/*
 * 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.kafka.streams.state.internals;

import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.streams.kstream.Windowed;
import org.apache.kafka.streams.kstream.internals.SessionWindow;
import org.apache.kafka.streams.state.KeyValueIterator;

import org.junit.jupiter.api.Test;

import java.util.Set;

import static org.apache.kafka.test.StreamsTestUtils.valuesToSet;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;

public class InMemorySessionStoreTest extends AbstractSessionBytesStoreTest {

    @Override
    StoreType storeType() {
        return StoreType.InMemoryStore;
    }

    @Test
    public void shouldCountNumEntries() {
        final InMemorySessionStore store = new InMemorySessionStore("test", RETENTION_PERIOD, "scope");
        store.init(context, store);

        assertEquals(0L, store.numEntries());

        store.put(
                new Windowed<>(
                        Bytes.wrap("a".getBytes()),
                        new SessionWindow(0, 0)
                ),
                "1".getBytes()
        );
        assertEquals(1L, store.numEntries());

        store.put(
                new Windowed<>(
                        Bytes.wrap("b".getBytes()),
                        new SessionWindow(0, 10)
                ),
                "2".getBytes()
        );
        assertEquals(2L, store.numEntries());

        store.put(
                new Windowed<>(
                        Bytes.wrap("a".getBytes()),
                        new SessionWindow(5, 15)
                ),
                "3".getBytes()
        );
        assertEquals(3L, store.numEntries());

        // remove one entry
        store.remove(
                new Windowed<>(
                        Bytes.wrap("a".getBytes()),
                        new SessionWindow(0, 0)
                )
        );
        assertEquals(2L, store.numEntries());

        store.close();
    }

    @Test
    public void shouldNotExpireFromOpenIterator() {

        sessionStore.put(
                new Windowed<>("a", new SessionWindow(0, 0)),
                1L
        );
        sessionStore.put(
                new Windowed<>("aa", new SessionWindow(0, 10)),
                2L
        );
        sessionStore.put(
                new Windowed<>("a", new SessionWindow(10, 20)),
                3L
        );

        final KeyValueIterator<Windowed<String>, Long> iterator = sessionStore.findSessions("a", "b", 0L, RETENTION_PERIOD);

        // Advance stream time to expire the first three record
        sessionStore.put(
                new Windowed<>(
                        "aa",
                        new SessionWindow(100, 2 * RETENTION_PERIOD)
                ),
                4L
        );

        assertEquals(Set.of(1L, 2L, 3L, 4L), valuesToSet(iterator));
        assertFalse(iterator.hasNext());

        iterator.close();

        try (final KeyValueIterator<Windowed<String>, Long> it =
             sessionStore.findSessions("a", "b", 0L, 20L)) {
            assertFalse(it.hasNext());
        }
    }

}