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 * SPDX-License-Identifier: Apache-2.0
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 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 *
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */
 
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 * 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
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package org.opensearch.hadoop.serialization;

import java.util.LinkedHashMap;
import java.util.Map;

import org.apache.hadoop.io.MapWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.opensearch.hadoop.serialization.bulk.RawJson;
import org.opensearch.hadoop.serialization.field.ConstantFieldExtractor;
import org.opensearch.hadoop.serialization.field.FieldExtractor;
import org.opensearch.hadoop.serialization.field.MapWritableFieldExtractor;
import org.opensearch.hadoop.util.TestSettings;
import org.junit.Test;

import static org.junit.Assert.*;

public class FieldExtractorTests {

    private Object extract(ConstantFieldExtractor extractor, String field, Object target) {
        TestSettings cfg = new TestSettings();
        cfg.setProperty(ConstantFieldExtractor.PROPERTY, field);

        extractor.setSettings(cfg);
        return extractor.field(target);
    }

    @Test
    public void testConstantFieldExtractorWithString() throws Exception {
        ConstantFieldExtractor cfe = new ConstantFieldExtractor();
        assertEquals(new RawJson("\"fixed\""), extract(cfe, "<fixed>", new Object()));
    }

    @Test
    public void testConstantFieldExtractorWithNumber() throws Exception {
        ConstantFieldExtractor cfe = new ConstantFieldExtractor();
        assertEquals(new RawJson("123"), extract(cfe, "<123>", new Object()));
    }

    @Test
    public void testConstantFieldExtractorNotFound() throws Exception {
        ConstantFieldExtractor cfe = new ConstantFieldExtractor();
        assertEquals(FieldExtractor.NOT_FOUND, extract(cfe, "non-existing", new Object()));
    }

    @Test
    public void testMapFieldExtractorTopLevel() throws Exception {
        ConstantFieldExtractor cfe = new MapFieldExtractor();
        Map<String, String> m = new LinkedHashMap<String, String>();
        m.put("key", "value");
        assertEquals("value", extract(cfe, "key", m));
    }

    @Test
    public void testMapFieldExtractorNestedNotFound() throws Exception {
        ConstantFieldExtractor cfe = new MapFieldExtractor();
        Map<String, String> m = new LinkedHashMap<String, String>();
        assertEquals(FieldExtractor.NOT_FOUND, extract(cfe, "key", m));
    }

    @Test
    public void testMapWritableFieldExtractorNested() throws Exception {
        ConstantFieldExtractor cfe = new MapFieldExtractor();
        Map<String, Object> m = new LinkedHashMap<String, Object>();
        Map<String, String> nested = new LinkedHashMap<String, String>();
        nested.put("bar", "found");
        m.put("foo", nested);
        assertEquals("found", extract(cfe, "foo.bar", m));
    }

    @Test
    public void testMapWritableFieldExtractorTopLevel() throws Exception {
        ConstantFieldExtractor cfe = new MapWritableFieldExtractor();
        Map<Writable, Writable> m = new MapWritable();
        m.put(new Text("key"), new Text("value"));
        assertEquals(new Text("value"), extract(cfe, "key", m));
    }

    @Test
    public void testMapWritableFieldExtractorNestedNotFound() throws Exception {
        ConstantFieldExtractor cfe = new MapWritableFieldExtractor();
        Map<Writable, Writable> m = new MapWritable();
        assertEquals(FieldExtractor.NOT_FOUND, extract(cfe, "key", m));
    }

    @Test
    public void testMapFieldExtractorNested() throws Exception {
        ConstantFieldExtractor cfe = new MapWritableFieldExtractor();
        Map<Writable, Writable> m = new MapWritable();
        MapWritable nested = new MapWritable();
        nested.put(new Text("bar"), new Text("found"));
        m.put(new Text("foo"), nested);
        assertEquals(new Text("found"), extract(cfe, "foo.bar", m));
    }
}