<?php
/* vi:set sw=4 ts=4 expandtab: */

/**
 * Copyright (C) 2008-2016 NURIGO \n
 * http://www.coolsms.co.kr
 */

/**
 * @mainpage PHP SDK
 * @section intro 소개
 *     - 소개 : Coolsms REST API 
 *     - 버전 : 2.0
 *     - 설명 : Coolsms REST API 를 이용 보다 빠르고 안전하게 문자메시지를 보낼 수 있는 PHP로 만들어진 SDK 입니다.
 * @section CreateInfo 작성 정보
 *     - 작성자 : Nurigo
 *     - 작성일 : 2016/05/13 
 * @section Caution 주의할 사항
 *     - PHP SDK 2.0 은 PSR4에 근거하여 만들어 졌습니다. autoloading 과 namingspace의 개념을 알고 사용 하시는게 더 좋습니다.
 * @section common 기타 정보
 *     - 저작권 GPL v2
 */

namespace Nurigo;

use Nurigo\Exceptions\CoolsmsServerException;
use Nurigo\Exceptions\CoolsmsSystemException;
use Nurigo\Exceptions\CoolsmsSDKException;

require_once __DIR__ . "/../../bootstrap.php";

// check php extension "curl_init, json_decode"
if (!function_exists('curl_init')) {
    throw new CoolsmsSystemException('Coolsms needs the CURL PHP extension.', 301);
}
if (!function_exists('json_decode')) {
    throw new CoolsmsSystemException('Coolsms needs the JSON PHP extension.', 301);
}

/**
 * @class Coolsms
 * @brief Coolsms Rest API core class, using the Rest API
 */
class Coolsms
{
    const HOST = "https://api.coolsms.co.kr";
    const SDK_VERSION = "2.0";

    private $api_name = "sms";
    private $api_version = "2";
    private $api_key;
    private $api_secret;
    private $resource;
    private $is_post;
    private $result;
    private $basecamp;
    private $user_agent;
    private $content;

    /**
     * @brief Construct
     */
    public function __construct($api_key, $api_secret, $basecamp = false)
    {
        $this->api_key = $api_key;
        $this->api_secret = $api_secret;
        if (isset($_SERVER['HTTP_USER_AGENT'])) $this->user_agent = $_SERVER['HTTP_USER_AGENT'];
        if ($basecamp) $this->basecamp = true;
    }

    /**
     * @brief Process curl
     */
    public function curlProcess()
    {
        $ch = curl_init(); 
        if (!$ch) throw new CoolsmsSystemException(curl_error($ch), 399);
        // Set url. is_post true = POST , false = GET
        if ($this->is_post) {
            $url = sprintf("%s/%s/%s/%s", self::HOST, $this->api_name, $this->api_version, $this->resource);
        } else {
            $url = sprintf("%s/%s/%s/%s?%s", self::HOST, $this->api_name, $this->api_version, $this->resource, $this->content);
        }

        // Set curl info
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // check SSL certificate
        //curl_setopt($ch, CURLOPT_SSLVERSION, 3); // SSL protocol version (need for https connect, 3 -> SSLv3)
        curl_setopt($ch, CURLOPT_HEADER, 0); // include the header in the output (1 = true, 0 = false) 
        curl_setopt($ch, CURLOPT_POST, $this->is_post); // POST GET method

        // set POST data
        if ($this->is_post) {
            $header = array("Content-Type:multipart/form-data");

            // route가 있으면 header에 붙여준다. substr 해준 이유는 앞에 @^가 붙기 때문에 자르기 위해서.
            if (isset($this->content['route'])) $header[] = "User-Agent:" . substr($this->content['route'], 1);

            curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type:multipart/form-data"));
            curl_setopt($ch, CURLOPT_POSTFIELDS, $this->content); 
        }
        curl_setopt($ch, CURLOPT_TIMEOUT, 10); // TimeOut value
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // curl_exec() result output (1 = true, 0 = false)

        $this->result = json_decode(curl_exec($ch));

        // unless http status code is 200. throw exception.
        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($http_code != 200) throw new CoolsmsServerException($this->result, $http_code);

        // check curl errors
        if (curl_errno($ch)) throw new CoolsmsSystemException(curl_error($ch), 399); 

        curl_close($ch);
    }

    /**
     * @brief set http body content
     */
    private function setContent($options)
    {
        // POST method content
        if ($this->is_post) {
            $this->content = array();
            foreach ($options as $key => $val) {
                if ($key != "text") $val = trim($val);
                
                if ($key == "image") {
                    $this->content[$key] = curl_file_create(realpath($val));
                } else {
                    $this->content[$key] = sprintf("%s", $val);
                }
            }
            return;
        }

        // GET method content
        foreach ($options as $key => $val) {
            if ($key != "text") $val = trim($val);
            $this->content .= $key . "=" . urlencode($val) . "&";
        }
    }

    /**
     * @biref Make a signature with hash_hamac then return the signature
     */
    private function getSignature($timestamp, $salt)
    {
        return hash_hmac('md5', $timestamp . $salt, $this->api_secret);
    }

