/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.elasticsearch.common.io.stream;

import org.elasticsearch.common.collect.Tuple;
import org.elasticsearch.test.ESTestCase;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

public class StreamTests extends ESTestCase {
    public void testLinkedHashMap() throws IOException {
        int size = randomIntBetween(1, 1024);
        boolean accessOrder = randomBoolean();
        List<Tuple<String, Integer>> list = new ArrayList<>(size);
        LinkedHashMap<String, Integer> write = new LinkedHashMap<>(size, 0.75f, accessOrder);
        for (int i = 0; i < size; i++) {
            int value = randomInt();
            list.add(new Tuple<>(Integer.toString(i), value));
            write.put(Integer.toString(i), value);
        }
        if (accessOrder) {
            // randomize access order
            Collections.shuffle(list, random());
            for (Tuple<String, Integer> entry : list) {
                // touch the entries to set the access order
                write.get(entry.v1());
            }
        }
        BytesStreamOutput out = new BytesStreamOutput();
        out.writeGenericValue(write);
        LinkedHashMap<String, Integer> read = (LinkedHashMap<String, Integer>)out.bytes().streamInput().readGenericValue();
        assertEquals(size, read.size());
        int index = 0;
        for (Map.Entry<String, Integer> entry : read.entrySet()) {
            assertEquals(list.get(index).v1(), entry.getKey());
            assertEquals(list.get(index).v2(), entry.getValue());
            index++;
        }
    }

    public void testFilterStreamInputDelegatesAvailable() throws IOException {
        final int length = randomIntBetween(1, 1024);
        StreamInput delegate = StreamInput.wrap(new byte[length]);

        FilterStreamInput filterInputStream = new FilterStreamInput(delegate) {};
        assertEquals(filterInputStream.available(), length);

        // read some bytes
        final int bytesToRead = randomIntBetween(1, length);
        filterInputStream.readBytes(new byte[bytesToRead], 0, bytesToRead);
        assertEquals(filterInputStream.available(), length - bytesToRead);
    }

    public void testInputStreamStreamInputDelegatesAvailable() throws IOException {
        final int length = randomIntBetween(1, 1024);
        ByteArrayInputStream is = new ByteArrayInputStream(new byte[length]);
        InputStreamStreamInput streamInput = new InputStreamStreamInput(is);
        assertEquals(streamInput.available(), length);

        // read some bytes
        final int bytesToRead = randomIntBetween(1, length);
        streamInput.readBytes(new byte[bytesToRead], 0, bytesToRead);
        assertEquals(streamInput.available(), length - bytesToRead);
    }
}