package org.openslx.imagemaster.db;

import java.io.FileInputStream;
import java.io.BufferedInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.List;
import java.util.Properties;
import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import org.apache.log4j.Logger;
import org.openslx.imagemaster.util.Util;

import fi.evident.dalesbred.Database;

/**
 * Class for talking to the DB via the dalesbred jdbc wrapper. Package private,
 * so only the Db* classes can actually communicate with the database.
 * 
 */
class MySQL
{
	private static final Logger log = Logger.getLogger( MySQL.class );
	private static Database db = null;

	static
	{
		// Load connection info from class (TODO: Make pretty)
		Properties properties = new Properties();
		try {
			final BufferedInputStream stream = new BufferedInputStream( new FileInputStream( "config/mysql.properties" ) );
			properties.load( stream );
			stream.close();
		} catch ( FileNotFoundException e ) {
			log.fatal( "config/mysql.properties not found!" );
			System.exit( 1 );
		} catch ( IOException e ) {
			log.fatal( "Error reading from config/mysql.properties: " + e.getMessage() );
			System.exit( 1 );
		} catch ( Exception e ) {
			log.fatal( "Generic error loading mysql properties file." );
			e.printStackTrace();
			System.exit( 1 );
		}
		final String host = properties.getProperty( "host" );
		final String dbname = properties.getProperty( "db" );
		final String user = properties.getProperty( "user" );
		final String password = properties.getProperty( "password" );
		
		Util.notNullFatal( host, "host not set in mysql properties" );
		Util.notNullFatal( dbname, "db not set in mysql properties" );
		Util.notNullFatal( user, "user not set in mysql properties" );
		Util.notNullFatal( password, "password not set in mysql properties" );

		// Setup db connection
		try {
			MysqlDataSource ds = new MysqlDataSource();
			ds.setServerName( host );
			ds.setDatabaseName( dbname );
			ds.setUser( user );
			ds.setPassword( password );
			db = Database.forDataSource( ds );
		} catch ( Exception e ) {
			log.fatal( "Error initializing mysql data source!" );
			e.printStackTrace();
			System.exit( 1 );
		}
	}

	protected static <T> List<T> findAll( final Class<T> clazz, final String sql, final Object... args )
	{
		return db.findAll( clazz, sql, args );
	}

	protected static <T> T findUniqueOrNull( final Class<T> clazz, final String sql, final Object... args )
	{
		return db.findUniqueOrNull( clazz, sql, args );
	}
	
	protected static int update(String query, Object... args) {
		return db.update(query, args);
	}
}