<?php namespace Illuminate\Queue\Jobs;

use DateTime;

abstract class Job {

	/**
	 * The job handler instance.
	 *
	 * @var mixed
	 */
	protected $instance;

	/**
	 * The IoC container instance.
	 *
	 * @var \Illuminate\Container\Container
	 */
	protected $container;

	/**
	 * The name of the queue the job belongs to.
	 *
	 * @var string
	 */
	protected $queue;

	/**
	 * Indicates if the job has been deleted.
	 *
	 * @var bool
	 */
	protected $deleted = false;

	/**
	 * Fire the job.
	 *
	 * @return void
	 */
	abstract public function fire();

	/**
	 * Delete the job from the queue.
	 *
	 * @return void
	 */
	public function delete()
	{
		$this->deleted = true;
	}

	/**
	 * Determine if the job has been deleted.
	 *
	 * @return bool
	 */
	public function isDeleted()
	{
		return $this->deleted;
	}

	/**
	 * Release the job back into the queue.
	 *
	 * @param  int   $delay
	 * @return void
	 */
	abstract public function release($delay = 0);

	/**
	 * Get the number of times the job has been attempted.
	 *
	 * @return int
	 */
	abstract public function attempts();

	/**
	 * Get the raw body string for the job.
	 *
	 * @return string
	 */
	abstract public function getRawBody();

	/**
	 * Resolve and fire the job handler method.
	 *
	 * @param  array  $payload
	 * @return void
	 */
	protected function resolveAndFire(array $payload)
	{
		list($class, $method) = $this->parseJob($payload['job']);

		$this->instance = $this->resolve($class);

		$this->instance->{$method}($this, $payload['data']);
	}

	/**
	 * Resolve the given job handler.
	 *
	 * @param  string  $class
	 * @return mixed
	 */
	protected function resolve($class)
	{
		return $this->container->make($class);
	}

	/**
	 * Parse the job declaration into class and method.
	 *
	 * @param  string  $job
	 * @return array
	 */
	protected function parseJob($job)
	{
		$segments = explode('@', $job);

		return count($segments) > 1 ? $segments : array($segments[0], 'fire');
	}

	/**
	 * Determine if job should be auto-deleted.
	 *
	 * @return bool
	 */
	public function autoDelete()
	{
		return isset($this->instance->delete);
	}

	/**
	 * Calculate the number of seconds with the given delay.
	 *
	 * @param  \DateTime|int  $delay
	 * @return int
	 */
	protected function getSeconds($delay)
	{
		if ($delay instanceof DateTime)
		{
			return max(0, $delay->getTimestamp() - $this->getTime());
		}

		return (int) $delay;
	}

	/**
	 * Get the current system time.
	 *
	 * @return int
	 */
	protected function getTime()
	{
		return time();
	}

	/**
	 * Get the name of the queued job class.
	 *
	 * @return string
	 */
	public function getName()
	{
		return json_decode($this->getRawBody(), true)['job'];
	}

	/**
	 * Get the name of the queue the job belongs to.
	 *
	 * @return string
	 */
	public function getQueue()
	{
		return $this->queue;
	}

}