriods[2] = proposal.redeemedPeriods[2].add(periodsToPay);
            emit RedeemEther(address(_avatar), _proposalId, _proposal.beneficiary, amount);
        }

        //restore proposal reward.
        proposal.ethReward = _proposal.ethReward;
    }

    /**
    * @dev RedeemNativeToken reward for proposal
    * @param _proposalId the ID of the voting in the voting machine
    * @param _avatar address of the controller
    * @return amount the external token redeemed amount
    */
    function redeemExternalToken(bytes32 _proposalId, Avatar _avatar) public returns(uint256 amount) {

        ContributionProposal memory _proposal = organizationsProposals[address(_avatar)][_proposalId];
        ContributionProposal storage proposal = organizationsProposals[address(_avatar)][_proposalId];
        require(proposal.executionTime != 0);
        uint256 periodsToPay = getPeriodsToPay(_proposalId, address(_avatar), 3);
        //set proposal rewards to zero to prevent reentrancy attack.
        proposal.externalTokenReward = 0;

        if (proposal.externalToken != IERC20(0) && _proposal.externalTokenReward > 0) {
            amount = periodsToPay.mul(_proposal.externalTokenReward);
            if (amount > 0) {
                require(
                ControllerInterface(
                _avatar.owner())
                .externalTokenTransfer(_proposal.externalToken, _proposal.beneficiary, amount, _avatar));
                proposal.redeemedPeriods[3] = proposal.redeemedPeriods[3].add(periodsToPay);
                emit RedeemExternalToken(address(_avatar), _proposalId, _proposal.beneficiary, amount);
            }
        }
        //restore proposal reward.
        proposal.externalTokenReward = _proposal.externalTokenReward;
    }

    /**
    * @dev redeem rewards for proposal
    * @param _proposalId the ID of the voting in the voting machine
    * @param _avatar address of the controller
    * @param _whatToRedeem whatToRedeem array:
    *         whatToRedeem[0] - reputation
    *         whatToRedeem[1] - nativeTokenReward
    *         whatToRedeem[2] - Ether
    *         whatToRedeem[3] - ExternalToken
    * @return  result boolean array for each redeem type.
    */
    function redeem(bytes32 _proposalId, Avatar _avatar, bool[4] memory _whatToRedeem)
    public
    returns(int256 reputationReward, uint256 nativeTokenReward, uint256 etherReward, uint256 externalTokenReward)
    {

        if (_whatToRedeem[0]) {
            reputationReward = redeemReputation(_proposalId, _avatar);
        }

        if (_whatToRedeem[1]) {
            nativeTokenReward = redeemNativeToken(_proposalId, _avatar);
        }

        if (_whatToRedeem[2]) {
            etherReward = redeemEther(_proposalId, _avatar);
        }

        if (_whatToRedeem[3]) {
            externalTokenReward = redeemExternalToken(_proposalId, _avatar);
        }
    }

    /**
    * @dev getPeriodsToPay return the periods left to be paid for reputation,nativeToken,ether or externalToken.
    * The function ignore the reward amount to be paid (which can be zero).
    * @param _proposalId the ID of the voting in the voting machine
    * @param _avatar address of the controller
    * @param _redeemType - the type of the reward  :
    *         0 - reputation
    *         1 - nativeTokenReward
    *         2 - Ether
    *         3 - ExternalToken
    * @return  periods left to be paid.
    */
    function getPeriodsToPay(bytes32 _proposalId, address _avatar, uint256 _redeemType) public view returns (uint256) {
        require(_redeemType <= 3, "should be in the redeemedPeriods range");
        ContributionProposal memory _proposal = organizationsProposals[_avatar][_proposalId];
        if (_proposal.executionTime == 0)
            return 0;
        uint256 periodsFromExecution;
        if (_proposal.periodLength > 0) {
          // solhint-disable-next-line not-rely-on-time
            periodsFromExecution = (now.sub(_proposal.executionTime))/(_proposal.periodLength);
        }
        uint256 periodsToPay;
        if ((_proposal.periodLength == 0) || (periodsFromExecution >= _proposal.numberOfPeriods)) {
            periodsToPay = _proposal.numberOfPeriods.sub(_proposal.redeemedPeriods[_redeemType]);
        } else {
            periodsToPay = periodsFromExecution.sub(_proposal.redeemedPeriods[_redeemType]);
        }
        return periodsToPay;
    }

    /**
    * @dev getRedeemedPeriods return the already redeemed periods for reputation, nativeToken, ether or externalToken.
    * @param _proposalId the ID of the voting in the voting machine
    * @param _avatar address of the controller
    * @param _redeemType - the type of the reward  :
    *         0 - reputation
    *         1 - nativeTokenReward
    *         2 - Ether
    *         3 - ExternalToken
    * @return redeemed period.
    */
    function getRedeemedPeriods(bytes32 _proposalId, address _avatar, uint256 _redeemType)
    public
    view
    returns (uint256) {
        return organizationsProposals[_avatar][_proposalId].redeemedPeriods[_redeemType];
    }

    function getProposalEthReward(bytes32 _proposalId, address _avatar) public view returns (uint256) {
        return organizationsProposals[_avatar][_proposalId].ethReward;
    }

    function getProposalExternalTokenReward(bytes32 _proposalId, address _avatar) public view returns (uint256) {
        return organizationsProposals[_avatar][_proposalId].externalTokenReward;
    }

    function getProposalExternalToken(bytes32 _proposalId, address _avatar) public view returns (address) {
        return address(organizationsProposals[_avatar][_proposalId].externalToken);
    }

    function getProposalExecutionTime(bytes32 _proposalId, address _avatar) public view returns (uint256) {
        return organizationsProposals[_avatar][_proposalId].executionTime;
    }

    /**
    * @dev validateProposalParams validate proposal's rewards parameters.
    * The function check for potential overflow upon proposal's redeem.
    * The function reverts if the params are not valid.
    * @param _reputationChange - Amount of reputation change requested .Can be negative.
    * @param _rewards rewards array:
    *         rewards[0] - Amount of tokens requested per period
    *         rewards[1] - Amount of ETH requested per period
    *         rewards[2] - Amount of external tokens requested per period
    *         rewards[3] - Period length - if set to zero it allows immediate redeeming after execution.
    *         rewards[4] - Number of periods
    */
    function validateProposalParams(int256 _reputationChange, uint[5] memory _rewards) private pure {
        require(((_rewards[3] > 0) || (_rewards[4] == 1)), "periodLength equal 0 require numberOfPeriods to be 1");
        if (_rewards[4] > 0) {
            // This is the only case of overflow not detected by the check below
            require(!(int(_rewards[4]) == -1 && _reputationChange == (-2**255)),
            "numberOfPeriods * _reputationChange will overflow");
           //check that numberOfPeriods * _reputationChange will not overflow
            require((int(_rewards[4]) * _reputationChange) / int(_rewards[4]) == _reputationChange,
            "numberOfPeriods * reputationChange will overflow");
            //check that numberOfPeriods * tokenReward will not overflow
            require((_rewards[4] * _rewards[0]) / _rewards[4] == _rewards[0],
            "numberOfPeriods * tokenReward will overflow");
            //check that numberOfPeriods * ethReward will not overflow
            require((_rewards[4] * _rewards[1]) / _rewards[4] == _rewards[1],
            "numberOfPeriods * ethReward will overflow");
            //check that numberOfPeriods * texternalTokenReward will not overflow
            require((_rewards[4] * _rewards[2]) / _rewards[4] == _rewards[2],
            "numberOfPeriods * texternalTokenReward will overflow");
        }
    }

}