<?php

namespace app\common\utils\crawl\service\service;

use app\common\model\UsedcarCrawlResultsImages;
use app\common\service\UploadService;
use GuzzleHttp\Client;
use GuzzleHttp\Exception\GuzzleException;
use QL\QueryList;
use support\Redis;
use support\Db;
use support\exception\BusinessException;
use Throwable;

class UsedCarCrawl
{
    // 默认请求头
    private const DEFAULT_HEADERS = [
        'User-Agent'      => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
        'Accept-Language' => 'zh-CN,zh;q=0.9',
        'Referer'         => 'https://www.dongchedi.com/',
    ];

    // Redis队列键名
    private const REDIS_QUEUE_KEY = 'usedcar:urls';

    // 能源类型常量
    public const ENERGY_TYPE_RENEWABLE   = 'RE';
    public const ENERGY_TYPE_CONVENTIONAL = 'CE';
    public const ENERGY_TYPE_UNKNOWN     = 'UNKNOWN';

    /**
     * 插入队列url
     *
     * @param string $url   URL地址
     * @param string $scene 场景：usedcar(二手信息) config(配置信息)
     * @param int    $id    记录ID
     * @return int
     */
    public function pushUrl(string $url = '', string $scene = 'usedcar', int $id = 0): int
    {
        $data = [
            'scene' => $scene,
            'url'   => $url,
            'id'    => $id,
        ];

        return Redis::lpush(
            self::REDIS_QUEUE_KEY,
            json_encode($data, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES)
        );
    }

    /**
     * 获取队列url
     *
     * @return array|null
     * @throws BusinessException
     */
    public function popUrl(): ?array
    {
        $data = Redis::rPop(self::REDIS_QUEUE_KEY);
        if (!$data) {
            return null;
        }

        $task = json_decode($data, true);
        if (json_last_error() !== JSON_ERROR_NONE || !is_array($task)) {
            throw new BusinessException('任务数据解析失败：' . json_last_error_msg());
        }

        // 基本字段校验
        if (empty($task['url']) || empty($task['scene'])) {
            throw new BusinessException('队列任务数据缺少必要字段：url 或 scene');
        }

        return $task;
    }

    /**
     * 执行抓取任务
     *
     * @return bool
     * @throws BusinessException
     */
    public function execute(): bool
    {
        try {
            $task = $this->popUrl();

            if (!$task) {
                // 队列为空，任务结束
                return false;
            }

            $url   = (string)$task['url'];
            $scene = (string)$task['scene'];
            $id    = (int)($task['id'] ?? 0);

            $html = $this->fetchHtml($url);
            if ($html === '') {
                throw new BusinessException("页面内容为空: {$url}");
            }

            switch ($scene) {
                case 'usedcar':
                    $info = $this->parseUsedCarDetail($html, $url);
                    $insertId = $this->saveUsedCarBasicInfo($info);

                    // 下载图片 + 上传 + 入库（图片失败不影响主记录）
                    $imagesArray = json_decode($info['images'] ?? '[]', true);
                    if (json_last_error() !== JSON_ERROR_NONE) {
                        $imagesArray = [];
                    }
                    $saveDir = public_path('uploads/usedcar/' . $insertId);
                    $this->uploadAndRemove($imagesArray, $saveDir, $info['used_car_id'], $insertId);

                    // 继续派发配置页任务
                    if (!empty($info['car_id_url'])) {
                        $this->pushUrl($info['car_id_url'], 'config', $insertId);
                    }
                    break;

                case 'config':
                    if ($id <= 0) {
                        throw new BusinessException("配置任务缺少主记录ID");
                    }

                    $data = $this->parseConfigDetail($html);
                    $this->saveUsedCarConfigInfo($data, $id);
                    break;

                default:
                    throw new BusinessException("未知的任务场景: " . $scene);
            }

            return true;
        } catch (GuzzleException $e) {
            throw new BusinessException("网络请求失败: " . $e->getMessage());
        } catch (BusinessException $e) {
            // 业务异常原样抛出，方便上层知道是逻辑问题
            throw $e;
        } catch (Throwable $th) {
            // 兜底异常，避免 worker 直接挂掉
            throw new BusinessException(
                "执行任务出错: " . $th->getMessage()
                . ' | 行号: ' . $th->getLine()
                . ' | 文件: ' . $th->getFile()
            );
        }
    }

