import * as api from '../../client/src/api/api';
import Knex from 'knex';

import { sha512 } from 'js-sha512';
import { DBErrorKind, DBError } from '../endpoints/types';

export async function createUser(user: api.User, knex: Knex): Promise<number> {
    return await knex.transaction(async (trx) => {
        try {
            // check if the user already exists
            const newUser = (await trx
                .select('id')
                .from('users')
                .where({ email: user.email }))[0];
            if (newUser) {
                let e: DBError = {
                    name: "DBError",
                    kind: DBErrorKind.ResourceConflict,
                    message: "User with given e-mail already exists.",
                }
                throw e;
            }

            // Create the new user.
            const passwordHash = sha512(user.password);
            const userId = (await trx('users')
                .insert({
                    email: user.email,
                    passwordHash: passwordHash,
                })
                .returning('id') // Needed for Postgres
            )[0];

            return userId;
        } catch (e) {
            trx.rollback();
        }
    })
}