<?php

namespace app\common\controller;

use app\admin\library\Auth;
use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
use think\Config;
use think\Controller;
use think\Db;
use think\exception\DbException;
use think\Hook;
use think\Lang;
use think\Loader;
use think\Model;
use think\Session;
use fast\Tree;
use think\Validate;

/**
 * 后台控制器基类
 */
class Backend extends Controller
{

    /**
     * 无需登录的方法,同时也就不需要鉴权了
     * @var array
     */
    protected $noNeedLogin = [];

    /**
     * 无需鉴权的方法,但需要登录
     * @var array
     */
    protected $noNeedRight = [];

    /**
     * 布局模板
     * @var string
     */
    protected $layout = 'default';

    /**
     * 权限控制类
     * @var Auth
     */
    protected $auth = null;

    /**
     * 模型对象
     * @var \think\Model
     */
    protected $model = null;

    /**
     * 快速搜索时执行查找的字段
     */
    protected $searchFields = 'id';

    /**
     * 是否是关联查询
     */
    protected $relationSearch = false;

    /**
     * 是否开启数据限制
     * 支持auth/personal
     * 表示按权限判断/仅限个人
     * 默认为禁用,若启用请务必保证表中存在admin_id字段
     */
    protected $dataLimit = false;

    /**
     * 数据限制字段
     */
    protected $dataLimitField = 'admin_id';

    /**
     * 数据限制开启时自动填充限制字段值
     */
    protected $dataLimitFieldAutoFill = true;

    /**
     * 是否开启Validate验证
     */
    protected $modelValidate = false;

    /**
     * 是否开启模型场景验证
     */
    protected $modelSceneValidate = false;

    /**
     * Multi方法可批量修改的字段
     */
    protected $multiFields = 'status';

    /**
     * Selectpage可显示的字段
     */
    protected $selectpageFields = '*';

    /**
     * 前台提交过来,需要排除的字段数据
     */
    protected $excludeFields = "";

    /**
     * 导入文件首行类型
     * 支持comment/name
     * 表示注释或字段名
     */
    protected $importHeadType = 'comment';

    /**
     * 引入后台控制器的traits
     */
    use \app\admin\library\traits\Backend;

    public function _initialize()
    {
        $modulename = $this->request->module();
        $controllername = Loader::parseName($this->request->controller());
        $actionname = strtolower($this->request->action());

        $path = str_replace('.', '/', $controllername) . '/' . $actionname;

        // 定义是否Addtabs请求
        !defined('IS_ADDTABS') && define('IS_ADDTABS', (bool)input("addtabs"));

        // 定义是否Dialog请求
        !defined('IS_DIALOG') && define('IS_DIALOG', (bool)input("dialog"));

        // 定义是否AJAX请求
        !defined('IS_AJAX') && define('IS_AJAX', $this->request->isAjax());

        // 检测IP是否允许
        check_ip_allowed();

        $this->auth = Auth::instance();

        // 设置当前请求的URI
        $this->auth->setRequestUri($path);
        // 检测是否需要验证登录
        if (!$this->auth->match($this->noNeedLogin)) {
            //检测是否登录
            if (!$this->auth->isLogin()) {
                Hook::listen('admin_nologin', $this);
                $url = Session::get('referer');
                $url = $url ? $url : $this->request->url();
                if (in_array($this->request->pathinfo(), ['/', 'index/index'])) {
                    $this->redirect('index/login', [], 302, ['referer' => $url]);
                    exit;
                }
                $this->error(__('Please login first'), url('index/login', ['url' => $url]));
            }
            // 判断是否需要验证权限
            if (!$this->auth->match($this->noNeedRight)) {
                // 判断控制器和方法是否有对应权限
                if (!$this->auth->check($path)) {
                    Hook::listen('admin_nopermission', $this);
                    $this->error(__('You have no permission'), '');
                }
            }
        }

