/*
 * 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.snapshot;

import org.apache.kafka.common.utils.Utils;
import org.apache.kafka.server.common.OffsetAndEpoch;
import org.apache.kafka.test.TestUtils;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.ValueSource;

import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Optional;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;

public final class SnapshotsTest {

    @Test
    public void testValidSnapshotFilename() {
        OffsetAndEpoch snapshotId = new OffsetAndEpoch(
            TestUtils.RANDOM.nextInt(Integer.MAX_VALUE),
            TestUtils.RANDOM.nextInt(Integer.MAX_VALUE)
        );
        Path path = Snapshots.snapshotPath(TestUtils.tempDirectory().toPath(), snapshotId);
        SnapshotPath snapshotPath = Snapshots.parse(path).get();

        assertEquals(path, snapshotPath.path());
        assertEquals(snapshotId, snapshotPath.snapshotId());
        assertFalse(snapshotPath.partial());
        assertFalse(snapshotPath.deleted());
    }

    @Test
    public void testValidPartialSnapshotFilename() throws IOException {
        OffsetAndEpoch snapshotId = new OffsetAndEpoch(
            TestUtils.RANDOM.nextInt(Integer.MAX_VALUE),
            TestUtils.RANDOM.nextInt(Integer.MAX_VALUE)
        );

        Path path = Snapshots.createTempFile(TestUtils.tempDirectory().toPath(), snapshotId);
        // Delete it as we only need the path for testing
        Files.delete(path);

        SnapshotPath snapshotPath = Snapshots.parse(path).get();

        assertEquals(path, snapshotPath.path());
        assertEquals(snapshotId, snapshotPath.snapshotId());
        assertTrue(snapshotPath.partial());
    }

    @Test
    public void testValidDeletedSnapshotFilename() {
        OffsetAndEpoch snapshotId = new OffsetAndEpoch(
            TestUtils.RANDOM.nextInt(Integer.MAX_VALUE),
            TestUtils.RANDOM.nextInt(Integer.MAX_VALUE)
        );
        Path path = Snapshots.snapshotPath(TestUtils.tempDirectory().toPath(), snapshotId);
        Path deletedPath = Snapshots.deleteRenamePath(path, snapshotId);
        SnapshotPath snapshotPath = Snapshots.parse(deletedPath).get();

        assertEquals(snapshotId, snapshotPath.snapshotId());
        assertTrue(snapshotPath.deleted());
    }

    @Test
    public void testInvalidSnapshotFilenames() {
        Path root = FileSystems.getDefault().getPath("/");
        // Doesn't parse log files
        assertEquals(Optional.empty(), Snapshots.parse(root.resolve("00000000000000000000.log")));
        // Doesn't parse producer snapshots
        assertEquals(Optional.empty(), Snapshots.parse(root.resolve("00000000000000000000.snapshot")));
        // Doesn't parse offset indexes
        assertEquals(Optional.empty(), Snapshots.parse(root.resolve("00000000000000000000.index")));
        assertEquals(Optional.empty(), Snapshots.parse(root.resolve("00000000000000000000.timeindex")));
        // Leader epoch checkpoint
        assertEquals(Optional.empty(), Snapshots.parse(root.resolve("leader-epoch-checkpoint")));
        // partition metadata
        assertEquals(Optional.empty(), Snapshots.parse(root.resolve("partition.metadata")));
    }

    @ParameterizedTest
    @ValueSource(booleans = {true, false})
    public void testDeleteSnapshot(boolean renameBeforeDeleting) throws IOException {

        OffsetAndEpoch snapshotId = new OffsetAndEpoch(
            TestUtils.RANDOM.nextInt(Integer.MAX_VALUE),
            TestUtils.RANDOM.nextInt(Integer.MAX_VALUE)
        );

        Path logDirPath = TestUtils.tempDirectory().toPath();
        try (FileRawSnapshotWriter snapshot = FileRawSnapshotWriter.create(logDirPath, snapshotId)) {
            snapshot.freeze();

            Path snapshotPath = Snapshots.snapshotPath(logDirPath, snapshotId);
            assertTrue(Files.exists(snapshotPath));

            if (renameBeforeDeleting)
                // rename snapshot before deleting
                Utils.atomicMoveWithFallback(snapshotPath, Snapshots.deleteRenamePath(snapshotPath, snapshotId), false);

            assertTrue(Snapshots.deleteIfExists(logDirPath, snapshot.snapshotId()));
            assertFalse(Files.exists(snapshotPath));
            assertFalse(Files.exists(Snapshots.deleteRenamePath(snapshotPath, snapshotId)));
        }
    }
}
