/**
  * Initialise the iterator
  * @return boolean success
  */
 function init()
 {
     global $CFG;
     $this->close();
     grade_regrade_final_grades($this->course->id);
     $course_item = grade_item::fetch_course_item($this->course->id);
     if ($course_item->needsupdate) {
         // can not calculate all final grades - sorry
         return false;
     }
     if (strpos($CFG->gradebookroles, ',') !== false) {
         $gradebookroles = " = {$CFG->gradebookroles}";
     } else {
         $gradebookroles = " IN ({$CFG->gradebookroles})";
     }
     $relatedcontexts = get_related_contexts_string(get_context_instance(CONTEXT_COURSE, $this->course->id));
     if ($this->groupid) {
         $groupsql = "INNER JOIN {$CFG->prefix}groups_members gm ON gm.userid = u.id";
         $groupwheresql = "AND gm.groupid = {$this->groupid}";
     } else {
         $groupsql = "";
         $groupwheresql = "";
     }
     $users_sql = "SELECT u.*\n                        FROM {$CFG->prefix}user u\n                             INNER JOIN {$CFG->prefix}role_assignments ra ON u.id = ra.userid\n                             {$groupsql}\n                       WHERE ra.roleid {$gradebookroles}\n                             AND ra.contextid {$relatedcontexts}\n                             {$groupwheresql}\n                    ORDER BY u.id ASC";
     $this->users_rs = get_recordset_sql($users_sql);
     if (!empty($this->grade_items)) {
         $itemids = array_keys($this->grade_items);
         $itemids = implode(',', $itemids);
         $grades_sql = "SELECT g.*\n                             FROM {$CFG->prefix}grade_grades g\n                                  INNER JOIN {$CFG->prefix}user u ON g.userid = u.id\n                                  INNER JOIN {$CFG->prefix}role_assignments ra ON u.id = ra.userid\n                                  {$groupsql}\n                            WHERE ra.roleid {$gradebookroles}\n                                  AND ra.contextid {$relatedcontexts}\n                                  AND g.itemid IN ({$itemids})\n                                  {$groupwheresql}\n                         ORDER BY g.userid ASC, g.itemid ASC";
         $this->grades_rs = get_recordset_sql($grades_sql);
     }
     return true;
 }

 /**
  * Initialise the iterator
  * @return boolean success
  */
 public function init()
 {
     global $CFG, $DB;
     $this->close();
     grade_regrade_final_grades($this->course->id);
     $course_item = grade_item::fetch_course_item($this->course->id);
     if ($course_item->needsupdate) {
         // can not calculate all final grades - sorry
         return false;
     }
     $coursecontext = get_context_instance(CONTEXT_COURSE, $this->course->id);
     $relatedcontexts = get_related_contexts_string($coursecontext);
     list($gradebookroles_sql, $params) = $DB->get_in_or_equal(explode(',', $CFG->gradebookroles), SQL_PARAMS_NAMED, 'grbr');
     //limit to users with an active enrolment
     list($enrolledsql, $enrolledparams) = get_enrolled_sql($coursecontext);
     $params = array_merge($params, $enrolledparams);
     if ($this->groupid) {
         $groupsql = "INNER JOIN {groups_members} gm ON gm.userid = u.id";
         $groupwheresql = "AND gm.groupid = :groupid";
         // $params contents: gradebookroles
         $params['groupid'] = $this->groupid;
     } else {
         $groupsql = "";
         $groupwheresql = "";
     }
     if (empty($this->sortfield1)) {
         // we must do some sorting even if not specified
         $ofields = ", u.id AS usrt";
         $order = "usrt ASC";
     } else {
         $ofields = ", u.{$this->sortfield1} AS usrt1";
         $order = "usrt1 {$this->sortorder1}";
         if (!empty($this->sortfield2)) {
             $ofields .= ", u.{$this->sortfield2} AS usrt2";
             $order .= ", usrt2 {$this->sortorder2}";
         }
         if ($this->sortfield1 != 'id' and $this->sortfield2 != 'id') {
             // user order MUST be the same in both queries,
             // must include the only unique user->id if not already present
             $ofields .= ", u.id AS usrt";
             $order .= ", usrt ASC";
         }
     }
     // $params contents: gradebookroles and groupid (for $groupwheresql)
     $users_sql = "SELECT u.* {$ofields}\n                        FROM {user} u\n                        JOIN ({$enrolledsql}) je ON je.id = u.id\n                             {$groupsql}\n                        JOIN (\n                                  SELECT DISTINCT ra.userid\n                                    FROM {role_assignments} ra\n                                   WHERE ra.roleid {$gradebookroles_sql}\n                                     AND ra.contextid {$relatedcontexts}\n                             ) rainner ON rainner.userid = u.id\n                         WHERE u.deleted = 0\n                             {$groupwheresql}\n                    ORDER BY {$order}";
     $this->users_rs = $DB->get_recordset_sql($users_sql, $params);
     if (!empty($this->grade_items)) {
         $itemids = array_keys($this->grade_items);
         list($itemidsql, $grades_params) = $DB->get_in_or_equal($itemids, SQL_PARAMS_NAMED, 'items');
         $params = array_merge($params, $grades_params);
         // $params contents: gradebookroles, enrolledparams, groupid (for $groupwheresql) and itemids
         $grades_sql = "SELECT g.* {$ofields}\n                             FROM {grade_grades} g\n                             JOIN {user} u ON g.userid = u.id\n                             JOIN ({$enrolledsql}) je ON je.id = u.id\n                                  {$groupsql}\n                             JOIN (\n                                      SELECT DISTINCT ra.userid\n                                        FROM {role_assignments} ra\n                                       WHERE ra.roleid {$gradebookroles_sql}\n                                         AND ra.contextid {$relatedcontexts}\n                                  ) rainner ON rainner.userid = u.id\n                              WHERE u.deleted = 0\n                              AND g.itemid {$itemidsql}\n                              {$groupwheresql}\n                         ORDER BY {$order}, g.itemid ASC";
         $this->grades_rs = $DB->get_recordset_sql($grades_sql, $params);
     } else {
         $this->grades_rs = false;
     }
     return true;
 }

