/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * 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.
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/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.ingest.common;

import org.opensearch.ingest.IngestDocument;
import org.opensearch.ingest.RandomDocumentPicks;
import org.opensearch.ingest.TestTemplateService;
import org.opensearch.script.TemplateScript;
import org.opensearch.test.OpenSearchTestCase;

import java.time.Instant;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.IllformedLocaleException;
import java.util.List;
import java.util.Locale;
import java.util.Map;

import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.instanceOf;

public class DateProcessorTests extends OpenSearchTestCase {

    private TemplateScript.Factory templatize(Locale locale) {
        return new TestTemplateService.MockTemplateScript.Factory(locale.getLanguage());
    }

    private TemplateScript.Factory templatize(ZoneId timezone) {
        return new TestTemplateService.MockTemplateScript.Factory(timezone.getId());
    }

    public void testJavaPattern() {
        DateProcessor dateProcessor = new DateProcessor(
            randomAlphaOfLength(10),
            null,
            templatize(ZoneId.of("Europe/Amsterdam")),
            templatize(Locale.ENGLISH),
            "date_as_string",
            Collections.singletonList("yyyy dd MM HH:mm:ss"),
            "date_as_date"
        );
        Map<String, Object> document = new HashMap<>();
        document.put("date_as_string", "2010 12 06 11:05:15");
        IngestDocument ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), document);
        dateProcessor.execute(ingestDocument);
        assertThat(ingestDocument.getFieldValue("date_as_date", String.class), equalTo("2010-06-12T11:05:15.000+02:00"));
    }

    public void testJavaPatternMultipleFormats() {
        List<String> matchFormats = new ArrayList<>();
        matchFormats.add("yyyy dd MM");
        matchFormats.add("dd/MM/yyyy");
        matchFormats.add("dd-MM-yyyy");
        DateProcessor dateProcessor = new DateProcessor(
            randomAlphaOfLength(10),
            null,
            templatize(ZoneId.of("Europe/Amsterdam")),
            templatize(Locale.ENGLISH),
            "date_as_string",
            matchFormats,
            "date_as_date"
        );

        Map<String, Object> document = new HashMap<>();
        document.put("date_as_string", "2010 12 06");
        IngestDocument ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), document);
        dateProcessor.execute(ingestDocument);
        assertThat(ingestDocument.getFieldValue("date_as_date", String.class), equalTo("2010-06-12T00:00:00.000+02:00"));

        document = new HashMap<>();
        document.put("date_as_string", "12/06/2010");
        ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), document);
        dateProcessor.execute(ingestDocument);
        assertThat(ingestDocument.getFieldValue("date_as_date", String.class), equalTo("2010-06-12T00:00:00.000+02:00"));

        document = new HashMap<>();
        document.put("date_as_string", "12-06-2010");
        ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), document);
        dateProcessor.execute(ingestDocument);
        assertThat(ingestDocument.getFieldValue("date_as_date", String.class), equalTo("2010-06-12T00:00:00.000+02:00"));

        document = new HashMap<>();
        document.put("date_as_string", "2010");
        ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), document);
        try {
            dateProcessor.execute(ingestDocument);
            fail("processor should have failed due to not supported date format");
        } catch (IllegalArgumentException e) {
            assertThat(e.getMessage(), containsString("unable to parse date [2010]"));
        }
    }

    public void testJavaPatternNoTimezone() {
        DateProcessor dateProcessor = new DateProcessor(
            randomAlphaOfLength(10),
            null,
            null,
            null,
            "date_as_string",
            Arrays.asList("yyyy dd MM HH:mm:ss XXX"),
            "date_as_date"
        );

