Transaction Decoder

pragma solidity ^0.4.25;

/**
 * @title SafeMath
 * @dev Math operations with safety checks that revert on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, reverts on overflow.
  */
  function mul(uint256 _a, uint256 _b) internal pure returns (uint256) {
    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    if (_a == 0) {
      return 0;
    }

    uint256 c = _a * _b;
    require(c / _a == _b);

    return c;
  }

  /**
  * @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
  */
  function div(uint256 _a, uint256 _b) internal pure returns (uint256) {
    require(_b > 0); // Solidity only automatically asserts when dividing by 0
    uint256 c = _a / _b;
    // assert(_a == _b * c + _a % _b); // There is no case in which this doesn't hold

    return c;
  }

  /**
  * @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {
    require(_b <= _a);
    uint256 c = _a - _b;

    return c;
  }

  /**
  * @dev Adds two numbers, reverts on overflow.
  */
  function add(uint256 _a, uint256 _b) internal pure returns (uint256) {
    uint256 c = _a + _b;
    require(c >= _a);

    return c;
  }

  /**
  * @dev Divides two numbers and returns the remainder (unsigned integer modulo),
  * reverts when dividing by zero.
  */
  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0);
    return a % b;
  }
}

contract DSMath {
    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x, "ds-math-add-overflow");
    }
    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x, "ds-math-sub-underflow");
    }
    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x, "ds-math-mul-overflow");
    }

    function min(uint x, uint y) internal pure returns (uint z) {
        return x <= y ? x : y;
    }
    function max(uint x, uint y) internal pure returns (uint z) {
        return x >= y ? x : y;
    }
    function imin(int x, int y) internal pure returns (int z) {
        return x <= y ? x : y;
    }
    function imax(int x, int y) internal pure returns (int z) {
        return x >= y ? x : y;
    }

    uint constant WAD = 10 ** 18;
    uint constant RAY = 10 ** 27;

    function wmul(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, y), WAD / 2) / WAD;
    }
    function rmul(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, y), RAY / 2) / RAY;
    }
    function wdiv(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, WAD), y / 2) / y;
    }
    function rdiv(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, RAY), y / 2) / y;
    }

    // This famous algorithm is called "exponentiation by squaring"
    // and calculates x^n with x as fixed-point and n as regular unsigned.
    //
    // It's O(log n), instead of O(n) for naive repeated multiplication.
    //
    // These facts are why it works:
    //
    //  If n is even, then x^n = (x^2)^(n/2).
    //  If n is odd,  then x^n = x * x^(n-1),
    //   and applying the equation for even x gives
    //    x^n = x * (x^2)^((n-1) / 2).
    //
    //  Also, EVM division is flooring and
    //    floor[(n-1) / 2] = floor[n / 2].
    //
    function rpow(uint x, uint n) internal pure returns (uint z) {
        z = n % 2 != 0 ? x : RAY;

        for (n /= 2; n != 0; n /= 2) {
            x = rmul(x, x);

            if (n % 2 != 0) {
                z = rmul(z, x);
            }
        }
    }
}

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 * Altered from https://github.com/OpenZeppelin/openzeppelin-solidity/blob/a466e76d26c394b1faa6e2797aefe34668566392/contracts/token/ERC20/ERC20.sol
 */
interface ERC20 {
  function totalSupply() public view returns (uint256);

  function balanceOf(address _who) public view returns (uint256);

  function allowance(address _owner, address _spender)
    public view returns (uint256);

  function transfer(address _to, uint256 _value) public returns (bool);

  function approve(address _spender, uint256 _value) public returns (bool);

  function transferFrom(address _from, address _to, uint256 _value) public returns (bool);

  event Transfer(
    address indexed from,
    address indexed to,
    uint256 value
  );

  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}

/// @dev Just adds extra functions that we use elsewhere
contract ERC20WithFields is ERC20 {
    string public symbol;
    string public name;
    uint8 public decimals;
}


/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
 * Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 * Rearranged from https://github.com/OpenZeppelin/openzeppelin-solidity/blob/a466e76d26c394b1faa6e2797aefe34668566392/contracts/token/ERC20/StandardToken.sol
 */
contract StandardToken is ERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) balances;

    mapping (address => mapping (address => uint256)) allowed;

    uint256 totalSupply_;

    /**
     * @dev Total number of tokens in existence
     */
    function totalSupply() public view returns (uint256) {
        return totalSupply_;
    }

    /**
     * @dev Gets the balance of the specified address.
     * @param _owner The address to query the the balance of.
     * @return An uint256 representing the amount owned by the passed address.
     */
    function balanceOf(address _owner) public view returns (uint256) {
        return balances[_owner];
    }

    /**
     * @dev Function to check the amount of tokens that an owner allowed to a spender.
     * @param _owner address The address which owns the funds.
     * @param _spender address The address which will spend the funds.
     * @return A uint256 specifying the amount of tokens still available for the spender.
     */
    function allowance(
        address _owner,
        address _spender
    )
        public
        view
        returns (uint256)
    {
        return allowed[_owner][_spender];
    }

    /**
    * @dev Transfer token for a specified address
    * @param _to The address to transfer to.
    * @param _value The amount to be transferred.
    */
    function transfer(address _to, uint256 _value) public returns (bool) {
        require(_value <= balances[msg.sender]);
        require(_to != address(0));

        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    /**
    * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
    * Beware that changing an allowance with this method brings the risk that someone may use both the old
    * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
    * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
    * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
    * @param _spender The address which will spend the funds.
        * @param _value The amount of tokens to be spent.
        */
    function approve(address _spender, uint256 _value) public returns (bool) {
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    /**
    * @dev Transfer tokens from one address to another
    * @param _from address The address which you want to send tokens from
    * @param _to address The address which you want to transfer to
    * @param _value uint256 the amount of tokens to be transferred
    */
    function transferFrom(
        address _from,
        address _to,
        uint256 _value
    )
        public
        returns (bool)
    {
        require(_value <= balances[_from]);
        require(_value <= allowed[_from][msg.sender]);
        require(_to != address(0));

        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        emit Approval(_from, msg.sender, allowed[_from][msg.sender]);
        emit Transfer(_from, _to, _value);
        return true;
    }

    /**
    * @dev Increase the amount of tokens that an owner allowed to a spender.
    * approve should be called when allowed[_spender] == 0. To increment
    * allowed value is better to use this function to avoid 2 calls (and wait until
    * the first transaction is mined)
    * From MonolithDAO Token.sol
    * @param _spender The address which will spend the funds.
    * @param _addedValue The amount of tokens to increase the allowance by.
    */
    function increaseApproval(
        address _spender,
        uint256 _addedValue
    )
        public
        returns (bool)
    {
        allowed[msg.sender][_spender] = (allowed[msg.sender][_spender].add(_addedValue));
        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }

