contract ManagedAccountInterface {
    // The only address with permission to withdraw from this account
    address public owner;
    // If true, only the owner of the account can receive ether from it
    bool public payOwnerOnly;
    // The sum of ether (in wei) which has been sent to this contract
    uint public accumulatedInput;

    /// @notice Sends `_amount` of wei to _recipient
    /// @param _amount The amount of wei to send to `_recipient`
    /// @param _recipient The address to receive `_amount` of wei
    /// @return True if the send completed
    function payOut(address _recipient, uint _amount) returns (bool);

    event PayOut(address indexed _recipient, uint _amount);
}


contract ManagedAccount is ManagedAccountInterface{

    // The constructor sets the owner of the account
    function ManagedAccount(address _owner, bool _payOwnerOnly) {
        owner = _owner;
        payOwnerOnly = _payOwnerOnly;
    }

    // When the contract receives a transaction without data this is called.
    // It counts the amount of ether it receives and stores it in
    // accumulatedInput.
    function() {
        accumulatedInput += msg.value;
    }

    function payOut(address _recipient, uint _amount) returns (bool) {
        if (msg.sender != owner || msg.value > 0 || (payOwnerOnly && _recipient != owner))
            throw;
        if (_recipient.call.value(_amount)()) {
            PayOut(_recipient, _amount);
            return true;
        } else {
            return false;
        }
    }
}

contract TokenInterface {
    mapping (address => uint256) balances;
    mapping (address => mapping (address => uint256)) allowed;

    /// Total amount of tokens
    uint256 public totalSupply;

    /// @param _owner The address from which the balance will be retrieved
    /// @return The balance
    function balanceOf(address _owner) constant returns (uint256 balance);

    /// @notice Send `_amount` tokens to `_to` from `msg.sender`
    /// @param _to The address of the recipient
    /// @param _amount The amount of tokens to be transferred
    /// @return Whether the transfer was successful or not
    function transfer(address _to, uint256 _amount) returns (bool success);

    /// @notice Send `_amount` tokens to `_to` from `_from` on the condition it
    /// is approved by `_from`
    /// @param _from The address of the origin of the transfer
    /// @param _to The address of the recipient
    /// @param _amount The amount of tokens to be transferred
    /// @return Whether the transfer was successful or not
    function transferFrom(address _from, address _to, uint256 _amount) returns (bool success);

    /// @notice `msg.sender` approves `_spender` to spend `_amount` tokens on
    /// its behalf
    /// @param _spender The address of the account able to transfer the tokens
    /// @param _amount The amount of tokens to be approved for transfer
    /// @return Whether the approval was successful or not
    function approve(address _spender, uint256 _amount) returns (bool success);

    /// @param _owner The address of the account owning tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @return Amount of remaining tokens of _owner that _spender is allowed
    /// to spend
    function allowance(
        address _owner,
        address _spender
    ) constant returns (uint256 remaining);

    event Transfer(address indexed _from, address indexed _to, uint256 _amount);
    event Approval(
        address indexed _owner,
        address indexed _spender,
        uint256 _amount
    );
}


contract Token is TokenInterface {
    // Protects users by preventing the execution of method calls that
    // inadvertently also transferred ether
    modifier noEther() {if (msg.value > 0) throw; _}

    function balanceOf(address _owner) constant returns (uint256 balance) {
        return balances[_owner];
    }

    function transfer(address _to, uint256 _amount) noEther returns (bool success) {
        if (balances[msg.sender] >= _amount && _amount > 0) {
            balances[msg.sender] -= _amount;
            balances[_to] += _amount;
            Transfer(msg.sender, _to, _amount);
            return true;
        } else {
           return false;
        }
    }

    function transferFrom(
        address _from,
        address _to,
        uint256 _amount
    ) noEther returns (bool success) {

        if (balances[_from] >= _amount
            && allowed[_from][msg.sender] >= _amount
            && _amount > 0) {

            balances[_to] += _amount;
            balances[_from] -= _amount;
            allowed[_from][msg.sender] -= _amount;
            Transfer(_from, _to, _amount);
            return true;
        } else {
            return false;
        }
    }

    function approve(address _spender, uint256 _amount) returns (bool success) {
        allowed[msg.sender][_spender] = _amount;
        Approval(msg.sender, _spender, _amount);
        return true;
    }

    function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
        return allowed[_owner][_spender];
    }
}

contract TokenCreationInterface {

    // End of token creation, in Unix time
    uint public closingTime;
    // Minimum fueling goal of the token creation, denominated in tokens to
    // be created
    uint public minTokensToCreate;
    // True if the DAO reached its minimum fueling goal, false otherwise
    bool public isFueled;
    // For DAO splits - if privateCreation is 0, then it is a public token
    // creation, otherwise only the address stored in privateCreation is
    // allowed to create tokens
    address public privateCreation;
    // hold extra ether which has been sent after the DAO token
    // creation rate has increased
    ManagedAccount public extraBalance;
    // tracks the amount of wei given from each contributor (used for refund)
    mapping (address => uint256) weiGiven;

