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/*******************************************************************************
 * Copyright 2018 Viridian Software Limited
 *
 * Licensed 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.
 ******************************************************************************/
package com.elefana.indices;

import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;

import com.elefana.api.indices.IndexTemplate;
import com.elefana.es.compat.date.FormatDateTimeFormatter;
import com.elefana.es.compat.date.JodaUtils;

public abstract class FieldMapper {
	public static final FormatDateTimeFormatter DEFAULT_DATE_TIME_FORMATTER = JodaUtils.forPattern(
            "strict_date_optional_time||epoch_millis", Locale.ROOT);
	
	public static final FormatDateTimeFormatter EPOCH_DATE_TIME_FORMATTER = JodaUtils.forPattern(
            "epoch_millis", Locale.ROOT);

	public abstract Map getEmptyMapping();
	
	public abstract List getFieldNamesFromMapping(Map mappings);

	public void generateFieldNames(Set existingFieldNames, Map document) {
		generateFieldNames(existingFieldNames, "", document);
	}

	private void generateFieldNames(Set existingFieldNames, String prefix, Map document) {
		for(String key : document.keySet()) {
			generateFieldNameForValue(existingFieldNames, prefix + key, document.get(key));
		}
	}

	private void generateFieldNameForValue(Set existingFieldNames, String key, Object value) {
		if(value instanceof Map) {
			generateFieldNames(existingFieldNames, key + ".", (Map) value);
		} else if(value instanceof List) {
			final List valueList = (List) value;
			for(int i = 0; i < valueList.size(); i++) {
				generateFieldNameForValue(existingFieldNames, key + "[" + i + "]", valueList.get(i));
			}
		} else {
			existingFieldNames.add(key);
		}
	}
	
	public abstract Map convertIndexTemplateToMappings(IndexTemplate indexTemplate, String type);
	
	public abstract void generateMappings(Map existingMapping, Map document);
	
	public abstract void mergeMapping(Map existingMappingForField, String fieldName, Map newMappingForField);
}