    /**
     * @dev Decrease the amount of tokens that an owner allowed to a spender.
     * approve should be called when allowed[_spender] == 0. To decrement
     * allowed value is better to use this function to avoid 2 calls (and wait until
     * the first transaction is mined)
     * From MonolithDAO Token.sol
     * @param _spender The address which will spend the funds.
     * @param _subtractedValue The amount of tokens to decrease the allowance by.
     */
    function decreaseApproval(
        address _spender,
        uint256 _subtractedValue
    )
        public
        returns (bool)
    {
        uint256 oldValue = allowed[msg.sender][_spender];
        if (_subtractedValue >= oldValue) {
            allowed[msg.sender][_spender] = 0;
        } else {
            allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
        }
        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }

    /**
    * @dev Internal function that mints an amount of the token and assigns it to
    * an account. This encapsulates the modification of balances such that the
    * proper events are emitted.
    * @param _account The account that will receive the created tokens.
    * @param _amount The amount that will be created.
     */
    function _mint(address _account, uint256 _amount) internal {
        require(_account != 0);
        totalSupply_ = totalSupply_.add(_amount);
        balances[_account] = balances[_account].add(_amount);
        emit Transfer(address(0), _account, _amount);
    }

    /**
     * @dev Internal function that burns an amount of the token of a given
     * account.
     * @param _account The account whose tokens will be burnt.
     * @param _amount The amount that will be burnt.
     */
    function _burn(address _account, uint256 _amount) internal {
        require(_account != 0);
        require(_amount <= balances[_account]);

        totalSupply_ = totalSupply_.sub(_amount);
        balances[_account] = balances[_account].sub(_amount);
        emit Transfer(_account, address(0), _amount);
    }

    /**
     * @dev Internal function that burns an amount of the token of a given
     * account, deducting from the sender's allowance for said account. Uses the
     * internal _burn function.
     * @param _account The account whose tokens will be burnt.
     * @param _amount The amount that will be burnt.
     */
    function _burnFrom(address _account, uint256 _amount) internal {
        require(_amount <= allowed[_account][msg.sender]);
        allowed[_account][msg.sender] = allowed[_account][msg.sender].sub(_amount);
        emit Approval(_account, msg.sender, allowed[_account][msg.sender]);
        _burn(_account, _amount);
    }
}


contract PreminedToken is StandardToken {
    string public symbol;
    string public  name;
    uint8 public decimals;

    constructor(string _symbol, uint8 _decimals, string _name) public {
        symbol = _symbol;
        decimals = _decimals;
        name = _name;
        totalSupply_ = 1000000 * 10**uint(decimals);
        balances[msg.sender] = totalSupply_;
        emit Transfer(address(0), msg.sender, totalSupply_);
    }
}


/// @dev Just a wrapper for premined tokens which can actually be burnt
contract BurnableToken is PreminedToken {
    constructor(string _symbol, uint8 _decimals, string _name)
        public
        PreminedToken(_symbol, _decimals, _name)
    {}

    function burn(uint _amount) public {
        _burn(msg.sender, _amount);
    }
    
    function burnFrom(address from, uint256 value) public {
        _burnFrom(from, value);
    }
}


/// @notice Must return a value for an asset
interface PriceSourceInterface {
    event PriceUpdate(address[] token, uint[] price);

    function getQuoteAsset() external view returns (address);
    function getLastUpdate() external view returns (uint);

    /// @notice Returns false if asset not applicable, or price not recent
    function hasValidPrice(address) public view returns (bool);
    function hasValidPrices(address[]) public view returns (bool);

    /// @notice Return the last known price, and when it was issued
    function getPrice(address _asset) public view returns (uint price, uint timestamp);
    function getPrices(address[] _assets) public view returns (uint[] prices, uint[] timestamps);

    /// @notice Get price info, and revert if not valid
    function getPriceInfo(address _asset) view returns (uint price, uint decimals);
    function getInvertedPriceInfo(address ofAsset) view returns (uint price, uint decimals);

    function getReferencePriceInfo(address _base, address _quote) public view returns (uint referencePrice, uint decimal);
    function getOrderPriceInfo(address sellAsset, address buyAsset, uint sellQuantity, uint buyQuantity) public view returns (uint orderPrice);
    function existsPriceOnAssetPair(address sellAsset, address buyAsset) public view returns (bool isExistent);
    function convertQuantity(
        uint fromAssetQuantity,
        address fromAsset,
        address toAsset
    ) public view returns (uint);
}


contract DSAuthority {
    function canCall(
        address src, address dst, bytes4 sig
    ) public view returns (bool);
}

contract DSAuthEvents {
    event LogSetAuthority (address indexed authority);
    event LogSetOwner     (address indexed owner);
}

contract DSAuth is DSAuthEvents {
    DSAuthority  public  authority;
    address      public  owner;

    constructor() public {
        owner = msg.sender;
        emit LogSetOwner(msg.sender);
    }

    function setOwner(address owner_)
        public
        auth
    {
        owner = owner_;
        emit LogSetOwner(owner);
    }

    function setAuthority(DSAuthority authority_)
        public
        auth
    {
        authority = authority_;
        emit LogSetAuthority(address(authority));
    }

    modifier auth {
        require(isAuthorized(msg.sender, msg.sig), "ds-auth-unauthorized");
        _;
    }

    function isAuthorized(address src, bytes4 sig) internal view returns (bool) {
        if (src == address(this)) {
            return true;
        } else if (src == owner) {
            return true;
        } else if (authority == DSAuthority(0)) {
            return false;
        } else {
            return authority.canCall(src, address(this), sig);
        }
    }
}

contract DSGuardEvents {
    event LogPermit(
        bytes32 indexed src,
        bytes32 indexed dst,
        bytes32 indexed sig
    );

    event LogForbid(
        bytes32 indexed src,
        bytes32 indexed dst,
        bytes32 indexed sig
    );
}

contract DSGuard is DSAuth, DSAuthority, DSGuardEvents {
    bytes32 constant public ANY = bytes32(uint(-1));

    mapping (bytes32 => mapping (bytes32 => mapping (bytes32 => bool))) acl;

    function canCall(
        address src_, address dst_, bytes4 sig
    ) public view returns (bool) {
        bytes32 src = bytes32(bytes20(src_));
        bytes32 dst = bytes32(bytes20(dst_));

        return acl[src][dst][sig]
            || acl[src][dst][ANY]
            || acl[src][ANY][sig]
            || acl[src][ANY][ANY]
            || acl[ANY][dst][sig]
            || acl[ANY][dst][ANY]
            || acl[ANY][ANY][sig]
            || acl[ANY][ANY][ANY];
    }

    function permit(bytes32 src, bytes32 dst, bytes32 sig) public auth {
        acl[src][dst][sig] = true;
        emit LogPermit(src, dst, sig);
    }

    function forbid(bytes32 src, bytes32 dst, bytes32 sig) public auth {
        acl[src][dst][sig] = false;
        emit LogForbid(src, dst, sig);
    }

    function permit(address src, address dst, bytes32 sig) public {
        permit(bytes32(bytes20(src)), bytes32(bytes20(dst)), sig);
    }
    function forbid(address src, address dst, bytes32 sig) public {
        forbid(bytes32(bytes20(src)), bytes32(bytes20(dst)), sig);
    }

