module.exports = Self => {
    Self.remoteMethod('sumAmount', {
        description: 'Returns the sum of greuge for a 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])
            .then(response => {
                callback(null, response.length ? response[0].sumAmount : 0);
            })
            .catch(err => {
                callback(err);
            });
    };
};