pragma solidity ^0.4.18;


/**
 * @title Owned contract with safe ownership pass.
 *
 * Note: all the non constant functions return false instead of throwing in case if state change
 * didn't happen yet.
 */
contract Owned {
    /**
     * Contract owner address
     */
    address public contractOwner;

    /**
     * Contract owner address
     */
    address public pendingContractOwner;

    function Owned() {
        contractOwner = msg.sender;
    }

    /**
    * @dev Owner check modifier
    */
    modifier onlyContractOwner() {
        if (contractOwner == msg.sender) {
            _;
        }
    }

    /**
     * @dev Destroy contract and scrub a data
     * @notice Only owner can call it
     */
    function destroy() onlyContractOwner {
        suicide(msg.sender);
    }

    /**
     * Prepares ownership pass.
     *
     * Can only be called by current owner.
     *
     * @param _to address of the next owner. 0x0 is not allowed.
     *
     * @return success.
     */
    function changeContractOwnership(address _to) onlyContractOwner() returns(bool) {
        if (_to  == 0x0) {
            return false;
        }

        pendingContractOwner = _to;
        return true;
    }

    /**
     * Finalize ownership pass.
     *
     * Can only be called by pending owner.
     *
     * @return success.
     */
    function claimContractOwnership() returns(bool) {
        if (pendingContractOwner != msg.sender) {
            return false;
        }

        contractOwner = pendingContractOwner;
        delete pendingContractOwner;

        return true;
    }
}

/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a * b;
        assert(a == 0 || c / a == b);
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // assert(b > 0); // Solidity automatically throws when dividing by 0
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

contract ERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed from, address indexed spender, uint256 value);
    string public symbol;

    function totalSupply() constant returns (uint256 supply);
    function balanceOf(address _owner) constant returns (uint256 balance);
    function transfer(address _to, uint256 _value) returns (bool success);
    function transferFrom(address _from, address _to, uint256 _value) returns (bool success);
    function approve(address _spender, uint256 _value) returns (bool success);
    function allowance(address _owner, address _spender) constant returns (uint256 remaining);
}


contract ATxProxy is ERC20 {
    
    bytes32 public smbl;
    address public platform;

    function __transferWithReference(address _to, uint _value, string _reference, address _sender) public returns (bool);
    function __transferFromWithReference(address _from, address _to, uint _value, string _reference, address _sender) public returns (bool);
    function __approve(address _spender, uint _value, address _sender) public returns (bool);
    function getLatestVersion() public returns (address);
    function init(address _bmcPlatform, string _symbol, string _name) public;
    function proposeUpgrade(address _newVersion) public;
}

/// @title Provides possibility manage holders? country limits and limits for holders.
contract DataControllerInterface {

    /// @notice Checks user is holder.
    /// @param _address - checking address.
    /// @return `true` if _address is registered holder, `false` otherwise.
    function isHolderAddress(address _address) public view returns (bool);

    function allowance(address _user) public view returns (uint);

    function changeAllowance(address _holder, uint _value) public returns (uint);
}
/// @title ServiceController
///
/// Base implementation
/// Serves for managing service instances
contract ServiceControllerInterface {

    /// @notice Check target address is service
    /// @param _address target address
    /// @return `true` when an address is a service, `false` otherwise
    function isService(address _address) public view returns (bool);
}



contract ATxAssetInterface {

    DataControllerInterface public dataController;
    ServiceControllerInterface public serviceController;

    function __transferWithReference(address _to, uint _value, string _reference, address _sender) public returns (bool);
    function __transferFromWithReference(address _from, address _to, uint _value, string _reference, address _sender) public returns (bool);
    function __approve(address _spender, uint _value, address _sender) public returns (bool);
    function __process(bytes /*_data*/, address /*_sender*/) payable public {
        revert();
    }
}

contract AssetProxy is ERC20 {
    
    bytes32 public smbl;
    address public platform;

    function __transferWithReference(address _to, uint _value, string _reference, address _sender) public returns (bool);
    function __transferFromWithReference(address _from, address _to, uint _value, string _reference, address _sender) public returns (bool);
    function __approve(address _spender, uint _value, address _sender) public returns (bool);
    function getLatestVersion() public returns (address);
    function init(address _bmcPlatform, string _symbol, string _name) public;
    function proposeUpgrade(address _newVersion) public;
}


contract BasicAsset is ATxAssetInterface {

    // Assigned asset proxy contract, immutable.
    address public proxy;

    /**
     * Only assigned proxy is allowed to call.
     */
    modifier onlyProxy() {
        if (proxy == msg.sender) {
            _;
        }
    }

    /**
     * Sets asset proxy address.
     *
     * Can be set only once.
     *
     * @param _proxy asset proxy contract address.
     *
     * @return success.
     * @dev function is final, and must not be overridden.
     */
    function init(address _proxy) public returns (bool) {
        if (address(proxy) != 0x0) {
            return false;
        }
        proxy = _proxy;
        return true;
    }

    /**
     * Passes execution into virtual function.
     *
     * Can only be called by assigned asset proxy.
     *
     * @return success.
     * @dev function is final, and must not be overridden.
     */
    function __transferWithReference(address _to, uint _value, string _reference, address _sender) public onlyProxy returns (bool) {
        return _transferWithReference(_to, _value, _reference, _sender);
    }

    /**
     * Passes execution into virtual function.
     *
     * Can only be called by assigned asset proxy.
     *
     * @return success.
     * @dev function is final, and must not be overridden.
     */
    function __transferFromWithReference(address _from, address _to, uint _value, string _reference, address _sender) public onlyProxy returns (bool) {
        return _transferFromWithReference(_from, _to, _value, _reference, _sender);
    }

    /**
     * Passes execution into virtual function.
     *
     * Can only be called by assigned asset proxy.
     *
     * @return success.
     * @dev function is final, and must not be overridden.
     */
    function __approve(address _spender, uint _value, address _sender) public onlyProxy returns (bool) {
        return _approve(_spender, _value, _sender);
    }

    /**
     * Calls back without modifications.
     *
     * @return success.
     * @dev function is virtual, and meant to be overridden.
     */
    function _transferWithReference(address _to, uint _value, string _reference, address _sender) internal returns (bool) {
        return AssetProxy(proxy).__transferWithReference(_to, _value, _reference, _sender);
    }

    /**
     * Calls back without modifications.
     *
     * @return success.
     * @dev function is virtual, and meant to be overridden.
     */
    function _transferFromWithReference(address _from, address _to, uint _value, string _reference, address _sender) internal returns (bool) {
        return AssetProxy(proxy).__transferFromWithReference(_from, _to, _value, _reference, _sender);
    }

    /**
     * Calls back without modifications.
     *
     * @return success.
     * @dev function is virtual, and meant to be overridden.
     */
    function _approve(address _spender, uint _value, address _sender) internal returns (bool) {
        return AssetProxy(proxy).__approve(_spender, _value, _sender);
    }
}


/// @title ServiceAllowance.
///
/// Provides a way to delegate operation allowance decision to a service contract
contract ServiceAllowance {
    function isTransferAllowed(address _from, address _to, address _sender, address _token, uint _value) public view returns (bool);
}

contract ERC20Interface {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed from, address indexed spender, uint256 value);
    string public symbol;

    function totalSupply() constant returns (uint256 supply);
    function balanceOf(address _owner) constant returns (uint256 balance);
    function transfer(address _to, uint256 _value) returns (bool success);
    function transferFrom(address _from, address _to, uint256 _value) returns (bool success);
    function approve(address _spender, uint256 _value) returns (bool success);
    function allowance(address _owner, address _spender) constant returns (uint256 remaining);
}

/**
 * @title Generic owned destroyable contract
 */
contract Object is Owned {
    /**
    *  Common result code. Means everything is fine.
    */
    uint constant OK = 1;
    uint constant OWNED_ACCESS_DENIED_ONLY_CONTRACT_OWNER = 8;

    function withdrawnTokens(address[] tokens, address _to) onlyContractOwner returns(uint) {
        for(uint i=0;i<tokens.length;i++) {
            address token = tokens[i];
            uint balance = ERC20Interface(token).balanceOf(this);
            if(balance != 0)
                ERC20Interface(token).transfer(_to,balance);
        }
        return OK;
    }

    function checkOnlyContractOwner() internal constant returns(uint) {
        if (contractOwner == msg.sender) {
            return OK;
        }

        return OWNED_ACCESS_DENIED_ONLY_CONTRACT_OWNER;
    }
}

contract GroupsAccessManagerEmitter {

    event UserCreated(address user);
    event UserDeleted(address user);
    event GroupCreated(bytes32 groupName);
    event GroupActivated(bytes32 groupName);
    event GroupDeactivated(bytes32 groupName);
    event UserToGroupAdded(address user, bytes32 groupName);
    event UserFromGroupRemoved(address user, bytes32 groupName);
}


/// @title Group Access Manager
///
/// Base implementation
/// This contract serves as group manager
contract GroupsAccessManager is Object, GroupsAccessManagerEmitter {

    uint constant USER_MANAGER_SCOPE = 111000;
    uint constant USER_MANAGER_MEMBER_ALREADY_EXIST = USER_MANAGER_SCOPE + 1;
    uint constant USER_MANAGER_GROUP_ALREADY_EXIST = USER_MANAGER_SCOPE + 2;
    uint constant USER_MANAGER_OBJECT_ALREADY_SECURED = USER_MANAGER_SCOPE + 3;
    uint constant USER_MANAGER_CONFIRMATION_HAS_COMPLETED = USER_MANAGER_SCOPE + 4;
    uint constant USER_MANAGER_USER_HAS_CONFIRMED = USER_MANAGER_SCOPE + 5;
    uint constant USER_MANAGER_NOT_ENOUGH_GAS = USER_MANAGER_SCOPE + 6;
    uint constant USER_MANAGER_INVALID_INVOCATION = USER_MANAGER_SCOPE + 7;
    uint constant USER_MANAGER_DONE = USER_MANAGER_SCOPE + 11;
    uint constant USER_MANAGER_CANCELLED = USER_MANAGER_SCOPE + 12;

    using SafeMath for uint;

    struct Member {
        address addr;
        uint groupsCount;
        mapping(bytes32 => uint) groupName2index;
        mapping(uint => uint) index2globalIndex;
    }

    struct Group {
        bytes32 name;
        uint priority;
        uint membersCount;
        mapping(address => uint) memberAddress2index;
        mapping(uint => uint) index2globalIndex;
    }

    uint public membersCount;
    mapping(uint => address) index2memberAddress;
    mapping(address => uint) memberAddress2index;
    mapping(address => Member) address2member;

    uint public groupsCount;
    mapping(uint => bytes32) index2groupName;
    mapping(bytes32 => uint) groupName2index;
    mapping(bytes32 => Group) groupName2group;
    mapping(bytes32 => bool) public groupsBlocked; // if groupName => true, then couldn't be used for confirmation

    function() payable public {
        revert();
    }

    /// @notice Register user
    /// Can be called only by contract owner
    ///
    /// @param _user user address
    ///
    /// @return code
    function registerUser(address _user) external onlyContractOwner returns (uint) {
        require(_user != 0x0);

        if (isRegisteredUser(_user)) {
            return USER_MANAGER_MEMBER_ALREADY_EXIST;
        }

        uint _membersCount = membersCount.add(1);
        membersCount = _membersCount;
        memberAddress2index[_user] = _membersCount;
        index2memberAddress[_membersCount] = _user;
        address2member[_user] = Member(_user, 0);