    /**
     * 获取网页HTML内容
     *
     * @param string $url
     * @return string
     * @throws GuzzleException
     */
    public function fetchHtml(string $url): string
    {
        $client   = new Client();
        $response = $client->request('GET', $url, [
            'headers' => self::DEFAULT_HEADERS,
            'timeout' => 10,
        ]);

        return (string)$response->getBody();
    }

    /**
     * 解析二手车详情页信息
     *
     * @param string $html
     * @param string $url
     * @return array
     * @throws BusinessException
     */
    public function parseUsedCarDetail(string $html = '', string $url = ''): array
    {
        try {
            $ql = QueryList::html($html);
        } catch (Throwable $e) {
            throw new BusinessException('解析 HTML 失败（详情页）: ' . $e->getMessage());
        }

        $title    = trim($ql->find('h1')->text());
        $price    = trim($ql->find('.head-info_price-wrap__Y4bxi > p')->text());
        $pageText = $ql->find('body')->text();
        $jsonText = $ql->find('#__NEXT_DATA__')->text();

        if ($jsonText === '') {
            throw new BusinessException('详情页未找到 __NEXT_DATA__ JSON');
        }

        $jsonArray = $this->decodeJson($jsonText, '详情页 __NEXT_DATA__');

        // 车辆相册
        $images = $jsonArray['props']['pageProps']['skuDetail']['head_images'] ?? [];

        // 车辆ID / 年份
        $carInfo = $jsonArray['props']['pageProps']['skuDetail']['car_info'] ?? [];
        $carId   = $carInfo['car_id'] ?? 0;
        $year    = (int)($carInfo['year'] ?? 0);

        // 车辆ID URL
        $carIdUrl = $carId ? ('https://www.dongchedi.com/auto/params-carIds-' . $carId) : '';

        // 能源类型（两个字段择一）
        $overview      = $jsonArray['props']['pageProps']['skuDetail']['car_config_overview'] ?? [];
        $fuelForm      = $overview['power']['fuel_form'] ?? '';
        $newFuelForm   = $overview['new_energy_power']['fuel_form'] ?? '';
        $resultFuelForm = $fuelForm === '' ? $newFuelForm : $fuelForm;

        // 使用里程
        $importantText      = $jsonArray['props']['pageProps']['skuDetail']['important_text'] ?? '';
        $importantTextArray = $importantText ? explode(' | ', $importantText) : [];
        $usageMileage       = '';
        if (isset($importantTextArray[1])) {
            $usageMileage = str_replace('万公里', '', $importantTextArray[1]);
        }

        // 车辆名称 品牌、车系、车型
        $brandName  = $carInfo['brand_name'] ?? '';
        $seriesName = $carInfo['series_name'] ?? '';
        $carName    = $carInfo['car_name'] ?? '';

        // 商家信息
        $shopInfo = $jsonArray['props']['pageProps']['skuDetail']['shop_info'] ?? [];
        $formatShopInfo = [
            'shop_id'      => $shopInfo['shop_id'] ?? 0,
            'shop_name'    => $shopInfo['shop_short_name'] ?? '',
            'shop_address' => $shopInfo['shop_address'] ?? '',
        ];

        // 简介参数
        $otherParams = $jsonArray['props']['pageProps']['skuDetail']['other_params'] ?? [];
        $displacement = $this->getParamValue($otherParams, '排量');
        $gearbox      = $this->getParamValue($otherParams, '变速箱');

        $formatCarInfo = [
            'displacement' => $displacement,
            'gearbox'      => $gearbox,
        ];

        // 提取新车指导价 / 比新车省金额
        $newPrice        = $this->extractPatternValue($pageText, '/新车指导价[:：]\s*([^\r\n万]*万)/u');
        $priceDifference = $this->extractPatternValue($pageText, '/比新车省[:：]\s*([^\r\n万]*万)/u');

