/*

 * 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.ArrayList;
import java.util.List;

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

/**
 * @author N. Jourdane
 */

public final class Queries {

	// AMDA access_url: http://cdpp-epntap.cesr.fr/__system__/tap/run/tap
	// AMDA table name: amdadb.epn_core

	/** 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 addJoin = new StringJoiner(" AND ");

		for (Map.Entry<String, Object> param : params.entrySet()) {

			Class paramClass = param.getValue().getClass();
			if (paramClass == ArrayList.class) {
				StringJoiner orJoin = new StringJoiner(" OR ");
				List<String> possibleValues = ((List<String>) param.getValue());
				for (String possibleValue : possibleValues)
					orJoin.add(param.getKey() + " LIKE '" + possibleValue + "'");
				addJoin.add("(" + orJoin.toString() + ")");
			} else if (paramClass == String.class) {
				addJoin.add(param.getKey() + " LIKE '" + param.getValue() + "'");

			} else {

				addJoin.add(param.getKey() + " = " + param.getValue().toString());

			}
		}

		String where = "".equals(addJoin.toString()) ? "" : " WHERE " + addJoin.toString();

		return "SELECT TOP " + nbRow + " target_name, target_class FROM " + tableName + where;
	}

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

}