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<?php

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP

 *

 * This content is released under the MIT License (MIT)

 *

 * Copyright (c) 2014 - 2016, British Columbia Institute of Technology

 *

 * 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.

 *

 * @package	CodeIgniter

 * @author	EllisLab Dev Team

 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)

 * @copyright	Copyright (c) 2014 - 2016, British Columbia Institute of Technology (http://bcit.ca/)

 * @license	http://opensource.org/licenses/MIT	MIT License

 * @link	https://codeigniter.com

 * @since	Version 1.0.0

 * @filesource

 */

defined('BASEPATH') OR exit('No direct script access allowed');

/**

 * Pagination Class

 *

 * @package		CodeIgniter

 * @subpackage	Libraries

 * @category	Pagination

 * @author		EllisLab Dev Team

 * @link		https://codeigniter.com/user_guide/libraries/pagination.html

 */

class CI_Pagination {

	/**

	 * Base URL

	 *

	 * The page that we're linking to

	 *

	 * @var	string

	 */

	protected $base_url		= '';

	/**

	 * Prefix

	 *

	 * @var	string

	 */

	protected $prefix = '';

	/**

	 * Suffix

	 *

	 * @var	string

	 */

	protected $suffix = '';

	/**

	 * Total number of items

	 *

	 * @var	int

	 */

	protected $total_rows = 0;

	/**

	 * Number of links to show

	 *

	 * Relates to "digit" type links shown before/after

	 * the currently viewed page.

	 *

	 * @var	int

	 */

	protected $num_links = 2;

	/**

	 * Items per page

	 *

	 * @var	int

	 */

	public $per_page = 10;

	/**

	 * Current page

	 *

	 * @var	int

	 */

	public $cur_page = 0;

	/**

	 * Use page numbers flag

	 *

	 * Whether to use actual page numbers instead of an offset

	 *

	 * @var	bool

	 */

	protected $use_page_numbers = FALSE;

	/**

	 * First link

	 *

	 * @var	string

	 */

	protected $first_link = '‹ First';

	/**

	 * Next link

	 *

	 * @var	string

	 */

	protected $next_link = '>';

	/**

	 * Previous link

	 *

	 * @var	string

	 */

	protected $prev_link = '<';

	/**

	 * Last link

	 *

	 * @var	string

	 */

	protected $last_link = 'Last ›';

	/**

	 * URI Segment

	 *

	 * @var	int

	 */

	protected $uri_segment = 0;

	/**

	 * Full tag open

	 *

	 * @var	string

	 */

	protected $full_tag_open = '';

	/**

	 * Full tag close

	 *

	 * @var	string

	 */

	protected $full_tag_close = '';

	/**

	 * First tag open

	 *

	 * @var	string

	 */

	protected $first_tag_open = '';

	/**

	 * First tag close

	 *

	 * @var	string

	 */

	protected $first_tag_close = '';

	/**

	 * Last tag open

	 *

	 * @var	string

	 */

	protected $last_tag_open = '';

	/**

	 * Last tag close

	 *

	 * @var	string

	 */

	protected $last_tag_close = '';

	/**

	 * First URL

	 *

	 * An alternative URL for the first page

	 *

	 * @var	string

	 */

	protected $first_url = '';

	/**

	 * Current tag open

	 *

	 * @var	string

	 */

	protected $cur_tag_open = '<strong>';

	/**

	 * Current tag close

	 *

	 * @var	string

	 */

	protected $cur_tag_close = '</strong>';

	/**

	 * Next tag open

	 *

	 * @var	string

	 */

	protected $next_tag_open = '';

	/**

	 * Next tag close

	 *

	 * @var	string

	 */

	protected $next_tag_close = '';

	/**

	 * Previous tag open

	 *

	 * @var	string

	 */

	protected $prev_tag_open = '';

	/**

	 * Previous tag close

	 *

	 * @var	string

	 */

	protected $prev_tag_close = '';

	/**

	 * Number tag open

	 *

	 * @var	string

	 */

	protected $num_tag_open = '';

	/**

	 * Number tag close

	 *

	 * @var	string

	 */

	protected $num_tag_close = '';

	/**

	 * Page query string flag

	 *

	 * @var	bool

	 */

	protected $page_query_string = FALSE;

