/**
 * Utilitaire pour scanner les fichiers avec ClamAV
 */

import { logger } from './logger.js';

const CLAMAV_API_URL = process.env.CLAMAV_API_URL || 'http://localhost:3023';

/**
 * Scanne un buffer avec ClamAV
 * @param {Buffer} buffer - Le buffer à scanner
 * @param {string} filename - Le nom du fichier (optionnel)
 * @returns {Promise<{clean: boolean, infected: boolean, viruses: string[]}>}
 */
export async function scanBuffer(buffer, filename = 'unknown') {
  try {
    const base64Data = buffer.toString('base64');

    const response = await fetch(`${CLAMAV_API_URL}/api/scan/buffer`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        data: base64Data,
        filename: filename,
      }),
    });

    if (!response.ok) {
      if (response.status === 503) {
        // ClamAV non disponible, on log mais on continue (mode dégradé)
        logger.warn('ClamAV service unavailable, skipping scan', {
          status: response.status,
          filename: filename,
        });
        return { clean: true, infected: false, viruses: [] };
      }

      const error = await response.json().catch(() => ({ message: 'Unknown error' }));
      throw new Error(`ClamAV scan failed: ${error.message || response.statusText}`);
    }

    const result = await response.json();

    if (result.infected) {
      logger.warn('File infected by virus', {
        filename: filename,
        viruses: result.viruses,
      });
    }

    return result;
  } catch (error) {
    // Si ClamAV n'est pas disponible, on log mais on continue (mode dégradé)
    if (error.message.includes('ECONNREFUSED') || error.message.includes('fetch failed')) {
      logger.warn('ClamAV service unavailable, skipping scan', {
        error: error.message,
        filename: filename,
      });
      return { clean: true, infected: false, viruses: [] };
    }

    logger.error('ClamAV scan error', {
      error: error.message,
      filename: filename,
    });
    throw error;
  }
}