<?php

/**

 * PHPExcel

 *

 * Copyright (c) 2006 - 2011 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_Calculation

 * @copyright	Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)

 * @license		http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL

 * @version		1.7.6, 2011-02-27

 */





/** PHPExcel root directory */

if (!defined('PHPEXCEL_ROOT')) {

	/**

	 * @ignore

	 */

	define('PHPEXCEL_ROOT', dirname(__FILE__) . '/../../');

	require(PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php');

}





/**

 * PHPExcel_Calculation_Database

 *

 * @category	PHPExcel

 * @package		PHPExcel_Calculation

 * @copyright	Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)

 */

class PHPExcel_Calculation_Database {





	private static function __fieldExtract($database,$field) {

		$field = strtoupper(PHPExcel_Calculation_Functions::flattenSingleValue($field));

		$fieldNames = array_map('strtoupper',array_shift($database));



		if (is_numeric($field)) {

			$keys = array_keys($fieldNames);

			return $keys[$field-1];

		}

		$key = array_search($field,$fieldNames);

		return ($key) ? $key : null;

	}



	private static function __filter($database,$criteria) {

		$fieldNames = array_shift($database);

		$criteriaNames = array_shift($criteria);



		//	Convert the criteria into a set of AND/OR conditions with [:placeholders]

		$testConditions = $testValues = array();

		$testConditionsCount = 0;

		foreach($criteriaNames as $key => $criteriaName) {

			$testCondition = array();

			$testConditionCount = 0;

			foreach($criteria as $row => $criterion) {

				if ($criterion[$key] > '') {

					$testCondition[] = '[:'.$criteriaName.']'.PHPExcel_Calculation_Functions::_ifCondition($criterion[$key]);

					$testConditionCount++;

				}

			}

			if ($testConditionCount > 1) {

				$testConditions[] = 'OR('.implode(',',$testCondition).')';

				$testConditionsCount++;

			} elseif($testConditionCount == 1) {

				$testConditions[] = $testCondition[0];

				$testConditionsCount++;

			}

		}

		if ($testConditionsCount > 1) {

			$testConditionSet = 'AND('.implode(',',$testConditions).')';

		} elseif($testConditionsCount == 1) {

			$testConditionSet = $testConditions[0];

		}



		//	Loop through each row of the database

		foreach($database as $dataRow => $dataValues) {

			//	Substitute actual values from the database row for our [:placeholders]

			$testConditionList = $testConditionSet;

			foreach($criteriaNames as $key => $criteriaName) {

				$k = array_search($criteriaName,$fieldNames);

				if (isset($dataValues[$k])) {

					$dataValue = $dataValues[$k];

					$dataValue = (is_string($dataValue)) ? PHPExcel_Calculation::_wrapResult(strtoupper($dataValue)) : $dataValue;

					$testConditionList = str_replace('[:'.$criteriaName.']',$dataValue,$testConditionList);

				}

			}

			//	evaluate the criteria against the row data

			$result = PHPExcel_Calculation::getInstance()->_calculateFormulaValue('='.$testConditionList);

			//	If the row failed to meet the criteria, remove it from the database

			if (!$result) {

				unset($database[$dataRow]);

			}

		}



		return $database;

	}





	/**

	 *	DAVERAGE

	 *

	 */

	public static function DAVERAGE($database,$field,$criteria) {

		$field = self::__fieldExtract($database,$field);

		if (is_null($field)) {

			return NULL;

		}



		//	reduce the database to a set of rows that match all the criteria

		$database = self::__filter($database,$criteria);

		//	extract an array of values for the requested column

		$colData = array();

		foreach($database as $row) {

			$colData[] = $row[$field];

		}



		// Return

		return PHPExcel_Calculation_Statistical::AVERAGE($colData);

	}	//	function DAVERAGE()



	/**

	 *	DCOUNT

	 *

	 */

	public static function DCOUNT($database,$field,$criteria) {

		$field = self::__fieldExtract($database,$field);

		if (is_null($field)) {

			return NULL;

		}



		//	reduce the database to a set of rows that match all the criteria

		$database = self::__filter($database,$criteria);

		//	extract an array of values for the requested column

		$colData = array();

		foreach($database as $row) {

			$colData[] = $row[$field];

		}



		// Return

		return PHPExcel_Calculation_Statistical::COUNT($colData);

	}	//	function DCOUNT()



	/**

	 *	DCOUNTA

	 *

	 */

	public static function DCOUNTA($database,$field,$criteria) {

		$field = self::__fieldExtract($database,$field);

		if (is_null($field)) {

			return NULL;

		}



		//	reduce the database to a set of rows that match all the criteria

		$database = self::__filter($database,$criteria);

		//	extract an array of values for the requested column

		$colData = array();

		foreach($database as $row) {

			$colData[] = $row[$field];

		}



		// Return

		return PHPExcel_Calculation_Statistical::COUNTA($colData);

	}	//	function DCOUNTA()



	/**

	 *	DGET

	 *

	 */

	public static function DGET($database,$field,$criteria) {

		$field = self::__fieldExtract($database,$field);

		if (is_null($field)) {

			return NULL;

