<?php

declare(strict_types=1);

use App\Core\View;

function app_env(string $key, ?string $default = null): ?string
{
    $value = $_ENV[$key] ?? getenv($key);

    if ($value === false || $value === null) {
        return $default;
    }

    return (string) $value;
}

function base_path(string $path = ''): string
{
    $base = dirname(__DIR__);

    return $path === '' ? $base : $base . '/' . ltrim($path, '/');
}

function versioned_asset(string $path): string
{
    $assetPath = '/' . ltrim($path, '/');
    $pathWithoutQuery = strtok($assetPath, '?') ?: $assetPath;
    $querySeparator = str_contains($assetPath, '?') ? '&' : '?';
    $publicPath = base_path('public' . $pathWithoutQuery);

    if (!is_file($publicPath)) {
        return $assetPath;
    }

    return $assetPath . $querySeparator . filemtime($publicPath);
}

function view(string $template, array $data = []): void
{
    View::render($template, $data);
}

function e(?string $value): string
{
    return htmlspecialchars((string) $value, ENT_QUOTES, 'UTF-8');
}

function unit_label(?string $unit): string
{
    return match ((string) $unit) {
        'kg' => 'кг',
        'g' => 'г',
        'l' => 'л',
        'ml' => 'мл',
        'pcs' => 'шт.',
        default => (string) ($unit ?: 'ед.'),
    };
}

function text_lower(string $value): string
{
    if (function_exists('mb_strtolower')) {
        return mb_strtolower($value, 'UTF-8');
    }

    return strtolower(strtr($value, [
        'А' => 'а', 'Б' => 'б', 'В' => 'в', 'Г' => 'г', 'Д' => 'д',
        'Е' => 'е', 'Ё' => 'ё', 'Ж' => 'ж', 'З' => 'з', 'И' => 'и',
        'Й' => 'й', 'К' => 'к', 'Л' => 'л', 'М' => 'м', 'Н' => 'н',
        'О' => 'о', 'П' => 'п', 'Р' => 'р', 'С' => 'с', 'Т' => 'т',
        'У' => 'у', 'Ф' => 'ф', 'Х' => 'х', 'Ц' => 'ц', 'Ч' => 'ч',
        'Ш' => 'ш', 'Щ' => 'щ', 'Ъ' => 'ъ', 'Ы' => 'ы', 'Ь' => 'ь',
        'Э' => 'э', 'Ю' => 'ю', 'Я' => 'я',
    ]));
}

/**
 * Price per kg helps with boxes and weight products, but confuses customers on
 * caviar, cans, sauces, spices and small consumer packs. In those cases the
 * storefront should sell by package and avoid derived kg prices.
 *
 * @param array<string, mixed> $product
 * @param array<string, mixed> $variant
 */
function product_should_show_unit_price(array $product, array $variant): bool
{
    $unit = (string) ($variant['unit'] ?? $product['base_unit'] ?? '');
    $unitLabel = unit_label($unit);

    if (!in_array($unit, ['kg', 'кг'], true) && $unitLabel !== 'кг') {
        return false;
    }

    if (($variant['price_per_unit'] ?? null) === null || (float) $variant['price_per_unit'] <= 0) {
        return false;
    }

    $packageQuantity = (float) ($variant['package_quantity'] ?? 0);
    if ($packageQuantity <= 0) {
        return false;
    }

    if ($packageQuantity < 1) {
        return false;
    }

    $variantName = text_lower((string) ($variant['name'] ?? ''));
    if (preg_match('/(^|[\s,.;])\d+(?:[.,]\d+)?\s*(мл|шт)\.?($|[\s,.;])/u', $variantName) === 1) {
        return false;
    }

    return true;
}

function money_label(mixed $value): string
{
    if ($value === null || $value === '') {
        return '';
    }

    $number = (float) $value;
    $formatted = abs($number - round($number)) < 0.005
        ? number_format($number, 0, ',', ' ')
        : number_format($number, 2, ',', ' ');

    return $formatted . ' руб.';
}