        UserCreated(_user);
        return OK;
    }

    /// @notice Discard user registration
    /// Can be called only by contract owner
    ///
    /// @param _user user address
    ///
    /// @return code
    function unregisterUser(address _user) external onlyContractOwner returns (uint) {
        require(_user != 0x0);

        uint _memberIndex = memberAddress2index[_user];
        if (_memberIndex == 0 || address2member[_user].groupsCount != 0) {
            return USER_MANAGER_INVALID_INVOCATION;
        }

        uint _membersCount = membersCount;
        delete memberAddress2index[_user];
        if (_memberIndex != _membersCount) {
            address _lastUser = index2memberAddress[_membersCount];
            index2memberAddress[_memberIndex] = _lastUser;
            memberAddress2index[_lastUser] = _memberIndex;
        }
        delete address2member[_user];
        delete index2memberAddress[_membersCount];
        delete memberAddress2index[_user];
        membersCount = _membersCount.sub(1);

        UserDeleted(_user);
        return OK;
    }

    /// @notice Create group
    /// Can be called only by contract owner
    ///
    /// @param _groupName group name
    /// @param _priority group priority
    ///
    /// @return code
    function createGroup(bytes32 _groupName, uint _priority) external onlyContractOwner returns (uint) {
        require(_groupName != bytes32(0));

        if (isGroupExists(_groupName)) {
            return USER_MANAGER_GROUP_ALREADY_EXIST;
        }

        uint _groupsCount = groupsCount.add(1);
        groupName2index[_groupName] = _groupsCount;
        index2groupName[_groupsCount] = _groupName;
        groupName2group[_groupName] = Group(_groupName, _priority, 0);
        groupsCount = _groupsCount;

        GroupCreated(_groupName);
        return OK;
    }

    /// @notice Change group status
    /// Can be called only by contract owner
    ///
    /// @param _groupName group name
    /// @param _blocked block status
    ///
    /// @return code
    function changeGroupActiveStatus(bytes32 _groupName, bool _blocked) external onlyContractOwner returns (uint) {
        require(isGroupExists(_groupName));
        groupsBlocked[_groupName] = _blocked;
        return OK;
    }

    /// @notice Add users in group
    /// Can be called only by contract owner
    ///
    /// @param _groupName group name
    /// @param _users user array
    ///
    /// @return code
    function addUsersToGroup(bytes32 _groupName, address[] _users) external onlyContractOwner returns (uint) {
        require(isGroupExists(_groupName));

        Group storage _group = groupName2group[_groupName];
        uint _groupMembersCount = _group.membersCount;

        for (uint _userIdx = 0; _userIdx < _users.length; ++_userIdx) {
            address _user = _users[_userIdx];
            uint _memberIndex = memberAddress2index[_user];
            require(_memberIndex != 0);

            if (_group.memberAddress2index[_user] != 0) {
                continue;
            }

            _groupMembersCount = _groupMembersCount.add(1);
            _group.memberAddress2index[_user] = _groupMembersCount;
            _group.index2globalIndex[_groupMembersCount] = _memberIndex;

            _addGroupToMember(_user, _groupName);

            UserToGroupAdded(_user, _groupName);
        }
        _group.membersCount = _groupMembersCount;

        return OK;
    }

    /// @notice Remove users in group
    /// Can be called only by contract owner
    ///
    /// @param _groupName group name
    /// @param _users user array
    ///
    /// @return code
    function removeUsersFromGroup(bytes32 _groupName, address[] _users) external onlyContractOwner returns (uint) {
        require(isGroupExists(_groupName));

        Group storage _group = groupName2group[_groupName];
        uint _groupMembersCount = _group.membersCount;

        for (uint _userIdx = 0; _userIdx < _users.length; ++_userIdx) {
            address _user = _users[_userIdx];
            uint _memberIndex = memberAddress2index[_user];
            uint _groupMemberIndex = _group.memberAddress2index[_user];

            if (_memberIndex == 0 || _groupMemberIndex == 0) {
                continue;
            }

            if (_groupMemberIndex != _groupMembersCount) {
                uint _lastUserGlobalIndex = _group.index2globalIndex[_groupMembersCount];
                address _lastUser = index2memberAddress[_lastUserGlobalIndex];
                _group.index2globalIndex[_groupMemberIndex] = _lastUserGlobalIndex;
                _group.memberAddress2index[_lastUser] = _groupMemberIndex;
            }
            delete _group.memberAddress2index[_user];
            delete _group.index2globalIndex[_groupMembersCount];
            _groupMembersCount = _groupMembersCount.sub(1);

            _removeGroupFromMember(_user, _groupName);

            UserFromGroupRemoved(_user, _groupName);
        }
        _group.membersCount = _groupMembersCount;

        return OK;
    }

    /// @notice Check is user registered
    ///
    /// @param _user user address
    ///
    /// @return status
    function isRegisteredUser(address _user) public view returns (bool) {
        return memberAddress2index[_user] != 0;
    }

    /// @notice Check is user in group
    ///
    /// @param _groupName user array
    /// @param _user user array
    ///
    /// @return status
    function isUserInGroup(bytes32 _groupName, address _user) public view returns (bool) {
        return isRegisteredUser(_user) && address2member[_user].groupName2index[_groupName] != 0;
    }

    /// @notice Check is group exist
    ///
    /// @param _groupName group name
    ///
    /// @return status
    function isGroupExists(bytes32 _groupName) public view returns (bool) {
        return groupName2index[_groupName] != 0;
    }

    /// @notice Get current group names
    ///
    /// @return group names
    function getGroups() public view returns (bytes32[] _groups) {
        uint _groupsCount = groupsCount;
        _groups = new bytes32[](_groupsCount);
        for (uint _groupIdx = 0; _groupIdx < _groupsCount; ++_groupIdx) {
            _groups[_groupIdx] = index2groupName[_groupIdx + 1];
        }
    }

    // PRIVATE

    function _removeGroupFromMember(address _user, bytes32 _groupName) private {
        Member storage _member = address2member[_user];
        uint _memberGroupsCount = _member.groupsCount;
        uint _memberGroupIndex = _member.groupName2index[_groupName];
        if (_memberGroupIndex != _memberGroupsCount) {
            uint _lastGroupGlobalIndex = _member.index2globalIndex[_memberGroupsCount];
            bytes32 _lastGroupName = index2groupName[_lastGroupGlobalIndex];
            _member.index2globalIndex[_memberGroupIndex] = _lastGroupGlobalIndex;
            _member.groupName2index[_lastGroupName] = _memberGroupIndex;
        }
        delete _member.groupName2index[_groupName];
        delete _member.index2globalIndex[_memberGroupsCount];
        _member.groupsCount = _memberGroupsCount.sub(1);
    }

    function _addGroupToMember(address _user, bytes32 _groupName) private {
        Member storage _member = address2member[_user];
        uint _memberGroupsCount = _member.groupsCount.add(1);
        _member.groupName2index[_groupName] = _memberGroupsCount;
        _member.index2globalIndex[_memberGroupsCount] = groupName2index[_groupName];
        _member.groupsCount = _memberGroupsCount;
    }
}

contract PendingManagerEmitter {

    event PolicyRuleAdded(bytes4 sig, address contractAddress, bytes32 key, bytes32 groupName, uint acceptLimit, uint declinesLimit);
    event PolicyRuleRemoved(bytes4 sig, address contractAddress, bytes32 key, bytes32 groupName);

    event ProtectionTxAdded(bytes32 key, bytes32 sig, uint blockNumber);
    event ProtectionTxAccepted(bytes32 key, address indexed sender, bytes32 groupNameVoted);
    event ProtectionTxDone(bytes32 key);
    event ProtectionTxDeclined(bytes32 key, address indexed sender, bytes32 groupNameVoted);
    event ProtectionTxCancelled(bytes32 key);
    event ProtectionTxVoteRevoked(bytes32 key, address indexed sender, bytes32 groupNameVoted);
    event TxDeleted(bytes32 key);

    event Error(uint errorCode);

    function _emitError(uint _errorCode) internal returns (uint) {
        Error(_errorCode);
        return _errorCode;
    }
}

contract PendingManagerInterface {

    function signIn(address _contract) external returns (uint);
    function signOut(address _contract) external returns (uint);

    function addPolicyRule(
        bytes4 _sig, 
        address _contract, 
        bytes32 _groupName, 
        uint _acceptLimit, 
        uint _declineLimit 
        ) 
        external returns (uint);
        
    function removePolicyRule(
        bytes4 _sig, 
        address _contract, 
        bytes32 _groupName
        ) 
        external returns (uint);

    function addTx(bytes32 _key, bytes4 _sig, address _contract) external returns (uint);
    function deleteTx(bytes32 _key) external returns (uint);

    function accept(bytes32 _key, bytes32 _votingGroupName) external returns (uint);
    function decline(bytes32 _key, bytes32 _votingGroupName) external returns (uint);
    function revoke(bytes32 _key) external returns (uint);

    function hasConfirmedRecord(bytes32 _key) public view returns (uint);
    function getPolicyDetails(bytes4 _sig, address _contract) public view returns (
        bytes32[] _groupNames,
        uint[] _acceptLimits,
        uint[] _declineLimits,
        uint _totalAcceptedLimit,
        uint _totalDeclinedLimit
        );
}

/// @title PendingManager
///
/// Base implementation
/// This contract serves as pending manager for transaction status
contract PendingManager is Object, PendingManagerEmitter, PendingManagerInterface {

    uint constant NO_RECORDS_WERE_FOUND = 4;
    uint constant PENDING_MANAGER_SCOPE = 4000;
    uint constant PENDING_MANAGER_INVALID_INVOCATION = PENDING_MANAGER_SCOPE + 1;
    uint constant PENDING_MANAGER_HASNT_VOTED = PENDING_MANAGER_SCOPE + 2;
    uint constant PENDING_DUPLICATE_TX = PENDING_MANAGER_SCOPE + 3;
    uint constant PENDING_MANAGER_CONFIRMED = PENDING_MANAGER_SCOPE + 4;
    uint constant PENDING_MANAGER_REJECTED = PENDING_MANAGER_SCOPE + 5;
    uint constant PENDING_MANAGER_IN_PROCESS = PENDING_MANAGER_SCOPE + 6;
    uint constant PENDING_MANAGER_TX_DOESNT_EXIST = PENDING_MANAGER_SCOPE + 7;
    uint constant PENDING_MANAGER_TX_WAS_DECLINED = PENDING_MANAGER_SCOPE + 8;
    uint constant PENDING_MANAGER_TX_WAS_NOT_CONFIRMED = PENDING_MANAGER_SCOPE + 9;
    uint constant PENDING_MANAGER_INSUFFICIENT_GAS = PENDING_MANAGER_SCOPE + 10;
    uint constant PENDING_MANAGER_POLICY_NOT_FOUND = PENDING_MANAGER_SCOPE + 11;

    using SafeMath for uint;

    enum GuardState {
        Decline, Confirmed, InProcess
    }

    struct Requirements {
        bytes32 groupName;
        uint acceptLimit;
        uint declineLimit;
    }

    struct Policy {
        uint groupsCount;
        mapping(uint => Requirements) participatedGroups; // index => globalGroupIndex
        mapping(bytes32 => uint) groupName2index; // groupName => localIndex
        
        uint totalAcceptedLimit;
        uint totalDeclinedLimit;

        uint securesCount;
        mapping(uint => uint) index2txIndex;
        mapping(uint => uint) txIndex2index;
    }

    struct Vote {
        bytes32 groupName;
        bool accepted;
    }

    struct Guard {
        GuardState state;
        uint basePolicyIndex;

        uint alreadyAccepted;
        uint alreadyDeclined;
        
        mapping(address => Vote) votes; // member address => vote
        mapping(bytes32 => uint) acceptedCount; // groupName => how many from group has already accepted
        mapping(bytes32 => uint) declinedCount; // groupName => how many from group has already declined
    }

    address public accessManager;

    mapping(address => bool) public authorized;

    uint public policiesCount;
    mapping(uint => bytes32) index2PolicyId; // index => policy hash
    mapping(bytes32 => uint) policyId2Index; // policy hash => index
    mapping(bytes32 => Policy) policyId2policy; // policy hash => policy struct

    uint public txCount;
    mapping(uint => bytes32) index2txKey;
    mapping(bytes32 => uint) txKey2index; // tx key => index
    mapping(bytes32 => Guard) txKey2guard;

