<?php

namespace App\Helpers;

use Morilog\Jalali\Jalalian;

class JalaliHelper
{
    /**
     * Convert a Gregorian date to Jalali.
     */
    public static function toJalali(int $year, int $month, int $day): array
    {
        return Jalalian::fromGregorian($year, $month, $day)->toArray();
    }

    /**
     * Convert a Jalali date to Gregorian.
     */
    public static function toGregorian(int $year, int $month, int $day): array
    {
        return (new Jalalian($year, $month, $day))->toGregorian()->toArray();
    }

    /**
     * Format a Gregorian date string as Jalali.
     */
    public static function formatJalali(string $date, string $format = 'Y/m/d'): string
    {
        if (empty($date)) {
            return '';
        }

        return Jalalian::fromDateTime($date)->format($format);
    }

    /**
     * Get the Jalali month name.
     */
    public static function jalaliMonthName(int $month): string
    {
        $months = [
            1  => 'فروردین',
            2  => 'اردیبهشت',
            3  => 'خرداد',
            4  => 'تیر',
            5  => 'مرداد',
            6  => 'شهریور',
            7  => 'مهر',
            8  => 'آبان',
            9  => 'آذر',
            10 => 'دی',
            11 => 'بهمن',
            12 => 'اسفند',
        ];

        return $months[$month] ?? '';
    }

    /**
     * Get the Jalali day (week) name.
     */
    public static function jalaliDayName(int $dayOfWeek): string
    {
        $days = [
            0 => 'یکشنبه',
            1 => 'دوشنبه',
            2 => 'سه‌شنبه',
            3 => 'چهارشنبه',
            4 => 'پنجشنبه',
            5 => 'جمعه',
            6 => 'شنبه',
        ];

        return $days[$dayOfWeek] ?? '';
    }

    /**
     * Get today's date in Jalali as a formatted string.
     */
    public static function todayJalali(string $format = 'Y/m/d'): string
    {
        return Jalalian::now()->format($format);
    }

    /**
     * Format a date for display based on the user's calendar preference.
     */
    public static function formatDateForDisplay(?string $date, string $calendar = 'jalali', string $format = 'Y/m/d'): string
    {
        if (empty($date)) {
            return '';
        }

        if ($calendar === 'jalali') {
            return static::formatJalali($date, $format);
        }

        return date($format, strtotime($date));
    }

    /**
     * Get the start and end dates for a given Jalali month as Gregorian Carbon instances.
     * Useful for querying records within a specific Jalali month.
     */
    public static function getQueryRangeForJalaliMonth(int $year, int $month): array
    {
        $start = (new Jalalian($year, $month, 1))->toCarbon();
        $end = (new Jalalian($year, $month, $start->format('t')))->toCarbon()->endOfDay();

        // Jalalian doesn't have daysInMonth directly, calculate it
        $jalaliEndDay = 29;
        if ($month <= 6) {
            $jalaliEndDay = 31;
        } elseif ($month <= 11) {
            $jalaliEndDay = 30;
        } else {
            // Esfand - check for leap year
            $j = new Jalalian($year, 1, 1);
            $jalaliEndDay = $j->isLeapYear() ? 30 : 29;
        }

        $start = (new Jalalian($year, $month, 1))->toCarbon()->startOfDay();
        $end = (new Jalalian($year, $month, $jalaliEndDay))->toCarbon()->endOfDay();

        return [$start, $end];
    }
}