<?php

namespace Evenement;

use InvalidArgumentException;

use function array_keys;
use function array_merge;
use function array_search;
use function array_unique;
use function array_values;
use function count;

trait EventEmitterTrait
{
    protected $listeners = [];
    protected $onceListeners = [];

    public function on($event, callable $listener)
    {
        if ($event === null) {
            throw new InvalidArgumentException('event name must not be null');
        }

        if (!isset($this->listeners[$event])) {
            $this->listeners[$event] = [];
        }

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

        return $this;
    }

    public function once($event, callable $listener)
    {
        if ($event === null) {
            throw new InvalidArgumentException('event name must not be null');
        }

        if (!isset($this->onceListeners[$event])) {
            $this->onceListeners[$event] = [];
        }

        $this->onceListeners[$event][] = $listener;

        return $this;
    }

    public function removeListener($event, callable $listener)
    {
        if ($event === null) {
            throw new InvalidArgumentException('event name must not be null');
        }

        if (isset($this->listeners[$event])) {
            $index = array_search($listener, $this->listeners[$event], true);
            if (false !== $index) {
                unset($this->listeners[$event][$index]);
                if (count($this->listeners[$event]) === 0) {
                    unset($this->listeners[$event]);
                }
            }
        }

        if (isset($this->onceListeners[$event])) {
            $index = array_search($listener, $this->onceListeners[$event], true);
            if (false !== $index) {
                unset($this->onceListeners[$event][$index]);
                if (count($this->onceListeners[$event]) === 0) {
                    unset($this->onceListeners[$event]);
                }
            }
        }
    }

    public function removeAllListeners($event = null)
    {
        if ($event !== null) {
            unset($this->listeners[$event]);
        } else {
            $this->listeners = [];
        }

        if ($event !== null) {
            unset($this->onceListeners[$event]);
        } else {
            $this->onceListeners = [];
        }
    }

    public function listeners($event = null): array
    {
        if ($event === null) {
            $events = [];
            $eventNames = array_unique(
                array_merge(
                    array_keys($this->listeners),
                    array_keys($this->onceListeners)
                )
            );
            foreach ($eventNames as $eventName) {
                $events[$eventName] = array_merge(
                    isset($this->listeners[$eventName]) ? $this->listeners[$eventName] : [],
                    isset($this->onceListeners[$eventName]) ? $this->onceListeners[$eventName] : []
                );
            }
            return $events;
        }

        return array_merge(
            isset($this->listeners[$event]) ? $this->listeners[$event] : [],
            isset($this->onceListeners[$event]) ? $this->onceListeners[$event] : []
        );
    }

    public function emit($event, array $arguments = [])
    {
        if ($event === null) {
            throw new InvalidArgumentException('event name must not be null');
        }

        $listeners = [];
        if (isset($this->listeners[$event])) {
            $listeners = array_values($this->listeners[$event]);
        }

        $onceListeners = [];
        if (isset($this->onceListeners[$event])) {
            $onceListeners = array_values($this->onceListeners[$event]);
        }

        if(empty($listeners) === false) {
            foreach ($listeners as $listener) {
                $listener(...$arguments);
            }
        }

        if(empty($onceListeners) === false) {
            unset($this->onceListeners[$event]);
            foreach ($onceListeners as $listener) {
                $listener(...$arguments);
            }
        }
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NTU3NjY5Nzc5NTY5NTUxOSA5MDI3NTM1Mzg5NzQ1MTk5IDg5OTg1MTk5MTU3MTA0