/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the "Elastic License
 * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
 * Public License v 1"; you may not use this file except in compliance with, at
 * your election, the "Elastic License 2.0", the "GNU Affero General Public
 * License v3.0 only", or the "Server Side Public License, v 1".
 */

package org.elasticsearch.nativeaccess;

import org.elasticsearch.test.ESTestCase;
import org.junit.Before;

import java.io.IOException;
import java.nio.file.Path;
import java.util.OptionalLong;

import static org.hamcrest.Matchers.equalTo;

public class PreallocateTests extends ESTestCase {

    @Before
    public void setup() {
        assumeFalse("no preallocate on windows", System.getProperty("os.name").startsWith("Windows"));
        assumeFalse("preallocate not supported on encrypted block devices", "encryption-at-rest".equals(System.getenv("BUILDKITE_LABEL")));
    }

    public void testPreallocate() throws IOException {
        Path file = createTempFile();
        long size = 1024 * 1024; // 1 MB
        var nativeAccess = NativeAccess.instance();
        nativeAccess.tryPreallocate(file, size);
        OptionalLong foundSize = nativeAccess.allocatedSizeInBytes(file);
        assertTrue(foundSize.isPresent());
        assertThat(foundSize.getAsLong(), equalTo(size));
    }

    public void testPreallocateNonExistingFile() {
        Path file = createTempDir().resolve("intermediate-dir").resolve("test-preallocate");
        long size = 1024 * 1024; // 1 MB
        var nativeAccess = NativeAccess.instance();
        nativeAccess.tryPreallocate(file, size);
        OptionalLong foundSize = nativeAccess.allocatedSizeInBytes(file);
        assertTrue(foundSize.isPresent());
        assertThat(foundSize.getAsLong(), equalTo(size));
    }

    public void testPreallocateNonExistingDirectory() {
        Path file = createTempDir().resolve("intermediate-dir").resolve("test-preallocate");
        long size = 1024 * 1024; // 1 MB
        var nativeAccess = NativeAccess.instance();
        nativeAccess.tryPreallocate(file, size);
        OptionalLong foundSize = nativeAccess.allocatedSizeInBytes(file);
        assertTrue(foundSize.isPresent());
        assertThat(foundSize.getAsLong(), equalTo(size));
    }
}