<?php
declare (strict_types = 1);

namespace app\service\user;


use app\model\WechatUser;
use app\service\BaseService;
use fast\Http;
use think\facade\Cookie;
use think\facade\Session;

class LoginService extends  BaseService
{

    /**
     * 判断登录状态
     * @return bool
     */
    public function isLogin()
    {
        if (!$this->user) {
            return false;
        }
        return true;
    }

    /**
     * 登录凭证校验
     * @param $code
     * @param $iv
     * @param $encryptedData
     * @return array
     * @throws \fast\FuncException
     */
    public function code2session($code, $iv, $encryptedData)
    {

        $http = new Http();
        $url  = "https://api.weixin.qq.com/sns/jscode2session?appid=" . env("app.appid") . "&secret=" . env("app.appsecret") . "&js_code={$code}&grant_type=authorization_code";
        $res  = $http::get($url);
        if ($res['code'] != 200) {
            throw new \fast\FuncException($res['msg']);
        }
        $res['data'] = json_decode($res['data'], true);
        if (isset($res['data']['errcode'])) {
            throw new \fast\FuncException($res['data']['errmsg']);
        }
        session('app_openid', $res['data']['openid']);
        session('app_session_key', $res['data']['session_key']);
        $res['userInfo'] = json_decode($this->decodeWechatIv($iv, $encryptedData), true);

        $result           = [];
        $result['openid'] = $res['data']['openid'];
        if (isset($res['data']['unionid'])) $result['unionid'] = $res['data']['unionid'];
        $result['phone'] = $res['userInfo']['phoneNumber'];

        return $result;
    }

    /**
     * 解密微信的iv和encryptedData
     * @param $iv
     * @param $encryptedData
     * @return false|string
     * @throws \fast\FuncException
     */
    public function decodeWechatIv($iv, $encryptedData)
    {
        $openid      = session('app_openid');
        $session_key = session('app_session_key');
        if (!$openid || !$session_key) {
            throw new \fast\FuncException('缺少主要参数');
        }
        if (strlen($session_key) != 24) {
            throw new \fast\FuncException('sessionkey长度错误');
        }
        if (strlen($iv) != 24) {
            throw new \fast\FuncException('iv长度错误');
        }
        $aesKey    = base64_decode($session_key);
        $aesIV     = base64_decode($iv);
        $aesCipher = base64_decode($encryptedData);
        $result    = openssl_decrypt($aesCipher, "AES-128-CBC", $aesKey, 1, $aesIV);
        $dataObj   = json_decode($result);
        if ($dataObj == NULL) {
            throw new \fast\FuncException('登录失败，请稍候再试');
        }
        if ($dataObj->watermark->appid != env("app.appid")) {
            throw new \fast\FuncException('小程序appid不一致，登录失败');
        }
        return $result;


    }

    /**
     * 用户端登录
     * @param $phone
     * @param $openid
     * @param $unionid
     * @return WechatUser|mixed
     * @throws \fast\FuncException
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\DbException
     * @throws \think\db\exception\ModelNotFoundException
     */
    public function userLogin($phone, $openid, $unionid)
    {
        $field = 'id,openid,phone,nickname,sex,headimgurl';
        $user  = WechatUser::where('phone', $phone)->where('delete_time', 0)->field($field)->find();
        if ($openid != $user->openid) {
            WechatUser::where('id', $user->id)->save(['openid' => $user->openid]);
        }
        if ($user) {
            return $this->userSuccess($user);
        }
        return $this->register($phone, $openid, $unionid);

    }

    /**
     *
     * @param $phone
     * @return WechatUser|array|mixed
     * @throws \fast\FuncException
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\DbException
     * @throws \think\db\exception\ModelNotFoundException
     */
    public function userPhoneLogin($phone)
    {
        $field = 'id,openid,phone,nickname,sex,headimgurl';
        $user  = WechatUser::where('phone', $phone)->where('delete_time', 0)->field($field)->find();
        if ($user) {
            return $this->userSuccess($user);
        }
        return $this->register($phone);
    }

    /**
     * 用户登录成功
     * @param WechatUser $user
     * @return array
     */
    public function userSuccess(WechatUser $user)
    {
        session('user', $user->toArray());
        $this->userKeeplogin($user->id,$user->openid,3600 * 24 * 7);
//        $user->visible(['id', 'name', 'logo']);
        return $user->toArray();
    }

    /**
     * 保持登录
     * @param $user_id
     * @param $token
     * @param $keeptime
     * @return bool
     */
    protected function userKeeplogin($user_id, $token, $keeptime = 0)
    {
        if ($keeptime) {
            $expiretime = time() + $keeptime;

            $key = md5(md5(strval($user_id)) . md5(strval($keeptime)) . md5(strval($expiretime)) . $token);
            error_reporting(E_ALL);
            ini_set('display_errors', '1');
            $data = [$user_id, $keeptime, $expiretime, $key];

            Cookie::set('userKeeplogin', implode('|', $data), 86400 * 30);
            return true;
        }
        return false;
    }

    /**
     * 用户端注册
     * @param $phone
     * @param string $openid
     * @param string $unionid
     * @return WechatUser|mixed
     * @throws \fast\FuncException
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\DbException
     * @throws \think\db\exception\ModelNotFoundException
     */
    public function register($phone, string $openid = '', string $unionid = '')
    {

        $add = [
            'phone'    => $phone,
            'openid'   => $openid,
            'nickname' => '微信用户',
            'unionid'  => $unionid ?? '',
        ];
        $id  = (new WechatUser())->insertGetId($add);

        if (!$id) {
            throw new \fast\FuncException('注册失败，请稍候再试');
        }
        $user = WechatUser::where('id', $id)->find();
        return $this->userSuccess($user);

    }

    /**
     * 自动登录
     * @return WechatUser|array|false|mixed|\think\Model
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\DbException
     * @throws \think\db\exception\ModelNotFoundException
     */
    public function userAutologin() {
        $keeplogin = Cookie::get('userKeeplogin');
        if (!$keeplogin) {
            return false;
        }
        [$id, $keeptime, $expiretime, $key] = explode('|', $keeplogin);
        if ($id && $keeptime && $expiretime && $key && $expiretime > time()) {
            $user = WechatUser::where('id', $id)->find();
            if (!$user || !$user->token) {
                return false;
            }
            unset($user->password);
            //token有变更
            if ($key != md5(md5($id) . md5($keeptime) . md5($expiretime) . $user->token)) {
                return false;
            }
            Session::set('user', $user->toArray());
            //刷新自动登录的时效
            $this->userKeeplogin($id,$user->token,$keeptime);
            return $user;
        } else {
            return false;
        }
    }

    /**
     * 登出
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\DbException
     * @throws \think\db\exception\ModelNotFoundException
     */
    public function userLogout() {
        $user = WechatUser::find($this->user_id);
        if ($user) {
            $user->token = '';
            $user->save();
        }
        Session::delete('user');
        Cookie::delete('userKeeplogin');
        return true;
    }
}