<?php

declare(strict_types=1);

namespace Lightscale\Router;

use InvalidArgumentException;
use Lightscale\Router\Contracts\Middleware;
use Lightscale\Router\Contracts\Strategy;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;

abstract class AbstractStrategy implements Strategy
{
    /**
     * @param Middleware[] $middlewares
     * @param callable(RequestInterface): ResponseInterface $handler
     */
    public function runMiddleware(
        RequestInterface $request,
        array $middlewares,
        callable $handler,
    ): ResponseInterface {
        $handler = count($middlewares) > 0 ? array_reduce(
            array_reverse($middlewares),
            fn (callable $handler, Middleware $middleware) => fn (ServerRequestInterface $request) => $middleware->handle($request, $handler),
            $handler
        ) : $handler;

        return $handler($request);
    }

    public function parseParameters(array $parameters): array
    {
        foreach ($parameters as $key => $value) {
            if (!is_string($value)) {
                throw new InvalidArgumentException(
                    "Parameter {$key} is not a string."
                );
            }
        }

        return $parameters;
    }
}