    /// @dev Constructor setting the minimum fueling goal and the
    /// end of the Token Creation
    /// @param _minTokensToCreate Minimum fueling goal in number of
    ///        Tokens to be created
    /// @param _closingTime Date (in Unix time) of the end of the Token Creation
    /// @param _privateCreation Zero means that the creation is public.  A
    /// non-zero address represents the only address that can create Tokens
    /// (the address can also create Tokens on behalf of other accounts)
    // This is the constructor: it can not be overloaded so it is commented out
    //  function TokenCreation(
        //  uint _minTokensTocreate,
        //  uint _closingTime,
        //  address _privateCreation
    //  );

    /// @notice Create Token with `_tokenHolder` as the initial owner of the Token
    /// @param _tokenHolder The address of the Tokens's recipient
    /// @return Whether the token creation was successful
    function createTokenProxy(address _tokenHolder) returns (bool success);

    /// @notice Refund `msg.sender` in the case the Token Creation did
    /// not reach its minimum fueling goal
    function refund();

    /// @return The divisor used to calculate the token creation rate during
    /// the creation phase
    function divisor() constant returns (uint divisor);

    event FuelingToDate(uint value);
    event CreatedToken(address indexed to, uint amount);
    event Refund(address indexed to, uint value);
}


contract TokenCreation is TokenCreationInterface, Token {
    function TokenCreation(
        uint _minTokensToCreate,
        uint _closingTime,
        address _privateCreation) {

        closingTime = _closingTime;
        minTokensToCreate = _minTokensToCreate;
        privateCreation = _privateCreation;
        extraBalance = new ManagedAccount(address(this), true);
    }

    function createTokenProxy(address _tokenHolder) returns (bool success) {
        if (now < closingTime && msg.value > 0
            && (privateCreation == 0 || privateCreation == msg.sender)) {

            uint token = (msg.value * 20) / divisor();
            extraBalance.call.value(msg.value - token)();
            balances[_tokenHolder] += token;
            totalSupply += token;
            weiGiven[_tokenHolder] += msg.value;
            CreatedToken(_tokenHolder, token);
            if (totalSupply >= minTokensToCreate && !isFueled) {
                isFueled = true;
                FuelingToDate(totalSupply);
            }
            return true;
        }
        throw;
    }

    function refund() noEther {
        if (now > closingTime && !isFueled) {
            // Get extraBalance - will only succeed when called for the first time
            if (extraBalance.balance >= extraBalance.accumulatedInput())
                extraBalance.payOut(address(this), extraBalance.accumulatedInput());

            // Execute refund
            if (msg.sender.call.value(weiGiven[msg.sender])()) {
                Refund(msg.sender, weiGiven[msg.sender]);
                totalSupply -= balances[msg.sender];
                balances[msg.sender] = 0;
                weiGiven[msg.sender] = 0;
            }
        }
    }

    function divisor() constant returns (uint divisor) {
        // The number of (base unit) tokens per wei is calculated
        // as `msg.value` * 20 / `divisor`
        // The fueling period starts with a 1:1 ratio
        if (closingTime - 2 weeks > now) {
            return 20;
        // Followed by 10 days with a daily creation rate increase of 5%
        } else if (closingTime - 4 days > now) {
            return (20 + (now - (closingTime - 2 weeks)) / (1 days));
        // The last 4 days there is a constant creation rate ratio of 1:1.5
        } else {
            return 30;
        }
    }
}

contract DAOInterface {

    // The amount of days for which people who try to participate in the
    // creation by calling the fallback function will still get their ether back
    uint constant creationGracePeriod = 40 days;
    // The minimum debate period that a generic proposal can have
    uint constant minProposalDebatePeriod = 2 weeks;
    // The minimum debate period that a split proposal can have
    uint constant minSplitDebatePeriod = 1 weeks;
    // Period of days inside which it's possible to execute a DAO split
    uint constant splitExecutionPeriod = 27 days;
    // Period of time after which the minimum Quorum is halved
    uint constant quorumHalvingPeriod = 25 weeks;
    // Period after which a proposal is closed
    // (used in the case `executeProposal` fails because it throws)
    uint constant executeProposalPeriod = 10 days;
    // Denotes the maximum proposal deposit that can be given. It is given as
    // a fraction of total Ether spent plus balance of the DAO
    uint constant maxDepositDivisor = 100;

    // Proposals to spend the DAO's ether or to choose a new Curator
    Proposal[] public proposals;
    // The quorum needed for each proposal is partially calculated by
    // totalSupply / minQuorumDivisor
    uint public minQuorumDivisor;
    // The unix time of the last time quorum was reached on a proposal
    uint  public lastTimeMinQuorumMet;

    // Address of the curator
    address public curator;
    // The whitelist: List of addresses the DAO is allowed to send ether to
    mapping (address => bool) public allowedRecipients;

    // Tracks the addresses that own Reward Tokens. Those addresses can only be
    // DAOs that have split from the original DAO. Conceptually, Reward Tokens
    // represent the proportion of the rewards that the DAO has the right to
    // receive. These Reward Tokens are generated when the DAO spends ether.
    mapping (address => uint) public rewardToken;
    // Total supply of rewardToken
    uint public totalRewardToken;

    // The account used to manage the rewards which are to be distributed to the
    // DAO Token Holders of this DAO
    ManagedAccount public rewardAccount;

    // The account used to manage the rewards which are to be distributed to
    // any DAO that holds Reward Tokens
    ManagedAccount public DAOrewardAccount;

