<?php

namespace RoosterLMS\UI;

use RoosterLMS\Blocks\PortalData;
use RoosterLMS\Content\ObjectType;
use RoosterLMS\Data\Db;
use RoosterLMS\Domain\Services;
use RoosterLMS\I18n\Format;

defined( 'ABSPATH' ) || exit;

final class AccessMatrix {

	public const MAX_COURSES = 2000;

	public const SIZES = array( 25, 50, 100, 250, 0 );

	public const DEFAULT_SIZE = 50;

	public const ALL_LIMIT = 500;

	public const COOKIE = 'rooster_lms_matrix_pp';

	private static int $count = 0;

	public static function load( int $template_id, array $roles, array $course_ids, string $lang, ?array $cats = null ): array {
		$course_ids = array_values( array_unique( array_filter( array_map( 'intval', $course_ids ), static fn( int $id ): bool => $id > 0 ) ) );
		sort( $course_ids );
		$total      = count( $course_ids );
		$course_ids = array_slice( $course_ids, 0, self::MAX_COURSES );
		$out        = array(
			'roles'   => $roles,
			'courses' => array(),
			'rules'   => array(),
			'total'   => $total,
		);
		if ( array() === $course_ids ) {
			return $out;
		}
		$items = self::items( $course_ids );
		$units = array();
		foreach ( $items as $list ) {
			foreach ( $list as $item ) {
				$units[] = $item[1];
			}
		}
		$titles  = Services::posts()->titles( ObjectType::COURSE, $course_ids, $lang );
		$lessons = array() === $units ? array() : Services::posts()->titles( ObjectType::UNIT, array_values( array_unique( $units ) ), $lang );
		$cats    = $cats ?? PortalData::matrix_categories( $course_ids, $lang );
		$rank    = array_flip( array_keys( $cats['categories'] ) );
		$rows    = array();
		foreach ( $course_ids as $course_id ) {
			$path = $cats['paths'][ $course_id ] ?? array(
				'top' => 0,
				'sub' => 0,
			);
			$list = array();
			foreach ( $items[ $course_id ] ?? array() as $item ) {
				$list[] = array( $item[0], (string) ( $lessons[ $item[1] ]['title'] ?? '' ) );
			}
			$rows[] = array(
				'id'      => $course_id,
				'title'   => (string) ( $titles[ $course_id ]['title'] ?? '' ),
				'top'     => $path['top'] > 0 ? (string) ( $cats['categories'][ $path['top'] ]['name'] ?? '' ) : '',
				'sub'     => $path['sub'] > 0 ? (string) ( $cats['categories'][ $path['sub'] ]['name'] ?? '' ) : '',
				'lessons' => $list,
				'sort'    => array( $path['top'] > 0 ? ( $rank[ $path['top'] ] ?? PHP_INT_MAX ) : PHP_INT_MAX, $path['sub'] > 0 ? ( $rank[ $path['sub'] ] ?? PHP_INT_MAX ) : -1 ),
			);
		}
		usort(
			$rows,
			static function ( array $a, array $b ): int {
				$by = $a['sort'] <=> $b['sort'];
				if ( 0 === $by ) {
					$by = strcasecmp( remove_accents( $a['title'] ), remove_accents( $b['title'] ) );
				}
				return 0 === $by ? $a['id'] <=> $b['id'] : $by;
			}
		);
		foreach ( $rows as $row ) {
			unset( $row['sort'] );
			$out['courses'][] = $row;
		}
		$out['rules'] = self::rules( $template_id, $course_ids, array_keys( $roles ) );
		return $out;
	}

	private static function items( array $course_ids ): array {
		$out  = array();
		$rows = Db::rows(

				'SELECT i.id, i.course_id, i.unit_id FROM %i i
				JOIN %i u ON u.id = i.unit_id AND u.state = 1
				LEFT JOIN %i s ON s.id = i.section_id
				WHERE i.course_id IN (' . implode( ',', array_fill( 0, count( $course_ids ), '%d' ) ) . ') AND i.state = 1
				ORDER BY i.course_id, CASE WHEN i.section_id IS NULL THEN 0 ELSE 1 END, s.position, s.id, i.position, i.id',
				array_merge( array( Db::table( 'items' ), Db::table( 'units' ), Db::table( 'sections' ) ), $course_ids )

