/*
 * eGov suite of products aim to improve the internal efficiency,transparency,
 *    accountability and the service delivery of the government  organizations.
 *
 *     Copyright (C) <2015>  eGovernments Foundation
 *
 *     The updated version of eGov suite of products as by eGovernments Foundation
 *     is available at http://www.egovernments.org
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program. If not, see http://www.gnu.org/licenses/ or
 *     http://www.gnu.org/licenses/gpl.html .
 *
 *     In addition to the terms of the GPL license to be adhered to in using this
 *     program, the following additional terms are to be complied with:
 *
 *         1) All versions of this program, verbatim or modified must carry this
 *            Legal Notice.
 *
 *         2) Any misrepresentation of the origin of the material is prohibited. It
 *            is required that all modified versions of this material be marked in
 *            reasonable ways as different from the original version.
 *
 *         3) This license does not grant any rights to any user of the program
 *            with regards to rights under trademark law for use of the trade names
 *            or trademarks of eGovernments Foundation.
 *
 *   In case of any queries, you can reach eGovernments Foundation at contact@egovernments.org.
 */

package org.egov.infstr.search;

import org.egov.infstr.services.Page;
import org.egov.infstr.services.PersistenceService;
import org.hibernate.Query;

import java.math.BigInteger;
import java.util.List;

/**
 * Class representing a search query. Stores the query and list of parameters. This can be used to represent SQL queries with a full query string and optional parameters.
 * @author manoranjan
 */
public class SearchQuerySQL implements SearchQuery {
	private final String searchQuery;
	private final String countQuery;
	private Object[] params = new Object[0];

	/**
	 * Creates a search query object using the given query and parameters
	 * @param searchQuery The SQL search query
	 * @param countQuery The SQL query which will return the number of records that will be returned by the search query
	 * @param params List of parameters to be passed to the query
	 */
	public SearchQuerySQL(final String searchQuery, final String countQuery, final List<Object> params) {
		this.searchQuery = searchQuery;
		this.countQuery = countQuery;
		if (params != null) {
			this.params = params.toArray();
		}
	}

	/*
	 * (non-Javadoc)
	 * @see org.egov.infstr.search.SearchQuery#getCount(org.egov.infstr.services.PersistenceService)
	 */
	@Override
	public int getCount(final PersistenceService persistenceService) {
		final Query q = getSQLQueryWithParams(persistenceService, this.countQuery);
		return ((BigInteger) q.uniqueResult()).intValue();
	}

	/*
	 * (non-Javadoc)
	 * @see org.egov.infstr.search.SearchQuery#getPage(org.egov.infstr.services.PersistenceService, int, int)
	 */
	@Override
	public Page getPage(final PersistenceService persistenceService, final int pageNum, final int pageSize) {
		final Query q = getSQLQueryWithParams(persistenceService, this.searchQuery);
		return new Page(q, pageNum, pageSize);
	}

	/**
	 * Creates an SQL query and also sets parameters in to it if required
	 * @param persistenceService Persistence service used for creating the query
	 * @param query The SQL query string
	 * @return The created Query object
	 */
	private Query getSQLQueryWithParams(final PersistenceService persistenceService, final String query) {
		final Query q = persistenceService.getSession().createSQLQuery(query);

		if (this.params != null && this.params.length > 0) {
			for (int index = 0; index < this.params.length; index++) {
				q.setParameter(index, this.params[index]);
			}
		}
		return q;
	}
}