}

contract DSGuardFactory {
    mapping (address => bool)  public  isGuard;

    function newGuard() public returns (DSGuard guard) {
        guard = new DSGuard();
        guard.setOwner(msg.sender);
        isGuard[address(guard)] = true;
    }
}

/// @notice Has one Hub
contract Spoke is DSAuth {
    Hub public hub;
    Hub.Routes public routes;
    bool public initialized;

    modifier onlyInitialized() {
        require(initialized, "Component not yet initialized");
        _;
    }

    modifier notShutDown() {
        require(!hub.isShutDown(), "Hub is shut down");
        _;
    }

    constructor(address _hub) {
        hub = Hub(_hub);
        setAuthority(hub);
        setOwner(hub); // temporary, to allow initialization
    }

    function initialize(address[12] _spokes) external auth {
        require(msg.sender == address(hub));
        require(!initialized, "Already initialized");
        routes = Hub.Routes(
            _spokes[0],
            _spokes[1],
            _spokes[2],
            _spokes[3],
            _spokes[4],
            _spokes[5],
            _spokes[6],
            _spokes[7],
            _spokes[8],
            _spokes[9],
            _spokes[10],
            _spokes[11]
        );
        initialized = true;
        setOwner(address(0));
    }

    function engine() public view returns (address) { return routes.engine; }
    function mlnToken() public view returns (address) { return routes.mlnToken; }
    function priceSource() public view returns (address) { return routes.priceSource; }
    function version() public view returns (address) { return routes.version; }
    function registry() public view returns (address) { return routes.registry; }
}


/// @notice Router for communication between components
/// @notice Has one or more Spokes
contract Hub is DSGuard {

    event FundShutDown();

    struct Routes {
        address accounting;
        address feeManager;
        address participation;
        address policyManager;
        address shares;
        address trading;
        address vault;
        address priceSource;
        address registry;
        address version;
        address engine;
        address mlnToken;
    }

    Routes public routes;
    address public manager;
    address public creator;
    string public name;
    bool public isShutDown;
    bool public spokesSet;
    bool public routingSet;
    bool public permissionsSet;
    uint public creationTime;
    mapping (address => bool) public isSpoke;

    constructor(address _manager, string _name) {
        creator = msg.sender;
        manager = _manager;
        name = _name;
        creationTime = block.timestamp;
    }

    modifier onlyCreator() {
        require(msg.sender == creator, "Only creator can do this");
        _;
    }

    function shutDownFund() external {
        require(msg.sender == routes.version);
        isShutDown = true;
        emit FundShutDown();
    }

    function setSpokes(address[12] _spokes) external onlyCreator {
        require(!spokesSet, "Spokes already set");
        for (uint i = 0; i < _spokes.length; i++) {
            isSpoke[_spokes[i]] = true;
        }
        routes.accounting = _spokes[0];
        routes.feeManager = _spokes[1];
        routes.participation = _spokes[2];
        routes.policyManager = _spokes[3];
        routes.shares = _spokes[4];
        routes.trading = _spokes[5];
        routes.vault = _spokes[6];
        routes.priceSource = _spokes[7];
        routes.registry = _spokes[8];
        routes.version = _spokes[9];
        routes.engine = _spokes[10];
        routes.mlnToken = _spokes[11];
        spokesSet = true;
    }

    function setRouting() external onlyCreator {
        require(spokesSet, "Spokes must be set");
        require(!routingSet, "Routing already set");
        address[12] memory spokes = [
            routes.accounting, routes.feeManager, routes.participation,
            routes.policyManager, routes.shares, routes.trading,
            routes.vault, routes.priceSource, routes.registry,
            routes.version, routes.engine, routes.mlnToken
        ];
        Spoke(routes.accounting).initialize(spokes);
        Spoke(routes.feeManager).initialize(spokes);
        Spoke(routes.participation).initialize(spokes);
        Spoke(routes.policyManager).initialize(spokes);
        Spoke(routes.shares).initialize(spokes);
        Spoke(routes.trading).initialize(spokes);
        Spoke(routes.vault).initialize(spokes);
        routingSet = true;
    }

    function setPermissions() external onlyCreator {
        require(spokesSet, "Spokes must be set");
        require(routingSet, "Routing must be set");
        require(!permissionsSet, "Permissioning already set");
        permit(routes.participation, routes.vault, bytes4(keccak256('withdraw(address,uint256)')));
        permit(routes.trading, routes.vault, bytes4(keccak256('withdraw(address,uint256)')));
        permit(routes.participation, routes.shares, bytes4(keccak256('createFor(address,uint256)')));
        permit(routes.participation, routes.shares, bytes4(keccak256('destroyFor(address,uint256)')));
        permit(routes.feeManager, routes.shares, bytes4(keccak256('createFor(address,uint256)')));
        permit(routes.participation, routes.accounting, bytes4(keccak256('addAssetToOwnedAssets(address)')));
        permit(routes.trading, routes.accounting, bytes4(keccak256('addAssetToOwnedAssets(address)')));
        permit(routes.trading, routes.accounting, bytes4(keccak256('removeFromOwnedAssets(address)')));
        permit(routes.accounting, routes.feeManager, bytes4(keccak256('rewardAllFees()')));
        permit(manager, routes.policyManager, bytes4(keccak256('register(bytes4,address)')));
        permit(manager, routes.policyManager, bytes4(keccak256('batchRegister(bytes4[],address[])')));
        permit(manager, routes.participation, bytes4(keccak256('enableInvestment(address[])')));
        permit(manager, routes.participation, bytes4(keccak256('disableInvestment(address[])')));
        permissionsSet = true;
    }

    function vault() external view returns (address) { return routes.vault; }
    function accounting() external view returns (address) { return routes.accounting; }
    function priceSource() external view returns (address) { return routes.priceSource; }
    function participation() external view returns (address) { return routes.participation; }
    function trading() external view returns (address) { return routes.trading; }
    function shares() external view returns (address) { return routes.shares; }
    function registry() external view returns (address) { return routes.registry; }
    function policyManager() external view returns (address) { return routes.policyManager; }
}




