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/*******************************************************************************
 * Copyright 2016 Francesco Cina'
 *
 * 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.jporm.rx.query.find;

import java.util.List;
import java.util.Optional;

import com.jporm.commons.core.exception.JpoNotUniqueResultException;
import com.jporm.persistor.generator.Persistor;
import com.jporm.sql.query.select.SelectCommon;

import io.reactivex.Observable;
import io.reactivex.Single;

public interface FindQueryExecutionProvider extends SelectCommon {

	/**
	 * Return whether a bean exists with the specified id(s)
	 *
	 * @return
	 */
	default Single exist() {
		return fetchRowCount().map(count -> count > 0);
	}

	/**
	 * Execute the query returning the list of beans.
	 *
	 * @return
	 */
	default Observable fetchAll() {
		final ExecutionEnvProvider env = getExecutionEnvProvider();
		final Persistor persistor = env.getOrmClassTool().getPersistor();
		final List ignoredFields = env.getIgnoredFields();
		return env.getSqlExecutor().query(sqlQuery(), sqlValues(), (rowEntry, count) -> {
			return persistor.beanFromResultSet(rowEntry, ignoredFields);
		});
	}

	/**
	 * Fetch the bean
	 *
	 * @return
	 */
	default Single> fetchOneOptional() {
		final ExecutionEnvProvider env = getExecutionEnvProvider();
		return env.getSqlExecutor().queryForOptional(sqlQuery(), sqlValues(), (rowEntry, count) -> {
			final List ignoredFields = env.getIgnoredFields();
			final Persistor persistor = env.getOrmClassTool().getPersistor();
			return persistor.beanFromResultSet(rowEntry, ignoredFields);
		});
	}

	/**
	 * Fetch the bean. An {@link JpoNotUniqueResultException} is thrown if the
	 * result is not unique.
	 *
	 * @return
	 */
	default Single fetchOneUnique() {
		final ExecutionEnvProvider env = getExecutionEnvProvider();
		return env.getSqlExecutor().queryForUnique(sqlQuery(), sqlValues(), (rowEntry, count) -> {
			final List ignoredFields = env.getIgnoredFields();
			final Persistor persistor = env.getOrmClassTool().getPersistor();
			return persistor.beanFromResultSet(rowEntry, ignoredFields);
		});
	}

	/**
	 * Return the count of entities this query should return.
	 *
	 * @return
	 */
	default Single fetchRowCount() {
		return getExecutionEnvProvider().getSqlExecutor().queryForIntUnique(sqlRowCountQuery(), sqlValues());
	}

	ExecutionEnvProvider getExecutionEnvProvider();

}