        // 非选项卡时重定向
        if (!$this->request->isPost() && !IS_AJAX && !IS_ADDTABS && !IS_DIALOG && input("ref") == 'addtabs') {
            $url = preg_replace_callback("/([\?|&]+)ref=addtabs(&?)/i", function ($matches) {
                return $matches[2] == '&' ? $matches[1] : '';
            }, $this->request->url());
            if (Config::get('url_domain_deploy')) {
                if (stripos($url, $this->request->server('SCRIPT_NAME')) === 0) {
                    $url = substr($url, strlen($this->request->server('SCRIPT_NAME')));
                }
                $url = url($url, '', false);
            }
            $this->redirect('index/index', [], 302, ['referer' => $url]);
            exit;
        }

        // 设置面包屑导航数据
        $breadcrumb = [];
        if (!IS_DIALOG && !config('fastadmin.multiplenav') && config('fastadmin.breadcrumb')) {
            $breadcrumb = $this->auth->getBreadCrumb($path);
            array_pop($breadcrumb);
        }
        $this->view->breadcrumb = $breadcrumb;

        // 如果有使用模板布局
        if ($this->layout) {
            $this->view->engine->layout('layout/' . $this->layout);
        }

        // 语言检测
        $lang = $this->request->langset();
        $lang = preg_match("/^([a-zA-Z\-_]{2,10})\$/i", $lang) ? $lang : 'zh-cn';

        $site = Config::get("site");

        $upload = \app\common\model\Config::upload();

        // 上传信息配置后
        Hook::listen("upload_config_init", $upload);

        // 配置信息
        $config = [
            'site'           => array_intersect_key($site, array_flip(['name', 'indexurl', 'cdnurl', 'version', 'timezone', 'languages'])),
            'upload'         => $upload,
            'modulename'     => $modulename,
            'controllername' => $controllername,
            'actionname'     => $actionname,
            'jsname'         => 'backend/' . str_replace('.', '/', $controllername),
            'moduleurl'      => rtrim(url("/{$modulename}", '', false), '/'),
            'language'       => $lang,
            'referer'        => Session::get("referer")
        ];
        $config = array_merge($config, Config::get("view_replace_str"));

        Config::set('upload', array_merge(Config::get('upload'), $upload));

        // 配置信息后
        Hook::listen("config_init", $config);
        //加载当前控制器语言包
        $this->loadlang($controllername);
        //渲染站点配置
        $this->assign('site', $site);
        //渲染配置信息
        $this->assign('config', $config);
        //渲染权限对象
        $this->assign('auth', $this->auth);
        //渲染管理员对象
        $this->assign('admin', Session::get('admin'));
    }

    /**
     * 加载语言文件
     * @param string $name
     */
    protected function loadlang($name)
    {
        $name = Loader::parseName($name);
        $name = preg_match("/^([a-zA-Z0-9_\.\/]+)\$/i", $name) ? $name : 'index';
        $lang = $this->request->langset();
        $lang = preg_match("/^([a-zA-Z\-_]{2,10})\$/i", $lang) ? $lang : 'zh-cn';
        Lang::load(APP_PATH . $this->request->module() . '/lang/' . $lang . '/' . str_replace('.', '/', $name) . '.php');
    }

    /**
     * 渲染配置信息
     * @param mixed $name  键名或数组
     * @param mixed $value 值
     */
    protected function assignconfig($name, $value = '')
    {
        $this->view->config = array_merge($this->view->config ? $this->view->config : [], is_array($name) ? $name : [$name => $value]);
    }