        // 提取车况介绍
        $conditionDesc = '';
        if ($pageText && preg_match('/车况介绍\s*(.*?)\s*推荐理由/su', $pageText, $m)) {
            $conditionDesc = trim($m[1]);
        }

        return [
            'used_car_id'       => $this->extractIdFromUrl($url),
            'car_id'            => $carId,
            'url'               => $url,
            'title'             => $title,
            'price'             => str_replace('万', '', $this->decodePrice($price)),
            'new_price'         => str_replace('万', '', $newPrice),
            'price_difference'  => str_replace('万', '', $priceDifference),
            'condition_desc'    => $conditionDesc,
            'images'            => json_encode($images, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES),
            'car_id_url'        => $carIdUrl,
            'used_detail'       => $jsonText,
            'format_shop_info'  => json_encode($formatShopInfo, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES),
            'fuel_form'         => $resultFuelForm,
            'classify_energy'   => $this->detectEnergyType($resultFuelForm),
            'usage_mileage'     => $usageMileage,
            'brand_name'        => $brandName,
            'series_name'       => $seriesName,
            'car_name'          => $carName,
            'year'              => $year,
            'format_car_info'   => json_encode($formatCarInfo, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES),
        ];
    }

    /**
     * 解析配置详情页信息
     *
     * @param string $html
     * @return array
     * @throws BusinessException
     */
    public function parseConfigDetail(string $html = ''): array
    {
        try {
            $ql = QueryList::html($html);
        } catch (Throwable $e) {
            throw new BusinessException('解析 HTML 失败（配置页）: ' . $e->getMessage());
        }

        $jsonText = $ql->find('#__NEXT_DATA__')->text();
        if ($jsonText === '') {
            throw new BusinessException('配置页未找到 __NEXT_DATA__ JSON');
        }

        $raw = $this->decodeJson($jsonText, '配置页 __NEXT_DATA__');

        $properties = $raw['props']['pageProps']['rawData']['properties'] ?? [];
        $carInfo    = $raw['props']['pageProps']['rawData']['car_info'][0] ?? [];

        $valuesMap = $this->buildValuesMap($carInfo);
        $groups    = $this->buildCarSpecGroups($properties, $valuesMap);

        return [
            'format_car_info' => [
                'market_time'               => $this->getFieldValue($groups, 'market_time'),               // 上市时间
                'driver_form'               => $this->getFieldValue($groups, 'driver_form'),               // 驱动形式
                'seat_count'                => $this->getFieldValue($groups, 'seat_count'),                // 座位数
                'engine_description'        => $this->getFieldValue($groups, 'engine_description'),        // 发动机
                'engine_max_power_horsepower' => $this->getFieldValue($groups, 'engine_max_power_horsepower'), // 发动机最大功率
                'electric_description'      => $this->getFieldValue($groups, 'electric_description'),      // 电动机
                'battery_capacity'          => $this->getFieldValue($groups, 'battery_capacity'),          // 电池容量
                'battery_type'              => $this->getFieldValue($groups, 'battery_type'),              // 电池类型
                'recharge_mileage'          => $this->getFieldValue($groups, 'recharge_mileage'),          // 续航里程
            ],
            'groups' => $groups,
        ];
    }

    /**
     * 从车辆配置中获取能源类型
     *
     * @param array $data JSON数据
     * @return string|null 能源类型
     */
    public function getFuelFormByConfig(array $data): ?string
    {
        if (empty($data[0]['items']) || !is_array($data[0]['items'])) {
            return null;
        }

        foreach ($data[0]['items'] as $item) {
            if (isset($item['key']) && $item['key'] === 'fuel_form') {
                return $item['value'] ?? null;
            }
        }

        return null;
    }

    /**
     * 从数据中根据字段key获取值
     *
     * @param mixed  $data  数据
     * @param string $field 字段名
     * @return string|null
     */
    public function getFieldValue($data, string $field): ?string
    {
        if (is_string($data)) {
            $data = json_decode($data, true);
            if (json_last_error() !== JSON_ERROR_NONE) {
                return null;
            }
        }

        if (!is_array($data)) {
            return null;
        }

        foreach ($data as $group) {
            if (isset($group['items']) && is_array($group['items'])) {
                foreach ($group['items'] as $item) {
                    if (($item['key'] ?? null) === $field) {
                        return $item['value'] ?? null;
                    }

                    if (!empty($item['children']) && is_array($item['children'])) {
                        foreach ($item['children'] as $child) {
                            if (($child['key'] ?? null) === $field) {
                                return $child['value'] ?? null;
                            }
                        }
                    }
                }
            }
        }

        return null;
    }

    /**
     * 从参数列表中获取指定名称的值
     */
    public function getParamValue(array $params, string $name): ?string
    {
        foreach ($params as $item) {
            if (($item['name'] ?? null) === $name) {
                return $item['value'] ?? null;
            }
        }
        return null;
    }

