/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed 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 com.android.inputmethod.latin;

import android.test.AndroidTestCase;

public class ResizableIntArrayTests extends AndroidTestCase {
    private static final int DEFAULT_CAPACITY = 48;

    public void testNewInstance() {
        final ResizableIntArray src = new ResizableIntArray(DEFAULT_CAPACITY);
        final int[] array = src.getPrimitiveArray();
        assertEquals("new instance length", 0, src.getLength());
        assertNotNull("new instance array", array);
        assertEquals("new instance array length", DEFAULT_CAPACITY, array.length);
    }

    public void testAdd() {
        final ResizableIntArray src = new ResizableIntArray(DEFAULT_CAPACITY);
        final int[] array = src.getPrimitiveArray();
        int[] array2 = null, array3 = null;
        final int limit = DEFAULT_CAPACITY * 2 + 10;
        for (int i = 0; i < limit; i++) {
            src.add(i);
            assertEquals("length after add " + i, i + 1, src.getLength());
            if (i == DEFAULT_CAPACITY) array2 = src.getPrimitiveArray();
            if (i == DEFAULT_CAPACITY * 2) array3 = src.getPrimitiveArray();
            if (i < DEFAULT_CAPACITY) {
                assertSame("array after add " + i, array, src.getPrimitiveArray());
            } else if (i < DEFAULT_CAPACITY * 2) {
                assertSame("array after add " + i, array2, src.getPrimitiveArray());
            } else if (i < DEFAULT_CAPACITY * 3) {
                assertSame("array after add " + i, array3, src.getPrimitiveArray());
            }
        }
        for (int i = 0; i < limit; i++) {
            assertEquals("value at " + i, i, src.get(i));
        }
    }

    public void testAddAt() {
        final ResizableIntArray src = new ResizableIntArray(DEFAULT_CAPACITY);
        final int limit = DEFAULT_CAPACITY * 10, step = DEFAULT_CAPACITY * 2;
        for (int i = 0; i < limit; i += step) {
            src.add(i, i);
            assertEquals("length after add at " + i, i + 1, src.getLength());
        }
        for (int i = 0; i < limit; i += step) {
            assertEquals("value at " + i, i, src.get(i));
        }
    }

    public void testGet() {
        final ResizableIntArray src = new ResizableIntArray(DEFAULT_CAPACITY);
        try {
            final int value = src.get(0);
            fail("get(0) shouldn't succeed");
        } catch (ArrayIndexOutOfBoundsException e) {
            // success
        }
        try {
            final int value = src.get(DEFAULT_CAPACITY);
            fail("get(DEFAULT_CAPACITY) shouldn't succeed");
        } catch (ArrayIndexOutOfBoundsException e) {
            // success
        }

        final int index = DEFAULT_CAPACITY / 2;
        src.add(index, 100);
        assertEquals("legth after add at " + index, index + 1, src.getLength());
        assertEquals("value after add at " + index, 100, src.get(index));
        assertEquals("value after add at 0", 0, src.get(0));
        try {
            final int value = src.get(src.getLength());
            fail("get(length) shouldn't succeed");
        } catch (ArrayIndexOutOfBoundsException e) {
            // success
        }
    }

    public void testReset() {
        final ResizableIntArray src = new ResizableIntArray(DEFAULT_CAPACITY);
        final int[] array = src.getPrimitiveArray();
        for (int i = 0; i < DEFAULT_CAPACITY; i++) {
            src.add(i);
            assertEquals("length after add " + i, i + 1, src.getLength());
        }

        final int smallerLength = DEFAULT_CAPACITY / 2;
        src.reset(smallerLength);
        final int[] array2 = src.getPrimitiveArray();
        assertEquals("length after reset", 0, src.getLength());
        assertNotSame("array after reset", array, array2);

        int[] array3 = null;
        for (int i = 0; i < DEFAULT_CAPACITY; i++) {
            src.add(i);
            assertEquals("length after add " + i, i + 1, src.getLength());
            if (i == smallerLength) array3 = src.getPrimitiveArray();
            if (i < smallerLength) {
                assertSame("array after add " + i, array2, src.getPrimitiveArray());
            } else if (i < smallerLength * 2) {
                assertSame("array after add " + i, array3, src.getPrimitiveArray());
            }
        }
    }

    public void testSetLength() {
        final ResizableIntArray src = new ResizableIntArray(DEFAULT_CAPACITY);
        final int[] array = src.getPrimitiveArray();
        for (int i = 0; i < DEFAULT_CAPACITY; i++) {
            src.add(i);
            assertEquals("length after add " + i, i + 1, src.getLength());
        }

        final int largerLength = DEFAULT_CAPACITY * 2;
        src.setLength(largerLength);
        final int[] array2 = src.getPrimitiveArray();
        assertEquals("length after larger setLength", largerLength, src.getLength());
        assertNotSame("array after larger setLength", array, array2);
        assertEquals("array length after larger setLength", largerLength, array2.length);
        for (int i = 0; i < DEFAULT_CAPACITY; i++) {
            assertEquals("value at " + i, i, src.get(i));
        }
        for (int i = DEFAULT_CAPACITY; i < largerLength; i++) {
            assertEquals("value at " + i, 0, src.get(i));
        }

