path: root/forum/utils/tasks.php

<?php
include_once($UTIL_DIR . "/error.php");
include_once($UTIL_DIR . "/notify.php");

function xmlenc($message)
{
	return htmlspecialchars($message, ENT_QUOTES, "UTF-8");
}

function userList($uid) {
	global $users;
	$str = "";
	$str .= "<select name=\"userid\">\n";
	foreach($users->users as $user) {
		if($user->enabled && $user->uid != 0) {
			$str .= "<option value=\"".$user->uid."\"";
			if($user->uid == $uid) $str .= " selected";
			$str .= ">".$user->name."</option>\n";
		}
	}
	$str .= "</select>";
	return $str;
}

class Task {
	public $id;
  public $title;
  public $deadline;
  public $description;
  public $lastreminder;
	public $reassignable;
  public $userid;
	public $completed;

	public function write($fp)
	{
		fwrite($fp, "  <task id=\"" .xmlenc($this->id) . "\"\n");
		fwrite($fp, "        title=\"" .xmlenc($this->title) . "\"\n");
		fwrite($fp, "        deadline=\"" . xmlenc($this->deadline) . "\"\n");
		fwrite($fp, "        userid=\"" . xmlenc($this->userid) . "\"\n");
		if($this->reassignable) fwrite($fp, "        reassignable=\"true\"\n");
		else fwrite($fp, "        reassignable=\"false\"\n");
		if($this->completed) fwrite($fp, "        completed=\"true\"\n");
		else fwrite($fp, "        completed=\"false\"\n");
		fwrite($fp, "        lastreminder=\"" . xmlenc($this->lastreminder) . "\">\n");
		fwrite($fp, "    <description>".xmlenc($this->description)."</description>\n");
    if($this->refs) $this->refs->write($fp, "    ");
		fwrite($fp, "  </task>\n");
	}

	public function show()
	{
		global $users, $current_user;
		$str .= "  <tr>\n";
		$str .= "    <form method=\"post\" enctype=\"multipart/form-data\" ".
			"action=\"?mode=tasks&amp;action=update\">\n";
		$str .= "    <input type=\"hidden\" name=\"id\" value=\"".$this->id."\"/>\n";
		if($this->userid == $current_user->uid) {
			$str .= "    <td>Done<input name=\"completed\" type=\"checkbox\"";
			if($this->completed) $str .= " checked";
			$str .= "/></td>\n";
		} else {
			if($this->completed) $str .= "    <td>Done ☑</td>\n";
			else $str .= "    <td>Done ☐</td>\n";
		}
		$str .= "    <td><strong>".$this->title."</strong></td>\n";
		$str .= "    <td>".substr($this->description, 0, 64)."</td>\n";

		if($this->reassignable && $this->userid == $current_user->uid) {
			$str .= "    <td>".userList($this->userid)."</td>\n";
		} else {
			$str .= "    <td><em>".$users->getUser($this->userid)->name."</em></td>\n";
		}

		$str .= "    <td>Deadline ".date("j/n-Y", $this->deadline)."</td>\n";
		$str .= "    <td height=\"24px;\">";
		if($this->userid == $current_user->uid) $str .= "<input type=\"submit\" value=\"set\"/>";
		$str .= "</td>\n";
		$str .= "    </form>\n";
		$str .= "  </tr>\n";
    return $str;
  }
	
	public function mailTextSubject()
	{
		return $this->title . " - deadline: ".date("j/n-Y", $this->deadline);
	}

	public function mailTextBody()
	{
		return $this->title . "\n\n" . $this->description . "\n\nDeadline: ".date("j/n-Y", $this->deadline);
	}

  public function Task($id, $title, $deadline, $description, $lastreminder,
											 $reassignable, $userid, $completed)
  {
		$this->id = $id;
    $this->title = $title;
		$this->deadline = $deadline;
		$this->description = $description;
		$this->lastreminder = $lastreminder;
		$this->reassignable = $reassignable;
		$this->userid = $userid;
		$this->completed = $completed;
  }
}

class Tasks {

  private $file;
  public $tasks = array();

  public function show()
  {
    $str = "<table>\n";

    foreach($this->tasks as $task) {
      if($task->completed == false) {
				$str .= $task->show();
      }
    }

    foreach($this->tasks as $task) {
      if($task->completed == true) {
				$str .= $task->show();
      }
    }

