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

module.exports = Self => {
    Self.remoteMethodCtx('updateQuantity', {
        description: 'Changes the quantity of a sale',
        accessType: 'WRITE',
        accepts: [{
            arg: 'id',
            type: 'number',
            required: true,
            description: 'sale ID',
            http: {source: 'path'}
        }, {
            arg: 'quantity',
            type: 'number',
            required: true,
            description: 'newQuantity'
        }],
        returns: {
            type: 'string',
            root: true
        },
        http: {
            path: `/:id/updateQuantity`,
            verb: 'post'
        }
    });

    Self.updateQuantity = async(ctx, id, newQuantity) => {
        const $t = ctx.req.__; // $translate
        const models = Self.app.models;

        const canEditSale = await models.Sale.canEdit(ctx, [id]);

        if (!canEditSale)
            throw new UserError(`Sale(s) blocked, please contact production`);

        if (isNaN(newQuantity))
            throw new UserError(`The value should be a number`);

        const filter = {
            include: {
                relation: 'ticket',
                scope: {
                    include: {
                        relation: 'client',
                        scope: {
                            include: {
                                relation: 'salesPersonUser',
                                scope: {
                                    fields: ['id', 'name']
                                }
                            }
                        }
                    }
                }
            }
        };

        const sale = await models.Sale.findById(id, filter);

        if (newQuantity > sale.quantity)
            throw new UserError('The new quantity should be smaller than the old one');

        const oldQuantity = sale.quantity;
        const result = await sale.updateAttributes({quantity: newQuantity});

        const salesPerson = sale.ticket().client().salesPersonUser();
        if (salesPerson) {
            const origin = ctx.req.headers.origin;
            const message = $t('Changed sale quantity', {
                ticketId: sale.ticket().id,
                itemId: sale.itemFk,
                concept: sale.concept,
                oldQuantity: oldQuantity,
                newQuantity: newQuantity,
                ticketUrl: `${origin}/#!/ticket/${sale.ticket().id}/sale`,
                itemUrl: `${origin}/#!/item/${sale.itemFk}/summary`
            });
            await models.Chat.sendCheckingPresence(ctx, salesPerson.id, message);
        }

        return result;
    };
};