<?php

/*

 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between

 * Copyright (C) 2006-2009 Dan Fuhry

 *

 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2 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 details.

 */

/**

 * Class for formatting and displaying tag clouds. Loosely based the reference cloud engine from <http://www.lotsofcode.com/php/tutorials/tag-cloud>.

 * @package Enano

 * @subpackage Presentation/UI

 * @copyright (C) 2007 Dan Fuhry

 * @license GNU General Public License, version 2 or at your option any later versionc

 */

class TagCloud

{

	/**

 	* The list of words in the cloud.

 	* @var array

 	*/

	var $words = array();

	/**

 	* Constructor.

 	* @param array Optional. An initial list of words, just a plain old array.

 	*/

	function __construct($words = array())

	{

		if ( count($words) > 0 )

		{

			foreach ( $words as $word )

				$this->add_word($word);

		}

	}

	/**

 	* Adds a word into the word list.

 	* @param string The word to add

 	*/

	function add_word($word)

	{

		$word = sanitize_tag($word);

		if ( isset($this->words[$word]) )

			$this->words[$word] += 1;

		else

			$this->words[$word] = 1;

	}

	/**

 	* Returns the total size of the cloud.

 	* @return int

 	*/

	function get_cloud_size()

	{

		return array_sum($this->words);

	}

	/**

 	* Shuffles the cloud.

 	*/

	function shuffle_cloud()

	{

		$keys = array_keys($this->words);

		if ( !$keys || empty($keys) || !is_array($keys) )

			return null;

		shuffle($keys);

		if ( !$keys || empty($keys) || !is_array($keys) )

			return null;

		$temp = $this->words;

		$this->words = array();

		foreach ( $keys as $word )

		{

			$this->words[$word] = $temp[$word];

		}

		unset($temp);

	}

	/**

 	* Returns the popularity index (scale class) for a 1-100 number.

 	* @param int

 	* @return int

 	*/

	function get_scale_class($val)

	{

		$ret = 0;

		if ( $val >= 99 )

			$ret = 1;

		else if ( $val >= 70 )

			$ret = 2;

		else if ( $val >= 60 )

			$ret = 3;

		else if ( $val >= 50 )

			$ret = 4;

		else if ( $val >= 40 )

			$ret = 5;

		else if ( $val >= 30 )

			$ret = 6;

		else if ( $val >= 20 )

			$ret = 7;

		else if ( $val >= 10 )

			$ret = 8;

		else if ( $val >= 5 )

			$ret = 9;

		return $ret;

	}

	/**

 	* Generates and returns HTML for the cloud.

 	* @param string Optional. The CSS class applied to all <span> tags. Can be "normal" or "small". Defaults to "normal".

 	* @param string Optional. The alignment for the div. Defaults to "center".

 	* @return string

 	*/

	function make_html($span_class = 'normal', $div_align = 'center')

	{

		global $lang;

		$html = array();

		$max  = max($this->words);

		$size = $this->get_cloud_size();

		$inc = 0;

		if ( count($this->words) > 0 )

		{

			foreach ( $this->words as $word => $popularity )

			{

				$inc++;

				$word = htmlspecialchars($word);

				$percent = ( $popularity / $max ) * 100;

				$index = $this->get_scale_class($percent);

				$newline = ( $inc == 5 ) ? "<br />" : '';

				( $inc == 5 ) ? $inc = 0 : null;

				$url = makeUrlNS('Special', 'TagCloud/' . htmlspecialchars($word));

				$popstring = ( $popularity == 1 ) ? $lang->get('pagetools_tagcloud_tip_popularity_one') : $lang->get('pagetools_tagcloud_tip_popularity_plural', array('popularity' => $popularity));

				$html[] = "<span class='tc_word_{$span_class} tc_{$span_class}_index_{$index}'><a href='$url' title='$popstring'>$word</a></span>"; // $newline";

			}

		}

		$html = '<div style="text-align: ' . $div_align . '; margin: 0 auto; max-width: 400px;">' . implode("\n", $html) . '</div>';

		return $html;

	}

}

?>