package flyweight;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

/**
 * Flyweight Design Pattern — Runnable Demo
 *
 * Creates 1000 trees of only 3 species. Without Flyweight: 1000 TreeType
 * objects. With Flyweight: 3 TreeType objects (one per species), shared.
 *
 * Run: javac flyweight/*.java && java flyweight.Main
 * Article: https://ankurm.com/flyweight-design-pattern-java/
 */
public class Main {

    public static void main(String[] args) {
        System.out.println("=== Flyweight Design Pattern Demo ===\n");

        List<Tree> forest = new ArrayList<>();
        Random rnd = new Random(42);

        String[][] treeSpecs = {
            {"Oak",  "dark-green", "rough-bark"},
            {"Pine", "blue-green", "needle-texture"},
            {"Birch","light-green","smooth-white-bark"}
        };

        System.out.println("Creating 1,000 trees (only 3 TreeType objects should be created):");
        for (int i = 0; i < 1000; i++) {
            String[] spec = treeSpecs[i % 3];
            TreeType type = TreeFactory.getTreeType(spec[0], spec[1], spec[2]);
            forest.add(new Tree(rnd.nextInt(800), rnd.nextInt(600), type));
        }

        System.out.println("\nForest created. Drawing first 5 trees:");
        for (int i = 0; i < 5; i++) {
            forest.get(i).draw();
        }

        System.out.println("\n--- Memory summary ---");
        System.out.println("Trees in forest    : " + forest.size());
        System.out.println("Unique TreeType objects in pool: " + TreeFactory.getPoolSize());
        System.out.println("Without Flyweight  : 1,000 TreeType objects");
        System.out.println("With Flyweight     : " + TreeFactory.getPoolSize() + " TreeType objects shared");

        System.out.println("\n=== Demo complete ===");
    }
}