const express = require("express")
var busboy = require("connect-busboy"); //middleware for form/file upload
var path = require("path");     //used for file path
var fs = require("fs-extra");       //File System - for file manipulation
const app = express()
var redis = require("redis"),
    client = redis.createClient();

client.on("error", function(err) {
  console.log(err);
})

app.use(busboy());
app.use(express.static(path.join(__dirname, "public")));

app.get("/", function (req, res) {
  res.send("Hello World!")
})

app.get("/download/:id", function(req, res) {
  res.sendFile(path.join(__dirname + "/public/download.html"));
});

app.get("/assets/download/:id", function(req, res) {
  
  let id = req.params.id;
  client.hget(id, "filename", function(err, reply) { // maybe some expiration logic too
  if (!reply) {
      res.sendStatus(404);
    } else {
      res.setHeader("Content-Disposition", "attachment; filename=" + reply);
      res.setHeader("Content-Type", "application/octet-stream");
      
      res.download(__dirname + "/static/" + id, reply, function(err) {
        if (!err) {
          client.del(id);
          fs.unlinkSync(__dirname + "/static/" + id);
        }
      });
    }
  })
  
});

app.route("/upload/:id")
    .post(function (req, res, next) {

        var fstream;
        req.pipe(req.busboy);
        req.busboy.on("file", function (fieldname, file, filename) {
            console.log("Uploading: " + filename);

            //Path where image will be uploaded
            fstream = fs.createWriteStream(__dirname + "/static/" + req.params.id);
            file.pipe(fstream);
            fstream.on("close", function () {  
                let id = req.params.id;
                client.hset(id, "filename", filename, redis.print);
                client.hset(id, "expiration", 0, redis.print);
                client.expire(id, 86400000);
                console.log("Upload Finished of " + filename);           
                res.send(id);
            });
        });
    });



app.listen(3000, function () {
  console.log("Portal app listening on port 3000!")
})