/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.harmony.tests.java.nio;

import java.nio.BufferOverflowException;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.DoubleBuffer;
import java.nio.InvalidMarkException;

/**
 * Tests java.nio.DoubleBuffer
 */
public class DoubleBufferTest extends AbstractBufferTest {

    protected static final int SMALL_TEST_LENGTH = 5;

    protected static final int BUFFER_LENGTH = 20;

    protected DoubleBuffer buf;

    protected void setUp() throws Exception {
        buf = DoubleBuffer.allocate(BUFFER_LENGTH);
        loadTestData1(buf);
        baseBuf = buf;
    }

    protected void tearDown() throws Exception {
        buf = null;
        baseBuf = null;
    }

    /*
     * Test with bit sequences that represent the IEEE754 doubles Positive
     * infinity, negative infinity, and NaN.
     */
    public void testNaNs() {
        long[] nans = new long[] { 0x7ff0000000000000L, 0xfff0000000000000L,
                0x7ff8000000000000L };
        for (int i = 0; i < nans.length; i++) {
            long longBitsIn = nans[i];
            double dbl = Double.longBitsToDouble(longBitsIn);
            long longBitsOut = Double.doubleToRawLongBits(dbl);
            // Sanity check
            assertTrue(longBitsIn == longBitsOut);

            // Store the double and retrieve it
            ByteBuffer buffer = ByteBuffer.allocate(8);
            buffer.putDouble(dbl);
            double bufDoubleOut = buffer.getDouble(0);

            // Check the bits sequence was not normalized
            long bufLongOut = Double.doubleToRawLongBits(bufDoubleOut);
            assertTrue(longBitsIn == bufLongOut);
        }
    }

    public void testArray() {
        double array[] = buf.array();
        assertContentEquals(buf, array, buf.arrayOffset(), buf.capacity());

        loadTestData1(array, buf.arrayOffset(), buf.capacity());
        assertContentEquals(buf, array, buf.arrayOffset(), buf.capacity());

        loadTestData2(array, buf.arrayOffset(), buf.capacity());
        assertContentEquals(buf, array, buf.arrayOffset(), buf.capacity());

        loadTestData1(buf);
        assertContentEquals(buf, array, buf.arrayOffset(), buf.capacity());

        loadTestData2(buf);
        assertContentEquals(buf, array, buf.arrayOffset(), buf.capacity());
    }

    public void testArrayOffset() {
        double array[] = buf.array();
        assertContentEquals(buf, array, buf.arrayOffset(), buf.capacity());

        loadTestData1(array, buf.arrayOffset(), buf.capacity());
        assertContentEquals(buf, array, buf.arrayOffset(), buf.capacity());

        loadTestData2(array, buf.arrayOffset(), buf.capacity());
        assertContentEquals(buf, array, buf.arrayOffset(), buf.capacity());

        loadTestData1(buf);
        assertContentEquals(buf, array, buf.arrayOffset(), buf.capacity());

        loadTestData2(buf);
        assertContentEquals(buf, array, buf.arrayOffset(), buf.capacity());
    }

    public void testAsReadOnlyBuffer() {
        buf.clear();
        buf.mark();
        buf.position(buf.limit());

        // readonly's contents should be the same as buf
        DoubleBuffer readonly = buf.asReadOnlyBuffer();
        assertNotSame(buf, readonly);
        assertTrue(readonly.isReadOnly());
        assertEquals(buf.position(), readonly.position());
        assertEquals(buf.limit(), readonly.limit());
        assertEquals(buf.isDirect(), readonly.isDirect());
        assertEquals(buf.order(), readonly.order());
        assertContentEquals(buf, readonly);

