export async function fetchSpikeData(filters = {}) {
  const params = new URLSearchParams();
  if (filters.time_range) params.append('time_range', filters.time_range);
  if (filters.event_type) params.append('event_type', filters.event_type);
  if (filters.cpu_id !== undefined && filters.cpu_id !== null) params.append('cpu_id', filters.cpu_id);

  const url = `/api/spike_data${params.toString() ? '?' + params.toString() : ''}`;

  try {
    const response = await fetch(url, { method: 'GET' });
    if (!response.ok) {
      console.error('Fehlerhafte Serverantwort:', response.status, response.statusText);
      return [];
    }
    const data = await response.json();
    if (!Array.isArray(data)) {
      console.error('Unerwartetes Datenformat von /api/spike_data');
      return [];
    }
    return data.map(item => ({
      timestamp: Number(item.timestamp) || 0,
      type: typeof item.type === 'string' ? item.type : '',
      cpu: Number(item.cpu) || 0,
      value: Number(item.value) || 0
    }));
  } catch (err) {
    console.error('Fehler beim Abrufen der Spike-Daten:', err);
    return [];
  }
}