    // Amount of rewards (in wei) already paid out to a certain DAO
    mapping (address => uint) public DAOpaidOut;

    // Amount of rewards (in wei) already paid out to a certain address
    mapping (address => uint) public paidOut;
    // Map of addresses blocked during a vote (not allowed to transfer DAO
    // tokens). The address points to the proposal ID.
    mapping (address => uint) public blocked;

    // The minimum deposit (in wei) required to submit any proposal that is not
    // requesting a new Curator (no deposit is required for splits)
    uint public proposalDeposit;

    // the accumulated sum of all current proposal deposits
    uint sumOfProposalDeposits;

    // Contract that is able to create a new DAO (with the same code as
    // this one), used for splits
    DAO_Creator public daoCreator;

    // A proposal with `newCurator == false` represents a transaction
    // to be issued by this DAO
    // A proposal with `newCurator == true` represents a DAO split
    struct Proposal {
        // The address where the `amount` will go to if the proposal is accepted
        // or if `newCurator` is true, the proposed Curator of
        // the new DAO).
        address recipient;
        // The amount to transfer to `recipient` if the proposal is accepted.
        uint amount;
        // A plain text description of the proposal
        string description;
        // A unix timestamp, denoting the end of the voting period
        uint votingDeadline;
        // True if the proposal's votes have yet to be counted, otherwise False
        bool open;
        // True if quorum has been reached, the votes have been counted, and
        // the majority said yes
        bool proposalPassed;
        // A hash to check validity of a proposal
        bytes32 proposalHash;
        // Deposit in wei the creator added when submitting their proposal. It
        // is taken from the msg.value of a newProposal call.
        uint proposalDeposit;
        // True if this proposal is to assign a new Curator
        bool newCurator;
        // Data needed for splitting the DAO
        SplitData[] splitData;
        // Number of Tokens in favor of the proposal
        uint yea;
        // Number of Tokens opposed to the proposal
        uint nay;
        // Simple mapping to check if a shareholder has voted for it
        mapping (address => bool) votedYes;
        // Simple mapping to check if a shareholder has voted against it
        mapping (address => bool) votedNo;
        // Address of the shareholder who created the proposal
        address creator;
    }

    // Used only in the case of a newCurator proposal.
    struct SplitData {
        // The balance of the current DAO minus the deposit at the time of split
        uint splitBalance;
        // The total amount of DAO Tokens in existence at the time of split.
        uint totalSupply;
        // Amount of Reward Tokens owned by the DAO at the time of split.
        uint rewardToken;
        // The new DAO contract created at the time of split.
        DAO newDAO;
    }

    // Used to restrict access to certain functions to only DAO Token Holders
    modifier onlyTokenholders {}

    /// @dev Constructor setting the Curator and the address
    /// for the contract able to create another DAO as well as the parameters
    /// for the DAO Token Creation
    /// @param _curator The Curator
    /// @param _daoCreator The contract able to (re)create this DAO
    /// @param _proposalDeposit The deposit to be paid for a regular proposal
    /// @param _minTokensToCreate Minimum required wei-equivalent tokens
    ///        to be created for a successful DAO Token Creation
    /// @param _closingTime Date (in Unix time) of the end of the DAO Token Creation
    /// @param _privateCreation If zero the DAO Token Creation is open to public, a
    /// non-zero address means that the DAO Token Creation is only for the address
    // This is the constructor: it can not be overloaded so it is commented out
    //  function DAO(
        //  address _curator,
        //  DAO_Creator _daoCreator,
        //  uint _proposalDeposit,
        //  uint _minTokensToCreate,
        //  uint _closingTime,
        //  address _privateCreation
    //  );

    /// @notice Create Token with `msg.sender` as the beneficiary
    /// @return Whether the token creation was successful
    function () returns (bool success);


    /// @dev This function is used to send ether back
    /// to the DAO, it can also be used to receive payments that should not be
    /// counted as rewards (donations, grants, etc.)
    /// @return Whether the DAO received the ether successfully
    function receiveEther() returns(bool);

    /// @notice `msg.sender` creates a proposal to send `_amount` Wei to
    /// `_recipient` with the transaction data `_transactionData`. If
    /// `_newCurator` is true, then this is a proposal that splits the
    /// DAO and sets `_recipient` as the new DAO's Curator.
    /// @param _recipient Address of the recipient of the proposed transaction
    /// @param _amount Amount of wei to be sent with the proposed transaction
    /// @param _description String describing the proposal
    /// @param _transactionData Data of the proposed transaction
    /// @param _debatingPeriod Time used for debating a proposal, at least 2
    /// weeks for a regular proposal, 10 days for new Curator proposal
    /// @param _newCurator Bool defining whether this proposal is about
    /// a new Curator or not
    /// @return The proposal ID. Needed for voting on the proposal
    function newProposal(
        address _recipient,
        uint _amount,
        string _description,
        bytes _transactionData,
        uint _debatingPeriod,
        bool _newCurator
    ) onlyTokenholders returns (uint _proposalID);

    /// @notice Check that the proposal with the ID `_proposalID` matches the
    /// transaction which sends `_amount` with data `_transactionData`
    /// to `_recipient`
    /// @param _proposalID The proposal ID
    /// @param _recipient The recipient of the proposed transaction
    /// @param _amount The amount of wei to be sent in the proposed transaction
    /// @param _transactionData The data of the proposed transaction
    /// @return Whether the proposal ID matches the transaction data or not
    function checkProposalCode(
        uint _proposalID,
        address _recipient,
        uint _amount,
        bytes _transactionData
    ) constant returns (bool _codeChecksOut);

