<?php

declare(strict_types=1);

namespace Siteworxpro\App\CommandBus;

use League\Tactician\Exception\CanNotInvokeHandlerException;
use League\Tactician\Handler\Locator\HandlerLocator;
use Siteworxpro\App\Attributes\CommandBus\HandlesCommand;

class AttributeLocator implements HandlerLocator
{
    private const string HANDLER_NAMESPACE = 'Siteworxpro\\App\\CommandBus\\Handlers\\';

    private array $handlers;

    public function __construct()
    {
        $directory = __DIR__ . '/Handlers';
        $files = scandir($directory);
        foreach ($files as $file) {
            if (pathinfo($file, PATHINFO_EXTENSION) === 'php') {
                $className = pathinfo($file, PATHINFO_FILENAME);
                $fullClassName = self::HANDLER_NAMESPACE . $className;

                if (class_exists($fullClassName)) {
                    $reflectionClass = new \ReflectionClass($fullClassName);
                    $attributes = $reflectionClass->getAttributes(HandlesCommand::class);

                    foreach ($attributes as $attribute) {
                        $instance = $attribute->newInstance();
                        $commandClass = $instance->commandClass;
                        $this->handlers[$commandClass] = $fullClassName;
                    }
                }
            }
        }
    }

    public function getHandlerForCommand($commandName)
    {
        if (isset($this->handlers[$commandName])) {
            $handlerClass = $this->handlers[$commandName];
            return new $handlerClass();
        }

        throw new CanNotInvokeHandlerException("No handler found for command: " . $commandName);
    }
}