<?php

namespace app\admin\controller;

use think\Controller;
use think\Db;
use app\bj\controller\Common;
use think\Log;
use \think\Validate;
use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
use PhpOffice\PhpSpreadsheet\Style\Border;
use PhpOffice\PhpSpreadsheet\Style\Fill;
use PhpOffice\PhpSpreadsheet\Style\Alignment;

class Download extends Controller{
    
    protected $ceshiyong_token = 'caadd1be045a65f30b92aa805f1de54a';

    // // 测试后端判断是否微信环境
    // function is_wechat() {
    //     // 获取 User-Agent 字符串
    //     $userAgent = $_SERVER['HTTP_USER_AGENT'];
        
    //     // 检查 User-Agent 字符串中是否包含 "MicroMessenger"
    //     if (strpos($userAgent, 'MicroMessenger') !== false) {
    //         echo "是微信浏览器";
    //     }else{
    //         echo "不是微信浏览器";
    //     }
    // }

    /**
     * 下载 Excel 文件
     *
     * @param array $data 要导出的数据
     * @param string $filename 文件名
     * @return void
     */
    public function downloadExcel($ceshiyong_data, $filename = 'data.xlsx')
    {
        // 创建一个新的 Spreadsheet 对象
        $spreadsheet = new Spreadsheet();
        $sheet = $spreadsheet->getActiveSheet();

        // 获取列数
        $columnCount = count($ceshiyong_data[0]);

        // 添加标题到工作表中
        $titles = $ceshiyong_data[0];
        for ($colIndex = 0; $colIndex < $columnCount; $colIndex++) {
            $sheet->setCellValueByColumnAndRow($colIndex + 1, 1, $titles[$colIndex]);
        }

        // 添加数据到工作表中
        $data = array_slice($ceshiyong_data, 1);
        foreach ($data as $rowIndex => $rowData) {
            for ($colIndex = 0; $colIndex < $columnCount; $colIndex++) {
                $sheet->setCellValueByColumnAndRow($colIndex + 1, $rowIndex + 2, $rowData[$colIndex]);
            }
        }

        // 设置表头样式
        $headerStyle = [
            'font' => [
                'bold' => true,
            ],
            'fill' => [
                'fillType' => Fill::FILL_SOLID,
                'startColor' => [
                    'argb' => 'FFFFC000', // 橙色
                ],
            ],
            'alignment' => [
                'horizontal' => Alignment::HORIZONTAL_CENTER,
            ],
            'borders' => [
                'allBorders' => [
                    'borderStyle' => Border::BORDER_THIN,
                ],
            ],
        ];
        $sheet->getStyle('A1:' . $this->getExcelColumnName($columnCount) . '1')->applyFromArray($headerStyle);

        // 设置所有内容居中
        $allContentStyle = [
            'alignment' => [
                'horizontal' => Alignment::HORIZONTAL_CENTER,
            ],
            'borders' => [
                'allBorders' => [
                    'borderStyle' => Border::BORDER_THIN,
                ],
            ],
        ];
        $sheet->getStyle('A1:' . $this->getExcelColumnName($columnCount) . (count($ceshiyong_data) + 1))->applyFromArray($allContentStyle);

        // 设置斑马纹效果
        $rowCount = count($ceshiyong_data) - 1; // 数据行数
        for ($rowIndex = 1; $rowIndex <= $rowCount; $rowIndex++) {
            $row = $rowIndex + 1; // 数据行从第二行开始
            $rowStyle = [
                'fill' => [
                    'fillType' => Fill::FILL_SOLID,
                    'startColor' => [
                        'argb' => ($rowIndex % 2 == 0) ? 'FFDDDDDD' : 'FFFFFFFF', // 偶数行浅灰色，奇数行白色
                    ],
                ],
            ];
            $sheet->getStyle('A' . $row . ':' . $this->getExcelColumnName($columnCount) . $row)->applyFromArray($rowStyle);
        }

        // 设置响应头以触发文件下载
        header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
        header('Content-Disposition: attachment;filename="' . $filename . '"');
        header('Cache-Control: max-age=0');

        // 保存并输出 Excel 文件
        $writer = new Xlsx($spreadsheet);
        $writer->save('php://output');

        exit;
    }

    /**
     * 获取 Excel 列名
     *
     * @param int $index 列索引（从1开始）
     * @return string Excel 列名
     */
    private function getExcelColumnName($index)
    {
        $columnName = '';
        while ($index > 0) {
            $remainder = ($index - 1) % 26;
            $columnName = chr(65 + $remainder) . $columnName;
            $index = intval(($index - 1) / 26);
        }
        return $columnName;
    }
}