		);
		foreach ( $rows as $row ) {
			$out[ (int) $row['course_id'] ][] = array( (int) $row['id'], (int) $row['unit_id'] );
		}
		return $out;
	}

	private static function rules( int $template_id, array $course_ids, array $role_ids ): array {
		if ( $template_id <= 0 || array() === $role_ids ) {
			return array();
		}
		$courses = array_flip( $course_ids );
		$roles   = array_flip( array_map( 'intval', $role_ids ) );
		$out     = array();
		foreach ( Db::rows( 'SELECT job_role_id, course_id, item_id FROM %i WHERE template_id = %d ORDER BY job_role_id, course_id, item_id', Db::table( 'access_rules' ), $template_id ) as $row ) {
			if ( isset( $courses[ (int) $row['course_id'] ], $roles[ (int) $row['job_role_id'] ] ) ) {
				$out[ (int) $row['job_role_id'] . ':' . (int) $row['course_id'] . ':' . (int) $row['item_id'] ] = true;
			}
		}
		return $out;
	}

	public static function per_page( int $courses ): int {
		$raw  = isset( $_COOKIE[ self::COOKIE ] ) ? sanitize_key( wp_unslash( (string) $_COOKIE[ self::COOKIE ] ) ) : '';
		$size = '' === $raw || ! ctype_digit( $raw ) ? self::DEFAULT_SIZE : (int) $raw;
		if ( ! in_array( $size, self::SIZES, true ) || ( 0 === $size && $courses > self::ALL_LIMIT ) ) {
			$size = self::DEFAULT_SIZE;
		}
		return $size;
	}

	public static function render( array $data, array $args ): string {
		Assets::enqueue_matrix();
		$id      = 'rooster-lms-matrix-' . ( ++self::$count );
		$roles   = $data['roles'];
		$rules   = $data['rules'];
		$courses = $data['courses'];
		$n       = count( $courses );
		$size    = self::per_page( $n );
		$sizes   = array_values( array_filter( self::SIZES, static fn( int $s ): bool => 0 !== $s || $n <= self::ALL_LIMIT ) );
		$open    = array();
		$json    = array();
		foreach ( $courses as $course ) {
			$json[] = array( $course['id'], $course['title'], $course['top'], $course['sub'], $course['lessons'] );
			if ( count( $course['lessons'] ) > 1 && self::has_lesson_rules( $course['id'], $rules ) ) {
				$open[ $course['id'] ] = true;
			}
		}
		$data_attr = array(
			'courses' => $json,
			'rules'   => array_keys( $rules ),
			'open'    => array_keys( $open ),
			'perPage' => $size,
			'sizes'   => $sizes,
		);

