/*
 * 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.action.ingest;

import org.opensearch.core.common.bytes.BytesReference;
import org.opensearch.common.io.stream.BytesStreamOutput;
import org.opensearch.core.common.io.stream.StreamInput;
import org.opensearch.core.xcontent.XContentBuilder;
import org.opensearch.common.xcontent.XContentFactory;
import org.opensearch.common.xcontent.XContentHelper;
import org.opensearch.core.xcontent.XContentParser;
import org.opensearch.common.xcontent.XContentType;
import org.opensearch.ingest.RandomDocumentPicks;
import org.opensearch.ingest.IngestDocument;
import org.opensearch.test.AbstractXContentTestCase;
import org.opensearch.test.RandomObjects;

import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.StringJoiner;
import java.util.function.Predicate;

import static org.opensearch.core.xcontent.ToXContent.EMPTY_PARAMS;
import static org.opensearch.ingest.IngestDocumentMatcher.assertIngestDocument;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.not;

public class WriteableIngestDocumentTests extends AbstractXContentTestCase<WriteableIngestDocument> {

    public void testEqualsAndHashcode() throws Exception {
        Map<String, Object> sourceAndMetadata = RandomDocumentPicks.randomSource(random());
        int numFields = randomIntBetween(1, IngestDocument.Metadata.values().length);
        for (int i = 0; i < numFields; i++) {
            sourceAndMetadata.put(randomFrom(IngestDocument.Metadata.values()).getFieldName(), randomAlphaOfLengthBetween(5, 10));
        }
        Map<String, Object> ingestMetadata = new HashMap<>();
        numFields = randomIntBetween(1, 5);
        for (int i = 0; i < numFields; i++) {
            ingestMetadata.put(randomAlphaOfLengthBetween(5, 10), randomAlphaOfLengthBetween(5, 10));
        }
        WriteableIngestDocument ingestDocument = new WriteableIngestDocument(new IngestDocument(sourceAndMetadata, ingestMetadata));

        boolean changed = false;
        Map<String, Object> otherSourceAndMetadata;
        if (randomBoolean()) {
            otherSourceAndMetadata = RandomDocumentPicks.randomSource(random());
            changed = true;
        } else {
            otherSourceAndMetadata = new HashMap<>(sourceAndMetadata);
        }
        if (randomBoolean()) {
            numFields = randomIntBetween(1, IngestDocument.Metadata.values().length);
            for (int i = 0; i < numFields; i++) {
                otherSourceAndMetadata.put(randomFrom(IngestDocument.Metadata.values()).getFieldName(), randomAlphaOfLengthBetween(5, 10));
            }
            changed = true;
        }

        Map<String, Object> otherIngestMetadata;
        if (randomBoolean()) {
            otherIngestMetadata = new HashMap<>();
            numFields = randomIntBetween(1, 5);
            for (int i = 0; i < numFields; i++) {
                otherIngestMetadata.put(randomAlphaOfLengthBetween(5, 10), randomAlphaOfLengthBetween(5, 10));
            }
            changed = true;
        } else {
            otherIngestMetadata = Collections.unmodifiableMap(ingestMetadata);
        }

        WriteableIngestDocument otherIngestDocument = new WriteableIngestDocument(
            new IngestDocument(otherSourceAndMetadata, otherIngestMetadata)
        );
        if (changed) {
            assertThat(ingestDocument, not(equalTo(otherIngestDocument)));
            assertThat(otherIngestDocument, not(equalTo(ingestDocument)));
        } else {
            assertThat(ingestDocument, equalTo(otherIngestDocument));
            assertThat(otherIngestDocument, equalTo(ingestDocument));
            assertThat(ingestDocument.hashCode(), equalTo(otherIngestDocument.hashCode()));
            WriteableIngestDocument thirdIngestDocument = new WriteableIngestDocument(
                new IngestDocument(Collections.unmodifiableMap(sourceAndMetadata), Collections.unmodifiableMap(ingestMetadata))
            );
            assertThat(thirdIngestDocument, equalTo(ingestDocument));
            assertThat(ingestDocument, equalTo(thirdIngestDocument));
            assertThat(ingestDocument.hashCode(), equalTo(thirdIngestDocument.hashCode()));
        }
    }