    /**
     * 判断车辆能源类型
     */
    public function detectEnergyType(string $text): string
    {
        if (function_exists('mb_internal_encoding')) {
            mb_internal_encoding('UTF-8');
        }

        // 明确定义的新能源关键字
        $newEnergyKeywords = [
            '纯电', '纯电动', '电动车', 'BEV',
            '插电混动', '插电式混合', '插电式', '插电', 'PHEV',
            '增程式', '增程', 'REEV',
            '氢能', '氢燃料', '燃料电池', 'FCEV',
            '太阳能',
        ];

        // 传统能源关键字
        $traditionalKeywords = [
            '汽油',
            '柴油',
            '天然气', 'LNG', 'CNG',
        ];

        // 普通混动关键字（归为传统能源）
        $hybridKeywords = [
            '油电混合', '油电混动', '油电',
            '混动',
            '双擎',
            'HEV',
        ];

        $contains = function (string $haystack, string $needle): bool {
            if ($needle === '') {
                return false;
            }
            if (function_exists('mb_stripos')) {
                return mb_stripos($haystack, $needle) !== false;
            }
            return stripos($haystack, $needle) !== false;
        };

        foreach ($newEnergyKeywords as $kw) {
            if ($contains($text, $kw)) {
                return self::ENERGY_TYPE_RENEWABLE;
            }
        }

        foreach ($hybridKeywords as $kw) {
            if ($contains($text, $kw)) {
                return self::ENERGY_TYPE_CONVENTIONAL;
            }
        }

        foreach ($traditionalKeywords as $kw) {
            if ($contains($text, $kw)) {
                return self::ENERGY_TYPE_CONVENTIONAL;
            }
        }

        return self::ENERGY_TYPE_UNKNOWN;
    }

    /**
     * 保存二手车基本信息到数据库
     *
     * @param array $data 数据
     * @return int 插入记录ID
     * @throws BusinessException
     */
    public function saveUsedCarBasicInfo(array $data): int
    {
        try {
            $time = time();
            $data['created_at'] = $data['created_at'] ?? $time;
            $data['updated_at'] = $time;

            return (int)Db::table('usedcar_crawl_results')->insertGetId($data);
        } catch (Throwable $e) {
            throw new BusinessException('保存二手车基础信息失败：' . $e->getMessage());
        }
    }

    /**
     * 更新配置信息到数据库
     *
     * @param array $data 配置数据
     * @param int   $id   记录ID
     * @return bool|int
     * @throws BusinessException
     */
    public function saveUsedCarConfigInfo(array $data, int $id)
    {
        try {
            $record = Db::table('usedcar_crawl_results')->find($id);

            if (!$record) {
                // 找不到记录就算了，不抛致命错误，视业务情况也可以抛异常
                return false;
            }

            $groups = $data['groups'] ?? [];
            $oldFormat = [];

            if (!empty($record->format_car_info)) {
                $decoded = json_decode($record->format_car_info, true);
                if (json_last_error() === JSON_ERROR_NONE && is_array($decoded)) {
                    $oldFormat = $decoded;
                }
            }

            $formatCarInfo = array_merge(
                $oldFormat,
                $data['format_car_info'] ?? []
            );

            return Db::table('usedcar_crawl_results')
                ->where('id', $id)
                ->update([
                    'format_car_info' => json_encode($formatCarInfo, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES),
                    'config_detail'   => json_encode($groups, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES),
                    'updated_at'      => time(),
                ]);
        } catch (Throwable $e) {
            throw new BusinessException('保存车辆配置信息失败：' . $e->getMessage());
        }
    }

