From 759c848b86c1e4cc307f78b683a8411c2bf7ac39 Mon Sep 17 00:00:00 2001
From: Tim Lock <tim.lock@netspot.com.au>
Date: Thu, 12 Sep 2013 13:33:54 +0930
Subject: [PATCH 1/3] Added paging to reporting and taking attendance
 configable via module setting.

---
 export.php             |  1 +
 lang/en/attendance.php |  1 +
 locallib.php           | 31 +++++++++++++++++++--
 manage.php             |  1 +
 renderables.php        |  6 ++--
 renderer.php           | 62 ++++++++++++++++++++++++++++++++++++++++--
 report.php             |  2 ++
 settings.php           | 44 ++++++++++++++++++++++++++++++
 take.php               |  2 ++
 9 files changed, 143 insertions(+), 7 deletions(-)
 create mode 100644 settings.php

diff --git a/export.php b/export.php
index 57d7ebc..5d2d32f 100644
--- a/export.php
+++ b/export.php
@@ -55,6 +55,7 @@ if ($mform->is_submitted()) {
 
     $pageparams = new att_page_with_filter_controls();
     $pageparams->init($cm);
+    $pageparams->page = 0;
     $pageparams->group = $formdata->group;
     $pageparams->set_current_sesstype($formdata->group ? $formdata->group : att_page_with_filter_controls::SESSTYPE_ALL);
     if (isset($formdata->includeallsessions)) {
diff --git a/lang/en/attendance.php b/lang/en/attendance.php
index 5dd803c..9d4387a 100755
--- a/lang/en/attendance.php
+++ b/lang/en/attendance.php
@@ -130,6 +130,7 @@ The teacher can create multiple sessions and can mark the attendance status as "
 Reports are available for the entire class or individual students.';
 $string['modulenameplural'] = 'Attendances';
 $string['months'] = 'Months';
+$string['moreattendance'] = 'Attendance has been successfully taken for this page';
 $string['myvariables'] = 'My Variables';
 $string['newdate'] = 'New date';
 $string['newduration'] = 'New duration';
diff --git a/locallib.php b/locallib.php
index 1975b0b..a772da0 100644
--- a/locallib.php
+++ b/locallib.php
@@ -887,13 +887,33 @@ class attendance {
         $url = $this->url_take($params);
         add_to_log($this->course->id, 'attendance', 'taken', $url, '', $this->cm->id);
 
+        $group = 0;
+        if ($this->pageparams->grouptype != attendance::SESSION_COMMON) {
+            $group = $this->pageparams->grouptype;
+        } else {
+            if ($this->pageparams->group) {
+                $group = $this->pageparams->group;
+            }
+        }
+
+        $totalusers = count_enrolled_users(get_context_instance(CONTEXT_MODULE, $this->cm->id), 'mod/attendance:canbelisted', $group);
+        $usersperpage = $this->pageparams->perpage;
+
+        if (!empty($this->pageparams->page) && $this->pageparams->page && $totalusers && $usersperpage) {
+            $numberofpages = ceil($totalusers / $usersperpage);
+            if ($this->pageparams->page < $numberofpages) {
+                $params['page'] = $this->pageparams->page + 1;
+                redirect($this->url_take($params), get_string('moreattendance', 'attendance'));
+            }
+        }
+
         redirect($this->url_manage(), get_string('attendancesuccess', 'attendance'));
     }
 
     /**
      * MDL-27591 made this method obsolete.
      */
-    public function get_users($groupid = 0) {
+    public function get_users($groupid = 0, $page = 1) {
         global $DB;
 
         // Fields we need from the user table.
@@ -905,7 +925,14 @@ class attendance {
             $orderby = "u.lastname ASC, u.firstname ASC";
         }
 
-        $users = get_enrolled_users($this->context, 'mod/attendance:canbelisted', $groupid, $userfields, $orderby);
+        if ($page) {
+            $totalusers = count_enrolled_users($this->context, 'mod/attendance:canbelisted', $groupid);
+            $usersperpage = $this->pageparams->perpage;
+            $startusers = ($page - 1) * $usersperpage;
+            $users = get_enrolled_users($this->context, 'mod/attendance:canbelisted', $groupid, $userfields, $orderby, $startusers, $usersperpage);
+        } else {
+            $users = get_enrolled_users($this->context, 'mod/attendance:canbelisted', $groupid, $userfields, $orderby);
+        }
 
