<?php

namespace OCA\Gestion\Helpers;

use DateTime;
use DateTimeZone;
use Exception;
use IntlDateFormatter;

class DateHelpers
{
    public static function isWeekend(string $dateString): bool
    {
        try {
            $date = new DateTime($dateString);
            $dayOfWeek = $date->format('N');
            return in_array($dayOfWeek, [6, 7]);
        } catch (Exception $e) {
            // Handle invalid date strings
            return false;
        }
    }

    public static function GetMonthPlainString($month){
        $formatter = new IntlDateFormatter(
            'fr_FR',
            IntlDateFormatter::FULL,
            IntlDateFormatter::NONE,
            null,
            null,
            'MMMM'
        );
        
        $date = DateTime::createFromFormat('!m', $month);
        $monthString = strtoupper($formatter->format($date));
        $normalizedMonth = mb_convert_case($monthString, MB_CASE_UPPER, "UTF-8");
        
        return $normalizedMonth;
    }

    public static function GetDateWithFormatDayAndMonthPlainString(string $date){
        $dateTime = new DateTime($date);
        $formattedDate = $dateTime->format('d F');
        $formattedDate = str_replace(
            array('January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'),
            array('JANVIER', 'FEVRIER', 'MARS', 'AVRIL', 'MAI', 'JUIN', 'JUILLET', 'AOUT', 'SEPTEMBRE', 'OCTOBRE', 'NOVEMBRE', 'DECEMBRE'),
            $formattedDate
        );

        return $formattedDate;
    }

    public static function GetFullFactureOrDevisNumberByDate($date,$devisNumber,$prefix){
        $year = $date->format('y');
        $month = $date->format('m');
        $devisNumber = str_pad($devisNumber, 2, '0', STR_PAD_LEFT);
        $devisNumber = $prefix . $year . $month . $devisNumber;
        return $devisNumber;
    }

    public static function GetLastDayOfTheMonthOfADate($datetime){
        $datetime->modify('last day of this month');
        $lastDay = $datetime;
        return $lastDay;
    }

    public static function getDaysCountInAMonthAndYear($month,$year){
        return $month == 2 ? ($year % 4 ? 28 : ($year % 100 ? 29 : ($year % 400 ? 28 : 29))) : (($month - 1) % 7 % 2 ? 30 : 31);
    }

    public static function getDatesOfMonth($year, $month) {
        $dates = [];
        $daysInMonth = self::getDaysCountInAMonthAndYear($month, $year);
        
        for ($day = 1; $day <= $daysInMonth; $day++) {
            $dateString = sprintf("%04d-%02d-%02d", $year, $month, $day);
            $dates[] = new DateTime($dateString);
        }
    
        return $dates;
    }

    public static function isPublicHoliday(string $dateString): bool
    {
        try {
            $date = new DateTime($dateString);
            $dayOfWeek = $date->format('N');
            return $dayOfWeek == 7;
        } catch (Exception $e) {
            return false;
        }
    }

    public static function getPublicHolidayText($isPublicHoliday){
        return $isPublicHoliday ? "Ferie" : "J";
    }

    public static function getHoursBetweenTwoDatetime($datetimeEnd,$datetimeStart){
        if($datetimeEnd == null || $datetimeStart == null){
            return 0;
        }
        $interval = $datetimeStart->diff($datetimeEnd);
        $hours = $interval->h + ($interval->days * 24) + ($interval->i / 60);
        return $hours;
    }

    public static function GetWorkingHoursBetweenDatetimeEndAndDatetimeStart(Datetime|null  $datetimeEnd,Datetime|null $datetimeStart){
        if($datetimeEnd == null || $datetimeStart == null){
            return 0;
        }
        $workingStartAM = new DateTime($datetimeStart->format('Y-m-d') . ' 08:00',$datetimeStart->getTimezone());
        $workingEndAM = new DateTime($datetimeStart->format('Y-m-d') . ' 12:00',$datetimeStart->getTimezone()); 
        $workingStartPM = new DateTime($datetimeStart->format('Y-m-d') . ' 13:00',$datetimeStart->getTimezone());
        $workingEndPM = new DateTime($datetimeStart->format('Y-m-d') . ' 17:00',$datetimeStart->getTimezone()); 
        $totalHours = 0;
        if ($datetimeStart->format('N') < 7) {
            $dayStartAM = max($datetimeStart, $workingStartAM);
            $dayEndAM = min($datetimeEnd, $workingEndAM);        
            if ($dayStartAM < $dayEndAM) {
                $totalHours += ($dayEndAM->getTimestamp() - $dayStartAM->getTimestamp()) / 3600;
            }
            $dayStartPM = max($datetimeStart, $workingStartPM);
            $dayEndPM = min($datetimeEnd, $workingEndPM);        
            if ($dayStartPM < $dayEndPM) {
                $totalHours += ($dayEndPM->getTimestamp() - $dayStartPM->getTimestamp()) / 3600;
            }
        }
        else{
            $totalHours = ($datetimeEnd->getTimestamp() - $datetimeStart->getTimestamp()) / 3600;
        }
        return $totalHours;
    }

}