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/*
 * Copyright (c) 2012, 2016, 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.test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.fail;

import org.junit.Before;
import org.junit.Test;

import com.oracle.truffle.api.RootCallTarget;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.TruffleRuntime;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.source.SourceSection;

/**
 * Accessing the Truffle Runtime
 *
 * 
 * The Truffle runtime can be accessed at any point in time globally using the static method
 * {@link Truffle#getRuntime()}. This method is guaranteed to return a non-null Truffle runtime
 * object with an identifying name. A Java Virtual Machine implementation can chose to replace the
 * default implementation of the {@link TruffleRuntime} interface with its own implementation for
 * providing improved performance.
 * 
 *
 * 
 * The next part of the Truffle API introduction is at
 * {@link com.oracle.truffle.api.test.RootNodeTest}.
 * 
 */
public class TruffleRuntimeTest {

    private TruffleRuntime runtime;

    @Before
    public void before() {
        this.runtime = Truffle.getRuntime();
    }

    private static RootNode createTestRootNode(SourceSection sourceSection) {
        return new RootNode(null) {
            @Override
            public Object execute(VirtualFrame frame) {
                return 42;
            }

            @Override
            public SourceSection getSourceSection() {
                return sourceSection;
            }
        };
    }

    // @Test
    public void verifyTheRealRuntimeIsUsedOnRealGraal() {
        TruffleRuntime r = Truffle.getRuntime();
        final String name = r.getClass().getName();
        if (name.endsWith("DefaultTruffleRuntime")) {
            fail("Wrong name " + name + " with following System.getProperties:\n" + System.getProperties().toString());
        }
    }

    @Test
    public void test() {
        assertNotNull(runtime);
        assertNotNull(runtime.getName());
    }

    @Test
    public void testCreateCallTarget() {
        RootNode rootNode = createTestRootNode(null);
        RootCallTarget target = runtime.createCallTarget(rootNode);
        assertNotNull(target);
        assertEquals(target.call(), 42);
        assertSame(rootNode, target.getRootNode());
    }

}