         // Add a flag to each user indicating whether their enrolment is active.
         if (!empty($users)) {
diff --git a/manage.php b/manage.php
index 03a394c..0099d5e 100644
--- a/manage.php
+++ b/manage.php
@@ -31,6 +31,7 @@ $id                         = required_param('id', PARAM_INT);
 $from                       = optional_param('from', null, PARAM_ALPHANUMEXT);
 $pageparams->view           = optional_param('view', null, PARAM_INT);
 $pageparams->curdate        = optional_param('curdate', null, PARAM_INT);
+$pageparams->perpage        = get_config('attendance', 'resultsperpage');
 
 $cm             = get_coursemodule_from_id('attendance', $id, 0, false, MUST_EXIST);
 $course         = $DB->get_record('course', array('id' => $cm->course), '*', MUST_EXIST);
diff --git a/renderables.php b/renderables.php
index 4234bcd..af38c0f 100644
--- a/renderables.php
+++ b/renderables.php
@@ -265,9 +265,9 @@ class attendance_take_data implements renderable {
 
     public function  __construct(attendance $att) {
         if ($att->pageparams->grouptype) {
-            $this->users = $att->get_users($att->pageparams->grouptype);
+            $this->users = $att->get_users($att->pageparams->grouptype, $att->pageparams->page);
         } else {
-            $this->users = $att->get_users($att->pageparams->group);
+            $this->users = $att->get_users($att->pageparams->group, $att->pageparams->page);
         }
 
         $this->pageparams = $att->pageparams;
@@ -458,7 +458,7 @@ class attendance_report_data implements renderable {
         $this->perm = $att->perm;
         $this->pageparams = $att->pageparams;
 
-        $this->users = $att->get_users($att->pageparams->group);
+        $this->users = $att->get_users($att->pageparams->group, $att->pageparams->page);
 
         $this->groups = groups_get_all_groups($att->course->id);
 
diff --git a/renderer.php b/renderer.php
index 2b7dae2..5192f2a 100644
--- a/renderer.php
+++ b/renderer.php
@@ -57,12 +57,14 @@ class mod_attendance_renderer extends plugin_renderer_base {
         $filtertable = new html_table();
         $filtertable->attributes['class'] = ' ';
         $filtertable->width = '100%';
-        $filtertable->align = array('left', 'center', 'right');
+        $filtertable->align = array('left', 'center', 'right', 'right');
 
         $filtertable->data[0][] = $this->render_sess_group_selector($fcontrols);
 
         $filtertable->data[0][] = $this->render_curdate_controls($fcontrols);
 
+        $filtertable->data[0][] = $this->render_paging_controls($fcontrols);
+
         $filtertable->data[0][] = $this->render_view_controls($fcontrols);
 
         $o = html_writer::table($filtertable);
@@ -91,6 +93,37 @@ class mod_attendance_renderer extends plugin_renderer_base {
         return '';
     }
 
+    protected function render_paging_controls(attendance_filter_controls $fcontrols) {
+        global $CFG;
+
+        $paging_controls = '';
+
+        $group = 0;
+        if (!empty($fcontrols->pageparams->group)) {
+            $group = $fcontrols->pageparams->group;
+        }
+
+        $totalusers = count_enrolled_users(get_context_instance(CONTEXT_MODULE, $fcontrols->cm->id), 'mod/attendance:canbelisted', $group);
+        $usersperpage = $fcontrols->pageparams->perpage;
+        if (empty($fcontrols->pageparams->page) || !$fcontrols->pageparams->page || !$totalusers || !$usersperpage) {
+            return $paging_controls;
+        }
+
+        $numberofpages = ceil($totalusers / $usersperpage);
+
+        if ($fcontrols->pageparams->page > 1) {
+            $paging_controls .= html_writer::link($fcontrols->url(array('curdate' => $fcontrols->nextcur, 'page' => $fcontrols->pageparams->page - 1)),
+                                                                         $this->output->larrow());
+        }
+        $paging_controls .= html_writer::tag('span', "Page {$fcontrols->pageparams->page} of $numberofpages", array('class' => 'attbtn'));
+        if ($fcontrols->pageparams->page < $numberofpages) {
+            $paging_controls .= html_writer::link($fcontrols->url(array('curdate' => $fcontrols->nextcur, 'page' => $fcontrols->pageparams->page + 1)),
+                                                                         $this->output->rarrow());
+        }
+
+        return $paging_controls ;
+    }
+
     protected function render_curdate_controls(attendance_filter_controls $fcontrols) {
         global $CFG;
 
