<?php

namespace Kanboard\Model;

use Kanboard\Event\TaskEvent;

/**
 * Task Status
 *
 * @package  model
 * @author   Frederic Guillot
 */
class TaskStatus extends Base
{
    /**
     * Return true if the task is closed
     *
     * @access public
     * @param  integer    $task_id     Task id
     * @return boolean
     */
    public function isClosed($task_id)
    {
        return $this->checkStatus($task_id, Task::STATUS_CLOSED);
    }

    /**
     * Return true if the task is open
     *
     * @access public
     * @param  integer    $task_id     Task id
     * @return boolean
     */
    public function isOpen($task_id)
    {
        return $this->checkStatus($task_id, Task::STATUS_OPEN);
    }

    /**
     * Mark a task closed
     *
     * @access public
     * @param  integer   $task_id   Task id
     * @return boolean
     */
    public function close($task_id)
    {
        $this->subtask->closeAll($task_id);
        return $this->changeStatus($task_id, Task::STATUS_CLOSED, time(), Task::EVENT_CLOSE);
    }

    /**
     * Mark a task open
     *
     * @access public
     * @param  integer   $task_id   Task id
     * @return boolean
     */
    public function open($task_id)
    {
        return $this->changeStatus($task_id, Task::STATUS_OPEN, 0, Task::EVENT_OPEN);
    }

    /**
     * Close multiple tasks
     *
     * @access public
     * @param  array   $task_ids
     */
    public function closeMultipleTasks(array $task_ids)
    {
        foreach ($task_ids as $task_id) {
            $this->close($task_id);
        }
    }

    /**
     * Close all tasks within a column/swimlane
     *
     * @access public
     * @param  integer $swimlane_id
     * @param  integer $column_id
     */
    public function closeTasksBySwimlaneAndColumn($swimlane_id, $column_id)
    {
        $task_ids = $this->db->table(Task::TABLE)->eq('swimlane_id', $swimlane_id)->eq('column_id', $column_id)->findAllByColumn('id');
        $this->closeMultipleTasks($task_ids);
    }

    /**
     * Common method to change the status of task
     *
     * @access private
     * @param  integer   $task_id             Task id
     * @param  integer   $status              Task status
     * @param  integer   $date_completed      Timestamp
     * @param  string    $event               Event name
     * @return boolean
     */
    private function changeStatus($task_id, $status, $date_completed, $event)
    {
        if (! $this->taskFinder->exists($task_id)) {
            return false;
        }

        $result = $this->db
                        ->table(Task::TABLE)
                        ->eq('id', $task_id)
                        ->update(array(
                            'is_active' => $status,
                            'date_completed' => $date_completed,
                            'date_modification' => time(),
                        ));

        if ($result) {
            $this->logger->debug('Event fired: '.$event);
            $this->dispatcher->dispatch($event, new TaskEvent(array('task_id' => $task_id) + $this->taskFinder->getById($task_id)));
        }

        return $result;
    }

    /**
     * Check the status of a task
     *
     * @access private
     * @param  integer   $task_id   Task id
     * @param  integer   $status    Task status
     * @return boolean
     */
    private function checkStatus($task_id, $status)
    {
        return $this->db
                    ->table(Task::TABLE)
                    ->eq('id', $task_id)
                    ->eq('is_active', $status)
                    ->count() === 1;
    }
}