 /**
  * Initialise the iterator
  * @return boolean success
  */
 function init()
 {
     global $CFG;
     $this->close();
     grade_regrade_final_grades($this->course->id);
     $course_item = grade_item::fetch_course_item($this->course->id);
     if ($course_item->needsupdate) {
         // can not calculate all final grades - sorry
         return false;
     }
     if (strpos($CFG->gradebookroles, ',') === false) {
         $gradebookroles = " = {$CFG->gradebookroles}";
     } else {
         $gradebookroles = " IN ({$CFG->gradebookroles})";
     }
     $relatedcontexts = get_related_contexts_string(get_context_instance(CONTEXT_COURSE, $this->course->id));
     if ($this->groupid) {
         $groupsql = "INNER JOIN {$CFG->prefix}groups_members gm ON gm.userid = u.id";
         $groupwheresql = "AND gm.groupid = {$this->groupid}";
     } else {
         $groupsql = "";
         $groupwheresql = "";
     }
     if (empty($this->sortfield1)) {
         // we must do some sorting even if not specified
         $ofields = ", u.id AS usrt";
         $order = "usrt ASC";
     } else {
         $ofields = ", u.{$this->sortfield1} AS usrt1";
         $order = "usrt1 {$this->sortorder1}";
         if (!empty($this->sortfield2)) {
             $ofields .= ", u.{$this->sortfield2} AS usrt2";
             $order .= ", usrt2 {$this->sortorder2}";
         }
         if ($this->sortfield1 != 'id' and $this->sortfield2 != 'id') {
             // user order MUST be the same in both queries, must include the only unique user->id if not already present
             $ofields .= ", u.id AS usrt";
             $order .= ", usrt ASC";
         }
     }
     $users_sql = "SELECT u.* {$ofields}\n                        FROM {$CFG->prefix}user u\n                             INNER JOIN {$CFG->prefix}role_assignments ra ON u.id = ra.userid\n                             {$groupsql}\n                       WHERE ra.roleid {$gradebookroles}\n                             AND ra.contextid {$relatedcontexts}\n                             {$groupwheresql}\n                    ORDER BY {$order}";
     $this->users_rs = get_recordset_sql($users_sql);
     if (!empty($this->grade_items)) {
         $itemids = array_keys($this->grade_items);
         $itemids = implode(',', $itemids);
         $grades_sql = "SELECT g.* {$ofields}\n                             FROM {$CFG->prefix}grade_grades g\n                                  INNER JOIN {$CFG->prefix}user u ON g.userid = u.id\n                                  INNER JOIN {$CFG->prefix}role_assignments ra ON u.id = ra.userid\n                                  {$groupsql}\n                            WHERE ra.roleid {$gradebookroles}\n                                  AND ra.contextid {$relatedcontexts}\n                                  AND g.itemid IN ({$itemids})\n                                  {$groupwheresql}\n                         ORDER BY {$order}, g.itemid ASC";
         $this->grades_rs = get_recordset_sql($grades_sql);
     } else {
         $this->grades_rs = false;
     }
     return true;
 }

