forecast_api/index.js

require('dotenv').config();
const express = require('express');
var bodyParser = require('body-parser');
const server = express();
const pg = require('pg');

//---------read sql files into variables----------------
var fs = require('fs');
var readline = require('readline');
//-------------------------------------------------------

var Postgres = new pg.Client({
    user: process.env.user,
    password: process.env.password,
    host: process.env.host,
    port: process.env.port,
    database: process.env.database,
    ssl: false,
    application_name: "osm_api"
});
Postgres.connect();

Postgres.FirstRow = function (inSQL, args, inResponse) {
    Postgres.query(inSQL, args, (err, res) => {
        if (err === null) {
            inResponse.json(res.rows[0]);
            return;
        }
        inResponse.json(err.stack);
    });
};

server.get('/scenario_package', bodyParser.json(), function (req, res) {

    var w = "";
    var c = 1;
    var args = [];

    for (var i in req.body) {
        //console.log(i);
        ///console.log(req.body[i]);
        if (c > 1) {
            w = w +
                `
        AND `
        }
        w = w + i + " = '" + req.body[i] + "'";
        args.push(req.body[i]);
        c = c + 1;
    };
    if (c == 1) {
        res.send("no body was sent");
        return;
    }
    //console.log(w);
    //console.log(args);
    w =
        `
        WITH 
        mseq AS (
            SELECT * FROM 
            (
                VALUES
                ('Jun',1)
                ,('Jul',2)
                ,('Aug',3)
                ,('Sep',4)
                ,('Oct',5)
                ,('Nov',6)
                ,('Dec',7)
                ,('Jan',8)
                ,('Feb',9)
                ,('Mar',10)
                ,('Apr',11)
                ,('May',12)

            ) x(m,s)
        )
        --select * from mseq
        ,base AS (
        SELECT
            order_season
            ,order_month
            ,version
            ,iter
            ,part_descr
            ,bill_cust_descr
            ,ship_cust_descr
            ,SUM(units) units
            ,SUM(value_usd) value_usd
        FROM
            rlarp.osm_fcpool
        WHERE
            `+ w +
        `GROUP BY
        order_season
        ,order_month
        ,version
        ,iter
        ,part_descr
        ,bill_cust_descr
        ,ship_cust_descr
    )
    ,months AS (
        SELECT
            order_season
            ,version
            ,iter
            ,order_month
            ,mseq.s seq
            ,sum(units) units
            ,sum(value_usd) value_usd
        FROM
            base
            INNER JOIN mseq ON
                mseq.m = base.order_month
        GROUP BY
            order_season
            ,version
            ,iter
            ,order_month
            ,s
    )
    ,mpvt AS (
        SELECT
            order_month
            ,seq
            ,SUM(units) FILTER (WHERE order_season = 2019) "2019 qty"
            ,SUM(units) FILTER (WHERE order_season = 2020 AND iter = 'copy') "2020 base qty"
            ,SUM(units) FILTER (WHERE order_season = 2020 AND iter = 'adjustment') "2020 adj qty"
            ,SUM(units) FILTER (WHERE order_season = 2020 AND iter IN ('copy','adjustment')) "2020 tot qty"
            ,SUM(value_usd) FILTER (WHERE order_season = 2019) "2019 value_usd"
            ,SUM(value_usd) FILTER (WHERE order_season = 2020 AND iter = 'copy') "2020 base value_usd"
            ,SUM(value_usd) FILTER (WHERE order_season = 2020 AND iter = 'adjustment') "2020 adj value_usd"
            ,SUM(value_usd) FILTER (WHERE order_season = 2020 AND iter IN ('copy','adjustment')) "2020 tot value_usd"
        FROM
            months
        GROUP BY
            order_month
            ,seq
        ORDER BY
            seq ASC
    )
    ,mlist AS (
        SELECT
            mseq.m order_month
            ,"2019 qty"
            ,"2020 base qty"
            ,"2020 adj qty"
            ,"2020 tot qty"
            ,"2019 value_usd"
            ,"2020 base value_usd"
            ,"2020 adj value_usd"
            ,"2020 tot value_usd"
        FROM
            mseq
            LEFT OUTER JOIN mpvt ON
                mpvt.order_month = mseq.m
        ORDER BY
            mseq.s ASC
    )
    ,totals AS (
        SELECT
            order_season
            ,version
            ,iter
            ,sum(units) units
            ,sum(value_usd) value_usd
        FROM
            months
        GROUP BY
            order_season
            ,version
            ,iter
    )
    SELECT 
        jsonb_build_object(
            'months'
            ,(SELECT jsonb_agg(row_to_json(months)::jsonb) FROM months)
            ,'mpvt'
            ,(SELECT jsonb_agg(row_to_json(mlist)::jsonb) FROM mlist)
            ,'base'
            ,(SELECT jsonb_agg(row_to_json(base)::jsonb) FROM base)
            ,'totals'
            ,(SELECT jsonb_agg(row_to_json(totals)::jsonb) FROM totals)
        ) package`
    console.log(w);
    Postgres.FirstRow(w, [], res)
    //res.json("hi")
})

server.get('/get_pool', bodyParser.json(), function (req, res) {

    var args = [req.body.quota_rep];
    //------------------------------------------set base SQL------------------------------------
    var w =
        `
    WITH rows AS (
        SELECT
            ---------customer info-----------------
            bill_cust_descr
            ,billto_group
            ,ship_cust_descr
            ,shipto_group
            ,quota_rep_descr
            ,director_descr
            ,segm
            ,mod_chan
            ,mod_chansub
            ---------product info------------------
            ,majg_descr
            ,ming_descr
            ,majs_descr
            ,mins_descr
            ,brand
            ,part_family
            ,part_group
            ,branding
            ,color
            ,part_descr
            ---------dates-------------------------
            ,order_season
            ,order_month
            ,ship_season
            ,ship_month
            ,request_season
            ,request_month
            ,promo
            ,version
            ,iter
            --------values-------------------------
            ,sum(value_loc) value_loc
            ,sum(value_usd) value_usd
            ,sum(cost_loc) cost_loc
            ,sum(cost_usd) cost_usd
            ,sum(units) units
        FROM
            rlarp.osm_fcpool
        WHERE
            quota_rep_descr = $1
        GROUP BY
                ---------customer info-----------------
            bill_cust_descr
            ,billto_group
            ,ship_cust_descr
            ,shipto_group
            ,quota_rep_descr
            ,director_descr
            ,segm
            ,mod_chan
            ,mod_chansub
            ---------product info------------------
            ,majg_descr
            ,ming_descr
            ,majs_descr
            ,mins_descr
            ,brand
            ,part_family
            ,part_group
            ,branding
            ,color
            ,part_descr
            ---------dates-------------------------
            ,order_season
            ,order_month
            ,ship_season
            ,ship_month
            ,request_season
            ,request_month
            ,promo
            ,version
            ,iter
        )
        SELECT
            json_agg(row_to_json(rows)) x
        FROM
            rows`;
    //-----------------replace default quota_rep----------------------------------------------------
    console.log(w);
    Postgres.FirstRow(w, args, res)
    //res.json("hi")
})

server.get('/', (req, res) => res.send('node.js express is running: 🎉'))


server.get('/test_sql', function(req, res){
    var path = './route_meta/scenario_totals.sql'
    var callback = function(arg){
        res.send(arg)
    };

    fs.readFile(path, 'utf8', function(err, data){
        if (!err){
            callback(data);
        } else {
            callback(err);
        }
    });

});

server.listen(3000, () => console.log('started'))