package horstmann.ch02_mail;
/**
   Connects a phone to the mail system. The purpose of this
   class is to keep track of the state of a connection, since
   the phone itself is just a source of individual key presses.
 */
@SuppressWarnings("all")
public class Connection
{
        /**
      Construct a Connection object.
      @param s a MailSystem object
      @param p a Telephone object
         */
        public Connection(MailSystem s, Telephone p)
        {
                system = s;
                phone = p;
                resetConnection();
        }

        /**
      Respond to the user's pressing a key on the phone touchpad
      @param key the phone key pressed by the user
         */
        public void dial(String key)
        {
                if (state == CONNECTED)
                        connect(key);
                else if (state == RECORDING)
                        login(key);
                else if (state == CHANGE_PASSCODE)
                        changePasscode(key);
                else if (state == CHANGE_GREETING)
                        changeGreeting(key);
                else if (state == MAILBOX_MENU)
                        mailboxMenu(key);
                else if (state == MESSAGE_MENU)
                        messageMenu(key);
        }

        /**
      Record voice.
      @param voice voice spoken by the user
         */
        public void record(String voice)
        {
                if (state == RECORDING || state == CHANGE_GREETING)
                        currentRecording += voice;
        }

        /**
      The user hangs up the phone.
         */
        public void hangup()
        {
                if (state == RECORDING)
                        currentMailbox.addMessage(new Message(currentRecording));
                resetConnection();
        }

        /**
      Reset the connection to the initial state and prompt
      for mailbox number
         */
        private void resetConnection()
        {
                currentRecording = "";
                accumulatedKeys = "";
                state = CONNECTED;
                phone.speak(INITIAL_PROMPT);
        }

        /**
      Try to connect the user with the specified mailbox.
      @param key the phone key pressed by the user
         */
        private void connect(String key)
        {
                if (key.equals("#"))
                {
                        currentMailbox = system.findMailbox(accumulatedKeys);
                        if (currentMailbox != null)
                        {
                                state = RECORDING;
                                phone.speak(currentMailbox.getGreeting());
                        }
                        else
                                phone.speak("Incorrect mailbox number. Try again!");
                        accumulatedKeys = "";
                }
                else
                        accumulatedKeys += key;
        }

        /**
      Try to log in the user.
      @param key the phone key pressed by the user
         */
        private void login(String key)
        {
                if (key.equals("#"))
                {
                        if (currentMailbox.checkPasscode(accumulatedKeys))
                        {
                                state = MAILBOX_MENU;
                                phone.speak(MAILBOX_MENU_TEXT);
                        }
                        else
                                phone.speak("Incorrect passcode. Try again!");
                        accumulatedKeys = "";
                }
                else
                        accumulatedKeys += key;
        }

        /**
      Change passcode.
      @param key the phone key pressed by the user
         */
        private void changePasscode(String key)
        {
                if (key.equals("#"))
                {
                        currentMailbox.setPasscode(accumulatedKeys);
                        state = MAILBOX_MENU;
                        phone.speak(MAILBOX_MENU_TEXT);
                        accumulatedKeys = "";
                }
                else
                        accumulatedKeys += key;
        }

        /**
      Change greeting.
      @param key the phone key pressed by the user
         */
        private void changeGreeting(String key)
        {
                if (key.equals("#"))
                {
                        currentMailbox.setGreeting(currentRecording);
                        currentRecording = "";
                        state = MAILBOX_MENU;
                        phone.speak(MAILBOX_MENU_TEXT);
                }
        }

        /**
      Respond to the user's selection from mailbox menu.
      @param key the phone key pressed by the user
         */
        private void mailboxMenu(String key)
        {
                if (key.equals("1"))
                {
                        state = MESSAGE_MENU;
                        phone.speak(MESSAGE_MENU_TEXT);
                }
                else if (key.equals("2"))
                {
                        state = CHANGE_PASSCODE;
                        phone.speak("Enter new passcode followed by the # key");
                }
                else if (key.equals("3"))
                {
                        state = CHANGE_GREETING;
                        phone.speak("Record your greeting, then press the # key");
                }
        }

        /**
      Respond to the user's selection from message menu.
      @param key the phone key pressed by the user
         */
        private void messageMenu(String key)
        {
                if (key.equals("1"))
                {
                        String output = "";
                        Message m = currentMailbox.getCurrentMessage();
                        if (m == null) output += "No messages." + "\n";
                        else output += m.getText() + "\n";
                        output += MESSAGE_MENU_TEXT;
                        phone.speak(output);
                }
                else if (key.equals("2"))
                {
                        currentMailbox.saveCurrentMessage();
                        phone.speak(MESSAGE_MENU_TEXT);
                }
                else if (key.equals("3"))
                {
                        currentMailbox.removeCurrentMessage();
                        phone.speak(MESSAGE_MENU_TEXT);
                }
                else if (key.equals("4"))
                {
                        state = MAILBOX_MENU;
                        phone.speak(MAILBOX_MENU_TEXT);
                }
        }

        private MailSystem system;
        private Mailbox currentMailbox;
        private String currentRecording;
        private String accumulatedKeys;
        private Telephone phone;
        private int state;

        private static final int DISCONNECTED = 0;
        private static final int CONNECTED = 1;
        private static final int RECORDING = 2;
        private static final int MAILBOX_MENU = 3;
        private static final int MESSAGE_MENU = 4;
        private static final int CHANGE_PASSCODE = 5;
        private static final int CHANGE_GREETING = 6;

        private static final String INITIAL_PROMPT =
                        "Enter mailbox number followed by #";
        private static final String MAILBOX_MENU_TEXT =
                        "Enter 1 to listen to your messages\n"
                                        + "Enter 2 to change your passcode\n"
                                        + "Enter 3 to change your greeting";
        private static final String MESSAGE_MENU_TEXT =
                        "Enter 1 to listen to the current message\n"
                                        + "Enter 2 to save the current message\n"
                                        + "Enter 3 to delete the current message\n"
                                        + "Enter 4 to return to the main menu";
}