 /**
  * Test load_users method.
  */
 public function test_load_users()
 {
     global $DB;
     $this->setAdminUser();
     $this->resetAfterTest(true);
     $roleteacher = $DB->get_record('role', array('shortname' => 'teacher'), '*', MUST_EXIST);
     // Create a course, users and groups.
     $course = $this->getDataGenerator()->create_course();
     $coursecontext = context_course::instance($course->id);
     $group = $this->getDataGenerator()->create_group(array('courseid' => $course->id));
     $teacher = $this->getDataGenerator()->create_user();
     $user1 = $this->getDataGenerator()->create_user();
     $user2 = $this->getDataGenerator()->create_user();
     $this->getDataGenerator()->enrol_user($teacher->id, $course->id, $roleteacher->id);
     $this->getDataGenerator()->enrol_user($user1->id, $course->id);
     $this->getDataGenerator()->enrol_user($user2->id, $course->id);
     $this->getDataGenerator()->create_group_member(array('groupid' => $group->id, 'userid' => $teacher->id));
     $this->getDataGenerator()->create_group_member(array('groupid' => $group->id, 'userid' => $user1->id));
     $this->getDataGenerator()->create_group_member(array('groupid' => $group->id, 'userid' => $user2->id));
     // Perform a regrade before creating the report.
     grade_regrade_final_grades($course->id);
     $screentest = new gradereport_singleview_screen_testable($course->id, 0, $group->id);
     $groupusers = $screentest->test_load_users();
     $this->assertCount(2, $groupusers);
     // Now, let's suspend the enrolment of a user. Should return only one user.
     $this->getDataGenerator()->enrol_user($user2->id, $course->id, $roleteacher->id, 'manual', 0, 0, ENROL_USER_SUSPENDED);
     $users = $screentest->test_load_users();
     $this->assertCount(1, $users);
     // Change the viewsuspendedusers capabilities and set the user preference to display suspended users.
     assign_capability('moodle/course:viewsuspendedusers', CAP_ALLOW, $roleteacher->id, $coursecontext, true);
     set_user_preference('grade_report_showonlyactiveenrol', false, $teacher);
     accesslib_clear_all_caches_for_unit_testing();
     $this->setUser($teacher);
     $screentest = new gradereport_singleview_screen_testable($course->id, 0, $group->id);
     $users = $screentest->test_load_users();
     $this->assertCount(2, $users);
     // Change the capability again, now the user can't see the suspended enrolments.
     assign_capability('moodle/course:viewsuspendedusers', CAP_PROHIBIT, $roleteacher->id, $coursecontext, true);
     set_user_preference('grade_report_showonlyactiveenrol', false, $teacher);
     accesslib_clear_all_caches_for_unit_testing();
     $users = $screentest->test_load_users();
     $this->assertCount(1, $users);
     // Now, activate the user enrolment again. We shall get 2 users now.
     $this->getDataGenerator()->enrol_user($user2->id, $course->id, $roleteacher->id, 'manual', 0, 0, ENROL_USER_ACTIVE);
     $users = $screentest->test_load_users();
     $this->assertCount(2, $users);
 }

 protected function sub_test_grade_category_set_locked()
 {
     $category = new grade_category($this->grade_categories[0]);
     $this->assertTrue(method_exists($category, 'set_locked'));
     //will return false as cannot lock a grade that needs updating
     $this->assertFalse($category->set_locked(1));
     grade_regrade_final_grades($this->courseid);
     //get the category from the db again
     $category = new grade_category($this->grade_categories[0]);
     $this->assertTrue($category->set_locked(1));
 }

//.........这里部分代码省略.........
        mark_context_dirty($context->path);
        $status[] = array('component' => $componentstr, 'item' => get_string('deletecourseoverrides', 'role'), 'error' => false);
    }
    if (!empty($data->reset_roles_local)) {
        $children = get_child_contexts($context);
        foreach ($children as $child) {
            role_unassign(0, 0, 0, $child->id);
        }
        //force refresh for logged in users
        mark_context_dirty($context->path);
        $status[] = array('component' => $componentstr, 'item' => get_string('deletelocalroles', 'role'), 'error' => false);
    }
    // First unenrol users - this cleans some of related user data too, such as forum subscriptions, tracking, etc.
    $data->unenrolled = array();
    if (!empty($data->reset_roles)) {
        foreach ($data->reset_roles as $roleid) {
            if ($users = get_role_users($roleid, $context, false, 'u.id', 'u.id ASC')) {
                foreach ($users as $user) {
                    role_unassign($roleid, $user->id, 0, $context->id);
                    if (!has_capability('moodle/course:view', $context, $user->id)) {
                        $data->unenrolled[$user->id] = $user->id;
                    }
                }
            }
        }
    }
    if (!empty($data->unenrolled)) {
        $status[] = array('component' => $componentstr, 'item' => get_string('unenrol') . ' (' . count($data->unenrolled) . ')', 'error' => false);
    }
    $componentstr = get_string('groups');
    // remove all group members
    if (!empty($data->reset_groups_members)) {
        groups_delete_group_members($data->courseid);
        $status[] = array('component' => $componentstr, 'item' => get_string('removegroupsmembers', 'group'), 'error' => false);
    }
    // remove all groups
    if (!empty($data->reset_groups_remove)) {
        groups_delete_groups($data->courseid, false);
        $status[] = array('component' => $componentstr, 'item' => get_string('deleteallgroups', 'group'), 'error' => false);
    }
    // remove all grouping members
    if (!empty($data->reset_groupings_members)) {
        groups_delete_groupings_groups($data->courseid, false);
        $status[] = array('component' => $componentstr, 'item' => get_string('removegroupingsmembers', 'group'), 'error' => false);
    }
    // remove all groupings
    if (!empty($data->reset_groupings_remove)) {
        groups_delete_groupings($data->courseid, false);
        $status[] = array('component' => $componentstr, 'item' => get_string('deleteallgroupings', 'group'), 'error' => false);
    }
    // Look in every instance of every module for data to delete
    $unsupported_mods = array();
    if ($allmods = get_records('modules')) {
        foreach ($allmods as $mod) {
            $modname = $mod->name;
            if (!count_records($modname, 'course', $data->courseid)) {
                continue;
                // skip mods with no instances
            }
            $modfile = $CFG->dirroot . '/mod/' . $modname . '/lib.php';
            $moddeleteuserdata = $modname . '_reset_userdata';
            // Function to delete user data
            if (file_exists($modfile)) {
                include_once $modfile;
                if (function_exists($moddeleteuserdata)) {
                    $modstatus = $moddeleteuserdata($data);
                    if (is_array($modstatus)) {
                        $status = array_merge($status, $modstatus);
                    } else {
                        debugging('Module ' . $modname . ' returned incorrect staus - must be an array!');
                    }
                } else {
                    $unsupported_mods[] = $mod;
                }
            } else {
                debugging('Missing lib.php in ' . $modname . ' module!');
            }
        }
    }
    // mention unsupported mods
    if (!empty($unsupported_mods)) {
        foreach ($unsupported_mods as $mod) {
            $status[] = array('component' => get_string('modulenameplural', $mod->name), 'item' => '', 'error' => get_string('resetnotimplemented'));
        }
    }
    $componentstr = get_string('gradebook', 'grades');
    // reset gradebook
    if (!empty($data->reset_gradebook_items)) {
        remove_course_grades($data->courseid, false);
        grade_grab_course_grades($data->courseid);
        grade_regrade_final_grades($data->courseid);
        $status[] = array('component' => $componentstr, 'item' => get_string('removeallcourseitems', 'grades'), 'error' => false);
    } else {
        if (!empty($data->reset_gradebook_grades)) {
            grade_course_reset($data->courseid);
            $status[] = array('component' => $componentstr, 'item' => get_string('removeallcoursegrades', 'grades'), 'error' => false);
        }
    }
    return $status;
}

