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<?php

namespace PhpOffice\PhpSpreadsheet\Shared;

use DateTime;

use DateTimeInterface;

use DateTimeZone;

use PhpOffice\PhpSpreadsheet\Calculation\DateTimeExcel;

use PhpOffice\PhpSpreadsheet\Calculation\Functions;

use PhpOffice\PhpSpreadsheet\Cell\Cell;

use PhpOffice\PhpSpreadsheet\Exception;

use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;

use PhpOffice\PhpSpreadsheet\Shared\Date as SharedDate;

use PhpOffice\PhpSpreadsheet\Style\NumberFormat;

class Date

{

    /** constants */

    const CALENDAR_WINDOWS_1900 = 1900; //    Base date of 1st Jan 1900 = 1.0

    const CALENDAR_MAC_1904 = 1904; //    Base date of 2nd Jan 1904 = 1.0

    /**

     * Names of the months of the year, indexed by shortname

     * Planned usage for locale settings.

     *

     * @var string[]

     */

    public static $monthNames = [

        'Jan' => 'January',

        'Feb' => 'February',

        'Mar' => 'March',

        'Apr' => 'April',

        'May' => 'May',

        'Jun' => 'June',

        'Jul' => 'July',

        'Aug' => 'August',

        'Sep' => 'September',

        'Oct' => 'October',

        'Nov' => 'November',

        'Dec' => 'December',

    ];

    /**

     * @var string[]

     */

    public static $numberSuffixes = [

        'st',

        'nd',

        'rd',

        'th',

    ];

    /**

     * Base calendar year to use for calculations

     * Value is either CALENDAR_WINDOWS_1900 (1900) or CALENDAR_MAC_1904 (1904).

     *

     * @var int

     */

    protected static $excelCalendar = self::CALENDAR_WINDOWS_1900;

    /**

     * Default timezone to use for DateTime objects.

     *

     * @var null|DateTimeZone

     */

    protected static $defaultTimeZone;

    /**

     * Set the Excel calendar (Windows 1900 or Mac 1904).

     *

     * @param int $baseYear Excel base date (1900 or 1904)

     *

     * @return bool Success or failure

     */

    public static function setExcelCalendar($baseYear)

    {

        if (

            ($baseYear == self::CALENDAR_WINDOWS_1900) ||

            ($baseYear == self::CALENDAR_MAC_1904)

        ) {

            self::$excelCalendar = $baseYear;

            return true;

        }

        return false;

    }

    /**

     * Return the Excel calendar (Windows 1900 or Mac 1904).

     *

     * @return int Excel base date (1900 or 1904)

     */

    public static function getExcelCalendar()

    {

        return self::$excelCalendar;

    }

    /**

     * Set the Default timezone to use for dates.

     *

     * @param null|DateTimeZone|string $timeZone The timezone to set for all Excel datetimestamp to PHP DateTime Object conversions

     *

     * @return bool Success or failure

     */

    public static function setDefaultTimezone($timeZone)

    {

        try {

            $timeZone = self::validateTimeZone($timeZone);

            self::$defaultTimeZone = $timeZone;

            $retval = true;

        } catch (PhpSpreadsheetException $e) {

            $retval = false;

        }

        return $retval;

    }

    /**

     * Return the Default timezone, or UTC if default not set.

     */

    public static function getDefaultTimezone(): DateTimeZone

    {

        return self::$defaultTimeZone ?? new DateTimeZone('UTC');

    }

    /**

     * Return the Default timezone, or local timezone if default is not set.

     */

    public static function getDefaultOrLocalTimezone(): DateTimeZone

    {

        return self::$defaultTimeZone ?? new DateTimeZone(date_default_timezone_get());

    }

    /**

     * Return the Default timezone even if null.

     */

    public static function getDefaultTimezoneOrNull(): ?DateTimeZone

    {

        return self::$defaultTimeZone;

    }

    /**

     * Validate a timezone.

     *

     * @param null|DateTimeZone|string $timeZone The timezone to validate, either as a timezone string or object

     *

     * @return ?DateTimeZone The timezone as a timezone object

     */

    private static function validateTimeZone($timeZone)

    {

        if ($timeZone instanceof DateTimeZone || $timeZone === null) {

            return $timeZone;

        }

        if (in_array($timeZone, DateTimeZone::listIdentifiers(DateTimeZone::ALL_WITH_BC))) {

            return new DateTimeZone($timeZone);

        }

        throw new PhpSpreadsheetException('Invalid timezone');

    }

    /**

     * @param mixed $value Converts a date/time in ISO-8601 standard format date string to an Excel

     *                         serialized timestamp.

     *                     See https://en.wikipedia.org/wiki/ISO_8601 for details of the ISO-8601 standard format.

