package Question8_7;

import java.util.Date;

import java.util.HashMap;

/* UserManager serves as the central place for the core user actions. */

public class UserManager {

private static UserManager instance;

private HashMap<Integer, User> usersById = new HashMap<Integer, User>();

private HashMap<String, User> usersByAccountName = new HashMap<String, User>();

private HashMap<Integer, User> onlineUsers = new HashMap<Integer, User>();

public static UserManager getInstance() {

if (instance == null) {

instance = new UserManager();

}

return instance;

}

public void addUser(User fromUser, String toAccountName) {

User toUser = usersByAccountName.get(toAccountName);

AddRequest req = new AddRequest(fromUser, toUser, new Date());

toUser.receivedAddRequest(req);

fromUser.sentAddRequest(req);

}

public void approveAddRequest(AddRequest req) {

req.status = RequestStatus.Accepted;

User from = req.getFromUser();

User to = req.getToUser();

from.addContact(to);

to.addContact(from);

}

public void rejectAddRequest(AddRequest req) {

req.status = RequestStatus.Rejected;

User from = req.getFromUser();

User to = req.getToUser();

from.removeAddRequest(req);

to.removeAddRequest(req);

}

public void userSignedOn(String accountName) {

User user = usersByAccountName.get(accountName);

if (user != null) {

user.setStatus(new UserStatus(UserStatusType.Available, ""));

onlineUsers.put(user.getId(), user);

}

}

public void userSignedOff(String accountName) {

User user = usersByAccountName.get(accountName);

if (user != null) {

user.setStatus(new UserStatus(UserStatusType.Offline, ""));

onlineUsers.remove(user.getId());

}

}

}