type Article {
  author: Profile!
  body: String!
  comments(first: Int, after: String): CommentsConnection
  createdAt: String!
  description: String!
  favorited: Boolean!
  favoritesCount: Int!
  slug: String!
  tags: [String],
  title: String!
  updatedAt: String!
}

type ArticleEdge {
  cursor: String!
  node: Article
}

type ArticlesConnection {
  count: Int!
  edges: [ArticleEdge]
  pageInfo: PageInfo!
}

type Comment {
  author: Profile!
  article: Article!
  body: String!
  createdAt: String!
  updatedAt: String!
}

type CommentEdge {
  cursor: String!
  node: Comment
}

type CommentsConnection {
  count: Int!
  edges: [CommentEdge]
  pageInfo: PageInfo!
}

type DeletionStatus {
  success: Boolean!
}

type PageInfo {
  endCursor: String
  hasNextPage: Boolean!
  hasPreviousPage: Boolean!
  startCursor: String
}

type Profile {
  articles(first: Int, after: String): ArticlesConnection
  bio: String!
  comments(first: Int, after: String): CommentsConnection
  favorites(first: Int, after: String): ArticlesConnection
  following: Boolean!
  image: String
  user: User!
}

type User {
  email: String!
  profile: Profile!
  token: String!
  username: String!
}

# Input types.
input ArticleChanges {
  body: String
  description: String
  title: String
}

input ArticleInput {
  body: String!
  description: String!
  tags: [String]
  title: String!
}

input UserChanges {
  bio: String
  email: String
  image: String
  password: String
  username: String
}

# Build the schema.
type Query {
  article(slug: String!): Article
  articles(
    first: Int,
    after: String,
    authoredBy: String
    favoritedBy: String
    withTag: String
  ): ArticlesConnection
  currentUser: User
  feed(first: Int, after: String): ArticlesConnection
  profile(username: String!): Profile
  tags: [String]
}

type Mutation {
  addComment(slug: String!, body: String!): Comment
  authenticate(password: String!, email: String!): User
  createArticle(input: ArticleInput!)
  deleteArticle(slug: String!): DeletionStatus
  deleteComment(id: ID!): DeletionStatus
  favoriteArticle(slug: String!): Article
  followUser(username: String!): Profile
  unfollowUser(username: String!): Profile
  updateArticle(changes: ArticleChanges!): Article
  updateUser(changes: UserChanges!): User
}

schema {
  query: Query
  mutation: Mutation
}