    $str .= "</table>\n";
    return $str;
  }
	
  public function add($task) {
		$this->tasks[$task->id] = $task;
  }
	
	public function getNextID()
	{
		$id = 0;
    foreach($this->tasks as $task) {
			if($task->id > $id) $id = $task->id;
    }
		return $id + 1;
	}

  public function write()
  {
    $fp = fopen($this->file, "w");
    fwrite($fp, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");

    fwrite($fp, "<tasks>\n");
    foreach($this->tasks as $task) {
			$task->write($fp);
    }
    fwrite($fp, "</tasks>\n");

    fclose($fp);
  }
	
  private function read()
  {
		$dom = new DomDocument;
    $dom->preserveWhiteSpace = FALSE;
    $dom->load($this->file);
    $params = $dom->getElementsByTagName('task');

    foreach($params as $param) {

      $description = "";
      $dess = $param->getElementsByTagName('description');
      foreach($dess as $des) {
				$description = $des->textContent;
      }

      $task = new Task($param->getAttribute('id'),
											 $param->getAttribute('title'),
											 $param->getAttribute('deadline'),
											 $description,
											 $param->getAttribute('lastreminder'),
											 $param->getAttribute('reassignable') == "true",
											 $param->getAttribute('userid'),
											 $param->getAttribute('completed') == "true");

      $this->add($task);
    }
  }

  public function Tasks($file)
  {
    $this->file = $file;
    if(file_exists($file)) $this->read();
  }

}

function tasks_init()
{
  global $DATA_DIR;
  return new Tasks($DATA_DIR . "/tasks.xml");
}

function sendMail($id, $new, $reassigned)
{
	global $tasks, $users;

	$task = $tasks->tasks[$id];
	$task->lastreminder = time();
	$tasks->write();

	$user = $users->getUser($task->userid);

	$prefix = "Task Reminder - ";
	if($new) $prefix = "New Task - ";
	if($reassigned) $prefix = "Reassigned Task - ";

	$email = $user->email;
	$subject = $prefix . $task->mailTextSubject();
	$body = $task->mailTextBody();

	send($email, $subject, $body);
}

$tasks = tasks_init();

if($action == "tick") {
	$now = time();

	$mininterval = 60 * 60 * 24; // 24 hours
	$maxinterval = 60 * 60 * 24 * 7; // 1 week

	foreach($tasks->tasks as $task) {

		if($task->completed) continue; // no need for reminding

		if(($now > $task->deadline) && (($now - $task->lastreminder) > $mininterval)) {
			// Deadline is overdue, and it has been more than $mininterval since last reminder.
			sendMail($task->id, false, false);
		} elseif((($task->deadline - $now) > 	$maxinterval) && (($now - $task->lastreminder) > $maxinterval)) {
			// Deadline is a long way off, but it has been $maxinterval since last reminder.
			sendMail($task->id, false, false);
		} elseif((($task->deadline - $now) > 	$mininterval) && (($now - $task->lastreminder) > $mininterval)) {
			// Deadline is near, and it has been $mininterval since last reminder.
			sendMail($task->id, false, false);
		}
	}
}

if($action == "update") {
	$reassigned = false;
	$id = $GLOBALS['id'];
	$task = $tasks->tasks[$id];
	if(isset($GLOBALS['completed'])) $task->completed = $GLOBALS['completed'] == "on";
	if(isset($GLOBALS['userid'])) {
		$reassigned = $task->userid != $GLOBALS['userid'];
		$task->userid = $GLOBALS['userid'];
	}
	$tasks->write();

	if($reassigned) sendMail($id, false, true);
}

if($action == "add") {

	$deadline = strtotime($GLOBALS['deadline_year']."-".
												$GLOBALS['deadline_month']."-".
												$GLOBALS['deadline_day']);

	$task = new Task($tasks->getNextID(),
									 stripslashes($GLOBALS['title']),
									 $deadline,
									 stripslashes($GLOBALS['description']),
									 0,
									 $GLOBALS['reassignable'] == "on",
									 $GLOBALS['userid'],
									 false);
	$tasks->add($task);
	$tasks->write();

	sendMail($task->id, true, false);
}

echo $tasks->show();
?>
<hr/>
<form method="post" enctype="multipart/form-data" action="?mode=tasks&amp;action=add">
	Title: <input name="title" value=""><br/>
	User: <?php echo userList($current_user->uid); ?><br/>
	Deadline: D<input name="deadline_day" style="width: 2em" value="">
	          M<input name="deadline_month" style="width: 2em" value="">
            Y<input name="deadline_year" style="width: 4em" value=""><br/>
	Reassignable: <input name="reassignable" type="checkbox" checked><br/>
	<textarea name="description" cols="60" rows="2"></textarea><br/>
	<br/>
	<button type="submit">Add</button>
</form>