		}



		//	reduce the database to a set of rows that match all the criteria

		$database = self::__filter($database,$criteria);

		//	extract an array of values for the requested column

		$colData = array();

		foreach($database as $row) {

			$colData[] = $row[$field];

		}



		// Return

		if (count($colData) > 1) {

			return PHPExcel_Calculation_Functions::NaN();

		}



		return $colData[0];

	}	//	function DGET()



	/**

	 *	DMAX

	 *

	 */

	public static function DMAX($database,$field,$criteria) {

		$field = self::__fieldExtract($database,$field);

		if (is_null($field)) {

			return NULL;

		}



		//	reduce the database to a set of rows that match all the criteria

		$database = self::__filter($database,$criteria);

		//	extract an array of values for the requested column

		$colData = array();

		foreach($database as $row) {

			$colData[] = $row[$field];

		}



		// Return

		return PHPExcel_Calculation_Statistical::MAX($colData);

	}	//	function DMAX()



	/**

	 *	DMIN

	 *

	 */

	public static function DMIN($database,$field,$criteria) {

		$field = self::__fieldExtract($database,$field);

		if (is_null($field)) {

			return NULL;

		}



		//	reduce the database to a set of rows that match all the criteria

		$database = self::__filter($database,$criteria);

		//	extract an array of values for the requested column

		$colData = array();

		foreach($database as $row) {

			$colData[] = $row[$field];

		}



		// Return

		return PHPExcel_Calculation_Statistical::MIN($colData);

	}	//	function DMIN()



	/**

	 *	DPRODUCT

	 *

	 */

	public static function DPRODUCT($database,$field,$criteria) {

		$field = self::__fieldExtract($database,$field);

		if (is_null($field)) {

			return NULL;

		}



		//	reduce the database to a set of rows that match all the criteria

		$database = self::__filter($database,$criteria);

		//	extract an array of values for the requested column

		$colData = array();

		foreach($database as $row) {

			$colData[] = $row[$field];

		}



		// Return

		return PHPExcel_Calculation_MathTrig::PRODUCT($colData);

	}	//	function DPRODUCT()



	/**

	 *	DSTDEV

	 *

	 */

	public static function DSTDEV($database,$field,$criteria) {

		$field = self::__fieldExtract($database,$field);

		if (is_null($field)) {

			return NULL;

		}



		//	reduce the database to a set of rows that match all the criteria

		$database = self::__filter($database,$criteria);

		//	extract an array of values for the requested column

		$colData = array();

		foreach($database as $row) {

			$colData[] = $row[$field];

		}



		// Return

		return PHPExcel_Calculation_Statistical::STDEV($colData);

	}	//	function DSTDEV()



	/**

	 *	DSTDEVP

	 *

	 */

	public static function DSTDEVP($database,$field,$criteria) {

		$field = self::__fieldExtract($database,$field);

		if (is_null($field)) {

			return NULL;

		}



		//	reduce the database to a set of rows that match all the criteria

		$database = self::__filter($database,$criteria);

		//	extract an array of values for the requested column

		$colData = array();

		foreach($database as $row) {

			$colData[] = $row[$field];

		}



		// Return

		return PHPExcel_Calculation_Statistical::STDEVP($colData);

	}	//	function DSTDEVP()



	/**

	 *	DSUM

	 *

	 */

	public static function DSUM($database,$field,$criteria) {

		$field = self::__fieldExtract($database,$field);

		if (is_null($field)) {

			return NULL;

		}



		//	reduce the database to a set of rows that match all the criteria

		$database = self::__filter($database,$criteria);

		//	extract an array of values for the requested column

		$colData = array();

		foreach($database as $row) {

			$colData[] = $row[$field];

		}



		// Return

		return PHPExcel_Calculation_MathTrig::SUM($colData);

	}	//	function DSUM()



	/**

	 *	DVAR

	 *

	 */

	public static function DVAR($database,$field,$criteria) {

		$field = self::__fieldExtract($database,$field);

		if (is_null($field)) {

			return NULL;

		}



		//	reduce the database to a set of rows that match all the criteria

		$database = self::__filter($database,$criteria);

		//	extract an array of values for the requested column

		$colData = array();

		foreach($database as $row) {

			$colData[] = $row[$field];

		}



		// Return

		return PHPExcel_Calculation_Statistical::VARFunc($colData);

	}	//	function DVAR()



	/**

	 *	DVARP

	 *

	 */

	public static function DVARP($database,$field,$criteria) {

		$field = self::__fieldExtract($database,$field);

		if (is_null($field)) {

			return NULL;

		}



		//	reduce the database to a set of rows that match all the criteria

		$database = self::__filter($database,$criteria);

		//	extract an array of values for the requested column

		$colData = array();

		foreach($database as $row) {

			$colData[] = $row[$field];

		}



		// Return

		return PHPExcel_Calculation_Statistical::VARP($colData);

	}	//	function DVARP()





}	//	class PHPExcel_Calculation_Database