<?php
/**
 *
 */
include_once(SERVER_ROOT . "/model/mBase.php");


class mUser extends mBase {
    private $obj;
    private $tbl;

    public function __construct() {
        $this->obj = new dUser();
        $this->tbl = 'tcm_user';
    }

    public function getUserInfo($code) {
        $openid = $this->getOpenid($code);
        if (!$openid) {
            $this->setError('获取openid失败');
            return false;
        }

        $user = $this->getUserByOpenid($openid);
        if ($user) return $user;

        //获取唯一uid串
        $identifier = $this->createUniqueID($openid);
        $user = $this->getUserByIdentifier($identifier);
        if ($user) {
            $this->setError('uid生成失败');
            return false;
        }

        $uid = $this->createUser(array('identifier' => $identifier, 'openid' => $openid));
        if (!$uid) {
            $this->setError('用户创建失败');
            return false;
        }

        return $this->getUserByUid($uid);
    }

    public function getOpenid($code) {
        $appid = MP_APPID;
        $secret = MP_SECRET;

        $get_openid_url = sprintf(MP_GET_OPENID_HREF, $appid, $secret, $code);

        $jsonres = $this->getCUrl($get_openid_url);
        $get_openid_res = json_decode($jsonres, true);
        if (empty($get_openid_res['openid'])) {
            $this->setError('获取openid失败');
            $tool_obj = new qTool();
            $tool_obj->trackLog('tcm', $get_openid_url . "|" . $jsonres, sprintf(LOG_TRACK_SAVE_PATH, date('Y-m-d'), 'tcm_get_openid'));
            return false;
        }

        return $get_openid_res['openid'];
    }

    public function getUserByOpenid($openid) {
        return $this->obj->select($this->tbl, array('sql' => '`openid`=?', 'vals' => array($openid)));
    }

    function createUniqueID($openid) {
        $uuid = uniqid($openid, true);
        $hash = hash('sha256', $uuid);
        $decimal = base_convert(substr($hash, 0, 16), 16, 10);
        return substr($decimal, 0, 10);
    }

    public function getUserByIdentifier($identifier) {
        return $this->obj->select($this->tbl, array('sql' => '`identifier`=?', 'vals' => array($identifier)));
    }

    public function getUserByUid($uid) {
        return $this->obj->select($this->tbl, array('sql' => '`uid`=?', 'vals' => array($uid)));
    }

    public function createUser($info) {
        return $this->obj->insert($this->tbl, $info);
    }

    public function getToken($uid) {
        $secretKey = JWT_KEY;
        $timestamp = time();
        $data = $uid . '|' . $timestamp;
        $token = hash_hmac('sha256', $data, $secretKey);
        return base64_encode($data . '|' . $token);
    }

    public function validateToken($uid, $token) {
        $secretKey = JWT_KEY;
        $decodedToken = base64_decode($token);
        list($valid_uid, $timestamp, $tokenHash) = explode('|', $decodedToken);

        $data = $uid . '|' . $timestamp;
        $validToken = hash_hmac('sha256', $data, $secretKey);

        if (hash_equals($validToken, $tokenHash)) {
            if (time() - $timestamp < 7200) {
                return true;
            }
        }
        return false;
    }
}