interface Node {
  id: ID!
}

interface Character implements Node {
  id: ID!
  name: String!
  friends: [Character]
  appearsIn: [Episode]!
}

type Human implements Character & Node {
  id: ID!
  name: String!
  friends: [Character]
  appearsIn: [Episode]!
  starships: [Starship]
  totalCredits: Int
}

type Droid implements Character & Node {
  id: ID!
  name: String!
  friends: [Character]
  appearsIn: [Episode]!
  primaryFunction: String
}

type Starship {
  id: ID!
  name: String!
  length(unit: LengthUnit = METER): Float
}

enum LengthUnit {
  METER
  LIGHT_YEAR
}

enum Episode {
  "Star Wars Episode IV: A New Hope, released in 1977."
  NEWHOPE
  "Star Wars Episode V: The Empire Strikes Back, released in 1980."
  EMPIRE
  "Star Wars Episode VI: Return of the Jedi, released in 1983."
  JEDI
}

"""
The query type, represents all of the entry points into our object graph
"""
type Query {
  """
  Fetches the hero of a specified Star Wars film.
  """
  hero("The name of the film that the hero appears in." episode: Episode): Character
}

type Review {
  episode: Episode
  stars: Int!
  commentary: String
}

input ReviewInput {
  stars: Int!
  commentary: String
}

type Mutation {
  createReview(episode: Episode, review: ReviewInput!): Review
}