package composite;
public class Main {
    public static void main(String[] args) {
        System.out.println("=== Composite Design Pattern Demo ===\n");
        // Build the tree — mix files and directories freely
        Directory root = new Directory("project");
        Directory src = new Directory("src");
        Directory main = new Directory("main");
        main.add(new File("App.java",         4_200))
            .add(new File("Config.java",      1_800))
            .add(new File("Application.yml",  3_100));
        Directory test = new Directory("test");
        test.add(new File("AppTest.java",    2_600))
            .add(new File("ConfigTest.java", 1_200));
        src.add(main).add(test);
        Directory resources = new Directory("resources");
        resources.add(new File("application.yml", 1_500))
                 .add(new File("logback.xml",       900))
                 .add(new File("banner.txt",         200));
        root.add(src)
            .add(resources)
            .add(new File("pom.xml",   8_400))
            .add(new File("README.md", 2_100));
        // Print the entire tree — recursion is automatic
        System.out.println("File system tree:");
        root.print("");
        System.out.printf("%nTotal project size: %,d bytes%n", root.getSize());
        // The key demonstration: File and Directory through the same interface
        System.out.println("\n-- Treating File and Directory uniformly --");
        FileSystemItem[] items = { new File("standalone.txt", 500), src };
        for (FileSystemItem item : items) {
            System.out.printf("%s -> size: %,d bytes%n", item.getName(), item.getSize());
        }
        System.out.println("\n=== Demo complete ===");
    }
}