    /**
     * Initialise the iterator
     * @return boolean success
     */
    public function init() {
        global $CFG, $DB;

        $this->close();

        grade_regrade_final_grades($this->course->id);
        $course_item = grade_item::fetch_course_item($this->course->id);
        if ($course_item->needsupdate) {
            // can not calculate all final grades - sorry
            return false;
        }

        list($gradebookroles_sql, $params) =
            $DB->get_in_or_equal(explode(',', $CFG->gradebookroles), SQL_PARAMS_NAMED, 'grbr0');

        $relatedcontexts = get_related_contexts_string(get_context_instance(CONTEXT_COURSE, $this->course->id));

        if ($this->groupid) {
            $groupsql = "INNER JOIN {groups_members} gm ON gm.userid = u.id";
            $groupwheresql = "AND gm.groupid = :groupid";
            // $params contents: gradebookroles
            $params['groupid'] = $this->groupid;
        } else {
            $groupsql = "";
            $groupwheresql = "";
        }

        if (empty($this->sortfield1)) {
            // we must do some sorting even if not specified
            $ofields = ", u.id AS usrt";
            $order   = "usrt ASC";

        } else {
            $ofields = ", u.$this->sortfield1 AS usrt1";
            $order   = "usrt1 $this->sortorder1";
            if (!empty($this->sortfield2)) {
                $ofields .= ", u.$this->sortfield2 AS usrt2";
                $order   .= ", usrt2 $this->sortorder2";
            }
            if ($this->sortfield1 != 'id' and $this->sortfield2 != 'id') {
                // user order MUST be the same in both queries,
                // must include the only unique user->id if not already present
                $ofields .= ", u.id AS usrt";
                $order   .= ", usrt ASC";
            }
        }

        // $params contents: gradebookroles and groupid (for $groupwheresql)
        $users_sql = "SELECT u.* $ofields
                        FROM {user} u
                             INNER JOIN {role_assignments} ra ON u.id = ra.userid
                             $groupsql
                       WHERE u.deleted=0
                             AND ra.roleid $gradebookroles_sql
                             AND ra.contextid $relatedcontexts
                             $groupwheresql
                    ORDER BY $order";

        $this->users_rs = $DB->get_recordset_sql($users_sql, $params);

        if (!empty($this->grade_items)) {
            $itemids = array_keys($this->grade_items);
            list($itemidsql, $grades_params) = $DB->get_in_or_equal($itemids, SQL_PARAMS_NAMED, 'items0');
            $params = array_merge($params, $grades_params);

