<?php
class Api
{
    public $api_url = 'https://moxsmm.com/api/v2';
    public $api_key = '';

    public function order($data)
    {
        $post = array_merge(['key' => $this->api_key, 'action' => 'add'], $data);
        return json_decode((string)$this->connect($post));
    }

    public function status($order_id)
    {
        return json_decode($this->connect([
            'key' => $this->api_key, 'action' => 'status', 'order' => $order_id
        ]));
    }

    public function multiStatus($order_ids)
    {
        return json_decode($this->connect([
            'key' => $this->api_key, 'action' => 'status',
            'orders' => implode(",", (array)$order_ids)
        ]));
    }

    public function services()
    {
        return json_decode($this->connect([
            'key' => $this->api_key, 'action' => 'services',
        ]));
    }

    public function refill(int $orderId)
    {
        return json_decode($this->connect([
            'key' => $this->api_key, 'action' => 'refill', 'order' => $orderId,
        ]));
    }

    public function multiRefill(array $orderIds)
    {
        return json_decode($this->connect([
            'key' => $this->api_key, 'action' => 'refill',
            'orders' => implode(',', $orderIds),
        ]), true);
    }

    public function refillStatus(int $refillId)
    {
        return json_decode($this->connect([
            'key' => $this->api_key, 'action' => 'refill_status', 'refill' => $refillId,
        ]));
    }

    public function multiRefillStatus(array $refillIds)
    {
        return json_decode($this->connect([
            'key' => $this->api_key, 'action' => 'refill_status',
            'refills' => implode(',', $refillIds),
        ]), true);
    }

    public function cancel(array $orderIds)
    {
        return json_decode($this->connect([
            'key' => $this->api_key, 'action' => 'cancel',
            'orders' => implode(',', $orderIds),
        ]), true);
    }

    public function balance()
    {
        return json_decode($this->connect([
            'key' => $this->api_key, 'action' => 'balance',
        ]));
    }

    private function connect($post)
    {
        $_post = [];
        if (is_array($post)) {
            foreach ($post as $name => $value) {
                $_post[] = $name . '=' . urlencode($value);
            }
        }
        $ch = curl_init($this->api_url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_HEADER, 0);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        if (is_array($post)) {
            curl_setopt($ch, CURLOPT_POSTFIELDS, join('&', $_post));
        }
        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)');
        $result = curl_exec($ch);
        if (curl_errno($ch) != 0 && empty($result)) {
            $result = false;
        }
        curl_close($ch);
        return $result;
    }
}

// Examples

$api = new Api();
$services = $api->services();
$balance  = $api->balance();

$order = $api->order(['service' => 1, 'link' => 'http://example.com/test', 'quantity' => 100]);
$order = $api->order(['service' => 1, 'link' => 'http://example.com/test', 'comments' => "good\ngreat\n:)"]);
$order = $api->order(['service' => 1, 'link' => 'http://example.com/test']);
$order = $api->order(['service' => 1, 'link' => 'http://example.com/test', 'quantity' => 100, 'username' => 'test']);
$order = $api->order(['service' => 1, 'link' => 'http://example.com/test', 'quantity' => 100, 'answer_number' => '7']);

$status    = $api->status($order->order);
$statuses  = $api->multiStatus([1, 2, 3]);
$refill    = (array) $api->multiRefill([1, 2]);
$refillIds = array_column($refill, 'refill');
if ($refillIds) {
    $refillStatuses = $api->multiRefillStatus($refillIds);
}