var http = require("http");
var url = require("url");
var fs = require("fs");
var db = {};

var handleRequest = function(req, res) {
  res.writeHead(200, {"Content-Type": "text/plain"});
  console.log("Request was made to URL: " + req.url);

  // Get URL params
  var parsedUrl = url.parse(req.url, true);
  var pathname = parsedUrl.pathname;
  var query = parsedUrl.query;
  var key = query.key;
  var resMessage = "Proper URL params: '/set?somekey=somevalue' OR '/get?key=somekey'";

  // Handle routes
  if (pathname === "/set") { // SET sends params to a txt file
    db = Object.assign(db, query);
    fs.writeFile("db.txt", JSON.stringify(db), function() {
      console.log("Database contents:");
      console.log(db);
    });
    resMessage = "You have stored " + JSON.stringify(query) + " in memory.";
    res.end(resMessage);
  } else if (pathname === "/get") { // GET finds params from a txt file
    fs.readFile("db.txt", "utf8", function(err, data) {
      if (err) throw err;
      var value = JSON.parse(data)[key];
      resMessage = "The value of '" + key + "' is: " + value;
      res.end(resMessage);
    });
  } else {
    res.end(resMessage);
  }
}

// Run server
http.createServer(handleRequest).listen(4000, function() {
  console.log("App running on port 4000");
});