contract Registry is DSAuth {

    // EVENTS
    event AssetUpsert (
        address indexed asset,
        string name,
        string symbol,
        uint decimals,
        string url,
        uint reserveMin,
        uint[] standards,
        bytes4[] sigs
    );

    event ExchangeAdapterUpsert (
        address indexed exchange,
        address indexed adapter,
        bool takesCustody,
        bytes4[] sigs
    );

    event AssetRemoval (address indexed asset);
    event EfxWrapperRegistryChange(address indexed registry);
    event EngineChange(address indexed engine);
    event ExchangeAdapterRemoval (address indexed exchange);
    event IncentiveChange(uint incentiveAmount);
    event MGMChange(address indexed MGM);
    event MlnTokenChange(address indexed mlnToken);
    event NativeAssetChange(address indexed nativeAsset);
    event PriceSourceChange(address indexed priceSource);
    event VersionRegistration(address indexed version);

    // TYPES
    struct Asset {
        bool exists;
        string name;
        string symbol;
        uint decimals;
        string url;
        uint reserveMin;
        uint[] standards;
        bytes4[] sigs;
    }

    struct Exchange {
        bool exists;
        address exchangeAddress;
        bool takesCustody;
        bytes4[] sigs;
    }

    struct Version {
        bool exists;
        bytes32 name;
    }

    // CONSTANTS
    uint public constant MAX_REGISTERED_ENTITIES = 20;
    uint public constant MAX_FUND_NAME_BYTES = 66;

    // FIELDS
    mapping (address => Asset) public assetInformation;
    address[] public registeredAssets;

    // Mapping from adapter address to exchange Information (Adapters are unique)
    mapping (address => Exchange) public exchangeInformation;
    address[] public registeredExchangeAdapters;

    mapping (address => Version) public versionInformation;
    address[] public registeredVersions;

    mapping (address => bool) public isFeeRegistered;

    mapping (address => address) public fundsToVersions;
    mapping (bytes32 => bool) public versionNameExists;
    mapping (bytes32 => address) public fundNameHashToOwner;


    uint public incentive = 10 finney;
    address public priceSource;
    address public mlnToken;
    address public nativeAsset;
    address public engine;
    address public ethfinexWrapperRegistry;
    address public MGM;

    modifier onlyVersion() {
        require(
            versionInformation[msg.sender].exists,
            "Only a Version can do this"
        );
        _;
    }

    // METHODS

    constructor(address _postDeployOwner) {
        setOwner(_postDeployOwner);
    }

    // PUBLIC METHODS

    /// @notice Whether _name has only valid characters
    function isValidFundName(string _name) public view returns (bool) {
        bytes memory b = bytes(_name);
        if (b.length > MAX_FUND_NAME_BYTES) return false;
        for (uint i; i < b.length; i++){
            bytes1 char = b[i];
            if(
                !(char >= 0x30 && char <= 0x39) && // 9-0
                !(char >= 0x41 && char <= 0x5A) && // A-Z
                !(char >= 0x61 && char <= 0x7A) && // a-z
                !(char == 0x20 || char == 0x2D) && // space, dash
                !(char == 0x2E || char == 0x5F) && // period, underscore
                !(char == 0x2A) // *
            ) {
                return false;
            }
        }
        return true;
    }

    /// @notice Whether _user can use _name for their fund
    function canUseFundName(address _user, string _name) public view returns (bool) {
        bytes32 nameHash = keccak256(_name);
        return (
            isValidFundName(_name) &&
            (
                fundNameHashToOwner[nameHash] == address(0) ||
                fundNameHashToOwner[nameHash] == _user
            )
        );
    }

    function reserveFundName(address _owner, string _name)
        external
        onlyVersion
    {
        require(canUseFundName(_owner, _name), "Fund name cannot be used");
        fundNameHashToOwner[keccak256(_name)] = _owner;
    }

    function registerFund(address _fund, address _owner, string _name)
        external
        onlyVersion
    {
        require(canUseFundName(_owner, _name), "Fund name cannot be used");
        fundsToVersions[_fund] = msg.sender;
    }

    /// @notice Registers an Asset information entry
    /// @dev Pre: Only registrar owner should be able to register
    /// @dev Post: Address _asset is registered
    /// @param _asset Address of asset to be registered
    /// @param _name Human-readable name of the Asset
    /// @param _symbol Human-readable symbol of the Asset
    /// @param _url Url for extended information of the asset
    /// @param _standards Integers of EIP standards this asset adheres to
    /// @param _sigs Function signatures for whitelisted asset functions
    function registerAsset(
        address _asset,
        string _name,
        string _symbol,
        string _url,
        uint _reserveMin,
        uint[] _standards,
        bytes4[] _sigs
    ) external auth {
        require(registeredAssets.length < MAX_REGISTERED_ENTITIES);
        require(!assetInformation[_asset].exists);
        assetInformation[_asset].exists = true;
        registeredAssets.push(_asset);
        updateAsset(
            _asset,
            _name,
            _symbol,
            _url,
            _reserveMin,
            _standards,
            _sigs
        );
    }

    /// @notice Register an exchange information entry (A mapping from exchange adapter -> Exchange information)
    /// @dev Adapters are unique so are used as the mapping key. There may be different adapters for same exchange (0x / Ethfinex)
    /// @dev Pre: Only registrar owner should be able to register
    /// @dev Post: Address _exchange is registered
    /// @param _exchange Address of the exchange for the adapter
    /// @param _adapter Address of exchange adapter
    /// @param _takesCustody Whether this exchange takes custody of tokens before trading
    /// @param _sigs Function signatures for whitelisted exchange functions
    function registerExchangeAdapter(
        address _exchange,
        address _adapter,
        bool _takesCustody,
        bytes4[] _sigs
    ) external auth {
        require(!exchangeInformation[_adapter].exists, "Adapter already exists");
        exchangeInformation[_adapter].exists = true;
        require(registeredExchangeAdapters.length < MAX_REGISTERED_ENTITIES, "Exchange limit reached");
        registeredExchangeAdapters.push(_adapter);
        updateExchangeAdapter(
            _exchange,
            _adapter,
            _takesCustody,
            _sigs
        );
    }

