<?php

namespace Webkul\WooCommerceBundle\Classes; 

/**
 * wocoomerce api client
 *
 */
class Oauth
{
    const API_VERSION = 'v2';

    private $consumerKey;
    private $consumerSecret;

    public function __construct($consumerKey, $consumerSecret)
    {
        $this->consumerKey = $consumerKey; 
        $this->consumerSecret = $consumerSecret;
    }

    public function getApiUrl($url, $method, $params = [])
    {
        $extraParam = parse_url($url);
        $extraParam = isset($extraParam['query']) ? $extraParam['query'] : null;
        if($extraParam) {
            parse_str($extraParam, $extraparameters);
            $params = array_merge($params, $extraparameters);
        }
        
        $url = strtok($url, '?');
        
        $method = strtoupper($method);         
        $oauthTimestamp = time(); 
        
      
        $parameters = array_merge($params, [
            'oauth_consumer_key'     => $this->consumerKey,
            'oauth_timestamp'        => $oauthTimestamp,
            'oauth_nonce'            => rand(10000, 1000000),
            'oauth_signature_method' => 'HMAC-SHA256',
        ]);

        // START Generate OAuth Signature
        $query = [];
        $normalizedParameters = [];
        foreach ($parameters as $key => $value) {
            $key   = str_replace('%', '%25', rawurlencode(rawurldecode($key)));
            $value = str_replace('%', '%25', rawurlencode(rawurldecode($value)));
            $normalizedParameters[$key] = $value;
        }
        uksort($normalizedParameters, 'strcmp');

        // Set query string.
        foreach ($normalizedParameters as $key => $value) {
            $query[] = $key . '%3D' . $value; // Join with equals sign.
        }

        $queryString  = implode('%26', $query); // Join with ampersand.
        $stringToSign = $method . '&' . rawurlencode($url) . '&' . $queryString;
        $secret       = $this->consumerSecret;

        if(strpos($url, 'wp-json') !== false) {
            $secret .= '&';
        }

        $parameters['oauth_signature'] = base64_encode(hash_hmac('SHA256', $stringToSign, $secret, true));
        // END Generate OAuth Signature

        // START Sorting Parameters
        uksort($parameters, 'strcmp');

        foreach ($parameters as $key => $value) {
            if (is_array($value)) {
                uksort($parameters[$key], 'strcmp');
            }
        }

        return $url . '?' . http_build_query($parameters);
    }

    public function addAuthentication(&$ch, $url, $method, $parameters)
    {
        if('resource' == gettype($ch)) {
            $url = $this->getApiUrl($url, $method, $parameters);
            curl_setopt($ch, CURLOPT_URL, $url);
                    
            $headers = [
                'Content-Type: application/json'
            ];
            curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        }
    }
}