    /// @notice Vote on proposal `_proposalID` with `_supportsProposal`
    /// @param _proposalID The proposal ID
    /// @param _supportsProposal Yes/No - support of the proposal
    /// @return The vote ID.
    function vote(
        uint _proposalID,
        bool _supportsProposal
    ) onlyTokenholders returns (uint _voteID);

    /// @notice Checks whether proposal `_proposalID` with transaction data
    /// `_transactionData` has been voted for or rejected, and executes the
    /// transaction in the case it has been voted for.
    /// @param _proposalID The proposal ID
    /// @param _transactionData The data of the proposed transaction
    /// @return Whether the proposed transaction has been executed or not
    function executeProposal(
        uint _proposalID,
        bytes _transactionData
    ) returns (bool _success);

    /// @notice ATTENTION! I confirm to move my remaining ether to a new DAO
    /// with `_newCurator` as the new Curator, as has been
    /// proposed in proposal `_proposalID`. This will burn my tokens. This can
    /// not be undone and will split the DAO into two DAO's, with two
    /// different underlying tokens.
    /// @param _proposalID The proposal ID
    /// @param _newCurator The new Curator of the new DAO
    /// @dev This function, when called for the first time for this proposal,
    /// will create a new DAO and send the sender's portion of the remaining
    /// ether and Reward Tokens to the new DAO. It will also burn the DAO Tokens
    /// of the sender.
    function splitDAO(
        uint _proposalID,
        address _newCurator
    ) returns (bool _success);

    /// @dev can only be called by the DAO itself through a proposal
    /// updates the contract of the DAO by sending all ether and rewardTokens
    /// to the new DAO. The new DAO needs to be approved by the Curator
    /// @param _newContract the address of the new contract
    function newContract(address _newContract);


    /// @notice Add a new possible recipient `_recipient` to the whitelist so
    /// that the DAO can send transactions to them (using proposals)
    /// @param _recipient New recipient address
    /// @dev Can only be called by the current Curator
    /// @return Whether successful or not
    function changeAllowedRecipients(address _recipient, bool _allowed) external returns (bool _success);


    /// @notice Change the minimum deposit required to submit a proposal
    /// @param _proposalDeposit The new proposal deposit
    /// @dev Can only be called by this DAO (through proposals with the
    /// recipient being this DAO itself)
    function changeProposalDeposit(uint _proposalDeposit) external;

    /// @notice Move rewards from the DAORewards managed account
    /// @param _toMembers If true rewards are moved to the actual reward account
    ///                   for the DAO. If not then it's moved to the DAO itself
    /// @return Whether the call was successful
    function retrieveDAOReward(bool _toMembers) external returns (bool _success);

    /// @notice Get my portion of the reward that was sent to `rewardAccount`
    /// @return Whether the call was successful
    function getMyReward() returns(bool _success);

    /// @notice Withdraw `_account`'s portion of the reward from `rewardAccount`
    /// to `_account`'s balance
    /// @return Whether the call was successful
    function withdrawRewardFor(address _account) internal returns (bool _success);

    /// @notice Send `_amount` tokens to `_to` from `msg.sender`. Prior to this
    /// getMyReward() is called.
    /// @param _to The address of the recipient
    /// @param _amount The amount of tokens to be transfered
    /// @return Whether the transfer was successful or not
    function transferWithoutReward(address _to, uint256 _amount) returns (bool success);

    /// @notice Send `_amount` tokens to `_to` from `_from` on the condition it
    /// is approved by `_from`. Prior to this getMyReward() is called.
    /// @param _from The address of the sender
    /// @param _to The address of the recipient
    /// @param _amount The amount of tokens to be transfered
    /// @return Whether the transfer was successful or not
    function transferFromWithoutReward(
        address _from,
        address _to,
        uint256 _amount
    ) returns (bool success);

    /// @notice Doubles the 'minQuorumDivisor' in the case quorum has not been
    /// achieved in 52 weeks
    /// @return Whether the change was successful or not
    function halveMinQuorum() returns (bool _success);

    /// @return total number of proposals ever created
    function numberOfProposals() constant returns (uint _numberOfProposals);

    /// @param _proposalID Id of the new curator proposal
    /// @return Address of the new DAO
    function getNewDAOAddress(uint _proposalID) constant returns (address _newDAO);

    /// @param _account The address of the account which is checked.
    /// @return Whether the account is blocked (not allowed to transfer tokens) or not.
    function isBlocked(address _account) internal returns (bool);

    /// @notice If the caller is blocked by a proposal whose voting deadline
    /// has exprired then unblock him.
    /// @return Whether the account is blocked (not allowed to transfer tokens) or not.
    function unblockMe() returns (bool);

    event ProposalAdded(
        uint indexed proposalID,
        address recipient,
        uint amount,
        bool newCurator,
        string description
    );
    event Voted(uint indexed proposalID, bool position, address indexed voter);
    event ProposalTallied(uint indexed proposalID, bool result, uint quorum);
    event NewCurator(address indexed _newCurator);
    event AllowedRecipientChanged(address indexed _recipient, bool _allowed);
}

