/**
 * Device status utilities for determining online/offline state
 */

const ONLINE_THRESHOLD_MS = 5 * 60 * 1000; // 5 minutes

/**
 * Check if a device is considered "online" based on lastSyncAt timestamp
 * A device is online if it has synced within the last 5 minutes
 */
export function isDeviceOnline(lastSyncAt: Date | number | null): boolean {
  if (!lastSyncAt) return false;
  const timestamp =
    typeof lastSyncAt === "number" ? lastSyncAt : lastSyncAt.getTime();
  return Date.now() - timestamp < ONLINE_THRESHOLD_MS;
}

/**
 * Get a human-readable status string for device last seen time
 */
export function getDeviceStatusText(lastSyncAt: Date | number | null): string {
  if (!lastSyncAt) return "Never synced";

  const timestamp =
    typeof lastSyncAt === "number" ? lastSyncAt : lastSyncAt.getTime();
  const diffMs = Date.now() - timestamp;
  const diffMins = Math.floor(diffMs / 60000);

  if (diffMins < 1) return "Just now";
  if (diffMins < 5) return `${diffMins}m ago`;
  if (diffMins < 60) return `${diffMins}m ago`;

  const diffHours = Math.floor(diffMins / 60);
  if (diffHours < 24) return `${diffHours}h ago`;

  const diffDays = Math.floor(diffHours / 24);
  return `${diffDays}d ago`;
}