        // readonly's position, mark, and limit should be independent to buf
        readonly.reset();
        assertEquals(readonly.position(), 0);
        readonly.clear();
        assertEquals(buf.position(), buf.limit());
        buf.reset();
        assertEquals(buf.position(), 0);
    }

    public void testCompact() {
        // case: buffer is full
        buf.clear();
        buf.mark();
        loadTestData1(buf);
        DoubleBuffer ret = buf.compact();
        assertSame(ret, buf);
        assertEquals(buf.position(), buf.capacity());
        assertEquals(buf.limit(), buf.capacity());
        assertContentLikeTestData1(buf, 0, 0.0, buf.capacity());
        try {
            buf.reset();
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (InvalidMarkException e) {
            // expected
        }

        // case: buffer is empty
        buf.position(0);
        buf.limit(0);
        buf.mark();
        ret = buf.compact();
        assertSame(ret, buf);
        assertEquals(buf.position(), 0);
        assertEquals(buf.limit(), buf.capacity());
        assertContentLikeTestData1(buf, 0, 0.0, buf.capacity());
        try {
            buf.reset();
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (InvalidMarkException e) {
            // expected
        }

        // case: normal
        assertTrue(buf.capacity() > 5);
        buf.position(1);
        buf.limit(5);
        buf.mark();
        ret = buf.compact();
        assertSame(ret, buf);
        assertEquals(buf.position(), 4);
        assertEquals(buf.limit(), buf.capacity());
        assertContentLikeTestData1(buf, 0, 1.0, 4);
        try {
            buf.reset();
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (InvalidMarkException e) {
            // expected
        }
    }

    public void testCompareTo() {
        DoubleBuffer other = DoubleBuffer.allocate(buf.capacity());
        loadTestData1(other);
        assertEquals(0, buf.compareTo(other));
        assertEquals(0, other.compareTo(buf));
        buf.position(1);
        assertTrue(buf.compareTo(other) > 0);
        assertTrue(other.compareTo(buf) < 0);
        other.position(2);
        assertTrue(buf.compareTo(other) < 0);
        assertTrue(other.compareTo(buf) > 0);
        buf.position(2);
        other.limit(5);
        assertTrue(buf.compareTo(other) > 0);
        assertTrue(other.compareTo(buf) < 0);

        DoubleBuffer dbuffer1 = DoubleBuffer.wrap(new double[] { Double.NaN });
        DoubleBuffer dbuffer2 = DoubleBuffer.wrap(new double[] { Double.NaN });
        DoubleBuffer dbuffer3 = DoubleBuffer.wrap(new double[] { 42d });

        assertEquals("Failed equal comparison with NaN entry", 0, dbuffer1
                .compareTo(dbuffer2));
        assertEquals("Failed greater than comparison with NaN entry", -1, dbuffer3
                .compareTo(dbuffer1));
        assertEquals("Failed greater than comparison with NaN entry", 1, dbuffer1
                .compareTo(dbuffer3));
    }

    public void testCompareTo_positiveAndNegativeZero() {
        double negativeZero = Double.parseDouble("-0");
        double positiveZero = Double.parseDouble("+0");
        DoubleBuffer negativeZeroBuffer = DoubleBuffer.wrap(new double[] { negativeZero });
        DoubleBuffer positiveZeroBuffer = DoubleBuffer.wrap(new double[] { positiveZero });
        assertTrue(Double.compare(negativeZero, positiveZero) < 0); // sanity check

        // Unlike Double.compare(), DoubleBuffer.compareTo() considers -0 == +0
        assertEquals(0, negativeZeroBuffer.compareTo(positiveZeroBuffer));
    }

    public void testDuplicate() {
        buf.clear();
        buf.mark();
        buf.position(buf.limit());

        // duplicate's contents should be the same as buf
        DoubleBuffer duplicate = buf.duplicate();
        assertNotSame(buf, duplicate);
        assertEquals(buf.position(), duplicate.position());
        assertEquals(buf.limit(), duplicate.limit());
        assertEquals(buf.isReadOnly(), duplicate.isReadOnly());
        assertEquals(buf.isDirect(), duplicate.isDirect());
        assertEquals(buf.order(), duplicate.order());
        assertContentEquals(buf, duplicate);

