module.exports = Self => {
    Self.remoteMethod('getWasteByItem', {
        description: 'Returns the details of losses by worker and item',
        accessType: 'READ',
        accepts: [
            {
                arg: 'buyer',
                type: 'string',
                required: true,
                description: 'The buyer name'
            },
            {
                arg: 'family',
                type: 'string',
                required: true,
                description: 'The item family name'
            }
        ],
        returns: {
            type: ['object'],
            root: true
        },
        http: {
            path: `/getWasteByItem`,
            verb: 'GET'
        }
    });

    Self.getWasteByItem = async(buyer, family, options) => {
        const myOptions = {};

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

        const date = new Date();
        date.setHours(0, 0, 0, 0);
        const wastes = await Self.rawSql(`
            SELECT *, 100 * dwindle / total AS percentage
            FROM (
                SELECT  buyer,
                        ws.family,
                        ws.itemFk,
                        sum(ws.saleTotal) AS total,
                        sum(ws.saleWaste) AS dwindle
                    FROM bs.waste ws
                    WHERE buyer = ? AND family = ? 
                        AND year = YEAR(TIMESTAMPADD(WEEK,-1, ?))
                        AND week = WEEK(TIMESTAMPADD(WEEK,-1, ?), 1)
                    GROUP BY buyer, itemFk
                ) sub
                ORDER BY family, percentage DESC`, [buyer, family, date, date], myOptions);

        const details = [];

        for (let waste of wastes) {
            const buyerName = waste.buyer;

            let buyerDetail = details.find(waste => {
                return waste.buyer == buyerName;
            });

            if (!buyerDetail) {
                buyerDetail = {
                    buyer: buyerName,
                    family: waste.family,
                    lines: []
                };
                details.push(buyerDetail);
            }

            buyerDetail.lines.push(waste);
        }

        return details;
    };
};