price_api/api.ts

import { Application, Router } from 'https://deno.land/x/oak/mod.ts';
import { Client } from "https://deno.land/x/postgres@v0.17.0/mod.ts";

const app = new Application();
const router = new Router();

//---------dotenv info-------------
import { load } from "https://deno.land/std/dotenv/mod.ts";
import { apply_guidance } from './apply_guidance.ts';

const env = await load();
const hostname = env["HOSTNAME"];
const port     = env["PORT"];
const user     = env["USER"];
const password = env["PASSWORD"];
const database = env["DATABASE"];
const app_port = env["APP_PORT"];


// Configure database connection
const client = new Client({
    hostname:hostname 
    ,port:    port     
    ,user:    user     
    ,password:password 
    ,database:database 
    ,applicationName: "pricing guidance"
});

await client.connect();

// Load SQL from file
const query = await Deno.readTextFile("sql/get.pg.sql");
const query_dseg = await Deno.readTextFile("sql/get_dseg.pg.sql");

// exact scenario for existing codes
router.get('/code/:billcode/:shipcode/:partcode/:qty', async (ctx) => {
    const { billcode, shipcode, partcode, qty } = ctx.params;
    const result = await client.queryObject({args: [billcode, shipcode, partcode, qty], text: query} );
    ctx.response.body = apply_guidance(result.rows[0]["doc"]);
});

// specific customres codes but generic style code and data segment to accomodate custom colors and branding
router.get('/dseg/:billcode/:shipcode/:stlc/:dseg/:qty', async (ctx) => {
    const { billcode, shipcode, stlc, dseg, qty } = ctx.params;
    const result = await client.queryObject({args: [billcode, shipcode, stlc, dseg, qty], text: query_dseg} );
    ctx.response.body = apply_guidance(result.rows[0]["doc"]);
});

// specific customres codes but generic style code and data segment to accomodate custom colors and branding
router.get('/dseg_price/:billcode/:shipcode/:stlc/:dseg/:qty', async (ctx) => {
    const { billcode, shipcode, stlc, dseg, qty } = ctx.params;
    const result = await client.queryObject({args: [billcode, shipcode, stlc, dseg, qty], text: query_dseg} );
    const ag = apply_guidance(result.rows[0]["doc"]);
    ctx.response.body = ag.guidance.FinalReason;
});

app.use(router.routes());
app.use(router.allowedMethods());

// Start the server
console.log('Server is running on http://usmidsap02:8090');
await app.listen({ port: 8090 });