// The DAO contract itself
contract DAO is DAOInterface, Token, TokenCreation {

    // Modifier that allows only shareholders to vote and create new proposals
    modifier onlyTokenholders {
        if (balanceOf(msg.sender) == 0) throw;
            _
    }

    function DAO(
        address _curator,
        DAO_Creator _daoCreator,
        uint _proposalDeposit,
        uint _minTokensToCreate,
        uint _closingTime,
        address _privateCreation
    ) TokenCreation(_minTokensToCreate, _closingTime, _privateCreation) {

        curator = _curator;
        daoCreator = _daoCreator;
        proposalDeposit = _proposalDeposit;
        rewardAccount = new ManagedAccount(address(this), false);
        DAOrewardAccount = new ManagedAccount(address(this), false);
        if (address(rewardAccount) == 0)
            throw;
        if (address(DAOrewardAccount) == 0)
            throw;
        lastTimeMinQuorumMet = now;
        minQuorumDivisor = 5; // sets the minimal quorum to 20%
        proposals.length = 1; // avoids a proposal with ID 0 because it is used

        allowedRecipients[address(this)] = true;
        allowedRecipients[curator] = true;
    }

    function () returns (bool success) {
        if (now < closingTime + creationGracePeriod && msg.sender != address(extraBalance))
            return createTokenProxy(msg.sender);
        else
            return receiveEther();
    }


    function receiveEther() returns (bool) {
        return true;
    }


    function newProposal(
        address _recipient,
        uint _amount,
        string _description,
        bytes _transactionData,
        uint _debatingPeriod,
        bool _newCurator
    ) onlyTokenholders returns (uint _proposalID) {

        // Sanity check
        if (_newCurator && (
            _amount != 0
            || _transactionData.length != 0
            || _recipient == curator
            || msg.value > 0
            || _debatingPeriod < minSplitDebatePeriod)) {
            throw;
        } else if (
            !_newCurator
            && (!isRecipientAllowed(_recipient) || (_debatingPeriod <  minProposalDebatePeriod))
        ) {
            throw;
        }

        if (_debatingPeriod > 8 weeks)
            throw;

        if (!isFueled
            || now < closingTime
            || (msg.value < proposalDeposit && !_newCurator)) {

            throw;
        }

        if (now + _debatingPeriod < now) // prevents overflow
            throw;

        // to prevent a 51% attacker to convert the ether into deposit
        if (msg.sender == address(this))
            throw;

        _proposalID = proposals.length++;
        Proposal p = proposals[_proposalID];
        p.recipient = _recipient;
        p.amount = _amount;
        p.description = _description;
        p.proposalHash = sha3(_recipient, _amount, _transactionData);
        p.votingDeadline = now + _debatingPeriod;
        p.open = true;
        //p.proposalPassed = False; // that's default
        p.newCurator = _newCurator;
        if (_newCurator)
            p.splitData.length++;
        p.creator = msg.sender;
        p.proposalDeposit = msg.value;

        sumOfProposalDeposits += msg.value;

        ProposalAdded(
            _proposalID,
            _recipient,
            _amount,
            _newCurator,
            _description
        );
    }


    function checkProposalCode(
        uint _proposalID,
        address _recipient,
        uint _amount,
        bytes _transactionData
    ) noEther constant returns (bool _codeChecksOut) {
        Proposal p = proposals[_proposalID];
        return p.proposalHash == sha3(_recipient, _amount, _transactionData);
    }


    function vote(
        uint _proposalID,
        bool _supportsProposal
    ) onlyTokenholders noEther returns (uint _voteID) {

        Proposal p = proposals[_proposalID];
        if (p.votedYes[msg.sender]
            || p.votedNo[msg.sender]
            || now >= p.votingDeadline) {

            throw;
        }

        if (_supportsProposal) {
            p.yea += balances[msg.sender];
            p.votedYes[msg.sender] = true;
        } else {
            p.nay += balances[msg.sender];
            p.votedNo[msg.sender] = true;
        }

        if (blocked[msg.sender] == 0) {
            blocked[msg.sender] = _proposalID;
        } else if (p.votingDeadline > proposals[blocked[msg.sender]].votingDeadline) {
            // this proposal's voting deadline is further into the future than
            // the proposal that blocks the sender so make it the blocker
            blocked[msg.sender] = _proposalID;
        }

        Voted(_proposalID, _supportsProposal, msg.sender);
    }


    function executeProposal(
        uint _proposalID,
        bytes _transactionData
    ) noEther returns (bool _success) {

        Proposal p = proposals[_proposalID];

        uint waitPeriod = p.newCurator
            ? splitExecutionPeriod
            : executeProposalPeriod;
        // If we are over deadline and waiting period, assert proposal is closed
        if (p.open && now > p.votingDeadline + waitPeriod) {
            closeProposal(_proposalID);
            return;
        }

        // Check if the proposal can be executed
        if (now < p.votingDeadline  // has the voting deadline arrived?
            // Have the votes been counted?
            || !p.open
            // Does the transaction code match the proposal?
            || p.proposalHash != sha3(p.recipient, p.amount, _transactionData)) {

            throw;
        }

        // If the curator removed the recipient from the whitelist, close the proposal
        // in order to free the deposit and allow unblocking of voters
        if (!isRecipientAllowed(p.recipient)) {
            closeProposal(_proposalID);
            p.creator.send(p.proposalDeposit);
            return;
        }

        bool proposalCheck = true;

        if (p.amount > actualBalance())
            proposalCheck = false;

        uint quorum = p.yea + p.nay;