    public void testSerialization() throws IOException {
        Map<String, Object> sourceAndMetadata = RandomDocumentPicks.randomSource(random());
        int numFields = randomIntBetween(1, IngestDocument.Metadata.values().length);
        for (int i = 0; i < numFields; i++) {
            sourceAndMetadata.put(randomFrom(IngestDocument.Metadata.values()).getFieldName(), randomAlphaOfLengthBetween(5, 10));
        }
        Map<String, Object> ingestMetadata = new HashMap<>();
        numFields = randomIntBetween(1, 5);
        for (int i = 0; i < numFields; i++) {
            ingestMetadata.put(randomAlphaOfLengthBetween(5, 10), randomAlphaOfLengthBetween(5, 10));
        }
        WriteableIngestDocument writeableIngestDocument = new WriteableIngestDocument(
            new IngestDocument(sourceAndMetadata, ingestMetadata)
        );

        BytesStreamOutput out = new BytesStreamOutput();
        writeableIngestDocument.writeTo(out);
        StreamInput streamInput = out.bytes().streamInput();
        WriteableIngestDocument otherWriteableIngestDocument = new WriteableIngestDocument(streamInput);
        assertIngestDocument(otherWriteableIngestDocument.getIngestDocument(), writeableIngestDocument.getIngestDocument());
    }

    @SuppressWarnings("unchecked")
    public void testToXContent() throws IOException {
        IngestDocument ingestDocument = RandomDocumentPicks.randomIngestDocument(random());
        WriteableIngestDocument writeableIngestDocument = new WriteableIngestDocument(new IngestDocument(ingestDocument));

        // using a cbor builder here, so that byte arrays do not get converted, so equalTo() below works
        XContentBuilder builder = XContentFactory.cborBuilder();
        builder.startObject();
        writeableIngestDocument.toXContent(builder, EMPTY_PARAMS);
        builder.endObject();
        Map<String, Object> toXContentMap = XContentHelper.convertToMap(BytesReference.bytes(builder), false, builder.contentType()).v2();

        Map<String, Object> toXContentDoc = (Map<String, Object>) toXContentMap.get("doc");
        Map<String, Object> toXContentSource = (Map<String, Object>) toXContentDoc.get("_source");
        Map<String, Object> toXContentIngestMetadata = (Map<String, Object>) toXContentDoc.get("_ingest");

        Map<IngestDocument.Metadata, Object> metadataMap = ingestDocument.extractMetadata();
        for (Map.Entry<IngestDocument.Metadata, Object> metadata : metadataMap.entrySet()) {
            String fieldName = metadata.getKey().getFieldName();
            if (metadata.getValue() == null) {
                assertThat(toXContentDoc.containsKey(fieldName), is(false));
            } else {
                assertThat(toXContentDoc.get(fieldName), equalTo(metadata.getValue().toString()));
            }
        }

        IngestDocument serializedIngestDocument = new IngestDocument(toXContentSource, toXContentIngestMetadata);
        assertThat(serializedIngestDocument, equalTo(serializedIngestDocument));
    }

    static IngestDocument createRandomIngestDoc() {
        XContentType xContentType = randomFrom(XContentType.values());
        BytesReference sourceBytes = RandomObjects.randomSource(random(), xContentType);
        Map<String, Object> randomSource = XContentHelper.convertToMap(sourceBytes, false, xContentType).v2();
        return RandomDocumentPicks.randomIngestDocument(random(), randomSource);
    }

    @Override
    protected boolean supportsUnknownFields() {
        return true;
    }

    @Override
    protected WriteableIngestDocument createTestInstance() {
        return new WriteableIngestDocument(createRandomIngestDoc());
    }

    @Override
    protected WriteableIngestDocument doParseInstance(XContentParser parser) {
        return WriteableIngestDocument.fromXContent(parser);
    }

    @Override
    protected Predicate<String> getRandomFieldsExcludeFilter() {
        // We cannot have random fields in the _source field and _ingest field
        return field -> field.startsWith(
            new StringJoiner(".").add(WriteableIngestDocument.DOC_FIELD).add(WriteableIngestDocument.SOURCE_FIELD).toString()
        )
            || field.startsWith(
                new StringJoiner(".").add(WriteableIngestDocument.DOC_FIELD).add(WriteableIngestDocument.INGEST_FIELD).toString()
            );
    }
}