salix/services/loopback/common/methods/ticket/summary.js

module.exports = Self => {
    Self.remoteMethod('summary', {
        description: 'Returns a ticket summary',
        accessType: 'READ',
        accepts: [{
            arg: 'id',
            type: 'number',
            required: true,
            description: 'ticket id',
            http: {source: 'path'}
        }],
        returns: {
            type: [this.modelName],
            root: true
        },
        http: {
            path: `/:id/summary`,
            verb: 'GET'
        }
    });

    Self.summary = async ticketFk => {
        let models = Self.app.models;
        let summaryObj = await getTicketData(Self, ticketFk);
        summaryObj.sales = await getSales(models.Sale, ticketFk);
        summaryObj.subTotal = getSubTotal(summaryObj.sales);
        summaryObj.VAT = await models.Ticket.getVAT(ticketFk);
        summaryObj.total = await models.Ticket.getTotal(ticketFk);

        return summaryObj;
    };

    async function getTicketData(Self, ticketFk) {
        let filter = {
            include: [
                {relation: 'warehouse', scope: {fields: ['name']}},
                {relation: 'agencyMode', scope: {fields: ['name']}},
                {
                    relation: 'client',
                    scope: {
                        fields: ['salesPersonFk', 'name'],
                        include: {
                            relation: 'salesPerson',
                            fields: ['firstName', 'name']
                        }
                    }
                },
                {relation: 'address', scope: {fields: ['street', 'phone']}},
                {
                    relation: 'notes',
                    scope: {
                        fields: ['id', 'observationTypeFk', 'description'],
                        include: {
                            relation: 'observationType',
                            fields: ['description']
                        }
                    }
                },
                {
                    relation: 'tracking',
                    scope: {
                        fields: ['stateFk'],
                        include: {
                            relation: 'state',
                            fields: ['name']
                        }
                    }
                }
            ],
            where: {id: ticketFk}
        };

        return await Self.findOne(filter);
    }

    async function getSales(Sale, ticketFk) {
        let filter = {
            where: {
                ticketFk: ticketFk
            },
            order: 'itemFk ASC',
            include: [{
                relation: 'item',
                scope: {
                    include: {
                        relation: 'tags',
                        scope: {
                            fields: ['tagFk', 'value'],
                            include: {
                                relation: 'tag',
                                scope: {
                                    fields: ['name']
                                }
                            },
                            limit: 6
                        }
                    },
                    fields: ['itemFk', 'name']
                }
            }]
        };

        return await Sale.find(filter);
    }

    function getSubTotal(sales) {
        let subTotal = 0.00;

        sales.forEach(sale => {
            subTotal += sale.quantity * sale.price;
        });

        return subTotal;
    }
};