		$html  = '<div class="rooster-lms-matrix" id="' . esc_attr( $id ) . '" data-rl-matrix' . ( ! empty( $args['post'] ) ? ' data-rl-matrix-post' : '' )
			. ' data-rl-matrix-data="' . esc_attr( (string) wp_json_encode( $data_attr ) ) . '"'
			. ' data-rl-matrix-l10n="' . esc_attr( (string) wp_json_encode( self::l10n() ) ) . '">';
		$html .= self::legend();
		if ( $data['total'] > $n ) {
			/* translators: 1: courses shown, 2: courses in all. */
			$cut   = sprintf( __( 'The grid shows the first %1$s of %2$s courses.', 'rooster-lms' ), Format::number( $n ), Format::number( $data['total'] ) );
			$html .= Ui::kit_markup() ? Ui::notice( $cut, 'warning' ) : '<p class="rooster-lms-notice rooster-lms-notice--warning">' . esc_html( $cut ) . '</p>';
		}
		$html .= '<div class="rooster-lms-matrix__card">';
		$html .= self::toolbar( $id, $n );
		$html .= '<div class="rooster-lms-matrix__scroll">';
		$html .= '<table class="rooster-lms-matrix__table" data-ra-legacy-table="the access matrix: courses and lessons by job role on the tree"><caption class="screen-reader-text">' . esc_html( $args['caption'] ?? __( 'Access matrix: courses and lessons by job role', 'rooster-lms' ) ) . '</caption>';
		$html .= self::head( $roles ) . '<tbody>';
		$last  = array( null, null );
		foreach ( 0 === $size ? $courses : array_slice( $courses, 0, $size ) as $course ) {
			$repeat = array( $course['top'] === $last[0], $course['top'] === $last[0] && $course['sub'] === $last[1] );
			$last   = array( $course['top'], $course['sub'] );
			$html  .= self::course_row( $course, $roles, $rules, $repeat, isset( $open[ $course['id'] ] ) );
		}
		$html .= '</tbody></table>';
		$html .= '<p class="rooster-lms-matrix__empty" data-rl-matrix-empty' . ( 0 === $n ? '' : ' hidden' ) . '>' . esc_html( 0 === $n ? __( 'There are no courses.', 'rooster-lms' ) : __( 'No course matches the search.', 'rooster-lms' ) ) . '</p></div>';
		$html .= self::footer( $id, $n, $size, $sizes );
		$html .= '</div>';
		$html .= '<noscript><p class="rooster-lms-notice rooster-lms-notice--warning">' . esc_html__( 'The access matrix needs JavaScript to save changes.', 'rooster-lms' ) . '</p></noscript>';
		$html .= '<div class="rooster-lms-matrix__savebar" data-rl-matrix-savebar hidden>'
			. '<span class="rooster-lms-matrix__dirty" data-rl-matrix-dirty>' . esc_html__( 'No unsaved changes', 'rooster-lms' ) . '</span>'
			. '<span class="rooster-lms-matrix__actions"><button type="button" class="rooster-lms-button rooster-lms-button--outline" data-rl-matrix-discard>' . esc_html__( 'Discard', 'rooster-lms' ) . '</button>'
			. $args['save'] . '</span></div>';
		$html .= '<p class="screen-reader-text" data-rl-matrix-live role="status" aria-live="polite"></p>';
		$html .= '<div class="rooster-lms-matrix__toast" data-rl-matrix-toast role="status" aria-live="polite" hidden></div>';
		return $html . '</div>';
	}

	private static function has_lesson_rules( int $course_id, array $rules ): bool {
		foreach ( array_keys( $rules ) as $key ) {
			$parts = explode( ':', $key );
			if ( (int) $parts[1] === $course_id && '0' !== $parts[2] ) {
				return true;
			}
		}
		return false;
	}

	private static function lessons_badge( int $total ): string {
		/* translators: %s: number of lessons. */
		$text = sprintf( _n( '%s lesson', '%s lessons', $total, 'rooster-lms' ), Format::number( $total ) );
		return Ui::kit_markup() ? Ui::badge( $text, 'secondary sm' ) : '<span class="rooster-lms-badge rooster-lms-badge--sm">' . esc_html( $text ) . '</span>';
	}

	public static function l10n(): array {
		return array(
			'all'         => __( 'Whole course', 'rooster-lms' ),
			/* translators: 1: lessons ticked, 2: lessons of the course. */
			'some'        => __( 'Only the ticked lessons (%1$d of %2$d)', 'rooster-lms' ),
			'none'        => __( 'Not assigned', 'rooster-lms' ),
			/* translators: %d: number of unsaved changes (always 1). */
			'dirtyOne'    => _n( '%d unsaved change', '%d unsaved changes', 1, 'rooster-lms' ),
			/* translators: %d: number of unsaved changes. */
			'dirtyMany'   => _n( '%d unsaved change', '%d unsaved changes', 2, 'rooster-lms' ),
			/* translators: %s: number of courses. */
			'countOne'    => _n( '%s course', '%s courses', 1, 'rooster-lms' ),
			/* translators: %s: number of courses. */
			'countMany'   => _n( '%s course', '%s courses', 2, 'rooster-lms' ),
			/* translators: 1: courses found, 2: courses of the grid. */
			'countSome'   => __( '%1$s of %2$s courses', 'rooster-lms' ),
			/* translators: %s: number of lessons. */
			'lessons'     => _n( '%s lesson', '%s lessons', 2, 'rooster-lms' ),
			/* translators: %s: course title. */
			'lessonsOf'   => __( 'Lessons of %s', 'rooster-lms' ),
			/* translators: 1: job role, 2: course title. */
			'courseLabel' => __( '%1$s: whole course %2$s', 'rooster-lms' ),
			/* translators: 1: job role, 2: lesson title. */
			'lessonLabel' => __( '%1$s: lesson %2$s', 'rooster-lms' ),
			/* translators: 1: first row, 2: last row, 3: rows in all. */
			'showing'     => __( 'Showing %1$s–%2$s of %3$s', 'rooster-lms' ),
			'first'       => __( 'First page', 'rooster-lms' ),
			'previous'    => __( 'Previous page', 'rooster-lms' ),
			'next'        => __( 'Next page', 'rooster-lms' ),
			'last'        => __( 'Last page', 'rooster-lms' ),
			/* translators: %s: page number. */
			'page'        => __( 'Page %s', 'rooster-lms' ),
			'saved'       => __( 'Access matrix saved.', 'rooster-lms' ),
			'discarded'   => __( 'Changes discarded.', 'rooster-lms' ),
		);
	}

