pragma solidity ^0.4.23;

contract IERC223Token {
    function name() public view returns (string);
    function symbol() public view returns (string);
    function decimals() public view returns (uint8);
    function totalSupply() public view returns (uint256);
    function balanceOf(address _holder) public view returns (uint256);

    function transfer(address _to, uint256 _value) public returns (bool success);
    function transfer(address _to, uint _value, bytes _data) public returns (bool success);
    function transfer(address _to, uint _value, bytes _data, string _custom_fallback) public returns (bool success);
    
    event Transfer(address indexed _from, address indexed _to, uint _value, bytes _data);
}
contract IERC223Receiver {
  
   /**
 * @dev 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) public returns(bool);
}
contract IOwned {
    // this function isn't abstract since the compiler emits automatically generated getter functions as external
    function owner() public pure returns (address) {}

    event OwnerUpdate(address _prevOwner, address _newOwner);

    function transferOwnership(address _newOwner) public;
    function acceptOwnership() public;
}

contract ICalled is IOwned {
    // this function isn't abstract since the compiler emits automatically generated getter functions as external
    function callers(address) public pure returns (bool) { }

    function appendCaller(address _caller) public;  // ownerOnly
    function removeCaller(address _caller) public;  // ownerOnly
    
    event AppendCaller(ICaller _caller);
    event RemoveCaller(ICaller _caller);
}

contract ICaller{
	function calledUpdate(address _oldCalled, address _newCalled) public;  // ownerOnly
	
	event CalledUpdate(address _oldCalled, address _newCalled);
}
contract IERC20Token {
    function name() public view returns (string);
    function symbol() public view returns (string);
    function decimals() public view returns (uint8);
    function totalSupply() public view returns (uint256);
    function balanceOf(address _holder) public view returns (uint256);
    function allowance(address _from, address _spender) public view returns (uint256);

    function transfer(address _to, uint256 _value) public returns (bool success);
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);
    function approve(address _spender, uint256 _value) public returns (bool success);
    
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _holder, address indexed _spender, uint256 _value);
}
contract IDummyToken is IERC20Token, IERC223Token, IERC223Receiver, ICaller, IOwned{
    // these function isn't abstract since the compiler emits automatically generated getter functions as external
    function operator() public pure returns(ITokenOperator) {}
    //ITokenOperator public operator;
}
contract ISmartToken{
    function disableTransfers(bool _disable) public;
    function issue(address _to, uint256 _amount) public;
    function destroy(address _from, uint256 _amount) public;
	//function() public payable;
}
contract ITokenOperator is ISmartToken, ICalled, ICaller {
    // this function isn't abstract since the compiler emits automatically generated getter functions as external
    function dummy() public pure returns (IDummyToken) {}
    
	function emitEventTransfer(address _from, address _to, uint256 _amount) public;

    function updateChanges(address) public;
    function updateChangesByBrother(address, uint256, uint256) public;
    
    function token_name() public view returns (string);
    function token_symbol() public view returns (string);
    function token_decimals() public view returns (uint8);
    
    function token_totalSupply() public view returns (uint256);
    function token_balanceOf(address _owner) public view returns (uint256);
    function token_allowance(address _from, address _spender) public view returns (uint256);

    function token_transfer(address _from, address _to, uint256 _value) public returns (bool success);
    function token_transfer(address _from, address _to, uint _value, bytes _data) public returns (bool success);
    function token_transfer(address _from, address _to, uint _value, bytes _data, string _custom_fallback) public returns (bool success);
    function token_transferFrom(address _spender, address _from, address _to, uint256 _value) public returns (bool success);
    function token_approve(address _from, address _spender, uint256 _value) public returns (bool success);
    
    function fallback(address _from, bytes _data) public payable;                      		// eth input
    function token_fallback(address _token, address _from, uint _value, bytes _data) public returns(bool);    // token input from IERC233
}

contract IsContract {
	//assemble the given address bytecode. If bytecode exists then the _addr is a contract.
    function isContract(address _addr) internal view returns (bool is_contract) {
        uint length;
        assembly {
              //retrieve the size of the code on target address, this needs assembly
              length := extcodesize(_addr)
        }
        return (length>0);
    }
}
   contract Owned is IOwned {
    address public owner;
    address public newOwner;

