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<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2013 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_CachedObjectStorage
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version    ##VERSION##, ##DATE##
 */


/**
 * PHPExcel_CachedObjectStorage_SQLite3
 *
 * @category   PHPExcel
 * @package    PHPExcel_CachedObjectStorage
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_CachedObjectStorage_SQLite3 extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {

        /**
         * Database table name
         *
         * @var string
         */
        private $_TableName = null;

        /**
         * Database handle
         *
         * @var resource
         */
        private $_DBHandle = null;

        /**
         * Prepared statement for a SQLite3 select query
         *
         * @var SQLite3Stmt
         */
        private $_selectQuery;

        /**
         * Prepared statement for a SQLite3 insert query
         *
         * @var SQLite3Stmt
         */
        private $_insertQuery;

        /**
         * Prepared statement for a SQLite3 update query
         *
         * @var SQLite3Stmt
         */
        private $_updateQuery;

        /**
         * Prepared statement for a SQLite3 delete query
         *
         * @var SQLite3Stmt
         */
        private $_deleteQuery;

    /**
     * Store cell data in cache for the current cell object if it's "dirty",
     *     and the 'nullify' the current cell object
     *
         * @return      void
     * @throws  PHPExcel_Exception
     */
        protected function _storeData() {
                if ($this->_currentCellIsDirty) {
                        $this->_currentObject->detach();

                        $this->_insertQuery->bindValue('id',$this->_currentObjectID,SQLITE3_TEXT);
                        $this->_insertQuery->bindValue('data',serialize($this->_currentObject),SQLITE3_BLOB);
                        $result = $this->_insertQuery->execute();
                        if ($result === false)
                                throw new PHPExcel_Exception($this->_DBHandle->lastErrorMsg());
                        $this->_currentCellIsDirty = false;
                }
                $this->_currentObjectID = $this->_currentObject = null;
        }       //      function _storeData()


    /**
     * Add or Update a cell in cache identified by coordinate address
     *
     * @param   string                  $pCoord         Coordinate address of the cell to update
     * @param   PHPExcel_Cell   $cell           Cell to update
         * @return      void
     * @throws  PHPExcel_Exception
     */
        public function addCacheData($pCoord, PHPExcel_Cell $cell) {
                if (($pCoord !== $this->_currentObjectID) && ($this->_currentObjectID !== null)) {
                        $this->_storeData();
                }

                $this->_currentObjectID = $pCoord;
                $this->_currentObject = $cell;
                $this->_currentCellIsDirty = true;

                return $cell;
        }       //      function addCacheData()


    /**
     * Get cell at a specific coordinate
     *
     * @param   string                  $pCoord         Coordinate of the cell
     * @throws  PHPExcel_Exception
     * @return  PHPExcel_Cell   Cell that was found, or null if not found
     */
        public function getCacheData($pCoord) {
                if ($pCoord === $this->_currentObjectID) {
                        return $this->_currentObject;
                }
                $this->_storeData();

                $this->_selectQuery->bindValue('id',$pCoord,SQLITE3_TEXT);
                $cellResult = $this->_selectQuery->execute();
                if ($cellResult === FALSE) {
                        throw new PHPExcel_Exception($this->_DBHandle->lastErrorMsg());
                }
                $cellData = $cellResult->fetchArray(SQLITE3_ASSOC);
                if ($cellData === FALSE) {
                        //      Return null if requested entry doesn't exist in cache
                        return NULL;
                }

                //      Set current entry to the requested entry
                $this->_currentObjectID = $pCoord;

                $this->_currentObject = unserialize($cellData['value']);
        //    Re-attach this as the cell's parent
        $this->_currentObject->attach($this);

                //      Return requested entry
                return $this->_currentObject;
        }       //      function getCacheData()


        /**
         *      Is a value set for an indexed cell?
         *
         * @param       string          $pCoord         Coordinate address of the cell to check
         * @return      boolean
         */
        public function isDataSet($pCoord) {
                if ($pCoord === $this->_currentObjectID) {
                        return TRUE;
                }

                //      Check if the requested entry exists in the cache
                $this->_selectQuery->bindValue('id',$pCoord,SQLITE3_TEXT);
                $cellResult = $this->_selectQuery->execute();
                if ($cellResult === FALSE) {
                        throw new PHPExcel_Exception($this->_DBHandle->lastErrorMsg());
                }
                $cellData = $cellResult->fetchArray(SQLITE3_ASSOC);

                return ($cellData === FALSE) ? FALSE : TRUE;
        }       //      function isDataSet()


    /**
     *  Delete a cell in cache identified by coordinate address
     *
     * @param   string                  $pCoord         Coordinate address of the cell to delete
     * @throws  PHPExcel_Exception
     */
        public function deleteCacheData($pCoord) {
                if ($pCoord === $this->_currentObjectID) {
                        $this->_currentObject->detach();
                        $this->_currentObjectID = $this->_currentObject = NULL;
                }

                //      Check if the requested entry exists in the cache
                $this->_deleteQuery->bindValue('id',$pCoord,SQLITE3_TEXT);
                $result = $this->_deleteQuery->execute();
                if ($result === FALSE)
                        throw new PHPExcel_Exception($this->_DBHandle->lastErrorMsg());

