import 'server-only';
import { ApolloError, gql } from "apollo-server-micro";
import { pageTypeDefs } from "./page";
import { GAME_SYSTEMS } from "@/lib/game";

export const gameTypeDefs = gql`
  ${pageTypeDefs}

  enum GameSystem {
    ${GAME_SYSTEMS.join('\n')}
  }

  type Game {
    id: ID!
    name: String!
    system: GameSystem!
  }

  input GameFilter {
    system: GameSystem
  }

  enum GameOrderBy {
    NAME_ASC
    NAME_DESC
  }
  
  type GameEdge {
    node: Game
    cursor: String
  }

  type GameConnection {
    edges: [GameEdge]
    pageInfo: PageInfo
  }

  type Query {
    game(id: ID!): Game
    games(first: Int!, after: String, orderBy: GameOrderBy, filter: GameFilter): GameConnection
  }
`;

const GAME = {
  id: '0',
  name: 'Pokemon Crystal Version',
  system: 'gbc'
};

export const gameResolvers = {
  Query: {
    game: (_:any, { id }:{ id:string }) => {
      if(!id) throw new ApolloError('Invalid ID');
      
      switch(id) {
        case '0':
          return GAME;

        default:
          return null;
      }
    },

    games: (_: any, { first, after, orderBy, filter }: { first: number, after?: string, orderBy?: string, filter?: { system?: string } }) => {
      if(first > 100) throw new ApolloError('first cannot be greater than 100');
      return {
        edges: [
          { node: GAME }
        ],
        pageInfo: {
          hasNextPage: false,
          hasPreviousPage: false,
          startCursor: '0'
        },
      };
    },
  },
};