    /**
        @dev constructor
    */
    constructor() public {
        owner = msg.sender;
    }

    // allows execution by the owner only
    modifier ownerOnly {
        assert(msg.sender == owner);
        _;
    }

    /**
        @dev allows transferring the contract ownership
        the new owner still needs to accept the transfer
        can only be called by the contract owner

        @param _newOwner    new contract owner
    */
    function transferOwnership(address _newOwner) public ownerOnly {
        require(_newOwner != owner);
        newOwner = _newOwner;
    }

    /**
        @dev used by a new owner to accept an ownership transfer
    */
    function acceptOwnership() public {
        require(msg.sender == newOwner);
        emit OwnerUpdate(owner, newOwner);
        owner = newOwner;
        newOwner = address(0x0);
    }
}
contract DummyToken is IDummyToken, Owned, IsContract {
    ITokenOperator public operator = ITokenOperator(msg.sender);
    
    function calledUpdate(address _oldCalled, address _newCalled) public ownerOnly {
        if(operator == _oldCalled) {
            operator = ITokenOperator(_newCalled);
        	emit CalledUpdate(_oldCalled, _newCalled);
		}
    }
    
    function name() public view returns (string){
        return operator.token_name();
    }
    function symbol() public view returns (string){
        return operator.token_symbol();
    }
    function decimals() public view returns (uint8){
        return operator.token_decimals();
    }
    
    function totalSupply() public view returns (uint256){
        return operator.token_totalSupply();
    }
    function balanceOf(address addr)public view returns(uint256){
        return operator.token_balanceOf(addr);
    }
    function allowance(address _from, address _spender) public view returns (uint256){
        return operator.token_allowance(_from, _spender);
    }
    
    function transfer(address _to, uint256 _value) public returns (bool success){
        success = operator.token_transfer(msg.sender, _to, _value);
        bytes memory emptyBytes;
        internalTokenFallback(msg.sender, _to, _value, emptyBytes);
        emit Transfer(msg.sender, _to, _value);
    }
    function transfer(address _to, uint _value, bytes _data) public returns (bool success){
        success = operator.token_transfer(msg.sender, _to, _value, _data);
        internalTokenFallback(msg.sender, _to, _value, _data);
        emit Transfer(msg.sender, _to, _value);
    }
    function transfer(address _to, uint _value, bytes _data, string _custom_fallback) public returns (bool success){
        success = operator.token_transfer(msg.sender, _to, _value, _data, _custom_fallback);
        internalTokenFallback(msg.sender, _to, _value, _data);
        emit Transfer(msg.sender, _to, _value);
    }

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success){
        success = operator.token_transferFrom(msg.sender, _from, _to, _value);
        emit Transfer(_from, _to, _value);
        
        bytes memory emptyBytes;
		if(msg.sender == address(operator) && _from == address(this))				// for issue
			internalTokenFallback(_from, _to, _value, emptyBytes);
    }
    function approve(address _spender, uint256 _value) public returns (bool success){
        success = operator.token_approve(msg.sender, _spender, _value);
        emit Approval(msg.sender, _spender, _value);
    }
    
    function() public payable {
        operator.fallback.value(msg.value)(msg.sender, msg.data);
	}
	
    function tokenFallback(address _from, uint _value, bytes _data) public returns(bool){
        return operator.token_fallback(msg.sender, _from, _value, _data);
    }

    function internalTokenFallback(address _from, address _to, uint256 _value, bytes _data)internal{
        if(isContract(_to)){
           require(IERC223Receiver(_to).tokenFallback(_from, _value, _data));
        }
    }
}

{
  "compilationTarget": {
    "DummyToken.sol": "DummyToken"
  },
  "evmVersion": "byzantium",
  "libraries": {},
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}