        // require 53% for calling newContract()
        if (_transactionData.length >= 4 && _transactionData[0] == 0x68
            && _transactionData[1] == 0x37 && _transactionData[2] == 0xff
            && _transactionData[3] == 0x1e
            && quorum < minQuorum(actualBalance() + rewardToken[address(this)])) {

                proposalCheck = false;
        }

        if (quorum >= minQuorum(p.amount)) {
            if (!p.creator.send(p.proposalDeposit))
                throw;

            lastTimeMinQuorumMet = now;
            // set the minQuorum to 20% again, in the case it has been reached
            if (quorum > totalSupply / 5)
                minQuorumDivisor = 5;
        }

        // Execute result
        if (quorum >= minQuorum(p.amount) && p.yea > p.nay && proposalCheck) {
            if (!p.recipient.call.value(p.amount)(_transactionData))
                throw;

            p.proposalPassed = true;
            _success = true;

            // only create reward tokens when ether is not sent to the DAO itself and
            // related addresses. Proxy addresses should be forbidden by the curator.
            if (p.recipient != address(this) && p.recipient != address(rewardAccount)
                && p.recipient != address(DAOrewardAccount)
                && p.recipient != address(extraBalance)
                && p.recipient != address(curator)) {

                rewardToken[address(this)] += p.amount;
                totalRewardToken += p.amount;
            }
        }

        closeProposal(_proposalID);

        // Initiate event
        ProposalTallied(_proposalID, _success, quorum);
    }


    function closeProposal(uint _proposalID) internal {
        Proposal p = proposals[_proposalID];
        if (p.open)
            sumOfProposalDeposits -= p.proposalDeposit;
        p.open = false;
    }

    function splitDAO(
        uint _proposalID,
        address _newCurator
    ) noEther onlyTokenholders returns (bool _success) {

        Proposal p = proposals[_proposalID];

        // Sanity check

        if (now < p.votingDeadline  // has the voting deadline arrived?
            //The request for a split expires XX days after the voting deadline
            || now > p.votingDeadline + splitExecutionPeriod
            // Does the new Curator address match?
            || p.recipient != _newCurator
            // Is it a new curator proposal?
            || !p.newCurator
            // Have you voted for this split?
            || !p.votedYes[msg.sender]
            // Did you already vote on another proposal?
            || (blocked[msg.sender] != _proposalID && blocked[msg.sender] != 0) )  {

            throw;
        }

        // If the new DAO doesn't exist yet, create the new DAO and store the
        // current split data
        if (address(p.splitData[0].newDAO) == 0) {
            p.splitData[0].newDAO = createNewDAO(_newCurator);
            // Call depth limit reached, etc.
            if (address(p.splitData[0].newDAO) == 0)
                throw;
            // should never happen
            if (this.balance < sumOfProposalDeposits)
                throw;
            p.splitData[0].splitBalance = actualBalance();
            p.splitData[0].rewardToken = rewardToken[address(this)];
            p.splitData[0].totalSupply = totalSupply;
            p.proposalPassed = true;
        }

        // Move ether and assign new Tokens
        uint fundsToBeMoved =
            (balances[msg.sender] * p.splitData[0].splitBalance) /
            p.splitData[0].totalSupply;
        if (p.splitData[0].newDAO.createTokenProxy.value(fundsToBeMoved)(msg.sender) == false)
            throw;


        // Assign reward rights to new DAO
        uint rewardTokenToBeMoved =
            (balances[msg.sender] * p.splitData[0].rewardToken) /
            p.splitData[0].totalSupply;

        uint paidOutToBeMoved = DAOpaidOut[address(this)] * rewardTokenToBeMoved /
            rewardToken[address(this)];

        rewardToken[address(p.splitData[0].newDAO)] += rewardTokenToBeMoved;
        if (rewardToken[address(this)] < rewardTokenToBeMoved)
            throw;
        rewardToken[address(this)] -= rewardTokenToBeMoved;

        DAOpaidOut[address(p.splitData[0].newDAO)] += paidOutToBeMoved;
        if (DAOpaidOut[address(this)] < paidOutToBeMoved)
            throw;
        DAOpaidOut[address(this)] -= paidOutToBeMoved;

        // Burn DAO Tokens
        Transfer(msg.sender, 0, balances[msg.sender]);
        withdrawRewardFor(msg.sender); // be nice, and get his rewards
        totalSupply -= balances[msg.sender];
        balances[msg.sender] = 0;
        paidOut[msg.sender] = 0;
        return true;
    }

    function newContract(address _newContract){
        if (msg.sender != address(this) || !allowedRecipients[_newContract]) return;
        // move all ether
        if (!_newContract.call.value(address(this).balance)()) {
            throw;
        }

