module.exports = (Vehicle) => {
    Vehicle.remoteMethod('activeDrivers', {
        description: 'returns actives employees with driver role',
        accessType: 'READ',
        accepts: [{
            arg: 'filter',
            type: 'Object',
            required: false,
            description: 'Filter defining where and paginated data',
            http: {source: 'query'}
        }],
        returns: {
            arg: 'data',
            type: 'Employee',
            root: true
        },
        http: {
            path: `/activeDrivers`,
            verb: 'get'
        }
    });

    Vehicle.activeDrivers = (filter, callback) => {
        let skip = filter.skip || 0;
        let limit = filter.limit || 10;
        let where = getCondition(filter.where);
        // TODO: change salesPerson role to Driver role when it will be created
        let query = `SELECT  em.id, em.name, em.surname 
                    FROM Employee em 
                    JOIN Account ac ON em.userFk = ac.id
                    JOIN Role ON Role.id = ac.roleFK
                    WHERE ac.active AND Role.\`name\`='salesPerson' ${where}
                    ORDER BY em.name ASC
                    LIMIT ${limit} OFFSET ${skip}`;
       
        Vehicle.rawSql(query, [], callback)
        .then(response => {
            callback(null, formatDriver(response));
        })
        .catch(reject => {
            callback(reject, null);
        });
    };

    function getCondition(where) {
        let out = [];
        if(typeof where === 'object') {
            Object.keys(where).forEach((k) => {
                let value = where[k];
                if (typeof value === 'number') {
                    out.push(`em.${k}=${value}`);
                } else if (typeof value === 'string') {
                    out.push(`em.${k}='${value}'`);
                } else if (typeof value === 'boolean' || value === null) { 
                    out.push(`em.${k} IS ${String(value).toUpperCase()}`);
                } else if (Object.keys(value).length) {
                    let firstProperty = Object.keys(value)[0];
                    out.push(`em.${k} ${firstProperty} '${value[firstProperty]}'`);
                } else {
                    throw new Error ('Error: unexpected type');
                }
            });
        }
        return out.length ? `AND (${out.join(' AND ')})` : '';
    }

    function formatDriver (response) {
        let results = [];

        response.forEach( person => {
            results.push({
                id: person.id,
                name: `${person.name} ${person.surname}`
            });
        });

        return results;
    }
};