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<?php
/**
 * @package     Joomla.Installation
 * @subpackage  Model
 *
 * @copyright   (C) 2009 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Installation\Model;

\defined('_JEXEC') or die;

use Joomla\CMS\Factory;
use Joomla\CMS\Installation\Helper\DatabaseHelper;
use Joomla\CMS\Language\LanguageHelper;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Object\CMSObject;
use Joomla\Database\DatabaseDriver;
use Joomla\Database\DatabaseInterface;
use Joomla\Utilities\ArrayHelper;

/**
 * Database configuration model for the Joomla Core Installer.
 *
 * @since  3.1
 */
class DatabaseModel extends BaseInstallationModel
{
	/**
	 * Get the current setup options from the session.
	 *
	 * @return  array  An array of options from the session.
	 *
	 * @since   4.0.0
	 */
	public function getOptions()
	{
		return Factory::getSession()->get('setup.options', array());
	}

/**
	 * Method to initialise the database.
	 *
	 * @param   boolean  $select  Select the database when creating the connections.
	 *
	 * @return  DatabaseInterface|boolean  Database object on success, boolean false on failure
	 *
	 * @since   3.1
	 */
	public function initialise($select = true)
	{
		$options = $this->getOptions();

// Get the options as an object for easier handling.
		$options = ArrayHelper::toObject($options);

// Load the backend language files so that the DB error messages work.
		$lang = Factory::getLanguage();
		$currentLang = $lang->getTag();

// Load the selected language
		if (LanguageHelper::exists($currentLang, JPATH_ADMINISTRATOR))
		{
			$lang->load('joomla', JPATH_ADMINISTRATOR, $currentLang, true);
		}
		// Pre-load en-GB in case the chosen language files do not exist.
		else
		{
			$lang->load('joomla', JPATH_ADMINISTRATOR, 'en-GB', true);
		}

// Validate and clean up connection parameters
		$paramsCheck = DatabaseHelper::validateConnectionParameters($options);

if ($paramsCheck)
		{
			Factory::getApplication()->enqueueMessage($paramsCheck, 'warning');

return false;
		}

// Security check for remote db hosts
		if (!DatabaseHelper::checkRemoteDbHost($options))
		{
			// Messages have been enqueued in the called function.
			return false;
		}

// Get a database object.
		try
		{
			return DatabaseHelper::getDbo(
				$options->db_type,
				$options->db_host,
				$options->db_user,
				$options->db_pass_plain,
				$options->db_name,
				$options->db_prefix,
				$select,
				DatabaseHelper::getEncryptionSettings($options)
			);
		}
		catch (\RuntimeException $e)
		{
			Factory::getApplication()->enqueueMessage(Text::sprintf('INSTL_DATABASE_COULD_NOT_CONNECT', $e->getMessage()), 'error');

return false;
		}
	}

/**
	 * Method to create a new database.
	 *
	 * @return  boolean
	 *
	 * @since   3.1
	 * @throws  \RuntimeException
	 */
	public function createDatabase()
	{
		$options = (object) $this->getOptions();

$db = $this->initialise(false);

if ($db === false)
		{
			// Error messages are enqueued by the initialise function, we just need to tell the controller how to redirect
			return false;
		}

// Check database version.
		$type = $options->db_type;

try
		{
			$db_version = $db->getVersion();
		}
		catch (\RuntimeException $e)
		{
			/*
			 * We may get here if the database doesn't exist, if so then explain that to users instead of showing the database connector's error
			 * This only supports PDO PostgreSQL and the PDO MySQL drivers presently
			 *
			 * Error Messages:
			 * PDO MySQL: [1049] Unknown database 'database_name'
			 * PDO PostgreSQL: database "database_name" does not exist
			 */
			if ($type === 'mysql' && strpos($e->getMessage(), '[1049] Unknown database') === 42
				|| $type === 'pgsql' && strpos($e->getMessage(), 'database "' . $options->db_name . '" does not exist'))
			{
				/*
				 * Now we're really getting insane here; we're going to try building a new JDatabaseDriver instance
				 * in order to trick the connection into creating the database
				 */
				if ($type === 'mysql')
				{
					// MySQL (PDO): Don't specify database name
					$altDBoptions = array(
						'driver'   => $options->db_type,
						'host'     => $options->db_host,
						'user'     => $options->db_user,
						'password' => $options->db_pass_plain,
						'prefix'   => $options->db_prefix,
						'select'   => false,
						DatabaseHelper::getEncryptionSettings($options),
					);
				}
				else
				{
					// PostgreSQL (PDO): Use 'postgres'
					$altDBoptions = array(
						'driver'   => $options->db_type,
						'host'     => $options->db_host,
						'user'     => $options->db_user,
						'password' => $options->db_pass_plain,
						'database' => 'postgres',
						'prefix'   => $options->db_prefix,
						'select'   => false,
						DatabaseHelper::getEncryptionSettings($options),
					);
				}

$altDB = DatabaseDriver::getInstance($altDBoptions);