	/**

	 * Query string segment

	 *

	 * @var	string

	 */

	protected $query_string_segment = 'per_page';

	/**

	 * Display pages flag

	 *

	 * @var	bool

	 */

	protected $display_pages = TRUE;

	/**

	 * Attributes

	 *

	 * @var	string

	 */

	protected $_attributes = '';

	/**

	 * Link types

	 *

	 * "rel" attribute

	 *

	 * @see	CI_Pagination::_attr_rel()

	 * @var	array

	 */

	protected $_link_types = array();

	/**

	 * Reuse query string flag

	 *

	 * @var	bool

	 */

	protected $reuse_query_string = FALSE;

	/**

	 * Use global URL suffix flag

	 *

	 * @var	bool

	 */

	protected $use_global_url_suffix = FALSE;

	/**

	 * Data page attribute

	 *

	 * @var	string

	 */

	protected $data_page_attr = 'data-ci-pagination-page';

	/**

	 * CI Singleton

	 *

	 * @var	object

	 */

	protected $CI;

	// --------------------------------------------------------------------

	/**

	 * Constructor

	 *

	 * @param	array	$params	Initialization parameters

	 * @return	void

	 */

	public function __construct($params = array())

	{

		$this->CI =& get_instance();

		$this->CI->load->language('pagination');

		foreach (array('first_link', 'next_link', 'prev_link', 'last_link') as $key)

		{

			if (($val = $this->CI->lang->line('pagination_'.$key)) !== FALSE)

			{

				$this->$key = $val;

			}

		}

		$this->initialize($params);

		log_message('info', 'Pagination Class Initialized');

	}

	// --------------------------------------------------------------------

	/**

	 * Initialize Preferences

	 *

	 * @param	array	$params	Initialization parameters

	 * @return	CI_Pagination

	 */

	public function initialize(array $params = array())

	{

		isset($params['attributes']) OR $params['attributes'] = array();

		if (is_array($params['attributes']))

		{

			$this->_parse_attributes($params['attributes']);

			unset($params['attributes']);

		}

		// Deprecated legacy support for the anchor_class option

		// Should be removed in CI 3.1+

		if (isset($params['anchor_class']))

		{

			empty($params['anchor_class']) OR $attributes['class'] = $params['anchor_class'];

			unset($params['anchor_class']);

		}

		foreach ($params as $key => $val)

		{

			if (property_exists($this, $key))

			{

				$this->$key = $val;

			}

		}

		if ($this->CI->config->item('enable_query_strings') === TRUE)

		{

			$this->page_query_string = TRUE;

		}

		if ($this->use_global_url_suffix === TRUE)

		{

			$this->suffix = $this->CI->config->item('url_suffix');

		}

		return $this;

	}

	// --------------------------------------------------------------------

	/**

	 * Generate the pagination links

	 *

	 * @return	string

	 */

	public function create_links()

	{

		// If our item count or per-page total is zero there is no need to continue.

		// Note: DO NOT change the operator to === here!

		if ($this->total_rows == 0 OR $this->per_page == 0)

		{

			return '';

		}

		// Calculate the total number of pages

		$num_pages = (int) ceil($this->total_rows / $this->per_page);

		// Is there only one page? Hm... nothing more to do here then.

		if ($num_pages === 1)

		{

			return '';

		}

		// Check the user defined number of links.

		$this->num_links = (int) $this->num_links;

		if ($this->num_links < 0)

		{

			show_error('Your number of links must be a non-negative number.');

		}

		// Keep any existing query string items.

		// Note: Has nothing to do with any other query string option.

		if ($this->reuse_query_string === TRUE)

		{

			$get = $this->CI->input->get();

			// Unset the controll, method, old-school routing options

			unset($get['c'], $get['m'], $get[$this->query_string_segment]);

		}

		else

		{

			$get = array();

		}

		// Put together our base and first URLs.

		// Note: DO NOT append to the properties as that would break successive calls

		$base_url = trim($this->base_url);

		$first_url = $this->first_url;

		$query_string = '';

		$query_string_sep = (strpos($base_url, '?') === FALSE) ? '?' : '&';

		// Are we using query strings?

		if ($this->page_query_string === TRUE)

		{

			// If a custom first_url hasn't been specified, we'll create one from

			// the base_url, but without the page item.

			if ($first_url === '')

			{

				$first_url = $base_url;

				// If we saved any GET items earlier, make sure they're appended.

				if ( ! empty($get))

				{

					$first_url .= $query_string_sep.http_build_query($get);

				}

			}

			// Add the page segment to the end of the query string, where the

			// page number will be appended.

