/*
 * 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.
 */

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

package org.opensearch.index.mapper;

import org.opensearch.common.Strings;
import org.opensearch.core.common.bytes.BytesArray;
import org.opensearch.common.compress.CompressedXContent;
import org.opensearch.common.xcontent.XContentFactory;
import org.opensearch.common.xcontent.XContentType;
import org.opensearch.index.mapper.MapperService.MergeReason;
import org.opensearch.index.mapper.ObjectMapper.Dynamic;
import org.opensearch.plugins.Plugin;
import org.opensearch.test.OpenSearchSingleNodeTestCase;
import org.opensearch.test.InternalSettingsPlugin;

import java.io.IOException;
import java.util.Collection;

import static org.hamcrest.Matchers.containsString;

public class ObjectMapperTests extends OpenSearchSingleNodeTestCase {
    public void testDifferentInnerObjectTokenFailure() throws Exception {
        String mapping = Strings.toString(XContentFactory.jsonBuilder().startObject().startObject("type").endObject().endObject());

        DocumentMapper defaultMapper = createIndex("test").mapperService()
            .documentMapperParser()
            .parse("type", new CompressedXContent(mapping));
        IllegalArgumentException e = expectThrows(IllegalArgumentException.class, () -> {
            defaultMapper.parse(
                new SourceToParse(
                    "test",
                    "1",
                    new BytesArray(
                        " {\n"
                            + "      \"object\": {\n"
                            + "        \"array\":[\n"
                            + "        {\n"
                            + "          \"object\": { \"value\": \"value\" }\n"
                            + "        },\n"
                            + "        {\n"
                            + "          \"object\":\"value\"\n"
                            + "        }\n"
                            + "        ]\n"
                            + "      },\n"
                            + "      \"value\":\"value\"\n"
                            + "    }"
                    ),
                    XContentType.JSON
                )
            );
        });
        assertTrue(e.getMessage(), e.getMessage().contains("cannot be changed from type"));
    }

    public void testEmptyArrayProperties() throws Exception {
        String mapping = Strings.toString(
            XContentFactory.jsonBuilder().startObject().startObject("type").startArray("properties").endArray().endObject().endObject()
        );
        createIndex("test").mapperService().documentMapperParser().parse("type", new CompressedXContent(mapping));
    }

    public void testEmptyFieldsArrayMultiFields() throws Exception {
        String mapping = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject("tweet")
                .startObject("properties")
                .startObject("name")
                .field("type", "text")
                .startArray("fields")
                .endArray()
                .endObject()
                .endObject()
                .endObject()
                .endObject()
        );
        createIndex("test").mapperService().documentMapperParser().parse("tweet", new CompressedXContent(mapping));
    }

    public void testFieldsArrayMultiFieldsShouldThrowException() throws Exception {
        String mapping = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject("tweet")
                .startObject("properties")
                .startObject("name")
                .field("type", "text")
                .startArray("fields")
                .startObject()
                .field("test", "string")
                .endObject()
                .startObject()
                .field("test2", "string")
                .endObject()
                .endArray()
                .endObject()
                .endObject()
                .endObject()
                .endObject()
        );
        try {
            createIndex("test").mapperService().documentMapperParser().parse("tweet", new CompressedXContent(mapping));
            fail("Expected MapperParsingException");
        } catch (MapperParsingException e) {
            assertThat(e.getMessage(), containsString("expected map for property [fields]"));
            assertThat(e.getMessage(), containsString("but got a class java.util.ArrayList"));
        }
    }

    public void testEmptyFieldsArray() throws Exception {
        String mapping = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject("tweet")
                .startObject("properties")
                .startArray("fields")
                .endArray()
                .endObject()
                .endObject()
                .endObject()
        );
        createIndex("test").mapperService().documentMapperParser().parse("tweet", new CompressedXContent(mapping));
    }