@@ -280,7 +313,7 @@ class mod_attendance_renderer extends plugin_renderer_base {
         } else {
             $table = $this->render_attendance_take_grid($takedata);
         }
-        $table .= html_writer::input_hidden_params($takedata->url(array('sesskey' => sesskey())));
+        $table .= html_writer::input_hidden_params($takedata->url(array('sesskey' => sesskey(), 'page' => $takedata->pageparams->page)));
         $params = array(
                 'type'  => 'submit',
                 'value' => get_string('save', 'attendance'));
@@ -316,6 +349,31 @@ class mod_attendance_renderer extends plugin_renderer_base {
 
     private function construct_take_controls(attendance_take_data $takedata) {
         $controls = '';
+
+        $group = 0;
+        if ($takedata->pageparams->grouptype != attendance::SESSION_COMMON) {
+            $group = $takedata->pageparams->grouptype;
+        } else {
+            if ($takedata->pageparams->group) {
+                $group = $takedata->pageparams->group;
+            }
+        }
+
+        $totalusers = count_enrolled_users(get_context_instance(CONTEXT_MODULE, $takedata->cm->id), 'mod/attendance:canbelisted', $group);
+        $usersperpage = $takedata->pageparams->perpage;
+        if (!empty($takedata->pageparams->page) && $takedata->pageparams->page && $totalusers && $usersperpage) {
+            $controls .= html_writer::empty_tag('br');
+            $numberofpages = ceil($totalusers / $usersperpage);
+
+            if ($takedata->pageparams->page > 1) {
+                $controls .= html_writer::link($takedata->url(array('page' => $takedata->pageparams->page - 1)), $this->output->larrow());
+            }
+            $controls .= html_writer::tag('span', "Page {$takedata->pageparams->page} of $numberofpages", array('class' => 'attbtn'));
+            if ($takedata->pageparams->page < $numberofpages) {
+                $controls .= html_writer::link($takedata->url(array('page' => $takedata->pageparams->page + 1)), $this->output->rarrow());
+            }
+        }
+
         if ($takedata->pageparams->grouptype == attendance::SESSION_COMMON and
                 ($takedata->groupmode == VISIBLEGROUPS or
                 ($takedata->groupmode and $takedata->perm->can_access_all_groups()))) {
diff --git a/report.php b/report.php
index 032c4fd..8a4d4cf 100644
--- a/report.php
+++ b/report.php
@@ -33,6 +33,8 @@ $pageparams->view       = optional_param('view', null, PARAM_INT);
 $pageparams->curdate    = optional_param('curdate', null, PARAM_INT);
 $pageparams->group      = optional_param('group', null, PARAM_INT);
 $pageparams->sort       = optional_param('sort', null, PARAM_INT);
+$pageparams->page       = optional_param('page', 1, PARAM_INT);
+$pageparams->perpage    = get_config('attendance', 'resultsperpage');
 
 $cm             = get_coursemodule_from_id('attendance', $id, 0, false, MUST_EXIST);
 $course         = $DB->get_record('course', array('id' => $cm->course), '*', MUST_EXIST);
diff --git a/settings.php b/settings.php
new file mode 100644
index 0000000..66c5805
--- /dev/null
+++ b/settings.php
@@ -0,0 +1,44 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Attendance plugin settings
+ *
+ * @package    mod_attendance
+ * @copyright  2013 Netspot, Tim Lock.
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die;
+
+if ($ADMIN->fulltree) {
+    require_once(dirname(__FILE__).'/lib.php');
+
+    // Paging options.
+    $options = array(
+          0 => get_string('donotusepaging', 'attendance'),
+         25 => 25,
+         50 => 50,
+         75 => 75,
+         100 => 100,
+         250 => 250,
+         500 => 500,
+         1000 => 1000,
+    );
+
+    $settings->add(new admin_setting_configselect('attendance/resultsperpage',
+        get_string('resultsperpage', 'attendance'), get_string('resultsperpage_desc', 'attendance'), 25, $options));
+}
diff --git a/take.php b/take.php
index d7c7ac0..4452927 100644
--- a/take.php
+++ b/take.php
@@ -34,6 +34,8 @@ $pageparams->sort       = optional_param('sort', null, PARAM_INT);
 $pageparams->copyfrom   = optional_param('copyfrom', null, PARAM_INT);
 $pageparams->viewmode   = optional_param('viewmode', null, PARAM_INT);
 $pageparams->gridcols   = optional_param('gridcols', null, PARAM_INT);
+$pageparams->page       = optional_param('page', 1, PARAM_INT);
+$pageparams->perpage    = get_config('attendance', 'resultsperpage');
 