    /// @notice Versions cannot be removed from registry
    /// @param _version Address of the version contract
    /// @param _name Name of the version
    function registerVersion(
        address _version,
        bytes32 _name
    ) external auth {
        require(!versionInformation[_version].exists, "Version already exists");
        require(!versionNameExists[_name], "Version name already exists");
        versionInformation[_version].exists = true;
        versionNameExists[_name] = true;
        versionInformation[_version].name = _name;
        registeredVersions.push(_version);
        emit VersionRegistration(_version);
    }

    function setIncentive(uint _weiAmount) external auth {
        incentive = _weiAmount;
        emit IncentiveChange(_weiAmount);
    }

    function setPriceSource(address _priceSource) external auth {
        priceSource = _priceSource;
        emit PriceSourceChange(_priceSource);
    }

    function setMlnToken(address _mlnToken) external auth {
        mlnToken = _mlnToken;
        emit MlnTokenChange(_mlnToken);
    }

    function setNativeAsset(address _nativeAsset) external auth {
        nativeAsset = _nativeAsset;
        emit NativeAssetChange(_nativeAsset);
    }

    function setEngine(address _engine) external auth {
        engine = _engine;
        emit EngineChange(_engine);
    }

    function setMGM(address _MGM) external auth {
        MGM = _MGM;
        emit MGMChange(_MGM);
    }

    function setEthfinexWrapperRegistry(address _registry) external auth {
        ethfinexWrapperRegistry = _registry;
        emit EfxWrapperRegistryChange(_registry);
    }

    /// @notice Updates description information of a registered Asset
    /// @dev Pre: Owner can change an existing entry
    /// @dev Post: Changed Name, Symbol, URL and/or IPFSHash
    /// @param _asset Address of the asset to be updated
    /// @param _name Human-readable name of the Asset
    /// @param _symbol Human-readable symbol of the Asset
    /// @param _url Url for extended information of the asset
    function updateAsset(
        address _asset,
        string _name,
        string _symbol,
        string _url,
        uint _reserveMin,
        uint[] _standards,
        bytes4[] _sigs
    ) public auth {
        require(assetInformation[_asset].exists);
        Asset asset = assetInformation[_asset];
        asset.name = _name;
        asset.symbol = _symbol;
        asset.decimals = ERC20WithFields(_asset).decimals();
        asset.url = _url;
        asset.reserveMin = _reserveMin;
        asset.standards = _standards;
        asset.sigs = _sigs;
        emit AssetUpsert(
            _asset,
            _name,
            _symbol,
            asset.decimals,
            _url,
            _reserveMin,
            _standards,
            _sigs
        );
    }

    function updateExchangeAdapter(
        address _exchange,
        address _adapter,
        bool _takesCustody,
        bytes4[] _sigs
    ) public auth {
        require(exchangeInformation[_adapter].exists, "Exchange with adapter doesn't exist");
        Exchange exchange = exchangeInformation[_adapter];
        exchange.exchangeAddress = _exchange;
        exchange.takesCustody = _takesCustody;
        exchange.sigs = _sigs;
        emit ExchangeAdapterUpsert(
            _exchange,
            _adapter,
            _takesCustody,
            _sigs
        );
    }

    /// @notice Deletes an existing entry
    /// @dev Owner can delete an existing entry
    /// @param _asset address for which specific information is requested
    function removeAsset(
        address _asset,
        uint _assetIndex
    ) external auth {
        require(assetInformation[_asset].exists);
        require(registeredAssets[_assetIndex] == _asset);
        delete assetInformation[_asset];
        delete registeredAssets[_assetIndex];
        for (uint i = _assetIndex; i < registeredAssets.length-1; i++) {
            registeredAssets[i] = registeredAssets[i+1];
        }
        registeredAssets.length--;
        emit AssetRemoval(_asset);
    }

    /// @notice Deletes an existing entry
    /// @dev Owner can delete an existing entry
    /// @param _adapter address of the adapter of the exchange that is to be removed
    /// @param _adapterIndex index of the exchange in array
    function removeExchangeAdapter(
        address _adapter,
        uint _adapterIndex
    ) external auth {
        require(exchangeInformation[_adapter].exists, "Exchange with adapter doesn't exist");
        require(registeredExchangeAdapters[_adapterIndex] == _adapter, "Incorrect adapter index");
        delete exchangeInformation[_adapter];
        delete registeredExchangeAdapters[_adapterIndex];
        for (uint i = _adapterIndex; i < registeredExchangeAdapters.length-1; i++) {
            registeredExchangeAdapters[i] = registeredExchangeAdapters[i+1];
        }
        registeredExchangeAdapters.length--;
        emit ExchangeAdapterRemoval(_adapter);
    }

    function registerFees(address[] _fees) external auth {
        for (uint i; i < _fees.length; i++) {
            isFeeRegistered[_fees[i]] = true;
        }
    }

    function deregisterFees(address[] _fees) external auth {
        for (uint i; i < _fees.length; i++) {
            delete isFeeRegistered[_fees[i]];
        }
    }

    // PUBLIC VIEW METHODS

    // get asset specific information
    function getName(address _asset) external view returns (string) {
        return assetInformation[_asset].name;
    }
    function getSymbol(address _asset) external view returns (string) {
        return assetInformation[_asset].symbol;
    }
    function getDecimals(address _asset) external view returns (uint) {
        return assetInformation[_asset].decimals;
    }
    function getReserveMin(address _asset) external view returns (uint) {
        return assetInformation[_asset].reserveMin;
    }
    function assetIsRegistered(address _asset) external view returns (bool) {
        return assetInformation[_asset].exists;
    }
    function getRegisteredAssets() external view returns (address[]) {
        return registeredAssets;
    }
    function assetMethodIsAllowed(address _asset, bytes4 _sig)
        external
        view
        returns (bool)
    {
        bytes4[] memory signatures = assetInformation[_asset].sigs;
        for (uint i = 0; i < signatures.length; i++) {
            if (signatures[i] == _sig) {
                return true;
            }
        }
        return false;
    }

    // get exchange-specific information
    function exchangeAdapterIsRegistered(address _adapter) external view returns (bool) {
        return exchangeInformation[_adapter].exists;
    }
    function getRegisteredExchangeAdapters() external view returns (address[]) {
        return registeredExchangeAdapters;
    }
    function getExchangeInformation(address _adapter)
        public
        view
        returns (address, bool)
    {
        Exchange exchange = exchangeInformation[_adapter];
        return (
            exchange.exchangeAddress,
            exchange.takesCustody
        );
    }
    function exchangeForAdapter(address _adapter) external view returns (address) {
        Exchange exchange = exchangeInformation[_adapter];
        return exchange.exchangeAddress;
    }
    function getAdapterFunctionSignatures(address _adapter)
        public
        view
        returns (bytes4[])
    {
        return exchangeInformation[_adapter].sigs;
    }
    function adapterMethodIsAllowed(
        address _adapter, bytes4 _sig
    )
        external
        view
        returns (bool)
    {
        bytes4[] memory signatures = exchangeInformation[_adapter].sigs;
        for (uint i = 0; i < signatures.length; i++) {
            if (signatures[i] == _sig) {
                return true;
            }
        }
        return false;
    }