        // duplicate's position, mark, and limit should be independent to buf
        duplicate.reset();
        assertEquals(duplicate.position(), 0);
        duplicate.clear();
        assertEquals(buf.position(), buf.limit());
        buf.reset();
        assertEquals(buf.position(), 0);

        // duplicate share the same content with buf
        // FIXME
        if (!duplicate.isReadOnly()) {
            loadTestData1(buf);
            assertContentEquals(buf, duplicate);
            loadTestData2(duplicate);
            assertContentEquals(buf, duplicate);
        }
    }

    public void testEquals() {
        // equal to self
        assertTrue(buf.equals(buf));
        DoubleBuffer readonly = buf.asReadOnlyBuffer();
        assertTrue(buf.equals(readonly));
        DoubleBuffer duplicate = buf.duplicate();
        assertTrue(buf.equals(duplicate));

        // always false, if type mismatch
        assertFalse(buf.equals(Boolean.TRUE));

        assertTrue(buf.capacity() > 5);

        buf.limit(buf.capacity()).position(0);
        readonly.limit(readonly.capacity()).position(1);
        assertFalse(buf.equals(readonly));

        buf.limit(buf.capacity() - 1).position(0);
        duplicate.limit(duplicate.capacity()).position(0);
        assertFalse(buf.equals(duplicate));
    }

    /*
     * Class under test for double get()
     */
    public void testGet() {
        buf.clear();
        for (int i = 0; i < buf.capacity(); i++) {
            assertEquals(buf.position(), i);
            assertEquals(buf.get(), buf.get(i), 0.01);
        }
        try {
            buf.get();
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (BufferUnderflowException e) {
            // expected
        }
    }

    /*
     * Class under test for java.nio.DoubleBuffer get(double[])
     */
    public void testGetdoubleArray() {
        double array[] = new double[1];
        buf.clear();
        for (int i = 0; i < buf.capacity(); i++) {
            assertEquals(buf.position(), i);
            DoubleBuffer ret = buf.get(array);
            assertEquals(array[0], buf.get(i), 0.01);
            assertSame(ret, buf);
        }
        try {
            buf.get(array);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (BufferUnderflowException e) {
            // expected
        }
    }

    /*
     * Class under test for java.nio.DoubleBuffer get(double[], int, int)
     */
    public void testGetdoubleArrayintint() {
        buf.clear();
        double array[] = new double[buf.capacity()];

        try {
            buf.get(new double[buf.capacity() + 1], 0, buf.capacity() + 1);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (BufferUnderflowException e) {
            // expected
        }
        assertEquals(buf.position(), 0);
        try {
            buf.get(array, -1, array.length);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (IndexOutOfBoundsException e) {
            // expected
        }
        buf.get(array, array.length, 0);
        try {
            buf.get(array, array.length + 1, 1);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (IndexOutOfBoundsException e) {
            // expected
        }
        assertEquals(buf.position(), 0);
        try {
            buf.get(array, 2, -1);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (IndexOutOfBoundsException e) {
            // expected
        }
        try {
            buf.get((double[])null, 0, -1);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (NullPointerException e) {
            // expected
        }
        try {
            buf.get(array, 2, array.length);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (IndexOutOfBoundsException e) {
            // expected
        }
        try {
            buf.get(array, 1, Integer.MAX_VALUE);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (BufferUnderflowException expected) {
        } catch (IndexOutOfBoundsException expected) {
        }
        try {
            buf.get(array, Integer.MAX_VALUE, 1);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (IndexOutOfBoundsException e) {
            // expected
        }
        assertEquals(buf.position(), 0);

        buf.clear();
        DoubleBuffer ret = buf.get(array, 0, array.length);
        assertEquals(buf.position(), buf.capacity());
        assertContentEquals(buf, array, 0, array.length);
        assertSame(ret, buf);
    }

