enum Role {
  STUDENT
  TEACHER
}

input UserQueryInput {
  email: String
  name: String
  id: ID
  role: Role
  names: [String]
}

type AuthMethod {
  provider: String
  email: String
}

type User {
  id: ID!
  roles: [Role!]
  name: String
  emails: [String!]!
  emailsOrNull: [String!]
  emailsWithNulls: [String]!
  emailsWithNullsOrNull: [String]
  authMethods: [AuthMethod!]!
}

interface Content {
  id: ID!
  name: String!
  parent: Topic
}

union LeafContent = Article | Video

type Article implements Content {
  id: ID!
  name: String!
  parent: Topic!
  text: String!
}

type Video implements Content {
  id: ID!
  name: String!
  parent: Topic!
  duration: Int!
}

type Topic implements Content {
  id: ID!
  name: String!
  parent: Topic
  children: [Content!]!
}

type Query {
  user(query: UserQueryInput): User
  root: Topic!
  randomLeaf: LeafContent!
}