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<?php
namespace Model;
/**
* Task Position
*
* @package model
* @author Frederic Guillot
*/
class TaskPosition extends Base
{
/**
* Move a task to another column or to another position
*
* @access public
* @param integer $project_id Project id
* @param integer $task_id Task id
* @param integer $column_id Column id
* @param integer $position Position (must be >= 1)
* @return boolean
*/
public function movePosition($project_id, $task_id, $column_id, $position)
{
$original_task = $this->taskFinder->getById($task_id);
$positions = $this->calculatePositions($project_id, $task_id, $column_id, $position);
if ($positions === false || ! $this->savePositions($positions)) {
return false;
}
$this->fireEvents($original_task, $column_id, $position);
return true;
}
/**
* Calculate the new position of all tasks
*
* @access public
* @param integer $project_id Project id
* @param integer $task_id Task id
* @param integer $column_id Column id
* @param integer $position Position (must be >= 1)
* @return array|boolean
*/
public function calculatePositions($project_id, $task_id, $column_id, $position)
{
// The position can't be lower than 1
if ($position < 1) {
return false;
}
$board = $this->db->table(Board::TABLE)->eq('project_id', $project_id)->asc('position')->findAllByColumn('id');
$columns = array();
// For each column fetch all tasks ordered by position
foreach ($board as $board_column_id) {
$columns[$board_column_id] = $this->db->table(Task::TABLE)
->eq('is_active', 1)
->eq('project_id', $project_id)
->eq('column_id', $board_column_id)
->neq('id', $task_id)
->asc('position')
->findAllByColumn('id');
}
// The column must exists
if (! isset($columns[$column_id])) {
return false;
}
// We put our task to the new position
array_splice($columns[$column_id], $position - 1, 0, $task_id);
return $columns;
}
/**
* Save task positions
*
* @access private
* @param array $columns Sorted tasks
* @return boolean
*/
private function savePositions(array $columns)
{
return $this->db->transaction(function ($db) use ($columns) {
foreach ($columns as $column_id => $column) {
$position = 1;
foreach ($column as $task_id) {
$result = $db->table(Task::TABLE)->eq('id', $task_id)->update(array(
'position' => $position,
'column_id' => $column_id
));
if (! $result) {
return false;
}
$position++;
}
}
});
}
/**
* Fire events
*
* @access public
* @param array $task
* @param integer $new_column_id
* @param integer $new_position
*/
public function fireEvents(array $task, $new_column_id, $new_position)
{
$event_data = array(
'task_id' => $task['id'],
'project_id' => $task['project_id'],
'position' => $new_position,
'column_id' => $new_column_id,
);
if ($task['column_id'] != $new_column_id) {
$this->event->trigger(Task::EVENT_MOVE_COLUMN, $event_data);
}
else if ($task['position'] != $new_position) {
$this->event->trigger(Task::EVENT_MOVE_POSITION, $event_data);
}
}
}
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