import { Ability, ForbiddenError } from "@casl/ability";
import { PrismaClient, User, UserCreateInput } from '@prisma/client';
import { ValidationError } from "apollo-server-micro";
// import { database as db } from '../../database';

interface serviceContext { ability: Ability };


export const userService = (db: PrismaClient) => ({
  /**
 * Find a user with a given Id
 */
  async fetchUserById(id: User['id'], ctx: serviceContext) {
    const user = await db.user.findOne({ where: { id } });
    if (!!user) {
      ForbiddenError.from(ctx.ability).throwUnlessCan('read', user);
    }

    return user;
  },

  /**
   * Register a new user
   */
  async registerUser(data: UserCreateInput, ctx: serviceContext) {
    const { email } = data;

    ForbiddenError.from(ctx.ability).throwUnlessCan('create', data);

    const existingUser = await db.user.findOne({ where: { email } });
    if (existingUser) {
      throw new ValidationError('Email is already associated with an account');
    }
    return db.user.create({ data });
  }
});