{
  "data": {
    "recentReviews": [
      {
        "text": "I had a really long stay in Origae-6 for a work trip. The pod was small, but it had all I needed. Although I was starting to get space-crazy by the last week, I managed to survive.",
        "rating": 4,
        "listing": {
          "title": "The Pod in Origae-6",
          "numOfBeds": 3,
          "costPerNight": 688
        }
      },
    {
        "text": "The COOLEST yurt I've ever been in!!! Check it out, you won't regret it. The force shield is next level, we had a meteor shower come in the last night and besides a few rumbles, you couldn't even tell!",
        "rating": 5,
        "listing": {
          "title": "Cozy yurt in Mraza",
          "numOfBeds": 1,
          "costPerNight": 592
        }
      },
      {
        "text": "Meh, could be better honestly. I was expecting more. The lake was the only good part.",
        "rating": 2,
        "listing": {
          "title": "Repurposed mid century aircraft in Kessail",
          "numOfBeds": 5,
          "costPerNight": 313
        }
      }
    ]
  }
}

extend schema
  @link(url: "https://specs.apollo.dev/federation/v2.7", import: ["@key"])

type Query {
  "A list of the most recent reviews in the database"
  recentReviews: [Review!]!
}

"A comment and a rating submitted by a guest about a particular listing"
type Review {
  id: ID!
  "Comment the author has written"
  text: String!
  "The numerical rating for the review target, on a scale of 1-5, with 5 being excellent."
  rating: Float!
  listing: Listing
}

type Listing @key(fields: "id") {
  id: ID!
  overallRating: Float
  reviews: [Review!]!
}

export const resolvers = {
  Query: {
    recentReviews: async (_, __, { dataSources }) => {
      return dataSources.reviewsDb.getMostRecentReviews();
    },
  },
  Listing: {
    // Exercise: Contributing to an entity
    __resolveReference: (listing) => {
      return listing;
    },
    overallRating: ({ id }, __, { dataSources }) => {
      return dataSources.reviewsDb.getOverallRatingForListing(id);
    },
    reviews: ({ id }, __, { dataSources }) => {
      return dataSources.reviewsDb.getReviewsByListing(id);
    },
    // Exercise: Using requires/external
    moneyValueGuaranteed: (listing, _, { dataSources }) => {
      // Use this function: dataSources.reviewsDb.calculateMoneyValueGuarantee(
      //   listing.costPerNight,
      //   listing.id
      // )
    },
  },
  // Exercise: Reference an entity
  Review: {
    listing: (review) => {
      return { id: review.listingId };
    },
  },
};