    // get version and fund information
    function getRegisteredVersions() external view returns (address[]) {
        return registeredVersions;
    }

    function isFund(address _who) external view returns (bool) {
        if (fundsToVersions[_who] != address(0)) {
            return true; // directly from a hub
        } else {
            address hub = Hub(Spoke(_who).hub());
            require(
                Hub(hub).isSpoke(_who),
                "Call from either a spoke or hub"
            );
            return fundsToVersions[hub] != address(0);
        }
    }

    function isFundFactory(address _who) external view returns (bool) {
        return versionInformation[_who].exists;
    }
}


/// @notice Liquidity contract and token sink
contract Engine is DSMath {

    event RegistryChange(address registry);
    event SetAmguPrice(uint amguPrice);
    event AmguPaid(uint amount);
    event Thaw(uint amount);
    event Burn(uint amount);

    uint public constant MLN_DECIMALS = 18;

    Registry public registry;
    uint public amguPrice;
    uint public frozenEther;
    uint public liquidEther;
    uint public lastThaw;
    uint public thawingDelay;
    uint public totalEtherConsumed;
    uint public totalAmguConsumed;
    uint public totalMlnBurned;

    constructor(uint _delay, address _registry) {
        lastThaw = block.timestamp;
        thawingDelay = _delay;
        _setRegistry(_registry);
    }

    modifier onlyMGM() {
        require(
            msg.sender == registry.MGM(),
            "Only MGM can call this"
        );
        _;
    }

    /// @dev Registry owner is MTC
    modifier onlyMTC() {
        require(
            msg.sender == registry.owner(),
            "Only MTC can call this"
        );
        _;
    }

    function _setRegistry(address _registry) internal {
        registry = Registry(_registry);
        emit RegistryChange(registry);
    }

    /// @dev only callable by MTC
    function setRegistry(address _registry)
        external
        onlyMTC
    {
        _setRegistry(_registry);
    }

    /// @dev set price of AMGU in MLN (base units)
    /// @dev only callable by MGM
    function setAmguPrice(uint _price)
        external
        onlyMGM
    {
        amguPrice = _price;
        emit SetAmguPrice(_price);
    }

    function getAmguPrice() public view returns (uint) { return amguPrice; }

    function premiumPercent() public view returns (uint) {
        if (liquidEther < 1 ether) {
            return 0;
        } else if (liquidEther >= 1 ether && liquidEther < 5 ether) {
            return 5;
        } else if (liquidEther >= 5 ether && liquidEther < 10 ether) {
            return 10;
        } else if (liquidEther >= 10 ether) {
            return 15;
        }
    }

    function payAmguInEther() external payable {
        require(
            registry.isFundFactory(msg.sender) ||
            registry.isFund(msg.sender),
            "Sender must be a fund or the factory"
        );
        uint mlnPerAmgu = getAmguPrice();
        uint ethPerMln;
        (ethPerMln,) = priceSource().getPrice(address(mlnToken()));
        uint amguConsumed;
        if (mlnPerAmgu > 0 && ethPerMln > 0) {
            amguConsumed = (mul(msg.value, 10 ** uint(MLN_DECIMALS))) / (mul(ethPerMln, mlnPerAmgu));
        } else {
            amguConsumed = 0;
        }
        totalEtherConsumed = add(totalEtherConsumed, msg.value);
        totalAmguConsumed = add(totalAmguConsumed, amguConsumed);
        frozenEther = add(frozenEther, msg.value);
        emit AmguPaid(amguConsumed);
    }

    /// @notice Move frozen ether to liquid pool after delay
    /// @dev Delay only restarts when this function is called
    function thaw() external {
        require(
            block.timestamp >= add(lastThaw, thawingDelay),
            "Thawing delay has not passed"
        );
        require(frozenEther > 0, "No frozen ether to thaw");
        lastThaw = block.timestamp;
        liquidEther = add(liquidEther, frozenEther);
        emit Thaw(frozenEther);
        frozenEther = 0;
    }

    /// @return ETH per MLN including premium
    function enginePrice() public view returns (uint) {
        uint ethPerMln;
        (ethPerMln, ) = priceSource().getPrice(address(mlnToken()));
        uint premium = (mul(ethPerMln, premiumPercent()) / 100);
        return add(ethPerMln, premium);
    }

    function ethPayoutForMlnAmount(uint mlnAmount) public view returns (uint) {
        return mul(mlnAmount, enginePrice()) / 10 ** uint(MLN_DECIMALS);
    }

    /// @notice MLN must be approved first
    function sellAndBurnMln(uint mlnAmount) external {
        require(registry.isFund(msg.sender), "Only funds can use the engine");
        require(
            mlnToken().transferFrom(msg.sender, address(this), mlnAmount),
            "MLN transferFrom failed"
        );
        uint ethToSend = ethPayoutForMlnAmount(mlnAmount);
        require(ethToSend > 0, "No ether to pay out");
        require(liquidEther >= ethToSend, "Not enough liquid ether to send");
        liquidEther = sub(liquidEther, ethToSend);
        totalMlnBurned = add(totalMlnBurned, mlnAmount);
        msg.sender.transfer(ethToSend);
        mlnToken().burn(mlnAmount);
        emit Burn(mlnAmount);
    }

    /// @dev Get MLN from the registry
    function mlnToken()
        public
        view
        returns (BurnableToken)
    {
        return BurnableToken(registry.mlnToken());
    }

    /// @dev Get PriceSource from the registry
    function priceSource()
        public
        view
        returns (PriceSourceInterface)
    {
        return PriceSourceInterface(registry.priceSource());
    }
}

// Copyright (C) 2015, 2016, 2017 Dapphub

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity ^0.4.18;

contract WETH9 {
    string public name     = "Wrapped Ether";
    string public symbol   = "WETH";
    uint8  public decimals = 18;

    event  Approval(address indexed src, address indexed guy, uint wad);
    event  Transfer(address indexed src, address indexed dst, uint wad);
    event  Deposit(address indexed dst, uint wad);
    event  Withdrawal(address indexed src, uint wad);

    mapping (address => uint)                       public  balanceOf;
    mapping (address => mapping (address => uint))  public  allowance;

    function() public payable {
        deposit();
    }
    function deposit() public payable {
        balanceOf[msg.sender] += msg.value;
        Deposit(msg.sender, msg.value);
    }
    function withdraw(uint wad) public {
        require(balanceOf[msg.sender] >= wad);
        balanceOf[msg.sender] -= wad;
        msg.sender.transfer(wad);
        Withdrawal(msg.sender, wad);
    }

    function totalSupply() public view returns (uint) {
        return this.balance;
    }

    function approve(address guy, uint wad) public returns (bool) {
        allowance[msg.sender][guy] = wad;
        Approval(msg.sender, guy, wad);
        return true;
    }

    function transfer(address dst, uint wad) public returns (bool) {
        return transferFrom(msg.sender, dst, wad);
    }

    function transferFrom(address src, address dst, uint wad)
        public
        returns (bool)
    {
        require(balanceOf[src] >= wad);

        if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {
            require(allowance[src][msg.sender] >= wad);
            allowance[src][msg.sender] -= wad;
        }

        balanceOf[src] -= wad;
        balanceOf[dst] += wad;

        Transfer(src, dst, wad);

        return true;
    }
}


/*
                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

                            Preamble

  The GNU General Public License is a free, copyleft license for
software and other kinds of works.

