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

module.exports = Self => {
    Self.remoteMethod('updatePrice', {
        description: 'Changes the discount of a sale',
        accessType: '',
        accepts: [{
            arg: 'params',
            type: 'object',
            required: true,
            description: 'sale ID, newPrice',
            http: {source: 'body'}
        }],
        returns: {
            type: 'string',
            root: true
        },
        http: {
            path: `/updatePrice`,
            verb: 'post'
        }
    });

    Self.getTicket = async params => {
        let model = Self.app.models;
        let thisTicketIsEditable = await model.Ticket.isEditable(params.ticketFk);

        if (!thisTicketIsEditable)
            throw new UserError(`The sales of this ticket can't be modified`);

        return await model.Ticket.find({
            where: {
                id: params.ticketFk
            },
            include: [{
                relation: 'client',
                scope: {
                    fields: ['salesPersonFk']
                }
            }],
            fields: ['id', 'clientFk']
        });
    };

    Self.updatePrice = async params => {
        if (isNaN(params.price))
            throw new UserError(`The value should be a number`);

        if (!params.price) params.price = 0;

        let model = Self.app.models;

        let ticket = await Self.getTicket(params);
        let usesMana = await model.WorkerMana.findOne({where: {workerFk: ticket[0].client().salesPersonFk}, fields: 'amount'});
        let currentLine = await Self.app.models.Sale.findOne({where: {id: params.id}});

        let componentToUse;
        if (usesMana)
            componentToUse = 37;
        else
            componentToUse = 34;

        let value = (params.price - currentLine.price);

        let query = `INSERT INTO vn.saleComponent(saleFk, componentFk, value)
                        VALUES(?, ?, ?) ON DUPLICATE KEY UPDATE value = value + ?`;

        await Self.rawSql(query, [params.id, componentToUse, value, value]);

        await currentLine.updateAttributes({price: params.price});

        query = `call vn.manaSpellersRequery(?)`;
        await Self.rawSql(query, [ticket[0].client().salesPersonFk]);
    };
};