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<?PHP // $Id$
// Moves, adds, updates or deletes modules in a course
require("../config.php");
if (isset($course) && isset($HTTP_POST_VARS)) { // add or update form submitted
$mod = (object)$HTTP_POST_VARS;
require_login($mod->course);
if (!isteacher($mod->course)) {
error("You can't modify this course!");
}
$modcode = "../mod/$mod->modulename/mod.php";
if (file_exists($modcode)) {
include($modcode);
} else {
error("This module is missing important code! (mod.php)");
}
switch ($mod->mode) {
case "update":
if (! update_instance($mod)) {
error("Could not update the $mod->modulename");
}
add_to_log("Updated $mod->modulename $mod->instance", $mod->course);
break;
case "add":
if (! $mod->instance = add_instance($mod)) {
error("Could not add a new instance of $mod->modulename");
}
// course_modules and course_weeks each contain a reference
// to each other, so we have to update one of them twice.
if (! $mod->course_module = add_course_module($mod) ) {
error("Could not add a new course module");
}
if (! $weekid = add_mod_to_week($mod) ) {
error("Could not add the new course module to that week");
}
if (! set_field("course_modules", "week", $weekid, "id", $mod->course_module)) {
error("Could not update the course module with the correct week");
}
add_to_log("Added $mod->modulename $mod->instance", $mod->course);
break;
case "delete":
if (! delete_instance($mod->instance)) {
error("Could not delete the $mod->modulename");
}
if (! delete_course_module($mod->coursemodule)) {
error("Could not delete the $mod->modulename");
}
if (! delete_mod_from_week($mod->coursemodule, "$mod->week")) {
error("Could not delete the $mod->modulename from that week");
}
add_to_log("Deleted $mod->modulename $mod->instance", $mod->course);
break;
default:
error("No mode defined");
}
redirect("view.php?id=$mod->course");
exit;
}
if (isset($move)) {
require_variable($id);
move_module($id, $move);
redirect($HTTP_REFERER);
exit;
} else if (isset($delete)) { // value = course module
if (! $cm = get_record("course_modules", "id", $delete)) {
error("This course module doesn't exist");
}
if (! $course = get_record("course", "id", $cm->course)) {
error("This course doesn't exist");
}
if (! $module = get_record("modules", "id", $cm->module)) {
error("This module doesn't exist");
}
require_login($course->id);
if (!isteacher($course->id)) {
error("You can't modify this course!");
}
$form->coursemodule = $cm->id;
$form->week = $cm->week;
$form->course = $cm->course;
$form->instance = $cm->instance;
$form->modulename = $module->name;
include("mod_delete.html");
exit;
} else if (isset($update)) { // value = course module
if (! $cm = get_record("course_modules", "id", $update)) {
error("This course module doesn't exist");
}
if (! $course = get_record("course", "id", $cm->course)) {
error("This course doesn't exist");
}
if (! $module = get_record("modules", "id", $cm->module)) {
error("This module doesn't exist");
}
if (! $form = get_record($module->name, "id", $cm->instance)) {
error("The required instance of this module doesn't exist");
}
if (! $cw = get_record("course_weeks", "id", $cm->week)) {
error("This course week doesn't exist");
}
$form->week = $cm->week; // The week ID
$form->course = $course->id;
$form->module = $module->id;
$form->modulename = $module->name;
$form->instance = $cm->instance;
$form->mode = "update";
$pageheading = "Updating a $module->fullname in Week $cw->week";
} else if (isset($add)) {
if (!$add) {
redirect($HTTP_REFERER);
die;
}
require_variable($id);
require_variable($week);
if (! $course = get_record("course", "id", $id)) {
error("This course doesn't exist");
}
if (! $module = get_record("modules", "name", $add)) {
error("This module type doesn't exist");
}
$form->week = $week; // The week number itself
$form->course = $course->id;
$form->module = $module->id;
$form->modulename = $module->name;
$form->instance = $cm->instance;
$form->mode = "add";
if ($form->week) {
$pageheading = "Adding a new $module->fullname to Week $form->week";
} else {
$pageheading = "Adding a new $module->fullname";
}
} else {
error("No action was specfied");
}
require_login($course->id);
if (!isteacher($course->id)) {
error("You can't modify this course!");
}
if ($course->category) {
print_header("$course->shortname: Editing a $module->fullname",
"$course->shortname: Editing a $module->fullname",
"<A HREF=\"$CFG->wwwroot/course/view.php?id=$course->id\">$course->shortname</A> ->
Editing a $module->fullname", "form.name");
} else {
print_header("$course->shortname: Editing a $module->fullname",
"$course->shortname: Editing a $module->fullname",
"Editing a $module->fullname", "form.name");
}
$modform = "../mod/$module->name/mod.html";
if (file_exists($modform)) {
print_heading($pageheading);
print_simple_box_start("center", "", "$THEME->cellheading");
include($modform);
print_simple_box_end();
} else {
notice("This module cannot be added to this course yet!", "$CFG->wwwroot/course/view.php?id=$course->id");
}
print_footer($course);
exit;
/// FUNCTIONS //////////////////////////////////////////////////////////////////////
function add_course_module($mod) {
GLOBAL $db;
$timenow = time();
if (!$rs = $db->Execute("INSERT into course_modules
SET course = '$mod->course',
module = '$mod->module',
instance = '$mod->instance',
week = '$mod->week',
added = '$timenow' ")) {
return 0;
}
// Get it out again - this is the most compatible way to determine the ID
if ($rs = $db->Execute("SELECT id FROM course_modules
WHERE module = $mod->module AND added = $timenow")) {
return $rs->fields[0];
} else {
return 0;
}
}
function add_mod_to_week($mod) {
// Returns the course_weeks ID where the mod is inserted
GLOBAL $db;
if ($cw = get_record_sql("SELECT * FROM course_weeks
WHERE course = '$mod->course' AND week = '$mod->week'") ) {
if ($cw->sequence) {
$newsequence = "$cw->sequence,$mod->course_module";
} else {
$newsequence = "$mod->course_module";
}
if (!$rs = $db->Execute("UPDATE course_weeks SET sequence = '$newsequence' WHERE id = '$cw->id'")) {
return 0;
} else {
return $cw->id; // Return course_weeks ID that was used.
