package memento;

/**
 * Memento Design Pattern — Runnable Demo
 * Run: javac memento/*.java -d out/memento && java -cp out/memento memento.Main
 * Article: https://ankurm.com/memento-design-pattern-java/
 */
public class Main {
    public static void main(String[] args) {
        System.out.println("=== Memento Design Pattern Demo ===\n");

        Editor editor = new Editor();
        History history = new History();

        System.out.println("Initial: " + editor);

        editor.type("Hello");
        history.save(editor.save());
        System.out.println("After type: " + editor);

        editor.type(", World");
        history.save(editor.save());
        System.out.println("After type: " + editor);

        editor.type("! How are you?");
        System.out.println("After type: " + editor);

        System.out.println("\n-- Undo --");
        editor.restore(history.undo());
        System.out.println("After undo: " + editor);

        editor.restore(history.undo());
        System.out.println("After undo: " + editor);

        System.out.println("\nHistory empty: " + (history.size() == 0));
        System.out.println("\n=== Demo complete ===");
    }
}