type Query {
  systems: [System!]!
  system(id: ID): System
}

type System {
  id: ID!
  name: String!
  routes: [Route!]
  route(id: ID): Route
  stops: [Stop!]
  stop(id: ID): Stop
  shuttles: [Shuttle!]
  shuttle(id: ID): Shuttle
}

type Route {
  name: String!
  id: ID!
  system: System!
  orderedStops: [OrderedStop!]
  nextOrderedStop(forStopId: ID): OrderedStop
  shuttles: [Shuttle!]
  polylineCoordinates: [Coordinates!]!
  color: String!
}

type OrderedStop {
  nextStop: OrderedStop
  previousStop: OrderedStop
  route: Route!
  stop: Stop!
}

type Stop {
  id: ID!
  name: String!
  coordinates: Coordinates!
  system: System!
  etas: [ETA!]
  orderedStops: [OrderedStop!]
}

type Coordinates {
  latitude: Float!
  longitude: Float!
}

type ETA {
  stop: Stop!
  shuttle: Shuttle!
  secondsRemaining: Float!
}

type Shuttle {
  name: String!
  id: ID!,
  coordinates: Coordinates!
  route: Route
  system: System
  etas: [ETA!]
  eta(forStopId: ID): ETA
}