        Map<String, Object> document = new HashMap<>();
        document.put("date_as_string", "2010 12 06 00:00:00 -02:00");
        IngestDocument ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), document);
        dateProcessor.execute(ingestDocument);
        assertThat(ingestDocument.getFieldValue("date_as_date", String.class), equalTo("2010-06-12T02:00:00.000Z"));
    }

    public void testInvalidJavaPattern() {
        try {
            DateProcessor processor = new DateProcessor(
                randomAlphaOfLength(10),
                null,
                templatize(ZoneOffset.UTC),
                templatize(randomLocale(random())),
                "date_as_string",
                Collections.singletonList("invalid pattern"),
                "date_as_date"
            );
            Map<String, Object> document = new HashMap<>();
            document.put("date_as_string", "2010");
            processor.execute(RandomDocumentPicks.randomIngestDocument(random(), document));
            fail("date processor execution should have failed");
        } catch (IllegalArgumentException e) {
            assertThat(e.getMessage(), equalTo("unable to parse date [2010]"));
            assertThat(e.getCause().getMessage(), equalTo("Invalid format: [invalid pattern]: Unknown pattern letter: i"));
        }
    }

    public void testJavaPatternLocale() {
        DateProcessor dateProcessor = new DateProcessor(
            randomAlphaOfLength(10),
            null,
            templatize(ZoneId.of("Europe/Amsterdam")),
            templatize(Locale.ITALIAN),
            "date_as_string",
            Collections.singletonList("yyyy dd MMMM"),
            "date_as_date"
        );
        Map<String, Object> document = new HashMap<>();
        document.put("date_as_string", "2010 12 giugno");
        IngestDocument ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), document);
        dateProcessor.execute(ingestDocument);
        assertThat(ingestDocument.getFieldValue("date_as_date", String.class), equalTo("2010-06-12T00:00:00.000+02:00"));
    }

    public void testJavaPatternEnglishLocale() {
        // Since testJavaPatternLocale is muted in FIPS mode, test that we can correctly parse dates in english
        DateProcessor dateProcessor = new DateProcessor(
            randomAlphaOfLength(10),
            null,
            templatize(ZoneId.of("Europe/Amsterdam")),
            templatize(Locale.ENGLISH),
            "date_as_string",
            Collections.singletonList("yyyy dd MMMM"),
            "date_as_date"
        );
        Map<String, Object> document = new HashMap<>();
        document.put("date_as_string", "2010 12 June");
        IngestDocument ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), document);
        dateProcessor.execute(ingestDocument);
        assertThat(ingestDocument.getFieldValue("date_as_date", String.class), equalTo("2010-06-12T00:00:00.000+02:00"));
    }

    public void testJavaPatternDefaultYear() {
        String format = randomFrom("dd/MM", "8dd/MM");
        DateProcessor dateProcessor = new DateProcessor(
            randomAlphaOfLength(10),
            null,
            templatize(ZoneId.of("Europe/Amsterdam")),
            templatize(Locale.ENGLISH),
            "date_as_string",
            Collections.singletonList(format),
            "date_as_date"
        );
        Map<String, Object> document = new HashMap<>();
        document.put("date_as_string", "12/06");
        IngestDocument ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), document);
        dateProcessor.execute(ingestDocument);
        assertThat(
            ingestDocument.getFieldValue("date_as_date", String.class),
            equalTo(ZonedDateTime.now(ZoneId.of("Europe/Amsterdam")).getYear() + "-06-12T00:00:00.000+02:00")
        );
    }

    public void testTAI64N() {
        DateProcessor dateProcessor = new DateProcessor(
            randomAlphaOfLength(10),
            null,
            templatize(ZoneOffset.ofHours(2)),
            templatize(randomLocale(random())),
            "date_as_string",
            Collections.singletonList("TAI64N"),
            "date_as_date"
        );
        Map<String, Object> document = new HashMap<>();
        String dateAsString = (randomBoolean() ? "@" : "") + "4000000050d506482dbdf024";
        document.put("date_as_string", dateAsString);
        IngestDocument ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), document);
        dateProcessor.execute(ingestDocument);
        assertThat(ingestDocument.getFieldValue("date_as_date", String.class), equalTo("2012-12-22T03:00:46.767+02:00"));
    }

