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

/**
 * Kalkun
 * An open source web based SMS Manager
 *
 * @copyright 2022 Fab Stz
 * @author Fab Stz <fabstz-it@yahoo.fr>
 * @license <https://spdx.org/licenses/GPL-2.0-or-later.html> GPL-2.0-or-later
 * @link https://kalkun.sourceforge.io/
 */

class MY_Pagination extends CI_Pagination {

	public function create_links()
	{
		if (version_compare(PHP_VERSION, '8.1.0') >= 0 && version_compare(CI_VERSION, '3.1.13') <= 0)
		{
			return $this->create_links_for_php81();
		}
		return parent::create_links();
	}

	/**
	 * Generate the pagination links for PHP 8.1
	 *
	 * This is copied from CI_Pagination::create_links() of CI 3.1.13
	 * Except we updated the argument of ctype_digit() for PHP 8.1 compatibility
	 *
	 * @return	string
	 */
	private function create_links_for_php81()
	{
		// If our item count or per-page total is zero there is no need to continue.
		// Note: DO NOT change the operator to === here!
		if ($this->total_rows == 0 OR $this->per_page == 0)
		{
			return '';
		}

		// Calculate the total number of pages
		$num_pages = (int) ceil($this->total_rows / $this->per_page);

		// Is there only one page? Hm... nothing more to do here then.
		if ($num_pages === 1)
		{
			return '';
		}

		// Check the user defined number of links.
		$this->num_links = (int) $this->num_links;

		if ($this->num_links < 0)
		{
			show_error('Your number of links must be a non-negative number.');
		}

		// Keep any existing query string items.
		// Note: Has nothing to do with any other query string option.
		if ($this->reuse_query_string === TRUE)
		{
			$get = $this->CI->input->get();

			// Unset the control, method, old-school routing options
			unset($get['c'], $get['m'], $get[$this->query_string_segment]);
		}
		else
		{
			$get = array();
		}

		// Put together our base and first URLs.
		// Note: DO NOT append to the properties as that would break successive calls
		$base_url = trim($this->base_url);
		$first_url = $this->first_url;

		$query_string = '';
		$query_string_sep = (strpos($base_url, '?') === FALSE) ? '?' : '&amp;';

		// Are we using query strings?
		if ($this->page_query_string === TRUE)
		{
			// If a custom first_url hasn't been specified, we'll create one from
			// the base_url, but without the page item.
			if ($first_url === '')
			{
				$first_url = $base_url;

				// If we saved any GET items earlier, make sure they're appended.
				if ( ! empty($get))
				{
					$first_url .= $query_string_sep.http_build_query($get);
				}
			}

			// Add the page segment to the end of the query string, where the
			// page number will be appended.
			$base_url .= $query_string_sep.http_build_query(array_merge($get, array($this->query_string_segment => '')));
		}
		else
		{
			// Standard segment mode.
			// Generate our saved query string to append later after the page number.
			if ( ! empty($get))
			{
				$query_string = $query_string_sep.http_build_query($get);
				$this->suffix .= $query_string;
			}

			// Does the base_url have the query string in it?
			// If we're supposed to save it, remove it so we can append it later.
			if ($this->reuse_query_string === TRUE && ($base_query_pos = strpos($base_url, '?')) !== FALSE)
			{
				$base_url = substr($base_url, 0, $base_query_pos);
			}

			if ($first_url === '')
			{
				$first_url = $base_url.$query_string;
			}

			$base_url = rtrim($base_url, '/').'/';
		}

		// Determine the current page number.
		$base_page = ($this->use_page_numbers) ? 1 : 0;

		// Are we using query strings?
		if ($this->page_query_string === TRUE)
		{
			$this->cur_page = $this->CI->input->get($this->query_string_segment);
		}
		elseif (empty($this->cur_page))
		{
			// Default to the last segment number if one hasn't been defined.
			if ($this->uri_segment === 0)
			{
				$this->uri_segment = count($this->CI->uri->segment_array());
			}

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

			// Remove any specified prefix/suffix from the segment.
			if ($this->prefix !== '' OR $this->suffix !== '')
			{
				$this->cur_page = str_replace(array($this->prefix, $this->suffix), '', $this->cur_page);
			}
		}
		else
		{
			$this->cur_page = (string) $this->cur_page;
		}

		// If something isn't quite right, back to the default base page.
		if ( ! ctype_digit($this->cur_page ? $this->cur_page : '') OR ($this->use_page_numbers && (int) $this->cur_page === 0))
		{
			$this->cur_page = $base_page;
		}
		else
		{
			// Make sure we're using integers for comparisons later.
			$this->cur_page = (int) $this->cur_page;
		}

