Maintenance window

# title: Maintenance window
# category: Vibescript Showcase
# difficulty: Showcase
# summary: Plan maintenance windows with typed environment enums, freeze notices, and Duration arithmetic.
# description: This example models a real operations workflow where start times, freeze windows, and environment-specific rules need to remain obvious.
# tags: automation, durations, enums, operations
# vibe: 0.2

enum Environment
  Sandbox
  Production
end

def window_length(environment: Environment) -> duration
  if environment == Environment::Sandbox
    20.minutes
  else
    2.hours
  end
end

def freeze_notice(environment: Environment) -> duration
  if environment == Environment::Sandbox
    30.minutes
  else
    24.hours
  end
end

def maintenance_plan(environment: Environment, starts_at: time) -> hash
  length = window_length(environment)
  notice = freeze_notice(environment)

  {
    environment: environment.name,
    starts_at: starts_at.format("2006-01-02T15:04:05Z"),
    ends_at: length.after(starts_at).format("2006-01-02T15:04:05Z"),
    freeze_at: notice.ago(starts_at).format("2006-01-02T15:04:05Z"),
    duration: length.iso8601
  }
end

def run
  starts_at = Time.at(1700600000)

  {
    sandbox: maintenance_plan(Environment::Sandbox, starts_at),
    production: maintenance_plan(Environment::Production, starts_at)
  }
end