    /// @dev Execution is allowed only by authorized contract
    modifier onlyAuthorized {
        if (authorized[msg.sender] || address(this) == msg.sender) {
            _;
        }
    }

    /// @dev Pending Manager's constructor
    ///
    /// @param _accessManager access manager's address
    function PendingManager(address _accessManager) public {
        require(_accessManager != 0x0);
        accessManager = _accessManager;
    }

    function() payable public {
        revert();
    }

    /// @notice Update access manager address
    ///
    /// @param _accessManager access manager's address
    function setAccessManager(address _accessManager) external onlyContractOwner returns (uint) {
        require(_accessManager != 0x0);
        accessManager = _accessManager;
        return OK;
    }

    /// @notice Sign in contract
    ///
    /// @param _contract contract's address
    function signIn(address _contract) external onlyContractOwner returns (uint) {
        require(_contract != 0x0);
        authorized[_contract] = true;
        return OK;
    }

    /// @notice Sign out contract
    ///
    /// @param _contract contract's address
    function signOut(address _contract) external onlyContractOwner returns (uint) {
        require(_contract != 0x0);
        delete authorized[_contract];
        return OK;
    }

    /// @notice Register new policy rule
    /// Can be called only by contract owner
    ///
    /// @param _sig target method signature
    /// @param _contract target contract address
    /// @param _groupName group's name
    /// @param _acceptLimit accepted vote limit
    /// @param _declineLimit decline vote limit
    ///
    /// @return code
    function addPolicyRule(
        bytes4 _sig,
        address _contract,
        bytes32 _groupName,
        uint _acceptLimit,
        uint _declineLimit
    )
    onlyContractOwner
    external
    returns (uint)
    {
        require(_sig != 0x0);
        require(_contract != 0x0);
        require(GroupsAccessManager(accessManager).isGroupExists(_groupName));
        require(_acceptLimit != 0);
        require(_declineLimit != 0);

        bytes32 _policyHash = keccak256(_sig, _contract);
        
        if (policyId2Index[_policyHash] == 0) {
            uint _policiesCount = policiesCount.add(1);
            index2PolicyId[_policiesCount] = _policyHash;
            policyId2Index[_policyHash] = _policiesCount;
            policiesCount = _policiesCount;
        }

        Policy storage _policy = policyId2policy[_policyHash];
        uint _policyGroupsCount = _policy.groupsCount;

        if (_policy.groupName2index[_groupName] == 0) {
            _policyGroupsCount += 1;
            _policy.groupName2index[_groupName] = _policyGroupsCount;
            _policy.participatedGroups[_policyGroupsCount].groupName = _groupName;
            _policy.groupsCount = _policyGroupsCount;
        }

        uint _previousAcceptLimit = _policy.participatedGroups[_policyGroupsCount].acceptLimit;
        uint _previousDeclineLimit = _policy.participatedGroups[_policyGroupsCount].declineLimit;
        _policy.participatedGroups[_policyGroupsCount].acceptLimit = _acceptLimit;
        _policy.participatedGroups[_policyGroupsCount].declineLimit = _declineLimit;
        _policy.totalAcceptedLimit = _policy.totalAcceptedLimit.sub(_previousAcceptLimit).add(_acceptLimit);
        _policy.totalDeclinedLimit = _policy.totalDeclinedLimit.sub(_previousDeclineLimit).add(_declineLimit);

        PolicyRuleAdded(_sig, _contract, _policyHash, _groupName, _acceptLimit, _declineLimit);
        return OK;
    }

    /// @notice Remove policy rule
    /// Can be called only by contract owner
    ///
    /// @param _groupName group's name
    ///
    /// @return code
    function removePolicyRule(
        bytes4 _sig,
        address _contract,
        bytes32 _groupName
    ) 
    onlyContractOwner 
    external 
    returns (uint) 
    {
        require(_sig != bytes4(0));
        require(_contract != 0x0);
        require(GroupsAccessManager(accessManager).isGroupExists(_groupName));

        bytes32 _policyHash = keccak256(_sig, _contract);
        Policy storage _policy = policyId2policy[_policyHash];
        uint _policyGroupNameIndex = _policy.groupName2index[_groupName];

        if (_policyGroupNameIndex == 0) {
            return _emitError(PENDING_MANAGER_INVALID_INVOCATION);
        }

        uint _policyGroupsCount = _policy.groupsCount;
        if (_policyGroupNameIndex != _policyGroupsCount) {
            Requirements storage _requirements = _policy.participatedGroups[_policyGroupsCount];
            _policy.participatedGroups[_policyGroupNameIndex] = _requirements;
            _policy.groupName2index[_requirements.groupName] = _policyGroupNameIndex;
        }

        _policy.totalAcceptedLimit = _policy.totalAcceptedLimit.sub(_policy.participatedGroups[_policyGroupsCount].acceptLimit);
        _policy.totalDeclinedLimit = _policy.totalDeclinedLimit.sub(_policy.participatedGroups[_policyGroupsCount].declineLimit);

        delete _policy.groupName2index[_groupName];
        delete _policy.participatedGroups[_policyGroupsCount];
        _policy.groupsCount = _policyGroupsCount.sub(1);

        PolicyRuleRemoved(_sig, _contract, _policyHash, _groupName);
        return OK;
    }

    /// @notice Add transaction
    ///
    /// @param _key transaction id
    ///
    /// @return code
    function addTx(bytes32 _key, bytes4 _sig, address _contract) external onlyAuthorized returns (uint) {
        require(_key != bytes32(0));
        require(_sig != bytes4(0));
        require(_contract != 0x0);

        bytes32 _policyHash = keccak256(_sig, _contract);
        require(isPolicyExist(_policyHash));

        if (isTxExist(_key)) {
            return _emitError(PENDING_DUPLICATE_TX);
        }

        if (_policyHash == bytes32(0)) {
            return _emitError(PENDING_MANAGER_POLICY_NOT_FOUND);
        }

        uint _index = txCount.add(1);
        txCount = _index;
        index2txKey[_index] = _key;
        txKey2index[_key] = _index;

        Guard storage _guard = txKey2guard[_key];
        _guard.basePolicyIndex = policyId2Index[_policyHash];
        _guard.state = GuardState.InProcess;

        Policy storage _policy = policyId2policy[_policyHash];
        uint _counter = _policy.securesCount.add(1);
        _policy.securesCount = _counter;
        _policy.index2txIndex[_counter] = _index;
        _policy.txIndex2index[_index] = _counter;

        ProtectionTxAdded(_key, _policyHash, block.number);
        return OK;
    }

    /// @notice Delete transaction
    /// @param _key transaction id
    /// @return code
    function deleteTx(bytes32 _key) external onlyContractOwner returns (uint) {
        require(_key != bytes32(0));

        if (!isTxExist(_key)) {
            return _emitError(PENDING_MANAGER_TX_DOESNT_EXIST);
        }

        uint _txsCount = txCount;
        uint _txIndex = txKey2index[_key];
        if (_txIndex != _txsCount) {
            bytes32 _last = index2txKey[txCount];
            index2txKey[_txIndex] = _last;
            txKey2index[_last] = _txIndex;
        }

        delete txKey2index[_key];
        delete index2txKey[_txsCount];
        txCount = _txsCount.sub(1);

        uint _basePolicyIndex = txKey2guard[_key].basePolicyIndex;
        Policy storage _policy = policyId2policy[index2PolicyId[_basePolicyIndex]];
        uint _counter = _policy.securesCount;
        uint _policyTxIndex = _policy.txIndex2index[_txIndex];
        if (_policyTxIndex != _counter) {
            uint _movedTxIndex = _policy.index2txIndex[_counter];
            _policy.index2txIndex[_policyTxIndex] = _movedTxIndex;
            _policy.txIndex2index[_movedTxIndex] = _policyTxIndex;
        }

        delete _policy.index2txIndex[_counter];
        delete _policy.txIndex2index[_txIndex];
        _policy.securesCount = _counter.sub(1);

        TxDeleted(_key);
        return OK;
    }

    /// @notice Accept transaction
    /// Can be called only by registered user in GroupsAccessManager
    ///
    /// @param _key transaction id
    ///
    /// @return code
    function accept(bytes32 _key, bytes32 _votingGroupName) external returns (uint) {
        if (!isTxExist(_key)) {
            return _emitError(PENDING_MANAGER_TX_DOESNT_EXIST);
        }

        if (!GroupsAccessManager(accessManager).isUserInGroup(_votingGroupName, msg.sender)) {
            return _emitError(PENDING_MANAGER_INVALID_INVOCATION);
        }

        Guard storage _guard = txKey2guard[_key];
        if (_guard.state != GuardState.InProcess) {
            return _emitError(PENDING_MANAGER_INVALID_INVOCATION);
        }

        if (_guard.votes[msg.sender].groupName != bytes32(0) && _guard.votes[msg.sender].accepted) {
            return _emitError(PENDING_MANAGER_INVALID_INVOCATION);
        }

        Policy storage _policy = policyId2policy[index2PolicyId[_guard.basePolicyIndex]];
        uint _policyGroupIndex = _policy.groupName2index[_votingGroupName];
        uint _groupAcceptedVotesCount = _guard.acceptedCount[_votingGroupName];
        if (_groupAcceptedVotesCount == _policy.participatedGroups[_policyGroupIndex].acceptLimit) {
            return _emitError(PENDING_MANAGER_INVALID_INVOCATION);
        }

        _guard.votes[msg.sender] = Vote(_votingGroupName, true);
        _guard.acceptedCount[_votingGroupName] = _groupAcceptedVotesCount + 1;
        uint _alreadyAcceptedCount = _guard.alreadyAccepted + 1;
        _guard.alreadyAccepted = _alreadyAcceptedCount;

        ProtectionTxAccepted(_key, msg.sender, _votingGroupName);

        if (_alreadyAcceptedCount == _policy.totalAcceptedLimit) {
            _guard.state = GuardState.Confirmed;
            ProtectionTxDone(_key);
        }

        return OK;
    }

    /// @notice Decline transaction
    /// Can be called only by registered user in GroupsAccessManager
    ///
    /// @param _key transaction id
    ///
    /// @return code
    function decline(bytes32 _key, bytes32 _votingGroupName) external returns (uint) {
        if (!isTxExist(_key)) {
            return _emitError(PENDING_MANAGER_TX_DOESNT_EXIST);
        }

        if (!GroupsAccessManager(accessManager).isUserInGroup(_votingGroupName, msg.sender)) {
            return _emitError(PENDING_MANAGER_INVALID_INVOCATION);
        }

        Guard storage _guard = txKey2guard[_key];
        if (_guard.state != GuardState.InProcess) {
            return _emitError(PENDING_MANAGER_INVALID_INVOCATION);
        }

        if (_guard.votes[msg.sender].groupName != bytes32(0) && !_guard.votes[msg.sender].accepted) {
            return _emitError(PENDING_MANAGER_INVALID_INVOCATION);
        }