    /**
     * 生成查询所需要的条件,排序方式
     * @param mixed   $searchfields   快速查询的字段
     * @param boolean $relationSearch 是否关联查询
     * @return array
     */
    protected function buildparams($searchfields = null, $relationSearch = null)
    {
        $searchfields = is_null($searchfields) ? $this->searchFields : $searchfields;
        $relationSearch = is_null($relationSearch) ? $this->relationSearch : $relationSearch;
        $search = $this->request->get("search", '');
        $filter = $this->request->get("filter", '');
        $op = $this->request->get("op", '', 'trim');
        $sort = $this->request->get("sort", !empty($this->model) && $this->model->getPk() ? $this->model->getPk() : 'id');
        $order = $this->request->get("order", "DESC");
        $offset = max(0, $this->request->get("offset/d", 0));
        $limit = max(0, $this->request->get("limit/d", 0));
        $limit = $limit ?: 999999;
        //新增自动计算页码
        $page = $limit ? intval($offset / $limit) + 1 : 1;
        if ($this->request->has("page")) {
            $page = max(0, $this->request->get("page/d", 1));
        }
        $this->request->get([config('paginate.var_page') => $page]);
        $filter = (array)json_decode($filter, true);

        $province_id = $filter['province_id']??null;
        $city_id = $filter['city_id']??null;
        $area_id = $filter['city_id']??null;
        unset($filter['city_id']);
        unset($filter['province_id']);
        unset($filter['area_id']);

        if(!empty($area_id)){
            $filter['area_id'] = $area_id;
        }else{
            if(!empty($city_id)){
                $filter['area_id'] = $city_id;
            }else{
                if(!empty($province_id)){
                    $filter['area_id'] = $province_id;
                }
            }
        }

        $op = (array)json_decode($op, true);
        $filter = $filter ? $filter : [];
        $where = [];
        $alias = [];
        $bind = [];
        $name = '';
        $aliasName = '';
        if (!empty($this->model) && $relationSearch) {
            $name = $this->model->getTable();
            $alias[$name] = Loader::parseName(basename(str_replace('\\', '/', get_class($this->model))));
            $aliasName = $alias[$name] . '.';
        }
        $sortArr = explode(',', $sort);
        foreach ($sortArr as $index => & $item) {
            $item = stripos($item, ".") === false ? $aliasName . trim($item) : $item;
        }
        unset($item);
        $sort = implode(',', $sortArr);
        $adminIds = $this->getDataLimitAdminIds();
        if (is_array($adminIds)) {
            $where[] = [$aliasName . $this->dataLimitField, 'in', $adminIds];
        }
        if ($search) {
            $searcharr = is_array($searchfields) ? $searchfields : explode(',', $searchfields);
            foreach ($searcharr as $k => &$v) {
                $v = stripos($v, ".") === false ? $aliasName . $v : $v;
            }
            unset($v);
            $where[] = [implode("|", $searcharr), "LIKE", "%{$search}%"];
        }
        $index = 0;
        foreach ($filter as $k => $v) {
            if (!preg_match('/^[a-zA-Z0-9_\-\.]+$/', $k)) {
                continue;
            }
            $sym = $op[$k] ?? '=';
            if (stripos($k, ".") === false) {
                $k = $aliasName . $k;
            }
            $v = !is_array($v) ? trim($v) : $v;
            $sym = strtoupper($op[$k] ?? $sym);
            //null和空字符串特殊处理
            if (!is_array($v)) {
                if (in_array(strtoupper($v), ['NULL', 'NOT NULL'])) {
                    $sym = strtoupper($v);
                }
                if (in_array($v, ['""', "''"])) {
                    $v = '';
                    $sym = '=';
                }
            }

            switch ($sym) {
                case '=':
                case '<>':
                    $where[] = [$k, $sym, (string)$v];
                    break;
                case 'LIKE':
                case 'NOT LIKE':
                case 'LIKE %...%':
                case 'NOT LIKE %...%':
                    $where[] = [$k, trim(str_replace('%...%', '', $sym)), "%{$v}%"];
                    break;
                // ✅ 新增：右匹配（like%）
                case 'LIKE%':
                    $where[] = [$k, 'LIKE', "{$v}%"];
                    break;

