'use strict';

let express = require('express');
let app = express();
let mcache = require('memory-cache');
const request = require('superagent');

let cors = require('cors')
app.use(cors())

let cache = (duration) => {
  return (req, res, next) => {

    let key = '__express__' + req.originalUrl || req.url
    let cachedBody = mcache.get(key)
    if (cachedBody) {
      res.send(JSON.parse(cachedBody))
    } else {
      res.sendResponse = res.send
      res.send = (body) => {
        mcache.put(key, body, duration * 1000);
        res.sendResponse(body)

      };
      next();
    }
  }
};


app.get('/get',cache(20), cors(), (req, res) => {
  setTimeout(() => {
    const url = (req.query)?req.query.url:null;
    if (!url){
        res.status(404).send(getResponse(404,"Not Found " +url)) //not found

    }else{
     request.get(url, function (err, response) {
       // res.header("Access-Control-Allow-Origin", "http://localhost:3000");
       res.header("Access-Control-Allow-Headers", "Origin, Content-Type,  Content-Length");
       res.header("Access-Control-Allow-Methods", "GET,  OPTIONS");
       res.header("Access-Control-Allow-Methods", "GET,  OPTIONS");
       res.header("Content-Type","application/json");
          if (!response && err){
            res.status(500).send(getResponse(500,"An error occured for " +url))
            return;
          }

          res.status(response.status).send(response.body);
    })
  }
})
});

app.use((req, res) => {
  res.status(404).send(getResponse(404,"Not Found " +url)); //not found
});

app.listen((process.env.PORT)?process.env.PORT:3000, function () {
  console.log(`Example app listening on port ${process.env.PORT}!`)
});

function getResponse(code, message){
  var response ={};
  response["code"]=code;
  response["message"]=message;
  return response;

}