import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class FacebookUser extends UserAccount implements Serializable {
	private static final long serialVersionUID = 42L;
	private String passwordHint;
	private ArrayList<FacebookUser> friends;

	public FacebookUser(String username, String password) {
		super(username, password);
		friends = new ArrayList<FacebookUser>();
	}

	@Override
	public void getPasswordHelp() {
		System.out.println("Password Hint: " + passwordHint);
	}

	public void getPasswordHelp(String username) {
		if (friends.size() == 0) {
			System.out.println("There is no user with that username.");
		} else {
			for (int i = 0; i < friends.size(); i++) {
				if (friends.get(i).toString().equals(username)) {
					friends.get(i).getPasswordHelp();
					break;
				}
				if (i == friends.size() - 1) {
					System.out.println("There is no user with that username.");
					break;
				}
			}
		}
	}

	void setPasswordHint(String hint) {
		passwordHint = hint;
	}

	void friend(String username1, String password) {
		Scanner s = new Scanner(System.in);
		String username2;
		if (friends.size() == 0) {
			System.out.println("That user does not exist.");
		} else {
			mainloop:
			for (int i = 0; i < friends.size(); i++) {
				if (friends.get(i).toString().equals(username1)) {
					if (friends.get(i).getPassword().equals(password)) {
						System.out.println("Username of user to add: ");
						username2 = s.nextLine();
						if (username2.equals(friends.get(i).toString())) {
							System.out.println("Users cannot add themsleves as their own friend.");
							break;
						}
						for (int j = 0; j < friends.size(); j++) {
							if (username2.equals(friends.get(j).toString())) {
								friends.get(i).friend(friends.get(j));
								break mainloop;
							}
							if (!username2.equals(friends.get(j).toString()) && j == friends.size() - 1) {
								System.out.println("That user does not exist.");
								break mainloop;
							}
						}
					} else {
						System.out.println("Incorrect Password");
						break;
					}
				} else if (!friends.get(i).toString().equals(username1) && i == friends.size() - 1) {
					System.out.println("That user does not exist.");
				}
			}
		}
	}

	void defriend(String username1, String password) {
		Scanner s = new Scanner(System.in);
		String username2;
		if (friends.size() == 0) {
			System.out.println("That user does not exist.");
		} else {
			mainloop:
			for (int i = 0; i < friends.size(); i++) {
				if (friends.get(i).toString().equals(username1)) {
					if (friends.get(i).getPassword().equals(password)) {
						System.out.println("Username of user to defriend: ");
						username2 = s.nextLine();
						if (friends.get(i).friends.size() == 0) {
							System.out.println("That person's friends list is empty.");
							break;
						} else {
							for (int j = 0; j < friends.get(i).friends.size(); j++) {
								if (friends.get(i).friends.get(j).toString().equals(username2)) {
									friends.get(i).friends.remove(j);
									break mainloop;
								} else if (!friends.get(i).friends.get(j).toString().equals(username2) && j == friends.get(i).friends.size() - 1) {
									System.out.println("That person is not in the users friends list");
									break mainloop;
								}
							}
						}
					} else {
						System.out.println("Incorrect Password");
						break;
					}
				} else if (!friends.get(i).toString().equals(username1) && i == friends.size() - 1) {
					System.out.println("That user does not exist.");
				}
			}
		}
	}

	void listFriends(String username1, String password) {
		if (friends.size() == 0) {
			System.out.println("That user does not exist.");
		} else {
			for (int i = 0; i < friends.size(); i++) {
				if (friends.get(i).toString().equals(username1)) {
					if (friends.get(i).getPassword().equals(password)) {
						System.out.println(friends.get(i).getFriends());
						break;
					} else {
						System.out.println("Incorrect Password");
						break;
					}
				} else if (!friends.get(i).toString().equals(username1) && i == friends.size() - 1) {
					System.out.println("That user does not exist.");
				}
			}
		}
	}