			$base_url .= $query_string_sep.http_build_query(array_merge($get, array($this->query_string_segment => '')));

		}

		else

		{

			// Standard segment mode.

			// Generate our saved query string to append later after the page number.

			if ( ! empty($get))

			{

				$query_string = $query_string_sep.http_build_query($get);

				$this->suffix .= $query_string;

			}

			// Does the base_url have the query string in it?

			// If we're supposed to save it, remove it so we can append it later.

			if ($this->reuse_query_string === TRUE && ($base_query_pos = strpos($base_url, '?')) !== FALSE)

			{

				$base_url = substr($base_url, 0, $base_query_pos);

			}

			if ($first_url === '')

			{

				$first_url = $base_url.$query_string;

			}

			$base_url = rtrim($base_url, '/').'/';

		}

		// Determine the current page number.

		$base_page = ($this->use_page_numbers) ? 1 : 0;

		// Are we using query strings?

		if ($this->page_query_string === TRUE)

		{

			$this->cur_page = $this->CI->input->get($this->query_string_segment);

		}

		elseif (empty($this->cur_page))

		{

			// Default to the last segment number if one hasn't been defined.

			if ($this->uri_segment === 0)

			{

				$this->uri_segment = count($this->CI->uri->segment_array());

			}

			$this->cur_page = $this->CI->uri->segment($this->uri_segment);

			// Remove any specified prefix/suffix from the segment.

			if ($this->prefix !== '' OR $this->suffix !== '')

			{

				$this->cur_page = str_replace(array($this->prefix, $this->suffix), '', $this->cur_page);

			}

		}

		else

		{

			$this->cur_page = (string) $this->cur_page;

		}

		// If something isn't quite right, back to the default base page.

		if ( ! ctype_digit($this->cur_page) OR ($this->use_page_numbers && (int) $this->cur_page === 0))

		{

			$this->cur_page = $base_page;

		}

		else

		{

			// Make sure we're using integers for comparisons later.

			$this->cur_page = (int) $this->cur_page;

		}

		// Is the page number beyond the result range?

		// If so, we show the last page.

		if ($this->use_page_numbers)

		{

			if ($this->cur_page > $num_pages)

			{

				$this->cur_page = $num_pages;

			}

		}

		elseif ($this->cur_page > $this->total_rows)

		{

			$this->cur_page = ($num_pages - 1) * $this->per_page;

		}

		$uri_page_number = $this->cur_page;

		// If we're using offset instead of page numbers, convert it

		// to a page number, so we can generate the surrounding number links.

		if ( ! $this->use_page_numbers)

		{

			$this->cur_page = (int) floor(($this->cur_page/$this->per_page) + 1);

		}

		// Calculate the start and end numbers. These determine

		// which number to start and end the digit links with.

		$start	= (($this->cur_page - $this->num_links) > 0) ? $this->cur_page - ($this->num_links - 1) : 1;

		$end	= (($this->cur_page + $this->num_links) < $num_pages) ? $this->cur_page + $this->num_links : $num_pages;

		// And here we go...

		$output = '';

		// Render the "First" link.

		if ($this->first_link !== FALSE && $this->cur_page > ($this->num_links + 1 + ! $this->num_links))

		{

			// Take the general parameters, and squeeze this pagination-page attr in for JS frameworks.

			$attributes = sprintf('%s %s="%d"', $this->_attributes, $this->data_page_attr, 1);

			$output .= $this->first_tag_open.'<a href="'.$first_url.'"'.$attributes.$this->_attr_rel('start').'>'

				.$this->first_link.'</a>'.$this->first_tag_close;

		}

		// Render the "Previous" link.

		if ($this->prev_link !== FALSE && $this->cur_page !== 1)

		{

			$i = ($this->use_page_numbers) ? $uri_page_number - 1 : $uri_page_number - $this->per_page;

			$attributes = sprintf('%s %s="%d"', $this->_attributes, $this->data_page_attr, ($this->cur_page - 1));

			if ($i === $base_page)

