<?php
/*=====================================================================*\
|| ###################################################################
|| # Bugdar [#]version[#]
|| # Copyright Š2002-[#]year[#] Blue Static
|| #
|| # 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; version [#]gpl[#] of the License.
|| #
|| # 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.
|| #
|| # You should have received a copy of the GNU General Public License along
|| # with this program; if not, write to the Free Software Foundation, Inc.,
|| # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
|| ###################################################################
\*=====================================================================*/

/**
* Class that is responsible for paginating data. Takes passed
* parameters and creates pagination links.
*/
class Pagination
{
	/**
	* Current page number
	* @var	integer
	*/
	var $page;
	
	/**
	* Per-page value
	* @var	integer
	*/
	var $perpage;
	
	/**
	* Number of page links
	* @var	integer
	*/
	var $pagelinks;
	
	/**
	* Total number of results
	* @var	integer
	*/
	var $total;
	
	/**
	* Total number of pages
	* @var	integer
	*/
	var $pagecount;
	
	/**
	* Variable names
	* @var	array
	*/
	var $vars;
	
	/**
	* Constructor: sanitize incoming variables
	*
	* @param	string	Name of page number variable
	* @param	string	Name of per-page variable
	*/
	function Pagination($page, $perpage)
	{
		global $bugsys;
		
		$this->page = intval($bugsys->in["$page"]);
		$this->perpage = intval($bugsys->in["$perpage"]);
		$this->pagelinks = intval($bugsys->options['pagelinks']);
		
		$this->vars = array('p' => $page, 'pp' => $perpage);
		
		if ($this->page <= 0)
		{
			$this->page = 1;
		}
		
		if ($this->perpage <= 0)
		{
			$this->perpage = $bugsys->options['defaultpp'];
		}
		if ($this->perpage > $bugsys->options['maxpp'])
		{
			$this->perpage = $bugsys->options['maxpp'];
		}
		
		$this->perpage = intval($this->perpage);
	}
	
	/**
	* Takes the variables and splits up the pages
	*
	* @access	protected
	*/
	function split_pages()
	{
		$this->pagecount = ceil($this->total / $this->perpage);
		if ($this->pagelinks == 0)
		{
			$this->pagelinks = $this->pagecount;
		}
	}
	
	/**
	* Returns the lower limit of the pages
	*
	* @access	public
	*
	* @param	integer	Page number
	*
	* @return	integer	Lower result limit
	*/
	function fetch_limit($page = null)
	{
		if ($page === null)
		{
			$page = $this->page;
		}
		
		$limit = $page * $this->perpage;
		
		if ($page < 1)
		{
			$page = 1;
			$limit = 0;
		}
		else if ($page > $this->pagecount)
		{
			$page = $this->pagecount - 1;
			$limit = $this->total;
		}
		
		if ($limit < 0)
		{
			return 0;
		}
		else if ($limit > $this->total)
		{
			return $this->total;
		}
		else
		{
			return $limit;
		}
	}
	
	/**
	* Constructs the page navigator
	*
	* @access	public
	*
	* @param	string	Base link path
	*
	* @return	string	Generated HTML page navigator
	*/
	function construct_page_nav($baselink)
	{
		global $bugsys;
		
		// handle base link
		if (strpos($baselink, '?') === false)
		{
			$baselink .= '?';
		}
		else if (!preg_match('#\?$#', $baselink) AND !preg_match('#(&|&amp;)$#', $baselink))
		{
			$baselink .= '&amp;';
		}
		
		// first page number in page nav
		$startpage = $this->page - $this->pagelinks;
		if ($startpage < 1)
		{
			$startpage = 1;
		}
		
		// last page number in page nav
		$endpage = $this->page + $this->pagelinks;
		if ($endpage > $this->pagecount)
		{
			$endpage = $this->pagecount;
		}
		
		// prev page in page nav
		$prevpage = $this->page - 1;
		if ($prevpage < 1)
		{
			$prevpage = 1;
		}
		
		// next page in page nav
		$nextpage = $this->page + 1;
		if ($nextpage > $this->pagecount)
		{
			$nextpage = $this->pagecount;
		}
		
		// show the prev page
		$show['prev'] = true;
		if ($this->page == $startpage)
		{
			$show['prev'] = false;
		}
		
		// show the next page
		$show['next'] = true;
		if ($this->page == $endpage)
		{
			$show['next'] = false;
		}
		
		// show the first page
		$show['first'] = false;
		if ($startpage > 1)
		{
			$show['first'] = true;
		}
		
		// show the last page
		$show['last'] = false;
		if ($endpage < $this->pagecount)
		{
			$show['last'] = true;
		}
		
		// construct the page bits
		$pagebits = array();
		for ($i = $startpage; $i <= $endpage; $i++)
		{
			if ($i == $this->page)
			{
				$nolink = true;
			}
			else
			{
				$nolink = false;
			}
			eval('$pagebits[] .= "' . $bugsys->template->fetch('pagenav_bit') . '";');
		}
		
		$pagebits = implode(",\n", $pagebits);
		
		eval('$pagenav = "' . $bugsys->template->fetch('pagenav') . '";');
		
		return $pagenav;
	}
}

/*=====================================================================*\
|| ###################################################################
|| # $HeadURL$
|| # $Id$
|| ###################################################################
\*=====================================================================*/
?>