test.js

//Requiring the modules -> It should always be done on the top
const express = require("express");
const ejs = require("ejs"); //View Engine
const path = require("path");

//Creating our server
const app = express();

app.use(express.json());

//Setting Up EJS

app.set("view engine", "ejs");



const PORT = process.env.PORT || 3000;

// GET, POST, PATCH, DELETE

//@GET /
//description: GET request to home page
app.get("/", (req, res) => {
  res.render("index3");
});

app.get('/search', (req, res) => {
  var fs = require("fs");

  var qs = req.query; // sum of two numbers
  qs = qs.question;
  qs=qs.toLowerCase();
  qs = qs.split(" ");
 // console.log(qs);
  var tot = 1020;

  var arr = new Array(1100); // create an empty array of length 2000
  for (var i = 0; i < 1100; i++) {
    arr[i] = new Array(4000); // make each element an array
  }

  var qarr = [4000];
  var mq = 1;

  var iidd = fs.readFileSync("./keywords.txt", "utf8");
  iidd = iidd.toString();
  iidd = iidd.split("\n");

  var idf = fs.readFileSync("./idf.txt", "utf8");
  idf = idf.toString();
  idf = idf.split("\n");

  var tdif = fs.readFileSync("./td-idf.txt", "utf8");
  tdif = tdif.toString();
  tdif = tdif.split("\n");

  var mod = fs.readFileSync("./mod.txt", "utf8");
  mod = mod.toString();
  mod = mod.split("\n");

  var tarr = fs.readFileSync("./problem_titles.txt", "utf8");
  tarr = tarr.toString();
  tarr = tarr.split("\n");

  var uarr = fs.readFileSync("./problem_urls.txt", "utf8");
  uarr = uarr.toString();
  uarr = uarr.split("\n");

  for (var i = 0; i < tdif.length-1; i++) {
    var curr = tdif[i].split(" ");
    var x = parseInt(curr[0]);
    var y = parseInt(curr[1]);
    var val = parseFloat(curr[2]);
    arr[x][y] = val;
  }

  var mp = new Map();
  var w_count = 0;
  var w_ind = new Map();
  for (var i = 0; i < qs.length; i++) {
    var curr = qs[i];
    var idx = iidd.indexOf(curr);
    if (idx != -1) {
      if (mp.has(curr) == false) {
        mp.set(curr, 1);
        qarr[idx] = 1;
        w_ind.set(curr, idx);
      } else {
        mp.set(curr, mp.get(curr) + 1);
        qarr[idx] = qarr[idx] + 1;
      }
      w_count = w_count + 1;
    }
  }

  for (var i = 0; i < qs.length; i++) {
    var curr = qs[i];
    var idx = iidd.indexOf(curr);
    if (idx != -1 && w_ind.get(curr) != -1) {
      var idf_val = parseFloat(idf[idx]);
      qarr[idx] = qarr[idx] / w_count;
      w_ind.set(curr, -1);
    }
  }

  var fin = new Map();
  for (var i = 0; i < tot; i++) {
    var dp = 0;
    var mod_val = parseFloat(mod[i]);
    var qm = 0;
    for (var j = 0; j < qs.length; j++) {
      var curr = qs[j];
      var idx = iidd.indexOf(curr);
      if (idx != -1 && arr[i][idx] != undefined) {
        dp = dp + arr[i][idx] * qarr[idx];
        qm = qm + qarr[idx] * qarr[idx];
      }
    }
    qm = Math.sqrt(qm);
    var ans;
    if (qm != 0 && mod_val != 0) {
      ans = dp / (mod_val * qm);
    }
    if (ans != undefined && ans != 0) {
      var temp = { val1: ans, val2: i + 1 };
      fin.set(i+1,ans);
    }
  }
    fin = new Map([...fin].sort((a, b) => b[1] - a[1]));
    //console.log(fin);
  // function custom_compare(a, b) {
  //   return a.val1 < b.val1;
  // }

  //fin.sort(custom_compare);
  var farr = [];
  // if (fin.length == 0) {
  //   console.log("No results found");
  // } else {
  //   for (var i = 0; i < fin.size; i++) {
  //     if (i == 5) {
  //       break;
  //     }
  //     var temp = fin[i];
  //     var fin_ans = temp.val2;
  //     farr.push(fin_ans);
  //   }
  // }
  var flag=0;
  for (const [key, value] of fin.entries()) {
    var idx = key;
    var bd = fs.readFileSync("./problems/problem" + idx + ".txt", "utf8");
    bd = bd.toString();
    if (flag < 5 && value != 0) {
      let my_object = {
        title: tarr[key],
        url: uarr[key],
        body: bd,
        index: idx,
      };
      flag += 1;
      farr.push(my_object);
    } else {
      break;
    }
  }
  console.log(farr);
  // var obj = [];
  // for (var i = 0; i < farr.length; i++) {
    
    
  //   obj.push({
  //     titles: tarr[farr[i]],
  //     urls: uarr[farr[i]],
  //     body: bd,
  //     index: idx,
  //   });
  // }
  //console.log("Rohit");
 // console.log(obj);
 // var exp = json(obj);
 // console.log(exp);
  res.json(farr);
  
});

// app.get('/page', (req, res) => {
//   var qs=req.params.id;
// });

//Assigning Port to our application
app.listen(PORT, () => {
  console.log("Server is running on port " + PORT);
});