/*
 * Copyright (c) 2015, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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.interop.java.test;

import com.oracle.truffle.api.interop.Message;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.interop.java.JavaInterop;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import org.junit.Before;
import org.junit.Test;

public class ClassInteropTest {
    private TruffleObject obj;
    private XYPlus xyp;

    public static int x;
    public static double y;
    public static final int CONST = 42;
    public int value = CONST;

    public static double plus(double a, double b) {
        return a + b;
    }

    @Before
    public void initObjects() {
        obj = JavaInterop.asTruffleObject(ClassInteropTest.class);
        xyp = JavaInterop.asJavaObject(XYPlus.class, obj);
    }

    @Test
    public void doubleWrap() {
        x = 32;
        y = 10.1;
        assertEquals("Assume delegated", 42.1d, xyp.plus(xyp.x(), xyp.y()), 0.05);
    }

    @Test
    public void readCONST() {
        assertEquals("Field read", 42, xyp.CONST(), 0.01);
    }

    @Test
    public void cannotReadValueAsItIsNotStatic() {
        try {
            assertEquals("Field read", 42, xyp.value());
        } catch (NoSuchFieldError ex) {
            // OK
            return;
        }
        fail("value isn't static field");
    }

    @Test
    public void canReadValueAfterCreatingNewInstance() {
        Object objInst = JavaInteropTest.message(Message.createNew(0), obj);
        assertTrue("It is truffle object", objInst instanceof TruffleObject);
        XYPlus inst = JavaInterop.asJavaObject(XYPlus.class, (TruffleObject) objInst);
        assertEquals("Field read", 42, inst.value());
    }

    @Test(expected = NoSuchFieldError.class)
    public void noNonStaticMethods() {
        Object res = JavaInteropTest.message(Message.READ, obj, "readCONST");
        assertNull("not found", res);
    }

    public interface XYPlus {
        int x();

        double y();

        double plus(double a, double b);

        // Checkstyle: stop method name check
        int CONST();

        // Checkstyle: resume method name check

        int value();
    }
}