        Policy storage _policy = policyId2policy[index2PolicyId[_guard.basePolicyIndex]];
        uint _policyGroupIndex = _policy.groupName2index[_votingGroupName];
        uint _groupDeclinedVotesCount = _guard.declinedCount[_votingGroupName];
        if (_groupDeclinedVotesCount == _policy.participatedGroups[_policyGroupIndex].declineLimit) {
            return _emitError(PENDING_MANAGER_INVALID_INVOCATION);
        }

        _guard.votes[msg.sender] = Vote(_votingGroupName, false);
        _guard.declinedCount[_votingGroupName] = _groupDeclinedVotesCount + 1;
        uint _alreadyDeclinedCount = _guard.alreadyDeclined + 1;
        _guard.alreadyDeclined = _alreadyDeclinedCount;


        ProtectionTxDeclined(_key, msg.sender, _votingGroupName);

        if (_alreadyDeclinedCount == _policy.totalDeclinedLimit) {
            _guard.state = GuardState.Decline;
            ProtectionTxCancelled(_key);
        }

        return OK;
    }

    /// @notice Revoke user votes for transaction
    /// Can be called only by contract owner
    ///
    /// @param _key transaction id
    /// @param _user target user address
    ///
    /// @return code
    function forceRejectVotes(bytes32 _key, address _user) external onlyContractOwner returns (uint) {
        return _revoke(_key, _user);
    }

    /// @notice Revoke vote for transaction
    /// Can be called only by authorized user
    /// @param _key transaction id
    /// @return code
    function revoke(bytes32 _key) external returns (uint) {
        return _revoke(_key, msg.sender);
    }

    /// @notice Check transaction status
    /// @param _key transaction id
    /// @return code
    function hasConfirmedRecord(bytes32 _key) public view returns (uint) {
        require(_key != bytes32(0));

        if (!isTxExist(_key)) {
            return NO_RECORDS_WERE_FOUND;
        }

        Guard storage _guard = txKey2guard[_key];
        return _guard.state == GuardState.InProcess
        ? PENDING_MANAGER_IN_PROCESS
        : _guard.state == GuardState.Confirmed
        ? OK
        : PENDING_MANAGER_REJECTED;
    }


    /// @notice Check policy details
    ///
    /// @return _groupNames group names included in policies
    /// @return _acceptLimits accept limit for group
    /// @return _declineLimits decline limit for group
    function getPolicyDetails(bytes4 _sig, address _contract)
    public
    view
    returns (
        bytes32[] _groupNames,
        uint[] _acceptLimits,
        uint[] _declineLimits,
        uint _totalAcceptedLimit,
        uint _totalDeclinedLimit
    ) {
        require(_sig != bytes4(0));
        require(_contract != 0x0);
        
        bytes32 _policyHash = keccak256(_sig, _contract);
        uint _policyIdx = policyId2Index[_policyHash];
        if (_policyIdx == 0) {
            return;
        }

        Policy storage _policy = policyId2policy[_policyHash];
        uint _policyGroupsCount = _policy.groupsCount;
        _groupNames = new bytes32[](_policyGroupsCount);
        _acceptLimits = new uint[](_policyGroupsCount);
        _declineLimits = new uint[](_policyGroupsCount);

        for (uint _idx = 0; _idx < _policyGroupsCount; ++_idx) {
            Requirements storage _requirements = _policy.participatedGroups[_idx + 1];
            _groupNames[_idx] = _requirements.groupName;
            _acceptLimits[_idx] = _requirements.acceptLimit;
            _declineLimits[_idx] = _requirements.declineLimit;
        }

        (_totalAcceptedLimit, _totalDeclinedLimit) = (_policy.totalAcceptedLimit, _policy.totalDeclinedLimit);
    }

    /// @notice Check policy include target group
    /// @param _policyHash policy hash (sig, contract address)
    /// @param _groupName group id
    /// @return bool
    function isGroupInPolicy(bytes32 _policyHash, bytes32 _groupName) public view returns (bool) {
        Policy storage _policy = policyId2policy[_policyHash];
        return _policy.groupName2index[_groupName] != 0;
    }

    /// @notice Check is policy exist
    /// @param _policyHash policy hash (sig, contract address)
    /// @return bool
    function isPolicyExist(bytes32 _policyHash) public view returns (bool) {
        return policyId2Index[_policyHash] != 0;
    }

    /// @notice Check is transaction exist
    /// @param _key transaction id
    /// @return bool
    function isTxExist(bytes32 _key) public view returns (bool){
        return txKey2index[_key] != 0;
    }

    function _updateTxState(Policy storage _policy, Guard storage _guard, uint confirmedAmount, uint declineAmount) private {
        if (declineAmount != 0 && _guard.state != GuardState.Decline) {
            _guard.state = GuardState.Decline;
        } else if (confirmedAmount >= _policy.groupsCount && _guard.state != GuardState.Confirmed) {
            _guard.state = GuardState.Confirmed;
        } else if (_guard.state != GuardState.InProcess) {
            _guard.state = GuardState.InProcess;
        }
    }

    function _revoke(bytes32 _key, address _user) private returns (uint) {
        require(_key != bytes32(0));
        require(_user != 0x0);

        if (!isTxExist(_key)) {
            return _emitError(PENDING_MANAGER_TX_DOESNT_EXIST);
        }

        Guard storage _guard = txKey2guard[_key];
        if (_guard.state != GuardState.InProcess) {
            return _emitError(PENDING_MANAGER_INVALID_INVOCATION);
        }

        bytes32 _votedGroupName = _guard.votes[_user].groupName;
        if (_votedGroupName == bytes32(0)) {
            return _emitError(PENDING_MANAGER_HASNT_VOTED);
        }

        bool isAcceptedVote = _guard.votes[_user].accepted;
        if (isAcceptedVote) {
            _guard.acceptedCount[_votedGroupName] = _guard.acceptedCount[_votedGroupName].sub(1);
            _guard.alreadyAccepted = _guard.alreadyAccepted.sub(1);
        } else {
            _guard.declinedCount[_votedGroupName] = _guard.declinedCount[_votedGroupName].sub(1);
            _guard.alreadyDeclined = _guard.alreadyDeclined.sub(1);

        }

        delete _guard.votes[_user];

        ProtectionTxVoteRevoked(_key, _user, _votedGroupName);
        return OK;
    }
}



/// @title MultiSigAdapter
///
/// Abstract implementation
/// This contract serves as transaction signer
contract MultiSigAdapter is Object {

    uint constant MULTISIG_ADDED = 3;
    uint constant NO_RECORDS_WERE_FOUND = 4;

    modifier isAuthorized {
        if (msg.sender == contractOwner || msg.sender == getPendingManager()) {
            _;
        }
    }

    /// @notice Get pending address
    /// @dev abstract. Needs child implementation
    ///
    /// @return pending address
    function getPendingManager() public view returns (address);

    /// @notice Sign current transaction and add it to transaction pending queue
    ///
    /// @return code
    function _multisig(bytes32 _args, uint _block) internal returns (uint _code) {
        bytes32 _txHash = _getKey(_args, _block);
        address _manager = getPendingManager();

        _code = PendingManager(_manager).hasConfirmedRecord(_txHash);
        if (_code != NO_RECORDS_WERE_FOUND) {
            return _code;
        }

        if (OK != PendingManager(_manager).addTx(_txHash, msg.sig, address(this))) {
            revert();
        }

        return MULTISIG_ADDED;
    }

    function _isTxExistWithArgs(bytes32 _args, uint _block) internal view returns (bool) {
        bytes32 _txHash = _getKey(_args, _block);
        address _manager = getPendingManager();
        return PendingManager(_manager).isTxExist(_txHash);
    }

    function _getKey(bytes32 _args, uint _block) private view returns (bytes32 _txHash) {
        _block = _block != 0 ? _block : block.number;
        _txHash = keccak256(msg.sig, _args, _block);
    }
}



/// @title ServiceController
///
/// Base implementation
/// Serves for managing service instances
contract ServiceController is MultiSigAdapter {

    uint constant SERVICE_CONTROLLER = 350000;
    uint constant SERVICE_CONTROLLER_EMISSION_EXIST = SERVICE_CONTROLLER + 1;
    uint constant SERVICE_CONTROLLER_BURNING_MAN_EXIST = SERVICE_CONTROLLER + 2;
    uint constant SERVICE_CONTROLLER_ALREADY_INITIALIZED = SERVICE_CONTROLLER + 3;
    uint constant SERVICE_CONTROLLER_SERVICE_EXIST = SERVICE_CONTROLLER + 4;

    address public profiterole;
    address public treasury;
    address public pendingManager;
    address public proxy;

    mapping(address => bool) public sideServices;
    mapping(address => bool) emissionProviders;
    mapping(address => bool) burningMans;

    /// @notice Default ServiceController's constructor
    ///
    /// @param _pendingManager pending manager address
    /// @param _proxy ERC20 proxy address
    /// @param _profiterole profiterole address
    /// @param _treasury treasury address
    function ServiceController(address _pendingManager, address _proxy, address _profiterole, address _treasury) public {
        require(_pendingManager != 0x0);
        require(_proxy != 0x0);
        require(_profiterole != 0x0);
        require(_treasury != 0x0);
        pendingManager = _pendingManager;
        proxy = _proxy;
        profiterole = _profiterole;
        treasury = _treasury;
    }

    /// @notice Return pending manager address
    ///
    /// @return code
    function getPendingManager() public view returns (address) {
        return pendingManager;
    }

    /// @notice Add emission provider
    ///
    /// @param _provider emission provider address
    ///
    /// @return code
    function addEmissionProvider(address _provider, uint _block) public returns (uint _code) {
        if (emissionProviders[_provider]) {
            return SERVICE_CONTROLLER_EMISSION_EXIST;
        }
        _code = _multisig(keccak256(_provider), _block);
        if (OK != _code) {
            return _code;
        }

        emissionProviders[_provider] = true;
        return OK;
    }

    /// @notice Remove emission provider
    ///
    /// @param _provider emission provider address
    ///
    /// @return code
    function removeEmissionProvider(address _provider, uint _block) public returns (uint _code) {
        _code = _multisig(keccak256(_provider), _block);
        if (OK != _code) {
            return _code;
        }

        delete emissionProviders[_provider];
        return OK;
    }

    /// @notice Add burning man
    ///
    /// @param _burningMan burning man address
    ///
    /// @return code
    function addBurningMan(address _burningMan, uint _block) public returns (uint _code) {
        if (burningMans[_burningMan]) {
            return SERVICE_CONTROLLER_BURNING_MAN_EXIST;
        }