    public void testFieldsWithFilledArrayShouldThrowException() throws Exception {
        String mapping = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject("tweet")
                .startObject("properties")
                .startArray("fields")
                .startObject()
                .field("test", "string")
                .endObject()
                .startObject()
                .field("test2", "string")
                .endObject()
                .endArray()
                .endObject()
                .endObject()
                .endObject()
        );
        try {
            createIndex("test").mapperService().documentMapperParser().parse("tweet", new CompressedXContent(mapping));
            fail("Expected MapperParsingException");
        } catch (MapperParsingException e) {
            assertThat(e.getMessage(), containsString("Expected map for property [fields]"));
        }
    }

    public void testDotAsFieldName() throws Exception {
        String mapping = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject("properties")
                .startObject(".")
                .field("type", "text")
                .endObject()
                .endObject()
                .endObject()
        );

        try {
            createIndex("test").mapperService().documentMapperParser().parse("tweet", new CompressedXContent(mapping));
            fail("Expected MapperParsingException");
        } catch (MapperParsingException e) {
            assertThat(e.getMessage(), containsString("Invalid field name"));
        }
    }

    public void testFieldPropertiesArray() throws Exception {
        String mapping = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject("tweet")
                .startObject("properties")
                .startObject("name")
                .field("type", "text")
                .startObject("fields")
                .startObject("raw")
                .field("type", "keyword")
                .endObject()
                .endObject()
                .endObject()
                .endObject()
                .endObject()
                .endObject()
        );
        createIndex("test").mapperService().documentMapperParser().parse("tweet", new CompressedXContent(mapping));
    }

    public void testMerge() throws IOException {
        MergeReason reason = randomFrom(MergeReason.values());
        String mapping = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject("type")
                .startObject("properties")
                .startObject("foo")
                .field("type", "keyword")
                .endObject()
                .endObject()
                .endObject()
                .endObject()
        );
        MapperService mapperService = createIndex("test").mapperService();
        DocumentMapper mapper = mapperService.merge("type", new CompressedXContent(mapping), reason);
        assertNull(mapper.root().dynamic());
        String update = Strings.toString(
            XContentFactory.jsonBuilder().startObject().startObject("type").field("dynamic", "strict").endObject().endObject()
        );
        mapper = mapperService.merge("type", new CompressedXContent(update), reason);
        assertEquals(Dynamic.STRICT, mapper.root().dynamic());
    }

    public void testMergeEnabledForIndexTemplates() throws IOException {
        String mapping = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject("properties")
                .startObject("object")
                .field("type", "object")
                .field("enabled", false)
                .endObject()
                .endObject()
                .endObject()
        );
        MapperService mapperService = createIndex("test").mapperService();
        DocumentMapper mapper = mapperService.merge("type", new CompressedXContent(mapping), MergeReason.INDEX_TEMPLATE);
        assertNull(mapper.root().dynamic());

        // If we don't explicitly set 'enabled', then the mapping should not change.
        String update = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject("properties")
                .startObject("object")
                .field("type", "object")
                .field("dynamic", false)
                .endObject()
                .endObject()
                .endObject()
        );
        mapper = mapperService.merge("type", new CompressedXContent(update), MergeReason.INDEX_TEMPLATE);

        ObjectMapper objectMapper = mapper.objectMappers().get("object");
        assertNotNull(objectMapper);
        assertFalse(objectMapper.isEnabled());

        // Setting 'enabled' to true is allowed, and updates the mapping.
        update = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject("properties")
                .startObject("object")
                .field("type", "object")
                .field("enabled", true)
                .endObject()
                .endObject()
                .endObject()
        );
        mapper = mapperService.merge("type", new CompressedXContent(update), MergeReason.INDEX_TEMPLATE);

        objectMapper = mapper.objectMappers().get("object");
        assertNotNull(objectMapper);
        assertTrue(objectMapper.isEnabled());
    }

    public void testFieldReplacementForIndexTemplates() throws IOException {
        MapperService mapperService = createIndex("test").mapperService();
        String mapping = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject("properties")
                .startObject("object")
                .startObject("properties")
                .startObject("field1")
                .field("type", "keyword")
                .endObject()
                .startObject("field2")
                .field("type", "text")
                .endObject()
                .endObject()
                .endObject()
                .endObject()
                .endObject()
        );
        mapperService.merge(MapperService.SINGLE_MAPPING_NAME, new CompressedXContent(mapping), MergeReason.INDEX_TEMPLATE);

