<?php

    require_once(dirname(dirname(__FILE__))."/engine/engine.php");

    gatekeeper();
	action_gatekeeper();

    global $Dippler;

	$course_id = (int)get_input('course_id');
	$assignment_id = (int)get_input('assignment_id');
	$title = get_input('assignment_title');
	$start = get_input('assignment_start');
	$deadline = get_input('assignment_deadline');
	$hidden = get_input('assignment_hidden');
	$target_group = get_input('assignment_target_group');
	$task = get_input('assignment_task');
	$tags = get_input('assignment_tags');

	// Cache variables
	$input_values = array();
	$input_values['assignment_title'] = $title;
	$input_values['assignment_start'] = $start;
	$input_values['assignment_deadline'] = $deadline;
	$input_values['assignment_hidden'] = $hidden;
	$input_values['assignment_target_group'] = $target_group;
    $input_values['assignment_task'] = $task;
    $input_values['assignment_tags'] = $tags;
    $_SESSION['input_values'] = $input_values;

	if (empty($title) || empty($start) || empty($deadline)) {
		$Dippler->add_system_message(_("At least one of the parameters is empty."), 'error');
		forward("course/assignments/{$course_id}/assignment/{$assignment_id}/edit");
	} else if (empty($assignment_id)) {
	    $Dippler->add_system_message(_("Assignment not found."), 'error');
		forward("course/assignments/{$course_id}");
	} else if (empty($course_id)) {
	    $Dippler->add_system_message(_("Course not found."), 'error');
		forward('courses/my');
	} else {
		$assignment = new Assignment($assignment_id);
		$assignment->load();
			if ($assignment && $assignment->getType() == 'assignment') {
          		if ($assignment->canEdit()) {
            		$assignment->title = $title;
            		//$assignment->assignment_type = "writing";
            		$assignment->start = date_into_timestamp($start);
            		$assignment->deadline = date_into_timestamp($deadline);
            		if ($hidden) {
            			$assignment->hidden = "true";
            		} else {
            			$assignment->hidden = "false";
            		}
            		if (isset($target_group) && !empty($target_group)) {
            		    if (!is_array($target_group)) $target_group = array($target_group);
            		} else {
            		    $target_group = array();
            		}
            		$assignment->target_group = $target_group;
            	    $assignment->description = $task;
            	    if (isset($tags)) {
            		    $assignment->tags = explode(",", $tags);
            		}
            		if (!$assignment->save()) {
            		    $Dippler->add_system_message(_("Assignment could not be edited."), 'error');
            			forward("course/assignments/{$course_id}/assignment/{$assignment_id}/edit");
            		}
          		} else {
      		        $Dippler->add_system_message(_("At least one of the parameters is empty."), 'error');
      		        forward("course/assignments/{$course_id}/assignment/{$assignment_id}/edit");
      		    }
      		} else {
      		    $Dippler->add_system_message(_("Assignment could not be edited."), 'error');
		}

		$Dippler->add_system_message(_("Assignment edited."));

		// Clear cache
        $Dippler->clearSessionInputValues();
		forward("course/assignments/{$course_id}/assignment/{$assignment_id}");
	}

	forward('courses/my');
?>