                // ✅ 新增：左匹配（%like）
                case '%LIKE':
                    $where[] = [$k, 'LIKE', "%{$v}"];
                    break;
                case '>':
                case '>=':
                case '<':
                case '<=':
                    $where[] = [$k, $sym, intval($v)];
                    break;
                case 'FINDIN':
                case 'FINDINSET':
                case 'FIND_IN_SET':
                    $v = is_array($v) ? $v : explode(',', str_replace(' ', ',', $v));
                    $findArr = array_values($v);
                    foreach ($findArr as $idx => $item) {
                        $bindName = "item_" . $index . "_" . $idx;
                        $bind[$bindName] = $item;
                        $where[] = "FIND_IN_SET(:{$bindName}, `" . str_replace('.', '`.`', $k) . "`)";
                    }
                    break;
                case 'IN':
                case 'IN(...)':
                case 'NOT IN':
                case 'NOT IN(...)':
                    $where[] = [$k, str_replace('(...)', '', $sym), is_array($v) ? $v : explode(',', $v)];
                    break;
                case 'BETWEEN':
                case 'NOT BETWEEN':
                    $arr = array_slice(explode(',', $v), 0, 2);
                    if (stripos($v, ',') === false || !array_filter($arr, function ($v) {
                        return $v != '' && $v !== false && $v !== null;
                    })) {
                        continue 2;
                    }
                    //当出现一边为空时改变操作符
                    if ($arr[0] === '') {
                        $sym = $sym == 'BETWEEN' ? '<=' : '>';
                        $arr = $arr[1];
                    } elseif ($arr[1] === '') {
                        $sym = $sym == 'BETWEEN' ? '>=' : '<';
                        $arr = $arr[0];
                    }
                    $where[] = [$k, $sym, $arr];
                    break;
                case 'RANGE':
                case 'NOT RANGE':
                    $v = str_replace(' - ', ',', $v);
                    $arr = array_slice(explode(',', $v), 0, 2);
                    if (stripos($v, ',') === false || !array_filter($arr)) {
                        continue 2;
                    }
                    //当出现一边为空时改变操作符
                    if ($arr[0] === '') {
                        $sym = $sym == 'RANGE' ? '<=' : '>';
                        $arr = $arr[1];
                    } elseif ($arr[1] === '') {
                        $sym = $sym == 'RANGE' ? '>=' : '<';
                        $arr = $arr[0];
                    }
                    $tableArr = explode('.', $k);
                    if (count($tableArr) > 1 && $tableArr[0] != $name && !in_array($tableArr[0], $alias)
                        && !empty($this->model) && $this->relationSearch) {
                        //修复关联模型下时间无法搜索的BUG
                        $relation = Loader::parseName($tableArr[0], 1, false);
                        $alias[$this->model->$relation()->getTable()] = $tableArr[0];
                    }
                    $where[] = [$k, str_replace('RANGE', 'BETWEEN', $sym) . ' TIME', $arr];
                    break;
                case 'NULL':
                case 'IS NULL':
                case 'NOT NULL':
                case 'IS NOT NULL':
                    $where[] = [$k, strtolower(str_replace('IS ', '', $sym))];
                    break;
                default:
                    break;
            }
            $index++;
        }
        if (!empty($this->model)) {
            $this->model->alias($alias);
        }
        $model = $this->model;
        $where = function ($query) use ($where, $alias, $bind, &$model) {
            if (!empty($model)) {
                $model->alias($alias);
                $model->bind($bind);
            }
            foreach ($where as $k => $v) {
                if (is_array($v)) {
                    call_user_func_array([$query, 'where'], $v);
                } else {
                    $query->where($v);
                }
            }
        };
        return [$where, $sort, $order, $offset, $limit, $page, $alias, $bind];
    }