  The licenses for most software and other practical works are designed
to take away your freedom to share and change the works.  By contrast,
the GNU General Public License is intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
software for all its users.  We, the Free Software Foundation, use the
GNU General Public License for most of our software; it applies also to
any other work released this way by its authors.  You can apply it to
your programs, too.

  When we speak of free software, we are referring to freedom, not
price.  Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
them if you wish), that you receive source code or can get it if you
want it, that you can change the software or use pieces of it in new
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  To protect your rights, we need to prevent others from denying you
these rights or asking you to surrender the rights.  Therefore, you have
certain responsibilities if you distribute copies of the software, or if
you modify it: responsibilities to respect the freedom of others.

  For example, if you distribute copies of such a program, whether
gratis or for a fee, you must pass on to the recipients the same
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or can get the source code.  And you must show them these terms so they
know their rights.

  Developers that use the GNU GPL protect your rights with two steps:
(1) assert copyright on the software, and (2) offer you this License
giving you legal permission to copy, distribute and/or modify it.

  For the developers' and authors' protection, the GPL clearly explains
that there is no warranty for this free software.  For both users' and
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  Some devices are designed to deny users access to install or run
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  The precise terms and conditions for copying, distribution and
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            How to Apply These Terms to Your New Programs

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possible use to the public, the best way to achieve this is to make it
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Also add information on how to contact you by electronic and paper mail.

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notice like this when it starts in an interactive mode:

    <program>  Copyright (C) <year>  <name of author>
    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
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    under certain conditions; type `show c' for details.

The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License.  Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".

  You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.

  The GNU General Public License does not permit incorporating your program
into proprietary programs.  If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
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*/

// Verified using https://dapp.tools
// hevm: flattened sources of contracts/Melon.sol
pragma solidity ^0.4.24;

////// contracts/openzeppelin/IERC20.sol
/* pragma solidity ^0.4.24; */

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address who) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function transfer(address to, uint256 value) external returns (bool);

    function approve(address spender, uint256 value) external returns (bool);

    function transferFrom(address from, address to, uint256 value) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);
}

////// contracts/openzeppelin/SafeMath.sol
/* pragma solidity ^0.4.24; */

/**
 * @title SafeMath
 * @dev Math operations with safety checks that revert on error
 */
library SafeMath {
    int256 constant private INT256_MIN = -2**255;

    /**
    * @dev Multiplies two unsigned integers, reverts on overflow.
    */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b);

        return c;
    }

    /**
    * @dev Multiplies two signed integers, reverts on overflow.
    */
    function mul(int256 a, int256 b) internal pure returns (int256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        require(!(a == -1 && b == INT256_MIN)); // This is the only case of overflow not detected by the check below

        int256 c = a * b;
        require(c / a == b);

        return c;
    }

    /**
    * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
    */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
    * @dev Integer division of two signed integers truncating the quotient, reverts on division by zero.
    */
    function div(int256 a, int256 b) internal pure returns (int256) {
        require(b != 0); // Solidity only automatically asserts when dividing by 0
        require(!(b == -1 && a == INT256_MIN)); // This is the only case of overflow

        int256 c = a / b;

        return c;
    }

    /**
    * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;

        return c;
    }

    /**
    * @dev Subtracts two signed integers, reverts on overflow.
    */
    function sub(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a - b;
        require((b >= 0 && c <= a) || (b < 0 && c > a));

        return c;
    }

    /**
    * @dev Adds two unsigned integers, reverts on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);

        return c;
    }

    /**
    * @dev Adds two signed integers, reverts on overflow.
    */
    function add(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a + b;
        require((b >= 0 && c >= a) || (b < 0 && c < a));

        return c;
    }

    /**
    * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
    * reverts when dividing by zero.
    */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0);
        return a % b;
    }
}

////// contracts/openzeppelin/ERC20.sol
/* pragma solidity ^0.4.24; */

/* import "./IERC20.sol"; */
/* import "./SafeMath.sol"; */

/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
 * Originally based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 *
 * This implementation emits additional Approval events, allowing applications to reconstruct the allowance status for
 * all accounts just by listening to said events. Note that this isn't required by the specification, and other
 * compliant implementations may not do it.
 */
contract ERC20 is IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowed;

    uint256 private _totalSupply;

    /**
    * @dev Total number of tokens in existence
    */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /**
    * @dev Gets the balance of the specified address.
    * @param owner The address to query the balance of.
    * @return An uint256 representing the amount owned by the passed address.
    */
    function balanceOf(address owner) public view returns (uint256) {
        return _balances[owner];
    }

    /**
     * @dev Function to check the amount of tokens that an owner allowed to a spender.
     * @param owner address The address which owns the funds.
     * @param spender address The address which will spend the funds.
     * @return A uint256 specifying the amount of tokens still available for the spender.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowed[owner][spender];
    }

    /**
    * @dev Transfer token for a specified address
    * @param to The address to transfer to.
    * @param value The amount to be transferred.
    */
    function transfer(address to, uint256 value) public returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    /**
     * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
     * Beware that changing an allowance with this method brings the risk that someone may use both the old
     * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
     * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     */
    function approve(address spender, uint256 value) public returns (bool) {
        require(spender != address(0));

        _allowed[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }

    /**
     * @dev Transfer tokens from one address to another.
     * Note that while this function emits an Approval event, this is not required as per the specification,
     * and other compliant implementations may not emit the event.
     * @param from address The address which you want to send tokens from
     * @param to address The address which you want to transfer to
     * @param value uint256 the amount of tokens to be transferred
     */
    function transferFrom(address from, address to, uint256 value) public returns (bool) {
        _allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);
        _transfer(from, to, value);
        emit Approval(from, msg.sender, _allowed[from][msg.sender]);
        return true;
    }

