<?php

namespace TablePress\PhpOffice\PhpSpreadsheet\Calculation\MathTrig;

use TablePress\PhpOffice\PhpSpreadsheet\Calculation\Functions;
use TablePress\PhpOffice\PhpSpreadsheet\Calculation\Information\ErrorValue;
use TablePress\PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;
use TablePress\PhpOffice\PhpSpreadsheet\Calculation\Information\Value;

class Sum
{
	/**
	 * SUM, ignoring non-numeric non-error strings. This is eventually used by SUMIF.
	 *
	 * SUM computes the sum of all the values and cells referenced in the argument list.
	 *
	 * Excel Function:
	 *        SUM(value1[,value2[, ...]])
	 *
	 * @param mixed ...$args Data values
	 *
	 * @return float|string
	 */
	public static function sumIgnoringStrings(...$args)
	{
		$returnValue = 0;

		// Loop through the arguments
		foreach (Functions::flattenArray($args) as $arg) {
			// Is it a numeric value?
			if (is_numeric($arg)) {
				$returnValue += $arg;
			} elseif (ErrorValue::isError($arg)) {
				return $arg;
			}
		}

		return $returnValue;
	}

	/**
	 * SUM, returning error for non-numeric strings. This is used by Excel SUM function.
	 *
	 * SUM computes the sum of all the values and cells referenced in the argument list.
	 *
	 * Excel Function:
	 *        SUM(value1[,value2[, ...]])
	 *
	 * @param mixed ...$args Data values
	 *
	 * @return float|string
	 */
	public static function sumErroringStrings(...$args)
	{
		$returnValue = 0;
		// Loop through the arguments
		$aArgs = Functions::flattenArrayIndexed($args);
		foreach ($aArgs as $k => $arg) {
			// Is it a numeric value?
			if (is_numeric($arg) || empty($arg)) {
				if (is_string($arg)) {
					$arg = (int) $arg;
				}
				$returnValue += $arg;
			} elseif (is_bool($arg)) {
				$returnValue += (int) $arg;
			} elseif (ErrorValue::isError($arg)) {
				return $arg;
			// ignore non-numerics from cell, but fail as literals (except null)
			} elseif ($arg !== null && !Functions::isCellValue($k)) {
				return ExcelError::VALUE();
			}
		}

		return $returnValue;
	}

	/**
	 * SUMPRODUCT.
	 *
	 * Excel Function:
	 *        SUMPRODUCT(value1[,value2[, ...]])
	 *
	 * @param mixed ...$args Data values
	 *
	 * @return float|string The result, or a string containing an error
	 */
	public static function product(...$args)
	{
		$arrayList = $args;

		$wrkArray = Functions::flattenArray(array_shift($arrayList));
		$wrkCellCount = count($wrkArray);

		for ($i = 0; $i < $wrkCellCount; ++$i) {
			if ((!is_numeric($wrkArray[$i])) || (is_string($wrkArray[$i]))) {
				$wrkArray[$i] = 0;
			}
		}

		foreach ($arrayList as $matrixData) {
			$array2 = Functions::flattenArray($matrixData);
			$count = count($array2);
			if ($wrkCellCount != $count) {
				return ExcelError::VALUE();
			}

			foreach ($array2 as $i => $val) {
				if ((!is_numeric($val)) || (is_string($val))) {
					$val = 0;
				}
				$wrkArray[$i] *= $val;
			}
		}

		return array_sum($wrkArray);
	}
}