    /**
     * 获取数据限制的管理员ID
     * 禁用数据限制时返回的是null
     * @return mixed
     */
    protected function getDataLimitAdminIds()
    {
        if (!$this->dataLimit) {
            return null;
        }
        if ($this->auth->isSuperAdmin()) {
            return null;
        }
        $adminIds = [];
        if (in_array($this->dataLimit, ['auth', 'personal'])) {
            $adminIds = $this->dataLimit == 'auth' ? $this->auth->getChildrenAdminIds(true) : [$this->auth->id];
        }
        return $adminIds;
    }

    /**
     * Selectpage的实现方法
     *
     * 当前方法只是一个比较通用的搜索匹配,请按需重载此方法来编写自己的搜索逻辑,$where按自己的需求写即可
     * 这里示例了所有的参数，所以比较复杂，实现上自己实现只需简单的几行即可
     *
     */
    protected function selectpage()
    {
        //设置过滤方法
        $this->request->filter(['trim', 'strip_tags', 'htmlspecialchars']);

        //搜索关键词,客户端输入以空格分开,这里接收为数组
        $word = (array)$this->request->request("q_word/a");
        //当前页
        $page = $this->request->request("pageNumber");
        //分页大小
        $pagesize = $this->request->request("pageSize");
        //搜索条件
        $andor = $this->request->request("andOr", "and", "strtoupper");
        //排序方式
        $orderby = (array)$this->request->request("orderBy/a");
        //显示的字段
        $field = $this->request->request("showField");
        //主键
        $primarykey = $this->request->request("keyField");
        //主键值
        $primaryvalue = $this->request->request("keyValue");
        //搜索字段
        $searchfield = (array)$this->request->request("searchField/a");
        //自定义搜索条件
        $custom = (array)$this->request->request("custom/a");
        //是否返回树形结构
        $istree = $this->request->request("isTree", 0);
        $ishtml = $this->request->request("isHtml", 0);
        if ($istree) {
            $word = [];
            $pagesize = 999999;
        }
        $order = [];
        foreach ($orderby as $k => $v) {
            $order[$v[0]] = $v[1];
        }
        $field = $field ? $field : 'name';

        //如果有primaryvalue,说明当前是初始化传值
        if ($primaryvalue !== null) {
            $where = [$primarykey => ['in', $primaryvalue]];
            $pagesize = 999999;
        } else {
            $where = function ($query) use ($word, $andor, $field, $searchfield, $custom) {
                $logic = $andor == 'AND' ? '&' : '|';
                $searchfield = is_array($searchfield) ? implode($logic, $searchfield) : $searchfield;
                $searchfield = str_replace(',', $logic, $searchfield);
                $word = array_filter(array_unique($word));
                if (count($word) == 1) {
                    $query->where($searchfield, "like", "%" . reset($word) . "%");
                } else {
                    $query->where(function ($query) use ($word, $searchfield) {
                        foreach ($word as $index => $item) {
                            $query->whereOr(function ($query) use ($item, $searchfield) {
                                $query->where($searchfield, "like", "%{$item}%");
                            });
                        }
                    });
                }
                if ($custom && is_array($custom)) {
                    foreach ($custom as $k => $v) {
                        if (is_array($v) && 2 == count($v)) {
                            $query->where($k, trim($v[0]), $v[1]);
                        } else {
                            $query->where($k, '=', $v);
                        }
                    }
                }
            };
        }
        $adminIds = $this->getDataLimitAdminIds();
        if (is_array($adminIds)) {
            $this->model->where($this->dataLimitField, 'in', $adminIds);
        }
        $list = [];
        $total = $this->model->where($where)->count();
        if ($total > 0) {
            if (is_array($adminIds)) {
                $this->model->where($this->dataLimitField, 'in', $adminIds);
            }

            $fields = is_array($this->selectpageFields) ? $this->selectpageFields : ($this->selectpageFields && $this->selectpageFields != '*' ? explode(',', $this->selectpageFields) : []);

