contract TokenOWL is Proxied, GnosisStandardToken {
    using GnosisMath for *;

    string public constant name = "OWL Token";
    string public constant symbol = "OWL";
    uint8 public constant decimals = 18;

    struct masterCopyCountdownType {
        address masterCopy;
        uint timeWhenAvailable;
    }

    masterCopyCountdownType masterCopyCountdown;

    address public creator;
    address public minter;

    event Minted(address indexed to, uint256 amount);
    event Burnt(address indexed from, address indexed user, uint256 amount);

    modifier onlyCreator() {
        // R1
        require(msg.sender == creator, "Only the creator can perform the transaction");
        _;
    }
    /// @dev trickers the update process via the proxyMaster for a new address _masterCopy
    /// updating is only possible after 30 days
    function startMasterCopyCountdown(address _masterCopy) public onlyCreator {
        require(address(_masterCopy) != address(0), "The master copy must be a valid address");

        // Update masterCopyCountdown
        masterCopyCountdown.masterCopy = _masterCopy;
        masterCopyCountdown.timeWhenAvailable = now + 30 days;
    }

    /// @dev executes the update process via the proxyMaster for a new address _masterCopy
    function updateMasterCopy() public onlyCreator {
        require(address(masterCopyCountdown.masterCopy) != address(0), "The master copy must be a valid address");
        require(
            block.timestamp >= masterCopyCountdown.timeWhenAvailable,
            "It's not possible to update the master copy during the waiting period"
        );

        // Update masterCopy
        masterCopy = masterCopyCountdown.masterCopy;
    }

    function getMasterCopy() public view returns (address) {
        return masterCopy;
    }

    /// @dev Set minter. Only the creator of this contract can call this.
    /// @param newMinter The new address authorized to mint this token
    function setMinter(address newMinter) public onlyCreator {
        minter = newMinter;
    }

    /// @dev change owner/creator of the contract. Only the creator/owner of this contract can call this.
    /// @param newOwner The new address, which should become the owner
    function setNewOwner(address newOwner) public onlyCreator {
        creator = newOwner;
    }

    /// @dev Mints OWL.
    /// @param to Address to which the minted token will be given
    /// @param amount Amount of OWL to be minted
    function mintOWL(address to, uint amount) public {
        require(minter != address(0), "The minter must be initialized");
        require(msg.sender == minter, "Only the minter can mint OWL");
        balances[to] = balances[to].add(amount);
        totalTokens = totalTokens.add(amount);
        emit Minted(to, amount);
        emit Transfer(address(0), to, amount);
    }

    /// @dev Burns OWL.
    /// @param user Address of OWL owner
    /// @param amount Amount of OWL to be burnt
    function burnOWL(address user, uint amount) public {
        allowances[user][msg.sender] = allowances[user][msg.sender].sub(amount);
        balances[user] = balances[user].sub(amount);
        totalTokens = totalTokens.sub(amount);
        emit Burnt(msg.sender, user, amount);
        emit Transfer(user, address(0), amount);
    }

    function getMasterCopyCountdown() public view returns (address, uint) {
        return (masterCopyCountdown.masterCopy, masterCopyCountdown.timeWhenAvailable);
    }
}
function burnOWL(address user, uint amount) public {
        allowances[user][msg.sender] = allowances[user][msg.sender].sub(amount);
        balances[user] = balances[user].sub(amount);
        totalTokens = totalTokens.sub(amount);
        emit Burnt(msg.sender, user, amount);
        emit Transfer(user, address(0), amount);
    }
/// @dev Burns OWL.
/// @param user Address of OWL owner
/// @param amount Amount of OWL to be burnt