<?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/>.

/**
 * Participation report
 *
 * @package    report
 * @subpackage participation
 * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require('../../config.php');
require_once($CFG->dirroot.'/lib/tablelib.php');

define('DEFAULT_PAGE_SIZE', 20);
define('SHOW_ALL_PAGE_SIZE', 5000);

$id         = required_param('id', PARAM_INT); // course id.
$roleid     = optional_param('roleid', 0, PARAM_INT); // which role to show
$instanceid = optional_param('instanceid', 0, PARAM_INT); // instance we're looking at.
$timefrom   = optional_param('timefrom', 0, PARAM_INT); // how far back to look...
$action     = optional_param('action', '', PARAM_ALPHA);
$page       = optional_param('page', 0, PARAM_INT);                     // which page to show
$perpage    = optional_param('perpage', DEFAULT_PAGE_SIZE, PARAM_INT);  // how many per page

$url = new moodle_url('/report/participation/index.php', array('id'=>$id));
if ($roleid !== 0) $url->param('roleid');
if ($instanceid !== 0) $url->param('instanceid');
if ($timefrom !== 0) $url->param('timefrom');
if ($action !== '') $url->param('action');
if ($page !== 0) $url->param('page');
if ($perpage !== DEFAULT_PAGE_SIZE) $url->param('perpage');
$PAGE->set_url($url);
$PAGE->set_pagelayout('admin');

if ($action != 'view' and $action != 'post') {
    $action = ''; // default to all (don't restrict)
}

if (!$course = $DB->get_record('course', array('id'=>$id))) {
    print_error('invalidcourse');
}

if ($roleid != 0 and !$role = $DB->get_record('role', array('id'=>$roleid))) {
    print_error('invalidrole');
}

require_login($course);
$context = get_context_instance(CONTEXT_COURSE, $course->id);
require_capability('report/participation:view', $context);

add_to_log($course->id, "course", "report participation", "report/participation/index.php?id=$course->id", $course->id);

$strparticipation = get_string('participationreport');
$strviews         = get_string('views');
$strposts         = get_string('posts');
$strview          = get_string('view');
$strpost          = get_string('post');
$strallactions    = get_string('allactions');
$strreports       = get_string('reports');

$actionoptions = array('' => $strallactions,
                       'view' => $strview,
                       'post' => $strpost,);
if (!array_key_exists($action, $actionoptions)) {
    $action = '';
}

$PAGE->set_title($course->shortname .': '. $strparticipation);
$PAGE->set_heading($course->fullname);
echo $OUTPUT->header();

$modinfo = get_fast_modinfo($course);

$modules = $DB->get_records_select('modules', "visible = 1", null, 'name ASC');

$instanceoptions = array();
foreach ($modules as $module) {
    if (empty($modinfo->instances[$module->name])) {
        continue;
    }
    $instances = array();
    foreach ($modinfo->instances[$module->name] as $cm) {
        // Skip modules such as label which do not actually have links;
        // this means there's nothing to participate in
        if (!$cm->has_view()) {
            continue;
        }
        $instances[$cm->id] = format_string($cm->name);
    }
    if (count($instances) == 0) {
        continue;
    }
    $instanceoptions[] = array(get_string('modulenameplural', $module->name)=>$instances);
}

$timeoptions = array();
// get minimum log time for this course
$minlog = $DB->get_field_sql('SELECT min(time) FROM {log} WHERE course = ?', array($course->id));

$now = usergetmidnight(time());

// days
for ($i = 1; $i < 7; $i++) {
    if (strtotime('-'.$i.' days',$now) >= $minlog) {
        $timeoptions[strtotime('-'.$i.' days',$now)] = get_string('numdays','moodle',$i);
    }
}
// weeks
for ($i = 1; $i < 10; $i++) {
    if (strtotime('-'.$i.' weeks',$now) >= $minlog) {
        $timeoptions[strtotime('-'.$i.' weeks',$now)] = get_string('numweeks','moodle',$i);
    }
}
// months
for ($i = 2; $i < 12; $i++) {
    if (strtotime('-'.$i.' months',$now) >= $minlog) {
        $timeoptions[strtotime('-'.$i.' months',$now)] = get_string('nummonths','moodle',$i);
    }
}
// try a year
if (strtotime('-1 year',$now) >= $minlog) {
    $timeoptions[strtotime('-1 year',$now)] = get_string('lastyear');
}