	private void friend(FacebookUser facebookUser) {
		friends.add(facebookUser);
	}

	void friend(String username) {
		Scanner s = new Scanner(System.in);
		if (friends.size() == 0) {
			System.out.println("Please create a password: ");
			String password = s.nextLine();
			System.out.println("Please create a password hint: ");
			String passHint = s.nextLine();
			FacebookUser fbu = new FacebookUser(username, password);
			fbu.setPasswordHint(passHint);
			friends.add(fbu);
		} else {
			for (int i = 0; i < friends.size(); i++) {
				if (friends.get(i).toString().equals(username)) {
					System.out.println("That person is already your friend.");
					break;
				}
				if (i == friends.size() - 1) {
					System.out.println("Please create a password: ");
					String password = s.nextLine();
					System.out.println("Please create a password hint: ");
					String passHint = s.nextLine();
					FacebookUser fbu = new FacebookUser(username, password);
					fbu.setPasswordHint(passHint);
					friends.add(fbu);
					break;
				}
			}
		}
	}

	void defriend(FacebookUser formerFriend) {
		if (friends.contains(formerFriend)) {
			friends.remove(formerFriend);
		} else {
			System.out.println("That person is not your friend.");
		}

	}

	void defriend(String username) {
		Scanner s = new Scanner(System.in);
		if (friends.size() == 0) {
			System.out.println("That person is not your friend.");
		} else {
			for (int i = 0; i < friends.size(); i++) {
				if (friends.get(i).toString().equals(username)) {
					System.out.println("Password for " + username + ": ");
					String passw = s.nextLine();
					if (friends.get(i).getPassword().equals(passw)) {
						friends.remove(i);
						break;
					} else {
						System.out.println("Incorrect Password");
						break;
					}
				}
				if (i == friends.size() - 1) {
					System.out.println("That person is not your friend.");
					break;
				}
			}
		}
	}

	ArrayList<FacebookUser> getRecommendations(String username) {
		ArrayList<FacebookUser> recoFriends = new ArrayList<FacebookUser>();
		Set<FacebookUser> set = new HashSet<FacebookUser>();
		if (friends.size() == 0) {
			System.out.println("That user does not exist.");
		} else {
			for (int i = 0; i < friends.size(); i++) {
				if (friends.get(i).toString().equals(username)) {
					if (friends.get(i).friends.size() == 0) {
						System.out.println("That user has no friends to use to find recommendations.");
						break;
					}
					recoFriends.addAll(friends.get(i).friends);
					for (int j = 0; j < friends.get(i).friends.size(); j++) {
						if (recoFriends.size() > 1) {
							set.addAll(recoFriends);
							recoFriends.clear();
							recoFriends.addAll(set);
						}
						friends.get(i).friends.get(j).friend(friends.get(i).friends.get(j));
						recoFriends.addAll(friends.get(i).friends.get(j).getRecommendations(friends.get(i).friends.get(j).toString()));

					}
				}
				if (!friends.get(i).toString().equals(username) && i == friends.size() - 1) {
					System.out.println("That user does not exist..");
					break;
				}
			}
		}


		return recoFriends;
	}

	ArrayList<FacebookUser> getFriends() {
		ArrayList<FacebookUser> friendsCopy = new ArrayList<FacebookUser>();
		for (int i = 0; i < friends.size(); i++) {
			friendsCopy.add(friends.get(i));
		}
		Collections.sort(friendsCopy, new Comparator<FacebookUser>() {
			@Override
			public int compare(FacebookUser fb1, FacebookUser fb2) {
				return fb1.toString().compareToIgnoreCase(fb2.toString());
			}
		});
		return friendsCopy;
	}

	public static void writeToFile(FacebookUser facebookUser) throws IOException {
		ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("FacebookUser.bin"));
		oos.writeObject(facebookUser); // This saves the data.
	}

	public static FacebookUser readFile() throws IOException, ClassNotFoundException {
		ObjectInputStream ois = new ObjectInputStream(new FileInputStream("FacebookUser.bin"));
		FacebookUser facebookUser = (FacebookUser) ois.readObject();
		return facebookUser;
	}

}