User.java

package com.bankApp;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.*;

public class User {

    private String username;         // используется и как имя, и как логин
    private String hashPassword;
    private double balance;
    private int moons;
    private Role role;

    private String atUser;
    private String avatar;
    private String description;
    private String status;
    private String gender;
    private String email;

    private final Set<User> friends = new HashSet<>();
    private final List<Gift> receivedGifts = new ArrayList<>();
    private final List<Post> posts = new ArrayList<>();
    private final List<PetPair> petPairs = new ArrayList<>();

    public User(String username, String password, Role role) {
        this.username = username;
        this.hashPassword = hash(password);
        this.role = role;
        this.atUser = "@" + username;
        this.balance = 0;
        this.moons = 0;
    }

    public User(String username, String hashPassword, double balance, int moons, Role role, boolean alreadyHashed) {
        this.username = username;
        this.hashPassword = alreadyHashed ? hashPassword : hash(hashPassword);
        this.role = role;
        this.atUser = "@" + username;
        this.balance = balance;
        this.moons = moons;
    }

    public static String hash(String password) {
        try {
            MessageDigest md = MessageDigest.getInstance("SHA-256");
            byte[] bytes = md.digest(password.getBytes());
            StringBuilder sb = new StringBuilder();
            for (byte b : bytes) sb.append(String.format("%02x", b));
            return sb.toString();
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
    }

    public boolean checkPassword(String password) {
        return hash(password).equals(this.hashPassword);
    }

    // ---------------- Банковские методы ----------------
    public boolean deposit(double amount) {
        if (amount <= 0) return false;
        balance += amount;
        return true;
    }

    public boolean withdraw(double amount) {
        if (amount <= 0 || amount > balance) return false;
        balance -= amount;
        return true;
    }

    public boolean transfer(User to, double amount) {
        if (to == null || amount <= 0 || this == to || balance < amount) return false;
        if (!withdraw(amount)) return false;
        return to.deposit(amount);
    }

    public int getMoons() { return moons; }
    public void addMoons(int amount) { if(amount>0) moons+=amount; }
    public boolean removeMoons(int amount) { if(amount>0 && moons>=amount){moons-=amount; return true;} return false; }

    // ---------------- Социальные методы ----------------
    public boolean addFriend(User friend) { return friend != null && friend != this && friends.add(friend); }
    public boolean removeFriend(User friend) { return friends.remove(friend); }
    public Set<User> getFriends() { return Collections.unmodifiableSet(friends); }
    public User findFriendByAtUser(String atUser) {
        for(User f : friends) if(f.getAtUser().equalsIgnoreCase(atUser)) return f;
        return null;
    }

    public void receiveGift(Gift gift) { if(gift!=null) receivedGifts.add(gift); }
    public List<Gift> getGifts() { return Collections.unmodifiableList(receivedGifts); }
    public List<Gift> getGiftsBySender(String sender) {
        List<Gift> result = new ArrayList<>();
        for(Gift g : receivedGifts) if(g.getFrom()!=null && g.getFrom().equalsIgnoreCase(sender)) result.add(g);
        return result;
    }

    public void addPost(Post post) { if(post!=null) posts.add(post); }
    public List<Post> getPosts() { return Collections.unmodifiableList(posts); }

    public void addPetPair(PetPair pair) { if(pair!=null) petPairs.add(pair); }
    public List<PetPair> getPetPairs() { return Collections.unmodifiableList(petPairs); }

    // ---------------- Геттеры и сеттеры ----------------
    public String getUsername() { return username; }
    public String getAtUser() { return atUser; }
    public void setAtUser(String atUser) { if(atUser!=null && !atUser.isEmpty()) this.atUser = atUser; }

    public String getAvatar() { return avatar; }
    public void setAvatar(String avatar) { this.avatar = avatar; }

    public String getDescription() { return description; }
    public void setDescription(String description) { this.description = description; }

    public String getStatus() { return status; }
    public void setStatus(String status) { this.status = status; }

    public String getGender() { return gender; }
    public void setGender(String gender) { this.gender = gender; }

    public String getEmail() { return email; }
    public void setEmail(String email) { if(email!=null && !email.isEmpty()) this.email=email; }

    public double getBalance() { return balance; }
    public Role getRole() { return role; }
    public String getHashPassword() { return hashPassword; }
}