<?php // $Id$

/// Shows all the groups in a course.  
/// Editing teachers see a nifty interface for defining groups

	require_once('../config.php');
	require_once('lib.php');

    require_variable($id);        // Course id
    optional_variable($edit);     // Turn editing on and off

    if (! $course = get_record('course', 'id', $id) ) {
        error("That's an invalid course id");
    }

    require_login($course->id);

    if (!isteacheredit($course->id) and $course->groupmode != VISIBLEGROUPS) {
        redirect("group.php?id=$course->id");   // Not allowed to see all groups
    }

    if (isteacheredit($course->id)) {
        if (isset($_GET['edit'])) {
            if($edit == "on") {
                $USER->groupsediting = true;
            } else {
                $USER->groupsediting = false;
            }
        }
    } else {
        $USER->groupsediting = false;
    }


/// Print the header of the page

    $strgroup = get_string('group');
    $strgroups = get_string('groups');
    $streditgroupprofile = get_string('editgroupprofile');
    $strgroupmemberssee = get_string('groupmemberssee');
    $loggedinas = "<p class=\"logininfo\">".user_login_string($course, $USER)."</p>";

    print_header("$course->shortname: $strgroups", "$course->fullname", 
                 "<a href=\"$CFG->wwwroot/course/view.php?id=$course->id\">$course->shortname</a> 
                  -> $strgroups", "", "", true, update_groups_button($course->id), $loggedinas);


/// Get the current list of groups

    $groups = get_groups($course->id);

    if (!$USER->groupsediting) {         /// Display an overview of all groups
        if (!$groups) {
            print_heading(get_string('groupsnone'));

        } else {  
            $isteacher = isteacher($course->id);
            $isteacheredit = isteacheredit($course->id);
            foreach ($groups as $group) {
                $t = $group;
                $t->description = format_text($group->description);
                $t->picture = print_group_picture($group, $course->id, true, true, true);
                if ($t->users = get_group_users($group->id, 'u.lastname ASC')) {
                    foreach ($t->users as $key => $user) {
                        $t->users[$key]->fullname = fullname($user, $isteacher);
                    }
                }
                if ($isteacheredit or ($isteacher and ismember($group->id))) {
                    $t->linkeditprofile->url = "group.php?id=$course->id&group=$group->id&edit=on";
                    $t->linkeditprofile->text = $streditgroupprofile;
                }
                $t->linkfullprofile->url = "group.php?id=$course->id&group=$group->id";
                $t->linkfullprofile->text = $strgroupmemberssee;

                include('groups-summary.html');
            }
        }
        print_footer($course);
        exit;
    }


/// We are in editing mode.  First, process any inputs there may be.

    if ($data = data_submitted()) {

        if (!empty($data->nonmembersadd)) {            /// Add people to a group
            if (!empty($data->nonmembers) and !empty($data->groupid)) {
                $groupmodified = false;
                foreach ($data->nonmembers as $userid) {
                    if (!user_group($course->id, $userid)) {  // Just to make sure (another teacher could be editing)
                        $record->groupid = $data->groupid;
                        $record->userid = $userid;
                        $record->timeadded = time();
                        if (!insert_record('groups_members', $record)) {
                            notify("Error occurred while adding user $userid to group $data->groupid");
                        }
                        $groupmodified = true;
                    }
                }
                if ($groupmodified) {
                    set_field('groups', 'timemodified', time(), 'id', $data->groupid);
                }
            }
            $selectedgroup = $data->groupid;


        } else if (!empty($data->nonmembersrandom)) {  /// Add all non members to groups
            notify("Random adding of people into groups is not functional yet.");

        } else if (!empty($data->nonmembersinfo)) {    /// Return info about the selected users
            notify("You must turn Javascript on");

        } else if (!empty($data->groupsremove)) {      /// Remove a group, all members become nonmembers
            if (!empty($data->groups)) {
                delete_records("groups", "id", $data->groups);
                delete_records("groups_members", "groupid", $data->groups);
                unset($groups[$data->groups]);
            }
            

        } else if (!empty($data->groupsinfo)) {        /// Display full info for a group
            notify("You must turn Javascript on");

        } else if (!empty($data->groupsadd)) {         /// Create a new group
            if (!empty($data->newgroupname)) {
                $newgroup->name = $data->newgroupname;
                $newgroup->courseid = $course->id;
                $newgroup->lang = current_language();
                $newgroup->timecreated = time();
                if (!insert_record("groups", $newgroup)) {
                    notify("Could not insert the new group '$newgroup->name'");
                }
                $groups = get_groups($course->id);
            }

        } else if (!empty($data->membersremove)) {     /// Remove selected people from a particular group

            if (!empty($data->members) and !empty($data->groupid)) {
                foreach ($data->members as $userid) {
                    delete_records('groups_members', 'userid', $userid, "groupid", $data->groupid);
                    set_field('groups', 'timemodified', time(), 'id', $data->groupid);
                }
            }
            $selectedgroup = $data->groupid;

        } else if (!empty($data->membersinfo)) {       /// Return info about the selected users
            notify("You must turn Javascript on");

        }
    }


/// Calculate data ready to create the editing interface

    $strgroupnonmembers = get_string('groupnonmembers');
    $strgroupmembersselected = get_string('groupmembersselected');
    $strgroupremovemembers = get_string('groupremovemembers');
    $strgroupinfomembers = get_string('groupinfomembers');
    $strgroupadd = get_string('groupadd');
    $strgroupremove = get_string('groupremove');
    $strgroupinfo = get_string('groupinfo');
    $strgroupinfopeople = get_string('groupinfopeople');
    $strgrouprandomassign = get_string('grouprandomassign');
    $strgroupaddusers = get_string('groupaddusers');
    $courseid = $course->id;
    $listgroups = array();
    $listmembers = array();
    $nonmembers = array();
    $groupcount = count($groups);


/// First, get everyone into the nonmembers array

    if ($students = get_course_students($course->id)) {
        foreach ($students as $student) {
            $nonmembers[$student->id] = fullname($student, true);
        }
        unset($students);
    }

    if ($teachers = get_course_teachers($course->id)) {
        foreach ($teachers as $teacher) {
            $prefix = '- ';
            if (isteacheredit($course->id, $teacher->id)) {
                $prefix = '# ';
            }
            $nonmembers[$teacher->id] = $prefix.fullname($teacher, true);
        }
        unset($teachers);
    }

/// Pull out all the members into little arrays

    if ($groups) {
        foreach ($groups as $group) {
            $countusers = 0;
            $listmembers[$group->id] = array();
            if ($groupusers = get_group_users($group->id)) {
                foreach ($groupusers as $groupuser) {
                    $listmembers[$group->id][$groupuser->id] = $nonmembers[$groupuser->id];
                    unset($nonmembers[$groupuser->id]);
                    $countusers++;
                }
                natcasesort($listmembers[$group->id]);
            }
            $listgroups[$group->id] = $group->name." ($countusers)";
        }
        natcasesort($listgroups);
    }

    natcasesort($nonmembers);

    if (empty($selectedgroup)) {    // Choose the first group by default
        if ($selectedgroup = array_shift(array_keys($listgroups))) {
            $members = $listmembers[$selectedgroup];
        }
    } else {
        $members = $listmembers[$selectedgroup];
    }

/// Print out the complete form

    include('groups-edit.html');

    print_footer($course);

?>