<?php

namespace TablePress\PhpOffice\PhpSpreadsheet\Cell;

use TablePress\PhpOffice\PhpSpreadsheet\Calculation\Calculation;
use TablePress\PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;
use TablePress\PhpOffice\PhpSpreadsheet\Exception;

/**
 * Validate a cell value according to its validation rules.
 */
class DataValidator
{
	/**
	 * Does this cell contain valid value?
	 *
	 * @param Cell $cell Cell to check the value
	 *
	 * @return bool
	 */
	public function isValid(Cell $cell)
	{
		if (!$cell->hasDataValidation()) {
			return true;
		}

		$cellValue = $cell->getValue();
		$dataValidation = $cell->getDataValidation();

		if (!$dataValidation->getAllowBlank() && ($cellValue === null || $cellValue === '')) {
			return false;
		}

		// TODO: write check on all cases
		switch ($dataValidation->getType()) {
			case DataValidation::TYPE_LIST:
				return $this->isValueInList($cell);
		}

		return false;
	}

	/**
	 * Does this cell contain valid value, based on list?
	 *
	 * @param Cell $cell Cell to check the value
	 *
	 * @return bool
	 */
	private function isValueInList(Cell $cell)
	{
		$cellValue = $cell->getValue();
		$dataValidation = $cell->getDataValidation();

		$formula1 = $dataValidation->getFormula1();
		if (!empty($formula1)) {
			// inline values list
			if ($formula1[0] === '"') {
				return in_array(strtolower($cellValue), explode(',', strtolower(trim($formula1, '"'))), true);
			} elseif (strpos($formula1, ':') > 0) {
				// values list cells
				$matchFormula = '=MATCH(' . $cell->getCoordinate() . ', ' . $formula1 . ', 0)';
				$calculation = Calculation::getInstance($cell->getWorksheet()->getParent());

				try {
					$result = $calculation->calculateFormula($matchFormula, $cell->getCoordinate(), $cell);
					while (is_array($result)) {
						$result = array_pop($result);
					}

					return $result !== ExcelError::NA();
				} catch (Exception $ex) {
					return false;
				}
			}
		}

		return true;
	}
}
