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<?php
namespace Kanboard\Analytic;
use Kanboard\Core\Base;
use Kanboard\Model\Task;
/**
* Average Lead and Cycle Time
*
* @package analytic
* @author Frederic Guillot
*/
class AverageLeadCycleTimeAnalytic extends Base
{
/**
* Build report
*
* @access public
* @param integer $project_id Project id
* @return array
*/
public function build($project_id)
{
$stats = array(
'count' => 0,
'total_lead_time' => 0,
'total_cycle_time' => 0,
'avg_lead_time' => 0,
'avg_cycle_time' => 0,
);
$tasks = $this->getTasks($project_id);
foreach ($tasks as &$task) {
$stats['count']++;
$stats['total_lead_time'] += $this->calculateLeadTime($task);
$stats['total_cycle_time'] += $this->calculateCycleTime($task);
}
$stats['avg_lead_time'] = $this->calculateAverage($stats, 'total_lead_time');
$stats['avg_cycle_time'] = $this->calculateAverage($stats, 'total_cycle_time');
return $stats;
}
/**
* Calculate average
*
* @access private
* @param array &$stats
* @param string $field
* @return float
*/
private function calculateAverage(array &$stats, $field)
{
if ($stats['count'] > 0) {
return (int) ($stats[$field] / $stats['count']);
}
return 0;
}
/**
* Calculate lead time
*
* @access private
* @param array &$task
* @return integer
*/
private function calculateLeadTime(array &$task)
{
$end = $task['date_completed'] ?: time();
$start = $task['date_creation'];
return $end - $start;
}
/**
* Calculate cycle time
*
* @access private
* @param array &$task
* @return integer
*/
private function calculateCycleTime(array &$task)
{
$end = (int) $task['date_completed'] ?: time();
$start = (int) $task['date_started'];
// Start date can be in the future when defined with the Gantt chart
if ($start > 0 && $end > $start) {
return $end - $start;
}
return 0;
}
/**
* Get the 1000 last created tasks
*
* @access private
* @param integer $project_id
* @return array
*/
private function getTasks($project_id)
{
return $this->db
->table(Task::TABLE)
->columns('date_completed', 'date_creation', 'date_started')
->eq('project_id', $project_id)
->desc('id')
->limit(1000)
->findAll();
}
}
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