<?php

namespace App\Service;

use Illuminate\Support\Facades\Config;
use Illuminate\Support\Facades\DB;

class U8DatabaseServerService
{
    public $db = null;
    public $error = null; // 错误信息存储
    private $database = "";
    private $connName = "";

    public function __construct($loginUser = [])
    {
        $this->database = $loginUser['zt_database'] ?? "";

        if (empty($this->database)) {
            $this->error = "账套数据库名称不能为空";
            return;
        }

        $this->connName = 'sqlsrv_dynamic_' . md5($this->database);

        $this->createConnection();
    }

    /**
     * 创建 SQL Server 连接
     */
    private function createConnection()
    {
        $mainConnName = $this->connName;

        $mainConfig = [
            'driver'   => 'sqlsrv',
            'host'     => env('SQLSRV_HOST'),
            'port'     => env('SQLSRV_PORT'),
            'database' => $this->database,
            'username' => env('SQLSRV_USERNAME'),
            'password' => env('SQLSRV_PASSWORD'),
            'options'  => [
                \PDO::SQLSRV_ATTR_QUERY_TIMEOUT => 15, // 查询超时
                \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
            ],
            'charset'  => 'utf8',
            'prefix'   => '',
        ];

        try {
            // 1. 动态注入配置
            Config::set("database.connections.{$mainConnName}", $mainConfig);

            // 2. 获取连接句柄
            $this->db = DB::connection($mainConnName);

            // 3. 验证连接（执行一次 SELECT 1）
            // 注意：SQLServer 有时候会因为防火墙或网络伪连，这里必须 try 才能抓到错误
            $this->db->getPdo();

        } catch (\Throwable $e) {
            $this->error = "SQLServer连接验证失败: " . $e->getMessage();
            // 如果连接失败，清理掉无效配置
            $this->close();
        }
    }

    /**
     * 手动关闭并清理连接 (非常关键)
     * 特别是在 Command 脚本中，不调用这个会导致数据库句柄残留
     */
    public function close()
    {
        try {
            if ($this->connName) {
                // 1. 断开物理连接
                DB::disconnect($this->connName);

                // 2. 从 Laravel 的连接池中彻底清除
                DB::purge($this->connName);

                // 3. 移除动态注入的 Config
                Config::offsetUnset("database.connections.{$this->connName}");
            }
        } catch (\Throwable $e) {
            // 忽略清理时的异常
        } finally {
            $this->db = null;
        }
    }
}