<?php
declare(strict_types=1);

namespace Phred\Http\Middleware;

use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;

abstract class Middleware implements MiddlewareInterface
{
    /** @var array<string, float> */
    protected static array $timings = [];

    abstract public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface;

    /**
     * Wrap a handler and measure its execution time.
     */
    protected function profile(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        $start = microtime(true);
        try {
            return $handler->handle($request);
        } finally {
            $duration = microtime(true) - $start;
            self::$timings[static::class] = (self::$timings[static::class] ?? 0) + $duration;
        }
    }

    /**
     * Simple profiler for middleware that don't need to wrap the handler.
     */
    protected function profileSelf(callable $callback): mixed
    {
        $start = microtime(true);
        try {
            return $callback();
        } finally {
            $duration = microtime(true) - $start;
            self::$timings[static::class] = (self::$timings[static::class] ?? 0) + $duration;
        }
    }

    /**
     * Get all recorded timings.
     * @return array<string, float>
     */
    public static function getTimings(): array
    {
        return self::$timings;
    }

    protected function json(array $data, int $status = 200): ResponseInterface
    {
        $response = new \Nyholm\Psr7\Response($status, ['Content-Type' => 'application/json']);
        $response->getBody()->write(json_encode($data, JSON_UNESCAPED_SLASHES));
        return $response;
    }
}