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

include_once(BASEPATH.'libraries/Pagination.php');

class PaginationSortable extends CI_Pagination {
    /**
     * Generate the pagination links
     *
     * @access	public
     * @return	string
     */
    function create_links($extrauri=null)
    {
        if (isset($extrauri)){
            $extrauri = "/" . $extrauri;
        } else {
            $extrauri = "";
        }

        // 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."0".$extrauri.'">'.$this->first_link.'</a>'.$this->first_tag_close;
        }

        // Render the "previous" link
        if  ($this->cur_page != 1)
        {
            $i = $uri_page_number - $this->per_page;
            $output .= $this->prev_tag_open.'<a href="'.$this->base_url.$i.$extrauri.'">'.$this->prev_link.'</a>'.$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
                {
                    $output .= $this->num_tag_open.'<a href="'.$this->base_url.$i.$extrauri.'">'.$loop.'</a>'.$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 * $this->per_page).$extrauri.'">'.$this->next_link.'</a>'.$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.$i.$extrauri.'">'.$this->last_link.'</a>'.$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;
    }
}

?>