<?php

namespace League\Event;

use InvalidArgumentException;

class Emitter implements EmitterInterface
{
    /**
     * The registered listeners.
     *
     * @var array
     */
    protected $listeners = [];

    /**
     * The sorted listeners
     *
     * Listeners will get sorted and stored for re-use.
     *
     * @var ListenerInterface[]
     */
    protected $sortedListeners = [];

    /**
     * @inheritdoc
     */
    public function addListener($event, $listener, $priority = self::P_NORMAL)
    {
        $listener = $this->ensureListener($listener);
        $this->listeners[$event][$priority][] = $listener;
        $this->clearSortedListeners($event);

        return $this;
    }

    /**
     * @inheritdoc
     */
    public function addOneTimeListener($event, $listener, $priority = self::P_NORMAL)
    {
        $listener = $this->ensureListener($listener);
        $listener = new OneTimeListener($listener);

        return $this->addListener($event, $listener, $priority);
    }

    /**
     * @inheritdoc
     */
    public function useListenerProvider(ListenerProviderInterface $provider)
    {
        $acceptor = new ListenerAcceptor($this);
        $provider->provideListeners($acceptor);

        return $this;
    }

    /**
     * @inheritdoc
     */
    public function removeListener($event, $listener)
    {
        $this->clearSortedListeners($event);
        $listeners = $this->hasListeners($event)
            ? $this->listeners[$event]
            : [];

        $filter = function ($registered) use ($listener) {
            return ! $registered->isListener($listener);
        };

        foreach ($listeners as $priority => $collection) {
            $listeners[$priority] = array_filter($collection, $filter);
        }

        $this->listeners[$event] = $listeners;


        return $this;
    }

    /**
     * @inheritdoc
     */
    public function removeAllListeners($event)
    {
        $this->clearSortedListeners($event);

        if ($this->hasListeners($event)) {
            unset($this->listeners[$event]);
        }

        return $this;
    }

    /**
     * Ensure the input is a listener.
     *
     * @param ListenerInterface|callable $listener
     *
     * @throws InvalidArgumentException
     *
     * @return ListenerInterface
     */
    protected function ensureListener($listener)
    {
        if ($listener instanceof ListenerInterface) {
            return $listener;
        }

        if (is_callable($listener)) {
            return CallbackListener::fromCallable($listener);
        }

        throw new InvalidArgumentException('Listeners should be ListenerInterface, Closure or callable. Received type: '.gettype($listener));
    }

    /**
     * @inheritdoc
     */
    public function hasListeners($event)
    {
        if (! isset($this->listeners[$event]) || count($this->listeners[$event]) === 0) {
            return false;
        }

        return true;
    }

    /**
     * @inheritdoc
     */
    public function getListeners($event)
    {
        if (array_key_exists($event, $this->sortedListeners)) {
            return $this->sortedListeners[$event];
        }

        return $this->sortedListeners[$event] = $this->getSortedListeners($event);
    }

    /**
     * Get the listeners sorted by priority for a given event.
     *
     * @param string $event
     *
     * @return ListenerInterface[]
     */
    protected function getSortedListeners($event)
    {
        if (! $this->hasListeners($event)) {
            return [];
        }

        $listeners = $this->listeners[$event];
        krsort($listeners);

        return call_user_func_array('array_merge', $listeners);
    }

    /**
     * @inheritdoc
     */
    public function emit($event)
    {
        list($name, $event) = $this->prepareEvent($event);
        $arguments = [$event] + func_get_args();
        $this->invokeListeners($name, $event, $arguments);
        $this->invokeListeners('*', $event, $arguments);

        return $event;
    }

    /**
     * @inheritdoc
     */
    public function emitBatch(array $events)
    {
        $results = [];

        foreach ($events as $event) {
            $results[] = $this->emit($event);
        }

        return $results;
    }

    /**
     * @inheritdoc
     */
    public function emitGeneratedEvents(GeneratorInterface $generator)
    {
        $events = $generator->releaseEvents();

        return $this->emitBatch($events);
    }

    /**
     * Invoke the listeners for an event.
     *
     * @param string         $name
     * @param EventInterface $event
     * @param array          $arguments
     *
     * @return void
     */
    protected function invokeListeners($name, EventInterface $event, array $arguments)
    {
        $listeners = $this->getListeners($name);

        foreach ($listeners as $listener) {
            if ($event->isPropagationStopped()) {
                break;
            }

            call_user_func_array([$listener, 'handle'], $arguments);
        }
    }

    /**
     * Prepare an event for emitting.
     *
     * @param string|EventInterface $event
     *
     * @return array
     */
    protected function prepareEvent($event)
    {
        $event = $this->ensureEvent($event);
        $name = $event->getName();
        $event->setEmitter($this);

        return [$name, $event];
    }

    /**
     * Ensure event input is of type EventInterface or convert it.
     *
     * @param string|EventInterface $event
     *
     * @throws InvalidArgumentException
     *
     * @return EventInterface
     */
    protected function ensureEvent($event)
    {
        if (is_string($event)) {
            return Event::named($event);
        }

        if (! $event instanceof EventInterface) {
            throw new InvalidArgumentException('Events should be provides as Event instances or string, received type: '.gettype($event));
        }

        return $event;
    }

    /**
     * Clear the sorted listeners for an event
     *
     * @param $event
     */
    protected function clearSortedListeners($event)
    {
        unset($this->sortedListeners[$event]);
    }
}

• [F] AbstractEvent.php
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• [F] AbstractListener.php
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• [F] BufferedEmitter.php
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• [F] CallbackListener.php
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• [F] Emitter.php
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• [F] EmitterAwareInterface.php
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• [F] EmitterAwareTrait.php
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• [F] EmitterInterface.php
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• [F] EmitterTrait.php
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• [F] Event.php
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• [F] EventInterface.php
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• [F] Generator.php
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• [F] GeneratorInterface.php
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• [F] GeneratorTrait.php
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• [F] ListenerAcceptor.php
  Delete
• [F] ListenerAcceptorInterface.php
  Delete
• [F] ListenerInterface.php
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• [F] ListenerProviderInterface.php
  Delete
• [F] OneTimeListener.php
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About Section

About NFC Pay: Our Story and Mission

NFC Pay was founded with a vision to transform the way people handle transactions. Our journey is defined by a commitment to innovation, security, and convenience. We strive to deliver seamless, user-friendly payment solutions that make everyday transactions effortless and secure. Our mission is to empower you to pay with ease and confidence, anytime, anywhere.

• Simplifying Payments, One Tap at a Time.
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FAQ Section

Frequently Asked Questions About NFC Pay

Here are answers to some common questions about NFC Pay. We aim to provide clear and concise information to help you understand how our platform works and how it can benefit you. If you have any further inquiries, please don’t hesitate to contact our support team.

How do I register for NFC Pay?

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Is my payment information secure?

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Can I add multiple cards to my NFC Pay wallet?

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How do I transfer money to another user?

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Sign up for a merchant account through the app and follow the setup instructions to start accepting payments.

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