        _code = _multisig(keccak256(_burningMan), _block);
        if (OK != _code) {
            return _code;
        }

        burningMans[_burningMan] = true;
        return OK;
    }

    /// @notice Remove burning man
    ///
    /// @param _burningMan burning man address
    ///
    /// @return code
    function removeBurningMan(address _burningMan, uint _block) public returns (uint _code) {
        _code = _multisig(keccak256(_burningMan), _block);
        if (OK != _code) {
            return _code;
        }

        delete burningMans[_burningMan];
        return OK;
    }

    /// @notice Update a profiterole address
    ///
    /// @param _profiterole profiterole address
    ///
    /// @return result code of an operation
    function updateProfiterole(address _profiterole, uint _block) public returns (uint _code) {
        _code = _multisig(keccak256(_profiterole), _block);
        if (OK != _code) {
            return _code;
        }

        profiterole = _profiterole;
        return OK;
    }

    /// @notice Update a treasury address
    ///
    /// @param _treasury treasury address
    ///
    /// @return result code of an operation
    function updateTreasury(address _treasury, uint _block) public returns (uint _code) {
        _code = _multisig(keccak256(_treasury), _block);
        if (OK != _code) {
            return _code;
        }

        treasury = _treasury;
        return OK;
    }

    /// @notice Update pending manager address
    ///
    /// @param _pendingManager pending manager address
    ///
    /// @return result code of an operation
    function updatePendingManager(address _pendingManager, uint _block) public returns (uint _code) {
        _code = _multisig(keccak256(_pendingManager), _block);
        if (OK != _code) {
            return _code;
        }

        pendingManager = _pendingManager;
        return OK;
    }

    function addSideService(address _service, uint _block) public returns (uint _code) {
        if (sideServices[_service]) {
            return SERVICE_CONTROLLER_SERVICE_EXIST;
        }
        _code = _multisig(keccak256(_service), _block);
        if (OK != _code) {
            return _code;
        }

        sideServices[_service] = true;
        return OK;
    }

    function removeSideService(address _service, uint _block) public returns (uint _code) {
        _code = _multisig(keccak256(_service), _block);
        if (OK != _code) {
            return _code;
        }

        delete sideServices[_service];
        return OK;
    }

    /// @notice Check target address is service
    ///
    /// @param _address target address
    ///
    /// @return `true` when an address is a service, `false` otherwise
    function isService(address _address) public view returns (bool check) {
        return _address == profiterole ||
            _address == treasury || 
            _address == proxy || 
            _address == pendingManager || 
            emissionProviders[_address] || 
            burningMans[_address] ||
            sideServices[_address];
    }
}

contract OracleMethodAdapter is Object {

    event OracleAdded(bytes4 _sig, address _oracle);
    event OracleRemoved(bytes4 _sig, address _oracle);

    mapping(bytes4 => mapping(address => bool)) public oracles;

    /// @dev Allow access only for oracle
    modifier onlyOracle {
        if (oracles[msg.sig][msg.sender]) {
            _;
        }
    }

    modifier onlyOracleOrOwner {
        if (oracles[msg.sig][msg.sender] || msg.sender == contractOwner) {
            _;
        }
    }

    function addOracles(bytes4[] _signatures, address[] _oracles) onlyContractOwner external returns (uint) {
        require(_signatures.length == _oracles.length);
        bytes4 _sig;
        address _oracle;
        for (uint _idx = 0; _idx < _signatures.length; ++_idx) {
            (_sig, _oracle) = (_signatures[_idx], _oracles[_idx]);
            if (!oracles[_sig][_oracle]) {
                oracles[_sig][_oracle] = true;
                _emitOracleAdded(_sig, _oracle);
            }
        }
        return OK;
    }

    function removeOracles(bytes4[] _signatures, address[] _oracles) onlyContractOwner external returns (uint) {
        require(_signatures.length == _oracles.length);
        bytes4 _sig;
        address _oracle;
        for (uint _idx = 0; _idx < _signatures.length; ++_idx) {
            (_sig, _oracle) = (_signatures[_idx], _oracles[_idx]);
            if (oracles[_sig][_oracle]) {
                delete oracles[_sig][_oracle];
                _emitOracleRemoved(_sig, _oracle);
            }
        }
        return OK;
    }

    function _emitOracleAdded(bytes4 _sig, address _oracle) internal {
        OracleAdded(_sig, _oracle);
    }

    function _emitOracleRemoved(bytes4 _sig, address _oracle) internal {
        OracleRemoved(_sig, _oracle);
    }

}

contract Platform {
    mapping(bytes32 => address) public proxies;
    function name(bytes32 _symbol) public view returns (string);
    function setProxy(address _address, bytes32 _symbol) public returns (uint errorCode);
    function isOwner(address _owner, bytes32 _symbol) public view returns (bool);
    function totalSupply(bytes32 _symbol) public view returns (uint);
    function balanceOf(address _holder, bytes32 _symbol) public view returns (uint);
    function allowance(address _from, address _spender, bytes32 _symbol) public view returns (uint);
    function baseUnit(bytes32 _symbol) public view returns (uint8);
    function proxyTransferWithReference(address _to, uint _value, bytes32 _symbol, string _reference, address _sender) public returns (uint errorCode);
    function proxyTransferFromWithReference(address _from, address _to, uint _value, bytes32 _symbol, string _reference, address _sender) public returns (uint errorCode);
    function proxyApprove(address _spender, uint _value, bytes32 _symbol, address _sender) public returns (uint errorCode);
    function issueAsset(bytes32 _symbol, uint _value, string _name, string _description, uint8 _baseUnit, bool _isReissuable) public returns (uint errorCode);
    function reissueAsset(bytes32 _symbol, uint _value) public returns (uint errorCode);
    function revokeAsset(bytes32 _symbol, uint _value) public returns (uint errorCode);
    function isReissuable(bytes32 _symbol) public view returns (bool);
    function changeOwnership(bytes32 _symbol, address _newOwner) public returns (uint errorCode);
}


contract ATxAssetProxy is ERC20, Object, ServiceAllowance {

    // Timespan for users to review the new implementation and make decision.
    uint constant UPGRADE_FREEZE_TIME = 3 days;

    using SafeMath for uint;

    /**
     * Indicates an upgrade freeze-time start, and the next asset implementation contract.
     */
    event UpgradeProposal(address newVersion);

    // Current asset implementation contract address.
    address latestVersion;

    // Proposed next asset implementation contract address.
    address pendingVersion;

    // Upgrade freeze-time start.
    uint pendingVersionTimestamp;

    // Assigned platform, immutable.
    Platform public platform;

    // Assigned symbol, immutable.
    bytes32 public smbl;

    // Assigned name, immutable.
    string public name;

    /**
     * Only platform is allowed to call.
     */
    modifier onlyPlatform() {
        if (msg.sender == address(platform)) {
            _;
        }
    }

    /**
     * Only current asset owner is allowed to call.
     */
    modifier onlyAssetOwner() {
        if (platform.isOwner(msg.sender, smbl)) {
            _;
        }
    }

    /**
     * Only asset implementation contract assigned to sender is allowed to call.
     */
    modifier onlyAccess(address _sender) {
        if (getLatestVersion() == msg.sender) {
            _;
        }
    }

    /**
     * Resolves asset implementation contract for the caller and forwards there transaction data,
     * along with the value. This allows for proxy interface growth.
     */
    function() public payable {
        _getAsset().__process.value(msg.value)(msg.data, msg.sender);
    }

    /**
     * Sets platform address, assigns symbol and name.
     *
     * Can be set only once.
     *
     * @param _platform platform contract address.
     * @param _symbol assigned symbol.
     * @param _name assigned name.
     *
     * @return success.
     */
    function init(Platform _platform, string _symbol, string _name) public returns (bool) {
        if (address(platform) != 0x0) {
            return false;
        }
        platform = _platform;
        symbol = _symbol;
        smbl = stringToBytes32(_symbol);
        name = _name;
        return true;
    }

    /**
     * Returns asset total supply.
     *
     * @return asset total supply.
     */
    function totalSupply() public view returns (uint) {
        return platform.totalSupply(smbl);
    }

    /**
     * Returns asset balance for a particular holder.
     *
     * @param _owner holder address.
     *
     * @return holder balance.
     */
    function balanceOf(address _owner) public view returns (uint) {
        return platform.balanceOf(_owner, smbl);
    }

    /**
     * Returns asset allowance from one holder to another.
     *
     * @param _from holder that allowed spending.
     * @param _spender holder that is allowed to spend.
     *
     * @return holder to spender allowance.
     */
    function allowance(address _from, address _spender) public view returns (uint) {
        return platform.allowance(_from, _spender, smbl);
    }

    /**
     * Returns asset decimals.
     *
     * @return asset decimals.
     */
    function decimals() public view returns (uint8) {
        return platform.baseUnit(smbl);
    }

    /**
     * Transfers asset balance from the caller to specified receiver.
     *
     * @param _to holder address to give to.
     * @param _value amount to transfer.
     *
     * @return success.
     */
    function transfer(address _to, uint _value) public returns (bool) {
        if (_to != 0x0) {
            return _transferWithReference(_to, _value, "");
        }
        else {
            return false;
        }
    }

    /**
     * Transfers asset balance from the caller to specified receiver adding specified comment.
     *
     * @param _to holder address to give to.
     * @param _value amount to transfer.
     * @param _reference transfer comment to be included in a platform's Transfer event.
     *
     * @return success.
     */
    function transferWithReference(address _to, uint _value, string _reference) public returns (bool) {
        if (_to != 0x0) {
            return _transferWithReference(_to, _value, _reference);
        }
        else {
            return false;
        }
    }

    /**
     * Performs transfer call on the platform by the name of specified sender.
     *
     * Can only be called by asset implementation contract assigned to sender.
     *
     * @param _to holder address to give to.
     * @param _value amount to transfer.
     * @param _reference transfer comment to be included in a platform's Transfer event.
     * @param _sender initial caller.
     *
     * @return success.
     */
    function __transferWithReference(address _to, uint _value, string _reference, address _sender) public onlyAccess(_sender) returns (bool) {
        return platform.proxyTransferWithReference(_to, _value, smbl, _reference, _sender) == OK;
    }

    /**
     * Prforms allowance transfer of asset balance between holders.
     *
     * @param _from holder address to take from.
     * @param _to holder address to give to.
     * @param _value amount to transfer.
     *
     * @return success.
     */
    function transferFrom(address _from, address _to, uint _value) public returns (bool) {
        if (_to != 0x0) {
            return _getAsset().__transferFromWithReference(_from, _to, _value, "", msg.sender);
        }
        else {
            return false;
        }
    }

    /**
     * Performs allowance transfer call on the platform by the name of specified sender.
     *
     * Can only be called by asset implementation contract assigned to sender.
     *
     * @param _from holder address to take from.
     * @param _to holder address to give to.
     * @param _value amount to transfer.
     * @param _reference transfer comment to be included in a platform's Transfer event.
     * @param _sender initial caller.
     *
     * @return success.
     */
    function __transferFromWithReference(address _from, address _to, uint _value, string _reference, address _sender) public onlyAccess(_sender) returns (bool) {
        return platform.proxyTransferFromWithReference(_from, _to, _value, smbl, _reference, _sender) == OK;
    }

    /**
     * Sets asset spending allowance for a specified spender.
     *
     * @param _spender holder address to set allowance to.
     * @param _value amount to allow.
     *
     * @return success.
     */
    function approve(address _spender, uint _value) public returns (bool) {
        if (_spender != 0x0) {
            return _getAsset().__approve(_spender, _value, msg.sender);
        }
        else {
            return false;
        }
    }

    /**
     * Performs allowance setting call on the platform by the name of specified sender.
     *
     * Can only be called by asset implementation contract assigned to sender.
     *
     * @param _spender holder address to set allowance to.
     * @param _value amount to allow.
     * @param _sender initial caller.
     *
     * @return success.
     */
    function __approve(address _spender, uint _value, address _sender) public onlyAccess(_sender) returns (bool) {
        return platform.proxyApprove(_spender, _value, smbl, _sender) == OK;
    }

    /**
     * Emits ERC20 Transfer event on this contract.
     *
     * Can only be, and, called by assigned platform when asset transfer happens.
     */
    function emitTransfer(address _from, address _to, uint _value) public onlyPlatform() {
        Transfer(_from, _to, _value);
    }

