<?php

declare(strict_types=1);

namespace GerSync;

defined('ABSPATH') || exit;

/**
 * Доступ к настройкам плагина (одна опция-массив).
 */
final class Settings
{
    public const OPTION = 'gersync_settings';

    /** Режимы атрибутов: синхронизировать с 1С / только добавлять / не трогать у существующих товаров. */
    public const ATTRIBUTE_MODES = ['sync', 'merge', 'none'];

    /** Что делать с товарами, которых нет в полной выгрузке. */
    public const MISSING_ACTIONS = ['none', 'draft', 'outofstock', 'trash'];

    public const DEFAULTS = [
        'enabled'               => true,
        'login'                 => '',
        'password_hash'         => '',
        'allowed_ips'           => '',
        'time_limit'            => 20,
        'file_limit_mb'         => 32,
        'use_zip'               => true,
        'response_charset'      => 'cp1251',
        'skip_unchanged'        => true,
        'image_sizes'           => 'all',

        'new_status'            => 'publish',
        'match_by_sku'          => false,
        'update_name'           => true,
        'update_description'    => true,
        'update_categories'     => true,
        'update_images'         => true,
        'update_sku'            => true,
        'update_weight'         => true,
        'update_price'          => true,
        'update_stock'          => true,
        'attributes_mode'       => 'sync',
        'import_attributes'     => true,
        'deleted_action'        => 'draft',
        'missing_action'        => 'none',

        'price_type'            => '',
        'sale_price_type'       => '',
        'manage_stock'          => true,

        'orders_enabled'        => true,
        'order_statuses'        => ['processing', 'on-hold', 'completed', 'cancelled'],
        'order_import_statuses' => false,
        'order_currency'        => '',

        'debug'                 => false,
    ];

    private static ?array $cache = null;

    public static function all(): array
    {
        if (self::$cache === null) {
            $stored = get_option(self::OPTION, []);
            $stored = is_array($stored) ? $stored : [];
            // Версия 1.1 хранила галочку update_attributes вместо режима.
            if (!isset($stored['attributes_mode']) && array_key_exists('update_attributes', $stored)) {
                $stored['attributes_mode'] = $stored['update_attributes'] ? 'sync' : 'none';
            }
            self::$cache = array_merge(self::DEFAULTS, $stored);
        }
        return self::$cache;
    }

    public static function get(string $key): mixed
    {
        return self::all()[$key] ?? null;
    }

    public static function bool(string $key): bool
    {
        return (bool) self::get($key);
    }

    public static function int(string $key): int
    {
        return (int) self::get($key);
    }

    public static function str(string $key): string
    {
        return trim((string) self::get($key));
    }

    public static function flush(): void
    {
        self::$cache = null;
    }

    /**
     * Очистка данных из формы настроек.
     */
    public static function sanitize(mixed $input): array
    {
        $input = is_array($input) ? $input : [];
        $old   = self::all();
        $out   = [];

        foreach (['enabled', 'use_zip', 'match_by_sku', 'update_name', 'update_description', 'update_categories',
                  'update_images', 'update_sku', 'update_weight', 'update_price', 'update_stock',
                  'import_attributes', 'manage_stock', 'orders_enabled', 'order_import_statuses', 'debug',
                  'skip_unchanged'] as $key) {
            $out[$key] = !empty($input[$key]);
        }

        $out['login'] = sanitize_user((string) ($input['login'] ?? ''), true);

        // Пароль хранится только в виде хеша. Пустое поле = оставить прежний.
        $password             = (string) ($input['password'] ?? '');
        // (WP может вызвать sanitize дважды при первом сохранении — тогда хеш уже лежит в $input.)
        $out['password_hash'] = $password !== ''
            ? wp_hash_password($password)
            : (string) ($input['password_hash'] ?? $old['password_hash']);

        $ips = [];
        foreach (preg_split('/[\s,;]+/', (string) ($input['allowed_ips'] ?? ''), -1, PREG_SPLIT_NO_EMPTY) as $ip) {
            if (filter_var($ip, FILTER_VALIDATE_IP)) {
                $ips[] = $ip;
            }
        }
        $out['allowed_ips'] = implode("\n", array_unique($ips));

        $out['time_limit']    = max(5, min(120, (int) ($input['time_limit'] ?? 20)));
        $out['file_limit_mb'] = max(1, min(512, (int) ($input['file_limit_mb'] ?? 32)));

        $out['new_status']     = self::choice($input, 'new_status', ['publish', 'draft', 'pending', 'private'], 'publish');
        $out['deleted_action'] = self::choice($input, 'deleted_action', ['draft', 'trash', 'none'], 'draft');
        $out['missing_action'] = self::choice($input, 'missing_action', self::MISSING_ACTIONS, 'none');
        $out['attributes_mode'] = self::choice($input, 'attributes_mode', self::ATTRIBUTE_MODES, 'sync');
        $out['response_charset'] = self::choice($input, 'response_charset', ['cp1251', 'utf-8'], 'cp1251');
        $out['image_sizes']      = self::choice($input, 'image_sizes', ['all', 'woo'], 'all');

        $out['price_type']      = sanitize_text_field((string) ($input['price_type'] ?? ''));
        $out['sale_price_type'] = sanitize_text_field((string) ($input['sale_price_type'] ?? ''));
        $out['order_currency']  = sanitize_text_field((string) ($input['order_currency'] ?? ''));

        $allowed               = array_map(static fn(string $s): string => substr($s, 3), array_keys(wc_get_order_statuses()));
        $statuses              = array_map('sanitize_key', (array) ($input['order_statuses'] ?? []));
        $out['order_statuses'] = array_values(array_intersect($statuses, $allowed));

        self::$cache = null;
        return $out;
    }

    /**
     * @param list<string> $allowed
     */
    private static function choice(array $input, string $key, array $allowed, string $default): string
    {
        $value = (string) ($input[$key] ?? '');
        return in_array($value, $allowed, true) ? $value : $default;
    }
}