    /*
     * Class under test for double get(int)
     */
    public void testGetint() {
        buf.clear();
        for (int i = 0; i < buf.capacity(); i++) {
            assertEquals(buf.position(), i);
            assertEquals(buf.get(), buf.get(i), 0.01);
        }
        try {
            buf.get(-1);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (IndexOutOfBoundsException e) {
            // expected
        }
        try {
            buf.get(buf.limit());
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (IndexOutOfBoundsException e) {
            // expected
        }
    }

    public void testHasArray() {
        assertTrue(buf.hasArray());
    }

    public void testHashCode() {
        buf.clear();
        DoubleBuffer readonly = buf.asReadOnlyBuffer();
        DoubleBuffer duplicate = buf.duplicate();
        assertTrue(buf.hashCode() == readonly.hashCode());

        assertTrue(buf.capacity() > 5);
        duplicate.position(buf.capacity() / 2);
        assertTrue(buf.hashCode() != duplicate.hashCode());
    }

    public void testIsDirect() {
        assertFalse(buf.isDirect());
    }

    public void testOrder() {
        assertEquals(ByteOrder.nativeOrder(), buf.order());
    }

    /*
     * Class under test for java.nio.DoubleBuffer put(double)
     */
    public void testPutdouble() {

        buf.clear();
        for (int i = 0; i < buf.capacity(); i++) {
            assertEquals(buf.position(), i);
            DoubleBuffer ret = buf.put((double) i);
            assertEquals(buf.get(i), (double) i, 0.0);
            assertSame(ret, buf);
        }
        try {
            buf.put(0);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (BufferOverflowException e) {
            // expected
        }
    }

    /*
     * Class under test for java.nio.DoubleBuffer put(double[])
     */
    public void testPutdoubleArray() {
        double array[] = new double[1];

        buf.clear();
        for (int i = 0; i < buf.capacity(); i++) {
            assertEquals(buf.position(), i);
            array[0] = (double) i;
            DoubleBuffer ret = buf.put(array);
            assertEquals(buf.get(i), (double) i, 0.0);
            assertSame(ret, buf);
        }
        try {
            buf.put(array);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (BufferOverflowException e) {
            // expected
        }
    }

    /*
     * Class under test for java.nio.DoubleBuffer put(double[], int, int)
     */
    public void testPutdoubleArrayintint() {
        buf.clear();
        double array[] = new double[buf.capacity()];

        try {
            buf.put(new double[buf.capacity() + 1], 0, buf.capacity() + 1);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (BufferOverflowException e) {
            // expected
        }
        assertEquals(buf.position(), 0);
        try {
            buf.put(array, -1, array.length);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (IndexOutOfBoundsException e) {
            // expected
        }
        try {
            buf.put(array, array.length + 1, 0);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (IndexOutOfBoundsException e) {
            // expected
        }
        buf.put(array, array.length, 0);
        assertEquals(buf.position(), 0);
        try {
            buf.put(array, 0, -1);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (IndexOutOfBoundsException e) {
            // expected
        }
        try {
            buf.put((double[])null, 0, -1);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (NullPointerException e) {
            // expected
        }
        try {
            buf.put(array, 2, array.length);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (IndexOutOfBoundsException e) {
            // expected
        }
        try {
            buf.put(array, Integer.MAX_VALUE, 1);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (IndexOutOfBoundsException e) {
            // expected
        }
        try {
            buf.put(array, 1, Integer.MAX_VALUE);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (BufferOverflowException expected) {
        } catch (IndexOutOfBoundsException expected) {
        }
        assertEquals(buf.position(), 0);

        loadTestData2(array, 0, array.length);
        DoubleBuffer ret = buf.put(array, 0, array.length);
        assertEquals(buf.position(), buf.capacity());
        assertContentEquals(buf, array, 0, array.length);
        assertSame(ret, buf);
    }