        String update = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject("properties")
                .startObject("object")
                .startObject("properties")
                .startObject("field2")
                .field("type", "integer")
                .endObject()
                .startObject("field3")
                .field("type", "text")
                .endObject()
                .endObject()
                .endObject()
                .endObject()
                .endObject()
        );
        DocumentMapper mapper = mapperService.merge(
            MapperService.SINGLE_MAPPING_NAME,
            new CompressedXContent(update),
            MergeReason.INDEX_TEMPLATE
        );

        String expected = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject(MapperService.SINGLE_MAPPING_NAME)
                .startObject("properties")
                .startObject("object")
                .startObject("properties")
                .startObject("field1")
                .field("type", "keyword")
                .endObject()
                .startObject("field2")
                .field("type", "integer")
                .endObject()
                .startObject("field3")
                .field("type", "text")
                .endObject()
                .endObject()
                .endObject()
                .endObject()
                .endObject()
                .endObject()
        );

        assertEquals(expected, mapper.mappingSource().toString());
    }

    public void testDisallowFieldReplacementForIndexTemplates() throws IOException {
        MapperService mapperService = createIndex("test").mapperService();
        String mapping = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject("properties")
                .startObject("object")
                .startObject("properties")
                .startObject("field1")
                .field("type", "object")
                .endObject()
                .startObject("field2")
                .field("type", "text")
                .endObject()
                .endObject()
                .endObject()
                .endObject()
                .endObject()
        );
        mapperService.merge(MapperService.SINGLE_MAPPING_NAME, new CompressedXContent(mapping), MergeReason.INDEX_TEMPLATE);

        String firstUpdate = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject("properties")
                .startObject("object")
                .startObject("properties")
                .startObject("field2")
                .field("type", "nested")
                .endObject()
                .endObject()
                .endObject()
                .endObject()
                .endObject()
        );
        IllegalArgumentException e = expectThrows(
            IllegalArgumentException.class,
            () -> mapperService.merge(MapperService.SINGLE_MAPPING_NAME, new CompressedXContent(firstUpdate), MergeReason.INDEX_TEMPLATE)
        );
        assertThat(e.getMessage(), containsString("can't merge a non object mapping [object.field2] with an object mapping"));

        String secondUpdate = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject("properties")
                .startObject("object")
                .startObject("properties")
                .startObject("field1")
                .field("type", "text")
                .endObject()
                .endObject()
                .endObject()
                .endObject()
                .endObject()
        );
        e = expectThrows(
            IllegalArgumentException.class,
            () -> mapperService.merge(MapperService.SINGLE_MAPPING_NAME, new CompressedXContent(secondUpdate), MergeReason.INDEX_TEMPLATE)
        );
        assertThat(e.getMessage(), containsString("can't merge a non object mapping [object.field1] with an object mapping"));
    }

    public void testEmptyName() throws Exception {
        String mapping = Strings.toString(
            XContentFactory.jsonBuilder()
                .startObject()
                .startObject("")
                .startObject("properties")
                .startObject("name")
                .field("type", "text")
                .endObject()
                .endObject()
                .endObject()
                .endObject()
        );

        // Empty name not allowed in index created after 5.0
        IllegalArgumentException e = expectThrows(IllegalArgumentException.class, () -> {
            createIndex("test").mapperService().documentMapperParser().parse("", new CompressedXContent(mapping));
        });
        assertThat(e.getMessage(), containsString("name cannot be empty string"));
    }

    @Override
    protected Collection<Class<? extends Plugin>> getPlugins() {
        return pluginList(InternalSettingsPlugin.class);
    }
}