/*
 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.oracle.truffle.api.dsl.test;

import java.lang.reflect.*;

import org.junit.*;

import com.oracle.truffle.api.dsl.*;
import com.oracle.truffle.api.dsl.test.LazyClassLoadingTestFactory.TestNodeFactory;
import com.oracle.truffle.api.dsl.test.TypeSystemTest.ValueNode;

public class LazyClassLoadingTest {
    @Test
    public void test() {
        String testClassName = getClass().getName();
        String factoryClassName = testClassName + "Factory";
        String nodeFactoryClassName = factoryClassName + "$TestNodeFactory";

        Assert.assertFalse(isLoaded(factoryClassName + "$TestNode"));
        Assert.assertFalse(isLoaded(nodeFactoryClassName));

        NodeFactory<TestNode> factory = TestNodeFactory.getInstance();

        Assert.assertTrue(isLoaded(nodeFactoryClassName));
        Assert.assertFalse(isLoaded(nodeFactoryClassName + "$TestBaseNode"));

        TestHelper.createRoot(factory);

        Assert.assertTrue(isLoaded(nodeFactoryClassName + "$TestBaseNode"));
        Assert.assertTrue(isLoaded(nodeFactoryClassName + "$TestUninitializedNode"));
        Assert.assertFalse(isLoaded(nodeFactoryClassName + "$TestGenericNode"));
    }

    private boolean isLoaded(String className) {
        ClassLoader classLoader = getClass().getClassLoader();
        Method m;
        try {
            m = ClassLoader.class.getDeclaredMethod("findLoadedClass", String.class);
            m.setAccessible(true);
            return m.invoke(classLoader, className) != null;
        } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
            throw new RuntimeException(e);
        }
    }

    @SuppressWarnings("unused")
    @NodeChildren({@NodeChild("left"), @NodeChild("right")})
    abstract static class TestNode extends ValueNode {
        @Specialization(order = 1)
        int add(int left, int right) {
            return 42;
        }

        @Specialization(order = 2)
        int add(boolean left, boolean right) {
            return 21;
        }

        @Specialization(order = 4)
        String add(boolean left, int right) {
            return "(boolean,int)";
        }
    }
}