    /**
     * Emits ERC20 Approval event on this contract.
     *
     * Can only be, and, called by assigned platform when asset allowance set happens.
     */
    function emitApprove(address _from, address _spender, uint _value) public onlyPlatform() {
        Approval(_from, _spender, _value);
    }

    /**
     * Returns current asset implementation contract address.
     *
     * @return asset implementation contract address.
     */
    function getLatestVersion() public view returns (address) {
        return latestVersion;
    }

    /**
     * Returns proposed next asset implementation contract address.
     *
     * @return asset implementation contract address.
     */
    function getPendingVersion() public view returns (address) {
        return pendingVersion;
    }

    /**
     * Returns upgrade freeze-time start.
     *
     * @return freeze-time start.
     */
    function getPendingVersionTimestamp() public view returns (uint) {
        return pendingVersionTimestamp;
    }

    /**
     * Propose next asset implementation contract address.
     *
     * Can only be called by current asset owner.
     *
     * Note: freeze-time should not be applied for the initial setup.
     *
     * @param _newVersion asset implementation contract address.
     *
     * @return success.
     */
    function proposeUpgrade(address _newVersion) public onlyAssetOwner returns (bool) {
        // Should not already be in the upgrading process.
        if (pendingVersion != 0x0) {
            return false;
        }
        // New version address should be other than 0x0.
        if (_newVersion == 0x0) {
            return false;
        }
        // Don't apply freeze-time for the initial setup.
        if (latestVersion == 0x0) {
            latestVersion = _newVersion;
            return true;
        }
        pendingVersion = _newVersion;
        pendingVersionTimestamp = now;
        UpgradeProposal(_newVersion);
        return true;
    }

    /**
     * Cancel the pending upgrade process.
     *
     * Can only be called by current asset owner.
     *
     * @return success.
     */
    function purgeUpgrade() public onlyAssetOwner returns (bool) {
        if (pendingVersion == 0x0) {
            return false;
        }
        delete pendingVersion;
        delete pendingVersionTimestamp;
        return true;
    }

    /**
     * Finalize an upgrade process setting new asset implementation contract address.
     *
     * Can only be called after an upgrade freeze-time.
     *
     * @return success.
     */
    function commitUpgrade() public returns (bool) {
        if (pendingVersion == 0x0) {
            return false;
        }
        if (pendingVersionTimestamp.add(UPGRADE_FREEZE_TIME) > now) {
            return false;
        }
        latestVersion = pendingVersion;
        delete pendingVersion;
        delete pendingVersionTimestamp;
        return true;
    }

    function isTransferAllowed(address, address, address, address, uint) public view returns (bool) {
        return true;
    }

    /**
     * Returns asset implementation contract for current caller.
     *
     * @return asset implementation contract.
     */
    function _getAsset() internal view returns (ATxAssetInterface) {
        return ATxAssetInterface(getLatestVersion());
    }

    /**
     * Resolves asset implementation contract for the caller and forwards there arguments along with
     * the caller address.
     *
     * @return success.
     */
    function _transferWithReference(address _to, uint _value, string _reference) internal returns (bool) {
        return _getAsset().__transferWithReference(_to, _value, _reference, msg.sender);
    }

    function stringToBytes32(string memory source) private pure returns (bytes32 result) {
        assembly {
            result := mload(add(source, 32))
        }
    }
}

contract DataControllerEmitter {

    event CountryCodeAdded(uint _countryCode, uint _countryId, uint _maxHolderCount);
    event CountryCodeChanged(uint _countryCode, uint _countryId, uint _maxHolderCount);

    event HolderRegistered(bytes32 _externalHolderId, uint _accessIndex, uint _countryCode);
    event HolderAddressAdded(bytes32 _externalHolderId, address _holderPrototype, uint _accessIndex);
    event HolderAddressRemoved(bytes32 _externalHolderId, address _holderPrototype, uint _accessIndex);
    event HolderOperationalChanged(bytes32 _externalHolderId, bool _operational);

    event DayLimitChanged(bytes32 _externalHolderId, uint _from, uint _to);
    event MonthLimitChanged(bytes32 _externalHolderId, uint _from, uint _to);

    event Error(uint _errorCode);

    function _emitHolderAddressAdded(bytes32 _externalHolderId, address _holderPrototype, uint _accessIndex) internal {
        HolderAddressAdded(_externalHolderId, _holderPrototype, _accessIndex);
    }

    function _emitHolderAddressRemoved(bytes32 _externalHolderId, address _holderPrototype, uint _accessIndex) internal {
        HolderAddressRemoved(_externalHolderId, _holderPrototype, _accessIndex);
    }

    function _emitHolderRegistered(bytes32 _externalHolderId, uint _accessIndex, uint _countryCode) internal {
        HolderRegistered(_externalHolderId, _accessIndex, _countryCode);
    }

    function _emitHolderOperationalChanged(bytes32 _externalHolderId, bool _operational) internal {
        HolderOperationalChanged(_externalHolderId, _operational);
    }

    function _emitCountryCodeAdded(uint _countryCode, uint _countryId, uint _maxHolderCount) internal {
        CountryCodeAdded(_countryCode, _countryId, _maxHolderCount);
    }

    function _emitCountryCodeChanged(uint _countryCode, uint _countryId, uint _maxHolderCount) internal {
        CountryCodeChanged(_countryCode, _countryId, _maxHolderCount);
    }

    function _emitDayLimitChanged(bytes32 _externalHolderId, uint _from, uint _to) internal {
        DayLimitChanged(_externalHolderId, _from, _to);
    }

    function _emitMonthLimitChanged(bytes32 _externalHolderId, uint _from, uint _to) internal {
        MonthLimitChanged(_externalHolderId, _from, _to);
    }

    function _emitError(uint _errorCode) internal returns (uint) {
        Error(_errorCode);
        return _errorCode;
    }
}


/// @title Provides possibility manage holders? country limits and limits for holders.
contract DataController is OracleMethodAdapter, DataControllerEmitter {

    /* CONSTANTS */

    uint constant DATA_CONTROLLER = 109000;
    uint constant DATA_CONTROLLER_ERROR = DATA_CONTROLLER + 1;
    uint constant DATA_CONTROLLER_CURRENT_WRONG_LIMIT = DATA_CONTROLLER + 2;
    uint constant DATA_CONTROLLER_WRONG_ALLOWANCE = DATA_CONTROLLER + 3;
    uint constant DATA_CONTROLLER_COUNTRY_CODE_ALREADY_EXISTS = DATA_CONTROLLER + 4;

    uint constant MAX_TOKEN_HOLDER_NUMBER = 2 ** 256 - 1;

    using SafeMath for uint;

    /* STRUCTS */

    /// @title HoldersData couldn't be public because of internal structures, so needed to provide getters for different parts of _holderData
    struct HoldersData {
        uint countryCode;
        uint sendLimPerDay;
        uint sendLimPerMonth;
        bool operational;
        bytes text;
        uint holderAddressCount;
        mapping(uint => address) index2Address;
        mapping(address => uint) address2Index;
    }

    struct CountryLimits {
        uint countryCode;
        uint maxTokenHolderNumber;
        uint currentTokenHolderNumber;
    }

    /* FIELDS */

    address public withdrawal;
    address assetAddress;
    address public serviceController;

    mapping(address => uint) public allowance;

    // Iterable mapping pattern is used for holders.
    /// @dev This is an access address mapping. Many addresses may have access to a single holder.
    uint public holdersCount;
    mapping(uint => HoldersData) holders;
    mapping(address => bytes32) holderAddress2Id;
    mapping(bytes32 => uint) public holderIndex;

    // This is an access address mapping. Many addresses may have access to a single holder.
    uint public countriesCount;
    mapping(uint => CountryLimits) countryLimitsList;
    mapping(uint => uint) countryIndex;

    /* MODIFIERS */

    modifier onlyWithdrawal {
        if (msg.sender != withdrawal) {
            revert();
        }
        _;
    }

    modifier onlyAsset {
        if (msg.sender == assetAddress) {
            _;
        }
    }

    modifier onlyContractOwner {
        if (msg.sender == contractOwner) {
            _;
        }
    }

    /// @notice Constructor for _holderData controller.
    /// @param _serviceController service controller
    function DataController(address _serviceController, address _asset) public {
        require(_serviceController != 0x0);
        require(_asset != 0x0);

        serviceController = _serviceController;
        assetAddress = _asset;
    }

    function() payable public {
        revert();
    }

    function setWithdraw(address _withdrawal) onlyContractOwner external returns (uint) {
        require(_withdrawal != 0x0);
        withdrawal = _withdrawal;
        return OK;
    }


    function getPendingManager() public view returns (address) {
        return ServiceController(serviceController).getPendingManager();
    }

    function getHolderInfo(bytes32 _externalHolderId) public view returns (
        uint _countryCode,
        uint _limPerDay,
        uint _limPerMonth,
        bool _operational,
        bytes _text
    ) {
        HoldersData storage _data = holders[holderIndex[_externalHolderId]];
        return (_data.countryCode, _data.sendLimPerDay, _data.sendLimPerMonth, _data.operational, _data.text);
    }

    function getHolderAddresses(bytes32 _externalHolderId) public view returns (address[] _addresses) {
        HoldersData storage _holderData = holders[holderIndex[_externalHolderId]];
        uint _addressesCount = _holderData.holderAddressCount;
        _addresses = new address[](_addressesCount);
        for (uint _holderAddressIdx = 0; _holderAddressIdx < _addressesCount; ++_holderAddressIdx) {
            _addresses[_holderAddressIdx] = _holderData.index2Address[_holderAddressIdx + 1];
        }
    }

    function getHolderCountryCode(bytes32 _externalHolderId) public view returns (uint) {
        return holders[holderIndex[_externalHolderId]].countryCode;
    }

    function getHolderExternalIdByAddress(address _address) public view returns (bytes32) {
        return holderAddress2Id[_address];
    }

    /// @notice Checks user is holder.
    /// @param _address checking address.
    /// @return `true` if _address is registered holder, `false` otherwise.
    function isRegisteredAddress(address _address) public view returns (bool) {
        return holderIndex[holderAddress2Id[_address]] != 0;
    }

    function isHolderOwnAddress(bytes32 _externalHolderId, address _address) public view returns (bool) {
        uint _holderIndex = holderIndex[_externalHolderId];
        if (_holderIndex == 0) {
            return false;
        }
        return holders[_holderIndex].address2Index[_address] != 0;
    }

    function getCountryInfo(uint _countryCode) public view returns (uint _maxHolderNumber, uint _currentHolderCount) {
        CountryLimits storage _data = countryLimitsList[countryIndex[_countryCode]];
        return (_data.maxTokenHolderNumber, _data.currentTokenHolderNumber);
    }

    function getCountryLimit(uint _countryCode) public view returns (uint limit) {
        uint _index = countryIndex[_countryCode];
        require(_index != 0);
        return countryLimitsList[_index].maxTokenHolderNumber;
    }

    function addCountryCode(uint _countryCode) onlyContractOwner public returns (uint) {
        var (,_created) = _createCountryId(_countryCode);
        if (!_created) {
            return _emitError(DATA_CONTROLLER_COUNTRY_CODE_ALREADY_EXISTS);
        }
        return OK;
    }

    /// @notice Returns holder id for the specified address, creates it if needed.
    /// @param _externalHolderId holder address.
    /// @param _countryCode country code.
    /// @return error code.
    function registerHolder(bytes32 _externalHolderId, address _holderAddress, uint _countryCode) onlyOracleOrOwner external returns (uint) {
        require(_holderAddress != 0x0);
        uint _holderIndex = holderIndex[holderAddress2Id[_holderAddress]];
        require(_holderIndex == 0);