            // $params contents: gradebookroles, groupid (for $groupwheresql) and itemids
            $grades_sql = "SELECT g.* $ofields
                             FROM {grade_grades} g
                                  INNER JOIN {user} u ON g.userid = u.id
                                  INNER JOIN {role_assignments} ra ON u.id = ra.userid
                                  $groupsql
                            WHERE ra.roleid $gradebookroles_sql
                                  AND ra.contextid $relatedcontexts
                                  $groupwheresql
                                  AND g.itemid $itemidsql
                         ORDER BY $order, g.itemid ASC";
            $this->grades_rs = $DB->get_recordset_sql($grades_sql, $params);
        } else {
            $this->grades_rs = false;
        }

        return true;
    }

/**
 * Profile report callback.
 *
 * @param object $course The course.
 * @param object $user The user.
 * @param boolean $viewasuser True when we are viewing this as the targetted user sees it.
 */
function grade_report_user_profilereport($course, $user, $viewasuser = false)
{
    global $OUTPUT;
    if (!empty($course->showgrades)) {
        $context = context_course::instance($course->id);
        //first make sure we have proper final grades - this must be done before constructing of the grade tree
        grade_regrade_final_grades($course->id);
        /// return tracking object
        $gpr = new grade_plugin_return(array('type' => 'report', 'plugin' => 'user', 'courseid' => $course->id, 'userid' => $user->id));
        // Create a report instance
        $report = new grade_report_user($course->id, $gpr, $context, $user->id, $viewasuser);
        // print the page
        echo '<div class="grade-report-user">';
        // css fix to share styles with real report page
        echo $OUTPUT->heading(get_string('pluginname', 'gradereport_user') . ' - ' . fullname($report->user));
        if ($report->fill_table()) {
            echo $report->print_table(true);
        }
        echo '</div>';
    }
}

    protected function after_execute() {
        global $DB;

        $conditions = array(
            'backupid' => $this->get_restoreid(),
            'itemname' => 'grade_item'//,
            //'itemid'   => $itemid
        );
        $rs = $DB->get_recordset('backup_ids_temp', $conditions);

        if (!empty($rs)) {
            foreach($rs as $grade_item_backup) {
                $updateobj = new stdclass();
                $updateobj->id = $grade_item_backup->newitemid;

                //if this is an activity grade item that needs to be put back in its correct category
                if (!empty($grade_item_backup->parentitemid)) {
                    $updateobj->categoryid = $this->get_mappingid('grade_category', $grade_item_backup->parentitemid);
                } else {
                    //mark course and category items as needing to be recalculated
                    $updateobj->needsupdate=1;
                }
                $DB->update_record('grade_items', $updateobj);
            }
        }
        $rs->close();

        //need to correct the grade category path and parent
        $conditions = array(
            'courseid' => $this->get_courseid()
        );
        $grade_category = new stdclass();

        $rs = $DB->get_recordset('grade_categories', $conditions);
        if (!empty($rs)) {
            //get all the parents correct first as grade_category::build_path() loads category parents from the DB
            foreach($rs as $gc) {
                if (!empty($gc->parent)) {
                    $grade_category->id = $gc->id;
                    $grade_category->parent = $this->get_mappingid('grade_category', $gc->parent);
                    $DB->update_record('grade_categories', $grade_category);
                }
            }
        }
        if (isset($grade_category->parent)) {
            unset($grade_category->parent);
        }
        $rs->close();

        $rs = $DB->get_recordset('grade_categories', $conditions);
        if (!empty($rs)) {
            //now we can rebuild all the paths
            foreach($rs as $gc) {
                $grade_category->id = $gc->id;
                $grade_category->path = grade_category::build_path($gc);
                $DB->update_record('grade_categories', $grade_category);
            }
        }
        $rs->close();

        //Restore marks items as needing update. Update everything now.
        grade_regrade_final_grades($this->get_courseid());
    }