 $cm             = get_coursemodule_from_id('attendance', $id, 0, false, MUST_EXIST);
 $course         = $DB->get_record('course', array('id' => $cm->course), '*', MUST_EXIST);

From a10d92e882a41b211dd30b556b9f93c51aa281f5 Mon Sep 17 00:00:00 2001
From: Tim Lock <tim.lock@netspot.com.au>
Date: Thu, 12 Sep 2013 13:38:27 +0930
Subject: [PATCH 2/3] Add validation rule for session days if they are empty
 when creating multiple sessions

---
 add_form.php           | 6 ++++++
 lang/en/attendance.php | 1 +
 2 files changed, 7 insertions(+)

diff --git a/add_form.php b/add_form.php
index dabaeb1..51bffba 100644
--- a/add_form.php
+++ b/add_form.php
@@ -161,6 +161,12 @@ class mod_attendance_add_form extends moodleform {
         if ($data['sessiontype'] == attendance::SESSION_GROUP and empty($data['groups'])) {
             $errors['groups'] = get_string('errorgroupsnotselected', 'attendance');
         }
+
+        $addmulti = isset($data['addmultiply'])? (int)$data['addmultiply'] : 0;
+        if (($addmulti != 0) && (!array_key_exists('sdays',$data) || empty($data['sdays']))) {
+            $data['sdays']= array();
+            $errors['sdays'] = get_string('required', 'attendance');
+        }
         return $errors;
     }
 
diff --git a/lang/en/attendance.php b/lang/en/attendance.php
index 9d4387a..f79b88a 100755
--- a/lang/en/attendance.php
+++ b/lang/en/attendance.php
@@ -153,6 +153,7 @@ $string['pluginname'] = 'Attendance';
 $string['pluginadministration'] = 'Attendance administration';
 $string['remarks'] = 'Remarks';
 $string['report'] = 'Report';
+$string['required'] = 'Required*';
 $string['resetdescription'] = 'Remember that deleting attendance data will erase information from database. You can just hide older sessions having changed start date of course!';
 $string['resetstatuses'] = 'Reset statuses to default';
 $string['restoredefaults'] = 'Restore defaults';

From fb8f7ced16e1b61ef8829e0b2c489d1e3a48dbc6 Mon Sep 17 00:00:00 2001
From: Tim Lock <tim.lock@netspot.com.au>
Date: Thu, 12 Sep 2013 13:39:13 +0930
Subject: [PATCH 3/3] Add validation rule so session end date must be after
 session start date

---
 add_form.php           | 4 ++++
 lang/en/attendance.php | 1 +
 2 files changed, 5 insertions(+)

diff --git a/add_form.php b/add_form.php
index 51bffba..6cec532 100644
--- a/add_form.php
+++ b/add_form.php
@@ -158,6 +158,10 @@ class mod_attendance_add_form extends moodleform {
     public function validation($data, $files) {
         $errors = parent::validation($data, $files);
 
+        if ($data['sessiondate'] != 0 && $data['sessionenddate'] != 0 && $data['sessionenddate'] < $data['sessiondate']) {
+            $errors['sessionenddate'] = get_string('invalidsessionenddate', 'attendance');
+        }
+
         if ($data['sessiontype'] == attendance::SESSION_GROUP and empty($data['groups'])) {
             $errors['groups'] = get_string('errorgroupsnotselected', 'attendance');
         }
diff --git a/lang/en/attendance.php b/lang/en/attendance.php
index f79b88a..3ade055 100755
--- a/lang/en/attendance.php
+++ b/lang/en/attendance.php
@@ -121,6 +121,7 @@ $string['identifyby'] = 'Identify student by';
 $string['includeall'] = 'Select all sessions';
 $string['includenottaken'] = 'Include not taken sessions';
 $string['indetail'] = 'In detail...';
+$string['invalidsessionenddate'] = 'The session end date can not be earlier than the session start date';
 $string['jumpto'] = 'Jump to';
 $string['modulename'] = 'Attendance';
 $string['modulename_help'] = 'The attendance activity module enables a teacher to take attendance during class and students to view their own attendance record.