module.exports = Self => {
    Self.remoteMethod('sumAmount', {
        description: 'returns sum greuge.ammount from client',
        accessType: 'READ',
        accepts: [{
            arg: 'id',
            type: 'number',
            required: true,
            description: 'clientFk',
            http: {source: 'path'}
        }],
        returns: {
            arg: 'sumAmount'
        },
        http: {
            path: `/:id/sumAmount`,
            verb: 'get'
        }
    });

    Self.sumAmount = (clientFk, callback) => {
        let query = `SELECT sum(amount) as sumAmount FROM vn.greuge WHERE clientFk = ?`;
        Self.rawSql(query, [clientFk], callback).then(response => {
            if (response.length) {
                callback(null, response[0].sumAmount);
            } else {
                callback(null, 0);
            }
        })
        .catch(reject => {
            callback(reject, null);
        });
    };
};