        //move all reward tokens
        rewardToken[_newContract] += rewardToken[address(this)];
        rewardToken[address(this)] = 0;
        DAOpaidOut[_newContract] += DAOpaidOut[address(this)];
        DAOpaidOut[address(this)] = 0;
    }


    function retrieveDAOReward(bool _toMembers) external noEther returns (bool _success) {
        DAO dao = DAO(msg.sender);

        if ((rewardToken[msg.sender] * DAOrewardAccount.accumulatedInput()) /
            totalRewardToken < DAOpaidOut[msg.sender])
            throw;

        uint reward =
            (rewardToken[msg.sender] * DAOrewardAccount.accumulatedInput()) /
            totalRewardToken - DAOpaidOut[msg.sender];
        if(_toMembers) {
            if (!DAOrewardAccount.payOut(dao.rewardAccount(), reward))
                throw;
            }
        else {
            if (!DAOrewardAccount.payOut(dao, reward))
                throw;
        }
        DAOpaidOut[msg.sender] += reward;
        return true;
    }

    function getMyReward() noEther returns (bool _success) {
        return withdrawRewardFor(msg.sender);
    }


    function withdrawRewardFor(address _account) noEther internal returns (bool _success) {
        if ((balanceOf(_account) * rewardAccount.accumulatedInput()) / totalSupply < paidOut[_account])
            throw;

        uint reward =
            (balanceOf(_account) * rewardAccount.accumulatedInput()) / totalSupply - paidOut[_account];
        if (!rewardAccount.payOut(_account, reward))
            throw;
        paidOut[_account] += reward;
        return true;
    }


    function transfer(address _to, uint256 _value) returns (bool success) {
        if (isFueled
            && now > closingTime
            && !isBlocked(msg.sender)
            && transferPaidOut(msg.sender, _to, _value)
            && super.transfer(_to, _value)) {

            return true;
        } else {
            throw;
        }
    }


    function transferWithoutReward(address _to, uint256 _value) returns (bool success) {
        if (!getMyReward())
            throw;
        return transfer(_to, _value);
    }


    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
        if (isFueled
            && now > closingTime
            && !isBlocked(_from)
            && transferPaidOut(_from, _to, _value)
            && super.transferFrom(_from, _to, _value)) {

            return true;
        } else {
            throw;
        }
    }


    function transferFromWithoutReward(
        address _from,
        address _to,
        uint256 _value
    ) returns (bool success) {

        if (!withdrawRewardFor(_from))
            throw;
        return transferFrom(_from, _to, _value);
    }


    function transferPaidOut(
        address _from,
        address _to,
        uint256 _value
    ) internal returns (bool success) {

        uint transferPaidOut = paidOut[_from] * _value / balanceOf(_from);
        if (transferPaidOut > paidOut[_from])
            throw;
        paidOut[_from] -= transferPaidOut;
        paidOut[_to] += transferPaidOut;
        return true;
    }


    function changeProposalDeposit(uint _proposalDeposit) noEther external {
        if (msg.sender != address(this) || _proposalDeposit > (actualBalance() + rewardToken[address(this)])
            / maxDepositDivisor) {

            throw;
        }
        proposalDeposit = _proposalDeposit;
    }


    function changeAllowedRecipients(address _recipient, bool _allowed) noEther external returns (bool _success) {
        if (msg.sender != curator)
            throw;
        allowedRecipients[_recipient] = _allowed;
        AllowedRecipientChanged(_recipient, _allowed);
        return true;
    }


    function isRecipientAllowed(address _recipient) internal returns (bool _isAllowed) {
        if (allowedRecipients[_recipient]
            || (_recipient == address(extraBalance)
                // only allowed when at least the amount held in the
                // extraBalance account has been spent from the DAO
                && totalRewardToken > extraBalance.accumulatedInput()))
            return true;
        else
            return false;
    }

    function actualBalance() constant returns (uint _actualBalance) {
        return this.balance - sumOfProposalDeposits;
    }


    function minQuorum(uint _value) internal constant returns (uint _minQuorum) {
        // minimum of 20% and maximum of 53.33%
        return totalSupply / minQuorumDivisor +
            (_value * totalSupply) / (3 * (actualBalance() + rewardToken[address(this)]));
    }


    function halveMinQuorum() returns (bool _success) {
        // this can only be called after `quorumHalvingPeriod` has passed or at anytime
        // by the curator with a delay of at least `minProposalDebatePeriod` between the calls
        if ((lastTimeMinQuorumMet < (now - quorumHalvingPeriod) || msg.sender == curator)
            && lastTimeMinQuorumMet < (now - minProposalDebatePeriod)) {
            lastTimeMinQuorumMet = now;
            minQuorumDivisor *= 2;
            return true;
        } else {
            return false;
        }
    }

    function createNewDAO(address _newCurator) internal returns (DAO _newDAO) {
        NewCurator(_newCurator);
        return daoCreator.createDAO(_newCurator, 0, 0, now + splitExecutionPeriod);
    }

    function numberOfProposals() constant returns (uint _numberOfProposals) {
        // Don't count index 0. It's used by isBlocked() and exists from start
        return proposals.length - 1;
    }

    function getNewDAOAddress(uint _proposalID) constant returns (address _newDAO) {
        return proposals[_proposalID].splitData[0].newDAO;
    }

    function isBlocked(address _account) internal returns (bool) {
        if (blocked[_account] == 0)
            return false;
        Proposal p = proposals[blocked[_account]];
        if (now > p.votingDeadline) {
            blocked[_account] = 0;
            return false;
        } else {
            return true;
        }
    }

    function unblockMe() returns (bool) {
        return isBlocked(msg.sender);
    }
}

contract DAO_Creator {
    function createDAO(
        address _curator,
        uint _proposalDeposit,
        uint _minTokensToCreate,
        uint _closingTime
    ) returns (DAO _newDAO) {

        return new DAO(
            _curator,
            DAO_Creator(this),
            _proposalDeposit,
            _minTokensToCreate,
            _closingTime,
            msg.sender
        );
    }
}

contract DAOSecurity {

    // The total cost of the Offer. Exactly this amount is transfered from the
    // Client to the Offer contract when the Offer is signed by the Client.
    // Set once by the Offerer.
    uint totalCosts;

