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<?php
namespace Kanboard\Analytic;
use Kanboard\Core\Base;
use Kanboard\Model\Task;
/**
* Average Time Spent by Column
*
* @package analytic
* @author Frederic Guillot
*/
class AverageTimeSpentColumnAnalytic extends Base
{
/**
* Build report
*
* @access public
* @param integer $project_id Project id
* @return array
*/
public function build($project_id)
{
$stats = $this->initialize($project_id);
$this->processTasks($stats, $project_id);
$this->calculateAverage($stats);
return $stats;
}
/**
* Initialize default values for each column
*
* @access private
* @param integer $project_id
* @return array
*/
private function initialize($project_id)
{
$stats = array();
$columns = $this->board->getColumnsList($project_id);
foreach ($columns as $column_id => $column_title) {
$stats[$column_id] = array(
'count' => 0,
'time_spent' => 0,
'average' => 0,
'title' => $column_title,
);
}
return $stats;
}
/**
* Calculate time spent for each tasks for each columns
*
* @access private
* @param array $stats
* @param integer $project_id
*/
private function processTasks(array &$stats, $project_id)
{
$tasks = $this->getTasks($project_id);
foreach ($tasks as &$task) {
foreach ($this->getTaskTimeByColumns($task) as $column_id => $time_spent) {
if (isset($stats[$column_id])) {
$stats[$column_id]['count']++;
$stats[$column_id]['time_spent'] += $time_spent;
}
}
}
}
/**
* Calculate averages
*
* @access private
* @param array $stats
*/
private function calculateAverage(array &$stats)
{
foreach ($stats as &$column) {
$this->calculateColumnAverage($column);
}
}
/**
* Calculate column average
*
* @access private
* @param array $column
*/
private function calculateColumnAverage(array &$column)
{
if ($column['count'] > 0) {
$column['average'] = (int) ($column['time_spent'] / $column['count']);
}
}
/**
* Get time spent for each column for a given task
*
* @access private
* @param array $task
* @return array
*/
private function getTaskTimeByColumns(array &$task)
{
$columns = $this->transition->getTimeSpentByTask($task['id']);
if (! isset($columns[$task['column_id']])) {
$columns[$task['column_id']] = 0;
}
$columns[$task['column_id']] += $this->getTaskTimeSpentInCurrentColumn($task);
return $columns;
}
/**
* Calculate time spent of a task in the current column
*
* @access private
* @param array $task
*/
private function getTaskTimeSpentInCurrentColumn(array &$task)
{
$end = $task['date_completed'] ?: time();
return $end - $task['date_moved'];
}
/**
* Fetch the last 1000 tasks
*
* @access private
* @param integer $project_id
* @return array
*/
private function getTasks($project_id)
{
return $this->db
->table(Task::TABLE)
->columns('id', 'date_completed', 'date_moved', 'column_id')
->eq('project_id', $project_id)
->desc('id')
->limit(1000)
->findAll();
}
}
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