contract Token is ERC20, Ownable {

    using SafeMath for uint;
    // Public variables of the token
    string public name;
    string public symbol;
    uint public decimals; // How many decimals to show.
    string public version = "v0.1";
    uint public totalSupply;
    bool public locked;
    address public crowdSaleAddress;

    mapping(address => uint) public balances;
    mapping(address => mapping(address => uint)) public allowed;
    
    // Lock transfer during the ICO
    modifier onlyUnlocked() {
        if (msg.sender != crowdSaleAddress && locked && msg.sender != owner) 
            revert();
        _;
    }

    modifier onlyAuthorized() {
        if (msg.sender != crowdSaleAddress && msg.sender != owner) 
            revert();
        _;
    }

    // The Token constructor     
    function Token(uint _initialSupply,
            string _tokenName,
            uint _decimalUnits,
            string _tokenSymbol,
            string _version,
            address _crowdSaleAddress) public {      
        locked = true;  // Lock the transfer of tokens during the crowdsale
        totalSupply = _initialSupply * (10**_decimalUnits);     
                                        
        name = _tokenName; // Set the name for display purposes
        symbol = _tokenSymbol; // Set the symbol for display purposes
        decimals = _decimalUnits; // Amount of decimals for display purposes
        version = _version;
        crowdSaleAddress = _crowdSaleAddress;              
        balances[crowdSaleAddress] = totalSupply;   
    }

    function unlock() public onlyAuthorized {
        locked = false;
    }

    function lock() public onlyAuthorized {
        locked = true;
    }

    function burn(address _member, uint256 _value) public onlyAuthorized returns(bool) {
        require(balances[_member] >= _value);
        balances[_member] -= _value;
        totalSupply -= _value;
        Transfer(_member, 0x0, _value);
        return true;
    }

   
    // @notice transfer tokens to given address
    // @param _to {address} address or recipient
    // @param _value {uint} amount to transfer
    // @return  {bool} true if successful
    function transfer(address _to, uint _value) public onlyUnlocked returns(bool) {

        require(_to != address(0));
        require(balances[msg.sender] >= _value);
        balances[msg.sender] -= _value;
        balances[_to] += _value;
        Transfer(msg.sender, _to, _value);
        return true;
    }

    // @notice transfer tokens from given address to another address
    // @param _from {address} from whom tokens are transferred
    // @param _to {address} to whom tokens are transferred
    // @param _value {uint} amount of tokens to transfer
    // @return  {bool} true if successful
    function transferFrom(address _from, address _to, uint256 _value) public onlyUnlocked returns(bool success) {

        require(_to != address(0));
        require(balances[_from] >= _value); // Check if the sender has enough
        require(_value <= allowed[_from][msg.sender]); // Check if allowed is greater or equal
        balances[_from] -= _value; // Subtract from the sender
        balances[_to] += _value; // Add the same to the recipient
        allowed[_from][msg.sender] -= _value;  // adjust allowed
        Transfer(_from, _to, _value);
        return true;
    }

      // @notice to query balance of account
    // @return _owner {address} address of user to query balance
    function balanceOf(address _owner) public view returns(uint balance) {
        return balances[_owner];
    }

    /**
    * @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, uint _value) public returns(bool) {
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    // @notice to query of allowance of one user to the other
    // @param _owner {address} of the owner of the account
    // @param _spender {address} of the spender of the account
    // @return remaining {uint} amount of remaining allowance
    function allowance(address _owner, address _spender) public view returns(uint 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;
    }

}
// The  token
function approve(address _spender, uint _value) public returns(bool) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _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.
 */