import { Database } from './db'
import { GraphQLError} from 'graphql'
import { VerifyToken } from './auth';

export const ContextBuilder = async ( dbs , extend ) => {
    return ({ req }) => {
        //try to retrieve auth & getUser functions from extend
        const { getUser, error, auth } = extend;

        let user;
        if ( auth && auth == true) {
            // get the user token from the headers
            const token = req.headers.authentication || '';

            // try to retrieve a user with the token
            user = VerifyToken(token);

            // optionally block the user
            // we could also check user roles/permissions here
            if (!user) throw new GraphQLError('you must be logged in to query this schema');
        }
        else {
            
            return {
                user: user || null,
                dbs,
                ...extend,
            }
        }

    }
}

export const StackBuilder = (config, extend = null) => {

    //Load Models
    //const db = new DatabaseStack(config)
    const db = Database(config);
    //Build Context
    const context = ContextBuilder( db , ( extend ? extend : {} ))

    return {
        context,
        db,
    }
}