<?php

/*
	Question2Answer by Gideon Greenspan and contributors

	http://www.question2answer.org/


	File: qa-plugin/tag-cloud-widget/qa-tag-cloud.php
	Version: See define()s at top of qa-include/qa-base.php
	Description: Widget module class for tag cloud plugin


	This program 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 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 more details.

	More about this license: http://www.question2answer.org/license.php
*/

	class qa_tag_cloud {

		public function option_default($option)
		{
			if ($option === 'tag_cloud_count_tags')
				return 100;
			if ($option === 'tag_cloud_font_size')
				return 24;
			if ($option === 'tag_cloud_minimal_font_size')
				return 8;
			if ($option === 'tag_cloud_size_popular')
				return true;
		}


		public function admin_form()
		{
			$saved = qa_clicked('tag_cloud_save_button');

			if ($saved) {
				qa_opt('tag_cloud_count_tags', (int) qa_post_text('tag_cloud_count_tags_field'));
				qa_opt('tag_cloud_font_size', (int) qa_post_text('tag_cloud_font_size_field'));
				qa_opt('tag_cloud_minimal_font_size', (int) qa_post_text('tag_cloud_minimal_font_size_field'));
				qa_opt('tag_cloud_size_popular', (int) qa_post_text('tag_cloud_size_popular_field'));
			}

			return array(
				'ok' => $saved ? 'Tag cloud settings saved' : null,

				'fields' => array(
					array(
						'label' => 'Maximum tags to show:',
						'type' => 'number',
						'value' => (int) qa_opt('tag_cloud_count_tags'),
						'suffix' => 'tags',
						'tags' => 'name="tag_cloud_count_tags_field"',
					),

					array(
						'label' => 'Biggest font size:',
						'suffix' => 'pixels',
						'type' => 'number',
						'value' => (int) qa_opt('tag_cloud_font_size'),
						'tags' => 'name="tag_cloud_font_size_field"',
					),

					array(
						'label' => 'Smallest allowed font size:',
						'suffix' => 'pixels',
						'type' => 'number',
						'value' => (int) qa_opt('tag_cloud_minimal_font_size'),
						'tags' => 'name="tag_cloud_minimal_font_size_field"',
					),

					array(
						'label' => 'Font size represents tag popularity',
						'type' => 'checkbox',
						'value' => qa_opt('tag_cloud_size_popular'),
						'tags' => 'name="tag_cloud_size_popular_field"',
					),
				),

				'buttons' => array(
					array(
						'label' => 'Save Changes',
						'tags' => 'name="tag_cloud_save_button"',
					),
				),
			);
		}


		public function allow_template($template)
		{
			$allowed = array(
				'activity', 'qa', 'questions', 'hot', 'ask', 'categories', 'question',
				'tag', 'tags', 'unanswered', 'user', 'users', 'search', 'admin', 'custom',
			);
			return in_array($template, $allowed);
		}


		public function allow_region($region)
		{
			return ($region === 'side');
		}


		public function output_widget($region, $place, $themeobject, $template, $request, $qa_content)
		{
			require_once QA_INCLUDE_DIR . 'qa-db-selects.php';

			$populartags = qa_db_single_select(qa_db_popular_tags_selectspec(0, (int) qa_opt('tag_cloud_count_tags')));

			$maxcount = reset($populartags);

			$themeobject->output(sprintf('<h2 style="margin-top: 0; padding-top: 0;">%s</h2>', qa_lang_html('main/popular_tags')));

			$themeobject->output('<div style="font-size: 10px;">');

			$maxsize = qa_opt('tag_cloud_font_size');
			$minsize = qa_opt('tag_cloud_minimal_font_size');
			$scale = qa_opt('tag_cloud_size_popular');
			$blockwordspreg = qa_get_block_words_preg();

			foreach ($populartags as $tag => $count) {
				$matches = qa_block_words_match_all($tag, $blockwordspreg);
				if (empty($matches)) {
					if ($scale) {
						$size = number_format($maxsize * $count / $maxcount, 1);
						if ($size < $minsize)
							$size = $minsize;
					} else
						$size = $maxsize;

					$themeobject->output(sprintf('<a href="%s" style="font-size: %dpx; vertical-align: baseline;">%s</a>', qa_path_html('tag/' . $tag), $size, qa_html($tag)));
				}
			}

			$themeobject->output('</div>');
		}

	}


/*
	Omit PHP closing tag to help avoid accidental output
*/