<?php

namespace wchat;

class Http
{
    private $url = 'https://api.weixin.qq.com';

    private $header = [];

    /**
     * @param        $url
     * @param string $pushType
     * @param array $data
     *
     * @return Result
     */
    private function request($url, $pushType = 'get', $data = [], callable $callback = NULL)
    {

        if (
            strpos($url, 'http://') === FALSE &&
            strpos($url, 'https://') === FALSE
        ) {
            $url = $this->url . '/' . $url;
        }

        return $this->curl_push($url, $pushType, $data, $callback);
    }

    /**
     * @param        $url
     * @param string $type
     * @param array $data
     *
     * @return Result
     * curl请求
     */
    public function curl_push($url, $type = 'get', $data = [], callable $callback = NULL)
    {
        $_data = $this->paramEncode($data);
        if ($type == 'get' && is_array($_data)) {
            $url .= '?' . http_build_query($_data);
        }

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_TIMEOUT, 5);// 超时设置
        curl_setopt($ch, CURLOPT_HEADER, TRUE);
        if (!empty($this->header)) {
            curl_setopt($ch, CURLOPT_HTTPHEADER, $this->header);
        }
        curl_setopt($ch, CURLOPT_NOBODY, FALSE);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 1);// 超时设置
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);//返回内容
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);// 跟踪重定向
        curl_setopt($ch, CURLOPT_ENCODING, 'gzip,deflate');
        switch (strtolower($type)) {
            case 'post':
                curl_setopt($ch, CURLOPT_POST, 1);
                if (is_array($_data)) {
                    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($_data));
                } else {
                    curl_setopt($ch, CURLOPT_POSTFIELDS, $_data);
                }
                break;
            case 'delete':
                curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'DELETE');
                curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($_data));
                break;
            case 'put':
                curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
                curl_setopt($ch, CURLOPT_POSTFIELDS, $_data);
                break;
            default:
                curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
        }
        $output = curl_exec($ch);
        if ($output === FALSE) {
            return new Result(['code' => 500, 'message' => curl_error($ch)]);
        }
        curl_close($ch);

        list($header, $body) = explode("\r\n\r\n", $output, 2);
        $result = [];
        if ($callback === NULL) {
            if (is_null($results = json_decode($body, TRUE))) {
                return new Result(['code' => 500, 'message' => '服务器连接失败']);
            }
            if (isset($results['errcode'])) {
                $result['code'] = $results['errcode'];
                $result['message'] = $results['errmsg'];
            } else {
                $result['code'] = 0;
                $result['message'] = 'system success.';
                $result['data'] = $results;
            }
        } else {
            $result = call_user_func($callback, $body, $_data);
        }

        if (!is_array($result)) {
            return $result;
        }

        return new Result($result);
    }

    /**
     * @param        $arr
     * @param string $pushType
     *
     * @return array|string
     * 将请求参数进行编码
     */
    private function paramEncode($arr, $pushType = 'post')
    {
        if (!is_array($arr)) {
            return $arr;
        }
        $_tmp = [];
        foreach ($arr as $Key => $val) {
            $_tmp[$Key] = $val;
        }

        return ($pushType == 'post' ? $_tmp : http_build_query($_tmp));
    }

    /**
     * @param       $url
     * @param array $data
     * @param array $header
     *
     * @return Result
     */
    public static function post($url, $data = [], callable $callback = NULL, array $header = NULL)
    {
        static $_class = NULL;
        if ($_class == NULL) $_class = new Http();
        if (!empty($header)) {
            $_class->setHeaders($header);
        }
        return $_class->request($url, 'post', $data, $callback);
    }

    /**
     * @param       $url
     * @param array $data
     * @param array $header
     *
     * @return Result
     */
    public static function get($url, $data = [], callable $callback = NULL, $header = [])
    {
        static $_class = NULL;
        if ($_class == NULL) $_class = new Http();
        return $_class->request($url, 'get', $data, $callback);
    }

    /**
     * @param       $url
     * @param array $data
     * @param array $header
     *
     * @return Result
     */
    public static function option($url, $data = [], $header = [])
    {
        static $_class = NULL;
        if ($_class == NULL) $_class = new Http();
        return $_class->request($url, 'option', $data);
    }

    /**
     * @param       $url
     * @param array $data
     * @param array $header
     *
     * @return Result
     */
    public static function delete($url, $data = [], $header = [])
    {
        static $_class = NULL;
        if ($_class == NULL) $_class = new Http();
        return $_class->request($url, 'delete', $data);
    }


    public function setHeaders(array $headers)
    {
        if (empty($headers)) {
            return [];
        }
        foreach ($headers as $key => $val) {
            $this->header[] = $key . ':' . $val;
        }
        return $this->header;
    }
}