// Check database server parameters
				$dbServerCheck = DatabaseHelper::checkDbServerParameters($altDB, $options);

if ($dbServerCheck)
				{
					// Some server parameter is not ok
					throw new \RuntimeException($dbServerCheck, 500, $e);
				}

// Try to create the database now using the alternate driver
				try
				{
					$this->createDb($altDB, $options, $altDB->hasUtfSupport());
				}
				catch (\RuntimeException $e)
				{
					// We did everything we could
					throw new \RuntimeException(Text::_('INSTL_DATABASE_COULD_NOT_CREATE_DATABASE'), 500, $e);
				}

// If we got here, the database should have been successfully created, now try one more time to get the version
				try
				{
					$db_version = $db->getVersion();
				}
				catch (\RuntimeException $e)
				{
					// We did everything we could
					throw new \RuntimeException(Text::sprintf('INSTL_DATABASE_COULD_NOT_CONNECT', $e->getMessage()), 500, $e);
				}
			}
			// Anything getting into this part of the conditional either doesn't support manually creating the database or isn't that type of error
			else
			{
				throw new \RuntimeException(Text::sprintf('INSTL_DATABASE_COULD_NOT_CONNECT', $e->getMessage()), 500, $e);
			}
		}

// Check database server parameters
		$dbServerCheck = DatabaseHelper::checkDbServerParameters($db, $options);

if ($dbServerCheck)
		{
			// Some server parameter is not ok
			throw new \RuntimeException($dbServerCheck, 500, $e);
		}

// @internal Check for spaces in beginning or end of name.
		if (strlen(trim($options->db_name)) <> strlen($options->db_name))
		{
			throw new \RuntimeException(Text::_('INSTL_DATABASE_NAME_INVALID_SPACES'));
		}

// @internal Check for asc(00) Null in name.
		if (strpos($options->db_name, chr(00)) !== false)
		{
			throw new \RuntimeException(Text::_('INSTL_DATABASE_NAME_INVALID_CHAR'));
		}

// Get database's UTF support.
		$utfSupport = $db->hasUtfSupport();

// Try to select the database.
		try
		{
			$db->select($options->db_name);
		}
		catch (\RuntimeException $e)
		{
			// If the database could not be selected, attempt to create it and then select it.
			if (!$this->createDb($db, $options, $utfSupport))
			{
				throw new \RuntimeException(Text::sprintf('INSTL_DATABASE_ERROR_CREATE', $options->db_name), 500, $e);
			}

$db->select($options->db_name);
		}

// Set the character set to UTF-8 for pre-existing databases.
		try
		{
			$db->alterDbCharacterSet($options->db_name);
		}
		catch (\RuntimeException $e)
		{
			// Continue Anyhow
		}

$options = (array) $options;

// Remove *_errors value.
		foreach ($options as $i => $option)
		{
			if (isset($i['1']) && $i['1'] == '*')
			{
				unset($options[$i]);

break;
			}
		}

$options = array_merge(['db_created' => 1], $options);

Factory::getSession()->set('setup.options', $options);

return true;
	}

/**
	 * Method to process the old database.
	 *
	 * @return  boolean  True on success.
	 *
	 * @since   3.1
	 */
	public function handleOldDatabase()
	{
		$options = $this->getOptions();

if (!isset($options['db_created']) || !$options['db_created'])
		{
			return $this->createDatabase($options);
		}

// Get the options as an object for easier handling.
		$options = ArrayHelper::toObject($options);

if (!$db = $this->initialise())
		{
			return false;
		}

// Set the character set to UTF-8 for pre-existing databases.
		try
		{
			$db->alterDbCharacterSet($options->db_name);
		}
		catch (\RuntimeException $e)
		{
			// Continue Anyhow
		}

// Backup any old database.
		if (!$this->backupDatabase($db, $options->db_prefix))
		{
			return false;
		}

return true;
	}

/**
	 * Method to create the database tables.
	 *
	 * @param   string  $schema  The SQL schema file to apply.
	 *
	 * @return  boolean  True on success.
	 *
	 * @since   3.1
	 */
	public function createTables($schema)
	{
		if (!$db = $this->initialise())
		{
			return false;
		}

$serverType = $db->getServerType();

// Set the appropriate schema script based on UTF-8 support.
		$schemaFile = 'sql/' . $serverType . '/' . $schema . '.sql';

// Check if the schema is a valid file
		if (!is_file($schemaFile))
		{
			Factory::getApplication()->enqueueMessage(Text::sprintf('INSTL_ERROR_DB', Text::_('INSTL_DATABASE_NO_SCHEMA')), 'error');

return false;
		}

// Attempt to import the database schema.
		if (!$this->populateDatabase($db, $schemaFile))
		{
			return false;
		}

return true;
	}

/**
	 * Method to backup all tables in a database with a given prefix.
	 *
	 * @param   DatabaseDriver  $db      JDatabaseDriver object.
	 * @param   string          $prefix  Database table prefix.
	 *
	 * @return  boolean  True on success.
	 *
	 * @since    3.1
	 */
	public function backupDatabase($db, $prefix)
	{
		$return = true;
		$backup = 'bak_' . $prefix;

