<?php
// 这是系统自动生成的公共文件

if (!function_exists('array_to_tree')) {
    /**
     * 数组转换为树状结构
     * @param array $data 数据
     * @param int $pid 父级ID
     * @param string $with 转换依据字段
     * @param int $level 层级
     * @return array
     */
    function array_to_tree(array $data, int $pid, string $with = 'pid', int $level = 1)
    {
        $ret = [];
        foreach ($data as $item) {
            if ($item[$with] == $pid) {
                $item['level'] = $level;
                $children = array_to_tree($data, $item['id'], $with, $level + 1);
                if ($children) {
                    $item['children'] = $children;
                }
                $ret[] = $item;
            }
        }
        return $ret;
    }
}

if (!function_exists('xlsx_writer')) {
    /**
     * 构建Excel数据
     * @param array $data 数据 例：[['name'=>'张三','age'=>18, 'sex'=>'男']]
     * @param array $schema 表头信息 例：['name' => '姓名', 'age' => '年龄', 'sex' => '性别']
     * @param string $filename 下载文件名称 默认为YmdHis时间
     * @return \PhpOffice\PhpSpreadsheet\Writer\IWriter
     */
    function xlsx_writer(array|\think\model\Collection $data, array $schema, string $filename = ''): \PhpOffice\PhpSpreadsheet\Writer\IWriter
    {
        // 获取Spreadsheet对象
        $spreadsheet = new \PhpOffice\PhpSpreadsheet\Spreadsheet();
        $sheet = $spreadsheet->getActiveSheet();

        // 写入表头
        $title = array_values($schema);
        $title_col = 'A';
        foreach ($title as $value) {
            // 单元格内容写入
            $sheet->setCellValue($title_col . '1', $value);
            $title_col++;
        }

        // 写入数据
        $row = 2;
        $keys = array_keys($schema);
        foreach ($data as $item) {
            $data_col = 'A';
            foreach ($keys as $key) {
                $sheet->setCellValue($data_col . $row, $item[$key] ?? '');
                $data_col++;
            }
            $row++;
        }

        flush();
        ob_flush();
        if ($filename == '') $filename = date('YmdHis');
        header('Access-Control-Expose-Headers: Content-Disposition');
        header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet; Charset=UTF-8');
        header('Content-Disposition: attachment;filename=' . $filename . '.xlsx');
        header('Cache-Control: max-age=0');
        return \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Xlsx');
    }
}