    /*
     * Class under test for java.nio.DoubleBuffer put(java.nio.DoubleBuffer)
     */
    public void testPutDoubleBuffer() {
        DoubleBuffer other = DoubleBuffer.allocate(buf.capacity());

        try {
            buf.put(buf);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (IllegalArgumentException e) {
            // expected
        }
        try {
            buf.put(DoubleBuffer.allocate(buf.capacity() + 1));
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (BufferOverflowException e) {
            // expected
        }

        loadTestData2(other);
        other.clear();
        buf.clear();
        DoubleBuffer ret = buf.put(other);
        assertEquals(other.position(), other.capacity());
        assertEquals(buf.position(), buf.capacity());
        assertContentEquals(other, buf);
        assertSame(ret, buf);
    }

    /*
     * Class under test for java.nio.DoubleBuffer put(int, double)
     */
    public void testPutintdouble() {
        buf.clear();
        for (int i = 0; i < buf.capacity(); i++) {
            assertEquals(buf.position(), 0);
            DoubleBuffer ret = buf.put(i, (double) i);
            assertEquals(buf.get(i), (double) i, 0.0);
            assertSame(ret, buf);
        }
        try {
            buf.put(-1, 0);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (IndexOutOfBoundsException e) {
            // expected
        }
        try {
            buf.put(buf.limit(), 0);
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (IndexOutOfBoundsException e) {
            // expected
        }
    }

    public void testSlice() {
        assertTrue(buf.capacity() > 5);
        buf.position(1);
        buf.limit(buf.capacity() - 1);

        DoubleBuffer slice = buf.slice();
        assertEquals(buf.isReadOnly(), slice.isReadOnly());
        assertEquals(buf.isDirect(), slice.isDirect());
        assertEquals(buf.order(), slice.order());
        assertEquals(slice.position(), 0);
        assertEquals(slice.limit(), buf.remaining());
        assertEquals(slice.capacity(), buf.remaining());
        try {
            slice.reset();
            fail("Should throw Exception"); //$NON-NLS-1$
        } catch (InvalidMarkException e) {
            // expected
        }

        // slice share the same content with buf
        // FIXME:
        if (!slice.isReadOnly()) {
            loadTestData1(slice);
            assertContentLikeTestData1(buf, 1, 0, slice.capacity());
            buf.put(2, 500);
            assertEquals(slice.get(1), 500, 0.0);
        }
    }

    public void testToString() {
        String str = buf.toString();
        assertTrue(str.indexOf("Double") >= 0 || str.indexOf("double") >= 0);
        assertTrue(str.indexOf("" + buf.position()) >= 0);
        assertTrue(str.indexOf("" + buf.limit()) >= 0);
        assertTrue(str.indexOf("" + buf.capacity()) >= 0);
    }

    void loadTestData1(double array[], int offset, int length) {
        for (int i = 0; i < length; i++) {
            array[offset + i] = (double) i;
        }
    }

    void loadTestData2(double array[], int offset, int length) {
        for (int i = 0; i < length; i++) {
            array[offset + i] = (double) length - i;
        }
    }

    void loadTestData1(DoubleBuffer buf) {
        buf.clear();
        for (int i = 0; i < buf.capacity(); i++) {
            buf.put(i, (double) i);
        }
    }

    void loadTestData2(DoubleBuffer buf) {
        buf.clear();
        for (int i = 0; i < buf.capacity(); i++) {
            buf.put(i, (double) buf.capacity() - i);
        }
    }

    private void assertContentEquals(DoubleBuffer buf, double array[],
            int offset, int length) {
        for (int i = 0; i < length; i++) {
            assertEquals(buf.get(i), array[offset + i], 0.01);
        }
    }

    private void assertContentEquals(DoubleBuffer buf, DoubleBuffer other) {
        assertEquals(buf.capacity(), other.capacity());
        for (int i = 0; i < buf.capacity(); i++) {
            assertEquals(buf.get(i), other.get(i), 0.01);
        }
    }

    private void assertContentLikeTestData1(DoubleBuffer buf, int startIndex,
            double startValue, int length) {
        double value = startValue;
        for (int i = 0; i < length; i++) {
            assertEquals(buf.get(startIndex + i), value, 0.01);
            value = value + 1.0;
        }
    }
}