<?php
/**
 * eGgroupWare setup - test or create the database
 *
 * @link http://www.egroupware.org
 * @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
 * @package setup
 * @copyright (c) 2007 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @version $Id$ 
 */

/**
 * setup command: test or create the database
 */
class setup_cmd_database extends setup_cmd 
{
	/**
	 * Instance of egw_db to connect or create the db
	 *
	 * @var egw_db
	 */
	private $test_db;
	
	/**
	 * Enter description here...
	 *
	 * @param string/array $domain domain-name to customize the defaults or array with all parameters
	 * @param string $db_type db-type (mysql, pgsql, ...)
	 * @param string $db_host=null
	 * @param string $db_port=null
	 * @param string $db_name=null
	 * @param string $db_user=null
	 * @param string $db_pass=null
	 * @param string $db_root=null
	 * @param string $db_root_pw=null
	 * @param string $sub_command='create_db' 'create_db', 'test_db', 'test_db_root'
	 */
	function __construct($domain,$db_type=null,$db_host=null,$db_port=null,$db_name=null,$db_user=null,$db_pass=null,
		$db_root=null,$db_root_pw=null,$sub_command='create_db')
	{
		if (!is_array($domain))
		{
			$domain = array(
				'domain'  => $domain,
				'db_type' => $db_type,
				'db_host' => $db_host,
				'db_port' => $db_port,
				'db_name' => $db_name,
				'db_user' => $db_user,
				'db_pass' => $db_pass,
				'db_root' => $db_root,
				'db_root_pw' => $db_root_pw,
				'sub_command' => $sub_command
			);
		}
		//echo __CLASS__.'::__construct()'; _debug_array($domain);
		admin_cmd::__construct($domain);
	}

	/**
	 * test or create database
	 * 
	 * @param boolean $check_only=false only run the checks (and throw the exceptions), but not the command itself
	 * @return string serialized $GLOBALS defined in the header.inc.php
	 * @throws Exception(lang('Wrong credentials to access the header.inc.php file!'),2);
	 * @throws Exception('header.inc.php not found!');
	 */
	protected function exec($check_only=false)
	{
		if (!empty($this->domain) && !preg_match('/^([a-z0-9_-]+\.)*[a-z0-9]+/i',$this->domain))
		{
			throw new egw_exception_wrong_userinput(lang("'%1' is no valid domain name!",$this->domain));
		}
		if ($this->remote_id && $check_only) return true;	// further checks can only done locally
		
		$this->_merge_defaults();
		//_debug_array($this->as_array());

		try {
			switch($this->sub_command)
			{
				case 'test_db_root':
					$msg = $this->connect($this->db_root,$this->db_root_pw,$this->db_meta);
					break;
				case 'test_db':
					$msg = $this->connect();
					break;
				case 'create_db':
				default:
					$msg = $this->create();
					break;
			}
		}
		catch (Exception $e) {
			// we catch the exception to properly restore the db
		}
		$this->restore_db();
		
		if ($e)
		{
			throw $e;
		}
		return $msg;
	}
	
	/**
	 * Connect to database
	 *
	 * @param string $user=null default $this->db_user
	 * @param string $pass=null default $this->db_pass
	 * @param string $name=null default $this->db_name
	 * @throws egw_exception_wrong_userinput Can not connect to database ...
	 */
	private function connect($user=null,$pass=null,$name=null)
	{
		if (is_null($user)) $user = $this->db_user;
		if (is_null($pass)) $pass = $this->db_pass;
		if (is_null($name)) $name = $this->db_name;

		$this->test_db = new egw_db();
		
		$error_rep = error_reporting();
		error_reporting($error_rep & ~E_WARNING);	// switch warnings of, in case they are on
		try {
			$this->test_db->connect($name,$this->db_host,$this->db_port,$user,$pass,$this->db_type);
		}
		catch (Exception $e) {
			// just give a nicer error, after switching error_reporting on again
		}
		error_reporting($error_rep);
		
		if ($e)
		{
			throw new egw_exception_wrong_userinput(lang('Can not connect to %1 database %2 on host %3 using user %4!',
				$this->db_type,$name,$this->db_host.($this->db_port?':'.$this->db_port:''),$user).' ('.$e->getMessage().')');
		}
		return lang('Successful connected to %1 database %2 on %3 using user %4.',
				$this->db_type,$name,$this->db_host.($this->db_port?':'.$this->db_port:''),$user);
	}
	
	/**
	 * Check and if does not yet exist create the new database and user
	 *
	 * The check will fail if the database exists, but already contains tables
	 * 
	 * @return string with success message
	 * @throws egw_exception_wrong_userinput
	 */
	private function create()
	{
		try {
			$msg = $this->connect();
		}
		catch (egw_exception_wrong_userinput $e) {
			// db or user not working --> connect as root and create it
			if (!$this->test_db->create_database($this->db_root,$this->db_root_pw,$this->db_charset))
			{
				// try connect as root to check if that's the problem
				$this->connect($this->db_root,$this->db_root_pw,$this->db_meta);
				// if not give general error
				throw new egw_exception_wrong_userinput(lang('Can not create %1 database %2 on %3 for user %4!',
					$this->db_type,$this->db_name,$this->db_host.($this->db_port?':'.$this->db_port:''),$this->db_user));
			}
			$msg = lang('Successful connected to %1 on %3 and created database %2 for user %4.',
					$this->db_type,$this->db_name,$this->db_host.($this->db_port?':'.$this->db_port:''),$this->db_user);
		}
		// check if it already contains tables
		if (($tables = $this->test_db->table_names()))
		{
			foreach($tables as &$table)
			{
				$table = $table['table_name'];
			}
			throw new egw_exception_wrong_userinput(lang('%1 database %2 on %3 already contains the following tables:',
				$this->db_type,$this->db_name,$this->db_host.($this->db_port?':'.$this->db_port:'')).' '.
				implode(', ',$tables));
		}
		return $msg;
	}
	
	/**
	 * Return default database settings for a given domain
	 *
	 * @param string $db_type='mysql'
	 * @return array
	 */
	static function defaults($db_type='mysql')
	{
		switch($db_type)
		{
			case 'mysql':
			default:
				$db_type = $meta_db = 'mysql';
				break;
			case 'pgsql':
				$meta_db = 'template1';
				break;
		}
		return array(
			'db_type' => $db_type,
			'db_host' => 'localhost',
			'db_port' => 3306,
			'db_name' => 'egw_$domain',
			'db_user' => 'egw_$domain',
			'db_pass' => md5(microtime(true).$domain.session_id()),
			'db_root' => 'root',
			'db_root_pw' => '',	// not really a default
			'db_meta' => $meta_db,
			'db_charset' => 'utf-8',
		);
	}

	/**
	 * Merges the default into the current properties, if they are empty or contain placeholders
	 */
	private function _merge_defaults()
	{
		foreach(self::defaults($this->domain) as $name => $default)
		{
			if (!$this->$name)
			{
				//echo "<p>setting $name='{$this->$name}' to it's default='$default'</p>\n";
				$this->set_defaults[$name] = $this->$name = $default;
			}
			if (strpos($this->$name,'$domain'))
			{
				$this->$name = str_replace(array('$domain','.','-'),array($this->domain,'_','_'),$this->$name);
			}
		}
	}
}