/**
 * Transform points array to GeoJSON FeatureCollection
 * @param {Array} points - Array of point objects from API
 * @returns {Object} GeoJSON FeatureCollection
 */
export function pointsToGeoJSON(points) {
  return {
    type: 'FeatureCollection',
    features: points.map(point => ({
      type: 'Feature',
      geometry: {
        type: 'Point',
        coordinates: [point.longitude, point.latitude]
      },
      properties: {
        id: point.id,
        timestamp: point.timestamp,
        altitude: point.altitude,
        battery: point.battery,
        accuracy: point.accuracy,
        velocity: point.velocity
      }
    }))
  }
}

/**
 * Format timestamp for display
 * @param {number} timestamp - Unix timestamp
 * @returns {string} Formatted date/time
 */
export function formatTimestamp(timestamp) {
  const date = new Date(timestamp * 1000)
  return date.toLocaleString('en-US', {
    year: 'numeric',
    month: 'short',
    day: 'numeric',
    hour: '2-digit',
    minute: '2-digit'
  })
}