<?php
class Zend_View_Helper_DiggPagination
{
	/**
	 * Builds & returns a variable containing the HTML code to display pagination links based on given params
	 *
	 * @param int $page - the current page
	 * @param int $totalitems - the number of items to paginate (not total number of pages)
	 * @param int $limit - the number of items per page
	 * @param int $adjacents - the number of page links to put adjacent to the current page
	 * @param string $targetpage - URL to the web page requiring pagination links e.g. /module/controller/action/id/abc123123/
	 * @param string $pagestring - the URL params to pass the new page value e.g. page/ (the number is inserted at the end of the string)
	 * @param string $cssClass - the class of the containing DIV tag for the returned pagination
	 * @return void
	 * @author Stranger Studios, adapted by Rich Milns
	 * @see http://www.strangerstudios.com/sandbox/pagination/diggstyle.php
	 */
	public function diggPagination($page = 1, $totalitems, $limit = 15, $adjacents = 1, $targetpage = "/", $pagestring = "page/", $cssClass='diggPagination')
	{		
		//defaults
		if(!$adjacents) $adjacents = 1;
		if(!$limit) $limit = 15;
		if(!$page) $page = 1;
		if(!$targetpage) $targetpage = "/";

		//other vars
		$prev = $page - 1;									//previous page is page - 1
		$next = $page + 1;									//next page is page + 1
		$lastpage = ceil($totalitems / $limit);				//lastpage is = total items / items per page, rounded up.
		$lpm1 = $lastpage - 1;								//last page minus 1

		/* 
			Now we apply our rules and draw the pagination object. 
			We're actually saving the code to a variable in case we want to draw it more than once.
		*/
		$pagination = "";
		if($lastpage > 1)
		{	
			$pagination .= "<div class=\"" . $cssClass . "\"";
			if($margin || $padding)
			{
				$pagination .= " style=\"";
				if($margin)
					$pagination .= "margin: $margin;";
				if($padding)
					$pagination .= "padding: $padding;";
				$pagination .= "\"";
			}
			$pagination .= ">";

			//previous button
			if ($page > 1) 
				$pagination .= "<a href=\"$targetpage$pagestring$prev\">« prev</a>";
			else
				$pagination .= "<span class=\"disabled\">« prev</span>";	

			//pages	
			if ($lastpage < 7 + ($adjacents * 2))	//not enough pages to bother breaking it up
			{	
				for ($counter = 1; $counter <= $lastpage; $counter++)
				{
					if ($counter == $page)
						$pagination .= "<span class=\"current\">$counter</span>";
					else
						$pagination .= "<a href=\"" . $targetpage . $pagestring . $counter . "\">$counter</a>";					
				}
			}
			elseif($lastpage >= 7 + ($adjacents * 2))	//enough pages to hide some
			{
				//close to beginning; only hide later pages
				if($page < 1 + ($adjacents * 3))		
				{
					for ($counter = 1; $counter < 4 + ($adjacents * 2); $counter++)
					{
						if ($counter == $page)
							$pagination .= "<span class=\"current\">$counter</span>";
						else
							$pagination .= "<a href=\"" . $targetpage . $pagestring . $counter . "\">$counter</a>";					
					}
					$pagination .= "<span class=\"elipses\">...</span>";
					$pagination .= "<a href=\"" . $targetpage . $pagestring . $lpm1 . "\">$lpm1</a>";
					$pagination .= "<a href=\"" . $targetpage . $pagestring . $lastpage . "\">$lastpage</a>";		
				}
				//in middle; hide some front and some back
				elseif($lastpage - ($adjacents * 2) > $page && $page > ($adjacents * 2))
				{
					$pagination .= "<a href=\"" . $targetpage . $pagestring . "1\">1</a>";
					$pagination .= "<a href=\"" . $targetpage . $pagestring . "2\">2</a>";
					$pagination .= "<span class=\"elipses\">...</span>";
					for ($counter = $page - $adjacents; $counter <= $page + $adjacents; $counter++)
					{
						if ($counter == $page)
							$pagination .= "<span class=\"current\">$counter</span>";
						else
							$pagination .= "<a href=\"" . $targetpage . $pagestring . $counter . "\">$counter</a>";					
					}
					$pagination .= "...";
					$pagination .= "<a href=\"" . $targetpage . $pagestring . $lpm1 . "\">$lpm1</a>";
					$pagination .= "<a href=\"" . $targetpage . $pagestring . $lastpage . "\">$lastpage</a>";		
				}
				//close to end; only hide early pages
				else
				{
					$pagination .= "<a href=\"" . $targetpage . $pagestring . "1\">1</a>";
					$pagination .= "<a href=\"" . $targetpage . $pagestring . "2\">2</a>";
					$pagination .= "<span class=\"elipses\">...</span>";
					for ($counter = $lastpage - (1 + ($adjacents * 3)); $counter <= $lastpage; $counter++)
					{
						if ($counter == $page)
							$pagination .= "<span class=\"current\">$counter</span>";
						else
							$pagination .= "<a href=\"" . $targetpage . $pagestring . $counter . "\">$counter</a>";					
					}
				}
			}

			//next button
			if ($page < $counter - 1) 
				$pagination .= "<a href=\"" . $targetpage . $pagestring . $next . "\">next »</a>";
			else
				$pagination .= "<span class=\"disabled\">next »</span>";
			$pagination .= "</div>\n";
		}

		return $pagination;

	}
}