salix/modules/supplier/back/methods/supplier/consumption.js

const ParameterizedSQL = require('loopback-connector').ParameterizedSQL;
const buildFilter = require('vn-loopback/util/filter').buildFilter;
const mergeFilters = require('vn-loopback/util/filter').mergeFilters;

module.exports = Self => {
    Self.remoteMethodCtx('consumption', {
        description: 'Find all instances of the model matched by filter from the data source.',
        accessType: 'READ',
        accepts: [
            {
                arg: 'filter',
                type: 'Object',
                description: 'Filter defining where, order, offset, and limit - must be a JSON-encoded string'
            }, {
                arg: 'search',
                type: 'String',
                description: `If it's and integer searchs by id, otherwise it searchs by name`
            }, {
                arg: 'itemId',
                type: 'Number',
                description: 'Item id'
            }, {
                arg: 'categoryId',
                type: 'Number',
                description: 'Category id'
            }, {
                arg: 'typeId',
                type: 'Number',
                description: 'Item type id',
            }, {
                arg: 'buyerId',
                type: 'Number',
                description: 'Buyer id'
            }, {
                arg: 'from',
                type: 'Date',
                description: `The from date filter`
            }, {
                arg: 'to',
                type: 'Date',
                description: `The to date filter`
            }
        ],
        returns: {
            type: ['Object'],
            root: true
        },
        http: {
            path: `/consumption`,
            verb: 'GET'
        }
    });

    Self.consumption = async(ctx, filter) => {
        const conn = Self.dataSource.connector;
        const where = buildFilter(ctx.args, (param, value) => {
            switch (param) {
            case 'search':
                return /^\d+$/.test(value)
                    ? {'i.id': value}
                    : {'i.name': {like: `%${value}%`}};
            case 'itemId':
                return {'i.id': value};
            case 'description':
                return {'i.description': {like: `%${value}%`}};
            case 'categoryId':
                return {'it.categoryFk': value};
            case 'typeId':
                return {'it.id': value};
            case 'buyerId':
                return {'it.workerFk': value};
            case 'from':
                return {'t.shipped': {gte: value}};
            case 'to':
                return {'t.shipped': {lte: value}};
            }
        });

        filter = mergeFilters(filter, {where});
        let stmts = [];
        let stmt;

        stmts.push('DROP TEMPORARY TABLE IF EXISTS tmp.entry');

        stmt = new ParameterizedSQL(
            `CREATE TEMPORARY TABLE tmp.entry
            (INDEX (id))
            ENGINE = MEMORY
                SELECT
                        e.id,
                        e.ref,
                        e.supplierFk,
                        t.shipped
                    FROM vn.entry e
                        JOIN vn.travel t ON t.id = e.travelFk
                        JOIN buy b ON b.id = b.entryFk
                        JOIN item i ON i.id = b.itemFk
                        JOIN itemType it ON it.id = i.typeFk`);
        stmt.merge(conn.makeWhere(filter.where));
        stmt.merge(conn.makeGroupBy('e.id'));
        stmt.merge(conn.makeLimit(filter));
        stmts.push(stmt);

        const entriesIndex = stmts.push('SELECT * FROM tmp.entry') - 1;
        stmt = new ParameterizedSQL(
            `SELECT 
                    b.id AS buyId,
                    b.itemFk,
                    b.entryFk,
                    b.quantity,
                    CAST(b.buyingValue AS DECIMAL(10,2)) AS price,
                    CAST(SUM(b.buyingValue*b.quantity)AS DECIMAL(10,2)) AS total,
                    i.id,
                    i.description,
                    i.name AS itemName,
                    i.subName,
                    i.size AS itemSize,
                    i.typeFk AS itemTypeFk,
                    i.tag5,
                    i.value5,
                    i.tag6,
                    i.value6,
                    i.tag7,
                    i.value7,
                    i.tag8,
                    i.value8,
                    i.tag9,
                    i.value9,
                    i.tag10,
                    i.value10,
                    it.id,
                    it.workerFk,
                    it.categoryFk,
                    it.code AS itemTypeCode
                FROM buy  b
                    JOIN tmp.entry e ON e.id = b.entryFk
                    JOIN item i ON i.id = b.itemFk
                    JOIN itemType it ON it.id = i.typeFk`
        );
        stmt.merge('WHERE b.quantity > 0');
        stmt.merge(conn.makeGroupBy('b.id'));
        stmt.merge(conn.makeOrderBy(filter.order));
        const buysIndex = stmts.push(stmt) - 1;
        stmts.push(`DROP TEMPORARY TABLE tmp.entry`);
        const sql = ParameterizedSQL.join(stmts, ';');

        const result = await conn.executeStmt(sql);

        const entries = result[entriesIndex];
        const buys = result[buysIndex];
        const entriesMap = new Map();

        for (let entry of entries)
            entriesMap.set(entry.id, entry);

        for (let buy of buys) {
            const entry = entriesMap.get(buy.entryFk);

            if (entry) {
                if (!entry.buys) entry.buys = [];

                entry.buys.push(buy);
            }
        }
        return entries;
    };
};