        final int smallerLength = DEFAULT_CAPACITY / 2;
        src.setLength(smallerLength);
        final int[] array3 = src.getPrimitiveArray();
        assertEquals("length after smaller setLength", smallerLength, src.getLength());
        assertSame("array after smaller setLength", array2, array3);
        assertEquals("array length after smaller setLength", largerLength, array3.length);
        for (int i = 0; i < smallerLength; i++) {
            assertEquals("value at " + i, i, src.get(i));
        }
    }

    public void testSet() {
        final ResizableIntArray src = new ResizableIntArray(DEFAULT_CAPACITY);
        final int limit = DEFAULT_CAPACITY * 2 + 10;
        for (int i = 0; i < limit; i++) {
            src.add(i);
        }

        final ResizableIntArray dst = new ResizableIntArray(DEFAULT_CAPACITY);
        dst.set(src);
        assertEquals("length after set", dst.getLength(), src.getLength());
        assertSame("array after set", dst.getPrimitiveArray(), src.getPrimitiveArray());
    }

    public void testCopy() {
        final ResizableIntArray src = new ResizableIntArray(DEFAULT_CAPACITY);
        for (int i = 0; i < DEFAULT_CAPACITY; i++) {
            src.add(i);
        }

        final ResizableIntArray dst = new ResizableIntArray(DEFAULT_CAPACITY);
        final int[] array = dst.getPrimitiveArray();
        dst.copy(src);
        assertEquals("length after copy", dst.getLength(), src.getLength());
        assertSame("array after copy", array, dst.getPrimitiveArray());
        assertNotSame("array after copy", dst.getPrimitiveArray(), src.getPrimitiveArray());
        assertArrayEquals("values after copy",
                dst.getPrimitiveArray(), 0, src.getPrimitiveArray(), 0, dst.getLength());

        final int smallerLength = DEFAULT_CAPACITY / 2;
        dst.reset(smallerLength);
        final int[] array2 = dst.getPrimitiveArray();
        dst.copy(src);
        final int[] array3 = dst.getPrimitiveArray();
        assertEquals("length after copy to smaller", dst.getLength(), src.getLength());
        assertNotSame("array after copy to smaller", array2, array3);
        assertNotSame("array after copy to smaller", array3, src.getPrimitiveArray());
        assertArrayEquals("values after copy to smaller",
                dst.getPrimitiveArray(), 0, src.getPrimitiveArray(), 0, dst.getLength());
    }

    public void testAppend() {
        final int srcLen = DEFAULT_CAPACITY;
        final ResizableIntArray src = new ResizableIntArray(srcLen);
        for (int i = 0; i < srcLen; i++) {
            src.add(i);
        }
        final ResizableIntArray dst = new ResizableIntArray(DEFAULT_CAPACITY * 2);
        final int[] array = dst.getPrimitiveArray();
        final int dstLen = DEFAULT_CAPACITY / 2;
        for (int i = 0; i < dstLen; i++) {
            final int value = -i - 1;
            dst.add(value);
        }
        final ResizableIntArray dstCopy = new ResizableIntArray(dst.getLength());
        dstCopy.copy(dst);

        dst.append(src, 0, 0);
        assertEquals("length after append zero", dstLen, dst.getLength());
        assertSame("array after append zero", array, dst.getPrimitiveArray());
        assertArrayEquals("values after append zero",
                dstCopy.getPrimitiveArray(), 0, dst.getPrimitiveArray(), 0, dstLen);

        dst.append(src, 0, srcLen);
        assertEquals("length after append", dstLen + srcLen, dst.getLength());
        assertSame("array after append", array, dst.getPrimitiveArray());
        assertTrue("primitive length after append",
                dst.getPrimitiveArray().length >= dstLen + srcLen);
        assertArrayEquals("original values after append",
                dstCopy.getPrimitiveArray(), 0, dst.getPrimitiveArray(), 0, dstLen);
        assertArrayEquals("appended values after append",
                src.getPrimitiveArray(), 0, dst.getPrimitiveArray(), dstLen, srcLen);

        dst.append(src, 0, srcLen);
        assertEquals("length after 2nd append", dstLen + srcLen * 2, dst.getLength());
        assertNotSame("array after 2nd append", array, dst.getPrimitiveArray());
        assertTrue("primitive length after 2nd append",
                dst.getPrimitiveArray().length >= dstLen + srcLen * 2);
        assertArrayEquals("original values after 2nd append",
                dstCopy.getPrimitiveArray(), 0, dst.getPrimitiveArray(), 0, dstLen);
        assertArrayEquals("appended values after 2nd append",
                src.getPrimitiveArray(), 0, dst.getPrimitiveArray(), dstLen, srcLen);
        assertArrayEquals("appended values after 2nd append",
                src.getPrimitiveArray(), 0, dst.getPrimitiveArray(), dstLen + srcLen, srcLen);
    }

    private static void assertArrayEquals(String message, int[] expecteds, int expectedPos,
            int[] actuals, int actualPos, int length) {
        if (expecteds == null && actuals == null) {
            return;
        }
        if (expecteds == null || actuals == null) {
            fail(message + ": expecteds=" + expecteds + " actuals=" + actuals);
        }
        for (int i = 0; i < length; i++) {
            assertEquals(message + ": element at " + i,
                    expecteds[i + expectedPos], actuals[i + actualPos]);
        }
    }
}