    /**
     * @dev Increase the amount of tokens that an owner allowed to a spender.
     * approve should be called when allowed_[_spender] == 0. To increment
     * allowed value is better to use this function to avoid 2 calls (and wait until
     * the first transaction is mined)
     * From MonolithDAO Token.sol
     * Emits an Approval event.
     * @param spender The address which will spend the funds.
     * @param addedValue The amount of tokens to increase the allowance by.
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        require(spender != address(0));

        _allowed[msg.sender][spender] = _allowed[msg.sender][spender].add(addedValue);
        emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
        return true;
    }

    /**
     * @dev Decrease the amount of tokens that an owner allowed to a spender.
     * approve should be called when allowed_[_spender] == 0. To decrement
     * allowed value is better to use this function to avoid 2 calls (and wait until
     * the first transaction is mined)
     * From MonolithDAO Token.sol
     * Emits an Approval event.
     * @param spender The address which will spend the funds.
     * @param subtractedValue The amount of tokens to decrease the allowance by.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        require(spender != address(0));

        _allowed[msg.sender][spender] = _allowed[msg.sender][spender].sub(subtractedValue);
        emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
        return true;
    }

    /**
    * @dev Transfer token for a specified addresses
    * @param from The address to transfer from.
    * @param to The address to transfer to.
    * @param value The amount to be transferred.
    */
    function _transfer(address from, address to, uint256 value) internal {
        require(to != address(0));

        _balances[from] = _balances[from].sub(value);
        _balances[to] = _balances[to].add(value);
        emit Transfer(from, to, value);
    }

    /**
     * @dev Internal function that mints an amount of the token and assigns it to
     * an account. This encapsulates the modification of balances such that the
     * proper events are emitted.
     * @param account The account that will receive the created tokens.
     * @param value The amount that will be created.
     */
    function _mint(address account, uint256 value) internal {
        require(account != address(0));

        _totalSupply = _totalSupply.add(value);
        _balances[account] = _balances[account].add(value);
        emit Transfer(address(0), account, value);
    }

    /**
     * @dev Internal function that burns an amount of the token of a given
     * account.
     * @param account The account whose tokens will be burnt.
     * @param value The amount that will be burnt.
     */
    function _burn(address account, uint256 value) internal {
        require(account != address(0));

        _totalSupply = _totalSupply.sub(value);
        _balances[account] = _balances[account].sub(value);
        emit Transfer(account, address(0), value);
    }

    /**
     * @dev Internal function that burns an amount of the token of a given
     * account, deducting from the sender's allowance for said account. Uses the
     * internal burn function.
     * Emits an Approval event (reflecting the reduced allowance).
     * @param account The account whose tokens will be burnt.
     * @param value The amount that will be burnt.
     */
    function _burnFrom(address account, uint256 value) internal {
        _allowed[account][msg.sender] = _allowed[account][msg.sender].sub(value);
        _burn(account, value);
        emit Approval(account, msg.sender, _allowed[account][msg.sender]);
    }
}

////// contracts/openzeppelin/ERC20Burnable.sol
/* pragma solidity ^0.4.24; */

/* import "./ERC20.sol"; */

/**
 * @title Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
contract ERC20Burnable is ERC20 {
    /**
     * @dev Burns a specific amount of tokens.
     * @param value The amount of token to be burned.
     */
    function burn(uint256 value) public {
        _burn(msg.sender, value);
    }

    /**
     * @dev Burns a specific amount of tokens from the target address and decrements allowance
     * @param from address The address which you want to send tokens from
     * @param value uint256 The amount of token to be burned
     */
    function burnFrom(address from, uint256 value) public {
        _burnFrom(from, value);
    }
}

////// contracts/openzeppelin/ERC20Detailed.sol
/* pragma solidity ^0.4.24; */

/* import "./IERC20.sol"; */

/**
 * @title ERC20Detailed token
 * @dev The decimals are only for visualization purposes.
 * All the operations are done using the smallest and indivisible token unit,
 * just as on Ethereum all the operations are done in wei.
 */
contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    constructor (string name, string symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    /**
     * @return the name of the token.
     */
    function name() public view returns (string) {
        return _name;
    }

    /**
     * @return the symbol of the token.
     */
    function symbol() public view returns (string) {
        return _symbol;
    }

    /**
     * @return the number of decimals of the token.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }
}

////// contracts/Melon.sol
/* pragma solidity ^0.4.24; */

/* import "./openzeppelin/ERC20Burnable.sol"; */
/* import "./openzeppelin/ERC20Detailed.sol"; */
/* import "./openzeppelin/SafeMath.sol"; */

contract Melon is ERC20Burnable, ERC20Detailed {
    using SafeMath for uint;

    uint public constant BASE_UNITS = 10 ** 18;
    uint public constant INFLATION_ENABLE_DATE = 1551398400;
    uint public constant INITIAL_TOTAL_SUPPLY = uint(932613).mul(BASE_UNITS);
    uint public constant YEARLY_MINTABLE_AMOUNT = uint(300600).mul(BASE_UNITS);
    uint public constant MINTING_INTERVAL = 365 days;

    address public council;
    address public deployer;
    bool public initialSupplyMinted;
    uint public nextMinting = INFLATION_ENABLE_DATE;

    modifier onlyDeployer {
        require(msg.sender == deployer, "Only deployer can call this");
        _;
    }

    modifier onlyCouncil {
        require(msg.sender == council, "Only council can call this");
        _;
    }

    modifier anIntervalHasPassed {
        require(
            block.timestamp >= uint(nextMinting),
            "Please wait until an interval has passed"
        );
        _;
    }

    modifier inflationEnabled {
        require(
            block.timestamp >= INFLATION_ENABLE_DATE,
            "Inflation is not enabled yet"
        );
        _;
    }

    constructor(
        string _name,
        string _symbol,
        uint8 _decimals,
        address _council
    ) public ERC20Detailed(_name, _symbol, _decimals) {
        deployer = msg.sender;
        council = _council;
    }

    function changeCouncil(address _newCouncil) public onlyCouncil {
        council = _newCouncil;
    }

    function mintInitialSupply(address _initialReceiver) public onlyDeployer {
        require(!initialSupplyMinted, "Initial minting already complete");
        initialSupplyMinted = true;
        _mint(_initialReceiver, INITIAL_TOTAL_SUPPLY);
    }

    function mintInflation() public anIntervalHasPassed inflationEnabled {
        require(initialSupplyMinted, "Initial minting not complete");
        nextMinting = uint(nextMinting).add(MINTING_INTERVAL);
        _mint(council, YEARLY_MINTABLE_AMOUNT);
    }
}