contract StyrasToken is MintableToken {
  
    using SafeMath for uint256;

    string public name = "Styras";
    string public symbol = "STY";
    uint256 public decimals = 18;

    uint256 public reservedSupply;

    uint256 public publicLockEnd = 1516060800; // GMT: Tuesday, January 16, 2018 0:00:00
    uint256 public partnersLockEnd = 1530230400; // GMT: Friday, June 29, 2018 0:00:00
    uint256 public partnersMintLockEnd = 1514678400; // GMT: Sunday, December 31, 2017 0:00:00

    address public partnersWallet;
    mapping(address => uint256) balances;
    mapping (address => mapping (address => uint256)) internal allowed;

    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Burn(address indexed burner, uint256 value);

    /**
     * Initializes contract with initial supply tokens to the creator of the contract
     */
    function StyrasToken(address partners, uint256 reserved) public {
        require(partners != address(0));
        partnersWallet = partners;
        reservedSupply = reserved;
        assert(publicLockEnd <= partnersLockEnd);
        assert(partnersMintLockEnd < partnersLockEnd);
    }

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

    /**
     * @dev transfer token for a specified address
     * @param _to The address to transfer to.
     * @param _amount The amount to be transferred.
     */
    function transfer(address _to, uint256 _amount) public returns (bool) {
        require(_to != address(0));
        require((msg.sender != partnersWallet && now >= publicLockEnd) || now >= partnersLockEnd);
        require(_amount > 0 && _amount <= balances[msg.sender]);
        balances[msg.sender] = balances[msg.sender].sub(_amount);
        balances[_to] = balances[_to].add(_amount);
        Transfer(msg.sender, _to, _amount);
        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 _amount uint256 the amount of tokens to be transferred
     */
    function transferFrom(address _from, address _to, uint256 _amount) public returns (bool) {
        require(_to != address(0));
        require((_from != partnersWallet && now >= publicLockEnd) || now >= partnersLockEnd);
        require(_amount > 0 && _amount <= balances[_from]);
        require(_amount <= allowed[_from][msg.sender]);
        balances[_from] = balances[_from].sub(_amount);
        balances[_to] = balances[_to].add(_amount);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_amount);
        Transfer(_from, _to, _amount);
        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;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    /**
     * @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 constant returns (uint256 remaining) {
        return allowed[_owner][_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
     */
    function increaseApproval (address _spender, uint _addedValue) public returns (bool success) {
        allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
        Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }

    function decreaseApproval (address _spender, uint _subtractedValue) public returns (bool success) {
        uint oldValue = allowed[msg.sender][_spender];
        if (_subtractedValue > oldValue) {
            allowed[msg.sender][_spender] = 0;
        } else {
            allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
        }
        Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }

    /**
     * @dev Burns a specific amount of tokens.
     * @param _value The amount of token to be burned.
     */
    function burn(uint256 _value) public {
        require((msg.sender != partnersWallet && now >= publicLockEnd) || now >= partnersLockEnd);
        require(_value > 0 && _value <= balances[msg.sender]);
        address burner = msg.sender;
        balances[burner] = balances[burner].sub(_value);
        totalSupply = totalSupply.sub(_value);
        Burn(burner, _value);
    }

    /**
     * @dev Function to mint tokens
     * @param _to The address that will receive the minted tokens.
     * @param _amount The amount of tokens to mint.
     * @return A boolean that indicates if the operation was successful.
     */
    function mint(address _to, uint256 _amount) onlyOwner canMint public returns (bool) {
        require(_to != partnersWallet);
        totalSupply = totalSupply.add(_amount);
        balances[_to] = balances[_to].add(_amount);
        Mint(_to, _amount);
        Transfer(address(0), _to, _amount);
        return true;
    }

    /**
     * @dev Function to mint reserved tokens to partners
     * @return A boolean that indicates if the operation was successful.
     */
    function mintPartners(uint256 amount) onlyOwner canMint public returns (bool) {
        require(now >= partnersMintLockEnd);
        require(reservedSupply > 0);
        require(amount <= reservedSupply);
        totalSupply = totalSupply.add(amount);
        reservedSupply = reservedSupply.sub(amount);
        balances[partnersWallet] = balances[partnersWallet].add(amount);
        Mint(partnersWallet, amount);
        Transfer(address(0), partnersWallet, amount);
        return true;
    }
  
}
/**
 * @title Extended ERC20 Token contract
 * @dev Custom Token (ERC20 Token) transactions.
 */
function transferFrom(address _from, address _to, uint256 _amount) public returns (bool) {
    require(_to != address(0));
    require((_from != partnersWallet && now >= publicLockEnd) || now >= partnersLockEnd);
    require(_amount > 0 && _amount <= balances[_from]);
    require(_amount <= allowed[_from][msg.sender]);
    balances[_from] = balances[_from].sub(_amount);
    balances[_to] = balances[_to].add(_amount);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_amount);
    Transfer(_from, _to, _amount);
    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 _amount uint256 the amount of tokens to be transferred
 */