<?php
  /**
   * ownCloud
   *
   * @author Tom Needham
   * @copyright 2012 Tom Needham tom@owncloud.com
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
   * License as published by the Free Software Foundation; either
   * version 3 of the License, or any later version.
   *
   * This library 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 AFFERO GENERAL PUBLIC LICENSE for more details.
   *
   * You should have received a copy of the GNU Affero General Public
   * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
   *
   */
  
  
  /**
   * provides methods to add and access data from the migration
   */
  class OC_Migration_Content{
  
  	private $zip=false;

  	// Holds the database object

  	private $db=null;
  	// Holds an array of tmpfiles to delete after zip creation
  	private $tmpfiles=array();
  
  	/**

  	* sets up the
  	* @param ZipArchive $zip ZipArchive object
  	* @param object $db a database object (required for exporttype user)
  	* @return bool|null

  	*/
  	public function __construct( $zip, $db=null ) {
  
  		$this->zip = $zip;
  		$this->db = $db;
  
  	}

  	/**
  	 * prepares the db
  	 * @param string $query the sql query to prepare
  	 */

  	public function prepare( $query ) {
  
  		// Only add database to tmpfiles if actually used
  		if( !is_null( $this->db ) ) {
  			// Get db path
  			$db = $this->db->getDatabase();
  			if(!in_array($db, $this->tmpfiles)) {
  				$this->tmpfiles[] = $db;
  			}
  		}
  
  		// Optimize the query
  		$query = $this->processQuery( $query );
  
  		// Optimize the query
  		$query = $this->db->prepare( $query );

  		$query = new OC_DB_StatementWrapper($query, false);

  		return $query;

  	}
  
  	/**

  	* processes the db query
  	* @param string $query the query to process

  	* @return string of processed query
  	*/
  	private function processQuery( $query ) {
  		$query = str_replace( '`', '\'', $query );
  		$query = str_replace( 'NOW()', 'datetime(\'now\')', $query );
  		$query = str_replace( 'now()', 'datetime(\'now\')', $query );
  		// remove table prefixes
  		$query = str_replace( '*PREFIX*', '', $query );
  		return $query;
  	}
  
  	/**

  	* copys rows to migration.db from the main database
  	* @param array $options array of options.

  	* @return bool
  	*/
  	public function copyRows( $options ) {
  		if( !array_key_exists( 'table', $options ) ) {
  			return false;
  		}
  
  		$return = array();
  
  		// Need to include 'where' in the query?
  		if( array_key_exists( 'matchval', $options ) && array_key_exists( 'matchcol', $options ) ) {
  
  			// If only one matchval, create an array
  			if(!is_array($options['matchval'])) {
  				$options['matchval'] = array( $options['matchval'] );
  			}
  
  			foreach( $options['matchval'] as $matchval ) {
  				// Run the query for this match value (where x = y value)
  				$sql = 'SELECT * FROM `*PREFIX*' . $options['table'] . '` WHERE `' . $options['matchcol'] . '` = ?';
  				$query = OC_DB::prepare( $sql );
  				$results = $query->execute( array( $matchval ) );
  				$newreturns = $this->insertData( $results, $options );
  				$return = array_merge( $return, $newreturns );
  			}
  
  		} else {
  			// Just get everything
  			$sql = 'SELECT * FROM `*PREFIX*' . $options['table'] . '`';
  			$query = OC_DB::prepare( $sql );
  			$results = $query->execute();
  			$return = $this->insertData( $results, $options );
  
  		}
  
  		return $return;
  
  	}
  
  	/**

  	* saves a sql data set into migration.db
  	* @param OC_DB_StatementWrapper $data a sql data set returned from self::prepare()->query()
  	* @param array $options array of copyRows options

  	* @return void
  	*/
  	private function insertData( $data, $options ) {
  		$return = array();
  		// Foreach row of data to insert
  		while( $row = $data->fetchRow() ) {
  			// Now save all this to the migration.db
  			foreach($row as $field=>$value) {
  				$fields[] = $field;
  				$values[] = $value;
  			}
  
  			// Generate some sql
  			$sql = "INSERT INTO `" . $options['table'] . '` ( `';
  			$fieldssql = implode( '`, `', $fields );
  			$sql .= $fieldssql . "` ) VALUES( ";
  			$valuessql = substr( str_repeat( '?, ', count( $fields ) ), 0, -2 );
  			$sql .= $valuessql . " )";
  			// Make the query
  			$query = $this->prepare( $sql );

  			$query->execute( $values );
  			// Do we need to return some values?
  			if( array_key_exists( 'idcol', $options ) ) {
  				// Yes we do
  				$return[] = $row[$options['idcol']];

  			} else {

  				// Take a guess and return the first field :)
  				$return[] = reset($row);

  			}
  			$fields = '';
  			$values = '';
  		}
  		return $return;
  	}
  
  	/**

  	* adds a directory to the zip object
  	* @param boolean|string $dir string path of the directory to add
  	* @param bool $recursive
  	* @param string $internaldir path of folder to add dir to in zip

  	* @return bool
  	*/
  	public function addDir( $dir, $recursive=true, $internaldir='' ) {
  		$dirname = basename($dir);
  		$this->zip->addEmptyDir($internaldir . $dirname);
  		$internaldir.=$dirname.='/';
  		if( !file_exists( $dir ) ) {
  			return false;
  		}

  		$dirhandle = opendir($dir);
  		if(is_resource($dirhandle)) {

  			while (false !== ( $file = readdir($dirhandle))) {
  
  				if (( $file != '.' ) && ( $file != '..' )) {
  
  					if (is_dir($dir . '/' . $file) && $recursive) {
  						$this->addDir($dir . '/' . $file, $recursive, $internaldir);
  					} elseif (is_file($dir . '/' . $file)) {
  						$this->zip->addFile($dir . '/' . $file, $internaldir . $file);
  					}
  				}
  			}
  			closedir($dirhandle);
  		} else {
  			OC_Log::write('admin_export', "Was not able to open directory: " . $dir, OC_Log::ERROR);
  			return false;
  		}
  		return true;
  	}
  
  	/**

  	* adds a file to the zip from a given string
  	* @param string $data string of data to add
  	* @param string $path the relative path inside of the zip to save the file to

  	* @return bool
  	*/
  	public function addFromString( $data, $path ) {
  		// Create a temp file
  		$file = tempnam( get_temp_dir(). '/', 'oc_export_tmp_' );
  		$this->tmpfiles[] = $file;
  		if( !file_put_contents( $file, $data ) ) {
  			OC_Log::write( 'migation', 'Failed to save data to a temporary file', OC_Log::ERROR );
  			return false;
  		}
  		// Add file to the zip
  		$this->zip->addFile( $file, $path );
  		return true;
  	}
  
  	/**

  	* closes the zip, removes temp files

  	* @return bool
  	*/
  	public function finish() {
  		if( !$this->zip->close() ) {
  			OC_Log::write( 'migration',
  				'Failed to write the zip file with error: '.$this->zip->getStatusString(),
  				OC_Log::ERROR );
  			return false;
  		}
  		$this->cleanup();
  		return true;
  	}
  
  		/**

  	* cleans up after the zip

  	*/
  	private function cleanup() {
  		// Delete tmp files
  		foreach($this->tmpfiles as $i) {
  			unlink( $i );
  		}
  	}
  }