schema
  @core(feature: "https://specs.apollo.dev/core/v0.1"),
  @core(feature: "https://specs.apollo.dev/join/v0.1")
{
  query: Query
  mutation: Mutation
}

directive @core(feature: String!) repeatable on SCHEMA

directive @join__field(graph: join__Graph, requires: join__FieldSet, provides: join__FieldSet) on FIELD_DEFINITION

directive @join__type(graph: join__Graph!, key: join__FieldSet) repeatable on OBJECT | INTERFACE

directive @join__owner(graph: join__Graph!) on OBJECT | INTERFACE

directive @join__graph(name: String!, url: String!) on ENUM_VALUE

scalar join__FieldSet

enum join__Graph {
  ACCOUNTS @join__graph(name: "accounts" url: "http://localhost:4001")
  INVENTORY @join__graph(name: "inventory" url: "http://localhost:4004")
  PRODUCTS @join__graph(name: "products" url: "http://localhost:4003")
  REVIEWS @join__graph(name: "reviews" url: "http://localhost:4002")
}

type Mutation {
  createProduct(name: String, upc: ID!): Product @join__field(graph: PRODUCTS)
  createReview(body: String, id: ID!, upc: ID!): Review @join__field(graph: REVIEWS)
}

type Product
  @join__owner(graph: PRODUCTS)
  @join__type(graph: PRODUCTS, key: "upc")
  @join__type(graph: INVENTORY, key: "upc")
  @join__type(graph: REVIEWS, key: "upc")
{
  inStock: Boolean @join__field(graph: INVENTORY)
  name: String @join__field(graph: PRODUCTS)
  price: Int @join__field(graph: PRODUCTS)
  reviews: [Review] @join__field(graph: REVIEWS)
  reviewsForAuthor(authorID: ID!): [Review] @join__field(graph: REVIEWS)
  shippingEstimate: Int @join__field(graph: INVENTORY, requires: "price weight")
  upc: String! @join__field(graph: PRODUCTS)
  weight: Int @join__field(graph: PRODUCTS)
}

type Query {
  me: User @join__field(graph: ACCOUNTS)
  topProducts(first: Int = 5): [Product] @join__field(graph: PRODUCTS)
}

type Review
  @join__owner(graph: REVIEWS)
  @join__type(graph: REVIEWS, key: "id")
{
  author: User @join__field(graph: REVIEWS, provides: "username")
  body: String @join__field(graph: REVIEWS)
  id: ID! @join__field(graph: REVIEWS)
  product: Product @join__field(graph: REVIEWS)
}

type User
  @join__owner(graph: ACCOUNTS)
  @join__type(graph: ACCOUNTS, key: "id")
  @join__type(graph: REVIEWS, key: "id")
{
  id: ID! @join__field(graph: ACCOUNTS)
  name: String @join__field(graph: ACCOUNTS)
  reviews: [Review] @join__field(graph: REVIEWS)
  username: String @join__field(graph: ACCOUNTS)
}