<?php
defined('_JEXEC') or die;

/**
 * This file is part of googl-php
 *
 * https://github.com/sebi/googl-php
 *
 * Copyright 2011 by Sebastian Wyder <sebastian.wyder@sunrise.ch>
 *
 * googl-php is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
class GooglApi
{
	public $extended;
	private $target;
	private $apiKey;
	private $ch;

	function __construct($apiKey = null)
	{

		# Extended output mode
		$extended = false;

		# Set Google Shortener API target
		$this->target = 'https://www.googleapis.com/urlshortener/v1/url?';

		# Set API key if available
		if ($apiKey != null)
		{
			$this->apiKey = $apiKey;
			$this->target .= 'key=' . $apiKey . '&';
		}

		# Initialize cURL
		$this->ch = curl_init();
		# Set our default target URL
		curl_setopt($this->ch, CURLOPT_URL, $this->target);
		# We don't want the return data to be directly outputted, so set RETURNTRANSFER to true
		curl_setopt($this->ch, CURLOPT_RETURNTRANSFER, true);
	}

	# Shorten a URL
	public function shorten($url, $extended = false)
	{

		# Payload
		$data        = array('longUrl' => $url);
		$data_string = '{"longUrl": "' . $url . '"}';

		# Set cURL options
		curl_setopt($this->ch, CURLOPT_POST, count($data));
		curl_setopt($this->ch, CURLOPT_POSTFIELDS, $data_string);
		curl_setopt($this->ch, CURLOPT_HTTPHEADER, Array('Content-Type: application/json'));

		if ($extended || $this->extended)
		{
			return json_decode(curl_exec($this->ch));
		}
		else
		{
			return json_decode(curl_exec($this->ch))->id;
		}
	}

	# Expand an already shortened URL
	public function expand($url, $extended = false)
	{

		# Set cURL options
		curl_setopt($this->ch, CURLOPT_URL, $this->target . 'shortUrl=' . $url);

		if ($extended || $this->extended)
		{
			return json_decode(curl_exec($this->ch));
		}
		else
		{
			return json_decode(curl_exec($this->ch))->longUrl;
		}
	}

	function __destruct()
	{

		# Close the curl handle
		curl_close($this->ch);
		# Nulling the curl handle
		$this->ch = null;
	}
}

?>