            //如果有primaryvalue,说明当前是初始化传值,按照选择顺序排序
            if ($primaryvalue !== null && preg_match("/^[a-z0-9_\-]+$/i", $primarykey)) {
                $primaryvalue = array_unique(is_array($primaryvalue) ? $primaryvalue : explode(',', $primaryvalue));
                //修复自定义data-primary-key为字符串内容时，给排序字段添加上引号
                $primaryvalue = array_map(function ($value) {
                    return '\'' . $value . '\'';
                }, $primaryvalue);

                $primaryvalue = implode(',', $primaryvalue);

                $this->model->orderRaw("FIELD(`{$primarykey}`, {$primaryvalue})");
            } else {
                $this->model->order($order);
            }

            $datalist = $this->model->where($where)
                ->page($page, $pagesize)
                ->select();

            foreach ($datalist as $index => $item) {
                unset($item['password'], $item['salt']);
                if ($this->selectpageFields == '*') {
                    $result = [
                        $primarykey => $item[$primarykey] ?? '',
                        $field      => $item[$field] ?? '',
                    ];
                } else {
                    $result = array_intersect_key(($item instanceof Model ? $item->toArray() : (array)$item), array_flip($fields));
                }
                $result['pid'] = isset($item['pid']) ? $item['pid'] : (isset($item['parent_id']) ? $item['parent_id'] : 0);
                $result = array_map("htmlentities", $result);
                $list[] = $result;
            }
            if ($istree && !$primaryvalue) {
                $tree = Tree::instance();
                $tree->init(collection($list)->toArray(), 'pid');
                $list = $tree->getTreeList($tree->getTreeArray(0), $field);
                if (!$ishtml) {
                    foreach ($list as &$item) {
                        $item = str_replace('&nbsp;', ' ', $item);
                    }
                    unset($item);
                }
            }
        }
        //这里一定要返回有list这个字段,total是可选的,如果total<=list的数量,则会隐藏分页按钮
        return json(['list' => $list, 'total' => $total]);
    }

    /**
     * 刷新Token
     */
    protected function token()
    {
        $token = $this->request->param('__token__');

        //验证Token
        if (!Validate::make()->check(['__token__' => $token], ['__token__' => 'require|token'])) {
            $this->error(__('Token verification error'), '', ['__token__' => $this->request->token()]);
        }

        //刷新Token
        $this->request->token();
    }

    public function getSelectAreaCode($area_code){
        if (strlen($area_code) != 6){
            return $area_code;
        }
        $chunks = str_split($area_code, 2);
        $res = $chunks[0];

        if ($chunks[2] == '00'){
            if ($chunks[1] != '00'){
                $res .= $chunks[1];
            }
        }else{
            $res .= $chunks[1] . $chunks[2];
        }
        return $res;

    }

    public function buildTree($data, $parentId = 0) {
        $branch = [];

        foreach ($data as $item) {
            if ($item['pid'] == $parentId) {
                $children = $this->buildTree($data, $item['id']);
                if ($children) {
                    $item['children'] = $children;
                }
                $branch[] = $item;
            }
        }

        return $branch;
    }

    public function formatTree($tree) {
        $formattedTree = [];

        foreach ($tree as $item) {
            $formattedItem = [
                'value' => $item['id'],
                'label' =>  str_replace('&nbsp;', '', $item['title'])
            ];

            if (isset($item['children']) && count($item['children']) > 0) {
                $formattedItem['children'] = $this->formatTree($item['children']);
            }

            $formattedTree[] = $formattedItem;
        }

        return $formattedTree;
    }

    public function filterAreaCodes(array $area_codes)
    {
        // 提取所有两位区号
        $prefix_2_digits = [];
        foreach ($area_codes as $code) {
            if (strlen($code) == 2) {
                $prefix_2_digits[] = $code;
            }
        }

