<?php

if (!defined('ABSPATH')) {
    exit; // Exit if accessed directly
}

class HuayiScoreSdk
{
    //接口地址
    protected $apiurl = null;
    //接口Token
    protected $token = null;
    // 错误信息
    protected $error = null;

    //查询积分接口
    protected $get_balance_url = '/api/scoreshopv1/balance/index';
    //支出积分接口
    protected $pay_url = '/api/scoreshopv1/pay/index';
    //退回积分接口
    protected $refund_url = '/api/scoreshopv1/refund/index';

    public function __construct($option)
    {
        $this->apiurl = isset($option['apiurl']) ? $option['apiurl'] : '';
        $this->token = isset($option['token']) ? $option['token'] : '';
    }

    /**
     * PASS
     * 获取积分余额
     * @param $huayi_uid
     * @return bool
     */
    public function getBalance($huayi_uid)
    {
        $url = $this->apiurl.$this->get_balance_url;

        $data = [
            'uid'=>$huayi_uid,
            'timestamp'=>time()
            ];
        $response = $this->postRequest($url, $data);
        if (!$response) {//请求失败
            return false;
        } elseif ($response['body']['code'] == 1) {//请求成功
            return $response['body'];
        } else {//请求成功但是返回错误
            $this->error = $response['body']['msg'];
            return false;
        }
    }

    /**
     * TODO TEST
     * 支出积分
     * @param $huayi_uid
     * @param $amount
     * @param $note
     * @return bool
     */
    public function pay($huayi_uid, $amount, $note)
    {
        $url = $this->apiurl.$this->pay_url;

        $data = [
            'uid'=>$huayi_uid,
            'amount'=>$amount,
            'note'=>$note,
            'timestamp'=>time()
        ];
        $response = $this->postRequest($url, $data);
        if (!$response) {//请求失败
            return false;
        } elseif ($response['body']['code'] == 1) {//请求成功
            return $response['body'];
        } else {//请求成功但是返回错误
            $this->error = $response['body']['msg'];
            return false;
        }
    }

    /**
     * TODO TEST
     * 退还积分
     * @param $huayi_uid
     * @param $amount
     * @param $note
     * @return bool
     */
    public function refund($huayi_uid, $amount, $note)
    {
        $url = $this->apiurl.$this->refund_url;

        $data = [
            'uid'=>$huayi_uid,
            'amount'=>$amount,
            'note'=>$note,
            'timestamp'=>time()
        ];
        $response = $this->postRequest($url, $data);
        if (!$response) {//请求失败
            return false;
        } elseif ($response['body']['code'] == 1) {//请求成功
            return $response['body'];
        } else {//请求成功但是返回错误
            $this->error = $response['body']['msg'];
            return false;
        }
    }

    /**
     * 生成签名
     * @param $token
     * @param $data
     * @return string
     */
    protected function getSignature($token, $data)
    {
        ksort($data);// 对数组的值按key排序
        $params = http_build_query($data);// 生成url的形式
        return md5($params . $token);// 生成signature
    }

    /**
     * 签名验证
     * @param $token
     * @param $data array('uid'=>123,'timestamp'=>time(),'signature'='signature')
     * @return bool
     */
    protected function verifySignature($token, $data)
    {
        if (empty($data['signature'])) {// 验证参数中是否有签名
            $this->error = '数据签名不存在';
            return false;
        }
        if (empty($data['timestamp'])) {
            $this->error = '发送的数据参数不合法';
            return false;
        }
        if (time() - $data['timestamp'] > 600) {// 验证10分钟失效
            $this->error = '验证失效， 请重新发送请求';
            return false;
        }

        $tmpSignature = $data['signature'];//接收过来的签名

        unset($data['signature']);
        ksort($data);//对数组的值按key排序
        $params = http_build_query($data);//生成url的形式

        $signature = md5($params . $token);//计算签名
        if ($signature == $tmpSignature) {//验证签名
            $this->error = '验证通过';
            return true;
        } else {
            $this->error = '签名无效';
            return false;
        }
    }

    /**
     * 获取错误信息
     * @return mixed
     */
    public function getError()
    {
        return $this->error;
    }

    /**
     * 封装Post请求
     * @param $url
     * @param $data
     * @return bool / array
     */
    protected function postRequest($url, $data)
    {
        //生成签名
        $data['signature'] = $this->getSignature($this->token, $data);
        //请求接口
        $response = wp_remote_post($url, array(
                'method' => 'POST',
                'body' => array_merge($data),
            )
        );

        if ( is_wp_error($response) ) {
            $this->error = $response->get_error_message();
            return false;
        } else {
            $response['body'] = json_decode($response['body'], true);
            return $response;
        }
    }
}