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/*
 * Copyright 2016 the original author or authors.
 *
 * 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.github.drinkjava2.jdialects.id;

import com.github.drinkjava2.jdbpro.NormalJdbcTool;
import com.github.drinkjava2.jdialects.Dialect;
import com.github.drinkjava2.jdialects.Type;
import com.github.drinkjava2.jdialects.annotation.jpa.GenerationType;

/**
 * AutoGenerator will depends database's id generator mechanism like MySql's
 * Identity, Oracle's Sequence...
 * 
 * @author Yong Zhu
 * @version 1.0.0
 * @since 1.0.0
 */
public class AutoIdGenerator implements IdGenerator {
	private static final String JDIALECTS_AUTOID_NAME = "jdia_autoid";
	private static final String JDIALECTS_AUTOID_TABLE = "jdia_table_autoid";
	private static final String JDIALECTS_AUTOID_SEQUENCE = "jdia_seq_autoid";

	public static final AutoIdGenerator INSTANCE = new AutoIdGenerator();

	public static final TableIdGenerator TABLE_AUTOID_INSTANCE = new TableIdGenerator(JDIALECTS_AUTOID_NAME,
			JDIALECTS_AUTOID_TABLE, "idcolumn", "valuecolumn", "next_val", 1, 50);

	public static final SequenceIdGenerator SEQ_AUTOID_INSTANCE = new SequenceIdGenerator(JDIALECTS_AUTOID_NAME,
			JDIALECTS_AUTOID_SEQUENCE, 1, 1);

	@Override
	public GenerationType getGenerationType() {
		return GenerationType.AUTO;
	}

	@Override
	public String getIdGenName() {
		return JDIALECTS_AUTOID_NAME;
	}

	@Override
	public IdGenerator newCopy() {
		return INSTANCE;
	}
	
	@Override
	public Boolean dependOnAutoIdGenerator() {
		return true;
	}

	@Override
	public Object getNextID(NormalJdbcTool jdbc, Dialect dialect, Type dataType) {
		if (dialect.getDdlFeatures().supportBasicOrPooledSequence())
			return SEQ_AUTOID_INSTANCE.getNextID(jdbc, dialect, dataType);
		else
			return TABLE_AUTOID_INSTANCE.getNextID(jdbc, dialect, dataType);
	}

	/**
	 * If dialect support sequence, return a SequenceIdGenerator, otherwise return a
	 * TableIdGenerator
	 */
	public IdGenerator getSequenceOrTableIdGenerator(Dialect dialect) {
		if (dialect.getDdlFeatures().supportBasicOrPooledSequence())
			return SEQ_AUTOID_INSTANCE;
		else
			return TABLE_AUTOID_INSTANCE;
	}
}