<?php

namespace App\Service;

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

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

    public function __construct($loginUser = [])
    {
        $this->database = $loginUser['zt_database'] ?? "";
        $this->connName = 'sqlsrv_' . $this->database . '_' . uniqid();
        $this->createConnection();
    }

    private function createConnection()
    {
        $mainConnName = $this->connName;

        // 创建连接
        $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,  // 减少超时
                \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
            ],
        ];

        // 配置注入
        Config::set("database.connections.{$mainConnName}", $mainConfig);

        // 连接
        $this->db = DB::connection($mainConnName);

        // 测试
        $this->validateConnection($this->db);

        // 如果失败，立即清理，避免残留连接名
        if ($this->error) {
            $this->safeDisconnect($this->db, $mainConnName);
        }
    }

    private function validateConnection($connection)
    {
        try {
            $pdo  = $connection->getPdo();
            $stmt = $pdo->prepare("SELECT 1 AS connection_test");
            $stmt->execute();
        } catch (\Throwable $e) {
            $this->error = "数据库连接验证失败: " . $e->getMessage();
        }
    }

    /**
     * 手动关闭连接（定时任务必须调用）
     */
    public function close()
    {
        $this->safeDisconnect($this->db, $this->connName);
    }

    private function safeDisconnect(&$connection, $name)
    {
        try {
            if ($connection instanceof \Illuminate\Database\Connection) {

                // 断开物理连接
                $connection->disconnect();

                // 清除 Laravel 连接池
                DB::purge($name);

                // 移除配置
                Config::offsetUnset("database.connections.{$name}");

                // 引用置空
                $connection = null;
            }
        } catch (\Throwable $e) {
            // 忽略
        }
    }

    /**
     * 阻止依赖 __destruct
     */
    public function __destruct()
    {
        // 不做任何事，避免不确定行为
    }
}