<?php

/*
 * Copyright 2012 Johannes M. Schmitt <schmittjoh@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace PhpOption;

use Traversable;

/**
 * @template T
 *
 * @extends Option<T>
 */
final class LazyOption extends Option
{
    /** @var callable(mixed...):(Option<T>) */
    private $callback;

    /** @var array<int, mixed> */
    private $arguments;

    /** @var Option<T>|null */
    private $option;

    /**
     * @template S
     * @param callable(mixed...):(Option<S>) $callback
     * @param array<int, mixed>              $arguments
     *
     * @return LazyOption<S>
     */
    public static function create($callback, array $arguments = []): self
    {
        return new self($callback, $arguments);
    }

    /**
     * @param callable(mixed...):(Option<T>) $callback
     * @param array<int, mixed>              $arguments
     */
    public function __construct($callback, array $arguments = [])
    {
        if (!is_callable($callback)) {
            throw new \InvalidArgumentException('Invalid callback given');
        }

        $this->callback = $callback;
        $this->arguments = $arguments;
    }

    public function isDefined(): bool
    {
        return $this->option()->isDefined();
    }

    public function isEmpty(): bool
    {
        return $this->option()->isEmpty();
    }

    public function get()
    {
        return $this->option()->get();
    }

    public function getOrElse($default)
    {
        return $this->option()->getOrElse($default);
    }

    public function getOrCall($callable)
    {
        return $this->option()->getOrCall($callable);
    }

    public function getOrThrow(\Exception $ex)
    {
        return $this->option()->getOrThrow($ex);
    }

    public function orElse(Option $else)
    {
        return $this->option()->orElse($else);
    }

    public function ifDefined($callable)
    {
        $this->option()->forAll($callable);
    }

    public function forAll($callable)
    {
        return $this->option()->forAll($callable);
    }

    public function map($callable)
    {
        return $this->option()->map($callable);
    }

    public function flatMap($callable)
    {
        return $this->option()->flatMap($callable);
    }

    public function filter($callable)
    {
        return $this->option()->filter($callable);
    }

    public function filterNot($callable)
    {
        return $this->option()->filterNot($callable);
    }

    public function select($value)
    {
        return $this->option()->select($value);
    }

    public function reject($value)
    {
        return $this->option()->reject($value);
    }

    /**
     * @return Traversable<T>
     */
    public function getIterator(): Traversable
    {
        return $this->option()->getIterator();
    }

    public function foldLeft($initialValue, $callable)
    {
        return $this->option()->foldLeft($initialValue, $callable);
    }

    public function foldRight($initialValue, $callable)
    {
        return $this->option()->foldRight($initialValue, $callable);
    }

    /**
     * @return Option<T>
     */
    private function option(): Option
    {
        if (null === $this->option) {
            /** @var mixed */
            $option = call_user_func_array($this->callback, $this->arguments);
            if ($option instanceof Option) {
                $this->option = $option;
            } else {
                throw new \RuntimeException(sprintf('Expected instance of %s', Option::class));
            }
        }

        return $this->option;
    }
}

• [F] LazyOption.php
  Delete
• [F] None.php
  Delete
• [F] Option.php
  Delete
• [F] Some.php
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                        Request Example (guzzle)
                        

                        
                            
<?php
                            
 require_once('vendor/autoload.php');
                            
 $client = new \GuzzleHttp\Client();
                            
 $response = $client->request('POST', $base_url. 'v1/generate-token', [
                            
'headers' => [
                            
  'accept' => 'application/json',
                            
  'content-type' => 'application/json',
                            
 ],
                            
'form_params' => [
                            
  'client_id'     => '$client_id',
                            
  'secret_id'     => 'secret_id',
                            
  'env'           => 'env',
                            
  'merchant_id'   => 'merchant_id',
                            
 ],
                            
                            
]);
                            
echo $response->getBody();
                        
                    
                

                    
                        
**Response: SUCCESS (200 OK)**
                        
{
                        
 "message": {
                        
 "success": [
                        
  "Successfully token is generated"
                        
 ]
                        
},
                        
"data": {
                        
 "token":"eyJpdiI6InpkczhjTjhQdVhUL2lKQ0pSUUx6aUE9P
SIsInZhbHVlIjoiVGVBTVBDTXltbjNZcEIvdEJveGpTSno3TU5NRUtn
VkhCZ1pHTFNCUnZGQ2UxMnYxN202cEE1YVRDTEFsc0ZERExoTjdtL0dTL2x
oU3QzeUJJOExiMUx5T0w1L0llUXhTUkU1cWVLWEdEbEplb0dKNXcwbTNRM0
VxdkUwYzZuNFdtNkhMQ0pRZysyNWkvdzBxSlBoSVBSOGFTekNnR2RXNHVtc
G9lMGZOTmNCcm1hR3c5Sk9KTnB4Y3ltZDl6cm90MThrR21Ca3B1azc3bXRi
Q0J6SW96UVo1elNkU1ZqeE05bTcwWGp1MEUxWlJFdnNWTmpSbnVpeW92b2U
4dXZkUGgyb1VmK0luaGdyaFlsVTZlcVpVRnZlTG1DeFF6Ykk2T2h6Z3Jzbn
IyNHpNdHowSE5JdDR0Y0pZT20zUm1XYW8iLCJtYWMiOiJlY2M4NGE1OGUzYz
kzYzk0YzljNmVmNjE0YWI0ZDIwOGI3NDQ2YWEyY2ZhNzc0NzE4ZmY1ZmYyMz

                        IyZmQzNDY1IiwidGFnIjoiIn0=",
                        
},
                        
"type": "success"
                        
}
                    
                

                    
                        
**Response: ERROR (400 FAILED)**
                        
{
                        
 "message": {
                        
 "error": [
                        
  "Invalid credentials."
                        
 ]
                        
},
                        
"data": null,
                        
"type": "error"
                        
}