let UserError = require('vn-loopback/util/user-error');

module.exports = Self => {
    Self.remoteMethodCtx('updatePrice', {
        description: 'Changes the price of a sale',
        accessType: 'WRITE',
        accepts: [
            {
                arg: 'id',
                description: 'The sale id',
                type: 'number',
                required: true,
                http: {source: 'path'}
            }, {
                arg: 'newPrice',
                description: 'The new price',
                type: 'number',
                required: true
            }
        ],
        returns: {
            type: 'Number',
            root: true
        },
        http: {
            path: `/:id/updatePrice`,
            verb: 'post'
        }
    });

    Self.updatePrice = async(ctx, id, newPrice) => {
        let models = Self.app.models;
        let tx = await Self.beginTransaction({});

        try {
            let options = {transaction: tx};

            let filter = {
                include: {
                    relation: 'ticket',
                    scope: {
                        include: {
                            relation: 'client',
                            scope: {
                                fields: ['salesPersonFk']
                            }
                        },
                        fields: ['id', 'clientFk']
                    }
                }
            };
            let sale = await models.Sale.findById(id, filter, options);

            let isEditable = await models.Ticket.isEditable(ctx, sale.ticketFk);
            if (!isEditable)
                throw new UserError(`The sales of this ticket can't be modified`);

            const userId = ctx.req.accessToken.userId;
            let usesMana = await models.WorkerMana.findOne({where: {workerFk: userId}, fields: 'amount'}, options);
            let componentCode = usesMana ? 'mana' : 'buyerDiscount';

            let discount = await models.Component.findOne({where: {code: componentCode}}, options);
            let componentId = discount.id;
            let componentValue = newPrice - sale.price;

            let where = {
                componentFk: componentId,
                saleFk: id
            };
            let saleComponent = await models.SaleComponent.findOne({where}, options);

            if (saleComponent) {
                await models.SaleComponent.updateAll(where, {
                    value: saleComponent.value + componentValue
                }, options);
            } else {
                await models.SaleComponent.create({
                    saleFk: id,
                    componentFk: componentId,
                    value: componentValue
                }, options);
            }

            await sale.updateAttributes({price: newPrice}, options);

            query = `CALL vn.manaSpellersRequery(?)`;
            await Self.rawSql(query, [userId], options);

            await tx.commit();

            return sale;
        } catch (error) {
            await tx.rollback();
            throw error;
        }
    };
};