//.........这里部分代码省略.........
                $sql = "SELECT ue.*\n                          FROM {user_enrolments} ue\n                          JOIN {enrol} e ON (e.id = ue.enrolid AND e.courseid = :courseid)\n                          JOIN {context} c ON (c.contextlevel = :courselevel AND c.instanceid = e.courseid)\n                     LEFT JOIN {role_assignments} ra ON (ra.contextid = c.id AND ra.userid = ue.userid)\n                         WHERE ra.id IS null";
                $params = array('courseid' => $data->courseid, 'courselevel' => CONTEXT_COURSE);
            }
            $rs = $DB->get_recordset_sql($sql, $params);
            foreach ($rs as $ue) {
                if (!isset($instances[$ue->enrolid])) {
                    continue;
                }
                $instance = $instances[$ue->enrolid];
                $plugin = $plugins[$instance->enrol];
                if (!$plugin->allow_unenrol($instance) and !$plugin->allow_unenrol_user($instance, $ue)) {
                    continue;
                }
                $plugin->unenrol_user($instance, $ue->userid);
                $data->unenrolled[$ue->userid] = $ue->userid;
            }
            $rs->close();
        }
    }
    if (!empty($data->unenrolled)) {
        $status[] = array('component' => $componentstr, 'item' => get_string('unenrol', 'enrol') . ' (' . count($data->unenrolled) . ')', 'error' => false);
    }
    $componentstr = get_string('groups');
    // Remove all group members.
    if (!empty($data->reset_groups_members)) {
        groups_delete_group_members($data->courseid);
        $status[] = array('component' => $componentstr, 'item' => get_string('removegroupsmembers', 'group'), 'error' => false);
    }
    // Remove all groups.
    if (!empty($data->reset_groups_remove)) {
        groups_delete_groups($data->courseid, false);
        $status[] = array('component' => $componentstr, 'item' => get_string('deleteallgroups', 'group'), 'error' => false);
    }
    // Remove all grouping members.
    if (!empty($data->reset_groupings_members)) {
        groups_delete_groupings_groups($data->courseid, false);
        $status[] = array('component' => $componentstr, 'item' => get_string('removegroupingsmembers', 'group'), 'error' => false);
    }
    // Remove all groupings.
    if (!empty($data->reset_groupings_remove)) {
        groups_delete_groupings($data->courseid, false);
        $status[] = array('component' => $componentstr, 'item' => get_string('deleteallgroupings', 'group'), 'error' => false);
    }
    // Look in every instance of every module for data to delete.
    $unsupportedmods = array();
    if ($allmods = $DB->get_records('modules')) {
        foreach ($allmods as $mod) {
            $modname = $mod->name;
            $modfile = $CFG->dirroot . '/mod/' . $modname . '/lib.php';
            $moddeleteuserdata = $modname . '_reset_userdata';
            // Function to delete user data.
            if (file_exists($modfile)) {
                if (!$DB->count_records($modname, array('course' => $data->courseid))) {
                    continue;
                    // Skip mods with no instances.
                }
                include_once $modfile;
                if (function_exists($moddeleteuserdata)) {
                    $modstatus = $moddeleteuserdata($data);
                    if (is_array($modstatus)) {
                        $status = array_merge($status, $modstatus);
                    } else {
                        debugging('Module ' . $modname . ' returned incorrect staus - must be an array!');
                    }
                } else {
                    $unsupportedmods[] = $mod;
                }
            } else {
                debugging('Missing lib.php in ' . $modname . ' module!');
            }
        }
    }
    // Mention unsupported mods.
    if (!empty($unsupportedmods)) {
        foreach ($unsupportedmods as $mod) {
            $status[] = array('component' => get_string('modulenameplural', $mod->name), 'item' => '', 'error' => get_string('resetnotimplemented'));
        }
    }
    $componentstr = get_string('gradebook', 'grades');
    // Reset gradebook,.
    if (!empty($data->reset_gradebook_items)) {
        remove_course_grades($data->courseid, false);
        grade_grab_course_grades($data->courseid);
        grade_regrade_final_grades($data->courseid);
        $status[] = array('component' => $componentstr, 'item' => get_string('removeallcourseitems', 'grades'), 'error' => false);
    } else {
        if (!empty($data->reset_gradebook_grades)) {
            grade_course_reset($data->courseid);
            $status[] = array('component' => $componentstr, 'item' => get_string('removeallcoursegrades', 'grades'), 'error' => false);
        }
    }
    // Reset comments.
    if (!empty($data->reset_comments)) {
        require_once $CFG->dirroot . '/comment/lib.php';
        comment::reset_course_page_comments($context);
    }
    $event = \core\event\course_reset_ended::create($eventparams);
    $event->trigger();
    return $status;
}

function backup_gradebook_info($bf, $preferences)
{
    global $CFG;
    require_once $CFG->libdir . '/gradelib.php';
    //first make sure items are properly sorted and everything is ok
    grade_category::fetch_course_tree($preferences->backup_course, true);
    grade_regrade_final_grades($preferences->backup_course);
    $status = true;
    // see if ALL grade items of type mod of this course are being backed up
    // if not, we do not need to backup grade category and associated grade items/grades
    $backupall = true;
    if ($grade_items = get_records_sql("SELECT *\n                                              FROM {$CFG->prefix}grade_items\n                                             WHERE courseid = {$preferences->backup_course}\n                                                   AND itemtype = 'mod'")) {
        foreach ($grade_items as $grade_item) {
            // get module information
            // if some activities not selected, we do not backup categories at all
            if (!backup_mod_selected($preferences, $grade_item->itemmodule, $grade_item->iteminstance)) {
                $backupall = false;
                break;
            }
        }
        unset($grade_items);
        //free memory
    }
    //Gradebook header
    fwrite($bf, start_tag("GRADEBOOK", 2, true));
    $status = backup_gradebook_outcomes_info($bf, $preferences);
    $status = backup_gradebook_grade_letters_info($bf, $preferences);
    // Now backup grade_item (inside grade_category)
    if ($backupall) {
        $status = backup_gradebook_category_info($bf, $preferences);
    }
    $status = backup_gradebook_item_info($bf, $preferences, $backupall);
    // backup gradebook histories (only if grade history is enabled and selected)
    if (empty($CFG->disablegradehistory) && $preferences->backup_gradebook_history) {
        $status = backup_gradebook_outcomes_history($bf, $preferences);
        $status = backup_gradebook_categories_history_info($bf, $preferences);
        $status = backup_gradebook_items_history_info($bf, $preferences);
        $status = backup_gradebook_grades_history_info($bf, $preferences);
    }
    //Gradebook footer
    $status = fwrite($bf, end_tag("GRADEBOOK", 2, true));
    return $status;
}

