<?php

namespace TFGraphics\SmartImport\Core;

class EventDispatcher
{
    private array $listeners = [];

    public function listen(string $eventName, callable $listener): void
    {
        $this->listeners[$eventName][] = $listener;
    }

    public function dispatch(string $eventName, mixed $payload = null): void
    {
        if (! $this->hasListeners($eventName)) {
            return;
        }

        foreach ($this->listeners[$eventName] as $listener) {
            $listener($payload);
        }
    }

    public function remove(string $eventName, callable $listener): void
    {
        if (! $this->hasListeners($eventName)) {
            return;
        }

        $this->listeners[$eventName] = array_filter(
            $this->listeners[$eventName],
            static fn (callable $existing) => $existing !== $listener
        );
    }

    public function hasListeners(string $eventName): bool
    {
        return ! empty($this->listeners[$eventName]);
    }
}