package flyweight;

import java.util.HashMap;
import java.util.Map;

/**
 * Flyweight Factory — the cache that ensures each unique TreeType
 * is only created once, no matter how many trees use it.
 *
 * This is the piece that makes Flyweight work:
 * it intercepts creation requests and returns an existing
 * shared instance if one already exists.
 */
public class TreeFactory {

    // The pool of shared flyweights
    private static final Map<String, TreeType> treeTypes = new HashMap<>();

    public static TreeType getTreeType(String name, String color, String texture) {
        String key = name + "_" + color + "_" + texture;

        // Only create a new TreeType if we haven't seen this combination before
        return treeTypes.computeIfAbsent(key, k -> new TreeType(name, color, texture));
    }

    public static int getPoolSize() {
        return treeTypes.size();
    }
}