/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * 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 the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>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.apereo.portal.portlet.container.cache;

import static junit.framework.Assert.assertFalse;
import static junit.framework.Assert.assertTrue;
import static org.junit.Assert.assertArrayEquals;

import com.google.common.base.Function;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;
import org.apache.commons.io.output.NullOutputStream;
import org.junit.Test;
/**
 * Tests for {@link LimitingTeeOutputStream}.
 */
public class LimitingTeeOutputStreamTest {

    @Test
    public void testControl() throws IOException {
        final byte[] content = "<p>Simple content</p>".getBytes();
        ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
        LimitingTeeOutputStream stream =
                new LimitingTeeOutputStream(
                        content.length, NullOutputStream.NULL_OUTPUT_STREAM, byteStream);
        stream.write(content);

        assertFalse(stream.isLimitReached());
        assertArrayEquals(content, byteStream.toByteArray());
    }

    @Test
    public void testContentExceedsThreshold() throws IOException {
        final byte[] content = "<p>Simple content</p>".getBytes();
        ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
        LimitingTeeOutputStream stream =
                new LimitingTeeOutputStream(
                        content.length - 1, NullOutputStream.NULL_OUTPUT_STREAM, byteStream);
        stream.write(content);

        assertTrue(stream.isLimitReached());
        assertArrayEquals(new byte[0], byteStream.toByteArray());
        // try to write more and see no results
        stream.write("a".getBytes());
        assertArrayEquals(new byte[0], byteStream.toByteArray());
    }

    @Test
    public void testContentExceedsClearBuffer() throws IOException {
        final byte[] content = "<p>Simple content</p>".getBytes();
        final ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
        LimitingTeeOutputStream stream =
                new LimitingTeeOutputStream(
                        content.length - 1,
                        NullOutputStream.NULL_OUTPUT_STREAM,
                        byteStream,
                        new Function<LimitingTeeOutputStream, Object>() {
                            @Override
                            public Object apply(LimitingTeeOutputStream input) {
                                byteStream.reset();
                                return null;
                            }
                        });
        // write the first few chars
        stream.write(content, 0, 5);
        // verify content successfully buffered
        assertFalse(stream.isLimitReached());
        final byte[] subContent = Arrays.copyOf(content, 5);
        assertArrayEquals(subContent, byteStream.toByteArray());

        // now write the remainder
        stream.write(content, 5, content.length);

        assertTrue(stream.isLimitReached());
        assertArrayEquals(new byte[0], byteStream.toByteArray());
        // try to write more and see no results
        stream.write("a".getBytes());
        assertArrayEquals(new byte[0], byteStream.toByteArray());
    }

    @Test
    public void testContentExceedsResetBuffer() throws IOException {
        final byte[] content = "<p>Simple content</p>".getBytes();
        ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
        LimitingTeeOutputStream stream =
                new LimitingTeeOutputStream(
                        content.length - 1, NullOutputStream.NULL_OUTPUT_STREAM, byteStream);
        stream.write(content);

        assertTrue(stream.isLimitReached());
        assertArrayEquals(new byte[0], byteStream.toByteArray());

        stream.resetByteCount();

        // try to write more and see results
        stream.write("a".getBytes());
        assertArrayEquals("a".getBytes(), byteStream.toByteArray());
    }
}