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package net.jqwik.engine.discovery.predicates;

import java.lang.reflect.*;
import java.util.function.*;

import org.junit.platform.commons.support.*;

public class IsTestContainer implements Predicate> {

	private static final Predicate isProperty = new IsProperty();

	private static final Predicate> isPotentialTestContainer = new IsPotentialTestContainer();
	private static final Predicate> isGroup = new IsContainerAGroup();

	@Override
	public boolean test(Class candidate) {
		if (!isPotentialTestContainer.test(candidate)) {
			return false;
		}
		return hasTests(candidate) || hasGroups(candidate);
	}

	private boolean hasTests(Class candidate) {
		return !ReflectionSupport.findMethods(candidate, isProperty, HierarchyTraversalMode.TOP_DOWN).isEmpty();
	}

	private boolean hasGroups(Class candidate) {
		return !ReflectionSupport.findNestedClasses(candidate, isGroup).isEmpty();
	}

}