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<?php

namespace PhpOffice\PhpSpreadsheet\Calculation\TextData;

use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Shared\StringHelper;

class CaseConvert
{
    /**
     * LOWERCASE.
     *
     * Converts a string value to upper case.
     *
     * @param mixed $mixedCaseValue The string value to convert to lower case
     */
    public static function lower($mixedCaseValue): string
    {
        $mixedCaseValue = Functions::flattenSingleValue($mixedCaseValue);
        $mixedCaseValue = Helpers::extractString($mixedCaseValue);

return StringHelper::strToLower($mixedCaseValue);
    }

/**
     * UPPERCASE.
     *
     * Converts a string value to upper case.
     *
     * @param mixed $mixedCaseValue The string value to convert to upper case
     */
    public static function upper($mixedCaseValue): string
    {
        $mixedCaseValue = Functions::flattenSingleValue($mixedCaseValue);
        $mixedCaseValue = Helpers::extractString($mixedCaseValue);

return StringHelper::strToUpper($mixedCaseValue);
    }

/**
     * PROPERCASE.
     *
     * Converts a string value to proper or title case.
     *
     * @param mixed $mixedCaseValue The string value to convert to title case
     */
    public static function proper($mixedCaseValue): string
    {
        $mixedCaseValue = Functions::flattenSingleValue($mixedCaseValue);
        $mixedCaseValue = Helpers::extractString($mixedCaseValue);

return StringHelper::strToTitle($mixedCaseValue);
    }
}