     *

     * @return float|int

     */

    public static function convertIsoDate($value)

    {

        if (!is_string($value)) {

            throw new Exception('Non-string value supplied for Iso Date conversion');

        }

        $date = new DateTime($value);

        $dateErrors = DateTime::getLastErrors();

        if (is_array($dateErrors) && ($dateErrors['warning_count'] > 0 || $dateErrors['error_count'] > 0)) {

            throw new Exception("Invalid string $value supplied for datatype Date");

        }

        $newValue = SharedDate::PHPToExcel($date);

        if ($newValue === false) {

            throw new Exception("Invalid string $value supplied for datatype Date");

        }

        if (preg_match('/^\\s*\\d?\\d:\\d\\d(:\\d\\d([.]\\d+)?)?\\s*(am|pm)?\\s*$/i', $value) == 1) {

            $newValue = fmod($newValue, 1.0);

        }

        return $newValue;

    }

    /**

     * Convert a MS serialized datetime value from Excel to a PHP Date/Time object.

     *

     * @param float|int $excelTimestamp MS Excel serialized date/time value

     * @param null|DateTimeZone|string $timeZone The timezone to assume for the Excel timestamp,

     *                                           if you don't want to treat it as a UTC value

     *                                           Use the default (UTC) unless you absolutely need a conversion

     *

     * @return DateTime PHP date/time object

     */

    public static function excelToDateTimeObject($excelTimestamp, $timeZone = null)

    {

        $timeZone = ($timeZone === null) ? self::getDefaultTimezone() : self::validateTimeZone($timeZone);

        if (Functions::getCompatibilityMode() == Functions::COMPATIBILITY_EXCEL) {

            if ($excelTimestamp < 1 && self::$excelCalendar === self::CALENDAR_WINDOWS_1900) {

                // Unix timestamp base date

                $baseDate = new DateTime('1970-01-01', $timeZone);

            } else {

                // MS Excel calendar base dates

                if (self::$excelCalendar == self::CALENDAR_WINDOWS_1900) {

                    // Allow adjustment for 1900 Leap Year in MS Excel

                    $baseDate = ($excelTimestamp < 60) ? new DateTime('1899-12-31', $timeZone) : new DateTime('1899-12-30', $timeZone);

                } else {

                    $baseDate = new DateTime('1904-01-01', $timeZone);

                }

            }

        } else {

            $baseDate = new DateTime('1899-12-30', $timeZone);

        }

        $days = floor($excelTimestamp);

        $partDay = $excelTimestamp - $days;

        $hours = floor($partDay * 24);

        $partDay = $partDay * 24 - $hours;

        $minutes = floor($partDay * 60);

        $partDay = $partDay * 60 - $minutes;

        $seconds = round($partDay * 60);

        if ($days >= 0) {

            $days = '+' . $days;

        }

        $interval = $days . ' days';

        return $baseDate->modify($interval)

            ->setTime((int) $hours, (int) $minutes, (int) $seconds);

    }

    /**

     * Convert a MS serialized datetime value from Excel to a unix timestamp.

     * The use of Unix timestamps, and therefore this function, is discouraged.

     * They are not Y2038-safe on a 32-bit system, and have no timezone info.

     *

     * @param float|int $excelTimestamp MS Excel serialized date/time value

     * @param null|DateTimeZone|string $timeZone The timezone to assume for the Excel timestamp,

     *                                               if you don't want to treat it as a UTC value

     *                                               Use the default (UTC) unless you absolutely need a conversion

     *

     * @return int Unix timetamp for this date/time

     */

    public static function excelToTimestamp($excelTimestamp, $timeZone = null)

    {

        return (int) self::excelToDateTimeObject($excelTimestamp, $timeZone)

            ->format('U');

    }

    /**

     * Convert a date from PHP to an MS Excel serialized date/time value.

     *

     * @param mixed $dateValue PHP DateTime object or a string - Unix timestamp is also permitted, but discouraged;

     *    not Y2038-safe on a 32-bit system, and no timezone info

     *

     * @return false|float Excel date/time value

     *                                  or boolean FALSE on failure

     */

    public static function PHPToExcel($dateValue)

    {

        if ((is_object($dateValue)) && ($dateValue instanceof DateTimeInterface)) {

            return self::dateTimeToExcel($dateValue);

        } elseif (is_numeric($dateValue)) {

            return self::timestampToExcel($dateValue);

        } elseif (is_string($dateValue)) {

            return self::stringToExcel($dateValue);

        }

        return false;

    }

    /**

     * Convert a PHP DateTime object to an MS Excel serialized date/time value.

