JournalApp.java

import java.util.*;

public class JournalApp {
    private static final String STORAGE_FILE = "journal.txt";

    public static void main(String[] args) {
        JournalStorage storage = new JournalStorage(STORAGE_FILE);
        List<JournalEntry> entries = storage.loadEntries();
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("\nJournal App");
            System.out.println("1. Add entry");
            System.out.println("2. List entries");
            System.out.println("3. View entry");
            System.out.println("4. Edit entry");
            System.out.println("5. Delete entry");
            System.out.println("6. Exit");
            System.out.print("Choose an option: ");
            String choice = scanner.nextLine().trim();

            switch (choice) {
                case "1" -> addEntry(scanner, storage, entries);
                case "2" -> listEntries(entries);
                case "3" -> viewEntry(scanner, entries);
                case "4" -> editEntry(scanner, storage, entries);
                case "5" -> deleteEntry(scanner, storage, entries);
                case "6" -> {
                    System.out.println("Goodbye!");
                    return;
                }
                default -> System.out.println("Invalid option.");
            }
        }
    }

    private static void addEntry(Scanner scanner, JournalStorage storage, List<JournalEntry> entries) {
        System.out.print("Title: ");
        String title = scanner.nextLine().trim();
        System.out.print("Content: ");
        String content = scanner.nextLine().trim();
        JournalEntry entry = storage.createEntry(entries, title, content);
        System.out.println("Created entry " + entry.getId());
    }

    private static void listEntries(List<JournalEntry> entries) {
        if (entries.isEmpty()) {
            System.out.println("No entries yet.");
            return;
        }
        entries.forEach(System.out::println);
    }

    private static void viewEntry(Scanner scanner, List<JournalEntry> entries) {
        JournalEntry entry = findEntry(scanner, entries);
        if (entry != null) {
            System.out.println("\n" + entry);
            System.out.println("Content:");
            System.out.println(entry.getContent());
        }
    }

    private static void editEntry(Scanner scanner, JournalStorage storage, List<JournalEntry> entries) {
        JournalEntry entry = findEntry(scanner, entries);
        if (entry == null) return;
        System.out.print("New title (leave blank to keep): ");
        String title = scanner.nextLine().trim();
        System.out.print("New content (leave blank to keep): ");
        String content = scanner.nextLine().trim();
        if (!title.isEmpty()) entry.setTitle(title);
        if (!content.isEmpty()) entry.setContent(content);
        storage.saveEntries(entries);
        System.out.println("Updated entry " + entry.getId());
    }

    private static void deleteEntry(Scanner scanner, JournalStorage storage, List<JournalEntry> entries) {
        JournalEntry entry = findEntry(scanner, entries);
        if (entry == null) return;
        entries.remove(entry);
        storage.saveEntries(entries);
        System.out.println("Deleted entry " + entry.getId());
    }

    private static JournalEntry findEntry(Scanner scanner, List<JournalEntry> entries) {
        if (entries.isEmpty()) {
            System.out.println("No entries available.");
            return null;
        }
        System.out.print("Entry ID: ");
        try {
            int id = Integer.parseInt(scanner.nextLine().trim());
            return entries.stream().filter(e -> e.getId() == id).findFirst().orElseGet(() -> {
                System.out.println("Entry not found.");
                return null;
            });
        } catch (NumberFormatException e) {
            System.out.println("Invalid ID.");
            return null;
        }
    }
}