    // Initial withdraw to the Contractor. It is done the moment the Offer is
    // signed.
    // Set once by the Offerer.
    uint oneTimeCosts;

    // The minimal daily withdraw limit that the Contractor accepts.
    // Set once by the Offerer.
    uint128 minDailyWithdrawLimit;

    // The amount of wei the Contractor has right to withdraw daily above the
    // initial withdraw. The Contractor does not have to do the withdraws every
    // day as this amount accumulates.
    uint128 dailyWithdrawLimit;

    // The address of the Contractor.
    address contractor;

    // The hash of the Proposal/Offer document.
    bytes32 hashOfTheProposalDocument;

    // The time of the last withdraw to the Contractor.
    uint lastPayment;

    uint dateOfSignature;
    DAO client; // address of DAO
    DAO originalClient; // address of DAO who signed the contract
    bool isContractValid;

    modifier onlyClient {
        if (msg.sender != address(client))
            throw;
        _
    }

    // Prevents methods from perfoming any value transfer
    modifier noEther() {if (msg.value > 0) throw; _}

    function DAOSecurity(
        address _contractor,
        address _client,
        bytes32 _hashOfTheProposalDocument,
        uint _totalCosts,
        uint _oneTimeCosts,
        uint128 _minDailyWithdrawLimit
    ) {
        contractor = _contractor;
        originalClient = DAO(_client);
        client = DAO(_client);
        hashOfTheProposalDocument = _hashOfTheProposalDocument;
        totalCosts = _totalCosts;
        oneTimeCosts = _oneTimeCosts;
        minDailyWithdrawLimit = _minDailyWithdrawLimit;
        dailyWithdrawLimit = _minDailyWithdrawLimit;
    }

    // non-value-transfer getters
    function getTotalCosts() noEther constant returns (uint) {
        return totalCosts;
    }

    function getOneTimeCosts() noEther constant returns (uint) {
        return oneTimeCosts;
    }

    function getMinDailyWithdrawLimit() noEther constant returns (uint128) {
        return minDailyWithdrawLimit;
    }

    function getDailyWithdrawLimit() noEther constant returns (uint128) {
        return dailyWithdrawLimit;
    }

    function getContractor() noEther constant returns (address) {
        return contractor;
    }

    function getHashOfTheProposalDocument() noEther constant returns (bytes32) {
        return hashOfTheProposalDocument;
    }

    function getLastPayment() noEther constant returns (uint) {
        return lastPayment;
    }

    function getDateOfSignature() noEther constant returns (uint) {
        return dateOfSignature;
    }

    function getClient() noEther constant returns (DAO) {
        return client;
    }

    function getOriginalClient() noEther constant returns (DAO) {
        return originalClient;
    }

    function getIsContractValid() noEther constant returns (bool) {
        return isContractValid;
    }

    function sign() {
        if (msg.sender != address(originalClient) // no good samaritans give us ether
            || msg.value != totalCosts    // no under/over payment
            || dateOfSignature != 0)      // don't sign twice
            throw;
        if (!contractor.send(oneTimeCosts))
            throw;
        dateOfSignature = now;
        isContractValid = true;
        lastPayment = now;
    }

    function setDailyWithdrawLimit(uint128 _dailyWithdrawLimit) onlyClient noEther {
        if (_dailyWithdrawLimit >= minDailyWithdrawLimit)
            dailyWithdrawLimit = _dailyWithdrawLimit;
    }

    // "fire the contractor"
    function returnRemainingEther() onlyClient {
        if (originalClient.DAOrewardAccount().call.value(this.balance)())
            isContractValid = false;
    }

    // Withdraw to the Contractor.
    //
    // Withdraw the amount of ether the Contractor has right to according to
    // the current withdraw limit.
    // Executing this function before the Offer is signed off by the Client
    // makes no sense as this contract has no ether.
    function getDailyPayment() noEther {
        if (msg.sender != contractor)
            throw;
        uint timeSinceLastPayment = now - lastPayment;
        // Calculate the amount using 1 second precision.
        uint amount = (timeSinceLastPayment * dailyWithdrawLimit) / (1 days);
        if (amount > this.balance) {
            amount = this.balance;
        }
        if (contractor.send(amount))
            lastPayment = now;
    }

    // Change the client DAO by giving the new DAO's address
    // warning: The new DAO must come either from a split of the original
    // DAO or an update via `newContract()` so that it can claim rewards
    function updateClientAddress(DAO _newClient) onlyClient noEther {
        client = _newClient;
    }

    function () {
        throw; // this is a business contract, no donations
    }
}