/*
 * This file is a part of EpnTAPClient.
 * This program aims to provide EPN-TAP support for software clients, like CASSIS spectrum analyzer.
 * See draft specifications: https://voparis-confluence.obspm.fr/pages/viewpage.action?pageId=559861
 * Copyright (C) 2016 Institut de Recherche en Astrophysique et Planétologie.
 * 
 * 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 (at your option) 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/>.
 */

package eu.omp.irap.vespa.epntapclient.utils;

import java.util.Map;
import java.util.StringJoiner;

/**
 * @author N. Jourdane
 */
public final class Queries {

	/** Query to get all EPN-TAP services. */
	public static final String GET_EPN_TAP_SERVICES = "SELECT short_name, "
			+ "res_title AS schema_title, table_name, schema_name, ivoid, access_url "
			+ "FROM rr.resource NATURAL JOIN rr.res_schema NATURAL JOIN rr.res_table "
			+ "NATURAL JOIN rr.interface NATURAL JOIN rr.res_detail NATURAL JOIN rr.capability "
			+ "WHERE standard_id='ivo://ivoa.net/std/tap' AND "
			+ "intf_type='vs:paramhttp' AND "
			+ "detail_xpath='/capability/dataModel/@ivo-id' AND "
			+ "1=ivo_nocasematch(detail_value, 'ivo://vopdc.obspm/std/EpnCore%') "
			+ "ORDER BY short_name, table_name";

	/**
	 * The default query, with these parameters, respectively: max_rows, target_name, time_min,
	 * time_max, dataproduct_type, spectral_range_min, spectral_range_max.
	 * 
	 * @param nbRow The maximum number of rows returned.
	 * @param tableName The name of the target table for the query.
	 * @param params A map of parameters, for the `WHERE` keywords.
	 * @return The literal string of the query.
	 */
	public static String getQuery(String tableName, Map<String, Object> params, int nbRow) {
		StringJoiner join = new StringJoiner(" AND ");
		for (Map.Entry<String, Object> e : params.entrySet()) {
			Class paramClass = e.getValue().getClass();
			if (paramClass == String.class && !"".equals(e.getValue())) {
				join.add(e.getKey() + " LIKE '%" + e.getValue() + "%'");
			} else if ((paramClass == Float.class && ((Float) e.getValue()) == new Float(0)) ||
					(paramClass == Integer.class && ((Integer) e.getValue()) == new Integer(0))) {
				join.add(e.getKey() + " = " + e.getValue().toString());
			}
		}
		String where = "".equals(join.toString()) ? "" : " WHERE " + join.toString();
		return "SELECT TOP " + nbRow + " target_name, target_class FROM " + tableName + where;
	}

	/** Constructor to hide the implicit public one. */
	private Queries() {
	}

}