# 060: Event Bus
# Central event coordination

# Create event bus for app-wide communication
bus = event_bus()

# Module 1: User authentication
module auth:
  login(email, password):
    # Authenticate user
    user = { email, name: "Alex", id: 123 }
    bus.emit("auth.login", user)

  logout():
    bus.emit("auth.logout")

# Module 2: Analytics
module analytics:
  bus.on("auth.login", (user) => {
    track("user_login", { user_id: user.id })
  })

  bus.on("auth.logout", () => {
    track("user_logout")
  })

  track(event, data):
    show "📊 Analytics: {event} {data}"

# Module 3: UI updates
module ui:
  bus.on("auth.login", (user) => {
    show "Welcome, {user.name}!"
    show_dashboard()
  })

  bus.on("auth.logout", () => {
    show "Goodbye!"
    show_login_screen()
  })

  show_dashboard():
    show "Dashboard loaded"

  show_login_screen():
    show "Login screen loaded"

# Modules don't know about each other
# They only know about events
# This makes the app easy to extend and maintain

# Usage
button "Login" -> auth.login("alex@example.com", "password")
button "Logout" -> auth.logout()