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/*
 * Copyright © 2009 HotPads ([email protected])
 *
 * 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 io.datarouter.gcp.spanner.ddl;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import io.datarouter.model.field.Field;
import io.datarouter.scanner.Scanner;

public class SpannerIndex{

	private final String tableName;
	private final String indexName;
	private final List> keyFields;
	private final List> allFields;
	private final Boolean isUnique;

	public SpannerIndex(
			String tableName,
			String indexName,
			List> keyFields,
			List> allFields,
			Boolean isUnique){
		this.tableName = tableName;
		this.indexName = indexName;
		this.keyFields = keyFields;
		this.allFields = allFields;
		this.isUnique = isUnique;
	}

	public boolean isKeyOnlyIndex(){
		return allFields == null || allFields.isEmpty();
	}

	public String getIndexName(){
		return indexName;
	}

	public String getTableName(){
		return tableName;
	}

	public List> getKeyFields(){
		return keyFields;
	}

	public List> getAllFields(){
		return allFields;
	}

	public Boolean isUnique(){
		return isUnique;
	}

	public List> getNonKeyFields(){
		if(keyFields.size() == allFields.size()){
			return List.of();
		}
		Map> keyMap = Scanner.of(keyFields)
				.toMapSupplied(field -> field.getKey().getColumnName(), LinkedHashMap::new);
		Map> nonKeyFieldsMap = Scanner.of(allFields)
				.toMapSupplied(field -> field.getKey().getColumnName(), LinkedHashMap::new);
		keyMap.forEach((key, field) -> nonKeyFieldsMap.remove(key));
		return new ArrayList<>(nonKeyFieldsMap.values());
	}

}