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<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP 4.3.2 or newer

 *

 * @package		CodeIgniter

 * @author		ExpressionEngine Dev Team

 * @copyright	Copyright (c) 2008, EllisLab, Inc.

 * @license		http://codeigniter.com/user_guide/license.html

 * @link		http://codeigniter.com

 * @since		Version 1.0

 * @filesource

 */

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

/**

 * Pagination Class

 *

 * @package		CodeIgniter

 * @subpackage	Libraries

 * @category	Pagination

 * @author		ExpressionEngine Dev Team

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

 */

class CI_Pagination {

	var $base_url			= ''; // The page we are linking to

	var $total_rows  		= ''; // Total number of items (database results)

	var $per_page	 		= 10; // Max number of items you want shown per page

	var $num_links			=  2; // Number of "digit" links to show before/after the currently viewed page

	var $cur_page	 		=  0; // The current page being viewed

	var $first_link   		= '‹ First';

	var $next_link			= '>';

	var $prev_link			= '<';

	var $last_link			= 'Last ›';

	var $uri_segment		= 3;

	var $full_tag_open		= '';

	var $full_tag_close		= '';

	var $first_tag_open		= '';

	var $first_tag_close	= ' ';

	var $last_tag_open		= ' ';

	var $last_tag_close		= '';

	var $cur_tag_open		= '&nbsp;<b>';

	var $cur_tag_close		= '</b>';

	var $next_tag_open		= ' ';

	var $next_tag_close		= ' ';

	var $prev_tag_open		= ' ';

	var $prev_tag_close		= '';

	var $num_tag_open		= ' ';

	var $num_tag_close		= '';

	var $page_query_string	= FALSE;

	var $query_string_segment = 'per_page';

	/**

	 * Constructor

	 *

	 * @access	public

	 * @param	array	initialization parameters

	 */

	function CI_Pagination($params = array())

	{

		if (count($params) > 0)

		{

			$this->initialize($params);

		}

		log_message('debug', "Pagination Class Initialized");

	}

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

	/**

	 * Initialize Preferences

	 *

	 * @access	public

	 * @param	array	initialization parameters

	 * @return	void

	 */

	function initialize($params = array())

	{

		if (count($params) > 0)

		{

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

			{

				if (isset($this->$key))

				{

					$this->$key = $val;

				}

			}

		}

	}

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

	/**

	 * Generate the pagination links

	 *

	 * @access	public

	 * @return	string

	 */

	function create_links()

	{

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

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

		{

		   return '';

		}

		// Calculate the total number of pages

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

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

		if ($num_pages == 1)

		{

			return '';

		}

		// Determine the current page number.

		$CI =& get_instance();

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

		{

			if ($CI->input->get($this->query_string_segment) != 0)

			{

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

				// Prep the current page - no funny business!

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

			}

		}

		else

		{

			if ($CI->uri->segment($this->uri_segment) != 0)

			{

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

				// Prep the current page - no funny business!

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

			}

		}

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

		if ($this->num_links < 1)

		{

			show_error('Your number of links must be a positive number.');

		}

		if ( ! is_numeric($this->cur_page))

		{

			$this->cur_page = 0;

		}

		// Is the page number beyond the result range?

		// If so we show the last page

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

		{

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

		}

		$uri_page_number = $this->cur_page;

		$this->cur_page = floor(($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;

		// Is pagination being used over GET or POST?  If get, add a per_page query

		// string. If post, add a trailing slash to the base URL if needed

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

		{

			$this->base_url = rtrim($this->base_url).'&'.$this->query_string_segment.'=';

		}

		else

		{

			$this->base_url = rtrim($this->base_url, '/') .'/';

		}

  		// And here we go...

		$output = '';

		// Render the "First" link

		if  ($this->cur_page > ($this->num_links + 1))

		{

			$output .= $this->first_tag_open.'<a href="'.$this->base_url.'">'.$this->first_link.'</a>'.$this->first_tag_close;

		}

		// Render the "previous" link

		if  ($this->cur_page != 1)

		{

			$i = $uri_page_number - $this->per_page;

			if ($i == 0) $i = '';

			$output .= $this->prev_tag_open.'<a href="'.$this->base_url.$i.'">'.$this->prev_link.'</a>'.$this->prev_tag_close;

		}

		// Write the digit links

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

		{

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

			if ($i >= 0)

			{

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

				{

					$output .= $this->cur_tag_open.$loop.$this->cur_tag_close; // Current page

				}

				else

				{

					$n = ($i == 0) ? '' : $i;

					$output .= $this->num_tag_open.'<a href="'.$this->base_url.$n.'">'.$loop.'</a>'.$this->num_tag_close;

				}

			}

		}

		// Render the "next" link

		if ($this->cur_page < $num_pages)

		{

			$output .= $this->next_tag_open.'<a href="'.$this->base_url.($this->cur_page * $this->per_page).'">'.$this->next_link.'</a>'.$this->next_tag_close;

		}

		// Render the "Last" link

		if (($this->cur_page + $this->num_links) < $num_pages)

		{

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

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

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

		return $output;

	}

}

// END Pagination Class

/* End of file Pagination.php */

/* Location: ./system/libraries/Pagination.php */