/*
 * 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.ingest.geoip;

import org.elasticsearch.core.IOUtils;
import org.elasticsearch.test.ESTestCase;
import org.junit.After;
import org.junit.Before;

import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.zip.GZIPOutputStream;

import static org.elasticsearch.ingest.geoip.GeoIpTestUtils.copyDatabase;
import static org.hamcrest.Matchers.endsWith;
import static org.hamcrest.Matchers.hasLength;
import static org.hamcrest.Matchers.is;

public class MMDBUtilTests extends ESTestCase {

    // a temporary directory that mmdb files can be copied to and read from
    private Path tmpDir;

    @Before
    public void setup() {
        tmpDir = createTempDir();
    }

    @After
    public void cleanup() throws IOException {
        IOUtils.rm(tmpDir);
    }

    public void testGetDatabaseTypeGeoIP2City() throws IOException {
        Path database = tmpDir.resolve("GeoIP2-City.mmdb");
        copyDatabase("GeoIP2-City-Test.mmdb", database);

        String type = MMDBUtil.getDatabaseType(database);
        assertThat(type, is("GeoIP2-City"));
    }

    public void testGetDatabaseTypeGeoLite2City() throws IOException {
        Path database = tmpDir.resolve("GeoLite2-City.mmdb");
        copyDatabase("GeoLite2-City-Test.mmdb", database);

        String type = MMDBUtil.getDatabaseType(database);
        assertThat(type, is("GeoLite2-City"));
    }

    public void testSmallFileWithALongDescription() throws IOException {
        Path database = tmpDir.resolve("test-description.mmdb");
        copyDatabase("test-description.mmdb", database);

        // it was once the case that we couldn't read a database_type that was 29 characters or longer
        String type = MMDBUtil.getDatabaseType(database);
        assertThat(type, endsWith("long database_type"));
        assertThat(type, hasLength(60)); // 60 is >= 29, ;)

        // it was once the case that we couldn't process an mmdb that was smaller than 512 bytes
        assertThat(Files.size(database), is(444L)); // 444 is <512
    }

    public void testIsGzip() throws IOException {
        Path database = tmpDir.resolve("GeoLite2-City.mmdb");
        copyDatabase("GeoLite2-City-Test.mmdb", database);

        Path gzipDatabase = tmpDir.resolve("GeoLite2-City.mmdb.gz");

        // gzip the test mmdb
        try (OutputStream out = new GZIPOutputStream(Files.newOutputStream(gzipDatabase))) {
            Files.copy(database, out);
        }

        assertThat(MMDBUtil.isGzip(database), is(false));
        assertThat(MMDBUtil.isGzip(gzipDatabase), is(true));
    }
}