module.exports = Self => {
    Self.remoteMethod('sumAmount', {
        description: 'Returns the sum of invoices amount for a client',
        accessType: 'READ',
        accepts: [{
            arg: 'id',
            description: 'The client Id',
            type: 'number',
            required: true,
            http: {source: 'path'}
        }],
        returns: {
            arg: 'sumAmount',
            type: 'number'
        },
        http: {
            path: `/:id/sumAmount`,
            verb: 'GET'
        }
    });

    Self.sumAmount = async id => {
        let query = `SELECT SUM(amount) AS sumAmount FROM vn.invoiceOut WHERE clientFk = ?`;
        let result = await Self.rawSql(query, [id]);
        return result[0].sumAmount;
    };
};