import java.io.*;
import java.util.*;

// Classe interne, non publique
class Task implements Serializable {
    private static final long serialVersionUID = 1L;
    private String description;
    private boolean done;

    public Task(String description) {
        this.description = description;
        this.done = false;
    }

    public void markDone() {
        this.done = true;
    }

    public boolean isDone() {
        return done;
    }

    public String getDescription() {
        return description;
    }

    @Override
    public String toString() {
        return (done ? "[X] " : "[ ] ") + description;
    }
}

// Classe principale, publique
public class TaskManager {
    private static final String FILE_NAME = "tasks.dat";
    private List<Task> tasks;

    public TaskManager() {
        tasks = loadTasks();
    }

    public void addTask(String description) {
        tasks.add(new Task(description));
        saveTasks();
    }

    public void listTasks() {
        if (tasks.isEmpty()) {
            System.out.println("Aucune tâche.");
            return;
        }
        for (int i = 0; i < tasks.size(); i++) {
            System.out.println((i + 1) + ". " + tasks.get(i));
        }
    }

    public void markTaskDone(int index) {
        if (index >= 1 && index <= tasks.size()) {
            tasks.get(index - 1).markDone();
            saveTasks();
        } else {
            System.out.println("Index invalide.");
        }
    }

    public void deleteTask(int index) {
        if (index >= 1 && index <= tasks.size()) {
            tasks.remove(index - 1);
            saveTasks();
        } else {
            System.out.println("Index invalide.");
        }
    }

    private void saveTasks() {
        try (ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(FILE_NAME))) {
            out.writeObject(tasks);
        } catch (IOException e) {
            System.out.println("Erreur lors de la sauvegarde des tâches.");
        }
    }
    @SuppressWarnings("unchecked")
    private List<Task> loadTasks() {
        try (ObjectInputStream in = new ObjectInputStream(new FileInputStream(FILE_NAME))) {
            return (List<Task>) in.readObject();
        } catch (IOException | ClassNotFoundException e) {
            return new ArrayList<>();
        }
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        TaskManager manager = new TaskManager();

        System.out.println("=== Gestionnaire de Tâches ===");

        while (true) {
            System.out.println("\n1. Ajouter une tâche");
            System.out.println("2. Marquer une tâche comme terminée");
            System.out.println("3. Supprimer une tâche");
            System.out.println("4. Lister les tâches");
            System.out.println("5. Quitter");
            System.out.print("Choix: ");
            String choice = scanner.nextLine();

            switch (choice) {
                case "1":
                    System.out.print("Description de la tâche: ");
                    String desc = scanner.nextLine();
                    manager.addTask(desc);
                    break;
                case "2":
                    manager.listTasks();
                    System.out.print("Numéro de la tâche à marquer comme terminée: ");
                    manager.markTaskDone(Integer.parseInt(scanner.nextLine()));
                    break;
                case "3":
                    manager.listTasks();
                    System.out.print("Numéro de la tâche à supprimer: ");
                    manager.deleteTask(Integer.parseInt(scanner.nextLine()));
                    break;
                case "4":
                    manager.listTasks();
                    break;
                case "5":
                    System.out.println("Au revoir !");
                    return;
                default:
                    System.out.println("Choix invalide.");
            }
        }
    }
}