    /**
     * 构建值映射表
     */
    public function buildValuesMap(array $carInfo): array
    {
        $valuesMap = [];

        // 顶层字段
        foreach ($carInfo as $k => $v) {
            if ($k === 'info' || is_array($v)) {
                continue;
            }
            $valuesMap[$k] = ['value' => $v];
        }

        // info中的配置项
        if (!empty($carInfo['info']) && is_array($carInfo['info'])) {
            foreach ($carInfo['info'] as $k => $v) {
                if (is_array($v) && array_key_exists('value', $v)) {
                    $valuesMap[$k] = $v;
                }
            }
        }

        return $valuesMap;
    }

    /**
     * 构建车辆规格分组
     */
    public function buildCarSpecGroups(array $properties, array $valuesMap): array
    {
        $groups     = [];
        $currentKey = null;

        foreach ($properties as $item) {
            $type    = (int)($item['type'] ?? 1);
            $key     = $item['key'] ?? '';
            $text    = $item['text'] ?? '';
            $subList = $item['sub_list'] ?? null;

            // 分类字段：type = 0 / 2
            if (in_array($type, [0, 2], true)) {
                $currentKey = $key ?: ($text ?: ('group_' . count($groups)));

                if (!isset($groups[$currentKey])) {
                    $groups[$currentKey] = [
                        'group_key'  => $currentKey,
                        'group_text' => $text,
                        'group_type' => $type,
                        'items'      => [],
                    ];
                }

                continue;
            }

            // 普通字段：挂到最近的分类下
            if ($currentKey === null) {
                $currentKey = '_default';
                $groups[$currentKey] = [
                    'group_key'  => '_default',
                    'group_text' => '其他',
                    'group_type' => -1,
                    'items'      => [],
                ];
            }

            $value = '';
            if ($key && isset($valuesMap[$key])) {
                $value = trim((string)($valuesMap[$key]['value'] ?? ''));
            }

            $node = [
                'key'   => $key,
                'text'  => $text,
                'value' => $value,
            ];

            if (is_array($subList) && !empty($subList)) {
                $children = [];
                foreach ($subList as $sub) {
                    $subKey   = $sub['key'] ?? '';
                    $subText  = $sub['text'] ?? '';
                    $subValue = '';

                    if ($subKey && isset($valuesMap[$subKey])) {
                        $subValue = trim((string)($valuesMap[$subKey]['value'] ?? ''));
                    }

                    $children[] = [
                        'key'   => $subKey,
                        'text'  => $subText,
                        'value' => $subValue,
                    ];
                }

                $node['children'] = $children;
            }

            $groups[$currentKey]['items'][] = $node;
        }

        return array_values($groups);
    }

    /**
     * 解码懂车帝价格
     */
    protected function decodePrice(string $str): string
    {
        $map = [
            "\u{E53D}" => '1',
            "\u{E3F0}" => '2',
            "\u{E422}" => '3',
            "\u{E42C}" => '4',
            "\u{E49C}" => '5',
            "\u{E42B}" => '6',
            "\u{E4FE}" => '7',
            "\u{E548}" => '8',
            "\u{E4C8}" => '9',
            "\u{E453}" => '0',
            "\u{E45F}" => '万',
        ];

        return strtr($str, $map);
    }

    /**
     * 从URL中提取ID
     */
    protected function extractIdFromUrl(string $url)
    {
        if (preg_match('/\/(\d+)$/', $url, $matches)) {
            return (int)$matches[1];
        }
        return false;
    }

    /**
     * 提取符合正则表达式的值（只保留数字和小数点）
     */
    protected function extractPatternValue(string $text, string $pattern): string
    {
        $value = '';
        if ($text && preg_match($pattern, $text, $m)) {
            $value = trim(preg_replace('/[^0-9.]/', '', $m[1]));
        }
        return $value;
    }

    /**
     * 下载单张图片
     */
    public function downloadImage(string $url, string $saveDir, ?string $filename = null, array $headers = []): ?string
    {
        if (!is_dir($saveDir)) {
            if (!@mkdir($saveDir, 0777, true) && !is_dir($saveDir)) {
                // echo "[Image] 创建目录失败：{$saveDir}\n";
                return null;
            }
        }

        if ($filename === null) {
            $path = parse_url($url, PHP_URL_PATH);
            $ext  = pathinfo($path ?? '', PATHINFO_EXTENSION);

            if ($ext === '') {
                $ext = 'jpg';
            }

            $filename = md5($url) . '.' . $ext;
        }

        $savePath = rtrim($saveDir, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR . $filename;

