contract BPSToken is Ownable {
    using SafeMath for uint;

    string public name = "Biometric Payment System Token";
    string public symbol = "BPST";
    uint8 public decimals = 18;
    uint256 public totalSupply;

    bool public mintingFinished = false;
    bool public released = false;

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

    event NewToken(address _token);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Burned(address burner, uint burnedAmount);
    event OwnerReclaim(address fromWhom, uint amount);
    event MintFinished();
    event MintReopen();
    event Released();

    modifier canMint() {
        require(!mintingFinished);
        _;
    }

    modifier canTransfer() {
        require(msg.sender == owner || released == true);
        _;
    }

    constructor () public {
        emit NewToken(address(this));
    }

    /**
     * @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) public onlyOwner canMint returns (bool) {
        totalSupply = totalSupply.add(_amount);
        balances[_to] = balances[_to].add(_amount);
        emit Transfer(address(0), _to, _amount);
        return true;
    }

    /**
     * @dev Function to burn tokens from {msg.sender}.
     */
    function burn(uint burnAmount) public {
        address burner = msg.sender;
        balances[burner] = balances[burner].sub(burnAmount);
        totalSupply = totalSupply.sub(burnAmount);
        emit Burned(burner, burnAmount);
    }

    /**
     * @dev Function to stop minting new tokens.
     */
    function finishMinting() public onlyOwner {
        mintingFinished = true;
        emit MintFinished();
    }

    /**
     * @dev function to reopen minting new tokens
     */
    function openMinting() public onlyOwner {
        mintingFinished = false;
        emit MintReopen();
    }

    /**
     * @dev function to allow token transfer
     */
    function release() public onlyOwner {
        released = true;
        emit Released();
    }

    /**
     * @dev the owner can reclaim the tokens from a participant if the {_fromWhom} KYC failed and
     * the token is not released yet. Refund will be handled offband.
     */
    function transferToOwner(address _fromWhom) public onlyOwner {
        if (released) revert();

        uint amount = balanceOf(_fromWhom);
        balances[_fromWhom] = balances[_fromWhom].sub(amount);
        balances[owner] = balances[owner].add(amount);
        emit Transfer(_fromWhom, owner, amount);
        emit OwnerReclaim(_fromWhom, amount);
    }

    /**
    * @dev transfer token for a specified address
    * @param _to The address to transfer to.
    * @param _value The amount to be transferred.
    */
    function transfer(address _to, uint256 _value) public canTransfer returns (bool) {
        require(_to != address(0));
        require(_value <= balances[msg.sender]);

        // SafeMath.sub will throw if there is not enough balance.
        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(msg.sender, _to, _value);
        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 _value uint256 the amount of tokens to be transferred
     */
    function transferFrom(address _from, address _to, uint256 _value) public canTransfer returns (bool) {
        require(_to != address(0));
        require(_value <= balances[_from]);
        require(_value <= allowed[_from][msg.sender]);

        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        emit Transfer(_from, _to, _value);
        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;
        emit 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 view 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);
        emit 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);
        }
        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }

    /**
    * @dev Gets the balance of the specified address.
    * @param _owner The address to query the the balance of.
    * @return An uint256 representing the amount owned by the passed address.
    */
    function balanceOf(address _owner) public view returns (uint256 balance) {
        return balances[_owner];
    }
}
/**
 *  @title Contract for BPS Token
 *  July 2018, Igor Milos
 */
function transfer(address _to, uint256 _value) public canTransfer returns (bool) {
    require(_to != address(0));
    require(_value <= balances[msg.sender]);

    // SafeMath.sub will throw if there is not enough balance.
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    emit Transfer(msg.sender, _to, _value);
    return true;
}

/**
 * @dev transfer token for a specified address
 * @param _to The address to transfer to.
 * @param _value The amount to be transferred.
 */