AnsweringMachine.sol

pragma solidity ^0.4.11;

contract AnsweringMachine {
  enum Status {
    Here,
    Busy,
    Away
  }

  struct AwayStatus {
    Status status;
    uint updatedAt;
  }

  struct AwayMessage {
    uint messageHash;
    uint updatedAt;
  }

  struct Message {
    address sender;
    uint messageHash;
    uint receivedAt;
  }

  address public owner;
  AwayStatus public awayStatus;
  AwayMessage public awayMessage;

  Message[] public inbox;

  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  function AnsweringMachine() {
    owner = msg.sender;
  }

  function setStatus(Status newStatus) onlyOwner {
    awayStatus.status = newStatus;
    awayStatus.updatedAt = block.number;
  }

  function setAwayMessage(uint newAwayMessage) onlyOwner {
    awayMessage.messageHash = newAwayMessage;
    awayMessage.updatedAt = block.number;
  }

  function leaveMessage(uint message) public {
    inbox.push(Message(msg.sender, message, block.number));
  }

  function deleteMessage(uint index) onlyOwner {
    inbox[index] = inbox[inbox.length - 1];
    inbox.length--;
  }

  function clearInbox() onlyOwner {
    delete inbox;
  }
}