        _createCountryId(_countryCode);
        _holderIndex = holdersCount.add(1);
        holdersCount = _holderIndex;

        HoldersData storage _holderData = holders[_holderIndex];
        _holderData.countryCode = _countryCode;
        _holderData.operational = true;
        _holderData.sendLimPerDay = MAX_TOKEN_HOLDER_NUMBER;
        _holderData.sendLimPerMonth = MAX_TOKEN_HOLDER_NUMBER;
        uint _firstAddressIndex = 1;
        _holderData.holderAddressCount = _firstAddressIndex;
        _holderData.address2Index[_holderAddress] = _firstAddressIndex;
        _holderData.index2Address[_firstAddressIndex] = _holderAddress;
        holderIndex[_externalHolderId] = _holderIndex;
        holderAddress2Id[_holderAddress] = _externalHolderId;

        _emitHolderRegistered(_externalHolderId, _holderIndex, _countryCode);
        return OK;
    }

    /// @notice Adds new address equivalent to holder.
    /// @param _externalHolderId external holder identifier.
    /// @param _newAddress adding address.
    /// @return error code.
    function addHolderAddress(bytes32 _externalHolderId, address _newAddress) onlyOracleOrOwner external returns (uint) {
        uint _holderIndex = holderIndex[_externalHolderId];
        require(_holderIndex != 0);

        uint _newAddressId = holderIndex[holderAddress2Id[_newAddress]];
        require(_newAddressId == 0);

        HoldersData storage _holderData = holders[_holderIndex];

        if (_holderData.address2Index[_newAddress] == 0) {
            _holderData.holderAddressCount = _holderData.holderAddressCount.add(1);
            _holderData.address2Index[_newAddress] = _holderData.holderAddressCount;
            _holderData.index2Address[_holderData.holderAddressCount] = _newAddress;
        }

        holderAddress2Id[_newAddress] = _externalHolderId;

        _emitHolderAddressAdded(_externalHolderId, _newAddress, _holderIndex);
        return OK;
    }

    /// @notice Remove an address owned by a holder.
    /// @param _externalHolderId external holder identifier.
    /// @param _address removing address.
    /// @return error code.
    function removeHolderAddress(bytes32 _externalHolderId, address _address) onlyOracleOrOwner external returns (uint) {
        uint _holderIndex = holderIndex[_externalHolderId];
        require(_holderIndex != 0);

        HoldersData storage _holderData = holders[_holderIndex];

        uint _tempIndex = _holderData.address2Index[_address];
        require(_tempIndex != 0);

        address _lastAddress = _holderData.index2Address[_holderData.holderAddressCount];
        _holderData.address2Index[_lastAddress] = _tempIndex;
        _holderData.index2Address[_tempIndex] = _lastAddress;
        delete _holderData.address2Index[_address];
        _holderData.holderAddressCount = _holderData.holderAddressCount.sub(1);

        delete holderAddress2Id[_address];

        _emitHolderAddressRemoved(_externalHolderId, _address, _holderIndex);
        return OK;
    }

    /// @notice Change operational status for holder.
    /// Can be accessed by contract owner or oracle only.
    ///
    /// @param _externalHolderId external holder identifier.
    /// @param _operational operational status.
    ///
    /// @return result code.
    function changeOperational(bytes32 _externalHolderId, bool _operational) onlyOracleOrOwner external returns (uint) {
        uint _holderIndex = holderIndex[_externalHolderId];
        require(_holderIndex != 0);

        holders[_holderIndex].operational = _operational;

        _emitHolderOperationalChanged(_externalHolderId, _operational);
        return OK;
    }

    /// @notice Changes text for holder.
    /// Can be accessed by contract owner or oracle only.
    ///
    /// @param _externalHolderId external holder identifier.
    /// @param _text changing text.
    ///
    /// @return result code.
    function updateTextForHolder(bytes32 _externalHolderId, bytes _text) onlyOracleOrOwner external returns (uint) {
        uint _holderIndex = holderIndex[_externalHolderId];
        require(_holderIndex != 0);

        holders[_holderIndex].text = _text;
        return OK;
    }

    /// @notice Updates limit per day for holder.
    ///
    /// Can be accessed by contract owner only.
    ///
    /// @param _externalHolderId external holder identifier.
    /// @param _limit limit value.
    ///
    /// @return result code.
    function updateLimitPerDay(bytes32 _externalHolderId, uint _limit) onlyOracleOrOwner external returns (uint) {
        uint _holderIndex = holderIndex[_externalHolderId];
        require(_holderIndex != 0);

        uint _currentLimit = holders[_holderIndex].sendLimPerDay;
        holders[_holderIndex].sendLimPerDay = _limit;

        _emitDayLimitChanged(_externalHolderId, _currentLimit, _limit);
        return OK;
    }

    /// @notice Updates limit per month for holder.
    /// Can be accessed by contract owner or oracle only.
    ///
    /// @param _externalHolderId external holder identifier.
    /// @param _limit limit value.
    ///
    /// @return result code.
    function updateLimitPerMonth(bytes32 _externalHolderId, uint _limit) onlyOracleOrOwner external returns (uint) {
        uint _holderIndex = holderIndex[_externalHolderId];
        require(_holderIndex != 0);

        uint _currentLimit = holders[_holderIndex].sendLimPerDay;
        holders[_holderIndex].sendLimPerMonth = _limit;

        _emitMonthLimitChanged(_externalHolderId, _currentLimit, _limit);
        return OK;
    }

    /// @notice Change country limits.
    /// Can be accessed by contract owner or oracle only.
    ///
    /// @param _countryCode country code.
    /// @param _limit limit value.
    ///
    /// @return result code.
    function changeCountryLimit(uint _countryCode, uint _limit) onlyOracleOrOwner external returns (uint) {
        uint _countryIndex = countryIndex[_countryCode];
        require(_countryIndex != 0);

        uint _currentTokenHolderNumber = countryLimitsList[_countryIndex].currentTokenHolderNumber;
        if (_currentTokenHolderNumber > _limit) {
            return DATA_CONTROLLER_CURRENT_WRONG_LIMIT;
        }

        countryLimitsList[_countryIndex].maxTokenHolderNumber = _limit;
        
        _emitCountryCodeChanged(_countryIndex, _countryCode, _limit);
        return OK;
    }

    function withdrawFrom(address _holderAddress, uint _value) public onlyAsset returns (uint) {
        bytes32 _externalHolderId = holderAddress2Id[_holderAddress];
        HoldersData storage _holderData = holders[holderIndex[_externalHolderId]];
        _holderData.sendLimPerDay = _holderData.sendLimPerDay.sub(_value);
        _holderData.sendLimPerMonth = _holderData.sendLimPerMonth.sub(_value);
        return OK;
    }

    function depositTo(address _holderAddress, uint _value) public onlyAsset returns (uint) {
        bytes32 _externalHolderId = holderAddress2Id[_holderAddress];
        HoldersData storage _holderData = holders[holderIndex[_externalHolderId]];
        _holderData.sendLimPerDay = _holderData.sendLimPerDay.add(_value);
        _holderData.sendLimPerMonth = _holderData.sendLimPerMonth.add(_value);
        return OK;
    }

    function updateCountryHoldersCount(uint _countryCode, uint _updatedHolderCount) public onlyAsset returns (uint) {
        CountryLimits storage _data = countryLimitsList[countryIndex[_countryCode]];
        assert(_data.maxTokenHolderNumber >= _updatedHolderCount);
        _data.currentTokenHolderNumber = _updatedHolderCount;
        return OK;
    }

    function changeAllowance(address _from, uint _value) public onlyWithdrawal returns (uint) {
        ServiceController _serviceController = ServiceController(serviceController);
        ATxAssetProxy token = ATxAssetProxy(_serviceController.proxy());
        if (token.balanceOf(_from) < _value) {
            return DATA_CONTROLLER_WRONG_ALLOWANCE;
        }
        allowance[_from] = _value;
        return OK;
    }

    function _createCountryId(uint _countryCode) internal returns (uint, bool _created) {
        uint countryId = countryIndex[_countryCode];
        if (countryId == 0) {
            uint _countriesCount = countriesCount;
            countryId = _countriesCount.add(1);
            countriesCount = countryId;
            CountryLimits storage limits = countryLimitsList[countryId];
            limits.countryCode = _countryCode;
            limits.maxTokenHolderNumber = MAX_TOKEN_HOLDER_NUMBER;

            countryIndex[_countryCode] = countryId;
            _emitCountryCodeAdded(countryIndex[_countryCode], _countryCode, MAX_TOKEN_HOLDER_NUMBER);

            _created = true;
        }

        return (countryId, _created);
    }
}

/// @title Contract that will work with ERC223 tokens.
interface ERC223ReceivingInterface {

	/// @notice Standard ERC223 function that will handle incoming token transfers.
	/// @param _from  Token sender address.
	/// @param _value Amount of tokens.
	/// @param _data  Transaction metadata.
    function tokenFallback(address _from, uint _value, bytes _data) external;
}

/// @title ATx Asset implementation contract.
///
/// Basic asset implementation contract, without any additional logic.
/// Every other asset implementation contracts should derive from this one.
/// Receives calls from the proxy, and calls back immediately without arguments modification.
///
/// Note: all the non constant functions return false instead of throwing in case if state change
/// didn't happen yet.
contract ATxAsset is BasicAsset, Owned {

    uint public constant OK = 1;

    using SafeMath for uint;

    enum Roles {
        Holder,
        Service,
        Other
    }

    ServiceController public serviceController;
    DataController public dataController;
    uint public lockupDate;

    /// @notice Default constructor for ATxAsset.
    function ATxAsset() public {
    }

    function() payable public {
        revert();
    }

    /// @notice Init function for ATxAsset.
    ///
    /// @param _proxy - atx asset proxy.
    /// @param _serviceController - service controoler.
    /// @param _dataController - data controller.
    /// @param _lockupDate - th lockup date.
    function initAtx(
        address _proxy, 
        address _serviceController, 
        address _dataController, 
        uint _lockupDate
    ) 
    onlyContractOwner 
    public 
    returns (bool) 
    {
        require(_serviceController != 0x0);
        require(_dataController != 0x0);
        require(_proxy != 0x0);
        require(_lockupDate > now || _lockupDate == 0);

        if (!super.init(ATxProxy(_proxy))) {
            return false;
        }

        serviceController = ServiceController(_serviceController);
        dataController = DataController(_dataController);
        lockupDate = _lockupDate;
        return true;
    }

    /// @notice Performs transfer call on the platform by the name of specified sender.
    ///
    /// @dev Can only be called by proxy asset.
    ///
    /// @param _to holder address to give to.
    /// @param _value amount to transfer.
    /// @param _reference transfer comment to be included in a platform's Transfer event.
    /// @param _sender initial caller.
    ///
    /// @return success.
    function __transferWithReference(
        address _to, 
        uint _value, 
        string _reference, 
        address _sender
    ) 
    onlyProxy 
    public 
    returns (bool) 
    {
        var (_fromRole, _toRole) = _getParticipantRoles(_sender, _to);

        if (!_checkTransferAllowance(_to, _toRole, _value, _sender, _fromRole)) {
            return false;
        }

        if (!_isValidCountryLimits(_to, _toRole, _value, _sender, _fromRole)) {
            return false;
        }

        if (!super.__transferWithReference(_to, _value, _reference, _sender)) {
            return false;
        }

