pragma solidity ^0.4.4;

contract Token {

    /// @return total amount of tokens
    function totalSupply() constant returns (uint256 supply) {}

    /// @param _owner The address from which the balance will be retrieved
    /// @return The balance
    function balanceOf(address _owner) constant returns (uint256 balance) {}

    /// @notice send `_value` token to `_to` from `msg.sender`
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return Whether the transfer was successful or not
    function transfer(address _to, uint256 _value) returns (bool success) {}

    /// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
    /// @param _from The address of the sender
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return Whether the transfer was successful or not
    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {}

    /// @notice `msg.sender` approves `_addr` to spend `_value` tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @param _value The amount of wei to be approved for transfer
    /// @return Whether the approval was successful or not
    function approve(address _spender, uint256 _value) returns (bool success) {}

    /// @param _owner The address of the account owning tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @return Amount of remaining tokens allowed to spent
    function allowance(address _owner, address _spender) constant returns (uint256 remaining) {}

    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);

}

/**
 * Math operations with safety checks
 */
contract SafeMath {
  function safeMul(uint a, uint b) internal returns (uint) {
    uint c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function safeDiv(uint a, uint b) internal returns (uint) {
    assert(b > 0);
    uint c = a / b;
    assert(a == b * c + a % b);
    return c;
  }

  function safeSub(uint a, uint b) internal returns (uint) {
    assert(b <= a);
    return a - b;
  }

  function safeAdd(uint a, uint b) internal returns (uint) {
    uint c = a + b;
    assert(c>=a && c>=b);
    return c;
  }

  function max64(uint64 a, uint64 b) internal constant returns (uint64) {
    return a >= b ? a : b;
  }

  function min64(uint64 a, uint64 b) internal constant returns (uint64) {
    return a < b ? a : b;
  }

  function max256(uint256 a, uint256 b) internal constant returns (uint256) {
    return a >= b ? a : b;
  }

  function min256(uint256 a, uint256 b) internal constant returns (uint256) {
    return a < b ? a : b;
  }

}

contract StandardToken is Token, SafeMath {

    function transfer(address _to, uint256 _value) returns (bool success) {
        if (balances[msg.sender] >= _value && _value > 0) {
            balances[msg.sender] -= _value;
            balances[_to] += _value;
            Transfer(msg.sender, _to, _value);
            return true;
        } else { return false; }
    }

    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
        if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
            balances[_to] += _value;
            balances[_from] -= _value;
            allowed[_from][msg.sender] -= _value;
            Transfer(_from, _to, _value);
            return true;
        } else { return false; }
    }

    function balanceOf(address _owner) constant returns (uint256 balance) {
        return balances[_owner];
    }

    function approve(address _spender, uint256 _value) returns (bool success) {
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
      return allowed[_owner][_spender];
    }

    mapping (address => uint256) balances;
    mapping (address => mapping (address => uint256)) allowed;
    uint256 public totalSupply;
}

contract NOVAToken is StandardToken {
	/**
     * Boolean contract states
     */
	bool public preIco = false; //Pre-ico state

	address public owner = 0x0;

    function () {
        //if ether is sent to this address, send it back.
        throw;
    }

    string public name;
    uint8 public decimals;
    string public symbol;
    string public version = 'H1.0';

    function NOVAToken() {
        balances[msg.sender] = 480000000000000;
        totalSupply = 480000000000000;
        name = "NOVA";
        decimals = 6;
        symbol = "NOVA";

		owner = msg.sender;
    }

	function price() returns (uint){
        return 3500;
    }

	function buy() public payable returns(bool) {
        processBuy(msg.sender, msg.value);

        return true;
    }

    function processBuy(address _to, uint256 _value) internal returns(bool) {
        require(_value>0);

        // Count expected tokens price
        uint tokens = _value * price();

        // Total tokens should be more than user want's to buy
        require(balances[owner]>tokens);

        // Add tokens to user balance and remove from totalSupply
        balances[_to] = safeAdd(balances[_to], tokens);
        // Remove sold tokens from total supply count
        balances[owner] = safeSub(balances[owner], tokens);

        // /* Emit log events */
        Transfer(owner, _to, tokens);

        return true;
    }

	function bounty(uint256 price) internal returns (uint256) {
		if (preIco) {
			return price + (price * 40/100);
        } else {
			return price + (price * 25/100);
        }
    }

	/**
     * Transfer bounty to target address from bounty pool
     */
	function sendBounty(address _to, uint256 _value) onlyOwner() {
        balances[_to] = safeAdd(balances[_to], _value);
        // /* Emit log events */
        Transfer(owner, _to, _value);
    }

    function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) {
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);

        if(!_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData)) { throw; }
        return true;
    }

	/**
     * Pre-ico state.
     */
    function setPreIco() onlyOwner() {
        preIco = true;
    }

    function unPreIco() onlyOwner() {
        preIco = false;
    }

	modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

}