			{

				// First page

				$output .= $this->prev_tag_open.'<a href="'.$first_url.'"'.$attributes.$this->_attr_rel('prev').'>'

					.$this->prev_link.'</a>'.$this->prev_tag_close;

			}

			else

			{

				$append = $this->prefix.$i.$this->suffix;

				$output .= $this->prev_tag_open.'<a href="'.$base_url.$append.'"'.$attributes.$this->_attr_rel('prev').'>'

					.$this->prev_link.'</a>'.$this->prev_tag_close;

			}

		}

		// Render the pages

		if ($this->display_pages !== FALSE)

		{

			// Write the digit links

			for ($loop = $start - 1; $loop <= $end; $loop++)

			{

				$i = ($this->use_page_numbers) ? $loop : ($loop * $this->per_page) - $this->per_page;

				$attributes = sprintf('%s %s="%d"', $this->_attributes, $this->data_page_attr, $loop);

				if ($i >= $base_page)

				{

					if ($this->cur_page === $loop)

					{

						// Current page

						$output .= $this->cur_tag_open.$loop.$this->cur_tag_close;

					}

					elseif ($i === $base_page)

					{

						// First page

						$output .= $this->num_tag_open.'<a href="'.$first_url.'"'.$attributes.$this->_attr_rel('start').'>'

							.$loop.'</a>'.$this->num_tag_close;

					}

					else

					{

						$append = $this->prefix.$i.$this->suffix;

						$output .= $this->num_tag_open.'<a href="'.$base_url.$append.'"'.$attributes.'>'

							.$loop.'</a>'.$this->num_tag_close;

					}

				}

			}

		}

		// Render the "next" link

		if ($this->next_link !== FALSE && $this->cur_page < $num_pages)

		{

			$i = ($this->use_page_numbers) ? $this->cur_page + 1 : $this->cur_page * $this->per_page;

			$attributes = sprintf('%s %s="%d"', $this->_attributes, $this->data_page_attr, $this->cur_page + 1);

			$output .= $this->next_tag_open.'<a href="'.$base_url.$this->prefix.$i.$this->suffix.'"'.$attributes

				.$this->_attr_rel('next').'>'.$this->next_link.'</a>'.$this->next_tag_close;

		}

		// Render the "Last" link

		if ($this->last_link !== FALSE && ($this->cur_page + $this->num_links + ! $this->num_links) < $num_pages)

		{

			$i = ($this->use_page_numbers) ? $num_pages : ($num_pages * $this->per_page) - $this->per_page;

			$attributes = sprintf('%s %s="%d"', $this->_attributes, $this->data_page_attr, $num_pages);

			$output .= $this->last_tag_open.'<a href="'.$base_url.$this->prefix.$i.$this->suffix.'"'.$attributes.'>'

				.$this->last_link.'</a>'.$this->last_tag_close;

		}

		// Kill double slashes. Note: Sometimes we can end up with a double slash

		// in the penultimate link so we'll kill all double slashes.

		$output = preg_replace('#([^:"])//+#', '\\1/', $output);

		// Add the wrapper HTML if exists

		return $this->full_tag_open.$output.$this->full_tag_close;

	}

	// --------------------------------------------------------------------

	/**

	 * Parse attributes

	 *

	 * @param	array	$attributes

	 * @return	void

	 */

	protected function _parse_attributes($attributes)

	{

		isset($attributes['rel']) OR $attributes['rel'] = TRUE;

		$this->_link_types = ($attributes['rel'])

			? array('start' => 'start', 'prev' => 'prev', 'next' => 'next')

			: array();

		unset($attributes['rel']);

		$this->_attributes = '';

		foreach ($attributes as $key => $value)

		{

			$this->_attributes .= ' '.$key.'="'.$value.'"';

		}

	}

	// --------------------------------------------------------------------

	/**

	 * Add "rel" attribute

	 *

	 * @link	http://www.w3.org/TR/html5/links.html#linkTypes

	 * @param	string	$type

	 * @return	string

	 */

	protected function _attr_rel($type)

	{

		if (isset($this->_link_types[$type]))

		{

			unset($this->_link_types[$type]);

			return ' rel="'.$type.'"';

		}

		return '';

	}

}