"use strict"

const express = require("express");
const fetch = require("node-fetch");
const redis = require("redis");


const app = express();
const PORT = process.env.PORT || 4000 ;
const PORT_REDIS = process.env.PORT || 6379 ;
const redisClient = redis.createClient(PORT_REDIS);


const set = (key , value) => {
    console.log("Redis Set Method occured!")
    redisClient.set(key , JSON.stringify(value));
}


const get  = (req , res , next) => {
    let key = req.route.path ;
    console.log("Cache Get Function Occured!");
    redisClient.get(key , (error , data) =>{
        if(error) res.status(400).send(error);
        if(data !== null){
            res.status(200).send(JSON.parse(data));
        }else{
            next();
        }
    });
}



app.get("/spacex/launches", get ,(req, res) => {  
    fetch("https://api.spacexdata.com/v3/launches/latest")
      .then(res => res.json())
      .then(json => { 
          set(req.route.path , json);
          res.status(200).send(json) 
        })
      .catch(error => {
        console.error(error);
        res.status(400).send(error);
      });
  });


app.listen(PORT , () => console.log(`Server up and running on ${PORT}`));