<?php

namespace App\Service;

use App\Models\UserModel;
use App\Service\common\JWTService;
use App\Service\common\UtilsService;
use Illuminate\Support\Str;

class LoginService
{

    /**
     * @var mixed 单例实例，确保该类只有一个全局实例
     */
    private static mixed $_instance;

    /**
     * 获取实例
     * @return null|static
     */
    public static function getInstance(): null|static
    {
        $name = get_called_class();
        if (!isset(self::$_instance[$name])) {
            self::$_instance[$name] = new static();
        }

        return self::$_instance[$name];
    }

    public function login($account, $password)
    {
        $userModel = UserModel::where('account', $account)->first();
        if (empty($userModel)) {
            return $this->register($account, $password);
        }

        if (!password_verify($password, $userModel->password))  {
            UtilsService::getInstance()->errorThrow('用户或密码错误！');
        }

        if ($userModel->ip !== get_ip()) {
            $ipTable = json_decode($userModel->ip_table, true);
            if (!in_array(get_ip(), $ipTable)) {
                $ipTable[] = get_ip();
            }
            $update = UserModel::where('id', $userModel->id)->update([
                'ip' => get_ip(),
                'ip_table' => json_encode($ipTable),
                'updated_at' => get_time()
            ]);

            if (!$update) {
                UtilsService::getInstance()->errorThrow('更新失败！');
            }

            $userModel = UserModel::where('id', $userModel->id)->first();
        }
        $result = [
            'id' => $userModel->id,
            'account' => $userModel->account,
            'nick_name' => $userModel->nick_name,
            'avatar' => $userModel->avatar,
            'ip' => $userModel->ip,
            'ip_table' => $userModel->ip_table,
        ];
        $token = JWTService::getInstance()->generateToken($result);
        $result['token'] = $token;
        return $result;
    }

    public function register($account, $password)
    {
        $userModel = UserModel::where('account', $account)->first();
        if ($userModel) {
            UtilsService::getInstance()->errorThrow('账号已被占用！');
        }

        $createModel = UserModel::create([
            'account' => $account,
            'password' => password_hash($password, PASSWORD_DEFAULT),
            'nick_name' => '新用户'. Str::random(),
            'avatar' => 'https://pic.rmb.bdstatic.com/bjh/80852bfe7c321988191838517ba64e309354.jpeg@h_1280',
            'ip' => get_ip(),
            'ip_table' => json_encode([get_ip()]),
            'created_at' => get_time()
        ]);

        if (!$createModel) {
            UtilsService::getInstance()->errorThrow('注册失败！');
        }

        $result = [
            'id' => $createModel->id,
            'account' => $createModel->account,
            'nick_name' => $createModel->nick_name,
            'avatar' => $createModel->avatar,
            'ip' => $createModel->ip,
            'ip_table' => $createModel->ip_table,
        ];
        $token = JWTService::getInstance()->generateToken($result);
        $result['token'] = $token;

        return $result;
    }
}