	private static function state_text( string $state, int $count, int $total ): string {
		if ( 'all' === $state ) {
			return __( 'Whole course', 'rooster-lms' );
		}
		if ( 'some' === $state ) {
			/* translators: 1: lessons ticked, 2: lessons of the course. */
			return sprintf( __( 'Only the ticked lessons (%1$d of %2$d)', 'rooster-lms' ), $count, $total );
		}
		return __( 'Not assigned', 'rooster-lms' );
	}

	private static function legend(): string {
		return '<ul class="rooster-lms-matrix__legend">'
			. '<li><span class="rooster-lms-matrix__key is-all" aria-hidden="true"></span>' . esc_html__( 'Course ticked: the job role gets the whole course.', 'rooster-lms' ) . '</li>'
			. '<li><span class="rooster-lms-matrix__key is-some" aria-hidden="true"></span>' . esc_html__( 'Lessons ticked instead: only those lessons; the others are hidden and do not count towards completion.', 'rooster-lms' ) . '</li>'
			. '<li><span class="rooster-lms-matrix__key" aria-hidden="true"></span>' . esc_html__( 'Empty: not assigned.', 'rooster-lms' ) . '</li></ul>';
	}

	private static function toolbar( string $id, int $courses ): string {
		return '<div class="rooster-lms-matrix__toolbar">'
			. TreeTable::search_field( $id, 'rooster-lms-matrix', 'data-rl-matrix', __( 'Search courses', 'rooster-lms' ), __( 'Search courses, lessons, categories…', 'rooster-lms' ) )
			/* translators: %s: number of courses. */
			. '<span class="rooster-lms-matrix__count" data-rl-matrix-count>' . esc_html( sprintf( _n( '%s course', '%s courses', $courses, 'rooster-lms' ), Format::number( $courses ) ) ) . '</span>'
			. TreeTable::expand_tools( 'rooster-lms-matrix', 'data-rl-matrix' )
			. '</div>';
	}

	private static function head( array $roles ): string {
		$html = '<thead><tr>'
			. '<th scope="col" class="rooster-lms-matrix__cat">' . esc_html__( 'Top category', 'rooster-lms' ) . '</th>'
			. '<th scope="col" class="rooster-lms-matrix__sub">' . esc_html__( 'Sub-category', 'rooster-lms' ) . '</th>'
			. '<th scope="col" class="rooster-lms-matrix__course">' . esc_html__( 'Course', 'rooster-lms' ) . '</th>'
			. '<th scope="col" class="rooster-lms-matrix__lesson">' . esc_html__( 'Lesson', 'rooster-lms' ) . '</th>';
		foreach ( $roles as $role_id => $name ) {
			$html .= '<th scope="col" class="rooster-lms-matrix__role" data-role="' . esc_attr( (string) $role_id ) . '" data-name="' . esc_attr( $name ) . '">'
				. '<span class="rooster-lms-matrix__role-name" title="' . esc_attr( $name ) . '">' . esc_html( $name ) . '</span>'
				. '<span class="rooster-lms-matrix__col-tools">'
				/* translators: %s: job role. */
				. '<button type="button" data-rl-matrix-column="1" data-role="' . esc_attr( (string) $role_id ) . '" title="' . esc_attr( sprintf( __( 'Give %s every course of this page, whole', 'rooster-lms' ), $name ) ) . '">' . esc_html__( 'All', 'rooster-lms' ) . '</button>'
				/* translators: %s: job role. */
				. '<button type="button" data-rl-matrix-column="0" data-role="' . esc_attr( (string) $role_id ) . '" title="' . esc_attr( sprintf( __( 'Take every course of this page away from %s', 'rooster-lms' ), $name ) ) . '">' . esc_html__( 'None', 'rooster-lms' ) . '</button>'
				. '</span></th>';
		}
		return $html . '</tr></thead>';
	}

