server.ts

declare const require;


var express = require('express');
var bodyParser = require('body-parser');
var _ = require('lodash');
import {lessonsData} from './lessons';


var app = express();

app.use(express.static('.'));
app.use(bodyParser.json());
app.use(bodyParser.text());


const lessons = lessonsData;


app.route('/lessons')
  .get((req, res) => {

    var filtered = lessons;

    if (req.query.search) {
      console.log(req.query.search);
      filtered = filtered.filter(
        lesson => lesson.description.indexOf(req.query.search) != - 1);
    }

    res.status(200).json(filtered);
  })
  .post((req, res) => {
    lessons.push(req.body);
    res.status(200).send();
  });

app.route('/lessons/:lessonId')
  .delete((req,res) => {
    const lessonId = req.params.lessonId;
    console.log("deleting lesson ", lessonId);
    const index = _.find(lessons,
      lesson => lesson.id === lessonId
    );
    lessons.splice(index, 1);
    res.status(200).send();
  })
  .get((req, res)=>{
    let filtered = lessons.filter(lesson => lesson.id == req.params.lessonId);
    console.log('the filtered array is:' + filtered);
    res.status(200).json(filtered);
  });

app.route('/flakylessons')
  .get((req, res) => {

    const num = Math.round(Math.random() * 10);

    if (num % 2 == 0) {
      res.status(200).json(lessons);
    }
    else {
      res.status(500).send();
    }

  });




app.route('/delayedlessons')
  .get((req, res) => {

    setTimeout(() => {

      var filtered = lessons;

      if (req.query.search) {
        console.log(req.query.search);
        filtered = filtered.filter(
          lesson => lesson.description.indexOf(req.query.search) != - 1);
      }

      res.status(200).json(filtered);

    }, 1000);

  });


function redirectRouterLessonUnmatched(req,res) {
  res.sendFile("index.html", { root: './' });
}

app.use(redirectRouterLessonUnmatched);


var server = app.listen(8080, function() {
  console.log("Server running at http://localhost:" + server.address().port);
});