$calculator = zenpipe()
   ->pipe(fn($price, $next) => $next($price * 0.8)) // 20% discount  
   ->pipe(fn($price, $next) => $next($price * 1.1)); // add 10% tax

$calculator(100); // $88 (100 -> 80 -> 88)

zenpipe(100)
   ->pipe(fn($price, $next) => $next($price * 0.8)) // 20% discount  
   ->pipe(fn($price, $next) => $next($price * 1.1)) // add 10% tax
   ->process(); // 88

$pipeline = zenpipe()
   ->pipe(fn($input, $next) => $next(strtoupper($input)));

class MyClass
{
    public function uppercase($input)
    {
        return strtoupper($input);
    }
}

$pipeline = zenpipe()
   ->pipe([MyClass::class, 'uppercase']);

$pipeline = zenpipe()
   ->pipe([
        fn($input, $next) => $next(strtoupper($input)),
        [MyClass::class, 'uppercase']
    ]);

$ragPipeline = zenpipe()
    ->pipe(fn($query, $next) => $next([
        'query' => $query,
        'embeddings' => OpenAI::embeddings()->create([
            'model' => 'text-embedding-3-small',
            'input' => $query
        ])->embeddings[0]->embedding
    ]))
    ->pipe(fn($data, $next) => $next([
        ...$data,
        'context' => Qdrant::collection('knowledge-base')
            ->search($data['embeddings'], limit: 3)
            ->map(fn($doc) => $doc->content)
            ->join("\n")
    ]))
    ->pipe(fn($data, $next) => $next(
        OpenAI::chat()->create([
            'model' => 'gpt-4-turbo-preview',
            'messages' => [
                [
                    'role' => 'system',
                    'content' => 'Answer using the provided context only.'
                ],
                [
                    'role' => 'user',
                    'content' => "Context: {$data['context']}\n\nQuery: {$data['query']}"
                ]
            ]
        ])->choices[0]->message->content
    ));

$answer = $ragPipeline("What's our refund policy?");

   $emailValidationPipeline = zenpipe()
    ->pipe(function($input, $next) {
        return $next(filter_var($input, FILTER_VALIDATE_EMAIL));
    })
    ->pipe(function($email, $next) {

        if (!$email) {
            return false;
        }
        
        $domain = substr(strrchr($email, "@"), 1);
        $mxhosts = [];
        $mxweight = [];
        
        if (getmxrr($domain, $mxhosts, $mxweight)) {
            return $next(true);
        }
        
        // If MX records don't exist, check for A record as a fallback
        return $next(checkdnsrr($domain, 'A'));
    });


$result = $emailValidationPipeline('example@example.com');