// Get the tables in the database.
		$tables = $db->getTableList();

if ($tables)
		{
			foreach ($tables as $table)
			{
				// If the table uses the given prefix, back it up.
				if (strpos($table, $prefix) === 0)
				{
					// Backup table name.
					$backupTable = str_replace($prefix, $backup, $table);

// Drop the backup table.
					try
					{
						$db->dropTable($backupTable, true);
					}
					catch (\RuntimeException $e)
					{
						Factory::getApplication()->enqueueMessage(Text::sprintf('INSTL_DATABASE_ERROR_BACKINGUP', $e->getMessage()), 'error');

$return = false;
					}

// Rename the current table to the backup table.
					try
					{
						$db->renameTable($table, $backupTable, $backup, $prefix);
					}
					catch (\RuntimeException $e)
					{
						Factory::getApplication()->enqueueMessage(Text::sprintf('INSTL_DATABASE_ERROR_BACKINGUP', $e->getMessage()), 'error');

$return = false;
					}
				}
			}
		}

return $return;
	}

/**
	 * Method to create a new database.
	 *
	 * @param   DatabaseDriver  $db       Database object.
	 * @param   CMSObject       $options  CMSObject coming from "initialise" function to pass user
	 *                                    and database name to database driver.
	 * @param   boolean         $utf      True if the database supports the UTF-8 character set.
	 *
	 * @return  boolean  True on success.
	 *
	 * @since   3.1
	 */
	public function createDb($db, $options, $utf)
	{
		// Build the create database query.
		try
		{
			// Run the create database query.
			$db->createDatabase($options, $utf);
		}
		catch (\RuntimeException $e)
		{
			// If an error occurred return false.
			return false;
		}

return true;
	}

/**
	 * Method to import a database schema from a file.
	 *
	 * @param   \Joomla\Database\DatabaseInterface  $db      JDatabase object.
	 * @param   string                              $schema  Path to the schema file.
	 *
	 * @return  boolean  True on success.
	 *
	 * @since   3.1
	 */
	public function populateDatabase($db, $schema)
	{
		$return = true;

// Get the contents of the schema file.
		if (!($buffer = file_get_contents($schema)))
		{
			Factory::getApplication()->enqueueMessage(Text::_('INSTL_SAMPLE_DATA_NOT_FOUND'), 'error');

return false;
		}

// Get an array of queries from the schema and process them.
		$queries = $this->splitQueries($buffer);

foreach ($queries as $query)
		{
			// Trim any whitespace.
			$query = trim($query);

// If the query isn't empty and is not a MySQL or PostgreSQL comment, execute it.
			if (!empty($query) && ($query[0] != '#') && ($query[0] != '-'))
			{
				// Execute the query.
				$db->setQuery($query);

try
				{
					$db->execute();
				}
				catch (\RuntimeException $e)
				{
					Factory::getApplication()->enqueueMessage($e->getMessage(), 'error');

$return = false;
				}
			}
		}

return $return;
	}

/**
	 * Method to split up queries from a schema file into an array.
	 *
	 * @param   string  $query  SQL schema.
	 *
	 * @return  array  Queries to perform.
	 *
	 * @since   3.1
	 */
	protected function splitQueries($query)
	{
		$buffer    = array();
		$queries   = array();
		$in_string = false;

// Trim any whitespace.
		$query = trim($query);

// Remove comment lines.
		$query = preg_replace("/\n\#[^\n]*/", '', "\n" . $query);

// Remove PostgreSQL comment lines.
		$query = preg_replace("/\n\--[^\n]*/", '', "\n" . $query);

// Find function.
		$funct = explode('CREATE OR REPLACE FUNCTION', $query);

// Save sql before function and parse it.
		$query = $funct[0];

// Parse the schema file to break up queries.
		for ($i = 0; $i < strlen($query) - 1; $i++)
		{
			if ($query[$i] == ';' && !$in_string)
			{
				$queries[] = substr($query, 0, $i);
				$query     = substr($query, $i + 1);
				$i         = 0;
			}

if ($in_string && ($query[$i] == $in_string) && $buffer[1] != "\\")
			{
				$in_string = false;
			}
			elseif (!$in_string && ($query[$i] == '"' || $query[$i] == "'") && (!isset($buffer[0]) || $buffer[0] != "\\"))
			{
				$in_string = $query[$i];
			}

if (isset($buffer[1]))
			{
				$buffer[0] = $buffer[1];
			}

$buffer[1] = $query[$i];
		}

// If the is anything left over, add it to the queries.
		if (!empty($query))
		{
			$queries[] = $query;
		}

// Add function part as is.
		for ($f = 1, $fMax = count($funct); $f < $fMax; $f++)
		{
			$queries[] = 'CREATE OR REPLACE FUNCTION ' . $funct[$f];
		}

return $queries;
	}
}