<?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;

    }
}