$roleoptions = array();
// TODO: we need a new list of roles that are visible here
if ($roles = get_roles_used_in_context($context)) {
    foreach ($roles as $r) {
        $roleoptions[$r->id] = $r->name;
    }
}
$guestrole = get_guest_role();
if (empty($roleoptions[$guestrole->id])) {
        $roleoptions[$guestrole->id] = $guestrole->name;
}

$roleoptions = role_fix_names($roleoptions, $context);

// print first controls.
echo '<form class="participationselectform" action="index.php" method="get"><div>'."\n".
     '<input type="hidden" name="id" value="'.$course->id.'" />'."\n";
echo '<label for="menuinstanceid">'.get_string('activitymodule').'</label>'."\n";
echo html_writer::select($instanceoptions, 'instanceid', $instanceid);
echo '<label for="menutimefrom">'.get_string('lookback').'</label>'."\n";
echo html_writer::select($timeoptions,'timefrom',$timefrom);
echo '<label for="menuroleid">'.get_string('showonly').'</label>'."\n";
echo html_writer::select($roleoptions,'roleid',$roleid,false);
echo '<label for="menuaction">'.get_string('showactions').'</label>'."\n";
echo html_writer::select($actionoptions,'action',$action,false);
echo '<input type="submit" value="'.get_string('go').'" />'."\n</div></form>\n";

$baseurl =  $CFG->wwwroot.'/report/participation/index.php?id='.$course->id.'&amp;roleid='
    .$roleid.'&amp;instanceid='.$instanceid.'&amp;timefrom='.$timefrom.'&amp;action='.$action.'&amp;perpage='.$perpage;

if (!empty($instanceid) && !empty($roleid)) {
    // from here assume we have at least the module we're using.
    $cm = $modinfo->cms[$instanceid];
    $modulename = get_string('modulename', $cm->modname);

    include_once($CFG->dirroot.'/mod/'.$cm->modname.'/lib.php');

    $viewfun = $cm->modname.'_get_view_actions';
    $postfun = $cm->modname.'_get_post_actions';

    if (!function_exists($viewfun) || !function_exists($postfun)) {
        print_error('modulemissingcode', 'error', $baseurl, $cm->modname);
    }

    $viewnames = $viewfun();
    $postnames = $postfun();

    $table = new flexible_table('course-participation-'.$course->id.'-'.$cm->id.'-'.$roleid);
    $table->course = $course;

    $table->define_columns(array('fullname','count','select'));
    $table->define_headers(array(get_string('user'),((!empty($action)) ? get_string($action) : get_string('allactions')),get_string('select')));
    $table->define_baseurl($baseurl);

    $table->set_attribute('cellpadding','5');
    $table->set_attribute('class', 'generaltable generalbox reporttable');

    $table->sortable(true,'lastname','ASC');
    $table->no_sorting('select');

    $table->set_control_variables(array(
                                        TABLE_VAR_SORT    => 'ssort',
                                        TABLE_VAR_HIDE    => 'shide',
                                        TABLE_VAR_SHOW    => 'sshow',
                                        TABLE_VAR_IFIRST  => 'sifirst',
                                        TABLE_VAR_ILAST   => 'silast',
                                        TABLE_VAR_PAGE    => 'spage'
                                        ));
    $table->setup();

    switch ($action) {
        case 'view':
            $actions = $viewnames;
            break;
        case 'post':
            $actions = $postnames;
            break;
        default:
            // some modules have stuff we want to hide, ie mail blocked etc so do actually need to limit here.
            $actions = array_merge($viewnames, $postnames);
    }

    list($actionsql, $params) = $DB->get_in_or_equal($actions, SQL_PARAMS_NAMED, 'action');
    $actionsql = "action $actionsql";

    $relatedcontexts = get_related_contexts_string($context);

    $sql = "SELECT ra.userid, u.firstname, u.lastname, u.idnumber, l.actioncount AS count
            FROM (SELECT * FROM {role_assignments} WHERE contextid $relatedcontexts AND roleid = :roleid ) ra
            JOIN {user} u ON u.id = ra.userid
            LEFT JOIN (
                SELECT userid, COUNT(action) AS actioncount FROM {log} WHERE cmid = :instanceid AND time > :timefrom AND $actionsql GROUP BY userid
            ) l ON (l.userid = ra.userid)";
    $params['roleid'] = $roleid;
    $params['instanceid'] = $instanceid;
    $params['timefrom'] = $timefrom;

    list($twhere, $tparams) = $table->get_sql_where();
    if ($twhere) {
        $sql .= ' WHERE '.$twhere; //initial bar
        $params = array_merge($params, $tparams);
    }

    if ($table->get_sql_sort()) {
        $sql .= ' ORDER BY '.$table->get_sql_sort();
    }