	private static function clip( string $text ): string {
		return '' === $text ? '' : '<span class="rooster-lms-matrix__clip" title="' . esc_attr( $text ) . '">' . esc_html( $text ) . '</span>';
	}

	private static function course_row( array $course, array $roles, array $rules, array $repeat, bool $open ): string {
		$id     = $course['id'];
		$total  = count( $course['lessons'] );
		$ticked = array();
		foreach ( array_keys( $rules ) as $key ) {
			$parts = array_map( 'intval', explode( ':', $key ) );
			if ( $parts[1] === $id && $parts[2] > 0 ) {
				$ticked[ $parts[0] ] = ( $ticked[ $parts[0] ] ?? 0 ) + 1;
			}
		}
		$html = '<tr class="rooster-lms-matrix__row is-course' . ( $open ? ' is-open' : '' ) . '" data-course="' . esc_attr( (string) $id ) . '" data-item="0">'
			. '<td class="rooster-lms-matrix__cat' . ( $repeat[0] ? ' is-repeat' : '' ) . '">' . self::clip( $course['top'] ) . '</td>'
			. '<td class="rooster-lms-matrix__sub' . ( $repeat[1] ? ' is-repeat' : '' ) . '">' . self::clip( $course['sub'] ) . '</td>'
			. '<th scope="row" class="rooster-lms-matrix__course">' . esc_html( $course['title'] ) . '</th><td class="rooster-lms-matrix__lesson">';
		if ( $total > 1 ) {
			$html .= '<button type="button" class="rooster-lms-matrix__toggle" data-rl-matrix-toggle aria-expanded="' . ( $open ? 'true' : 'false' ) . '"'
				/* translators: %s: course title. */
				. ' aria-label="' . esc_attr( sprintf( __( 'Lessons of %s', 'rooster-lms' ), $course['title'] ) ) . '">'
				. TreeTable::chevron( 'rooster-lms-matrix__chevron' )
				. self::lessons_badge( $total ) . '</button>';
		}
		$html .= '</td>';
		foreach ( $roles as $role_id => $role_name ) {
			$key   = $role_id . ':' . $id . ':0';
			$on    = isset( $rules[ $key ] );
			$count = $ticked[ $role_id ] ?? 0;
			$state = $on ? 'all' : ( $count > 0 ? 'some' : 'none' );
			$html .= '<td class="rooster-lms-matrix__cell"><input type="checkbox" class="rooster-lms-matrix__box" data-rule="' . esc_attr( $key ) . '" data-initial="' . ( $on ? '1' : '0' ) . '" data-state="' . esc_attr( $state ) . '"' . checked( $on, true, false )
				. ' title="' . esc_attr( self::state_text( $state, $count, $total ) ) . '"'
				/* translators: 1: job role, 2: course title. */
				. ' aria-label="' . esc_attr( sprintf( __( '%1$s: whole course %2$s', 'rooster-lms' ), $role_name, $course['title'] ) ) . '"></td>';
		}
		$html .= '</tr>';
		if ( $open ) {
			foreach ( $course['lessons'] as $lesson ) {
				$html .= self::lesson_row( $course, $lesson, $roles, $rules );
			}
		}
		return $html;
	}

	private static function lesson_row( array $course, array $lesson, array $roles, array $rules ): string {
		$html = '<tr class="rooster-lms-matrix__row is-item" data-course="' . esc_attr( (string) $course['id'] ) . '" data-item="' . esc_attr( (string) $lesson[0] ) . '">'
			. '<td class="rooster-lms-matrix__cat is-repeat">' . self::clip( $course['top'] ) . '</td>'
			. '<td class="rooster-lms-matrix__sub is-repeat">' . self::clip( $course['sub'] ) . '</td>'
			. '<td class="rooster-lms-matrix__course is-repeat">' . self::clip( $course['title'] ) . '</td>'
			. '<th scope="row" class="rooster-lms-matrix__lesson">' . esc_html( $lesson[1] ) . '</th>';
		foreach ( $roles as $role_id => $role_name ) {
			$key   = $role_id . ':' . $course['id'] . ':' . $lesson[0];
			$on    = isset( $rules[ $key ] );
			$whole = isset( $rules[ $role_id . ':' . $course['id'] . ':0' ] );
			$html .= '<td class="rooster-lms-matrix__cell"><input type="checkbox" class="rooster-lms-matrix__box rooster-lms-matrix__box--lesson" data-rule="' . esc_attr( $key ) . '" data-initial="' . ( $on ? '1' : '0' ) . '"' . checked( $on || $whole, true, false )
				/* translators: 1: job role, 2: lesson title. */
				. ' aria-label="' . esc_attr( sprintf( __( '%1$s: lesson %2$s', 'rooster-lms' ), $role_name, $lesson[1] ) ) . '"></td>';
		}
		return $html . '</tr>';
	}