    /**
     * @brief Set authenticate information
     */
    protected function addInfos($options = null)
    {
        if (!isset($options)) $options = new \stdClass();
        if (!isset($options->User_Agent)) $options->User_Agent = sprintf("PHP REST API %s", $this->api_version);
        if (!isset($options->os_platform)) $options->os_platform = $this->getOS();
        if (!isset($options->dev_lang)) $options->dev_lang = sprintf("PHP %s", phpversion());
        if (!isset($options->sdk_version)) $options->sdk_version = sprintf("PHP SDK %s", self::SDK_VERSION);

        // set salt & timestamp
        $options->salt = uniqid();
        $options->timestamp = (string)time();

        // If basecamp is true '$coolsms_user' use
        isset($this->basecamp) ? $options->coolsms_user = $this->api_key : $options->api_key = $this->api_key;

        $options->signature = $this->getSignature($options->timestamp, $options->salt);
        $this->setContent($options);
    }

    /**
     * @brief set api resource and http method type
     * @param string  $resource  [required] related information. http://www.coolsms.co.kr/REST_API
     * @param boolean $is_post  [optional] GET = false, POST = true
     */
    protected function setResource($resource, $is_post = false)
    {
        $this->resource = $resource;
        $this->is_post = $is_post;
    }

    /**
     * @brief https request using rest api 
     * @param string  $resource [required]
     * @param object  $options  [optional]
     * @param boolean $is_post  [optional] GET = false, POST = true
     * @return mixed
     */
    protected function request($resource, $options = null, $is_post = false)
    {
        if (!$resource) throw new CoolsmsSDKException('resource is required', 201);

        // set http method and rest api path
        $this->setResource($resource, $is_post);

        // set contents
        $this->addInfos($options);

        // https request
        $this->curlProcess();

        // return result
        return $this->getResult();
    }

    /**
     * @brief Return result
     */
    public function getResult()
    {
        return $this->result;
    }

    /**
     * @brief set api name and api version
     * @param string  $api_name    [required] 'sms', 'senderid', 'image'
     * @param integer $api_version [required]
     */
    public function setApiConfig($api_name, $api_version)
    {
        if (!isset($api_name) || !isset($api_version)) throw new CoolsmsSDKException('API name and version is requried', 201);
        $this->api_name = $api_name;
        $this->api_version = $api_version;
    }

    /**
     * @brief Return user's current OS
     */
    function getOS()
    {
        $user_agent = $this->user_agent;
        $os_platform = "Unknown OS Platform";
        $os_array = array(
                                '/windows nt 10/i'     =>  'Windows 10',
                                '/windows nt 6.3/i'     =>  'Windows 8.1',
                                '/windows nt 6.2/i'     =>  'Windows 8',
                                '/windows nt 6.1/i'     =>  'Windows 7',
                                '/windows nt 6.0/i'     =>  'Windows Vista',
                                '/windows nt 5.2/i'     =>  'Windows Server 2003/XP x64',
                                '/windows nt 5.1/i'     =>  'Windows XP',
                                '/windows xp/i'         =>  'Windows XP',
                                '/windows nt 5.0/i'     =>  'Windows 2000',
                                '/windows me/i'         =>  'Windows ME',
                                '/win98/i'              =>  'Windows 98',
                                '/win95/i'              =>  'Windows 95',
                                '/win16/i'              =>  'Windows 3.11',
                                '/macintosh|mac os x/i' =>  'Mac OS X',
                                '/mac_powerpc/i'        =>  'Mac OS 9',
                                '/linux/i'              =>  'Linux',
                                '/ubuntu/i'             =>  'Ubuntu',
                                '/iphone/i'             =>  'iPhone',
                                '/ipod/i'               =>  'iPod',
                                '/ipad/i'               =>  'iPad',
                                '/android/i'            =>  'Android',
                                '/blackberry/i'         =>  'BlackBerry',
                                '/webos/i'              =>  'Mobile'
                         );

        foreach ($os_array as $regex => $value) { 
            if (preg_match($regex, $user_agent)) {
                $os_platform = $value;
            }
        }   
        return $os_platform;
    }

    /**
     * @brief Return user's current browser
     */
    function getBrowser() 
    {
        $user_agent = $this->user_agent;
        $browser = "Unknown Browser";
        $browser_array = array(
                                '/msie/i'       =>  'Internet Explorer',
                                '/firefox/i'    =>  'Firefox',
                                '/safari/i'     =>  'Safari',
                                '/chrome/i'     =>  'Chrome',
                                '/opera/i'      =>  'Opera',
                                '/netscape/i'   =>  'Netscape',
                                '/maxthon/i'    =>  'Maxthon',
                                '/konqueror/i'  =>  'Konqueror',
                                '/mobile/i'     =>  'Handheld Browser'
                         );
        foreach ($browser_array as $regex => $value) { 
            if (preg_match($regex, $user_agent)) {
                $browser = $value;
            }
        }
        return $browser;
    }
}