<?php
declare(strict_types=1);

class Api
{
    private string $api_url;
    private string $api_key;
    private int $timeout = 25;

    public function __construct()
    {
        $this->api_url = getenv('SMM_API_URL');
        $this->api_key = getenv('SMM_API_KEY');

        if (!$this->api_url || !$this->api_key) {
            throw new Exception('API configuration missing');
        }
    }

    /* ================= SERVICES ================= */

    public function services(): array
    {
        return $this->request(['action' => 'services']);
    }

    public function balance(): array
    {
        return $this->request(['action' => 'balance']);
    }

    /* ================= ORDER ================= */

    public function order(array $data): array
    {
        $this->validateOrder($data);
        return $this->request(array_merge(['action' => 'add'], $data));
    }

    public function status(int $orderId): array
    {
        return $this->request([
            'action' => 'status',
            'order'  => $orderId
        ]);
    }

    public function multiStatus(array $orderIds): array
    {
        return $this->request([
            'action' => 'status',
            'orders' => implode(',', array_map('intval', $orderIds))
        ]);
    }

    public function cancel(array $orderIds): array
    {
        return $this->request([
            'action' => 'cancel',
            'orders' => implode(',', array_map('intval', $orderIds))
        ]);
    }

    /* ================= REFILL ================= */

    public function refill(int $orderId): array
    {
        return $this->request([
            'action' => 'refill',
            'order'  => $orderId
        ]);
    }

    public function multiRefill(array $orderIds): array
    {
        return $this->request([
            'action' => 'refill',
            'orders' => implode(',', array_map('intval', $orderIds))
        ]);
    }

    public function refillStatus(int $refillId): array
    {
        return $this->request([
            'action' => 'refill_status',
            'refill' => $refillId
        ]);
    }

    public function multiRefillStatus(array $refillIds): array
    {
        return $this->request([
            'action' => 'refill_status',
            'refills' => implode(',', array_map('intval', $refillIds))
        ]);
    }

    /* ================= CORE REQUEST ================= */

    private function request(array $data): array
    {
        $payload = http_build_query(array_merge([
            'key' => $this->api_key
        ], $data));

        $ch = curl_init($this->api_url);
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_POST           => true,
            CURLOPT_POSTFIELDS     => $payload,
            CURLOPT_TIMEOUT        => $this->timeout,
            CURLOPT_SSL_VERIFYPEER => true,
            CURLOPT_SSL_VERIFYHOST => 2,
            CURLOPT_HTTPHEADER     => [
                'Accept: application/json',
                'User-Agent: SecureSMMClient/2.0'
            ]
        ]);

        $response = curl_exec($ch);

        if ($response === false) {
            throw new Exception('Curl error: ' . curl_error($ch));
        }

        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        if ($httpCode !== 200) {
            throw new Exception('API HTTP error: ' . $httpCode);
        }

        return json_decode($response, true, 512, JSON_THROW_ON_ERROR);
    }

    /* ================= VALIDATION ================= */

    private function validateOrder(array $data): void
    {
        if (empty($data['service']) || !is_numeric($data['service'])) {
            throw new Exception('Invalid service ID');
        }

        if (!empty($data['quantity'])) {
            $qty = (int)$data['quantity'];
            if ($qty < 1 || $qty > 100000) {
                throw new Exception('Invalid quantity range');
            }
        }

        if (!empty($data['link'])) {
            if (!filter_var($data['link'], FILTER_VALIDATE_URL)) {
                throw new Exception('Invalid link');
            }
        }

        foreach (['comments','usernames','groups','hashtags'] as $field) {
            if (isset($data[$field])) {
                $data[$field] = trim(strip_tags((string)$data[$field]));
            }
        }
    }
}