    public void testUnixMs() {
        DateProcessor dateProcessor = new DateProcessor(
            randomAlphaOfLength(10),
            null,
            templatize(ZoneOffset.UTC),
            templatize(randomLocale(random())),
            "date_as_string",
            Collections.singletonList("UNIX_MS"),
            "date_as_date"
        );
        Map<String, Object> document = new HashMap<>();
        document.put("date_as_string", "1000500");
        IngestDocument ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), document);
        dateProcessor.execute(ingestDocument);
        assertThat(ingestDocument.getFieldValue("date_as_date", String.class), equalTo("1970-01-01T00:16:40.500Z"));

        document = new HashMap<>();
        document.put("date_as_string", 1000500L);
        ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), document);
        dateProcessor.execute(ingestDocument);
        assertThat(ingestDocument.getFieldValue("date_as_date", String.class), equalTo("1970-01-01T00:16:40.500Z"));
    }

    public void testUnix() {
        DateProcessor dateProcessor = new DateProcessor(
            randomAlphaOfLength(10),
            null,
            templatize(ZoneOffset.UTC),
            templatize(randomLocale(random())),
            "date_as_string",
            Collections.singletonList("UNIX"),
            "date_as_date"
        );
        Map<String, Object> document = new HashMap<>();
        document.put("date_as_string", "1000.5");
        IngestDocument ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), document);
        dateProcessor.execute(ingestDocument);
        assertThat(ingestDocument.getFieldValue("date_as_date", String.class), equalTo("1970-01-01T00:16:40.500Z"));
    }

    public void testInvalidTimezone() {
        DateProcessor processor = new DateProcessor(
            randomAlphaOfLength(10),
            null,
            new TestTemplateService.MockTemplateScript.Factory("invalid_timezone"),
            templatize(randomLocale(random())),
            "date_as_string",
            Collections.singletonList("yyyy"),
            "date_as_date"
        );
        Map<String, Object> document = new HashMap<>();
        document.put("date_as_string", "2010");
        IllegalArgumentException e = expectThrows(
            IllegalArgumentException.class,
            () -> processor.execute(RandomDocumentPicks.randomIngestDocument(random(), document))
        );
        assertThat(e.getMessage(), equalTo("unable to parse date [2010]"));
        assertThat(e.getCause().getMessage(), equalTo("Unknown time-zone ID: invalid_timezone"));
    }

    public void testInvalidLocale() {
        DateProcessor processor = new DateProcessor(
            randomAlphaOfLength(10),
            null,
            templatize(ZoneOffset.UTC),
            new TestTemplateService.MockTemplateScript.Factory("invalid_locale"),
            "date_as_string",
            Collections.singletonList("yyyy"),
            "date_as_date"
        );
        Map<String, Object> document = new HashMap<>();
        document.put("date_as_string", "2010");
        IllegalArgumentException e = expectThrows(
            IllegalArgumentException.class,
            () -> processor.execute(RandomDocumentPicks.randomIngestDocument(random(), document))
        );
        assertThat(e.getMessage(), equalTo("unable to parse date [2010]"));
        assertThat(e.getCause(), instanceOf(IllformedLocaleException.class));
    }

    public void testOutputFormat() {
        long nanosAfterEpoch = randomLongBetween(1, 999999);
        DateProcessor processor = new DateProcessor(
            randomAlphaOfLength(10),
            null,
            null,
            null,
            "date_as_string",
            Collections.singletonList("iso8601"),
            "date_as_date",
            "HH:mm:ss.SSSSSSSSS"
        );
        Map<String, Object> document = new HashMap<>();
        document.put("date_as_string", Instant.EPOCH.plusNanos(nanosAfterEpoch).toString());
        IngestDocument ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), document);
        processor.execute(ingestDocument);
        // output format is time only with nanosecond precision
        String expectedDate = "00:00:00." + String.format(Locale.ROOT, "%09d", nanosAfterEpoch);
        assertThat(ingestDocument.getFieldValue("date_as_date", String.class), equalTo(expectedDate));
    }
}
