<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');


class Esignature {

    protected $url = 'https://capi-eval.signnow.com/api';
    protected $encoded_client_credentials  = 'MGZjY2RiYzczNTgxY2EwZjliZjhjMzc5ZTZhOTY4MTM6MzcxOWExMjRiY2ZjMDNjNTM0ZDRmNWMwNWI1YTE5NmI=';
    protected $access_token;
    protected $data;
    protected $document_id;

    public function __construct($params)
    {
        $this->data = $params;
    }

    public function send()
    {

        if (!$this->getToken()) {
            return false;
        }

        if (!$this->uploadDocument()) {
            return false;
        }

        if (!$this->addSignature()) {
            return false;
        }


        if (!$this->sendInvite()) {
            return false;
        }
    }

    /**
     * Fetch auth token
     *
     * @return bool
     */
    protected function getToken()
    {
        $headers = array(
            "Authorization: Basic ".$this->encoded_client_credentials."",
            "Content-Type: application/x-www-form-urlencoded;charset=UTF-8"
        );

        $fields = array(
            'username' => urlencode('gafitescu@gmail.com'),
            'password' => urlencode('pass2sign'),
            'grant_type' => urlencode('password')
        );

        $fields_string = '';
        foreach ($fields as $key => $value) {
            $fields_string .= $key.'='.$value.'&';
        }
        rtrim($fields_string, '&');

        $arResponse = $this->curl('/oauth2/token', $headers, $fields_string);
        if (isset($arResponse->access_token)) {
            $this->access_token = $arResponse->access_token;
            return true;
        } else {
            return false;
        }
    }

    protected function uploadDocument()
    {
        $headers = array(
            "Authorization: Bearer ".$this->access_token,
            "Content-Type: multipart/form-data"
        );

        $file = $this->getCurlValue($this->data['file']);

        $data = array('file' => $file);
        $arResponse = $this->curl('/document', $headers, $data);
        if (isset($arResponse->id)) {
            $this->document_id = $arResponse->id;
            return true;
        } else {
            return false;
        }
    }

    private function getCurlValue($filename)
    {
        $contentType = 'application/pdf' ;
        $postname = 'contract_'.date("d-m-Y H:i:s").'.pdf';

        if (function_exists('curl_file_create')) {
            return curl_file_create($filename, $contentType, $postname);
        }

        // Use the old style if using an older version of PHP
        $value = "@{$this->filename};filename=" . $postname;
        if ($contentType) {
            $value .= ';type=' . $contentType;
        }

        return $value;
    }

    protected function addSignature()
    {
        $nrPages = $this->getNrOfPagesFromPdf($this->data['file']) - 1; // 0 index pages

        $json_encoded_fields = array(
            array(
                "x" => 90,
                "y" => 786,
                "width" => 285,
                "height" => 25,
                "page_number" => $nrPages,
                "required"=> true,
                "role" => "Client",
                "type" => "signature"
            )
        );

        $data = json_encode(
            array(
                'fields' => $json_encoded_fields
            )
        );

        $headers = array(
            "Authorization: Bearer ".$this->access_token,
            "Content-Type: application/json"
        );


        $arCustomOption = array(
            CURLOPT_CUSTOMREQUEST => "PUT"
        );


        $arResponse = $this->curl('/document/'.$this->document_id, $headers, $data, $arCustomOption);
        if (isset($arResponse->id)) {
            return true;
        } else {
            return false;
        }
    }

    protected function sendInvite()
    {
        $headers = array(
            "Authorization: Bearer ".$this->access_token,
            "Content-Type: application/json"
        );

        $data = json_encode(array(
            "to" =>  'receiver@gmail.com',
            "from" => "gafitescu@email.com"
        ));

        $arResponse = $this->curl('/document/'.$this->document_id.'/invite?email=disable', $headers, $data);
        echo __METHOD__;
        var_dump($arResponse);
    }

    protected function fetchUser()
    {
        $headers = array(
            "Authorization: Basic ".$this->encoded_client_credentials,
            "Content-Type: application/json"
        );

        $data = json_encode(
                array(
                    'email' => 'usefortorrent@gmail.com',
                    'password' => 'password',
                    'first_name' => 'James',
                    'last_name' => 'Joyce'
            )
        );

        $arResponse = $this->curl('/user', $headers, $data);
        var_dump($arResponse);
    }

    private function getNrOfPagesFromPdf($pdfname)
    {
        $pdftext = file_get_contents($pdfname);
        $num = preg_match_all("/\/Page\W/", $pdftext, $dummy);
        return $num;
    }



    private function curl($resource, $headers, $data, $arCustomOptions = array())
    {
        $ch = curl_init();

        $options = array(
            CURLOPT_URL => $this->url.$resource,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_HTTPHEADER => $headers,
            CURLINFO_HEADER_OUT => false,
            CURLOPT_HEADER => false,
            CURLOPT_POST => true,
            CURLOPT_POSTFIELDS => $data
        );

        if (!empty($arCustomOptions)) {
            foreach ($arCustomOptions as $option => $value) {
                $options[$option] = $value;
            }
        }

        curl_setopt_array($ch, $options);
        $result = curl_exec($ch);
        var_dump($result);
        curl_close($ch);
        return json_decode($result);

    }
}


// usage:
$params = array('file' => $file);
        $this->load->library('Esignature', $params,'esignature');
        $success = $this->esignature->send();


?>