	private static function footer( string $id, int $n, int $size, array $sizes ): string {
		$pages   = 0 === $size ? 1 : max( 1, (int) ceil( $n / $size ) );
		$to      = 0 === $size ? $n : min( $n, $size );
		$options = '';
		foreach ( $sizes as $s ) {
			$options .= '<option value="' . (int) $s . '"' . selected( $size, $s, false ) . '>' . esc_html( 0 === $s ? __( 'All', 'rooster-lms' ) : Format::number( $s ) ) . '</option>';
		}
		return '<div class="rooster-lms-matrix__footer">'
			/* translators: 1: first row, 2: last row, 3: rows in all. */
			. '<p class="rooster-lms-matrix__summary" data-rl-matrix-summary>' . esc_html( $n > 0 ? sprintf( __( 'Showing %1$s–%2$s of %3$s', 'rooster-lms' ), Format::number( 1 ), Format::number( $to ), Format::number( $n ) ) : '' ) . '</p>'
			. '<p class="rooster-lms-matrix__per-page"><label for="' . esc_attr( $id ) . '-pp">' . esc_html__( 'Rows per page', 'rooster-lms' ) . '</label>'
			. '<select class="' . esc_attr( Ui::select_class() ) . '" id="' . esc_attr( $id ) . '-pp" data-rl-matrix-per-page>' . $options . '</select></p>'
			. '<nav class="rooster-lms-table__pager rooster-lms-matrix__pager" aria-label="' . esc_attr__( 'Pages', 'rooster-lms' ) . '" data-rl-matrix-pager>' . self::pager( 1, $pages ) . '</nav>'
			. '</div>';
	}

	public static function pager( int $page, int $pages ): string {
		if ( $pages <= 1 ) {
			return '';
		}
		$step  = static function ( string $glyph, string $label, int $target, bool $on ): string {
			return $on
				? '<li><button type="button" class="rooster-lms-table__page" data-rl-matrix-page="' . $target . '" aria-label="' . esc_attr( $label ) . '">' . esc_html( $glyph ) . '</button></li>'
				: '<li><span class="rooster-lms-table__page" aria-disabled="true" aria-label="' . esc_attr( $label ) . '">' . esc_html( $glyph ) . '</span></li>';
		};
		$items = $step( '«', __( 'First page', 'rooster-lms' ), 1, $page > 1 ) . $step( '‹', __( 'Previous page', 'rooster-lms' ), $page - 1, $page > 1 );
		$shown = array_values( array_unique( array_filter( array( 1, $page - 1, $page, $page + 1, $pages ), static fn( int $p ): bool => $p >= 1 && $p <= $pages ) ) );
		sort( $shown );
		$last = 0;
		foreach ( $shown as $p ) {
			if ( $p - $last > 1 ) {
				$items .= '<li><span class="rooster-lms-table__page rooster-lms-table__page--gap" aria-hidden="true">…</span></li>';
			}
			/* translators: %s: page number. */
			$items .= '<li><button type="button" class="rooster-lms-table__page" data-rl-matrix-page="' . $p . '"' . ( $p === $page ? ' aria-current="page"' : '' ) . ' aria-label="' . esc_attr( sprintf( __( 'Page %s', 'rooster-lms' ), Format::number( $p ) ) ) . '">' . esc_html( Format::number( $p ) ) . '</button></li>';
			$last   = $p;
		}
		$items .= $step( '›', __( 'Next page', 'rooster-lms' ), $page + 1, $page < $pages ) . $step( '»', __( 'Last page', 'rooster-lms' ), $pages, $page < $pages );
		return '<ul>' . $items . '</ul>';
	}
}