contract VTest is StandardToken, Ownable {
    address public icoAccount       = address(0x8Df21F9e41Dd7Bd681fcB6d49248f897595a5304);  // ICO Token holder
	address public marketingAccount = address(0x83313B9c27668b41151509a46C1e2a8140187362);  // Marketing Token holder
	address public advisorAccount   = address(0xB6763FeC658338A7574a796Aeda45eb6D81E69B9);  // Advisor Token holder
	mapping(address => bool) public owners;
	
	string public name   = "VTest";  // set Token name
	string public symbol = "VT";       // set Token symbol
	uint public decimals = 18;
	uint public INITIAL_SUPPLY = 10000000000 * (10 ** uint256(decimals));  // set Token total supply
	
	mapping(address => bool) public icoProceeding; // ico manage
	
	bool public released      = false;   // all lock
    uint8 public transferStep = 0;       // avail step
	bool public stepLockCheck = true;    // step lock
    mapping(uint8 => mapping(address => bool)) public holderStep; // holder step
	
	event ReleaseToken(address _owner, bool released);
	event ChangeTransferStep(address _owner, uint8 newStep);
	
	/**
     * Constructor function
     * Initializes contract with initial supply tokens to the creator of the contract
     */ 
	constructor() public {
	    require(msg.sender != address(0));
		totalSupply_ = INITIAL_SUPPLY;      // Set total supply
		balances[msg.sender] = INITIAL_SUPPLY;
		emit Transfer(0x0, msg.sender, INITIAL_SUPPLY);
		
		super.transfer(icoAccount, INITIAL_SUPPLY.mul(45).div(100));       // 45% allocation to ICO account
		super.transfer(marketingAccount, INITIAL_SUPPLY.mul(15).div(100)); // 15% allocation to Marketing account
		super.transfer(advisorAccount, INITIAL_SUPPLY.mul(10).div(100));   // 10% allocation to Advisor account
		
		
		// set owners
		owners[msg.sender] = true;
		owners[icoAccount] = true;
		owners[marketingAccount] = true;
		owners[advisorAccount] = true;
		
		holderStep[0][msg.sender] = true;
		holderStep[0][icoAccount] = true;
		holderStep[0][marketingAccount] = true;
		holderStep[0][advisorAccount] = true;
    }	
	/**
     * ICO list management
     */
	function registIcoAddress(address _icoAddress) onlyOwner public {
	    require(_icoAddress != address(0));
	    require(!icoProceeding[_icoAddress]);
	    icoProceeding[_icoAddress] = true;
	}
	function unregisttIcoAddress(address _icoAddress) onlyOwner public {
	    require(_icoAddress != address(0));
	    require(icoProceeding[_icoAddress]);
	    icoProceeding[_icoAddress] = false;
	}
	/**
     * Token lock management
     */
	function releaseToken() onlyOwner public {
	    require(!released);
	    released = true;
	    emit ReleaseToken(msg.sender, released);
	}
	function lockToken() onlyOwner public {
		require(released);
		released = false;
		emit ReleaseToken(msg.sender, released); 
	}	
	function changeTransferStep(uint8 _changeStep) onlyOwner public {
	    require(transferStep != _changeStep);
	    require(_changeStep >= 0 && _changeStep < 10);
        transferStep = _changeStep;
        emit ChangeTransferStep(msg.sender, _changeStep);
	}
	function changeTransferStepLock(bool _stepLock) onlyOwner public {
	    require(stepLockCheck != _stepLock);
	    stepLockCheck = _stepLock;
	}
	
	/**
     * Check the token and step lock
     */
	modifier onlyReleased() {
	    require(released);
	    _;
	}
	modifier onlyStepUnlock(address _funderAddr) {
	    if (!owners[_funderAddr]) {
	        if (stepLockCheck) {
    		    require(checkHolderStep(_funderAddr));
	        }    
	    }
	    _;
	}
	
	/**
     * Regist holder step
     */
    function registHolderStep(address _contractAddr, uint8 _icoStep, address _funderAddr) public returns (bool) {
		require(icoProceeding[_contractAddr]);
		require(_icoStep > 0);
        holderStep[_icoStep][_funderAddr] = true;
        
        return true;
    }
	/**
     * Check the funder step lock
     */
	function checkHolderStep(address _funderAddr) public view returns (bool) {
		bool returnBool = false;        
        for (uint8 i = transferStep; i >= 1; i--) {
            if (holderStep[i][_funderAddr]) {
                returnBool = true;
                break;
            }
        }
		return returnBool;
	}
	
	
	/**
	 * Override ERC20 interface funtion, To verify token release
	 */
	function transfer(address to, uint256 value) public onlyReleased onlyStepUnlock(msg.sender) returns (bool) {
	    return super.transfer(to, value);
    }
    function allowance(address owner, address spender) public onlyReleased view returns (uint256) {
        return super.allowance(owner,spender);
    }
    function transferFrom(address from, address to, uint256 value) public onlyReleased onlyStepUnlock(msg.sender) returns (bool) {
        
        return super.transferFrom(from, to, value);
    }
    function approve(address spender, uint256 value) public onlyReleased returns (bool) {
        return super.approve(spender,value);
    }
	// Only the owner can manage burn function
	function burn(uint256 _value) public onlyOwner returns (bool success) {
		return super.burn(_value);
	}
	function burnFrom(address _from, uint256 _value) public onlyOwner returns (bool success) {
		return super.burnFrom(_from, _value);
	}
	
    function transferSoldToken(address _contractAddr, address _to, uint256 _value) public returns(bool) {
	    require(icoProceeding[_contractAddr]);
	    require(balances[icoAccount] >= _value);
	    balances[icoAccount] = balances[icoAccount].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(icoAccount, _to, _value);
        return true;
	}
	function transferBonusToken(address _to, uint256 _value) public onlyOwner returns(bool) {
	    require(balances[icoAccount] >= _value);
	    balances[icoAccount] = balances[icoAccount].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(icoAccount, _to, _value);
		return true;
	}
	function transferAdvisorToken(address _to, uint256 _value)  public onlyOwner returns (bool) {
	    require(balances[advisorAccount] >= _value);
	    balances[advisorAccount] = balances[advisorAccount].sub(_value);
		balances[_to] = balances[_to].add(_value);
		emit Transfer(advisorAccount, _to, _value);
		return true;
	}
}
/**
 * @title VTest
 * @dev Token that implements the erc20 interface
 */
function registHolderStep(address _contractAddr, uint8 _icoStep, address _funderAddr) public returns (bool) {
quire(icoProceeding[_contractAddr]);
quire(_icoStep > 0);
    holderStep[_icoStep][_funderAddr] = true;
        
    return true;
}

/**
 * Regist holder step
 */