        $defaultHeaders = [
            'User-Agent: ' . self::DEFAULT_HEADERS['User-Agent'],
            'Accept: image/avif,image/webp,image/apng,image/*,*/*;q=0.8',
            'Referer: ' . self::DEFAULT_HEADERS['Referer'],
        ];

        foreach ($headers as $h) {
            $defaultHeaders[] = $h;
        }

        $ch = curl_init($url);
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_FOLLOWLOCATION => true,
            CURLOPT_CONNECTTIMEOUT => 5,
            CURLOPT_TIMEOUT        => 15,
            CURLOPT_SSL_VERIFYPEER => false,
            CURLOPT_SSL_VERIFYHOST => false,
            CURLOPT_HTTPHEADER     => $defaultHeaders,
        ]);

        $data  = curl_exec($ch);
        $errNo = curl_errno($ch);
        $code  = (int)curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        if ($errNo !== 0 || $code !== 200 || $data === false || $data === '') {
            return null;
        }

        $bytes = @file_put_contents($savePath, $data);
        if ($bytes === false) {
            return null;
        }

        return $savePath;
    }

    /**
     * 批量下载相册
     *
     * @param array  $urls    图片URL数组
     * @param string $saveDir 保存目录
     * @return array [原始URL => 保存路径或null]
     */
    public function downloadImageAlbum(array $urls, string $saveDir): array
    {
        $result = [];

        foreach ($urls as $url) {
            $url = trim((string)$url);
            if ($url === '') {
                continue;
            }

            if (strpos($url, '//') === 0) {
                $url = 'https:' . $url;
            }

            try {
                $path = $this->downloadImage($url, $saveDir);
            } catch (Throwable $e) {
                $path = null;
            }

            $result[$url] = $path;
        }

        return $result;
    }

    /**
     * 下载 -> 上传 -> 删除本地
     *
     * @param array  $images     原始相册URL列表
     * @param string $path       本地保存目录
     * @param int    $usedCarId  懂车帝 used_car_id
     * @param int    $id         本地 crawl 记录id
     * @return bool
     */
    public function uploadAndRemove(array $images, string $path, $usedCarId, $id): bool
    {
        if (empty($images)) {
            return false;
        }

        // 下载图片
        $filePatch = $this->downloadImageAlbum($images, $path);
        if (empty($filePatch)) {
            return false;
        }

        $uploadService = new UploadService();

        foreach ($filePatch as $url => $filePath) {
            if ($filePath === null) {
                continue;
            }

            try {
                // 上传云端
                $param = [
                    'path'     => $filePath,
                    'scene'    => 'usedcar_crawl',
                    'category' => 'usedcar',
                ];

                $result = $uploadService->uploadLocalFile($param);
                if (empty($result['file_name'])) {
                    // 上传失败则跳过，但不抛异常影响主流程
                    continue;
                }

                // 保存图片信息
                UsedcarCrawlResultsImages::create([
                    'uc_id'        => $id,
                    'used_car_id'  => $usedCarId,
                    'original_name'=> $result['original_name'] ?? '',
                    'file_path'    => $result['file_name'],
                ]);
            } catch (Throwable $e) {
                // 单张图失败不影响其他
                // 可以按需写日志
            } finally {
                // 删除本地文件
                if (is_file($filePath)) {
                    @unlink($filePath);
                }
            }
        }

        // 删除目录
        rmdir($path);

        return true;
    }

    /**
     * 安全解 JSON
     *
     * @param string $json
     * @param string $context
     * @return array
     * @throws BusinessException
     */
    protected function decodeJson(string $json, string $context = 'JSON'): array
    {
        $data = json_decode($json, true);
        if (json_last_error() !== JSON_ERROR_NONE || !is_array($data)) {
            throw new BusinessException($context . ' 解析失败：' . json_last_error_msg());
        }
        return $data;
    }
}