<?php

/**
 * This file is part of the ramsey/collection library
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
 * @license http://opensource.org/licenses/MIT MIT
 */

declare(strict_types=1);

namespace Ramsey\Collection;

use Ramsey\Collection\Exception\InvalidArgumentException;
use Ramsey\Collection\Exception\NoSuchElementException;

/**
 * This class provides a basic implementation of `DoubleEndedQueueInterface`, to
 * minimize the effort required to implement this interface.
 *
 * @template T
 * @extends Queue<T>
 * @implements DoubleEndedQueueInterface<T>
 */
class DoubleEndedQueue extends Queue implements DoubleEndedQueueInterface
{
    /**
     * Index of the last element in the queue.
     */
    private int $tail = -1;

    /**
     * @inheritDoc
     */
    public function offsetSet($offset, $value): void
    {
        if ($this->checkType($this->getType(), $value) === false) {
            throw new InvalidArgumentException(
                'Value must be of type ' . $this->getType() . '; value is '
                . $this->toolValueToString($value),
            );
        }

        $this->tail++;

        $this->data[$this->tail] = $value;
    }

    /**
     * @throws InvalidArgumentException if $element is of the wrong type
     *
     * @inheritDoc
     */
    public function addFirst($element): bool
    {
        if ($this->checkType($this->getType(), $element) === false) {
            throw new InvalidArgumentException(
                'Value must be of type ' . $this->getType() . '; value is '
                . $this->toolValueToString($element),
            );
        }

        $this->index--;

        $this->data[$this->index] = $element;

        return true;
    }

    /**
     * @inheritDoc
     */
    public function addLast($element): bool
    {
        return $this->add($element);
    }

    /**
     * @inheritDoc
     */
    public function offerFirst($element): bool
    {
        try {
            return $this->addFirst($element);
        } catch (InvalidArgumentException $e) {
            return false;
        }
    }

    /**
     * @inheritDoc
     */
    public function offerLast($element): bool
    {
        return $this->offer($element);
    }

    /**
     * @inheritDoc
     */
    public function removeFirst()
    {
        return $this->remove();
    }

    /**
     * @inheritDoc
     */
    public function removeLast()
    {
        $tail = $this->pollLast();

        if ($tail === null) {
            throw new NoSuchElementException('Can\'t return element from Queue. Queue is empty.');
        }

        return $tail;
    }

    /**
     * @inheritDoc
     */
    public function pollFirst()
    {
        return $this->poll();
    }

    /**
     * @inheritDoc
     */
    public function pollLast()
    {
        if ($this->count() === 0) {
            return null;
        }

        $tail = $this[$this->tail];

        unset($this[$this->tail]);
        $this->tail--;

        return $tail;
    }

    /**
     * @inheritDoc
     */
    public function firstElement()
    {
        return $this->element();
    }

    /**
     * @inheritDoc
     */
    public function lastElement()
    {
        if ($this->count() === 0) {
            throw new NoSuchElementException('Can\'t return element from Queue. Queue is empty.');
        }

        return $this->data[$this->tail];
    }

    /**
     * @inheritDoc
     */
    public function peekFirst()
    {
        return $this->peek();
    }

    /**
     * @inheritDoc
     */
    public function peekLast()
    {
        if ($this->count() === 0) {
            return null;
        }

        return $this->data[$this->tail];
    }
}

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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"
                        
}