# 079: Offline-First Pattern
# App works without internet, syncs when available

# Always write to local first
save_note(note):
  # Save locally immediately
  notes = load "notes" locally or []
  note.id = generate_id()
  note.synced = false
  notes.append(note)
  store notes locally as "notes"

  show "Note saved"

  # Try to sync in background
  if network.online:
    sync_in_background(note)
  else:
    show "(Will sync when online)"

# Background sync
sync_in_background(note):
  try:
    sync note to cloud
    note.synced = true
    update_note(note)
  catch:
    # Sync failed, will retry later
    queue_for_retry(note)

# Load data (local always available)
load_notes():
  notes = load "notes" locally or []

  # Try to fetch updates from cloud
  if network.online:
    cloud_notes = fetch_from_cloud("notes")
    merged = merge_notes(notes, cloud_notes)
    store merged locally as "notes"
    return merged
  else:
    # Offline - return local data
    return notes

# Indicate sync status
display_notes():
  notes = load_notes()

  for note in notes:
    show note.text
    if note.synced:
      show "✓ Synced"
    else:
      show "⋯ Pending sync"

# Retry pending syncs when back online
on network.online:
  pending = load "sync_queue" locally or []

  for item in pending:
    sync item to cloud
    mark_as_synced(item)

  delete "sync_queue" locally
  show "Synced {pending.length} pending items"

# The app ALWAYS works locally
# Cloud is enhancement, not requirement