pragma solidity ^0.5.2;

// File: openzeppelin-solidity/contracts/cryptography/ECDSA.sol

/**
 * @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: /Users/oren/daostack/daostack2/infra/contracts/votingMachines/IntVoteInterface.sol

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: /Users/oren/daostack/daostack2/infra/contracts/libs/RealMath.sol

/**
 * RealMath: fixed-point math library, based on fractional and integer parts.
 * Using uint256 as real216x40, which isn't in Solidity yet.
 * 40 fractional bits gets us down to 1E-12 precision, while still letting us
 * go up to galaxy scale counting in meters.
 * 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;
            // Do the squaring
            tempRealBase = mul(tempRealBase, tempRealBase);
        }

        // Return the final result.
        return uint216(realResult / REAL_ONE);
    }

    /**
     * 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.
        return uint256((uint256(realA) * uint256(realB)) >> 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: openzeppelin-solidity/contracts/token/ERC20/IERC20.sol

/**
 * @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: /Users/oren/daostack/daostack2/infra/contracts/votingMachines/VotingMachineCallbacksInterface.sol

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: /Users/oren/daostack/daostack2/infra/contracts/votingMachines/ProposalExecuteInterface.sol

interface ProposalExecuteInterface {
    function executeProposal(bytes32 _proposalId, int _decision) external returns(bool);
}

// File: openzeppelin-solidity/contracts/math/SafeMath.sol

/**
 * @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/math/Math.sol

/**
 * @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: openzeppelin-solidity/contracts/utils/Address.sol

/**
 * 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: /Users/oren/daostack/daostack2/infra/contracts/votingMachines/GenesisProtocolLogic.sol

/**
 * @title GenesisProtocol implementation -an organization's voting machine scheme.
 */
contract GenesisProtocolLogic is IntVoteInterface {
    using SafeMath for uint;
    using Math for uint;
    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;
        //      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);

    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
        Staker storage staker = proposals[proposalId].stakers[organizations[proposal.organizationId]];
        staker.vote = NO;
        staker.amount = proposal.daoBountyRemain;

        emit NewProposal(proposalId, organizations[proposal.organizationId], NUM_OF_CHOICES, _proposer, _paramsHash);
        return proposalId;
    }

    /**
      * @dev executeBoosted try to execute a boosted 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);
        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];
        if (staker.amount > 0) {
            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) {
                uint256 totalWinningStakes = proposal.stakes[proposal.winningVote];
                uint256 totalStakes = proposal.stakes[YES].add(proposal.stakes[NO]);
                if (staker.vote == YES) {
                    uint256 _totalStakes =
                    ((totalStakes.mul(100 - proposal.expirationCallBountyPercentage))/100) - proposal.daoBounty;
                    rewards[0] = (staker.amount.mul(_totalStakes))/totalWinningStakes;
                } else {
                    rewards[0] = (staker.amount.mul(totalStakes))/totalWinningStakes;
                    if (organizations[proposal.organizationId] == _beneficiary) {
                          //dao redeem it reward
                        rewards[0] = rewards[0].sub(proposal.daoBounty);
                    }
                }
            }
            staker.amount = 0;
        }
        //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) {
                uint256 preBoostedVotes = proposal.preBoostedVotes[YES].add(proposal.preBoostedVotes[NO]);
                rewards[1] = ((voter.reputation.mul(params.votersReputationLossRatio))/100)
                .add((voter.reputation.mul(lostReputation))/preBoostedVotes);
            }
            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.
     */
    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;
                    }
                }
            }
        }

        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.
     */
    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 proposal.stakes[YES]/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: contracts/votingMachines/GenesisProtocol.sol

/**
 * @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);
    }
}