/**
 * Bot.php – Telegram Bot API wrapper (PHP 8.4)
 *
 * Ushbu sinf Telegram Bot API bilan oddiy HTTP so‘rovlar orqali
 * o‘zaro aloqani ta'minlaydi. cURL kutubxonasidan foydalanadi va
 * JSON formatidagi natijalarni qaytaradi.
 */
class Bot
{
    private string $token;
    private string $apiBase;

    public function __construct(string $botToken)
    {
        $this->token   = $botToken;
        $this->apiBase = "https://api.telegram.org/bot{$this->token}/";
    }

    /**
     * Telegramga oddiy POST so‘rovi yuboradi.
     */
    private function request(string $method, array $params = []): array
    {
        $url = $this->apiBase . $method;
        $ch  = curl_init($url);
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_POSTFIELDS     => $params,
            CURLOPT_SSL_VERIFYPEER => false,
            CURLOPT_SSL_VERIFYHOST => 0,
        ]);
        $response = curl_exec($ch);
        $err      = curl_error($ch);
        curl_close($ch);
        if ($err) {
            // oddiy log – real loyihada faylga yozish tavsiya etiladi
            error_log('Telegram API error: ' . $err);
            return [];
        }
        return json_decode($response, true) ?? [];
    }

    public function sendMessage(int $chatId, string $text, array $replyMarkup = []): void
    {
        $params = [
            'chat_id' => $chatId,
            'text'    => $text,
            'parse_mode' => 'HTML',
        ];
        if ($replyMarkup) {
            $params['reply_markup'] = json_encode($replyMarkup);
        }
        $this->request('sendMessage', $params);
    }

    public function answerCallbackQuery(string $callbackQueryId, string $text = ''): void
    {
        $params = [
            'callback_query_id' => $callbackQueryId,
        ];
        if ($text) {
            $params['text'] = $text;
        }
        $this->request('answerCallbackQuery', $params);
    }

    public function answerPreCheckoutQuery(string $preCheckoutId, bool $ok, string $errorMessage = ''): void
    {
        $params = [
            'pre_checkout_query_id' => $preCheckoutId,
            'ok' => $ok ? 'true' : 'false',
        ];
        if (!$ok && $errorMessage) {
            $params['error_message'] = $errorMessage;
        }
        $this->request('answerPreCheckoutQuery', $params);
    }

    /**
     * Telegram Payments uchun invoiceni yaratadi.
     */
    public function sendInvoice(int $chatId, int $priceUzs, string $payload, string $title = 'Ovoz berish', string $description = 'Open Budget loyihasiga ovoz berish')
    {
        // Telegramga to‘lov valyutasi – UZS emas, lekin biz “UZS” ni kamroq ishlatamiz.
        // Realda USD/EUR kerak bo‘ladi, lekin soddalashtirish maqsadida.
        $prices = [
            [
                'label' => $title,
                'amount' => $priceUzs * 100, // Telegram smallest currency unit, so‘mda 100
            ],
        ];
        $params = [
            'chat_id'           => $chatId,
            'title'             => $title,
            'description'       => $description,
            'payload'           => $payload,
            'provider_token'    => $GLOBALS['uzcard']['merchant_id'], // placeholder – uzcard token
            'currency'          => 'UZS',
            'prices'            => json_encode($prices),
        ];
        $this->request('sendInvoice', $params);
    /**
     * Send a formatted notification with a leading emoji. This standardises all push messages.
     * @param int $chatId Telegram chat ID
     * @param string $message Message body (HTML allowed)
     * @param string $emoji Emoji prefix, default 🔔
     */
    public function sendNotification(int $chatId, string $message, string $emoji = "🔔"): void
    {
        $this->sendMessage($chatId, $emoji . ' ' . $message);
    }

    /**
     * Wrapper for sending email notifications (optional, uses PHP mail()).
     * Configured via `config.php['smtp']` if present.
     */
    public function sendEmail(string $to, string $subject, string $htmlBody): void
    {
        $cfg = require __DIR__ . '/config.php';
        if (empty($cfg['smtp'])) {
            // No SMTP config – ignore silently.
            return;
        }
        $headers = "MIME-Version: 1.0\r\n" .
            "Content-Type: text/html; charset=UTF-8\r\n" .
            "From: {$cfg['smtp']['from_name']} <{$cfg['smtp']['from_email']}>\r\n";
        // In real deployment you would use a proper library (PHPMailer), but for simplicity we call mail().
        @mail($to, $subject, $htmlBody, $headers);
    }
}
?>