    $countsql = "SELECT COUNT(DISTINCT(ra.userid))
                   FROM {role_assignments} ra
                   JOIN {user} u ON u.id = ra.userid
                  WHERE ra.contextid $relatedcontexts AND ra.roleid = :roleid";

    $totalcount = $DB->count_records_sql($countsql, $params);

    if ($twhere) {
        $matchcount = $DB->count_records_sql($countsql.' AND '.$twhere, $params);
    } else {
        $matchcount = $totalcount;
    }

    echo '<div id="participationreport">' . "\n";
    echo '<p class="modulename">'.$modulename . ' ' . $strviews.': '.implode(', ',$viewnames).'<br />'."\n"
        . $modulename . ' ' . $strposts.': '.implode(', ',$postnames).'</p>'."\n";

    $table->initialbars($totalcount > $perpage);
    $table->pagesize($perpage, $matchcount);

    if (!$users = $DB->get_records_sql($sql, $params, $table->get_page_start(), $table->get_page_size())) {
        $users = array(); // tablelib will handle saying 'Nothing to display' for us.
    }

    $data = array();

    $a = new stdClass();
    $a->count = $totalcount;
    $a->items = $role->name;

    if ($matchcount != $totalcount) {
        $a->count = $matchcount.'/'.$a->count;
    }

    echo '<h2>'.get_string('counteditems', '', $a).'</h2>'."\n";

    echo '<form action="'.$CFG->wwwroot.'/user/action_redir.php" method="post" id="studentsform">'."\n";
    echo '<div>'."\n";
    echo '<input type="hidden" name="id" value="'.$id.'" />'."\n";
    echo '<input type="hidden" name="returnto" value="'. s($PAGE->url) .'" />'."\n";
    echo '<input type="hidden" name="sesskey" value="'.sesskey().'" />'."\n";

    foreach ($users as $u) {
        $data = array('<a href="'.$CFG->wwwroot.'/user/view.php?id='.$u->userid.'&amp;course='.$course->id.'">'.fullname($u,true).'</a>'."\n",
                      ((!empty($u->count)) ? get_string('yes').' ('.$u->count.') ' : get_string('no')),
                      '<input type="checkbox" class="usercheckbox" name="user'.$u->userid.'" value="'.$u->count.'" />'."\n",
                      );
        $table->add_data($data);
    }

    $table->print_html();

    if ($perpage == SHOW_ALL_PAGE_SIZE) {
        echo '<div id="showall"><a href="'.$baseurl.'&amp;perpage='.DEFAULT_PAGE_SIZE.'">'.get_string('showperpage', '', DEFAULT_PAGE_SIZE).'</a></div>'."\n";
    }
    else if ($matchcount > 0 && $perpage < $matchcount) {
        echo '<div id="showall"><a href="'.$baseurl.'&amp;perpage='.SHOW_ALL_PAGE_SIZE.'">'.get_string('showall', '', $matchcount).'</a></div>'."\n";
    }

    echo '<div class="selectbuttons">';
    echo '<input type="button" id="checkall" value="'.get_string('selectall').'" /> '."\n";
    echo '<input type="button" id="checknone" value="'.get_string('deselectall').'" /> '."\n";
    if ($perpage >= $matchcount) {
        echo '<input type="button" id="checknos" value="'.get_string('selectnos').'" />'."\n";
    }
    echo '</div>';
    echo '<div>';
    echo '<label for="formactionselect">'.get_string('withselectedusers').'</label>';
    $displaylist['messageselect.php'] = get_string('messageselectadd');
    echo html_writer::select($displaylist, 'formaction', '', array(''=>'choosedots'), array('id'=>'formactionselect'));
    echo $OUTPUT->help_icon('withselectedusers');
    echo '<input type="submit" value="' . get_string('ok') . '" />'."\n";
    echo '</div>';
    echo '</div>'."\n";
    echo '</form>'."\n";
    echo '</div>'."\n";

    $PAGE->requires->js_init_call('M.report_participation.init');
}

echo $OUTPUT->footer();


