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

module.exports = Self => {
    Self.remoteMethodCtx('addSale', {
        description: 'Inserts a new sale for the current ticket',
        accessType: 'WRITE',
        accepts: [{
            arg: 'id',
            type: 'number',
            required: true,
            description: 'The ticket id',
            http: {source: 'path'}
        },
        {
            arg: 'itemId',
            type: 'number',
            required: true
        },
        {
            arg: 'quantity',
            type: 'number',
            required: true
        }],
        returns: {
            type: 'object',
            root: true
        },
        http: {
            path: `/:id/addSale`,
            verb: 'POST'
        }
    });

    Self.addSale = async(ctx, id, itemId, quantity, options) => {
        const $t = ctx.req.__; // $translate
        const models = Self.app.models;
        const myOptions = {};
        let tx;

        if (typeof options == 'object')
            Object.assign(myOptions, options);

        if (!myOptions.transaction) {
            tx = await Self.beginTransaction({});
            myOptions.transaction = tx;
        }

        try {
            const isEditable = await models.Ticket.isEditable(ctx, id, myOptions);
            if (!isEditable)
                throw new UserError(`The sales of this ticket can't be modified`);

            const item = await models.Item.findById(itemId, null, myOptions);
            const ticket = await models.Ticket.findById(id, {
                include: {
                    relation: 'client',
                    scope: {
                        include: {
                            relation: 'salesPersonUser',
                            scope: {
                                fields: ['id', 'name']
                            }
                        }
                    }
                }
            }, myOptions);

            const itemInfo = await models.Item.getVisibleAvailable(
                itemId,
                ticket.warehouseFk,
                ticket.shipped,
                myOptions
            );

            const isPackaging = item.family == 'EMB';
            if (!isPackaging && itemInfo.available < quantity)
                throw new UserError(`This item is not available`);

            const newSale = await models.Sale.create({
                ticketFk: id,
                itemFk: item.id,
                concept: item.name,
                quantity: quantity
            }, myOptions);

            await Self.rawSql('CALL vn.sale_calculateComponent(?, NULL)', [newSale.id], myOptions);
            await Self.rawSql('CALL vn.ticket_recalc(?)', [id], myOptions);

            const sale = await models.Sale.findById(newSale.id, {
                include: {
                    relation: 'item'
                }
            }, myOptions);

            const addition = `\r\n-${sale.itemFk}: ${sale.concept} (${sale.quantity})`;

            const salesPerson = ticket.client().salesPersonUser();
            if (salesPerson) {
                const origin = ctx.req.headers.origin;

                const message = $t('Added sale to ticket', {
                    ticketId: id,
                    ticketUrl: `${origin}/#!/ticket/${id}/sale`,
                    addition: addition
                });
                await models.Chat.sendCheckingPresence(ctx, salesPerson.id, message);
            }

            if (tx) await tx.commit();

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