}
} else { // Insert a new record
if (!$rs = $db->Execute("INSERT into course_weeks
SET course = '$mod->course',
week = '$mod->week',
summary = '',
sequence = '$mod->course_module' ")) {
return 0;
}
// Get it out again - this is the most compatible way to determine the ID
if ($rs = $db->Execute("SELECT id FROM course_weeks
WHERE course = '$mod->course' AND week = '$mod->week'")) {
return $rs->fields[0];
} else {
return 0;
}
}
}
function delete_course_module($mod) {
return set_field("course_modules", "deleted", 1, "id", $mod);
}
function delete_mod_from_week($mod, $week) {
GLOBAL $db;
if ($cw = get_record("course_weeks", "id", "$week") ) {
$modarray = explode(",", $cw->sequence);
if ($key = array_keys ($modarray, $mod)) {
array_splice($modarray, $key[0], 1);
$newsequence = implode(",", $modarray);
return set_field("course_weeks", "sequence", $newsequence, "id", $cw->id);
} else {
return false;
}
} else {
return false;
}
}
function move_module($id, $move) {
GLOBAL $db;
if (!$move) {
return true;
}
if (! $cm = get_record("course_modules", "id", $id)) {
error("This course module doesn't exist");
}
if (! $thisweek = get_record("course_weeks", "id", $cm->week)) {
error("This course week doesn't exist");
}
$mods = explode(",", $thisweek->sequence);
$len = count($mods);
$pos = array_keys($mods, $cm->id);
$thepos = $pos[0];
if ($len == 0 || count($pos) == 0 ) {
error("Very strange. Could not find the required module in this week.");
}
if ($len == 1) {
$first = true;
$last = true;
} else {
$first = ($thepos == 0);
$last = ($thepos == $len - 1);
}
if ($move < 0) { // Moving the module up
if ($first) {
if ($thisweek->week == 1) { // First week, do nothing
return true;
} else { // Push onto end of previous week
$prevweeknumber = $thisweek->week - 1;
if (! $prevweek = get_record_sql("SELECT * FROM course_weeks
WHERE course='$thisweek->course'
AND week='$prevweeknumber' ")) {
error("Previous week ($prevweek->id) doesn't exist");
}
if ($prevweek->sequence) {
$newsequence = "$prevweek->sequence,$cm->id";
} else {
$newsequence = "$cm->id";
}
if (! set_field("course_weeks", "sequence", $newsequence, "id", $prevweek->id)) {
error("Previous week could not be updated");
}
if (! set_field("course_modules", "week", $prevweek->id, "id", $cm->id)) {
error("Module could not be updated");
}
array_splice($mods, 0, 1);
$newsequence = implode(",", $mods);
if (! set_field("course_weeks", "sequence", $newsequence, "id", $thisweek->id)) {
error("Module could not be updated");
}
return true;
}
} else { // move up within this week
$swap = $mods[$thepos-1];
$mods[$thepos-1] = $mods[$thepos];
$mods[$thepos] = $swap;
$newsequence = implode(",", $mods);
if (! set_field("course_weeks", "sequence", $newsequence, "id", $thisweek->id)) {
error("This week could not be updated");
}
return true;
}
} else { // Moving the module down
if ($last) {
$nextweeknumber = $thisweek->week + 1;
if ($nextweek = get_record_sql("SELECT * FROM course_weeks
WHERE course='$thisweek->course'
AND week='$nextweeknumber' ")) {
if ($nextweek->sequence) {
$newsequence = "$cm->id,$nextweek->sequence";
} else {
$newsequence = "$cm->id";
}
if (! set_field("course_weeks", "sequence", $newsequence, "id", $nextweek->id)) {
error("Next week could not be updated");
}
if (! set_field("course_modules", "week", $nextweek->id, "id", $cm->id)) {
error("Module could not be updated");
}
array_splice($mods, $thepos, 1);
$newsequence = implode(",", $mods);
if (! set_field("course_weeks", "sequence", $newsequence, "id", $thisweek->id)) {
error("This week could not be updated");
}
return true;
} else { // There is no next week, so just return
return true;
}
} else { // move down within this week
$swap = $mods[$thepos+1];
$mods[$thepos+1] = $mods[$thepos];
$mods[$thepos] = $swap;
$newsequence = implode(",", $mods);
if (! set_field("course_weeks", "sequence", $newsequence, "id", $thisweek->id)) {
error("This week could not be updated");
}
return true;
}
}
}
?>
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