        _updateTransferLimits(_to, _toRole, _value, _sender, _fromRole);
        _contractFallbackERC223(_sender, _to, _value);

        return true;
    }

    /// @notice Performs allowance transfer call on the platform by the name of specified sender.
    ///
    /// @dev Can only be called by proxy asset.
    ///
    /// @param _from holder address to take from.
    /// @param _to holder address to give to.
    /// @param _value amount to transfer.
    /// @param _reference transfer comment to be included in a platform's Transfer event.
    /// @param _sender initial caller.
    ///
    /// @return success.
    function __transferFromWithReference(
        address _from, 
        address _to, 
        uint _value, 
        string _reference, 
        address _sender
    ) 
    public 
    onlyProxy 
    returns (bool) 
    {
        var (_fromRole, _toRole) = _getParticipantRoles(_from, _to);

        // @note Special check for operational withdraw.
        bool _isTransferFromHolderToContractOwner = (_fromRole == Roles.Holder) && 
            (contractOwner == _to) && 
            (dataController.allowance(_from) >= _value) && 
            super.__transferFromWithReference(_from, _to, _value, _reference, _sender);
        if (_isTransferFromHolderToContractOwner) {
            return true;
        }

        if (!_checkTransferAllowanceFrom(_to, _toRole, _value, _from, _fromRole, _sender)) {
            return false;
        }

        if (!_isValidCountryLimits(_to, _toRole, _value, _from, _fromRole)) {
            return false;
        }

        if (!super.__transferFromWithReference(_from, _to, _value, _reference, _sender)) {
            return false;
        }

        _updateTransferLimits(_to, _toRole, _value, _from, _fromRole);
        _contractFallbackERC223(_from, _to, _value);

        return true;
    }

    /* INTERNAL */

    function _contractFallbackERC223(address _from, address _to, uint _value) internal {
        uint _codeLength;
        assembly {
            _codeLength := extcodesize(_to)
        }

        if (_codeLength > 0) {
            ERC223ReceivingInterface _receiver = ERC223ReceivingInterface(_to);
            bytes memory _empty;
            _receiver.tokenFallback(_from, _value, _empty);
        }
    }

    function _isTokenActive() internal view returns (bool) {
        return now > lockupDate;
    }

    function _checkTransferAllowance(address _to, Roles _toRole, uint _value, address _from, Roles _fromRole) internal view returns (bool) {
        if (_to == proxy) {
            return false;
        }

        bool _canTransferFromService = _fromRole == Roles.Service && ServiceAllowance(_from).isTransferAllowed(_from, _to, _from, proxy, _value);
        bool _canTransferToService = _toRole == Roles.Service && ServiceAllowance(_to).isTransferAllowed(_from, _to, _from, proxy, _value);
        bool _canTransferToHolder = _toRole == Roles.Holder && _couldDepositToHolder(_to, _value);

        bool _canTransferFromHolder;

        if (_isTokenActive()) {
            _canTransferFromHolder = _fromRole == Roles.Holder && _couldWithdrawFromHolder(_from, _value);
        } else {
            _canTransferFromHolder = _fromRole == Roles.Holder && _couldWithdrawFromHolder(_from, _value) && _from == contractOwner;
        }

        return (_canTransferFromHolder || _canTransferFromService) && (_canTransferToHolder || _canTransferToService);
    }

    function _checkTransferAllowanceFrom(
        address _to, 
        Roles _toRole, 
        uint _value, 
        address _from, 
        Roles _fromRole, 
        address
    ) 
    internal 
    view 
    returns (bool) 
    {
        return _checkTransferAllowance(_to, _toRole, _value, _from, _fromRole);
    }

    function _isValidWithdrawLimits(uint _sendLimPerDay, uint _sendLimPerMonth, uint _value) internal pure returns (bool) {
        return !(_value > _sendLimPerDay || _value > _sendLimPerMonth);
    }

    function _isValidDepositCountry(
        uint _value,
        uint _withdrawCountryCode,
        uint _withdrawBalance,
        uint _countryCode,
        uint _balance,
        uint _currentHolderCount,
        uint _maxHolderNumber
    )
    internal
    pure
    returns (bool)
    {
        return _isNoNeedInCountryLimitChange(_value, _withdrawCountryCode, _withdrawBalance, _countryCode, _balance, _currentHolderCount, _maxHolderNumber)
        ? true
        : _isValidDepositCountry(_balance, _currentHolderCount, _maxHolderNumber);
    }

    function _isNoNeedInCountryLimitChange(
        uint _value,
        uint _withdrawCountryCode,
        uint _withdrawBalance,
        uint _countryCode,
        uint _balance,
        uint _currentHolderCount,
        uint _maxHolderNumber
    )
    internal
    pure
    returns (bool)
    {
        bool _needToIncrementCountryHolderCount = _balance == 0;
        bool _needToDecrementCountryHolderCount = _withdrawBalance == _value;
        bool _shouldOverflowCountryHolderCount = _currentHolderCount == _maxHolderNumber;

        return _withdrawCountryCode == _countryCode && _needToDecrementCountryHolderCount && _needToIncrementCountryHolderCount && _shouldOverflowCountryHolderCount;
    }

    function _updateCountries(
        uint _value,
        uint _withdrawCountryCode,
        uint _withdrawBalance,
        uint _withdrawCurrentHolderCount,
        uint _countryCode,
        uint _balance,
        uint _currentHolderCount,
        uint _maxHolderNumber
    )
    internal
    {
        if (_isNoNeedInCountryLimitChange(_value, _withdrawCountryCode, _withdrawBalance, _countryCode, _balance, _currentHolderCount, _maxHolderNumber)) {
            return;
        }

        _updateWithdrawCountry(_value, _withdrawCountryCode, _withdrawBalance, _withdrawCurrentHolderCount);
        _updateDepositCountry(_countryCode, _balance, _currentHolderCount);
    }

    function _updateWithdrawCountry(
        uint _value,
        uint _countryCode,
        uint _balance,
        uint _currentHolderCount
    )
    internal
    {
        if (_value == _balance && OK != dataController.updateCountryHoldersCount(_countryCode, _currentHolderCount.sub(1))) {
            revert();
        }
    }

    function _updateDepositCountry(
        uint _countryCode,
        uint _balance,
        uint _currentHolderCount
    )
    internal
    {
        if (_balance == 0 && OK != dataController.updateCountryHoldersCount(_countryCode, _currentHolderCount.add(1))) {
            revert();
        }
    }

    function _getParticipantRoles(address _from, address _to) private view returns (Roles _fromRole, Roles _toRole) {
        _fromRole = dataController.isRegisteredAddress(_from) ? Roles.Holder : (serviceController.isService(_from) ? Roles.Service : Roles.Other);
        _toRole = dataController.isRegisteredAddress(_to) ? Roles.Holder : (serviceController.isService(_to) ? Roles.Service : Roles.Other);
    }

    function _couldWithdrawFromHolder(address _holder, uint _value) private view returns (bool) {
        bytes32 _holderId = dataController.getHolderExternalIdByAddress(_holder);
        var (, _limPerDay, _limPerMonth, _operational,) = dataController.getHolderInfo(_holderId);
        return _operational ? _isValidWithdrawLimits(_limPerDay, _limPerMonth, _value) : false;
    }

    function _couldDepositToHolder(address _holder, uint) private view returns (bool) {
        bytes32 _holderId = dataController.getHolderExternalIdByAddress(_holder);
        var (,,, _operational,) = dataController.getHolderInfo(_holderId);
        return _operational;
    }

    //TODO need additional check: not clear check of country limit:
    function _isValidDepositCountry(uint _balance, uint _currentHolderCount, uint _maxHolderNumber) private pure returns (bool) {
        return !(_balance == 0 && _currentHolderCount == _maxHolderNumber);
    }

    function _getHoldersInfo(address _to, Roles _toRole, uint, address _from, Roles _fromRole)
    private
    view
    returns (
        uint _fromCountryCode,
        uint _fromBalance,
        uint _toCountryCode,
        uint _toCountryCurrentHolderCount,
        uint _toCountryMaxHolderNumber,
        uint _toBalance
    ) {
        bytes32 _holderId;
        if (_toRole == Roles.Holder) {
            _holderId = dataController.getHolderExternalIdByAddress(_to);
            _toCountryCode = dataController.getHolderCountryCode(_holderId);
            (_toCountryCurrentHolderCount, _toCountryMaxHolderNumber) = dataController.getCountryInfo(_toCountryCode);
            _toBalance = ERC20Interface(proxy).balanceOf(_to);
        }

        if (_fromRole == Roles.Holder) {
            _holderId = dataController.getHolderExternalIdByAddress(_from);
            _fromCountryCode = dataController.getHolderCountryCode(_holderId);
            _fromBalance = ERC20Interface(proxy).balanceOf(_from);
        }
    }

    function _isValidCountryLimits(address _to, Roles _toRole, uint _value, address _from, Roles _fromRole) private view returns (bool) {
        var (
        _fromCountryCode,
        _fromBalance,
        _toCountryCode,
        _toCountryCurrentHolderCount,
        _toCountryMaxHolderNumber,
        _toBalance
        ) = _getHoldersInfo(_to, _toRole, _value, _from, _fromRole);

        //TODO not clear for which case this check
        bool _isValidLimitFromHolder = _fromRole == _toRole && _fromRole == Roles.Holder && !_isValidDepositCountry(_value, _fromCountryCode, _fromBalance, _toCountryCode, _toBalance, _toCountryCurrentHolderCount, _toCountryMaxHolderNumber);
        bool _isValidLimitsToHolder = _toRole == Roles.Holder && !_isValidDepositCountry(_toBalance, _toCountryCurrentHolderCount, _toCountryMaxHolderNumber);

        return !(_isValidLimitFromHolder || _isValidLimitsToHolder);
    }

    function _updateTransferLimits(address _to, Roles _toRole, uint _value, address _from, Roles _fromRole) private {
        var (
        _fromCountryCode,
        _fromBalance,
        _toCountryCode,
        _toCountryCurrentHolderCount,
        _toCountryMaxHolderNumber,
        _toBalance
        ) = _getHoldersInfo(_to, _toRole, _value, _from, _fromRole);

        if (_fromRole == Roles.Holder && OK != dataController.withdrawFrom(_from, _value)) {
            revert();
        }

        if (_toRole == Roles.Holder && OK != dataController.depositTo(_from, _value)) {
            revert();
        }

        uint _fromCountryCurrentHolderCount;
        if (_fromRole == Roles.Holder && _fromRole == _toRole) {
            (_fromCountryCurrentHolderCount,) = dataController.getCountryInfo(_fromCountryCode);
            _updateCountries(
                _value,
                _fromCountryCode,
                _fromBalance,
                _fromCountryCurrentHolderCount,
                _toCountryCode,
                _toBalance,
                _toCountryCurrentHolderCount,
                _toCountryMaxHolderNumber
            );
        } else if (_fromRole == Roles.Holder) {
            (_fromCountryCurrentHolderCount,) = dataController.getCountryInfo(_fromCountryCode);
            _updateWithdrawCountry(_value, _fromCountryCode, _fromBalance, _fromCountryCurrentHolderCount);
        } else if (_toRole == Roles.Holder) {
            _updateDepositCountry(_toCountryCode, _toBalance, _toCountryCurrentHolderCount);
        }
    }
}



/// @title ATx Asset implementation contract.
///
/// Basic asset implementation contract, without any additional logic.
/// Every other asset implementation contracts should derive from this one.
/// Receives calls from the proxy, and calls back immediately without arguments modification.
///
/// Note: all the non constant functions return false instead of throwing in case if state change
/// didn't happen yet.
contract EEMAsset is ATxAsset {
}