<?php
/**
 * Copyright (c) 2010 VZnet Netzwerke Ltd.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @author    Bastian Hofmann <bhfomann@vz.net>
 * @author    Vyacheslav Slinko <vyacheslav.slinko@gmail.com>
 * @copyright 2010 VZnet Netzwerke Ltd.
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

namespace OAuth2;

class HttpClient
{
    /**
     * @var string
     */
    private $_url;

    /**
     * @var string
     */
    private $_method;

    /**
     * @var string
     */
    private $_parameters;

    /**
     * @var array
     */
    private $_requestHeader;

    /**
     * @var string
     */
    private $_response;

    /**
     * @var array
     */
    private $_headers;

    /**
     * @var array
     */
    private $_info;

    /**
     * @var boolean
     */
    private $_debug = false;

    /**
     * @param string $url
     * @param string $method
     * @param string $parameters
     * @param array $header  any additional header which should be set
     */
    public function __construct($url, $method, $parameters = null, array $header = array()) {
        $this->_url = $url;
        $this->_method = $method;
        $this->_parameters = $parameters;
        $this->_requestHeader = $header;
    }

    /**
     * parses a string with two delimiters to an array
     *
     * example:
     *
     * param1=value1&param2=value2
     *
     * will result with delimiters & and = to
     *
     * array(
     *   'param1' => 'value1',
     *   'param2' => 'value2',
     * )
     *
     * @param string $string
     * @param string $firstDelimiter
     * @param string $secondDelimiter
     * @return array
     */
    public static function parseStringToArray($string, $firstDelimiter, $secondDelimiter) {
        $resultArray = array();
        $parts = explode($firstDelimiter, $string);
        foreach ($parts as $part) {
            $partsPart = explode($secondDelimiter, $part);
            $resultArray[$partsPart[0]] = isset($partsPart[1]) ? trim($partsPart[1]) : '';
        }
        return $resultArray;
    }

    /**
     * executes the curl request
     */
    public function execute() {
        $ch = curl_init();

        if ($this->_method === 'POST') {
            curl_setopt($ch, CURLOPT_URL, $this->_url);
            curl_setopt($ch, CURLOPT_POST, 1);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $this->_parameters);
        } else {
            curl_setopt($ch, CURLOPT_URL, $this->_url . ($this->_parameters ? '?' . $this->_parameters : ''));
        }

        curl_setopt($ch, CURLOPT_HEADER, 1);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

        if (! empty($this->_requestHeader)) {
            curl_setopt($ch, CURLOPT_HTTPHEADER, $this->_requestHeader);
        }

        $fullResponse = curl_exec($ch);
        $this->_info = curl_getinfo($ch);

        $this->_response = substr($fullResponse, $this->_info['header_size'], strlen($fullResponse));
        if ($this->_response === false) {
            $this->_response = '';
        }
        $headers = rtrim(substr($fullResponse, 0, $this->_info['header_size']));

        $this->_headers = static::parseStringToArray($headers, PHP_EOL, ':');

        if ($this->_debug) {
            echo "<pre>";
            print_r($this->_url);
            echo PHP_EOL;
            print_r($this->_headers);
            echo PHP_EOL;
            print_r($this->_response);
            echo "</pre>";
        }

        curl_close($ch);
    }

    /**
     * @return string
     */
    public function getResponse() {
        return $this->_response;
    }

    /**
     * @return array
     */
    public function getHeaders() {
        return $this->_headers;
    }

    /**
     * @param boolean $debug
     */
    public function setDebug($debug) {
        $this->_debug = $debug;
    }
}