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

module.exports = Self => {
    Self.remoteMethodCtx('recalculatePrice', {
        description: 'Calculates the price of sales and its components',
        accessType: 'WRITE',
        accepts: [{
            arg: 'sales',
            description: 'The sales',
            type: ['object'],
            required: true,
            http: {source: 'body'}
        }],
        returns: {
            type: 'number',
            root: true
        },
        http: {
            path: `/recalculatePrice`,
            verb: 'post'
        }
    });

    Self.recalculatePrice = async(ctx, sales, options) => {
        const models = Self.app.models;
        const myOptions = {userId: ctx.req.accessToken.userId};
        let tx;

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

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

        try {
            const salesIds = sales.map(sale => sale.id);

            await models.Sale.canEdit(ctx, salesIds, myOptions);

            const query = `
                DROP TEMPORARY TABLE IF EXISTS tmp.recalculateSales;
                CREATE TEMPORARY TABLE tmp.recalculateSales
                    SELECT s.id
                        FROM sale s
                        WHERE s.id IN (?);
                CALL vn.sale_recalcComponent(null);
                DROP TEMPORARY TABLE tmp.recalculateSales;`;

            const recalculation = await Self.rawSql(query, salesIds, myOptions);

            if (tx) await tx.commit();

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