<?php
/*****************************************************************************
 * ManageTags.php
 * Contains the controller with the admin's list of tags.
 *
 * Kabuki CMS (C) 2013-2015, Aaron van Geffen
 *****************************************************************************/

class ManageTags extends HTMLController
{
	public function __construct()
	{
		// Ensure it's just admins at this point.
		if (!Registry::get('user')->isAdmin())
			throw new NotAllowedException();

		if (isset($_REQUEST['create']) && isset($_POST['tag']))
			$this->handleTagCreation();

		$options = [
			'columns' => [
				'id_post' => [
					'value' => 'id_tag',
					'header' => 'ID',
					'is_sortable' => true,
				],
				'tag' => [
					'header' => 'Tag',
					'is_sortable' => true,
					'parse' => [
						'link' => BASEURL . '/managetag/?id={ID_TAG}',
						'data' => 'tag',
					],
				],
				'slug' => [
					'header' => 'Slug',
					'is_sortable' => true,
					'parse' => [
						'link' => BASEURL . '/managetag/?id={ID_TAG}',
						'data' => 'slug',
					],
				],
				'count' => [
					'header' => 'Cardinality',
					'is_sortable' => true,
					'value' => 'count',
				],
			],
			'start' => !empty($_GET['start']) ? (int) $_GET['start'] : 0,
			'sort_order' => !empty($_GET['order']) ? $_GET['order'] : null,
			'sort_direction' => !empty($_GET['dir']) ? $_GET['dir'] : null,
			'title' => 'Manage tags',
			'no_items_label' => 'No tags meet the requirements of the current filter.',
			'items_per_page' => 25,
			'base_url' => BASEURL . '/managetags/',
			'get_data' => function($offset = 0, $limit = 15, $order = '', $direction = 'up') {
				if (!in_array($order, ['id_post', 'tag', 'slug', 'count']))
					$order = 'tag';
				if (!in_array($direction, ['up', 'down']))
					$direction = 'up';

				$data = Registry::get('db')->queryAssocs('
					SELECT *
					FROM tags
					ORDER BY {raw:order}
					LIMIT {int:offset}, {int:limit}',
					[
						'order' => $order . ($direction == 'up' ? ' ASC' : ' DESC'),
						'offset' => $offset,
						'limit' => $limit,
					]);

				return [
					'rows' => $data,
					'order' => $order,
					'direction' => ($direction == 'up' ? 'up' : 'down'),
				];
			},
			'get_count' => function() {
				return Registry::get('db')->queryValue('
					SELECT COUNT(*)
					FROM tags');
			}
		];

		$table = new GenericTable($options);
		parent::__construct('Tag management - Page ' . $table->getCurrentPage() .' - ' . SITE_TITLE);
		$this->page->adopt(new TabularData($table));
	}

	private function handleTagCreation()
	{
		header('Content-Type: text/json; charset=utf-8');

		// It better not already exist!
		if (Tag::exactMatch($_POST['tag']))
		{
			echo '{"error":"Tag already exists!"}';
			exit;
		}

		$label = htmlentities(trim($_POST['tag']));
		$slug = strtr(strtolower($label), [' ' => '-']);
		$tag = Tag::createNew([
			'tag' => $label,
			'slug' => $slug,
		]);

		// Did we succeed?
		if (!$tag)
		{
			echo '{"error":"Could not create tag."}';
			exit;
		}

		echo json_encode([
			'label' => $tag->tag,
			'id_tag' => $tag->id_tag,
		]);
		exit;
	}
}