<?php

/**
 * 文件功能：后台 SQL 探针
 * (替代原版 SQL.ASP，严格限制为只读模式)
 *
 * @author   ChatRoom Laravel
 *
 * @version  1.0.0
 */

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\View\View;

class SqlController extends Controller
{
    /**
     * 显示 SQL 执行沙盒界面
     */
    public function index(): View
    {
        return view('admin.sql.index', ['results' => null, 'query' => '', 'columns' => []]);
    }

    /**
     * 极度受限地执行 SQL (仅限 SELECT)
     */
    public function execute(Request $request): View
    {
        $request->validate([
            'query' => 'required|string|min:6',
        ]);

        $sql = trim($request->input('query'));

        // 安全拦截：绝不允许含有 update/delete/insert/truncate/drop 等破坏性指令
        // 我们只允许查询，所以要求必须以 SELECT 起手，或者 EXPLAIN/SHOW
        if (! preg_match('/^(SELECT|EXPLAIN|SHOW|DESCRIBE)\s/i', $sql)) {
            return view('admin.sql.index', [
                'results' => null,
                'columns' => [],
                'query' => $sql,
                'error' => '安全保护触发：本探针只允许执行 SELECT / SHOW 等只读查询！',
            ]);
        }

        try {
            $results = DB::select($sql);

            // 提取表头
            $columns = [];
            if (! empty($results)) {
                $firstRow = (array) $results[0];
                $columns = array_keys($firstRow);
            }

            return view('admin.sql.index', [
                'results' => $results,
                'columns' => $columns,
                'query' => $sql,
                'error' => null,
            ]);
        } catch (\Exception $e) {
            return view('admin.sql.index', [
                'results' => null,
                'columns' => [],
                'query' => $sql,
                'error' => 'SQL 执行发生异常: '.$e->getMessage(),
            ]);
        }
    }
}