/*

  *   SONEWS News Server

  *   see AUTHORS for the list of contributors

  *

  *   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 org.sonews.util;

 import java.io.BufferedReader;

 import java.io.InputStreamReader;

 import java.sql.Connection;

 import java.sql.DriverManager;

 import java.sql.SQLException;

 import java.sql.Statement;

 import java.util.HashMap;

 import java.util.Map;

 import org.sonews.util.io.Resource;

 /**

  * Database setup utility class.

  * @author Christian Lins

  * @since sonews/0.5.0

  */

 public final class DatabaseSetup {

 	private static final Map<String, String> templateMap = new HashMap<String, String>();

 	private static final Map<String, StringTemplate> urlMap = new HashMap<String, StringTemplate>();

 	private static final Map<String, String> driverMap = new HashMap<String, String>();

 	static {

 		templateMap.put("1", "helpers/database_mysql5_tmpl.sql");

 		templateMap.put("2", "helpers/database_postgresql8_tmpl.sql");

 		templateMap.put("3", "helpers/database_hsqldb_tmpl.sql");

 		urlMap.put("1", new StringTemplate("jdbc:mysql://%HOSTNAME/%DB"));

 		urlMap.put("2", new StringTemplate("jdbc:postgresql://%HOSTNAME/%DB"));

 		driverMap.put("1", "com.mysql.jdbc.Driver");

 		driverMap.put("2", "org.postgresql.Driver");

 		driverMap.put("3", "org.hsqldb.jdbcDriver");

 	}

 	public static void main(String[] args)

 			throws Exception {

 		loadJDBCDriver();

 		if (args.length == 0) {

 			System.out.println("sonews Database setup helper");

 			System.out.println("This program will create a initial database table structure");

 			System.out.println("for the sonews Newsserver.");

 			System.out.println("You need to create a database and a db user manually before!");

 			System.out.println("Select DBMS type:");

 			System.out.println("[1] MySQL 5.x or higher");

 			System.out.println("[2] PostgreSQL 8.x or higher");

 			System.out.print("Your choice: ");

 			BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

 			String dbmsType = in.readLine();

 			String tmplName = templateMap.get(dbmsType);

 			if (tmplName == null) {

 				System.err.println("Invalid choice. Try again you fool!");

 				main(args);

 				return;

 			}

 			String tmpl = Resource.getAsString(tmplName, true);

 			System.out.print("Database server hostname (e.g. localhost): ");

 			String dbHostname = in.readLine();

 			System.out.print("Database name: ");

 			String dbName = in.readLine();

 			System.out.print("Give name of DB user that can create tables: ");

 			String dbUser = in.readLine();

 			System.out.print("Password: ");

 			String dbPassword = in.readLine();

 			String url = urlMap.get(dbmsType).set("HOSTNAME", dbHostname).set("DB", dbName).toString();

 			createTables(tmpl, url, dbUser, dbPassword);

 			// TODO: Create config file

 		} else if(args.length == 4) {

 			String tmplName = args[0];

 			String url = args[1];

 			String dbUser = args[2];

 			String dbPassword = args[3];

 			String tmpl = Resource.getAsString(tmplName, true);

 			createTables(tmpl, url, dbUser, dbPassword);

 		} else {

 			System.out.println("Wrong number of parameters!");

 		}

 		System.out.println("Ok");

 	}

 	public static void createTables(String tmpl, String url, String dbUser, String dbPassword)

 			throws SQLException {

 		Connection conn =

 				DriverManager.getConnection(url, dbUser, dbPassword);

 		String[] tmplChunks = tmpl.split(";");

 		for (String chunk : tmplChunks) {

 			if (chunk.trim().equals("")) {

 				continue;

 			}

 			Statement stmt = conn.createStatement();

 			stmt.execute(chunk);

 		}

 		conn.commit();

 		conn.close();

 	}

 	public static void loadJDBCDriver() {

 		for(String className : driverMap.values()) {

 			try {

 				Class.forName(className);

 			} catch (ClassNotFoundException ex) {

 				System.out.println("Could not load JDBC driver: " + className);

 			}

 		}

 	}

 }