        // 过滤数组
        $filtered_codes = array_filter($area_codes, function ($code) use ($prefix_2_digits) {
            // 如果是两位区号，直接保留
            if (strlen($code) == 2) {
                return true;
            }
            // 检查是否有对应的两位前缀，如果有，则排除四位区号
            foreach ($prefix_2_digits as $prefix) {
                if (strpos($code, $prefix) === 0) {
                    return false;
                }
            }
            // 如果没有匹配的两位前缀，则保留
            return true;
        });

        // 重新索引数组
        return array_values($filtered_codes);
    }

    public function getItemsById(mixed $item_id)
    {
        $build = new \app\admin\model\Item();
        $data =  $build->getAllData();
        return \app\admin\model\Item::getAllChildIds($data,$item_id);
    }

    /**
     * @return array
     * @throws DbException
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\ModelNotFoundException
     */
    protected function getSource(): array
    {
        $sources = Db::name('source')
            ->where('status', 1)
            ->field(['id', 'title', 'key_word', 'pid'])
            ->order('pid', 'asc')
            ->order('sort', 'desc')
            ->select();
        $filtered = array_filter($sources, function ($item) {
            return $item['pid'] == 0;
        });

        $pid_map = array_column($filtered, null, 'id');
        $res = [];
        foreach ($sources as $item) {
            if ($item['pid'] != 0 && isset($pid_map[$item['pid']])) {
                $res [] = [
                    ...$item, 'ptitle' => $pid_map[$item['pid']]['title']
                ];
            }
        }
        return $res;
    }

    protected function exportExcelByStream(array $columns, callable $fetchData, string $filename = '导出.xlsx', int $limit = 1000)
    {
        $page = 1;
        $rowIndex = 2;
        if (ob_get_level()) ob_end_clean();
        ob_clean();

        ini_set('memory_limit', '512M');
        set_time_limit(0);
        ignore_user_abort(true);
        ini_set('zlib.output_compression', 'Off');

        // 创建 Spreadsheet 和 Sheet
        $spreadsheet = new Spreadsheet();
        $spreadsheet->removeSheetByIndex(0);
        $sheet = new Worksheet($spreadsheet, 'Sheet1');
        $spreadsheet->addSheet($sheet);
        $spreadsheet->setActiveSheetIndex(0);
        $sheet = $spreadsheet->getActiveSheet();

        $writer = new Xlsx($spreadsheet);
        $writer->setPreCalculateFormulas(false);

        // 获取字段映射
        $titles = array_column($columns, 'title');
        $fields = array_column($columns, 'field');

        // 写入表头
        $sheet->fromArray($titles, null, 'A1');

        // 分页写入数据
        do {
            $rows = $fetchData($page, $limit);
            $count = count($rows);
            if ($count === 0) break;

            foreach ($rows as $row) {
                $dataRow = [];
                foreach ($fields as $field) {
                    $value = $this->getNestedValue($row->toArray(), $field);
                    if (is_array($value) || is_object($value)) {
                        $value = json_encode($value, JSON_UNESCAPED_UNICODE);
                    }
                    $dataRow[] = $value;
                }
                $sheet->fromArray($dataRow, null, 'A' . $rowIndex);
                $rowIndex++;
            }

            $page++;
        } while ($count === $limit);

        // 输出为下载流
        $filename = $filename ?: ('导出_' . date('Ymd_His') . '.xlsx');
        header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
        header('Content-Disposition: attachment;filename="' . $filename . '"');
        header('Cache-Control: max-age=0');
        header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
        header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
        header('Pragma: public');

        $writer->save('php://output');
        $spreadsheet->disconnectWorksheets();
        unset($spreadsheet);
        exit;
    }
    protected function getNestedValue(array $data, string $path, $default = '')
    {
        $segments = explode('.', $path);
        foreach ($segments as $segment) {
            if (is_array($data) && array_key_exists($segment, $data)) {
                $data = $data[$segment];
            } elseif (is_object($data) && isset($data->{$segment})) {
                $data = $data->{$segment};
            } else {
                return $default;
            }
        }
        return $data;
    }
}