     *

     * @param DateTimeInterface $dateValue PHP DateTime object

     *

     * @return float MS Excel serialized date/time value

     */

    public static function dateTimeToExcel(DateTimeInterface $dateValue)

    {

        return self::formattedPHPToExcel(

            (int) $dateValue->format('Y'),

            (int) $dateValue->format('m'),

            (int) $dateValue->format('d'),

            (int) $dateValue->format('H'),

            (int) $dateValue->format('i'),

            (int) $dateValue->format('s')

        );

    }

    /**

     * Convert a Unix timestamp to an MS Excel serialized date/time value.

     * The use of Unix timestamps, and therefore this function, is discouraged.

     * They are not Y2038-safe on a 32-bit system, and have no timezone info.

     *

     * @param float|int|string $unixTimestamp Unix Timestamp

     *

     * @return false|float MS Excel serialized date/time value

     */

    public static function timestampToExcel($unixTimestamp)

    {

        if (!is_numeric($unixTimestamp)) {

            return false;

        }

        return self::dateTimeToExcel(new DateTime('@' . $unixTimestamp));

    }

    /**

     * formattedPHPToExcel.

     *

     * @param int $year

     * @param int $month

     * @param int $day

     * @param int $hours

     * @param int $minutes

     * @param int $seconds

     *

     * @return float Excel date/time value

     */

    public static function formattedPHPToExcel($year, $month, $day, $hours = 0, $minutes = 0, $seconds = 0)

    {

        if (self::$excelCalendar == self::CALENDAR_WINDOWS_1900) {

            //

            //    Fudge factor for the erroneous fact that the year 1900 is treated as a Leap Year in MS Excel

            //    This affects every date following 28th February 1900

            //

            $excel1900isLeapYear = true;

            if (($year == 1900) && ($month <= 2)) {

                $excel1900isLeapYear = false;

            }

            $myexcelBaseDate = 2415020;

        } else {

            $myexcelBaseDate = 2416481;

            $excel1900isLeapYear = false;

        }

        //    Julian base date Adjustment

        if ($month > 2) {

            $month -= 3;

        } else {

            $month += 9;

            --$year;

        }

        //    Calculate the Julian Date, then subtract the Excel base date (JD 2415020 = 31-Dec-1899 Giving Excel Date of 0)

        $century = (int) substr((string) $year, 0, 2);

        $decade = (int) substr((string) $year, 2, 2);

        $excelDate = floor((146097 * $century) / 4) + floor((1461 * $decade) / 4) + floor((153 * $month + 2) / 5) + $day + 1721119 - $myexcelBaseDate + $excel1900isLeapYear;

        $excelTime = (($hours * 3600) + ($minutes * 60) + $seconds) / 86400;

        return (float) $excelDate + $excelTime;

    }

    /**

     * Is a given cell a date/time?

     *

     * @param mixed $value

     *

     * @return bool

     */

    public static function isDateTime(Cell $cell, $value = null, bool $dateWithoutTimeOkay = true)

    {

        $result = false;

        $worksheet = $cell->getWorksheetOrNull();

        $spreadsheet = ($worksheet === null) ? null : $worksheet->getParent();

        if ($worksheet !== null && $spreadsheet !== null) {

            $index = $spreadsheet->getActiveSheetIndex();

            $selected = $worksheet->getSelectedCells();

            try {

                $result = is_numeric($value ?? $cell->getCalculatedValue()) &&

                    self::isDateTimeFormat(

                        $worksheet->getStyle(

                            $cell->getCoordinate()

                        )->getNumberFormat(),

                        $dateWithoutTimeOkay

                    );

            } catch (Exception $e) {

                // Result is already false, so no need to actually do anything here

            }

            $worksheet->setSelectedCells($selected);

            $spreadsheet->setActiveSheetIndex($index);

        }

        return $result;

    }

    /**

     * Is a given NumberFormat code a date/time format code?

     *

     * @return bool

     */

    public static function isDateTimeFormat(NumberFormat $excelFormatCode, bool $dateWithoutTimeOkay = true)

    {

        return self::isDateTimeFormatCode((string) $excelFormatCode->getFormatCode(), $dateWithoutTimeOkay);

    }

    private const POSSIBLE_DATETIME_FORMAT_CHARACTERS = 'eymdHs';

    private const POSSIBLE_TIME_FORMAT_CHARACTERS = 'Hs'; // note - no 'm' due to ambiguity

    /**

     * Is a given number format code a date/time?

