<?php

namespace Modules\EcommerceFinance\Support;

use Carbon\CarbonImmutable;
use Carbon\CarbonInterface;
use Throwable;

final class OaProcessTime
{
    private const WAIT_STEP_HOURS = 12;

    public static function timezone(): string
    {
        $timezone = trim((string) config('app.platform_timezone', ''));

        return $timezone !== '' ? $timezone : 'Asia/Shanghai';
    }

    public static function now(): CarbonImmutable
    {
        return CarbonImmutable::now(self::timezone());
    }

    public static function parse(mixed $value): ?CarbonImmutable
    {
        $text = trim((string) $value);
        if ($text === '') {
            return null;
        }

        try {
            return CarbonImmutable::parse($text, self::timezone())
                ->setTimezone(self::timezone());
        } catch (Throwable) {
            return null;
        }
    }

    public static function formatDateTime(mixed $value): string
    {
        return self::parse($value)?->format('Y-m-d H:i') ?? '-';
    }

    public static function formatWaiting(mixed $value, ?CarbonInterface $now = null): string
    {
        $startedAt = self::parse($value);
        if ($startedAt === null) {
            return '-';
        }

        $nowAt = $now === null
            ? self::now()
            : CarbonImmutable::instance($now)->setTimezone(self::timezone());
        if ($startedAt->greaterThan($nowAt)) {
            return '-';
        }

        $hours = intdiv($startedAt->diffInSeconds($nowAt), 3600);
        $steps = intdiv($hours, self::WAIT_STEP_HOURS);
        if ($steps < 1) {
            return '不足12小时';
        }

        $days = intdiv($steps, 2);
        $halfDays = $steps % 2;
        $parts = [];
        if ($days > 0) {
            $parts[] = $days . '天';
        }
        if ($halfDays > 0) {
            $parts[] = self::WAIT_STEP_HOURS . '小时';
        }

        return implode('', $parts);
    }
}