//.........这里部分代码省略.........
    // Hide the min/max warning if the user told it to go away.
    if ($hideminmaxwarning) {
        grade_hide_min_max_grade_upgrade_notice($courseid);
        $showminmaxwarning = false;
    }
    if ($useminmaxfromgradegrade) {
        // Revert to the new behaviour, we now use the grade_grade for min/max.
        grade_upgrade_use_min_max_from_grade_grade($courseid);
        grade_hide_min_max_grade_upgrade_notice($courseid);
        $showminmaxwarning = false;
    } else {
        if ($useminmaxfromgradeitem) {
            // Apply the new logic, we now use the grade_item for min/max.
            grade_upgrade_use_min_max_from_grade_item($courseid);
            grade_hide_min_max_grade_upgrade_notice($courseid);
            $showminmaxwarning = false;
        }
    }
    if (!$hidenaturalwarning && $shownaturalwarning) {
        $message = get_string('sumofgradesupgradedgrades', 'grades');
        $hidemessage = get_string('upgradedgradeshidemessage', 'grades');
        $urlparams = array('id' => $courseid, 'seensumofgradesupgradedgrades' => true, 'sesskey' => sesskey());
        $goawayurl = new moodle_url($thispage, $urlparams);
        $goawaybutton = $OUTPUT->single_button($goawayurl, $hidemessage, 'get');
        $html .= $OUTPUT->notification($message, 'notifysuccess');
        $html .= $goawaybutton;
    }
    if (!$hidesubcatswarning && $showsubcatswarning) {
        $message = get_string('aggregatesubcatsupgradedgrades', 'grades');
        $hidemessage = get_string('upgradedgradeshidemessage', 'grades');
        $urlparams = array('id' => $courseid, 'seenaggregatesubcatsupgradedgrades' => true, 'sesskey' => sesskey());
        $goawayurl = new moodle_url($thispage, $urlparams);
        $goawaybutton = $OUTPUT->single_button($goawayurl, $hidemessage, 'get');
        $html .= $OUTPUT->notification($message, 'notifysuccess');
        $html .= $goawaybutton;
    }
    if ($showminmaxwarning) {
        $hidemessage = get_string('upgradedgradeshidemessage', 'grades');
        $urlparams = array('id' => $courseid, 'seenminmaxupgradedgrades' => true, 'sesskey' => sesskey());
        $goawayurl = new moodle_url($thispage, $urlparams);
        $hideminmaxbutton = $OUTPUT->single_button($goawayurl, $hidemessage, 'get');
        $moreinfo = html_writer::link(get_docs_url(get_string('minmaxtouse_link', 'grades')), get_string('moreinfo'), array('target' => '_blank'));
        if ($minmaxtouse == GRADE_MIN_MAX_FROM_GRADE_ITEM) {
            // Show the message that there were min/max issues that have been resolved.
            $message = get_string('minmaxupgradedgrades', 'grades') . ' ' . $moreinfo;
            $revertmessage = get_string('upgradedminmaxrevertmessage', 'grades');
            $urlparams = array('id' => $courseid, 'useminmaxfromgradegrade' => true, 'sesskey' => sesskey());
            $reverturl = new moodle_url($thispage, $urlparams);
            $revertbutton = $OUTPUT->single_button($reverturl, $revertmessage, 'get');
            $html .= $OUTPUT->notification($message);
            $html .= $revertbutton . $hideminmaxbutton;
        } else {
            if ($minmaxtouse == GRADE_MIN_MAX_FROM_GRADE_GRADE) {
                // Show the warning that there are min/max issues that have not be resolved.
                $message = get_string('minmaxupgradewarning', 'grades') . ' ' . $moreinfo;
                $fixmessage = get_string('minmaxupgradefixbutton', 'grades');
                $urlparams = array('id' => $courseid, 'useminmaxfromgradeitem' => true, 'sesskey' => sesskey());
                $fixurl = new moodle_url($thispage, $urlparams);
                $fixbutton = $OUTPUT->single_button($fixurl, $fixmessage, 'get');
                $html .= $OUTPUT->notification($message);
                $html .= $fixbutton . $hideminmaxbutton;
            }
        }
    }
    if ($gradebookcalculationsfreeze) {
        if ($acceptgradebookchanges) {
            // Accept potential changes in grades caused by extra credit bug MDL-49257.
            hide_gradebook_calculations_freeze_notice($courseid);
            $courseitem = grade_item::fetch_course_item($courseid);
            $courseitem->force_regrading();
            grade_regrade_final_grades($courseid);
            $html .= $OUTPUT->notification(get_string('gradebookcalculationsuptodate', 'grades'), 'notifysuccess');
        } else {
            // Show the warning that there may be extra credit weights problems.
            $a = new stdClass();
            $a->gradebookversion = $gradebookcalculationsfreeze;
            if (preg_match('/(\\d{8,})/', $CFG->release, $matches)) {
                $a->currentversion = $matches[1];
            } else {
                $a->currentversion = $CFG->release;
            }
            $a->url = get_docs_url('Gradebook_calculation_changes');
            $message = get_string('gradebookcalculationswarning', 'grades', $a);
            $fixmessage = get_string('gradebookcalculationsfixbutton', 'grades');
            $urlparams = array('id' => $courseid, 'acceptgradebookchanges' => true, 'sesskey' => sesskey());
            $fixurl = new moodle_url($thispage, $urlparams);
            $fixbutton = $OUTPUT->single_button($fixurl, $fixmessage, 'get');
            $html .= $OUTPUT->notification($message);
            $html .= $fixbutton;
        }
    }
    if (!empty($html)) {
        $html = html_writer::tag('div', $html, array('class' => 'core_grades_notices'));
    }
    if ($return) {
        return $html;
    } else {
        echo $html;
    }
}

