import fs from 'fs'
import { gql } from 'graphql-tag';
import { join } from 'path';
import { readdirSync, readFileSync } from 'fs';
import { buildSubgraphSchema } from "@apollo/federation";

let typeDefs = '';

const getTypesOfGraphql = (dirname: string, gqlFiles: string[]) => {
  gqlFiles.forEach((file: string) => {
    const path = dirname + "//" + file;

    if (fs.statSync(path).isFile()) {
      typeDefs += readFileSync(path, {
        encoding: 'utf8',
      });
    } else {
      const getFileOfFolder = readdirSync(join(dirname, `${file}`))
      const searchFolder = getFileOfFolder.map((item) => file + '/' + item)
      getTypesOfGraphql(dirname, searchFolder)
    }
  })
}

export const schema = async (dirname: string) => {
  const typeDef = join(dirname + '/graphql', './typedefs')
  getTypesOfGraphql(typeDef, readdirSync(typeDef))
  const { default: resolvers } = await require(join(dirname + '/graphql', './resolvers'))
  return buildSubgraphSchema({
    typeDefs: gql(typeDefs),
    resolvers
  });
}