		// Is the page number beyond the result range?
		// If so, we show the last page.
		if ($this->use_page_numbers)
		{
			if ($this->cur_page > $num_pages)
			{
				$this->cur_page = $num_pages;
			}
		}
		elseif ($this->cur_page > $this->total_rows)
		{
			$this->cur_page = ($num_pages - 1) * $this->per_page;
		}

		$uri_page_number = $this->cur_page;

		// If we're using offset instead of page numbers, convert it
		// to a page number, so we can generate the surrounding number links.
		if ( ! $this->use_page_numbers)
		{
			$this->cur_page = (int) floor(($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;

		// And here we go...
		$output = '';

		// Render the "First" link.
		if ($this->first_link !== FALSE && $this->cur_page > ($this->num_links + 1 + ! $this->num_links))
		{
			// Take the general parameters, and squeeze this pagination-page attr in for JS frameworks.
			$attributes = sprintf('%s %s="%d"', $this->_attributes, $this->data_page_attr, 1);

			$output .= $this->first_tag_open.'<a href="'.$first_url.'"'.$attributes.$this->_attr_rel('start').'>'
				.$this->first_link.'</a>'.$this->first_tag_close;
		}

		// Render the "Previous" link.
		if ($this->prev_link !== FALSE && $this->cur_page !== 1)
		{
			$i = ($this->use_page_numbers) ? $uri_page_number - 1 : $uri_page_number - $this->per_page;

			$attributes = sprintf('%s %s="%d"', $this->_attributes, $this->data_page_attr, ($this->cur_page - 1));

			if ($i === $base_page)
			{
				// First page
				$output .= $this->prev_tag_open.'<a href="'.$first_url.'"'.$attributes.$this->_attr_rel('prev').'>'
					.$this->prev_link.'</a>'.$this->prev_tag_close;
			}
			else
			{
				$append = $this->prefix.$i.$this->suffix;
				$output .= $this->prev_tag_open.'<a href="'.$base_url.$append.'"'.$attributes.$this->_attr_rel('prev').'>'
					.$this->prev_link.'</a>'.$this->prev_tag_close;
			}
		}

		// Render the pages
		if ($this->display_pages !== FALSE)
		{
			// Write the digit links
			for ($loop = $start - 1; $loop <= $end; $loop++)
			{
				$i = ($this->use_page_numbers) ? $loop : ($loop * $this->per_page) - $this->per_page;

				$attributes = sprintf('%s %s="%d"', $this->_attributes, $this->data_page_attr, $loop);

				if ($i >= $base_page)
				{
					if ($this->cur_page === $loop)
					{
						// Current page
						$output .= $this->cur_tag_open.$loop.$this->cur_tag_close;
					}
					elseif ($i === $base_page)
					{
						// First page
						$output .= $this->num_tag_open.'<a href="'.$first_url.'"'.$attributes.$this->_attr_rel('start').'>'
							.$loop.'</a>'.$this->num_tag_close;
					}
					else
					{
						$append = $this->prefix.$i.$this->suffix;
						$output .= $this->num_tag_open.'<a href="'.$base_url.$append.'"'.$attributes.'>'
							.$loop.'</a>'.$this->num_tag_close;
					}
				}
			}
		}

		// Render the "next" link
		if ($this->next_link !== FALSE && $this->cur_page < $num_pages)
		{
			$i = ($this->use_page_numbers) ? $this->cur_page + 1 : $this->cur_page * $this->per_page;

			$attributes = sprintf('%s %s="%d"', $this->_attributes, $this->data_page_attr, $this->cur_page + 1);

			$output .= $this->next_tag_open.'<a href="'.$base_url.$this->prefix.$i.$this->suffix.'"'.$attributes
				.$this->_attr_rel('next').'>'.$this->next_link.'</a>'.$this->next_tag_close;
		}

		// Render the "Last" link
		if ($this->last_link !== FALSE && ($this->cur_page + $this->num_links + ! $this->num_links) < $num_pages)
		{
			$i = ($this->use_page_numbers) ? $num_pages : ($num_pages * $this->per_page) - $this->per_page;

			$attributes = sprintf('%s %s="%d"', $this->_attributes, $this->data_page_attr, $num_pages);

			$output .= $this->last_tag_open.'<a href="'.$base_url.$this->prefix.$i.$this->suffix.'"'.$attributes.'>'
				.$this->last_link.'</a>'.$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
		return $this->full_tag_open.$output.$this->full_tag_close;
	}
}