                $this->_currentCellIsDirty = FALSE;
        }       //      function deleteCacheData()


        /**
         * Move a cell object from one address to another
         *
         * @param       string          $fromAddress    Current address of the cell to move
         * @param       string          $toAddress              Destination address of the cell to move
         * @return      boolean
         */
        public function moveCell($fromAddress, $toAddress) {
                if ($fromAddress === $this->_currentObjectID) {
                        $this->_currentObjectID = $toAddress;
                }

                $this->_deleteQuery->bindValue('id',$toAddress,SQLITE3_TEXT);
                $result = $this->_deleteQuery->execute();
                if ($result === false)
                        throw new PHPExcel_Exception($this->_DBHandle->lastErrorMsg());

                $this->_updateQuery->bindValue('toid',$toAddress,SQLITE3_TEXT);
                $this->_updateQuery->bindValue('fromid',$fromAddress,SQLITE3_TEXT);
                $result = $this->_updateQuery->execute();
                if ($result === false)
                        throw new PHPExcel_Exception($this->_DBHandle->lastErrorMsg());

                return TRUE;
        }       //      function moveCell()


        /**
         * Get a list of all cell addresses currently held in cache
         *
         * @return      array of string
         */
        public function getCellList() {
                if ($this->_currentObjectID !== null) {
                        $this->_storeData();
                }

                $query = "SELECT id FROM kvp_".$this->_TableName;
                $cellIdsResult = $this->_DBHandle->query($query);
                if ($cellIdsResult === false)
                        throw new PHPExcel_Exception($this->_DBHandle->lastErrorMsg());

                $cellKeys = array();
                while ($row = $cellIdsResult->fetchArray(SQLITE3_ASSOC)) {
                        $cellKeys[] = $row['id'];
                }

                return $cellKeys;
        }       //      function getCellList()


        /**
         * Clone the cell collection
         *
         * @param       PHPExcel_Worksheet      $parent         The new worksheet
         * @return      void
         */
        public function copyCellCollection(PHPExcel_Worksheet $parent) {
                $this->_currentCellIsDirty;
        $this->_storeData();

                //      Get a new id for the new table name
                $tableName = str_replace('.','_',$this->_getUniqueID());
                if (!$this->_DBHandle->exec('CREATE TABLE kvp_'.$tableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)
                                                       AS SELECT * FROM kvp_'.$this->_TableName))
                        throw new PHPExcel_Exception($this->_DBHandle->lastErrorMsg());

                //      Copy the existing cell cache file
                $this->_TableName = $tableName;
        }       //      function copyCellCollection()


        /**
         * Clear the cell collection and disconnect from our parent
         *
         * @return      void
         */
        public function unsetWorksheetCells() {
                if(!is_null($this->_currentObject)) {
                        $this->_currentObject->detach();
                        $this->_currentObject = $this->_currentObjectID = null;
                }
                //      detach ourself from the worksheet, so that it can then delete this object successfully
                $this->_parent = null;

                //      Close down the temporary cache file
                $this->__destruct();
        }       //      function unsetWorksheetCells()


        /**
         * Initialise this new cell collection
         *
         * @param       PHPExcel_Worksheet      $parent         The worksheet for this cell collection
         */
        public function __construct(PHPExcel_Worksheet $parent) {
                parent::__construct($parent);
                if (is_null($this->_DBHandle)) {
                        $this->_TableName = str_replace('.','_',$this->_getUniqueID());
                        $_DBName = ':memory:';

                        $this->_DBHandle = new SQLite3($_DBName);
                        if ($this->_DBHandle === false)
                                throw new PHPExcel_Exception($this->_DBHandle->lastErrorMsg());
                        if (!$this->_DBHandle->exec('CREATE TABLE kvp_'.$this->_TableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)'))
                                throw new PHPExcel_Exception($this->_DBHandle->lastErrorMsg());
                }

                $this->_selectQuery = $this->_DBHandle->prepare("SELECT value FROM kvp_".$this->_TableName." WHERE id = :id");
                $this->_insertQuery = $this->_DBHandle->prepare("INSERT OR REPLACE INTO kvp_".$this->_TableName." VALUES(:id,:data)");
                $this->_updateQuery = $this->_DBHandle->prepare("UPDATE kvp_".$this->_TableName." SET id=:toId WHERE id=:fromId");
                $this->_deleteQuery = $this->_DBHandle->prepare("DELETE FROM kvp_".$this->_TableName." WHERE id = :id");
        }       //      function __construct()


        /**
         * Destroy this cell collection
         */
        public function __destruct() {
                if (!is_null($this->_DBHandle)) {
                        $this->_DBHandle->exec('DROP TABLE kvp_'.$this->_TableName);
                        $this->_DBHandle->close();
                }
                $this->_DBHandle = null;
        }       //      function __destruct()


        /**
         * Identify whether the caching method is currently available
         * Some methods are dependent on the availability of certain extensions being enabled in the PHP build
         *
         * @return      boolean
         */
        public static function cacheMethodIsAvailable() {
                if (!class_exists('SQLite3',FALSE)) {
                        return false;
                }

                return true;
        }

}