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<?php

namespace Illuminate\Bus;

use Closure;
use Illuminate\Bus\Events\BatchDispatched;
use Illuminate\Contracts\Container\Container;
use Illuminate\Contracts\Events\Dispatcher as EventDispatcher;
use Illuminate\Support\Arr;
use Illuminate\Support\Collection;
use Laravel\SerializableClosure\SerializableClosure;
use Throwable;

class PendingBatch
{
    /**
     * The IoC container instance.
     *
     * @var \Illuminate\Contracts\Container\Container
     */
    protected $container;

    /**
     * The batch name.
     *
     * @var string
     */
    public $name = '';

    /**
     * The jobs that belong to the batch.
     *
     * @var \Illuminate\Support\Collection
     */
    public $jobs;

    /**
     * The batch options.
     *
     * @var array
     */
    public $options = [];

    /**
     * Create a new pending batch instance.
     *
     * @param  \Illuminate\Contracts\Container\Container  $container
     * @param  \Illuminate\Support\Collection  $jobs
     * @return void
     */
    public function __construct(Container $container, Collection $jobs)
    {
        $this->container = $container;
        $this->jobs = $jobs;
    }

    /**
     * Add jobs to the batch.
     *
     * @param  iterable|object|array  $jobs
     * @return $this
     */
    public function add($jobs)
    {
        $jobs = is_iterable($jobs) ? $jobs : Arr::wrap($jobs);

        foreach ($jobs as $job) {
            $this->jobs->push($job);
        }

        return $this;
    }

    /**
     * Add a callback to be executed after all jobs in the batch have executed successfully.
     *
     * @param  callable  $callback
     * @return $this
     */
    public function then($callback)
    {
        $this->options['then'][] = $callback instanceof Closure
                        ? new SerializableClosure($callback)
                        : $callback;

        return $this;
    }

    /**
     * Get the "then" callbacks that have been registered with the pending batch.
     *
     * @return array
     */
    public function thenCallbacks()
    {
        return $this->options['then'] ?? [];
    }

    /**
     * Add a callback to be executed after the first failing job in the batch.
     *
     * @param  callable  $callback
     * @return $this
     */
    public function catch($callback)
    {
        $this->options['catch'][] = $callback instanceof Closure
                    ? new SerializableClosure($callback)
                    : $callback;

        return $this;
    }

    /**
     * Get the "catch" callbacks that have been registered with the pending batch.
     *
     * @return array
     */
    public function catchCallbacks()
    {
        return $this->options['catch'] ?? [];
    }

    /**
     * Add a callback to be executed after the batch has finished executing.
     *
     * @param  callable  $callback
     * @return $this
     */
    public function finally($callback)
    {
        $this->options['finally'][] = $callback instanceof Closure
                    ? new SerializableClosure($callback)
                    : $callback;

        return $this;
    }

    /**
     * Get the "finally" callbacks that have been registered with the pending batch.
     *
     * @return array
     */
    public function finallyCallbacks()
    {
        return $this->options['finally'] ?? [];
    }

    /**
     * Indicate that the batch should not be cancelled when a job within the batch fails.
     *
     * @param  bool  $allowFailures
     * @return $this
     */
    public function allowFailures($allowFailures = true)
    {
        $this->options['allowFailures'] = $allowFailures;

        return $this;
    }

    /**
     * Determine if the pending batch allows jobs to fail without cancelling the batch.
     *
     * @return bool
     */
    public function allowsFailures()
    {
        return Arr::get($this->options, 'allowFailures', false) === true;
    }

    /**
     * Set the name for the batch.
     *
     * @param  string  $name
     * @return $this
     */
    public function name(string $name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Specify the queue connection that the batched jobs should run on.
     *
     * @param  string  $connection
     * @return $this
     */
    public function onConnection(string $connection)
    {
        $this->options['connection'] = $connection;

        return $this;
    }

    /**
     * Get the connection used by the pending batch.
     *
     * @return string|null
     */
    public function connection()
    {
        return $this->options['connection'] ?? null;
    }

    /**
     * Specify the queue that the batched jobs should run on.
     *
     * @param  string  $queue
     * @return $this
     */
    public function onQueue(string $queue)
    {
        $this->options['queue'] = $queue;

        return $this;
    }

    /**
     * Get the queue used by the pending batch.
     *
     * @return string|null
     */
    public function queue()
    {
        return $this->options['queue'] ?? null;
    }

    /**
     * Add additional data into the batch's options array.
     *
     * @param  string  $key
     * @param  mixed  $value
     * @return $this
     */
    public function withOption(string $key, $value)
    {
        $this->options[$key] = $value;

        return $this;
    }

    /**
     * Dispatch the batch.
     *
     * @return \Illuminate\Bus\Batch
     *
     * @throws \Throwable
     */
    public function dispatch()
    {
        $repository = $this->container->make(BatchRepository::class);

        try {
            $batch = $repository->store($this);

            $batch = $batch->add($this->jobs);
        } catch (Throwable $e) {
            if (isset($batch)) {
                $repository->delete($batch->id);
            }

            throw $e;
        }

        $this->container->make(EventDispatcher::class)->dispatch(
            new BatchDispatched($batch)
        );

        return $batch;
    }

    /**
     * Dispatch the batch after the response is sent to the browser.
     *
     * @return \Illuminate\Bus\Batch
     */
    public function dispatchAfterResponse()
    {
        $repository = $this->container->make(BatchRepository::class);

        $batch = $repository->store($this);

        if ($batch) {
            $this->container->terminating(function () use ($batch) {
                $this->dispatchExistingBatch($batch);
            });
        }

        return $batch;
    }

    /**
     * Dispatch an existing batch.
     *
     * @param  \Illuminate\Bus\Batch  $batch
     * @return void
     *
     * @throws \Throwable
     */
    protected function dispatchExistingBatch($batch)
    {
        try {
            $batch = $batch->add($this->jobs);
        } catch (Throwable $e) {
            if (isset($batch)) {
                $batch->delete();
            }

            throw $e;
        }

        $this->container->make(EventDispatcher::class)->dispatch(
            new BatchDispatched($batch)
        );
    }
}