pragma solidity ^0.4.24; 

contract ERC223 {
  uint public totalSupply;
  function balanceOf(address who) constant returns (uint);

  function name() constant returns (string _name);
  function symbol() constant returns (string _symbol);
  function decimals() constant returns (uint8 _decimals);
  function totalSupply() constant returns (uint256 _supply);

  function transfer(address to, uint value) returns (bool ok);
  function transfer(address to, uint value, bytes data) returns (bool ok);
  event Transfer(address indexed _from, address indexed _to, uint256 _value);
  event ERC223Transfer(address indexed _from, address indexed _to, uint256 _value, bytes _data);
}

contract ContractReceiver {
  function tokenFallback(address _from, uint _value, bytes _data);
}

contract ERC223Token is ERC223 {
  using SafeMath for uint;

  mapping(address => uint) balances;

  string public name;
  string public symbol;
  uint8 public decimals;
  uint256 public totalSupply;


  // Function to access name of token .
  function name() constant returns (string _name) {
      return name;
  }
  // Function to access symbol of token .
  function symbol() constant returns (string _symbol) {
      return symbol;
  }
  // Function to access decimals of token .
  function decimals() constant returns (uint8 _decimals) {
      return decimals;
  }
  // Function to access total supply of tokens .
  function totalSupply() constant returns (uint256 _totalSupply) {
      return totalSupply;
  }

  // Function that is called when a user or another contract wants to transfer funds .
  function transfer(address _to, uint _value, bytes _data) returns (bool success) {
    if(isContract(_to)) {
        return transferToContract(_to, _value, _data);
    }
    else {
        return transferToAddress(_to, _value, _data);
    }
}

  // Standard function transfer similar to ERC20 transfer with no _data .
  // Added due to backwards compatibility reasons .
  function transfer(address _to, uint _value) returns (bool success) {

    //standard function transfer similar to ERC20 transfer with no _data
    //added due to backwards compatibility reasons
    bytes memory empty;
    if(isContract(_to)) {
        return transferToContract(_to, _value, empty);
    }
    else {
        return transferToAddress(_to, _value, empty);
    }
}

//assemble the given address bytecode. If bytecode exists then the _addr is a contract.
  function isContract(address _addr) private returns (bool is_contract) {
      uint length;
      assembly {
            //retrieve the size of the code on target address, this needs assembly
            length := extcodesize(_addr)
        }
        if(length>0) {
            return true;
        }
        else {
            return false;
        }
    }

  //function that is called when transaction target is an address
  function transferToAddress(address _to, uint _value, bytes _data) private returns (bool success) {
    if (balanceOf(msg.sender) < _value) revert();
    balances[msg.sender] = balanceOf(msg.sender).sub(_value);
    balances[_to] = balanceOf(_to).add(_value);
    Transfer(msg.sender, _to, _value);
    ERC223Transfer(msg.sender, _to, _value, _data);
    return true;
  }

  //function that is called when transaction target is a contract
  function transferToContract(address _to, uint _value, bytes _data) private returns (bool success) {
    if (balanceOf(msg.sender) < _value) revert();
    balances[msg.sender] = balanceOf(msg.sender).sub(_value);
    balances[_to] = balanceOf(_to).add(_value);
    ContractReceiver reciever = ContractReceiver(_to);
    reciever.tokenFallback(msg.sender, _value, _data);
    Transfer(msg.sender, _to, _value);
    ERC223Transfer(msg.sender, _to, _value, _data);
    return true;
  }


  function balanceOf(address _owner) constant returns (uint balance) {
    return balances[_owner];
  }
}



/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0) {
      return 0;
    }
    uint256 c = a * b;
    assert(c / a == b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  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;
  }

  /**
  * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}




  

// change contract name to your contract's name
// i.e. "contract Bitcoin is ERC223Token"
contract BitUnits is ERC223Token {
  using SafeMath for uint256;

  // for example, "Bitcoin"
  string public name = "BitUnits";
  // for example, "BTC"
  string public symbol = "UNITX";
  // set token's precision
  // pick any number from 0 to 18
  // for example, 4 decimal points means that
  // smallest token using will be 0.0001 TKN
  uint public decimals = 8;
  // total supply of the token
  // for example, for Bitcoin it would be 21000000
  uint public totalSupply = 10000000 * (10**decimals);

  // Treasure is where ICO funds (ETH/ETC) will be forwarded
  // replace this address with your wallet address!
  // it is recommended that you create a paper wallet for this purpose
  address private treasury = 0xeb3C95a5CEB6Ae90f47380694F1922dFA1aed3C4;
  
  // ICO price. You will need to do a little bit of math to figure it out
  // given 4 decimals, this setting means "1 ETC = 50,000 TKN"
  uint256 private priceDiv = 2000000000;
  
  event Purchase(address indexed purchaser, uint256 amount);

  constructor() public {
    // This is how many tokens you want to allocate to yourself
    balances[msg.sender] = 10000000 * (10**decimals);
    // This is how many tokens you want to allocate for ICO
    balances[0x0] = 0 * (10**decimals);
  }

  function () public payable {
    bytes memory empty;
    if (msg.value == 0) { revert(); }
    uint256 purchasedAmount = msg.value.div(priceDiv);
    if (purchasedAmount == 0) { revert(); } // not enough ETC sent
    if (purchasedAmount > balances[0x0]) { revert(); } // too much ETC sent

    treasury.transfer(msg.value);
    balances[0x0] = balances[0x0].sub(purchasedAmount);
    balances[msg.sender] = balances[msg.sender].add(purchasedAmount);

    emit Transfer(0x0, msg.sender, purchasedAmount);
    emit ERC223Transfer(0x0, msg.sender, purchasedAmount, empty);
    emit Purchase(msg.sender, purchasedAmount);
  }
}