     *

     * @param string $excelFormatCode

     *

     * @return bool

     */

    public static function isDateTimeFormatCode($excelFormatCode, bool $dateWithoutTimeOkay = true)

    {

        if (strtolower($excelFormatCode) === strtolower(NumberFormat::FORMAT_GENERAL)) {

            //    "General" contains an epoch letter 'e', so we trap for it explicitly here (case-insensitive check)

            return false;

        }

        if (preg_match('/[0#]E[+-]0/i', $excelFormatCode)) {

            //    Scientific format

            return false;

        }

        // Switch on formatcode

        if (in_array($excelFormatCode, NumberFormat::DATE_TIME_OR_DATETIME_ARRAY, true)) {

            return $dateWithoutTimeOkay || in_array($excelFormatCode, NumberFormat::TIME_OR_DATETIME_ARRAY);

        }

        //    Typically number, currency or accounting (or occasionally fraction) formats

        if ((substr($excelFormatCode, 0, 1) == '_') || (substr($excelFormatCode, 0, 2) == '0 ')) {

            return false;

        }

        // Some "special formats" provided in German Excel versions were detected as date time value,

        // so filter them out here - "\C\H\-00000" (Switzerland) and "\D-00000" (Germany).

        if (\strpos($excelFormatCode, '-00000') !== false) {

            return false;

        }

        $possibleFormatCharacters = $dateWithoutTimeOkay ? self::POSSIBLE_DATETIME_FORMAT_CHARACTERS : self::POSSIBLE_TIME_FORMAT_CHARACTERS;

        // Try checking for any of the date formatting characters that don't appear within square braces

        if (preg_match('/(^|\])[^\[]*[' . $possibleFormatCharacters . ']/i', $excelFormatCode)) {

            //    We might also have a format mask containing quoted strings...

            //        we don't want to test for any of our characters within the quoted blocks

            if (strpos($excelFormatCode, '"') !== false) {

                $segMatcher = false;

                foreach (explode('"', $excelFormatCode) as $subVal) {

                    //    Only test in alternate array entries (the non-quoted blocks)

                    $segMatcher = $segMatcher === false;

                    if (

                        $segMatcher &&

                        (preg_match('/(^|\])[^\[]*[' . $possibleFormatCharacters . ']/i', $subVal))

                    ) {

                        return true;

                    }

                }

                return false;

            }

            return true;

        }

        // No date...

        return false;

    }

    /**

     * Convert a date/time string to Excel time.

     *

     * @param string $dateValue Examples: '2009-12-31', '2009-12-31 15:59', '2009-12-31 15:59:10'

     *

     * @return false|float Excel date/time serial value

     */

    public static function stringToExcel($dateValue)

    {

        if (strlen($dateValue) < 2) {

            return false;

        }

        if (!preg_match('/^(\d{1,4}[ \.\/\-][A-Z]{3,9}([ \.\/\-]\d{1,4})?|[A-Z]{3,9}[ \.\/\-]\d{1,4}([ \.\/\-]\d{1,4})?|\d{1,4}[ \.\/\-]\d{1,4}([ \.\/\-]\d{1,4})?)( \d{1,2}:\d{1,2}(:\d{1,2})?)?$/iu', $dateValue)) {

            return false;

        }

        $dateValueNew = DateTimeExcel\DateValue::fromString($dateValue);

        if (!is_float($dateValueNew)) {

            return false;

        }

        if (strpos($dateValue, ':') !== false) {

            $timeValue = DateTimeExcel\TimeValue::fromString($dateValue);

            if (!is_float($timeValue)) {

                return false;

            }

            $dateValueNew += $timeValue;

        }

        return $dateValueNew;

    }

    /**

     * Converts a month name (either a long or a short name) to a month number.

     *

     * @param string $monthName Month name or abbreviation

     *

     * @return int|string Month number (1 - 12), or the original string argument if it isn't a valid month name

     */

    public static function monthStringToNumber($monthName)

    {

        $monthIndex = 1;

        foreach (self::$monthNames as $shortMonthName => $longMonthName) {

            if (($monthName === $longMonthName) || ($monthName === $shortMonthName)) {

                return $monthIndex;

            }

            ++$monthIndex;

        }

        return $monthName;

    }

    /**

     * Strips an ordinal from a numeric value.

     *

     * @param string $day Day number with an ordinal

     *

     * @return int|string The integer value with any ordinal stripped, or the original string argument if it isn't a valid numeric

     */

    public static function dayStringToNumber($day)

    {

        $strippedDayValue = (str_replace(self::$numberSuffixes, '', $day));

        if (is_numeric($strippedDayValue)) {

            return (int) $strippedDayValue;

        }

        return $day;

    }

    public static function dateTimeFromTimestamp(string $date, ?DateTimeZone $timeZone = null): DateTime

    {

        $dtobj = DateTime::createFromFormat('U', $date) ?: new DateTime();

        $dtobj->setTimeZone($timeZone ?? self::getDefaultOrLocalTimezone());

        return $dtobj;

    }

    public static function formattedDateTimeFromTimestamp(string $date, string $format, ?DateTimeZone $timeZone = null): string

    {

        $dtobj = self::dateTimeFromTimestamp($date, $timeZone);

        return $dtobj->format($format);

    }

}