/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2018 Yegor Bugayenko
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.cactoos.http.io;

import java.util.Arrays;
import org.hamcrest.MatcherAssert;
import org.hamcrest.core.IsEqual;
import org.junit.Test;

/**
 * Test case for {@link BoundedByteBuffer}.
 *
 * @since 0.1
 * @checkstyle JavadocMethodCheck (500 lines)
 * @checkstyle MagicNumberCheck (500 lines)
 */
public final class BoundedByteBufferTest {

    @Test
    public void worksWithEqualSameSizeArray() {
        final int limit = 4;
        final BoundedByteBuffer buffer = new BoundedByteBuffer(limit);
        buffer.offer((byte) 11);
        final int[] bytes = {1, 2, 3, 4};
        Arrays.stream(bytes).forEach(b -> buffer.offer((byte) b));
        MatcherAssert.assertThat(
            buffer.equalTo(new byte[]{1, 2, 3, 4}),
            new IsEqual<>(true)
        );
    }

    @Test
    public void worksWithUnequalSameSizeArray() {
        final int limit = 4;
        final BoundedByteBuffer buffer = new BoundedByteBuffer(limit);
        buffer.offer((byte) 11);
        final int[] bytes = {1, 2, 3, 5};
        Arrays.stream(bytes).forEach(b -> buffer.offer((byte) b));
        MatcherAssert.assertThat(
            buffer.equalTo(new byte[]{1, 2, 3, 4}),
            new IsEqual<>(false)
        );
    }

    @Test
    public void onlyKeepsTheLastNBytes() {
        final int limit = 4;
        final BoundedByteBuffer buffer = new BoundedByteBuffer(limit);
        final int[] bytes = {1, 2, 3, 4, 5, 6, 7, 8 };
        Arrays.stream(bytes).forEach(b -> buffer.offer((byte) b));
        MatcherAssert.assertThat(
            buffer.equalTo(new byte[] {5, 6, 7, 8 }),
            new IsEqual<>(true)
        );
    }

    @Test
    public void worksWithSmallerArray() {
        final int limit = 4;
        final BoundedByteBuffer buffer = new BoundedByteBuffer(limit);
        final int[] bytes = {1, 2};
        Arrays.stream(bytes).forEach(b -> buffer.offer((byte) b));
        MatcherAssert.assertThat(
            buffer.equalTo(new byte[] {1, 2}),
            new IsEqual<>(true)
        );
    }

    @Test
    public void worksWithSmallerArrayFailsComparisonWithLarger() {
        final int limit = 4;
        final BoundedByteBuffer buffer = new BoundedByteBuffer(limit);
        final int[] bytes = {1, 2};
        Arrays.stream(bytes).forEach(b -> buffer.offer((byte) b));
        MatcherAssert.assertThat(
            buffer.equalTo(new byte[] {1, 2, 0}),
            new IsEqual<>(false)
        );
    }

    @Test
    public void equalsWhenShiftedOdd() {
        final int limit = 4;
        final BoundedByteBuffer buffer = new BoundedByteBuffer(limit);
        buffer.offer((byte) 11);
        final int[] bytes = {1, 2, 1, 2};
        Arrays.stream(bytes).forEach(b -> buffer.offer((byte) b));
        MatcherAssert.assertThat(
            buffer.equalTo(new byte[]{1, 2, 1, 2}),
            new IsEqual<>(true)
        );
    }
}