//.........这里部分代码省略.........
     if (is_null($grade)) {
         //fetch from db
         $grade = new grade_grade(array('itemid' => $this->id, 'userid' => $userid));
     }
     $grade->grade_item =& $this;
     // prevent db fetching of this grade_item
     if (empty($usermodified)) {
         $grade->usermodified = $USER->id;
     } else {
         $grade->usermodified = $usermodified;
     }
     if ($grade->is_locked()) {
         // do not update locked grades at all
         return false;
     }
     $locktime = $grade->get_locktime();
     if ($locktime and $locktime < time()) {
         // do not update grades that should be already locked and force regrade
         $this->force_regrading();
         return false;
     }
     $oldgrade = new object();
     $oldgrade->finalgrade = $grade->finalgrade;
     $oldgrade->rawgrade = $grade->rawgrade;
     $oldgrade->rawgrademin = $grade->rawgrademin;
     $oldgrade->rawgrademax = $grade->rawgrademax;
     $oldgrade->rawscaleid = $grade->rawscaleid;
     $oldgrade->feedback = $grade->feedback;
     $oldgrade->feedbackformat = $grade->feedbackformat;
     // use new min and max
     $grade->rawgrade = $grade->rawgrade;
     $grade->rawgrademin = $this->grademin;
     $grade->rawgrademax = $this->grademax;
     $grade->rawscaleid = $this->scaleid;
     // change raw grade?
     if ($rawgrade !== false) {
         $grade->rawgrade = $rawgrade;
     }
     // empty feedback means no feedback at all
     if ($feedback === '') {
         $feedback = null;
     }
     // do we have comment from teacher?
     if ($feedback !== false and !$grade->is_overridden()) {
         $grade->feedback = $feedback;
         $grade->feedbackformat = $feedbackformat;
     }
     // update final grade if possible
     if (!$grade->is_locked() and !$grade->is_overridden()) {
         $grade->finalgrade = $this->adjust_raw_grade($grade->rawgrade, $grade->rawgrademin, $grade->rawgrademax);
     }
     // TODO: hack alert - create new fields for these in 2.0
     $oldgrade->timecreated = $grade->timecreated;
     $oldgrade->timemodified = $grade->timemodified;
     $grade->timecreated = $datesubmitted;
     if ($grade->is_overridden()) {
         // keep original graded date - update_final_grade() sets this for overridden grades
     } else {
         if (is_null($grade->rawgrade) and is_null($grade->feedback)) {
             // no grade and feedback means no grading yet
             $grade->timemodified = null;
         } else {
             if (!empty($dategraded)) {
                 // fine - module sends info when graded (yay!)
                 $grade->timemodified = $dategraded;
             } else {
                 if (grade_floats_different($grade->finalgrade, $oldgrade->finalgrade) or $grade->feedback !== $oldgrade->feedback) {
                     // guess - if either grade or feedback changed set new graded date
                     $grade->timemodified = time();
                 } else {
                     //keep original graded date
                 }
             }
         }
     }
     // end of hack alert
     if (empty($grade->id)) {
         $result = (bool) $grade->insert($source);
     } else {
         if (grade_floats_different($grade->finalgrade, $oldgrade->finalgrade) or grade_floats_different($grade->rawgrade, $oldgrade->rawgrade) or grade_floats_different($grade->rawgrademin, $oldgrade->rawgrademin) or grade_floats_different($grade->rawgrademax, $oldgrade->rawgrademax) or $grade->rawscaleid != $oldgrade->rawscaleid or $grade->feedback !== $oldgrade->feedback or $grade->feedbackformat != $oldgrade->feedbackformat or $grade->timecreated != $oldgrade->timecreated or $grade->timemodified != $oldgrade->timemodified) {
             $result = $grade->update($source);
         } else {
             return $result;
         }
     }
     if (!$result) {
         // something went wrong - better force final grade recalculation
         $this->force_regrading();
     } else {
         if (!$this->needsupdate) {
             $course_item = grade_item::fetch_course_item($this->courseid);
             if (!$course_item->needsupdate) {
                 if (grade_regrade_final_grades($this->courseid, $userid, $this) !== true) {
                     $this->force_regrading();
                 }
             }
         }
     }
     return $result;
 }

 /**
  * Initialise the iterator
  *
  * @return boolean success
  */