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/*
 * Copyright (c) 2017, 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
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package com.oracle.truffle.api.test.polyglot;

import static org.junit.Assert.assertSame;

import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Function;

import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.TruffleLanguage;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.test.polyglot.LanguageSPITestLanguage.LanguageContext;

@TruffleLanguage.Registration(id = LanguageSPITestLanguage.ID, name = LanguageSPITestLanguage.ID, version = "1.0", mimeType = LanguageSPITestLanguage.ID)
public class LanguageSPITestLanguage extends TruffleLanguage {

    static final String ID = "LanguageSPITest";

    static Function runinside;

    static final AtomicInteger instanceCount = new AtomicInteger();

    static class LanguageContext {

        int disposeCalled;
        Env env;
        Map config;

    }

    public LanguageSPITestLanguage() {
        instanceCount.incrementAndGet();
    }

    public static LanguageContext getContext() {
        return getCurrentContext(LanguageSPITestLanguage.class);
    }

    @Override
    protected boolean isThreadAccessAllowed(Thread thread, boolean singleThreaded) {
        return true;
    }

    @Override
    protected CallTarget parse(ParsingRequest request) throws Exception {
        getContext(); // We must have the context here
        Object result = "null result";
        if (runinside != null) {
            try {
                result = runinside.apply(getContext().env);
            } finally {
                runinside = null;
            }
        }
        if (result == null) {
            result = "null result";
        }
        return Truffle.getRuntime().createCallTarget(RootNode.createConstantNode(result));
    }

    @Override
    protected LanguageContext createContext(Env env) {
        LanguageSPITest.langContext = new LanguageContext();
        LanguageSPITest.langContext.env = env;
        LanguageSPITest.langContext.config = env.getConfig();
        return LanguageSPITest.langContext;
    }

    @Override
    protected void disposeContext(LanguageContext context) {
        assertSame(getContext(), context);
        assertSame(context, getContextReference().get());

        assertSame(context, new RootNode(this) {
            @Override
            public Object execute(VirtualFrame frame) {
                return null;
            }
        }.getLanguage(LanguageSPITestLanguage.class).getContextReference().get());

        context.disposeCalled++;
    }

    @Override
    protected Object getLanguageGlobal(LanguageContext context) {
        return null;
    }

    @Override
    protected boolean isObjectOfLanguage(Object object) {
        return false;
    }

}